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Ameren

aee · NYSE Utilities
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Ticker aee
Exchange NYSE
Sector Utilities
Industry Regulated Electric
Employees 5001-10,000
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FY2009 Annual Report · Ameren
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Leading the 
Way to a  
Secure Energy 
Future

2009 Annual Report

Ready for  
tomorrow 

In a challenging environment, we have repositioned our company  
with a bold, new vision:  Ameren is committed to leading the way to  
a secure energy future.  

•   We are dedicated to finding sustainable solutions that meet the  

energy needs of our customers.  

•   We are working to earn an even deeper level of trust from our customers. 

•  We are actively engaging in dialogue on energy issues.  

•  We are building a diverse energy portfolio that includes renewables.  

•  We are working hard to protect the environment we all share.  

•  We are embracing challenges and turning them into opportunities. 

 
Energy Solutions   
Page 2

Community Partnership   
Page 4

Operational Excellence   
Page 6

Building Value for Our Investors 
Page 9

48.4% 
Debt

50.3% 
Equity

Financial Highlights   
Page 14

Energy  
Solutions

Providing customers with secure,  
clean and reliable energy solutions 

Our customers are our future — their satisfaction is key to a  
cycle that is the lifeblood of our business. Making investments  
in our infrastructure helps us improve service, which, in turn,  
leads to higher customer satisfaction. High levels of quality  
service and satisfaction can lead to a more constructive  
regulatory environment and appropriate returns on our invest-
ments. Fair returns are necessary to cost-effectively fund  
future infrastructure investments, continuing the benefit for  
our customers and our investors. At left and below are photos 
reflecting recent transmission system projects, including  
switches that are part of our investment in smart grid diagnostic 
technologies. Company employees are shown strengthening  
our electric delivery systems against storms and replacing  
couplings on tens of thousands of feet of natural gas system  
steel piping. These pages also reflect award-winning energy  
efficiency programs that encourage customers to use energy  
more wisely. Our customers are noticing these initiatives;  
surveys show much-improved satisfaction ratings.

2 | 3

Community 
Partnership

Working with our communities  
to make them better places to live 

Our relationship with our communities is nurtured over decades 
through corporate contributions, employee volunteerism and 
a range of programs like the one shown above — a company-
sponsored performance by The National Theatre for Children 
(NTC). NTC educates children about energy conservation  
and renewable energy. Also shown are photos of Skilled Craft 
Program ambassadors who go into local schools to mentor 
and help educate students. Community partnerships have been 
strengthened over the past several years by purchases from 
diverse suppliers, as reflected here by our growing relationship 
with Centrex Electrical Supply Corporation — an electrical  
equipment supplier. Ameren has more than doubled the amount 
spent with these suppliers in the past three years. Also helping 
the economies of our communities are our strong economic  
development programs, like those that brought system upgrades  
to support Continental Tire Company’s $160 million investment 
in improvements to its Mt. Vernon, IL, facility. Continental Tire 
representatives, shown here, recently announced an additional 
$60 million investment for new machinery. 

4 | 5

Operational
Excellence

Operating our business in a safe,  
reliable, efficient and environmentally  
responsible manner

Keeping our power plants available to supply generation is a core 
Ameren competency. So is environmental stewardship. The Duck 
Creek Plant, shown below, epitomizes this with its highly successful 
2009 installation of a scrubber, which helps us greatly reduce  
emissions. The Coffeen Plant followed Duck Creek with its scrubber 
installations. Our Callaway Nuclear Plant, shown top left, generated 
the most electricity in a single calendar year (2009) since it began 
operating in 1984. In late 2009, we announced an initiative to  
install equipment to evaluate the latest in solar technologies, and 
AmerenUE began receiving energy purchased from a Midwestern 
wind farm. Another reflection of our commitment to low-cost,  
clean energy is the rebuild of our 440-megawatt Taum Sauk 
pumped-storage hydroelectric plant, expected to return to service  
in 2010. This facility can store energy produced by renewable 
sources during non-peak periods for use during peak periods.

6 | 7

Building Value 
for Our Investors

My fellow shareholders,

The dedication of Ameren’s many employees and the loyalty of  

the investors who have stayed with us during a difficult time for the 

economy and our industry have inspired all of us here at Ameren.  

I thank you. In this, my first year as CEO, I have worked with a team  

of talented executives to take important steps to respond to the  

economic challenges of today and to capitalize on the opportunities 

of tomorrow. As a result, we believe we are well-positioned to  

create long-term value for you, our owners.

Ameren’s Executive Leadership Team:  (from left) Scott A. Cisel, Chairman, President and Chief Executive Officer,  
AmerenCILCO, AmerenCIPS and AmerenIP; Daniel F. Cole, Chairman, President and Chief Executive Officer, Ameren Services; 
Andrew M. Serri, President and Chief Executive Officer, Ameren Energy Marketing; Adam C. Heflin, Senior Vice President and 
Chief Nuclear Officer, AmerenUE; Karen C. Foss, Senior Vice President, Communications and Brand Management, Ameren 
Services; Martin J. Lyons, Jr., Senior Vice President and Chief Financial Officer, Ameren Corporation; Charles D. Naslund, 
Chairman, President and Chief Executive Officer, Ameren Energy Resources and Chairman and President, Ameren Energy 
Generating Company; Michael L. Moehn, Senior Vice President, Corporate Planning and Business Risk Management, Ameren 
Services; Steven R. Sullivan, Senior Vice President, General Counsel and Secretary, Ameren Corporation; Warner L. Baxter, 
Chairman, President and Chief Executive Officer, AmerenUE; Richard J. Mark, Senior Vice President, Customer Operations, 
AmerenUE; and Thomas R. Voss, President and Chief Executive Officer, Ameren Corporation.

8 | 9

Strengthening Our Foundation 

During 2009, we continued to proactively  
address the effects of the global economic 
and financial crisis—building on efforts  
begun in 2008. We moved quickly and  
aggressively to maintain and enhance our 
financial strength and liquidity position  
by issuing new long-term debt and equity,  
extending our credit facilities, cutting 
planned spending, eliminating approximately  
300 positions, freezing management salaries, 
and taking the difficult step of reducing  
the dividend. That reduction, while essential, 
was not a step we took lightly. These  
actions enhanced our credit profile and  
established a solid foundation to execute  
our future strategies.

The worldwide economic and financial  
crisis has affected businesses around the 
globe, and we are not immune. We are  
experiencing lower revenues due to a drop 
in demand for electricity, particularly among 
industrial customers, and to lower wholesale 
electricity prices. In addition, the infrastructure 
investments we have made to meet our cus-

tomers’ expectations and higher financing costs 
have resulted in earned returns in our regulated 
businesses that are well below levels authorized 
by our regulators. 

All these factors had an impact on our share 
price, but we are taking necessary and  
prudent steps to build a stronger company.  
The Ameren team is dedicated to generating 
long-term earnings growth and value for  
our shareholders.

As part of that commitment, this past  
summer our utilities in Illinois and Missouri 
filed for higher rates. These requests were 
driven by significant investments in service 
quality and reliability, by higher financing costs 
and by our continued pursuit of fair returns  
on our regulated investments. In Missouri, 
higher net fuel costs accounted for more  
than half of the requested revenue increase. 
Rulings on these requests are expected in  
the second quarter of 2010.

Upon assuming the position of chief execu-
tive officer in May 2009, I immediately began 
a strategic planning initiative to define a bold, 

 
From exploring solar power  
technologies to supporting  
economic development programs 
and building strong reliability, 
Ameren employees are engaged 
in the communities they serve.  
Far left is lineman Rob Nguyen— 
a Vietnamese refugee who 
became a U.S. citizen and an 
AmerenUE employee. At right is 
Ameren Business Development 
Executive, Glenn W. Smallwood, Jr. 
(left) shown here with Continental 
Tire Company Plant Manager, 
Hank Eisenga. Smallwood helped 
facilitate the expansion of Conti-
nental Tire’s Mt. Vernon, IL, plant.  

new vision for Ameren —Leading the Way to 
a Secure Energy Future. That vision is sup-
ported by defined business strategies that 
anticipate the changing energy needs of our 
customers and the changing environment  
in which we operate.

Focusing on Our Vision 

With a solid financial foundation in place,  
your company is now focused on realizing  
its new vision— beginning with an even  
stronger focus on the customer.

Essential to our success is a commitment  
to providing our customers with secure,  
clean and reliable energy solutions. We are 
working to achieve top quartile customer  
satisfaction ratings. To help customers man-
age the impact of rate increases and, at the 
same time, to protect the environment, we  
are promoting more efficient use of energy. 
We offer programs ranging from financial 
assistance for home and business improve-
ments to energy audits and appliance  
rebates. In Illinois, we are able to recover  
the costs of these programs on a timely  

We are taking necessary 
and prudent steps to build 
a stronger company.

basis, while homeowners and businesses 
realize energy savings. In Missouri, a new  
law was passed that could allow shareholders 
to benefit from our investments in energy  
efficiency programs.

In addition, we are deploying smart technolo-
gies across our electrical system to provide 
greater reliability and safety, increase oper-
ating efficiency and offer timely information 
about energy usage to our customers— again, 
to help them better manage their costs.

In both Illinois and Missouri, we are pursuing 
renewable generation projects. In Illinois,  
we purchased more than 700,000 renewable 
energy credits. In Missouri, we are designing 
and building a new facility that will tap landfill 

10 | 11

 
gas to generate enough electricity to power 
10,000 households. Located in the St. Louis 
area, the facility will be one of the nation’s  
largest methane recovery projects. We have 
also purchased 100 megawatts of wind  
power. In addition, we are installing solar 
energy systems at our St. Louis headquarters 
campus and at a location in Illinois. 

Clearly our ability to continue to invest  
in these initiatives relies upon rate case  
outcomes that provide necessary cash  
flows on a timely basis.  

Our higher customer satisfaction ratings are 
evidence that our ongoing investment in 
energy efficiency programs, renewable power, 
delivery system reliability and responsive  
service is paying off. We believe strong  
customer satisfaction can contribute to a 
more positive environment that could lead 
to constructive regulatory decisions and an 
ability to earn returns that are closer to levels 
authorized by our regulators.

Your company is strategi-
cally poised to benefit from 
an economic recovery,  
improved regulatory  
returns and significant  
investment opportunities.

for our generating units, where we installed 
environmental controls to vastly reduce  
emissions from our power plants.

Building Value for Shareholders 

Our new vision and supporting initiatives are 
intended to build value for you, our owners.  
We are committed to making disciplined invest-
ments and enhancing the regulatory and  
market framework to support our long-term  
earnings growth.

On the merchant generation side of our  
business, the year also marked milestones  

While we remain committed to growing earnings  
in our utility operations, current returns on our 

 
Ameren’s community relations 
coordinators like Stacey Young 
(at right) reach out to customers 
through speaking engagements 
and workshops on topics ranging 
from the Ameren Illinois Utilities’ 
energy efficiency programs to 
safety. Also supporting our safety 
messages is Ameren’s Safety 
Spokesbug, Louie the Lighting 
Bug (far left), who reached almost 
34,000 children in 2009.  

regulated investments are unacceptably low.  
Our rate cases in both states are designed to  
improve those returns. We know this is a tough 
time to raise utility rates, but even if we are 
granted the full amounts we have requested,  
customer rates would still remain below the  
national average.

In our merchant generation business, our plants 
are highly competitive and well-positioned in their 
market. As the economy recovers, we believe  
demand for power will rise, lifting power prices 
and sustaining the profitability of this business.  
In the meantime, we are focused on maintaining 
a low-cost structure and reducing the volatility  
of merchant generation segment earnings.

I personally thank you for your continued invest-
ment and trust in Ameren. Your company is 
strategically poised to benefit from an economic 
recovery, improved regulatory returns and  
significant investment opportunities. All of us 
here at Ameren are committed to Leading the 
Way to a Secure Energy Future and delivering 
solid value to you, our owners. 

I also thank our employees for their dedication 
to our vision and strategies and for incorporating 
our values in everything they do.

I invite you to attend this year’s annual share-
holders meeting on April 27 at Powell Symphony 
Hall in St. Louis.

Finally, our deep gratitude goes to Executive 
Chairman Gary Rainwater who retires in 2010  
after more than 30 years of service to our  
company. Gary was the driving force behind  
the creation of Ameren— a company that  
now serves 2.4 million electric and nearly  
one million natural gas customers— more than 
double the customer base of a decade ago.  
His vision and leadership will be missed. His 
decades of service are appreciated.

Thomas R. Voss 
President and Chief Executive Officer 
Ameren Corporation

12 | 13

Financial Highlights

AMEREN CONSOLIDATED  
(In millions, except per share amounts and as noted) 

2009 

  2008 

2007

                            Year Ended December 31,

RESULTS OF OPERATIONS  
Operating revenues  

Operating expenses 

Operating income 

Net income attributable to Ameren Corporation  

COMMON STOCK DATA
Earnings per basic and diluted share   

Dividends per common share 

Dividend yield (year-end) 

Market price per common share (year-end closing) 

Shares outstanding (weighted average) 

Total market value of common shares (year-end) 

Book value per common share  

BALANCE SHEET DATA  
Property and plant, net 

Total assets 

Long-term debt obligations, excluding current maturities 

Capitalization ratios 

  Common equity 

  Preferred stock, not subject to mandatory redemption 

 Debt and preferred stock subject to mandatory redemption, net of cash 

OPERATING DATA
Total electric sales (kilowatthours) 

Native natural gas sales (decatherms in thousands) 

Total generation output (kilowatthours) 

Electric customers 

Natural gas customers 

 $7,090    
 $5,674    
 $1,416    
 $612    

$7,839 

$6,477 

 $1,362 

$605 

 $2.78    
 $1.54    
5.5%   
 $27.95    
220.4   
 $6,635    
 $33.08    

 $17,610    
 $23,790    
 $7,113    

50.3%   
1.3%   
 48.4%   

 104,062    
 107,647    
 76,239    
 2.4   
 0.9   

$2.88 

$2.54 

7.6% 

$33.26 

210.1 

$7,062 

$32.80 

$16,567 

$22,671 

$6,554 

45.9% 

1.3% 

 52.8% 

107,754 

119,712 

80,859 

2.4 

0.9 

$7,562

$6,203

$1,359 

$618

$2.98 

$2.54 

4.7%

$54.21 

207.4

$11,294 

$32.41 

$15,069

$20,752 

$5,689 

48.2%

1.4%

 50.4%

107,486 

107,871 

81,367 

2.4

1.0

  
   
 
 
 
Electrical Generating Capacity 
(Expected for 2010 summer peak)

6,400

megawatts generating 
capacity in Illinois

3,300,000

electric and natural  
gas customers 

Peoria

Springfield

Decatur

10,400

megawatts generating 
capacity in Missouri

St. Louis

Company Headquarters

Subsidiary Headquarters

Electric Service Territory

Electric and Natural Gas 
Service Territory

Ameren companies serve approximately  
2.4 million electric and nearly one million natural 
gas customers over 64,000 square miles in  
Illinois and Missouri. The company’s service  
territory includes a diverse base of residential, 
commercial and large industrial customers in 
both urban and rural areas. In Missouri, we  
operate primarily as a traditional, rate-regulated 
utility with approximately 10,400 megawatts 
of generating capacity. Our Illinois operations 
include rate-regulated electric and natural gas 
transmission and distribution businesses, as  
well as a merchant generation business with  
a capacity of approximately 6,400 megawatts  
of generation. Ameren’s Missouri company,  
AmerenUE, is the largest electric utility in the 
state, while the Illinois operations make  
Ameren’s utility operations the second largest 
electric distributor and one of the largest  
natural gas distributors in that state. 

Residential Rates 
(Cents per kilowatthour at June 2009)

Capitalization  
(December 31, 2009)

U.S. Average

Ameren - Illinois

AmerenUE

11.76¢

10.05 ¢

6.76 ¢

1.3% 
Preferred 
Stock

Commercial Rates 
(Cents per kilowatthour at June 2009)

48.4% 
Debt

50.3% 
Equity

U.S. Average

Ameren - Illinois

AmerenUE

10.25 ¢

9.53 ¢

5.47 ¢

Source: Summer 2009 EEI Typical Bills and Average Rates Report

14 | 15

Ameren Corporation and Subsidiaries Officers and Directors

ExECUTIVE  LEADERSHIP TEAM

Gary L. Rainwater 
Executive Chairman

Thomas R. Voss 
President and  
Chief Executive Officer

Warner L. Baxter* 
Chairman, President and  
Chief Executive Officer,  
AmerenUE

Scott A. Cisel* 
Chairman, President and Chief 
Executive Officer, AmerenCILCO, 
AmerenCIPS and AmerenIP

OTHER OFFICERS

Lynn M. Barnes* 
Vice President, Business Planning 
and Controller, AmerenUE

Jerre E. Birdsong 
Vice President and Treasurer
Mark C. Birk* 
Vice President, 
Power Operations, AmerenUE
Maureen A. Borkowski* 
Vice President, Transmission, 
Ameren Services
S. Mark Brawley* 
Vice President, Internal Audit, 
Ameren Services
Kevin DeGraw* 
Vice President, Corporate  
Project Risk Management,  
Ameren Services
Fadi Diya* 
Vice President, 
Nuclear Operations, AmerenUE
Scott A. Glaeser* 
Vice President, Technical  
Services, AmerenCILCO,  
AmerenCIPS and AmerenIP

BOARD OF DIRECTORS

Stephen F. Brauer 1, 2  
Chairman and Chief 
Executive Officer, Hunter 
Engineering Company

Susan S. Elliott 2, 6 
Chairman and Chief Executive 
Officer, Systems Service 
Enterprises, Inc.

Ellen M. Fitzsimmons 2, 4 
Senior Vice President of Law  
and Public Affairs, General  
Counsel and Corporate  
Secretary, CSX Corporation 

Daniel F. Cole* 
Chairman, President and  
Chief Executive Officer,  
Ameren Services

Charles D. Naslund* 
Chairman, President and Chief 
Executive Officer, Ameren Energy 
Resources; Chairman and  
President, Ameren Energy  
Generating Company

Karen C. Foss* 
Senior Vice President, 
Communications and  
Brand Management,  
Ameren Services

Mary P. Heger* 
Vice President, Information 
Technology and Ameren Services 
Center, Ameren Services
Christopher A. Iselin* 
Vice President, Generation  
Technical Services, 
Ameren Energy Resources
Stephen M. Kidwell* 
Vice President, 
Regulatory Affairs, AmerenUE
Mark C. Lindgren* 
Vice President, Human  
Resources, Ameren Services
Michael L. Menne* 
Vice President, 
Environmental Safety and Health, 
Ameren Services 
Donald M. Mosier* 
Vice President, 
Ameren Energy Marketing
Michael G. Mueller* 
President, Ameren Energy 
Fuels and Services

Adam C. Heflin* 
Senior Vice President and  
Chief Nuclear Officer, 
AmerenUE

Martin J. Lyons, Jr. 
Senior Vice President 
and Chief Financial Officer

Richard J. Mark* 
Senior Vice President, 
Customer Operations,  
AmerenUE

Michael L. Moehn* 
Senior Vice President, Corporate 
Planning and Business Risk  
Management, Ameren Services

Andrew M. Serri* 
President and Chief Executive  
Officer, Ameren Energy Marketing

Steven R. Sullivan 
Senior Vice President, General 
Counsel and Secretary

Robert K. Neff* 
Vice President, Coal Supply 
and Transportation, 
Ameren Energy Fuels and  
Services
Craig D. Nelson* 
Senior Vice President, Regulatory 
Affairs and Financial Services, 
AmerenCILCO, AmerenCIPS  
and AmerenIP
Gregory L. Nelson* 
Vice President and Tax Counsel, 
Ameren Services
Stan E. Ogden* 
Vice President, Customer  
Service and Public Relations, 
AmerenCILCO, AmerenCIPS  
and AmerenIP
Ronald D. Pate* 
Vice President, Regional 
Operations, AmerenCILCO, 
AmerenCIPS and AmerenIP
Joseph M. Power* 
Vice President, Federal 
Legislative and Regulatory 
Affairs, Ameren Services

Cleveland O. Reasoner* 
Vice President, Engineering,  
Callaway Nuclear Plant,  
AmerenUE
David J. Schepers* 
Vice President, Energy 
Delivery Technical Services, 
AmerenUE
Shawn E. Schukar* 
Vice President, Strategic 
Initiatives, Ameren Services
James A. Sobule* 
Vice President and 
Deputy General Counsel, 
Ameren Services 

Bruce A. Steinke 
Vice President and Controller
David N. Wakeman* 
Vice President, Energy Delivery-
Distribution Services, AmerenUE
Dennis W. Weisenborn* 
Vice President, Supply Services, 
Ameren Services
D. Scott Wiseman* 
Vice President, Regulatory Affairs, 
AmerenCILCO, AmerenCIPS  
and AmerenIP

Dr. Gayle P. W. Jackson 5, 6 
President, Energy Global, Inc.

Harvey Saligman 3, 4 
Partner, Cynwyd Investments

1  Member of Finance Committee

2  Member of Audit and Risk Committee

James C. Johnson 3, 4  
Retired Vice President and 
Assistant General Counsel, 
Commercial Airplanes, 
The Boeing Company

Charles W. Mueller 1, 5, 6 
Retired Chairman and 
Chief Executive Officer, 
Ameren Corporation

Douglas R. Oberhelman 2, 4 
Vice Chairman and CEO-Elect, 
Caterpillar Inc.

3   Member of Human Resources  

Committee

4   Member of Nominating and Corporate 

Governance Committee

5  Member of Public Policy Committee

6   Member of Nuclear Oversight 

Committee

7  Lead Director

Patrick T. Stokes 3, 4, 7 
Former Chairman, Anheuser-
Busch Companies, Inc.

Thomas R. Voss 
President and Chief Executive 
Officer, Ameren Corporation

Stephen R. Wilson 2, 6 
President and Chief  
Executive Officer,  
CF Industries Holdings, Inc.

Jack D. Woodard 5, 6 
Retired Executive Vice  
President and Chief Nuclear  
Officer, Southern Nuclear  
Operating Company, Inc.

Walter J. Galvin 1, 3 
Vice Chairman,  
Emerson Electric Co.

Gary L. Rainwater  
Executive Chairman, 
Ameren Corporation

* Officer of an Ameren Corporation subsidiary only

UNITED STATES  
SECURITIES AND EXCHANGE COMMISSION  
Washington, D.C. 20549  

FORM 10-K  

(X)  Annual report pursuant to Section 13 or 15(d) 
of the Securities Exchange Act of 1934 
for the fiscal year ended December 31, 2009 
OR 

(   )    Transition report pursuant to Section 13 or 15(d) 

of the Securities Exchange Act of 1934 
for the transition period from              to             . 

Exact name of registrant as specified in its charter; 
State of Incorporation; 
Address and Telephone Number 

Ameren Corporation 
(Missouri Corporation) 
1901 Chouteau Avenue 
St. Louis, Missouri 63103 
(314) 621-3222 

Union Electric Company 
(Missouri Corporation) 
1901 Chouteau Avenue 
St. Louis, Missouri 63103 
(314) 621-3222 

Central Illinois Public Service Company 
(Illinois Corporation) 
607 East Adams Street 
Springfield, Illinois 62739 
(888) 789-2477 

Ameren Energy Generating Company 
(Illinois Corporation) 
1901 Chouteau Avenue 
St. Louis, Missouri 63103 
(314) 621-3222 

Central Illinois Light Company 
(Illinois Corporation) 
300 Liberty Street 
Peoria, Illinois 61602 
(309) 677-5271 

Illinois Power Company 
(Illinois Corporation) 
370 South Main Street 
Decatur, Illinois 62523 
(217) 424-6600 

Commission 
File Number 

1-14756 

1-2967 

1-3672 

333-56594 

1-2732 

1-3004 

IRS Employer 
Identification No. 

43-1723446 

43-0559760 

37-0211380 

37-1395586 

37-0211050 

37-0344645 

 
  
 
 
 
  
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
Securities Registered Pursuant to Section 12(b) of the Securities Exchange Act of 1934:  

The following securities are registered pursuant to Section 12(b) of the Securities Exchange Act of 1934 and are listed 

on the New York Stock Exchange:  
Registrant  

Title of each class 

Ameren Corporation 

Common Stock, $0.01 par value per share 

Securities Registered Pursuant to Section 12(g) of the Securities Exchange Act of 1934:  
Registrant  

Title of each class 

Union Electric Company 

Central Illinois Public Service Company 

Central Illinois Light Company 

Preferred Stock, cumulative, no par value, 

stated value $100 per share: 
$4.56 Series 
$4.00 Series 

$4.50 Series 
$3.50 Series 

Preferred Stock, cumulative, $100 par value per share: 

6.625% Series 
5.16% Series 
4.92% Series 

4.90% Series 
4.25% Series 
4.00% Series 

Depository Shares, each representing one-fourth of a 

share of 6.625% Preferred Stock, cumulative, 
$100 par value per share 

Preferred Stock, cumulative, $100 par value per share: 

4.50% Series 

Ameren Energy Generating Company and Illinois Power Company do not have securities registered under either 

Section 12(b) or 12(g) of the Securities Exchange Act of 1934.  

Indicate by checkmark if each registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act 

of 1933.  

Ameren Corporation 
Union Electric Company 
Central Illinois Public Service Company 
Ameren Energy Generating Company 
Central Illinois Light Company 
Illinois Power Company 

  Yes    
(X)    
(X)    
  Yes    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    

No  
No  
No  
No  
No  
No  

  (   )  
  (   )  
(X)  
(X)  
(X)  
(X)  

Indicate by checkmark if each registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the 

Securities Exchange Act of 1934.  

Ameren Corporation 
Union Electric Company 
Central Illinois Public Service Company 
Ameren Energy Generating Company 
Central Illinois Light Company 
Illinois Power Company 

  Yes     (   )    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    

No  
No  
No  
No  
No  
No  

(X)  
(X)  
(X)  
(X)  
(X)  
(X)  

Indicate by checkmark whether the registrants: (1) have filed all reports required to be filed by Section 13 or 15(d) of 

the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was 
required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.  
(X)    
(X)    
(X)    
(X)    
(X)    
(X)    

Ameren Corporation 
Union Electric Company 
Central Illinois Public Service Company 
Ameren Energy Generating Company 
Central Illinois Light Company 
Illinois Power Company 

  Yes    
  Yes    
  Yes    
  Yes    
  Yes    
  Yes    

No  
No  
No  
No  
No  
No  

  (   )  
  (   )  
  (   )  
  (   )  
  (   )  
  (    )  

 
  
  
  
 
 
  
  
  
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
  
 
 
 
 
 
 
  
Indicate by checkmark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, 

and will not be contained, to the best of each registrant’s knowledge, in definitive proxy or information statements 
incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  

Ameren Corporation 
Union Electric Company 
Central Illinois Public Service Company 
Ameren Energy Generating Company 
Central Illinois Light Company 
Illinois Power Company 
Indicate by checkmark whether each registrant has submitted electronically and posted on its corporate Web site, if 
any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the 
preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  

(   ) 
(X) 
(X) 
(X) 
(X) 
(X) 

Ameren Corporation 
Union Electric Company 
Central Illinois Public Service Company 
Ameren Energy Generating Company 
Central Illinois Light Company 
Illinois Power Company 
Indicate by checkmark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer 

  Yes    
(X)    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    
  Yes     (   )    

No     (   )  
No     (   )  
No     (   )  
No     (   )  
No     (   )  
No     (   )  

or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting 
company” in Rule 12b-2 of the Securities Exchange Act of 1934.  

Smaller 
Reporting 
Company 
(   ) 
Ameren Corporation 
(   ) 
Union Electric Company 
(   ) 
Central Illinois Public Service Company 
(   ) 
Ameren Energy Generating Company 
(   ) 
Central Illinois Light Company 
Illinois Power Company 
(   ) 
Indicate by checkmark whether each registrant is a shell company (as defined in Rule 12b-2 of the Securities 

Large 
Accelerated 
Filer 
(X) 
(   ) 
(   ) 
(   ) 
(   ) 
(   ) 

Non-
accelerated 
Filer 
(   ) 
(X) 
(X) 
(X) 
(X) 
(X) 

Accelerated 
Filer 
(   ) 
(   ) 
(   ) 
(   ) 
(   ) 
(   ) 

Exchange Act of 1934).  
Ameren Corporation 
Union Electric Company 
Central Illinois Public Service Company 
Ameren Energy Generating Company 
Central Illinois Light Company 
Illinois Power Company 
As of June 30, 2009, Ameren Corporation had 214,228,275 shares of its $0.01 par value common stock outstanding. 
The aggregate market value of these shares of common stock (based upon the closing price of these shares on the New 
York Stock Exchange on that date) held by nonaffiliates was $5,332,141,765. The shares of common stock of the other 
registrants were held by affiliates as of June 30, 2009.  

  Yes     (   )   
  Yes     (   )   
  Yes     (   )   
  Yes     (   )   
  Yes     (   )   
  Yes     (   )   

No    
No    
No    
No    
No    
No    

(X) 
(X) 
(X) 
(X) 
(X) 
(X) 

The number of shares outstanding of each registrant’s classes of common stock as of January 29, 2010, was as follows:  

Ameren Corporation 
Union Electric Company 

Central Illinois Public Service Company 

Ameren Energy Generating Company 

Central Illinois Light Company 

Illinois Power Company 

Common stock, $0.01 par value per share: 237,503,643 
Common stock, $5 par value per share, held by Ameren 
Corporation (parent company of the registrant): 102,123,834 
Common stock, no par value, held by Ameren Corporation (parent 
company of the registrant): 25,452,373 
Common stock, no par value, held by Ameren Energy Resources 
Company, LLC (parent company of the registrant and subsidiary of 
Ameren Corporation): 2,000 
Common stock, no par value, held by CILCORP Inc. (parent 
company of the registrant and subsidiary of Ameren Corporation): 
13,563,871 
Common stock, no par value, held by Ameren Corporation (parent 
company of the registrant): 23,000,000 

 
  
  
  
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
DOCUMENTS INCORPORATED BY REFERENCE  
Portions of the definitive proxy statement of Ameren Corporation and portions of the definitive information statements 

of Union Electric Company, Central Illinois Public Service Company, and Central Illinois Light Company for the 2010 
annual meetings of shareholders are incorporated by reference into Part III of this Form 10-K.  

OMISSION OF CERTAIN INFORMATION  
Ameren Energy Generating Company meets the conditions set forth in General Instruction I(1)(a) and (b) of Form 10-

K and is therefore filing this form with the reduced disclosure format allowed under that General Instruction.  

This combined Form 10-K is separately filed by Ameren Corporation, Union Electric Company, Central Illinois Public 

Service Company, Ameren Energy Generating Company, Central Illinois Light Company, and Illinois Power Company. 
Each registrant hereto is filing on its own behalf all of the information contained in this annual report that relates to such 
registrant. Each registrant hereto is not filing any information that does not relate to such registrant, and therefore makes 
no representation as to any such information.  

 
  
  
TABLE OF CONTENTS  

Page  

GLOSSARY OF TERMS AND ABBREVIATIONS ....................................................................................................................   

Forward-looking Statements .....................................................................................................................................................   

1   

3   

PART I  
Item 1. 

Item 1A. 
Item 1B. 
Item 2. 
Item 3. 
Item 4. 

Business  ............................................................................................................................................................   
4   
General .....................................................................................................................................................   
4   
Business Segments ..................................................................................................................................   
5   
Rates and Regulation................................................................................................................................   
5   
Supply for Electric Power ..........................................................................................................................   
7   
9   
Fuel for Power Generation ........................................................................................................................   
Natural Gas Supply for Distribution ...........................................................................................................    11   
Industry Issues ..........................................................................................................................................    12   
Operating Statistics ...................................................................................................................................    13   
Available Information.................................................................................................................................    15   
Risk Factors .......................................................................................................................................................    15   
Unresolved Staff Comments ..............................................................................................................................    21   
Properties ...........................................................................................................................................................    21   
Legal Proceedings .............................................................................................................................................    23   
Submission of Matters to a Vote of Security Holders .........................................................................................    24   

Executive Officers of the Registrants (Item 401(b) of Regulation S-K)  ..................................................................................    24   

PART II  
Item 5. 

Item 6. 
Item 7. 

Item 7A. 
Item 8. 

Market for Registrants’ Common Equity, Related Stockholder Matters and Issuer Purchases of Equity 
Securities ...............................................................................................................................................................  
Selected Financial Data .........................................................................................................................................  
Management’s Discussion and Analysis of Financial Condition and Results of Operations ..................................  
Overview .......................................................................................................................................................  
Results of Operations....................................................................................................................................  
Liquidity and Capital Resources....................................................................................................................  
Outlook ..........................................................................................................................................................  
Regulatory Matters ........................................................................................................................................  
Accounting Matters .......................................................................................................................................  
Effects of Inflation and Changing Prices .......................................................................................................  
Quantitative and Qualitative Disclosures About Market Risk .................................................................................  
Financial Statements and Supplementary Data .....................................................................................................  
Selected Quarterly Information  ....................................................................................................................  
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure  ................................  

  26   
  28   
  29   
  29   
  31   
  49   
  64   
  70   
  70   
  72   
  72   
  78   
  177   
  178   

Item 9. 
Item 9A and 
Item 9A(T).  Controls and Procedures .......................................................................................................................................  
Item 9B. 
Other Information ...................................................................................................................................................  

  178   
  178   

PART III  
Item 10. 
Item 11. 
Item 12. 
Item 13. 
Item 14. 

Directors, Executive Officers and Corporate Governance ..................................................................................    179   
  179   
Executive Compensation ......................................................................................................................................  
  180   
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters ..............  
  180   
Certain Relationships and Related Transactions and Director Independence ......................................................  
  180   
Principal Accountant Fees and Services ...............................................................................................................  

PART IV  
Item 15. 
Exhibits and Financial Statement Schedules  ........................................................................................................  
SIGNATURES .............................................................................................................................................................................  
EXHIBIT INDEX ...........................................................................................................................................................................  

  181   
  185   
  191   

This Form 10-K contains “forward-looking” statements within the meaning of Section 21E of the Securities Exchange Act of 

1934, as amended. Forward-looking statements should be read with the cautionary statements and important factors included 
on pages 3 and 4 of this Form 10-K under the heading “Forward-looking Statements.” Forward-looking statements are all 
statements other than statements of historical fact, including those statements that are identified by the use of the words 
“anticipates,” “estimates,” “expects,” “intends,” “plans,” “predicts,” “projects,” and similar expressions.  

 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
  
  
 
 
 
  
  
GLOSSARY OF TERMS AND ABBREVIATIONS  
We use the words “our,” “we” or “us” with respect to certain information that relates to all Ameren Companies, as defined 

below. When appropriate, subsidiaries of Ameren are named specifically as we discuss their various business activities.  

2007 Illinois Electric Settlement Agreement – A 
comprehensive settlement of issues in Illinois arising out of 
the end of ten years of frozen electric rates, effective 
January 2, 2007. The settlement, which became effective on 
August 28, 2007, was designed to avoid new rate rollback 
and freeze legislation and legislation that would impose a tax 
on electric generation in Illinois. The settlement addressed 
the issue of power procurement, and it included a 
comprehensive rate relief and customer assistance program.  
AERG – AmerenEnergy Resources Generating Company, a 
CILCO subsidiary that operates a merchant electric 
generation business in Illinois.  
AFS – Ameren Energy Fuels and Services Company, a 
Resources Company subsidiary that procures fuel and 
natural gas and manages the related risks for the Ameren 
Companies.  
AITC – Ameren Illinois Transmission Company, an Ameren 
Corporation subsidiary that is engaged in the construction 
and operation of transmission assets in Illinois and is 
regulated by the ICC.  
Ameren – Ameren Corporation and its subsidiaries on a 
consolidated basis. In references to financing activities, 
acquisition activities, or liquidity arrangements, Ameren is 
defined as Ameren Corporation, the parent.  
Ameren Companies – The individual registrants within the 
Ameren consolidated group.  
Ameren Illinois Utilities – CIPS, IP, and the rate-regulated 
electric and natural gas utility operations of CILCO.  
Ameren Services – Ameren Services Company, an Ameren 
Corporation subsidiary that provides support services to 
Ameren and its subsidiaries.  
AMIL – The balancing authority area operated by Ameren, 
which includes the load of the Ameren Illinois Utilities and the 
generating assets of Genco and AERG.  
AMMO – The balancing authority area operated by Ameren, 
which includes the load and generating assets of UE.  
AMT – Alternative minimum tax.  
ARO – Asset retirement obligations.  
Baseload – The minimum amount of electric power delivered 
or required over a given period of time at a steady rate.  
Btu – British thermal unit, a standard unit for measuring the 
quantity of heat energy required to raise the temperature of 
one pound of water by one degree Fahrenheit.  
Capacity factor – A percentage measure that indicates how 
much of an electric power generating unit’s capacity was 
used during a specific period.  
CILCO – Central Illinois Light Company, a CILCORP 
subsidiary that operates a rate-regulated electric 
transmission and distribution business, a merchant electric 
generation business through AERG, and a rate-regulated 
natural gas transmission and distribution business, all in 
Illinois, as AmerenCILCO. CILCO owns all of the common 
stock of AERG.  

CILCORP – CILCORP Inc., an Ameren Corporation 
subsidiary that operates as a holding company for CILCO 
and its merchant generation subsidiary. CILCORP ceased 
filing periodic and current reports with the SEC under the 
Exchange Act as a result of the covenant defeasance of its 
remaining outstanding senior bonds.  
CIPS – Central Illinois Public Service Company, an Ameren 
Corporation subsidiary that operates a rate-regulated electric 
and natural gas transmission and distribution business in 
Illinois as AmerenCIPS.  
CIPSCO – CIPSCO Inc., the former parent of CIPS.  
CO 2 – Carbon dioxide.  
COLA – Combined nuclear plant construction and operating 
license application.  
Cooling degree-days – The summation of positive 
differences between the mean daily temperature and a 65-
degree Fahrenheit base. This statistic is useful for estimating 
electricity demand by residential and commercial customers 
for summer cooling.  
CT – Combustion turbine electric generation equipment used 
primarily for peaking capacity.  
Development Company – Ameren Energy Development 
Company, which was an Ameren Energy Resources 
Company subsidiary and parent of Genco, Marketing 
Company, AFS, and Medina Valley. It was eliminated in an 
internal reorganization in February 2008.  
DOE – Department of Energy, a U.S. government agency.  
DRPlus – Ameren Corporation’s dividend reinvestment and 
direct stock purchase plan.  
Dth (dekatherm) – One million Btus of natural gas.  
EEI – Electric Energy, Inc., an 80%-owned Ameren 
Corporation subsidiary that operates merchant electric 
generation facilities and FERC-regulated transmission 
facilities in Illinois. Prior to February 29, 2008, EEI was 40% 
owned by UE and 40% owned by Development Company. 
On February 29, 2008, UE’s 40% ownership interest and 
Development Company’s 40% ownership interest were 
transferred to Resources Company. The remaining 20% is 
owned by Kentucky Utilities Company, a nonaffiliated entity. 
Effective January 1, 2010, in an internal reorganization, 
Resources Company contributed its 80% ownership interest 
in EEI to its subsidiary, Genco.  
EPA – Environmental Protection Agency, a U.S. government 
agency.  
Equivalent availability factor – A measure that indicates 
the percentage of time an electric power generating unit was 
available for service during a period.  
ERISA – Employee Retirement Income Security Act of 1974, 
as amended.  
Exchange Act – Securities Exchange Act of 1934, as 
amended.  
FAC – A fuel and purchased power cost recovery mechanism 
that allows UE to recover, through customer rates, 95% of 
changes in fuel (coal, coal transportation, natural gas for 
generation, and nuclear) and purchased  

1 

  
 
  
  
power costs, net of off-system revenues, including MISO 
costs and revenues, greater or less than the amount set in 
base rates, without a traditional rate proceeding.  
FASB – Financial Accounting Standards Board, a rulemaking 
organization that establishes financial accounting and 
reporting standards in the United States.  
FERC – The Federal Energy Regulatory Commission, a U.S. 
government agency.  
Fitch – Fitch Ratings, a credit rating agency.  
FTRs – Financial transmission rights, financial instruments 
that entitle the holder to pay or receive compensation for 
certain congestion-related transmission charges between two 
designated points.  
Fuelco – Fuelco LLC, a limited-liability company that 
provides nuclear fuel management and services to its 
members. The members are UE, Luminant, and Pacific Gas 
and Electric Company.  
GAAP – Generally accepted accounting principles in the 
United States of America.  
Genco – Ameren Energy Generating Company, a Resources 
Company subsidiary that operates a merchant electric 
generation business in Illinois and Missouri.  
Gigawatthour – One thousand megawatthours.  
Heating degree-days – The summation of negative 
differences between the mean daily temperature and a 65- 
degree Fahrenheit base. This statistic is useful as an 
indicator of demand for electricity and natural gas for winter 
space heating for residential and commercial customers.  
IBEW – International Brotherhood of Electrical Workers, a 
labor union.  
ICC – Illinois Commerce Commission, a state agency that 
regulates Illinois utility businesses, including the rate-
regulated operations of CIPS, CILCO and IP.  
Illinois Customer Choice Law – Illinois Electric Service 
Customer Choice and Rate Relief Law of 1997, which 
provided for electric utility restructuring and was designed to 
introduce competition into the retail supply of electric energy 
in Illinois.  
Illinois EPA – Illinois Environmental Protection Agency, a 
state government agency.  
Illinois Regulated – A financial reporting segment consisting 
of the regulated electric and natural gas transmission and 
distribution businesses of CIPS, CILCO, IP and AITC.  
IP – Illinois Power Company, an Ameren Corporation 
subsidiary. IP operates a rate-regulated electric and natural 
gas transmission and distribution business in Illinois as 
AmerenIP.  
IP LLC – Illinois Power Securitization Limited Liability 
Company, which was a special-purpose Delaware limited-
liability company. It was dissolved in February 2009 because 
the remaining TFNs, with respect to which this entity was 
created, were redeemed by IP in September 2008.  
IP SPT – Illinois Power Special Purpose Trust, which was 
created as a subsidiary of IP LLC to issue TFNs as allowed 
under the Illinois Customer Choice Law. It was dissolved in 
February 2009 because the remaining TFNs were redeemed 
by IP in September 2008.  

IPA – Illinois Power Agency, a state government agency that 
has broad authority to assist in the procurement of electric 
power for residential and nonresidential customers.  
ISRS – Infrastructure system replacement surcharge. A cost 
recovery mechanism in Missouri that allows UE to recover 
gas infrastructure replacement costs from utility customers 
without a traditional rate case.  
IUOE – International Union of Operating Engineers, a labor 
union.  
Kilowatthour – A measure of electricity consumption 
equivalent to the use of 1,000 watts of power over a period of 
one hour.  
MACT – Maximum Achievable Control Technology.  
Marketing Company – Ameren Energy Marketing Company, 
a Resources Company subsidiary that markets power for 
Genco, AERG, EEI and Medina Valley.  
Medina Valley – AmerenEnergy Medina Valley Cogen LLC, 
a Resources Company subsidiary, which owns a 40-
megawatt gas-fired electric generation plant.  
Megawatthour – One thousand kilowatthours.  
Merchant Generation – A financial reporting segment 
consisting primarily of the operations or activities of Genco, 
the CILCORP parent company, AERG, EEI, Medina Valley, 
and Marketing Company.  
MGP – Manufactured gas plant.  
MISO – Midwest Independent Transmission System 
Operator, Inc., an RTO.  
MISO Energy and Operating Reserves Market – A market 
that uses market-based pricing, incorporating transmission 
congestion and line losses, to compensate market 
participants for power and ancillary services.  
Missouri Environmental Authority – Environmental 
Improvement and Energy Resources Authority of the state of 
Missouri, a governmental body authorized to finance 
environmental projects by issuing tax-exempt bonds and 
notes.  
Missouri Regulated – A financial reporting segment 
consisting of UE’s rate-regulated businesses.  
Mmbtu – One million Btus.  
Money pool – Borrowing agreements among Ameren and its 
subsidiaries to coordinate and provide for certain short-term 
cash and working capital requirements. Separate money 
pools maintained for rate-regulated and non-rate-regulated 
business are referred to as the utility money pool and the 
non-state-regulated subsidiary money pool, respectively.  
Moody’s – Moody’s Investors Service Inc., a credit rating 
agency.  
MoPSC – Missouri Public Service Commission, a state 
agency that regulates Missouri utility businesses, including 
the rate-regulated operations of UE.  
MPS – Multi-Pollutant Standard, an agreement, as amended, 
reached in 2006 among Genco, CILCO (AERG), EEI and the 
Illinois EPA, which was codified in Illinois environmental 
regulations.  
MTM – Mark-to-market.  
MW – Megawatt.  
Native load – Wholesale customers and end-use retail 
customers, whom we are obligated to serve by statute, 
franchise, contract, or other regulatory requirement.  

2 

  
NCF&O – National Congress of Firemen and Oilers, a labor 
union.  
NO x – Nitrogen oxide.  
Noranda – Noranda Aluminum, Inc.  
NPNS – Normal purchases and normal sales.  
NRC – Nuclear Regulatory Commission, a U.S. government 
agency.  
NSR – New Source Review provisions of the Clean Air Act.  
NYMEX – New York Mercantile Exchange.  
NYSE – New York Stock Exchange, Inc.  
OATT – Open Access Transmission Tariff.  
OCI – Other comprehensive income (loss) as defined by 
GAAP.  
Off-system revenues – Revenues from other than native 
load sales.  
OTC – Over-the-counter.  
PGA – Purchased Gas Adjustment tariffs, which allow the 
passing through of the actual cost of natural gas to utility 
customers.  
PJM – PJM Interconnection LLC.  
PUHCA 2005 – The Public Utility Holding Company Act of 
2005, enacted as part of the Energy Policy Act of 2005, 
effective February 8, 2006.  
Regulatory lag – Adjustments to retail electric and natural 
gas rates are based on historic cost and revenue levels. Rate 
increase requests can take up to 11 months to be acted upon 
by the MoPSC and the ICC. As a result, revenue increases 
authorized by regulators will lag behind changing costs and 
revenue.  
Resources Company – Ameren Energy Resources 
Company, LLC, an Ameren Corporation subsidiary that 
consists of non-rate-regulated operations, including Genco, 
Marketing Company, EEI, AFS, and Medina Valley. It is the 
successor to Ameren Energy Resources Company, which 
was eliminated in an internal reorganization in February 
2008.  
RFP – Request for proposal.  
RTO – Regional Transmission Organization.  
S&P – Standard & Poor’s Ratings Services, a credit rating 
agency that is a division of The McGraw-Hill Companies, Inc.  
SEC – Securities and Exchange Commission, a U.S. 
government agency.  
SERC – SERC Reliability Corporation, one of the regional 
electric reliability councils organized for coordinating the 
planning and operation of the nation’s bulk power supply.  
SO 2 – Sulfur dioxide.  
TFN – Transitional Funding Trust Notes issued by IP SPT as 
allowed under the Illinois Customer Choice Law. IP 
designated a portion of cash received from customer billings 
to pay the TFNs. The designated funds received by IP were 
remitted to IP SPT. The designated funds were restricted for 
the sole purpose of making payments of principal and interest 
on, and paying other fees and expenses related to, the TFNs. 
After the implementation of authoritative accounting guidance 
on the consolidation of variable-interest entities, IP did not 
consolidate IP SPT. In September 2008, IP redeemed the 
remaining TFNs.  
TVA – Tennessee Valley Authority, a public power authority.  

3 

UE – Union Electric Company, an Ameren Corporation 
subsidiary that operates a rate-regulated electric generation, 
transmission and distribution business, and a rate-regulated 
natural gas transmission and distribution business in Missouri 
as AmerenUE.  
VIE – Variable-interest entity.  

FORWARD-LOOKING STATEMENTS  

Statements in this report not based on historical facts are 

considered “forward-looking” and, accordingly, involve risks 
and uncertainties that could cause actual results to differ 
materially from those discussed. Although such forward-
looking statements have been made in good faith and are 
based on reasonable assumptions, there is no assurance 
that the expected results will be achieved. These statements 
include (without limitation) statements as to future 
expectations, beliefs, plans, strategies, objectives, events, 
conditions, and financial performance. In connection with the 
“safe harbor” provisions of the Private Securities Litigation 
Reform Act of 1995, we are providing this cautionary 
statement to identify important factors that could cause actual 
results to differ materially from those anticipated. The 
following factors, in addition to those discussed under Risk 
Factors and elsewhere in this report and in our other filings 
with the SEC, could cause actual results to differ materially 
from management expectations suggested in such forward-
looking statements:  
 

regulatory or legislative actions, including changes in 
regulatory policies and ratemaking determinations, such 
as the outcome of pending UE, CIPS, CILCO and IP rate 
proceedings, and future rate proceedings or legislative 
actions that seek to limit or reverse rate increases;  
the effects of, or changes to, the Illinois power 
procurement process;  

 

  changes in laws and other governmental actions, 

including monetary and fiscal policies;  

 

 

  changes in laws or regulations that adversely affect the 
ability of electric distribution companies and other 
purchasers of wholesale electricity to pay their suppliers, 
including UE and Marketing Company;  
the effects of increased competition in the future due to, 
among other things, deregulation of certain aspects of our 
business at both the state and federal levels, and the 
implementation of deregulation, such as occurred when 
the electric rate freeze and power supply contracts 
expired in Illinois at the end of 2006;  
the effects on demand for our services resulting from 
technological advances, including advances in energy 
efficiency and distributed generation sources, which 
generate electricity at the site of consumption;  
increasing capital expenditure and operating expense 
requirements and our ability to recover these costs in a 
timely fashion in light of regulatory lag;  
the effects of participation in the MISO;  
the cost and availability of fuel such as coal, natural gas, 
and enriched uranium used to produce electricity; the cost 
and availability of purchased power and natural  

 
 

 

  
  
gas for distribution; and the level and volatility of future 
market prices for such commodities, including the ability 
to recover the costs for such commodities;  
the effectiveness of our risk management strategies and 
the use of financial and derivative instruments;  

 

  prices for power in the Midwest, including forward prices;  
  business and economic conditions, including their impact 
on interest rates, bad debt expense, and demand for our 
products;  

  disruptions of the capital markets or other events that 
make the Ameren Companies’ access to necessary 
capital, including short-term credit and liquidity, 
impossible, more difficult, or more costly;  

  our assessment of our liquidity;  
 

the impact of the adoption of new accounting guidance 
and the application of appropriate technical accounting 
rules and guidance;  

  actions of credit rating agencies and the effects of such 

 

actions;  
the impact of weather conditions and other natural 
phenomena on us and our customers;  
the impact of system outages;  

 
  generation plant construction, installation and 

 

performance;  
the recovery of costs associated with UE’s Taum Sauk 
pumped-storage hydroelectric plant incident and 
investment in a COLA for a second unit at its Callaway 
nuclear plant;  

 

 

impairments of long-lived assets or goodwill;  

 
  operation of UE’s nuclear power facility, including planned 
and unplanned outages, and decommissioning costs;  
the effects of strategic initiatives, including mergers, 
acquisitions and divestitures;  
the impact of current environmental regulations on utilities 
and power generating companies and the expectation 
that more stringent requirements, including those related 
to greenhouse gases and energy efficiency, will be 
enacted over time, which could limit, or terminate, the 
operation of certain of our generating units, increase our 
costs, reduce our customers’ demand for electricity or 
natural gas, or otherwise have a negative financial effect;  
labor disputes, work force reductions, future wage and 
employee benefits costs, including changes in discount 
rates and returns on benefit plan assets;  
the inability of our counterparties and affiliates to meet 
their obligations with respect to contracts, credit facilities 
and financial instruments;  
the cost and availability of transmission capacity for the 
energy generated by the Ameren Companies’ facilities or 
required to satisfy energy sales made by the Ameren 
Companies;  
legal and administrative proceedings; and  

 
  acts of sabotage, war, terrorism, or intentionally disruptive 

 

 

 

acts.  

Given these uncertainties, undue reliance should not be placed on these forward-looking statements. Except to the 
extent required by the federal securities laws, we undertake no obligation to update or revise publicly any forward-looking 
statements to reflect new information or future events.  

PART I  

ITEM  1.  BUSINESS.  
GENERAL  

Ameren, headquartered in St. Louis, Missouri, is a public 
utility holding company under PUHCA 2005 administered by 
FERC. Ameren was formed in 1997 by the merger of UE and 
CIPSCO. Ameren acquired CILCORP in 2003 and IP in 
2004. Ameren’s primary assets are the common stock of its 
subsidiaries, including UE, CIPS, Genco, CILCO and IP. 
Ameren’s subsidiaries are separate, independent legal 
entities with separate businesses, assets, and liabilities. 
These subsidiaries operate, as the case may be, rate-
regulated electric generation, transmission, and distribution 
businesses, rate-regulated natural gas transmission and 
distribution businesses, and merchant generation businesses 
in Missouri and Illinois. Dividends on Ameren’s common 
stock and the payment of other expenses by Ameren depend 
on distributions made to it by its subsidiaries.  

As part of an internal reorganization, Resources 
Company transferred its 80% ownership interest in EEI to 
Genco, through a capital contribution, on January 1, 2010.  

The following table presents our total employees at 

December 31, 2009:  
Ameren(a)  .....................................................................................................................................................................................  
  9,780 
UE  ...............................................................................................................................................................................................  
  4,425 
CIPS .............................................................................................................................................................................................  
657 
Genco ...........................................................................................................................................................................................  
553 
CILCO ..........................................................................................................................................................................................  
  1,183 
IP   ............................................................................................    1,132 

(a)  Total for Ameren includes Ameren registrant and nonregistrant 

subsidiaries.  
As of January 1, 2010, the IBEW, the IUOE, the NCF&O 

and the Laborers and Gas Fitters labor unions collectively 
represented about 59% of Ameren’s total employees. They 
represented 64% of the employees at UE, 83% at CIPS, 72% 
at Genco, 38% at CILCO, and 90% at IP. All collective 
bargaining agreements that expired in 2009 have been 
renegotiated and ratified. Most of the collective bargaining 
agreements have three- to five-year terms, and expire 
between 2011 and 2013.  

4 

  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
In 2009, Ameren initiated a voluntary separation program 

that provided eligible management employees the 
opportunity to voluntarily terminate their employment and 
receive benefits consistent with Ameren’s standard 
management severance program. This program was offered 
to eligible management employees at Ameren’s subsidiaries, 
including UE, CIPS, Genco, CILCO and IP. Additionally, 
Ameren initiated an involuntary separation program to reduce 
additional management positions under terms and benefits 
consistent with Ameren’s standard management severance 
program. In the third quarter of 2009, Genco announced 
operational changes and staff reductions at three of its 
generating facilities. The affected three plants were the 
Meredosia, Grand Tower, and Hutsonville plants. In addition, 
Genco retired two of the four units at its Meredosia plant. The 
Grand Tower plant will be operated seasonally from May 
through September; a very limited staff will maintain the plant 
during the other months. The number of positions eliminated 
as a result of these separation programs and operational 
changes was approximately 300.  

For additional information about the development of our 

businesses, our business operations, and factors affecting 
our operations and financial position, see Management’s 
Discussion and Analysis of Financial Condition and Results 
of Operations under Part II, Item 7, of this report and Note 1 – 
Summary of Significant Accounting Policies under Part II, 
Item 8, of this report.  

BUSINESS SEGMENTS  

Ameren has three reportable segments: Missouri 
Regulated, Illinois Regulated, and Merchant Generation. 
CILCO has two reportable segments: Illinois Regulated and 
Merchant Generation. See Note 18 – Segment Information 
under Part II, Item 8, of this report for additional information 
on reporting segments.  

RATES AND REGULATION  
Rates  

The rates that UE, CIPS, CILCO and IP are allowed to 

charge for their utility services significantly influence the 
results of operations, financial position, and liquidity of these 
companies and Ameren. The electric and natural gas utility 
industry is highly regulated. The utility rates charged to UE, 
CIPS, CILCO and IP customers are determined, in large part, 
by governmental entities, including the MoPSC, the ICC, and 
FERC. Decisions by these entities are influenced by many 
factors, including the cost of providing service, the prudency 
of expenditures, the quality of service, regulatory staff 
knowledge and experience, economic conditions, public 
policy, and social and political views, and are largely outside 
of our control. Decisions made by these governmental 
entities regarding rates, as well as the regulatory lag involved 
in filing and getting new rates approved, could have a 
material impact on the results of operations, financial 
position, and liquidity of Ameren, UE, CIPS, CILCO and IP.  

The ICC regulates rates and other matters for CIPS, 
CILCO and IP. The MoPSC regulates rates and other matters  
for UE. The FERC regulates UE, CIPS, Genco, CILCO and 
IP as to their ability to charge market-based rates for the sale 
and transmission of energy in interstate commerce and 
various other matters discussed below under General 
Regulatory Matters.  

About 38% of Ameren’s electric and 14% of its gas 
operating revenues were subject to regulation by the MoPSC 
in the year ended December 31, 2009. About 39% of 
Ameren’s electric and 86% of its gas operating revenues 
were subject to regulation by the ICC in the year ended 
December 31, 2009. Wholesale revenues for UE, Genco and 
AERG are subject to FERC regulation, but not subject to 
direct MoPSC or ICC regulation.  

Missouri Regulated  

Electric  

About 83% of UE’s electric operating revenues were 

subject to regulation by the MoPSC in the year ended 
December 31, 2009. Effective March 1, 2009, as a result of a 
MoPSC electric rate order issued in January 2009, UE’s retail 
electric rates include a FAC for billing adjustments for 
changes in prudently incurred fuel and purchased power 
costs.  

FERC regulates the rates charged and the terms and 

conditions for electric transmission services. Each RTO 
separately files regional transmission tariff rates for approval 
by FERC. All members within that RTO are then subjected to 
those rates. As a member of MISO, UE’s transmission rate is 
calculated in accordance with MISO’s rate formula. The 
transmission rate is updated in June of each year based on 
FERC filings. This rate is charged directly to wholesale 
customers. This rate is not directly charged to Missouri retail 
customers because the MoPSC includes transmission-
related costs in setting bundled retail rates in Missouri.  

Natural Gas  

All of UE’s natural gas operating revenues were subject 
to regulation by the MoPSC in the year ended December 31, 
2009.  

If certain criteria are met, UE’s natural gas rates may be 
adjusted without a traditional rate proceeding. PGA clauses 
permit prudently incurred natural gas costs to be passed 
directly to the consumer. The ISRS also permits prudently 
incurred natural gas infrastructure replacement costs to be 
passed directly to the consumer.  

As part of a 2007 stipulation and agreement approved by 
the MoPSC that authorized an increase in annual natural gas 
delivery revenues of $6 million effective April 1, 2007, UE 
agreed not to file a natural gas delivery rate case before 
March 15, 2010. This agreement did not prevent UE from 
filing to recover gas infrastructure replacement costs through 
an ISRS during this three-year rate moratorium. Since April 1, 
2007, the MoPSC has approved three separate requests 
from UE for an ISRS to recover annual revenues of $3 
million, in the aggregate. These surcharges remain in place 
until new rates go into effect.  

5 

  
For additional information on Missouri rate matters, 
including UE’s pending electric rate case and UE’s 2009 
electric rate order, see Results of Operations and Outlook in 
Management’s Discussion and Analysis of Financial 
Condition and Results of Operations under Part II, Item 7, 
Quantitative and Qualitative Disclosures About Market Risk 
under Part II, Item 7A, and Note 2 – Rate and Regulatory 
Matters, and Note 15 – Commitments and Contingencies 
under Part II, Item 8, of this report.  

Illinois Regulated  

The following table presents the approximate percentage 

of electric and natural gas operating revenues subject to 
regulation by the ICC for each of the Illinois Regulated 
companies for the year ended December 31, 2009:  

Electric 
100% 
CIPS ................................................................   
41   
CILCO(a)  ..........................................................   
100   
IP   ..................................................................   
(a)  AERG’s revenues are not subject to ICC regulation.  

Natural Gas 
100% 
100   
100   

Under the Illinois Customer Choice Law, all electric 
customers in Illinois may choose their own electric energy 
provider. However, the Ameren Illinois Utilities are required to 
serve as the provider of last resort (POLR) for electric 
customers within their territory who have not chosen an 
alternative retail electric supplier. The Ameren Illinois Utilities’ 
obligation to provide full requirements electric service, 
including power supply, as a POLR varies by customer size. 
The Ameren Illinois Utilities are not required to offer fixed 
priced electric service to many of their largest customers with 
electric demands of 400 kilowatts or greater, as this group of 
customers has been declared competitive. The power 
procurement costs incurred by the Ameren Illinois Utilities are 
passed directly to their customers through a cost recovery 
mechanism.  

Environmental adjustment rate riders authorized by the 

ICC permit the recovery of prudently incurred MGP 
remediation and litigation costs from CIPS’, CILCO’s and IP’s 
Illinois electric and natural gas utility customers. In addition, 
IP has a tariff rider to recover the costs of asbestos-related 
litigation claims, subject to the following terms: 90% of cash 
expenditures in excess of the amount included in base 
electric rates is recoverable by IP from a trust fund 
established by IP. At December 31, 2009, the trust fund 
balance was $23 million, including accumulated interest. If 
cash expenditures are less than the amount in base rates, IP 
will contribute 90% of the difference to the fund. Once the 
trust fund is depleted, 90% of allowed cash expenditures in 
excess of base rates will be recoverable through charges 
assessed to customers under the tariff rider.  

In 2009, a new law became effective in Illinois that allows 

electric and natural gas utilities to recover through a rate 
adjustment the difference between their actual bad debt 
expense and the bad debt expense included in their base 
rates. In February 2010, the ICC approved the Ameren 
Illinois Utilities’ electric and natural gas rate adjustment tariffs 
to recover bad debt expense not recovered in base rates.  

If certain criteria are met, CIPS’, CILCO’s and IP’s 
natural gas rates may be adjusted without a traditional rate 
proceeding. PGA clauses permit prudently incurred natural 
gas costs to be passed directly to the consumer.  

FERC regulates the rates charged and the terms and 

conditions for electric transmission services. Each RTO 
separately files regional transmission tariff rates for approval 
by FERC. All members within that RTO are then subjected to 
those rates. As members of MISO, the Ameren Illinois 
Utilities’ transmission rate is calculated in accordance with 
MISO’s rate formula. The transmission rate is updated in 
June of each year based on FERC filings. This rate is 
charged directly to wholesale customers and alternative retail 
electric suppliers. For retail customers who have not chosen 
an alternative retail electric supplier, the transmission rate is 
collected through a rider mechanism.  

For additional information on Illinois rate matters, 
including the currently pending electric and natural gas rate 
cases, see Results of Operations and Outlook in 
Management’s Discussion and Analysis of Financial 
Condition and Results of Operations under Part II, Item 7, 
Quantitative and Qualitative Disclosures About Market Risk 
under Part II, Item 7A, and Note 2 – Rate and Regulatory 
Matters, and Note 15 – Commitments and Contingencies 
under Part II, Item 8, of this report.  

Merchant Generation  

Merchant Generation revenues are determined by 
market conditions and contractual arrangements. We expect 
the Merchant Generation fleet of assets to have 6,370 
megawatts of capacity available for the 2010 peak summer 
electrical demand. As discussed below, Genco, AERG and 
EEI sell all of their power and capacity to Marketing Company 
through power supply agreements. Marketing Company 
attempts to optimize the value of those assets and mitigate 
risks through a variety of hedging techniques, including 
wholesale sales of capacity and energy, retail sales in the 
non-rate-regulated Illinois market, spot market sales primarily 
in MISO and PJM, and financial transactions. Marketing 
Company enters into long-term and short-term contracts. 
Marketing Company’s counterparties include cooperatives, 
municipalities, commercial and industrial customers, power 
marketers, MISO, and investor-owned utilities such as the 
Ameren Illinois Utilities. For additional information on 
Marketing Company’s hedging activities and Marketing 
Company’s sales to the Ameren Illinois Utilities, see Outlook 
in Management’s Discussion and Analysis of Financial 
Condition and Results of Operations under Part II, Item 7 and 
Note 7 – Derivative Financial Instruments and Note 14 – 
Related Party Transactions under Part II, Item 8, of this 
report.  

General Regulatory Matters  

UE, CIPS, CILCO and IP must receive FERC approval to 

issue short-term debt securities and to conduct certain 
acquisitions, mergers and consolidations involving electric 
utility holding companies having a value in excess of 
$10 million. In addition, these Ameren utilities must receive 
authorization from the applicable state public utility regulatory  

6 

  
 
 
 
 
 
 
 
  
  
agency to issue stock and long-term debt securities (with 
maturities of more than 12 months) and to conduct mergers, 
affiliate transactions, and various other activities. Genco, 
AERG and EEI are subject to FERC’s jurisdiction when they 
issue any securities.  

Under PUHCA 2005, FERC and any state public utility 

regulatory agencies may access books and records of 
Ameren and its subsidiaries that are determined to be 
relevant to costs incurred by Ameren’s rate-regulated 
subsidiaries with respect to jurisdictional rates. PUHCA 2005 
also permits Ameren, the ICC, or the MoPSC to request that 
FERC review cost allocations by Ameren Services to other 
Ameren companies.  

Operation of UE’s Callaway nuclear plant is subject to 
regulation by the NRC. Its facility operating license expires on 
June 11, 2024. UE intends to submit a license extension 
application with the NRC to extend the plant’s operating 
license to 2044. UE’s Osage hydroelectric plant and UE’s 
Taum Sauk pumped-storage hydroelectric plant, as licensed 
projects under the Federal Power Act, are subject to FERC 
regulations affecting, among other things, the general 
operation and maintenance of the projects. The license for 
UE’s Osage hydroelectric plant expires on March 30, 2047, 
and the license for UE’s Taum Sauk plant expires on 
June 30, 2010. In June 2008, UE filed an application with 
FERC to relicense its Taum Sauk plant for another 40 years. 
Approval and relicensure are expected in 2012. Operations 
are permitted to continue under the current license while the 
application for relicensing is pending. The Taum Sauk plant is 
currently out of service. It is being rebuilt due to a major 
breach of the upper reservoir in December 2005. UE expects 
the Taum Sauk plant to become operational in the second 
quarter of 2010. UE’s Keokuk plant and its dam, in the 
Mississippi River between Hamilton, Illinois, and Keokuk, 
Iowa, are operated under authority granted by an Act of 
Congress in 1905.  

For additional information on regulatory matters, see 

Note 2 – Rate and Regulatory Matters and Note 15 – 
Commitments and Contingencies under Part II, Item 8, of this 
report, which include a discussion about the December 2005 
breach of the upper reservoir at UE’s Taum Sauk pumped-
storage hydroelectric plant.  

Environmental Matters  

Certain of our operations are subject to federal, state, 
and local environmental statutes or regulations relating to the 
safety and health of personnel, the public, and the 
environment. These environmental statutes and regulations 
include requirements for identification, generation, storage, 
handling, transportation, disposal, recordkeeping, labeling, 
reporting, and emergency response in connection with 
hazardous and toxic materials, safety and health standards, 
and environmental protection requirements, including 
standards and limitations relating to the discharge of air and 
water pollutants and the management of waste and 
byproduct materials. Failure to comply with those statutes or 
regulations could have material adverse effects on us. We 
could be subject to criminal or civil penalties by regulatory  

agencies. We could be ordered to make payment to private 
parties by the courts. Except as indicated in this report, we 
believe that we are in material compliance with existing 
statutes and regulations.  

For additional discussion of environmental matters, 

including NOx , SO2 , and mercury emission reduction 
requirements, global climate change, remediation efforts and 
UE’s receipt in January 2010 of a Notice of Violation from the 
EPA alleging violations of the Clean Air Act’s NSR and New 
Source Performance Standards (NSPS) provisions, see 
Liquidity and Capital Resources in Management’s Discussion 
and Analysis of Financial Condition and Results of 
Operations under Part II, Item 7, and Note 15 – 
Commitments and Contingencies under Part II, Item 8, of this 
report.  

SUPPLY FOR ELECTRIC POWER  

Ameren owns an integrated transmission system that 

comprises the transmission assets of UE, CIPS, CILCO, IP 
and AITC. Ameren also operates two balancing authority 
areas, AMMO (which includes UE) and AMIL (which includes 
CIPS, CILCO, IP, AITC, Genco and AERG). During 2009, the 
peak demand in AMMO was 8,081 MW and in AMIL was 
8,607 MW. The Ameren transmission system directly 
connects with 15 other balancing authority areas for the 
exchange of electric energy.  

UE, CIPS, CILCO and IP are transmission-owning 
members of MISO. Transmission service on the UE, CIPS, 
CILCO and IP transmission systems is provided pursuant to 
the terms of the MISO OATT on file with FERC. EEI operates 
its own balancing authority area and its own transmission 
facilities in southern Illinois. The EEI transmission system is 
directly connected to MISO and TVA. EEI’s generating units 
are dispatched separately from those of UE, Genco and 
AERG.  

The Ameren Companies and EEI are members of SERC. 

SERC is responsible for the bulk electric power supply 
system in much of the southeastern United States, including 
all or portions of Missouri, Illinois, Arkansas, Kentucky, 
Tennessee, North Carolina, South Carolina, Georgia, 
Mississippi, Alabama, Louisiana, Virginia, Florida, Oklahoma, 
Iowa, and Texas.  

See Note 2 – Rate and Regulatory Matters under Part II, 

Item 8, of this report for additional information.  

Missouri Regulated  

UE’s electric supply is obtained primarily from its own 

generation. Factors that could cause UE to purchase power 
include, among other things, absence of sufficient owned 
generation, plant outages, the fulfillment of renewable energy 
requirements, the failure of suppliers to meet their power 
supply obligations, extreme weather conditions, and the 
availability of power at a cost lower than the cost of 
generating it.  

UE continues to evaluate its longer-term needs for new 

baseload and peaking electric generation capacity. UE’s  

7 

  
  
integrated resource plan filed with the MoPSC in February 
2008 included the expectation that new baseload 
generation capacity would be required in the 2018 to 2020 
time frame. Due to the significant time required to plan, 
acquire permits for, and build a baseload power plant, UE 
is actively studying future plant alternatives, including 
energy efficiency programs that could help defer new plant 
construction. UE’s 2008 integrated resource plan included 
proposals to pursue energy efficiency programs, expand 
the role of renewable energy sources in UE’s overall 
generation mix, increase operational efficiency at existing 
power plants, and possibly retire some generating units 
that are older and less efficient. UE will file a new 
integrated resource plan with the MoPSC in 2011.  

See also Outlook in Management’s Discussion and 
Analysis of Financial Condition and Results of Operations 
under Part II, Item 7 and Note 2 – Rate and Regulatory 
Matters and Note 15 – Commitments and Contingencies 
under Part II, Item 8, of this report.  

Illinois Regulated  

As of January 1, 2007, CIPS, CILCO and IP were 
required to obtain from market sources all electric supply 
requirements for customers, except those declared 
competitive, who did not purchase electric supply from 
third-party suppliers. The power procurement costs 
incurred by CIPS, CILCO and IP are passed directly to 
their customers through a cost recovery mechanism.  
In September 2006, a reverse power procurement 

auction was held, as a result of which CIPS, CILCO and 
IP entered into power supply contracts with the winning 
bidders, including Marketing Company. Under these 
contracts, the electric suppliers are responsible for 
providing to CIPS, CILCO and IP energy, capacity, certain 
transmission, volumetric risk management, and other 
services necessary for the Ameren Illinois Utilities to serve 
the electric load needs of fixed-price residential and small 
commercial customers (with less than one MW of 
demand) at an all-inclusive fixed price. These contracts 
commenced on January 1, 2007, with one-third of the 
supply contracts expiring in May 2008, 2009 and 2010.  
As part of the 2007 Illinois Electric Settlement 
Agreement, the reverse power procurement auction 
process was discontinued and a new competitive power 
procurement process led by the IPA beginning in 2009 
was established. In January 2009, the ICC approved the 
electric power procurement plan filed by the IPA for both 
the Ameren Illinois Utilities and Commonwealth Edison 
Company. The plan outlined the wholesale products that 
the IPA procured on behalf of the Ameren Illinois Utilities 
for the period June 1, 2009, through May 31, 2014. The 
IPA procured capacity, energy swaps, and renewable 
energy credits through an RFP process on behalf of the 
Ameren Illinois Utilities in the second quarter of 2009. In 

August 2009, the IPA submitted its plan to the ICC for 
procurement of electric power for the Ameren Illinois 
Utilities and Commonwealth Edison Company for the 
period June 1, 2010, through May 31, 2015. The plan was 
modified and approved by the ICC in December 2009. The 
IPA will procure energy swaps, capacity and renewable 
energy credits, and long-term renewable supply.  

A portion of the electric power supply required for the 

Ameren Illinois Utilities to satisfy their distribution 
customers’ requirements is purchased from Marketing 
Company on behalf of Genco, AERG and EEI. Also as 
part of the 2007 Illinois Electric Settlement Agreement, the 
Ameren Illinois Utilities entered into financial contracts 
with Marketing Company (for the benefit of Genco and 
AERG) to lock in energy prices for 400 to 1,000 
megawatts annually of their round-the-clock power 
requirements during the period June 1, 2008, through 
December 31, 2012, at relevant market prices at that time. 
These financial contracts do not include capacity, are not 
load-following products, and do not involve the physical 
delivery of energy.  

See Note 2 – Rate and Regulatory Matters, Note 14 – 

Related Party Transactions and Note 15 – Commitments 
and Contingencies under Part II, Item 8, of this report for 
additional information on power procurement in Illinois.  

Merchant Generation  

Genco and AERG have entered into power supply 
agreements with Marketing Company whereby Genco and 
AERG sell and Marketing Company purchases all the 
capacity available from Genco’s and AERG’s generation 
fleets and the associated energy. These power supply 
agreements continue through December 31, 2022, and 
from year to year thereafter unless either party elects to 
terminate the agreement by providing the other party with 
no less than six months advance written notice. EEI and 
Marketing Company have entered into a power supply 
agreement for EEI to sell all of its capacity and energy to 
Marketing Company. This agreement expires on 
December 31, 2015. All of Genco’s, AERG’s and EEI’s 
generating facilities compete for the sale of energy and 
capacity in the competitive energy markets through 
Marketing Company. See Note 14 – Related Party 
Transactions under Part II, Item 8, of this report for 
additional information.  

Factors that could cause Marketing Company to 
purchase power for the Merchant Generation business 
segment include, among other things, absence of 
sufficient owned generation, plant outages, the fulfillment 
of renewable energy requirements, the failure of suppliers 
to meet their power supply obligations, extreme weather 
conditions, and the availability of power at a cost lower 
than the cost of generating it. 

8 

 
  
FUEL FOR POWER GENERATION  

The following table presents the source of electric generation by fuel type, excluding purchased power, for the years 

ended December 31, 2009, 2008 and 2007:  

Nuclear 

Natural Gas 

Hydroelectric 

Ameren:(a)  

2009 .................................................................................................................   
2008 .................................................................................................................   
2007 .................................................................................................................   

2009 .................................................................................................................   
2008 .................................................................................................................   
2007 .................................................................................................................   

Missouri Regulated: 
UE: 

Merchant Generation: 
Genco: 

2009 .................................................................................................................   
2008 .................................................................................................................   
2007 .................................................................................................................   

2009 .................................................................................................................    100 % 
99   
2008 .................................................................................................................   
99   
2007 .................................................................................................................   

CILCO (AERG): 

EEI: 

2009 .................................................................................................................    100 % 
2008 .................................................................................................................    100   
2007 .................................................................................................................    100   

Total Merchant Generation: 

2009 .................................................................................................................   
2008 .................................................................................................................   
2007 .................................................................................................................   
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

99 % 
99   
98   

-% 
-   
-   

(a) 
(b)  Less than 1% of total fuel supply.  

Coal 

83 % 
85   
84   

75 % 
77   
76   

99 % 
99   
96   

13% 
12   
12   

21% 
19   
19   

-% 
-   
-   

-% 
-   
-   

-% 
-   
-   

1% 
1   
2   

(b)% 
1   
2   

1% 
1   
4   

(b)% 
1   
1   

-% 
-   
-   

1% 
1   
2   

3% 
2   
2   

4% 
3   
3   

-% 
-   
-   

-% 
-   
-   

-% 
-   
-   

-% 
-   
-   

Oil 

(b)% 
(b) 
(b) 

-% 
(b) 
(b) 

(b)% 
(b) 
(b) 

-% 
-  
(b) 

-% 
-  
-  

(b)% 
(b) 
(b) 

9 

  
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table presents the cost of fuels for electric generation for the years ended December 31, 2009, 2008 

and 2007:  

Cost of Fuels (Dollars per million Btus) 

2009 

2008 

2007 

$ 

$ 

$ 

$ 

$ 

1.399 
0.490 
7.939 
1.462 

1.654   
0.620   
8.685   
1.591   

1.572 (b) 
0.493   
10.503   
1.573 (b) 

Ameren: 
Coal(a)  ....................................................................................................................................................   $ 
Nuclear ...................................................................................................................................................  
Natural gas(c) ..........................................................................................................................................  
Weighted average – all fuels(d) ................................................................................................................   $ 
Missouri Regulated: 
UE: 
Coal(a)  ....................................................................................................................................................   $ 
Nuclear ...................................................................................................................................................  
Natural gas(c) ..........................................................................................................................................  
Weighted average – all fuels(d) ................................................................................................................   $ 
Merchant Generation: 
Genco: 
Coal(a)  ....................................................................................................................................................   $ 
Natural gas(c) ..........................................................................................................................................  
Weighted average – all fuels(d) ................................................................................................................   $ 
CILCO (AERG): 
Coal(a)  ....................................................................................................................................................   $ 
Weighted average – all fuels(d) ................................................................................................................   $ 
EEI: 
Coal(a)  ....................................................................................................................................................   $ 
Total Merchant Generation: 
Coal(a)  ....................................................................................................................................................   $ 
Natural gas(c) ..........................................................................................................................................  
Weighted average – all fuels(d) ................................................................................................................   $ 
$ 
(a)  The fuel cost for coal represents the cost of coal, costs for transportation, which includes diesel fuel adders, and cost of emission allowances.  
(b)  Excludes impact of the Genco coal supply contract settlement under which Genco received a lump-sum payment of $60 million in July 2008 from a coal mine 

1.426   
0.493   
10.264   
1.340   

1.534   
0.620   
8.544   
1.386   

1.746 (b) 
10.764   
1.919 (b) 

1.958 (b) 
15.857   
2.121 (b) 

1.877   
13.159   
2.001   

1.813   
8.796   
1.934   

(c)  The fuel cost for natural gas represents the cost of natural gas and firm and variable costs for transportation, storage, balancing, and fuel losses for delivery 

owner. See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of this report.  
to the plant. In addition, the fixed costs for firm transportation and firm storage capacity are included in the calculation of fuel cost for the generating facilities.  
paint products, and handling. Oil, paint, propane, and tire chips are not individually listed in this table because their use is minimal.  

(d)  Represents all costs for fuels used in our electric generating facilities, to the extent applicable, including coal, nuclear, natural gas, oil, propane, tire chips, 

1.284 
0.490 
7.580 
1.271 

1.643   
1.673   

1.598   
1.721   

1.545 
8.390 
1.759 

1.717 
8.440 
1.939 

1.309 
1.450 

1.855   

1.438   

1.329 

$ 
$ 

$ 
$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

Coal  

UE, Genco, AERG and EEI have agreements in place 
to purchase a portion of their coal needs and to transport it 
to electric generating facilities through 2019. UE, Genco, 
AERG and EEI expect to enter into additional contracts to 
purchase coal from time to time. Coal supply agreements 
typically have an initial term of five years, with about 20% 
of the contracts expiring annually. Ameren burned 
37.6 million tons (UE – 21.3 million, Genco – 7.9 million, 
AERG – 4.0 million, EEI – 4.4 million) of coal in 2009. See 
Part II, Item 7A – Quantitative and Qualitative Disclosures 
About Market Risk of this report for additional information 
about coal supply contracts.  

About 96% of Ameren’s coal (UE – 96%, Genco – 

99%, AERG – 89%, EEI – 100%) is purchased from the 
Powder River Basin in Wyoming. The remaining coal is 
typically purchased from the Illinois Basin. UE, Genco, 
AERG and EEI have a policy to maintain coal inventory 
consistent with their projected usage. Inventory may be 
adjusted because of uncertainties of supply due to 
potential work stoppages, delays in coal deliveries, 

equipment breakdowns, and other factors. In the past, 
deliveries from the Powder River Basin have occasionally 
been restricted because of rail maintenance, weather, and 
derailments. As of December 31, 2009, coal inventories 
for UE, Genco, AERG and EEI were at targeted levels. 
Disruptions in coal deliveries could cause UE, Genco, 
AERG and EEI to pursue a strategy that could include 
reducing sales of power during low-margin periods, buying 
higher-cost fuels to generate required electricity, and 
purchasing power from other sources.  

Nuclear  

Developing nuclear fuel generally involves the mining 

and milling of uranium ore to produce uranium 
concentrates, the conversion of uranium concentrates to 
uranium hexafluoride gas, the enrichment of that gas, and 
the fabrication of the enriched uranium hexafluoride gas 
into usable fuel assemblies. UE has entered into uranium, 
uranium conversion, enrichment, and fabrication contracts 
to procure the fuel supply for its Callaway nuclear plant.  

10 

  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
  
  
  
 
 
 
 
 
 
  
  
Fuel assemblies for the 2010 spring refueling at UE’s 

Callaway nuclear plant have been manufactured and 
delivered to the plant. UE also has agreements or inventories 
to price-hedge approximately 89% of Callaway’s 2011 and 
79% of Callaway’s 2013 refueling requirements. UE has 
uranium (concentrate and hexafluoride) inventories and 
supply contracts sufficient to meet all of its uranium and 
conversion requirements at least through 2014. UE has 
enriched uranium inventories and enrichment supply 
contracts sufficient to satisfy enrichment requirements 
through 2012. Fuel fabrication services are under contract 
through 2010. UE expects to enter into additional contracts to 
purchase nuclear fuel. As a member of Fuelco, UE can join 
with other member companies to increase its purchasing 
power and opportunities for volume discounts. The Callaway 
nuclear plant normally requires refueling at 18-month 
intervals. The last refueling was completed in November 
2008. The nuclear fuel markets are competitive, and prices 
can be volatile; however, we do not anticipate any significant 
problems in meeting our future supply requirements.  

Natural Gas Supply  

To maintain gas deliveries to gas-fired generating units 

throughout the year, especially during the summer peak 
demand, Ameren’s portfolio of natural gas supply resources 
includes firm transportation capacity and firm no-notice 
storage capacity leased from interstate pipelines. UE, Genco 
and EEI primarily use the interstate pipeline systems of 
Panhandle Eastern Pipe Line Company, Trunkline Gas 
Company, Natural Gas Pipeline Company of America, and 
Mississippi River Transmission Corporation to transport 
natural gas to generating units. In addition to physical 
transactions, Ameren uses financial instruments, including 
some in the NYMEX futures market and some in the OTC 
financial markets, to hedge the price paid for natural gas. 

UE, Genco and EEI’s natural gas procurement strategy 

is designed to ensure reliable and immediate delivery of 
natural gas to their generating units. UE, Genco and EEI do 
this in two ways. They optimize transportation and storage 
options and minimize cost and price risk through various 
supply and price-hedging agreements that allow them to 
maintain access to multiple gas pools, supply basins, and 
storage. As of December 31, 2009, UE had price-hedged 
about 89% and Genco had price-hedged 100% of their 
expected natural gas supply requirements for generation in 
2010. As of December 31, 2009, EEI did not have any of its 
required gas supply for generation hedged for price risk.  

Renewable Energy  

Illinois and Missouri have enacted laws requiring electric 

utilities to include renewable energy resources in their 
portfolios. Illinois requires renewable energy resources to 
equal or exceed 2% of the total electricity that each electric 
utility supplies to its eligible retail customers as of June 1, 
2008, increasing to 10% by June 1, 2015, and to 25% by 
June 1, 2025. The Ameren Illinois Utilities have procured 
renewable energy credits under the ICC-approved RFP to 
meet this requirement through May 2010. See Note 2 – Rate 
and Regulatory Matters under Part II, Item 8, for additional 
information about the Illinois power procurement process. In 

Missouri, utilities will be required to purchase or generate 
electricity from renewable energy sources equaling at least 
2% of native load sales by 2011, with that percentage 
increasing in subsequent years to at least 15% by 2021, 
subject to a 1% limit on customer rate impacts. At least 2% of 
each renewable energy portfolio requirement must be derived 
from solar energy. UE expects to satisfy the 2011 
requirement with existing renewable generation in its current 
fleet along with a 15-year, 102-MW power purchase 
agreement with a wind farm operator in Iowa that began 
generation in 2009 and the 15-MW landfill gas project 
discussed below.  

In September 2009, UE announced an agreement with a 

landfill owner to install CTs at a landfill site in St. Louis 
County, Missouri, which would generate approximately 15-
MW of electricity by burning methane gas collected from the 
landfill. Construction of the CTs is expected to begin in 2010, 
and the CTs are expected to begin generating power in 2011. 
UE signed a 20-year supply agreement with the landfill owner 
to purchase methane gas.  

Energy Efficiency  

Ameren’s regulated utilities have implemented energy 

efficiency programs to educate and help their customers 
become more efficient users of energy. A new law in Missouri 
allows electric utilities to recover costs related to MoPSC-
approved energy efficiency programs. The new law could, 
among other things, allow UE to earn a return on its energy 
efficiency programs equivalent to the return UE could earn 
with supply-side capital investments, such as new power 
plants. UE introduced multiple energy efficiency programs in 
2009. The goal of these recently announced and future UE 
energy efficiency programs is to reduce usage by 540-MW by 
2025. UE has set up a website at www.uefficiency.com in 
order to provide more information to its customers regarding 
energy efficiency.  

The Ameren Illinois Utilities are participating in the Illinois 

Clean Energy Community Foundation, a program that 
supports energy efficiency, promotes renewable energy, and 
provides educational opportunities. In June 2008, the ICC 
issued an order approving the Ameren Illinois Utilities’ electric 
energy efficiency plan as well as a cost recovery mechanism 
by which the program costs will be recovered from electric 
customers. In October 2008, the ICC issued an order 
approving the Ameren Illinois Utilities’ natural gas energy 
efficiency plan as well as a cost recovery mechanism by 
which the program costs will be recovered from natural gas 
customers. The Ameren Illinois Utilities have set up a website 
at www.actonenergy.com in order to provide more 
information to their customers regarding energy efficiency.  

NATURAL GAS SUPPLY FOR DISTRIBUTION  
UE, CIPS, CILCO and IP are responsible for the 

purchase and delivery of natural gas to their gas utility 
customers. UE, CIPS, CILCO and IP develop and manage a 
portfolio of gas supply resources. These include firm gas 
supply under term  

11 

  
  pressure on customer growth and usage in light of 

 

current economic conditions;  
the potential for reregulation in some states, including 
Illinois, which could cause electric distribution 
companies to build or acquire generation facilities and 
to purchase less power from electric generating 
companies such as Genco, AERG and EEI;  

 

  changes in the structure of the industry as a result of 
changes in federal and state laws, including the 
formation of merchant generating and independent 
transmission entities and RTOs;  
increases or decreases in power prices due to the 
balance of supply and demand;  
the availability of fuel and increases or decreases in 
fuel prices;  
the availability of qualified labor and material, and 
rising costs;  
regulatory lag;  

 
  negative free cash flows due to rising investments and 

 

 

the regulatory framework;  

  continually developing and complex environmental 
laws, regulations and issues, including air-quality 
standards, mercury regulations, and increasingly likely 
greenhouse gas limitations and ash management 
requirements;  

  public concern about the siting of new facilities;  
  aging infrastructure and the need to construct new 
power generation, transmission and distribution 
facilities;  

  proposals for programs to encourage or mandate 

energy efficiency and renewable sources of power;  

  public concerns about nuclear plant operation and 

decommissioning and the disposal of nuclear waste; 
and  

  consolidation of electric and natural gas companies.  
We are monitoring these issues. Except as otherwise 
noted in this report, we are unable to predict what impact, 
if any, these issues will have on our results of operations, 
financial position, or liquidity. For additional information, 
see Risk Factors under Part I, Item 1A, and Outlook and 
Regulatory Matters in Management’s Discussion and 
Analysis of Financial Condition and Results of Operations 
under Part II, Item 7, and Note 2 – Rate and Regulatory 
Matters, and Note 15 – Commitments and Contingencies 
under Part II, Item 8, of this report.

agreements with producers, interstate and intrastate firm 
transportation capacity, firm storage capacity leased from 
interstate pipelines, and on-system storage facilities to 
maintain gas deliveries to customers throughout the year 
and especially during peak demand. UE, CIPS, CILCO 
and IP primarily use the Panhandle Eastern Pipe Line 
Company, the Trunkline Gas Company, the Natural Gas 
Pipeline Company of America, the Mississippi River 
Transmission Corporation, and the Texas Eastern 
Transmission Corporation interstate pipeline systems to 
transport natural gas to their systems. In addition to 
physical transactions, financial instruments, including 
those entered into in the NYMEX futures market and in the 
OTC financial markets, are used to hedge the price paid 
for natural gas. See Part II, Item 7A – Quantitative and 
Qualitative Disclosures About Market Risk of this report for 
additional information about natural gas supply contracts. 
Prudently incurred natural gas purchase costs are passed 
on to customers of UE, CIPS, CILCO and IP in Illinois and 
Missouri under PGA clauses, subject to prudency review 
by the ICC and the MoPSC.  

For additional information on our fuel and purchased 

power supply, see Results of Operations, Liquidity and 
Capital Resources and Effects of Inflation and Changing 
Prices in Management’s Discussion and Analysis of 
Financial Condition and Results of Operations under Part 
II, Item 7, of this report. Also see Quantitative and 
Qualitative Disclosures About Market Risk under Part II, 
Item 7A, of this report, Note 1 – Summary of Significant 
Accounting Policies, Note 7 – Derivative Financial 
Instruments, Note 14 – Related Party Transactions, Note 
15 – Commitments and Contingencies, and Note 16 – 
Callaway Nuclear Plant under Part II, Item 8.  

INDUSTRY ISSUES  

We are facing issues common to the electric and 

natural gas utility industry and the merchant electric 
generation industry. These issues include:  
  political and regulatory resistance to higher rates, 

 

especially in a recessionary economic environment;  
the potential for changes in laws, regulation, and 
policies at the state and federal level, including those 
resulting from election cycles;  

  access to, and uncertainty in, the capital and credit 

 

markets;  
the potential for more intense competition in 
generation, supply and distribution, including new 
technologies;  

12 

  
  
OPERATING STATISTICS  

The following tables present key electric and natural gas operating statistics for Ameren for the past three years:  
2007 

Electric Operating Statistics – Year Ended December 31, 

2009 

2008 

Electric Sales – kilowatthours (in millions): 
Missouri Regulated: 

Residential ......................................................................................................................................    
Commercial .....................................................................................................................................    
Industrial .........................................................................................................................................    
Other ...............................................................................................................................................    
Native load subtotal ....................................................................................................................    
Off-system sales .............................................................................................................................    
Subtotal ......................................................................................................................................    

Illinois Regulated: 
Residential 
Commercial 

Industrial 

Power supply and delivery service ..............................................................................................    
Power supply and delivery service ..............................................................................................    
Delivery service only ...................................................................................................................    
Power supply and delivery service ..............................................................................................    
Delivery service only ...................................................................................................................    
Other...............................................................................................................................................    
Native load subtotal ....................................................................................................................    

Merchant Generation: 

Nonaffiliate energy sales .................................................................................................................    
Affiliate native energy sales .............................................................................................................    
Subtotal ......................................................................................................................................    
Eliminate affiliate sales...........................................................................................................................    
Eliminate Illinois Regulated/Merchant Generation common customers ...................................................    
Ameren total ...............................................................................................................................    

Electric Operating Revenues (in millions): 
Missouri Regulated: 

Residential ......................................................................................................................................   $ 
Commercial .....................................................................................................................................    
Industrial .........................................................................................................................................    
Other...............................................................................................................................................    
Native load subtotal ....................................................................................................................    
Off-system sales .............................................................................................................................    
Subtotal ......................................................................................................................................   $ 

Illinois Regulated: 
Residential 
Commercial 

Industrial 

Power supply and delivery service ..............................................................................................   $ 
Power supply and delivery service ..............................................................................................    
Delivery service only ...................................................................................................................    
Power supply and delivery service ..............................................................................................    
Delivery service only ...................................................................................................................    
Other...............................................................................................................................................    
Native load subtotal ....................................................................................................................   $ 

Merchant Generation: 

Nonaffiliate energy sales .................................................................................................................   $ 
Affiliate native energy sales .............................................................................................................    
Other...............................................................................................................................................    
Subtotal ......................................................................................................................................   $ 
Eliminate affiliate revenues ....................................................................................................................    
Ameren total ...............................................................................................................................   $ 

13,413  
14,510  
7,037  
1,655  
36,615  
12,447  
49,062  

11,089  
5,235  
6,797  
514  
10,712  
546  
34,893  

25,673  
3,529  
29,202  
(3,529 ) 
(5,566 ) 
104,062  

982  
881  
314  
122  
2,299  
401  
2,700  

1,094  
521  
103  
22  
36  
157  
1,933  

1,340  
385  
(15 ) 
1,710  
(434 ) 
5,909  

13,904  
14,690  
9,256  
785  
38,635  
10,457  
49,092  

11,667  
6,095  
6,147  
1,442  
11,300  
555  
37,206  

26,395  
6,055  
32,450  
(6,055) 
(4,939) 
107,754  

948  
838  
372  
108  
2,266  
490  
2,756  

1,112  
616  
77  
102  
30  
285  
2,222  

1,389  
441  
106  
1,936  
(547) 
6,367  

$ 

$ 

$ 

$ 

$ 

$ 

$ 

14,258  
14,766  
9,675  
759  
39,458  
10,984  
50,442  

11,857  
7,232  
5,178  
1,606  
11,199  
576  
37,648  

25,196  
7,296  
32,492  
(7,296) 
(5,800) 
107,486  

980  
839  
390  
93  
2,302  
484  
2,786  

1,055  
666  
54  
105  
24  
372  
2,276  

1,310  
461  
41  
1,812  
(591) 
6,283  

$ 

$ 

$ 

$ 

$ 

$ 

$ 

13 

  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
Electric Operating Statistics – Year Ended December 31, 

Electric Generation – megawatthours (in millions): 

Missouri Regulated ...........................................................................................................................  
Merchant Generation: 
Genco.........................................................................................................................................  
AERG .........................................................................................................................................  
EEI .............................................................................................................................................  
Medina Valley .............................................................................................................................  
Subtotal ................................................................................................................................  
Ameren total..........................................................................................................................  
Price per ton of delivered coal (average) ................................................................................................  
Source of energy supply: 

Coal .................................................................................................................................................  
Gas ..................................................................................................................................................  
Nuclear ............................................................................................................................................  
Hydroelectric ....................................................................................................................................  
Purchased and interchanged, net .....................................................................................................     

Gas Operating Statistics – Year Ended December 31, 

Gas Sales (millions of Dth) 
Missouri Regulated: 

Illinois Regulated: 

Residential ........................................................................................................................................  
Commercial .......................................................................................................................................  
Industrial ...........................................................................................................................................  
Subtotal .......................................................................................................................................  

Residential ........................................................................................................................................  
Commercial .......................................................................................................................................  
Industrial ...........................................................................................................................................  
Subtotal .......................................................................................................................................  

Industrial ...........................................................................................................................................  
Subtotal .......................................................................................................................................  
Eliminate affiliate sales............................................................................................................................  
Ameren total ................................................................................................................................  

Other: 

Natural Gas Operating Revenues (in millions) 
Missouri Regulated: 

Illinois Regulated: 

Residential ........................................................................................................................................  
Commercial .......................................................................................................................................  
Industrial ...........................................................................................................................................  
Other .................................................................................................................................................  
Subtotal .......................................................................................................................................  

Residential ........................................................................................................................................  
Commercial .......................................................................................................................................  
Industrial ...........................................................................................................................................  
Other .................................................................................................................................................  
Subtotal .......................................................................................................................................  

Industrial ...........................................................................................................................................  
Subtotal .......................................................................................................................................  
Eliminate affiliate revenues .....................................................................................................................   
Ameren total ................................................................................................................................  

Peak day throughput (thousands of Dth): 

UE  
CIPS .................................................................................................................................................  
CILCO ...............................................................................................................................................  
IP   

Total peak day throughput.......................................................................................................................  

Other: 

2009 

2008 

2007 

$ 

48.7   
13.4   
6.8   
7.1   
0.2   
27.5   
76.2   
29.85   

67.0 % 
0.6   
10.8   
2.0   
19.6   
100.0 % 

49.3   
16.6   
6.7   
8.0   
0.2   
31.5   
80.8   
  26.90(a) 

70.1% 
0.8   
9.5   
1.8   
17.8   
100.0% 

$ 

50.3   
17.4   
5.3   
8.1   
0.2   
31.0   
81.3   
25.20   

68.7% 
1.8   
9.4   
1.6   
18.5   
100.0% 

$ 

2009 

2008 

2007 

7  
4  
1  
12  

60  
26  
7  
93  

3  
3  
-  
108  

106  
47  
10  
7  
170  

646  
259  
38  
58  
1,001  

15  
15  
(5) 
1,181  

163  
280  
423  
650  
1,516  

$ 

$ 

$ 

$ 

$ 
$ 

$ 

8  
4  
1  
13  

65  
28  
11  
104  

4  
4  
(1 ) 
120  

121  
54  
12  
14  
201  

819  
338  
119  
(21 ) 
1,255  

26  
26  
(10 ) 
1,472  

158  
266  
399  
615  
1,438  

$ 

$ 

$ 

$ 

$ 
$ 

$ 

7  
4  
1  
12  

59  
25  
10  
94  

2  
2  
-  
108  

108  
47  
12  
7  
174  

687  
272  
103  
39  
1,101  

16  
16  
(12) 
1,279  

155  
250  
401  
574  
1,380  

$ 

$ 

$ 

$ 

$ 
$ 

$ 

(a) 

Includes impact of the Genco coal settlement under which Genco received a lump-sum payment of $60 million in July 2008 from a coal mine owner. See 
Note 1 – Summary of Significant Account Policies under Part II, Item 8, of this report.  

14 

 
  
  
  
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
AVAILABLE INFORMATION  

The Ameren Companies make available free of charge 
through Ameren’s Web site (www.ameren.com) their annual 
reports on Form 10-K, quarterly reports on Form 10-Q, 
current reports on Form 8-K, and any amendments to those 
reports filed or furnished pursuant to Sections 13(a) or 15(d) 
of the Exchange Act as soon as reasonably possible after 
such reports are electronically filed with, or furnished to, the 
SEC. These documents are also available through an 
Internet Web site maintained by the SEC (www.sec.gov). 
Ameren also uses its Web site (www.ameren.com) as a 
channel of distribution of material information relating to the 
Ameren Companies. Financial and other material information 
regarding the Ameren Companies is routinely posted and 
accessible at Ameren’s Web site.  

The Ameren Companies also make available free of 
charge through Ameren’s Web site (www.ameren.com) the 
charters of Ameren’s board of directors’ audit and risk 
committee, human resources committee, nominating and 
corporate governance committee, finance committee, nuclear 
oversight committee, and public policy committee; the 
corporate governance guidelines; a policy regarding 
communications to the board of directors; a policy and 
procedures with respect to related-person transactions; a 
code of ethics for principal executive and senior financial 
officers; a code of business conduct applicable to all 
directors, officers and employees; and a director nomination 
policy that applies to the Ameren Companies. The 
information on Ameren’s Web site, or any other Web site 
referenced in this report, is not incorporated by reference into 
this report.  

ITEM  1A.  RISK FACTORS.  

Investors should review carefully the following risk 

factors and the other information contained in this report. The 
risks that the Ameren Companies face are not limited to 
those in this section. There may be additional risks and 
uncertainties (either currently unknown or not currently 
believed to be material) that could adversely affect the 
financial position, results of operations, and liquidity of the 
Ameren Companies. See Forward-looking Statements above 
and Outlook in Management’s Discussion and Analysis of 
Financial Condition and Results of Operations under Part II, 
Item 7, of this report.  

The electric and gas rates that UE, CIPS, CILCO and 

IP are allowed to charge are determined through 
regulatory proceedings and are subject to legislative 
actions, which are largely outside of their control. Any 
such events that prevent UE, CIPS, CILCO or IP from 
recovering their respective costs or from earning 
appropriate returns on their investments could have a 
material adverse effect on future results of operations, 
financial position, and liquidity.  

The rates that UE, CIPS, CILCO and IP are allowed to 

charge for their utility services significantly influence the 
results of operations, financial position, and liquidity of these 
companies and Ameren. The electric and natural gas utility 
industry is highly regulated. The utility rates charged to UE, 
CIPS, CILCO and IP customers are determined, in large part,  

by governmental entities, including the MoPSC, the ICC, and 
FERC. Decisions by these entities are influenced by many 
factors, including the cost of providing service, the prudency 
of expenditures, the quality of service, regulatory staff 
knowledge and experience, economic conditions, public 
policy, and social and political views, and are largely outside 
of our control. Decisions made by these governmental 
entities regarding rates, as well as the regulatory lag involved 
in filing and getting new rates approved, could have a 
material adverse effect on results of operations, financial 
position, and liquidity.  

UE, CIPS, CILCO and IP electric and gas utility rates are 
typically established in regulatory proceedings that take up to 
11 months to complete. Rates established in those 
proceedings are primarily based on historical costs and 
revenues, and they include an allowed return on investments 
by the regulator.  

Our company, and the industry as a whole, is going 

through a period of rising costs and investments. The fact 
that rates at UE, CIPS, CILCO and IP are primarily based on 
historical costs and revenues means that these companies 
may not be able to earn the allowed return established by 
their regulators and could result in deferral or elimination of 
planned capital investments. As a result, UE, CIPS, CILCO 
and IP expect to file rate cases frequently. A period of 
increasing rates for our customers, especially during weak 
economic times, could result in additional regulatory and 
legislative actions, as well as competitive and political 
pressures, that could have a material adverse effect on our 
results of operations, financial position, and liquidity.  

We are subject to various environmental laws and 

regulations that require significant capital expenditures 
or could result in closure of facilities, could increase our 
operating costs, and could adversely influence or limit 
our results of operations, financial position, and liquidity 
or expose us to environmental fines and liabilities.  

We are subject to various environmental laws and 
regulations enforced by federal, state and local authorities. 
From the beginning phases of siting and development to the 
ongoing operation of existing or new electric generating, 
transmission and distribution facilities, natural gas storage 
facilities, and natural gas transmission and distribution 
facilities, our activities involve compliance with diverse laws 
and regulations. These laws and regulations address noise, 
emissions, impacts to air, land and water, protected and 
cultural resources (such as wetlands, endangered species, 
and archeological and historical resources), and chemical 
and waste handling. Complex and lengthy processes are 
required to obtain approvals, permits, or licenses for new, 
existing or modified facilities. Additionally, the use and 
handling of various chemicals or hazardous materials 
(including wastes) requires release prevention plans and 
emergency response procedures.  

Compliance with environmental laws and regulations can 

require significant capital expenditures and operating costs. 
Periodically, environmental statutes and regulations are 
amended and new statutes and regulations are adopted that  

15 

  
impose new or modified obligations on our facilities and 
operations. Actions required to ensure that our facilities and 
operations are in compliance with environmental laws and 
regulations could be prohibitively expensive. As a result, we 
could be required to close or alter the operation of our 
facilities, which could have an adverse effect on our results of 
operations, financial position, and liquidity.  

Failure to comply with environmental laws and 

regulations may also result in the imposition of fines, 
penalties, and injunctive measures affecting operating 
assets. We are also subject to liability under environmental 
laws for remediating environmental contamination of property 
now or formerly owned by us or by our predecessors, as well 
as property contaminated by hazardous substances that we 
generated. Such sites include MGP sites and third-party 
sites, such as landfills. Additionally, private individuals may 
seek to enforce environmental laws and regulations against 
us and could allege injury from exposure to hazardous 
materials.  

Ameren also may be subject to risks in connection with 

changing or conflicting interpretations of existing laws and 
regulations. The EPA is engaged in an enforcement initiative 
targeted at coal-fired power plants in the United States to 
determine whether those power plants failed to comply with 
the requirements of the NSR and New Source Performance 
Standards (NSPS) provisions under the Clean Air Act when 
the plants implemented modifications. Failure to comply with 
the NSR and NSPS provisions under the Clean Air Act can 
result in increased capital expenditures for the installation of 
control technology, increased operations and maintenance 
expenses, and fines or penalties. In January 2010, UE 
received a Notice of Violation from the EPA alleging 
violations of the Clean Air Act’s NSR and Title V programs. 
An outcome in this matter, adverse to UE, could require 
substantial capital expenditures and the payment of 
substantial penalties, neither of which can be determined at 
this time. Such expenditures could affect unit retirement and 
replacement decisions and our results of operations, financial 
position, and liquidity if such costs are not recovered through 
regulated rates.  

Ameren, UE, Genco, AERG and EEI have incurred and 

expect to incur significant costs related to environmental 
compliance and site remediation. New environmental 
regulations, voluntary compliance guidelines, enforcement 
initiatives, or legislation could result in a significant increase 
in capital expenditures and operating costs, decreased 
revenues, increased financing requirements, penalties, or 
closure of facilities for UE, Genco, AERG and EEI. Although 
costs incurred by UE would be eligible for recovery in rates 
over time, subject to MoPSC approval in a rate proceeding, 
there is no similar mechanism for recovery of costs for 
Genco, AERG or EEI. We are unable to predict the ultimate 
impact of these matters on our results of operations, financial 
position and liquidity.  

Future limits on greenhouse gas emissions would 
likely require UE, Genco, CILCO (through AERG) and EEI 
to incur significant increases in capital expenditures and 
operating costs, which, if excessive, could result in the 
closures of coal-fired generating plants, impairment of  

assets, or otherwise materially adversely affect our 
results of operations, financial position, and liquidity.  

Initiatives to limit greenhouse gas emissions and to 
address climate change are subject to active consideration in 
the U.S. Congress. In June 2009, the U.S. House of 
Representatives passed energy legislation entitled “The 
American Clean Energy and Security Act of 2009” that, if 
enacted, would establish an economy-wide cap-and-trade 
program. The overarching goal of this proposed cap-and-
trade program is to reduce greenhouse gas emissions from 
capped sources, including coal-fired electric generation units, 
to 3% below 2005 levels by 2012, 17% below 2005 levels by 
2020, 42% below 2005 levels by 2030, and 83% below 2005 
levels by the year 2050. In September 2009, climate change 
legislation entitled “The Clean Energy Jobs and American 
Power Act” was introduced in the U.S. Senate that was 
similar to that passed by the U.S. House of Representatives 
in June 2009, although it proposes a slightly greater 
reduction in greenhouse gas emissions in the year 2020 and 
grants fewer emission allowances to the electricity sector. 
Under both proposed pieces of legislation, large sources of 
CO2 emissions will be required to obtain and retire an 
allowance for each ton of CO2 emitted. The allowances may 
be allocated to the sources without cost, sold to the sources 
through auctions or other mechanisms, or traded among 
parties. “The Clean Energy Jobs and American Power Act” 
was voted out of committee in November 2009. In December 
2009, Senators Kerry, Graham and Lieberman introduced a 
framework for Senate legislation in 2010. The framework 
lacks specifics, but it is consistent with the House-passed 
legislation except that it emphasizes the need for greater 
support for nuclear power and energy independence through 
support for clean energy and drilling for oil and natural gas. 
Senate leadership has stated that consideration of climate 
legislation will be postponed until spring 2010. In addition, the 
reduction of greenhouse gas emissions has been identified 
as a high priority by President Obama’s administration. 
Although we cannot predict the date of enactment or the 
requirements of any future climate change legislation or 
regulations, we believe it is possible that some form of 
federal legislation or regulations to control emissions of 
greenhouse gases will become law during the current 
administration.  

Potential impacts from climate change legislation could 

vary, depending upon proposed CO2 emission limits, the 
timing of implementation of those limits, the method of 
distributing allowances, the degree to which offsets are 
allowed and available, and provisions for cost containment 
measures, such as a “safety valve” provision that provides a 
maximum price for emission allowances. As a result of our 
diverse fuel portfolio, our emissions of greenhouse gases 
vary among our generating facilities, but coal-fired power 
plants are significant sources of CO2 , a principal greenhouse 
gas. Ameren’s analysis shows that if either “The American 
Clean Energy and Security Act of 2009” or “The Clean 
Energy Jobs and American Power Act” were enacted into law 
in its current form, household costs and rates for electricity 
could rise significantly. The burden could fall particularly hard 
on electricity consumers and upon the economy in the 
Midwest  

16 

  
because of the region’s reliance on electricity generated by 
coal-fired power plants. Natural gas emits about half the 
amount of CO 2 that coal emits when burned to produce 
electricity. As a result, economy-wide shifts favoring natural 
gas as a fuel source for electricity generation also could 
affect the cost of heating for our utility customers and many 
industrial processes. Ameren believes that wholesale natural 
gas costs could rise significantly as well. Higher costs for 
energy could contribute to reduced demand for electricity and 
natural gas.  

Additional requirements to control greenhouse gas 
emissions and address global climate change may also arise 
pursuant to the Midwest Greenhouse Gas Reduction Accord, 
an agreement signed by the governors of Illinois, Iowa, 
Kansas, Michigan, Wisconsin, and Minnesota to develop a 
strategy to achieve energy security and to reduce 
greenhouse gas emissions through a cap-and-trade 
mechanism. The advisory group to the Midwest governors 
provided draft final recommendations on the design of a 
greenhouse gas reduction program in June 2009. The 
recommendations have not been endorsed or approved by 
the state governors. It is uncertain whether legislation to 
implement the recommendations will be implemented or 
passed by any of the states, including Illinois.  

With regard to the control of greenhouse gas emissions 

under federal regulation, in 2007, the U.S. Supreme Court 
issued a decision finding that the EPA has the authority to 
regulate CO2 and other greenhouse gases from automobiles 
as “air pollutants” under the Clean Air Act. This decision 
required the EPA to determine whether greenhouse gas 
emissions may reasonably be anticipated to endanger public 
health or welfare, or, in the alternative, to provide a 
reasonable explanation as to why greenhouse gas emissions 
should not be regulated. In December 2009, in response to 
the decision of the U.S. Supreme Court, the EPA issued its 
“endangerment finding” determining that greenhouse gas 
emissions, including CO2 , endanger human health and 
welfare and that emissions of greenhouse gases from motor 
vehicles contribute to that endangerment. It is expected that 
the EPA will issue a rule by the end of March 2010 to control 
greenhouse gas emissions from light-duty vehicles such as 
automobiles. Once this rule is effective, greenhouse gases 
will, for the first time, be a regulated air pollutant under the 
Clean Air Act. The EPA has taken the position that the 
regulation of greenhouse gas emissions from new motor 
vehicles under the Clean Air Act will trigger the applicability of 
other Clean Air Act programs, such as the Title V Operating 
Permit Program and the NSR program, which apply to 
greenhouse gas emissions from stationary sources. This 
would include fossil fuel-fired electricity generating plants.  

Recognizing the difficulties presented by regulating at 

once virtually all emitters of greenhouse gases, the EPA 
announced in September 2009 a proposed rule, known as 
the “tailoring rule,” that would establish new higher thresholds 
for regulating greenhouse gas emissions from stationary 
sources, such as power plants. The rule would require any 
source that emits at least 25,000 tons per year of greenhouse 
gases measured as CO2 equivalents (CO2 e) to obtain an 
operating permit under Title V Operating Permit Program of  

the Clean Air Act. Sources that already have an operating 
permit would have greenhouse gas-specific provisions added 
to their permits upon renewal. Currently, all Ameren power 
plants have operating permits that, depending on the final 
rule, may be modified when they are renewed to address 
greenhouse gas emissions. The proposed tailoring rule also 
would set a new applicability threshold for subjecting 
stationary sources to the requirements of the NSR program 
for greenhouse gas emissions and a new emissions 
threshold for determining when modifications at such 
stationary sources would require the source to obtain a 
permit and to implement control technology to address 
greenhouse gas emissions.  

Future federal and state legislation or regulations that 

mandate limits on the emission of greenhouse gases would 
result in significant increases in capital expenditures and 
operating costs, which, in turn, could lead to increased 
liquidity needs and higher financing costs. Moreover, to the 
extent we request recovery of these costs through rates, our 
regulators might deny some or all of, or defer timely recovery 
of, these costs. Excessive costs to comply with future 
legislation or regulations might force UE, Genco, CILCO 
(through AERG) and EEI as well as other similarly situated 
electric power generators to close some coal-fired facilities 
and could lead to possible impairment of assets and reduced 
revenues. As a result, mandatory limits could have a material 
adverse impact on Ameren’s, UE’s, Genco’s, CILCO’s 
(through AERG) and EEI’s results of operations, financial 
position, and liquidity.  

The construction of, and capital improvements to, 

UE’s, CIPS’, CILCO’s and IP’s electric and gas utility 
infrastructure as well as to Genco’s, CILCO’s (through 
AERG) and EEI’s merchant generation facilities involve 
substantial risks. These risks include escalating costs, 
unsatisfactory performance by the projects when 
completed, the inability to complete projects as 
scheduled, cost disallowances by regulators and the 
inability to earn a reasonable rate of return on invested 
capital at our rate-regulated utilities, any of which could 
result in higher costs and the closure of facilities.  

Over the next five years, the Ameren Companies will 

incur significant capital expenditures to comply with 
environmental regulations and to make investments in their 
electric and gas utility infrastructure and their merchant 
generation facilities. The Ameren Companies estimate that 
they will incur up to $8.1 billion (UE – up to $4.2 billion; 
CIPS – up to $555 million; Genco – up to $1.0 billion; CILCO 
(Illinois Regulated) – up to $400 million; CILCO (AERG) – up 
to $180 million; IP – up to $1.1 billion; EEI – up to 
$460 million; Other – up to $220 million) of capital 
expenditures during the period 2010 through 2014. These 
expenses include construction expenditures, capitalized 
interest or allowance for funds used during construction, and 
compliance with environmental standards. Construction costs 
as well as the cost of capital have escalated in recent years 
and are expected to either stay at current levels or escalate 
further.  

17 

  
Investments in Ameren’s regulated operations are 
expected to be recoverable from ratepayers, but are subject 
to prudency reviews and regulatory lag. The recoverability of 
amounts expended in merchant generation operations will 
depend on whether market prices for power adjust to reflect 
increased costs for generators.  

The ability of the Ameren Companies to complete 
facilities under construction successfully, and to complete 
future projects within established estimates, is contingent 
upon many variables and subject to substantial risks. These 
variables include, but are not limited to, project management 
expertise and escalating costs for materials, labor, and 
environmental compliance. Delays in obtaining permits, 
shortages in materials and qualified labor, suppliers and 
contractors who do not perform as required under their 
contracts, changes in the scope and timing of projects, the 
inability to raise capital on favorable terms, or other events 
beyond our control may occur that may materially affect the 
schedule, cost and performance of these projects. With 
respect to capital spent for pollution control equipment, there 
is a risk that electric generating plants will not be permitted to 
continue to operate if pollution control equipment is not 
installed by prescribed deadlines or does not perform as 
expected. Should any such construction efforts be 
unsuccessful, the Ameren Companies could be subject to 
additional costs and to the loss of their investment in the 
project or facility. The Ameren Companies may also be 
required to purchase electricity for their customers until the 
projects are completed. All of these risks may have a material 
adverse effect on the Ameren Companies’ results of 
operations, financial position, and liquidity.  

Our counterparties may not meet their obligations to 

us.  

We are exposed to the risk that counterparties to various 

arrangements who owe us money, energy, coal, or other 
commodities or services will not be able to perform their 
obligations or, with respect to our credit facilities, will fail to 
honor their commitments. Should the counterparties to 
commodity arrangements fail to perform, we might be forced 
to replace or to sell the underlying commitment at then-
current market prices. Should the lenders under our credit 
facilities fail to perform, the level of borrowing capacity under 
those arrangements would decrease unless we were able to 
find replacement lenders to assume the nonperforming 
lender’s commitment. In such an event, we might incur 
losses, or our results of operations, financial position, and 
liquidity could otherwise be adversely affected.  

Certain of the Ameren Companies have obligations to 
other Ameren Companies or other Ameren subsidiaries as a 
result of transactions involving energy, coal, other 
commodities and services, and as a result of hedging 
transactions. If one Ameren entity failed to perform under any 
of these arrangements, other Ameren entities might incur 
losses. Their results of operations, financial position, and 
liquidity could be adversely affected, resulting in the 
nondefaulting Ameren entity being unable to meet its 
obligations, including to unrelated third parties.  

Increasing costs associated with our defined benefit 

and postretirement plans, health care plans, and other 
employee-related benefits could materially adversely 
affect our results of operations, financial position, and 
liquidity.  

We offer defined benefit and postretirement plans that 
cover substantially all of our employees. Assumptions related 
to future costs, returns on investments, interest rates, and 
other actuarial matters have a significant impact on our 
earnings and funding requirements. Ameren expects to fund 
its pension plans at a level equal to the greater of the pension 
expense or the legally required minimum contribution. 
Considering Ameren’s assumptions at December 31, 2009, 
its investment performance in 2009, and its pension funding 
policy, Ameren expects to make annual contributions of 
$75 million to $225 million in each of the next five years, with 
aggregate estimated contributions of $740 million. We expect 
UE’s, CIPS’, Genco’s, CILCO’s, and IP’s portion of the future 
funding requirements to be 66%, 6%, 9%, 9%, and 10%, 
respectively. These amounts are estimates. They may 
change with actual investment performance, changes in 
interest rates, changes in our assumptions, any pertinent 
changes in government regulations, and any voluntary 
contributions.  

In addition to the costs of our retirement plans, the costs 

of providing health care benefits to our employees and 
retirees have increased in recent years. We believe that our 
employee benefit costs, including costs of health care plans 
for our employees and former employees, will continue to 
rise. The increasing costs and funding requirements 
associated with our defined benefit retirement plans, health 
care plans, and other employee benefits could increase our 
financing needs and otherwise materially adversely affect our 
results of operations, financial position, and liquidity.  

Our electric generating, transmission and 

distribution facilities are subject to operational risks that 
could materially adversely affect our results of 
operations, financial position, and liquidity.  

The Ameren Companies’ financial performance depends 

on the successful operation of electric generating, 
transmission, and distribution facilities. Operation of electric 
generating, transmission, and distribution facilities involves 
many risks, including:  

 

 
 

 
 
 

 

 

 

facility shutdowns due to operator error or a failure of 
equipment or processes;  
longer-than-anticipated maintenance outages;  
disruptions in the delivery of fuel or lack of adequate 
inventories;  
lack of water for cooling plant operations;  
labor disputes;  
inability to comply with regulatory or permit requirements, 
including those relating to environmental contamination;  
disruptions in the delivery of electricity, including impacts 
on us or our customers;  
handling and storage of fossil-fuel combustion waste 
products, such as coal ash;  
unusual or adverse weather conditions, including severe 
storms, droughts, and floods;  

18 

  
  
 

 

 

 

a workplace accident that might result in injury or loss of 
life, extensive property damage, or environmental 
damage;  
information security risk, such as a breach of systems 
where sensitive utility customer data and account 
information are stored;  
catastrophic events such as fires, explosions, pandemic 
health events, or other similar occurrences; and  
other unanticipated operations and maintenance 
expenses and liabilities.  

Our natural gas distribution and storage activities 
involve numerous risks that may result in accidents and 
other operating risks and costs that could materially 
adversely affect our results of operations, financial 
position, and liquidity.  

Inherent in our natural gas distribution and storage 
activities are a variety of hazards and operating risks, such 
as leaks, accidental explosions and mechanical problems, 
which could cause substantial financial losses. In addition, 
these risks could result in serious injury to employees and 
nonemployees, loss of human life, significant damage to 
property, environmental pollution and impairment of our 
operations, which in turn could lead to substantial losses to 
us. In accordance with customary industry practice, we 
maintain insurance against some, but not all, of these risks 
and losses. The location of distribution lines and storage 
facilities near populated areas, including residential areas, 
commercial business centers, industrial sites, and other 
public gathering places, could increase the level of damages 
resulting from these risks. The occurrence of any of these 
events not fully covered by insurance could materially 
adversely affect our results of operations, financial position, 
and liquidity.  

Even though agreements have been reached with the 

state of Missouri and the FERC, the breach of the upper 
reservoir of UE’s Taum Sauk pumped-storage 
hydroelectric facility could continue to have a material 
adverse effect on Ameren’s and UE’s results of 
operations, liquidity, and financial condition.  

In December 2005, there was a breach of the upper 
reservoir at UE’s Taum Sauk pumped-storage hydroelectric 
facility. This resulted in significant flooding in the local area, 
which damaged a state park. UE settled with FERC and the 
state of Missouri all issues associated with the December 
2005 Taum Sauk incident.  

UE has property and liability insurance coverage for the 

Taum Sauk incident, subject to certain limits and deductibles. 
Insurance does not cover lost electric margins and penalties 
paid to FERC. UE expects that the total cost for cleanup, 
damage, and liabilities, excluding costs to rebuild the upper 
reservoir, will be approximately $205 million.  

UE received approval from FERC to rebuild the upper 

reservoir at its Taum Sauk plant and is in the process of 
testing the rebuilt facility. UE expects the Taum Sauk plant to 
become operational in the second quarter of 2010. The 
estimated cost to rebuild the upper reservoir is in the range of 
$490 million.  

Under UE’s insurance policies, all claims by or against 

UE are subject to review by its insurance carriers. In July 
2009, three insurance carriers filed a petition against Ameren 
in the Circuit Court of St. Louis County, Missouri, seeking a 
declaratory judgment that the property insurance policy does 
not require these three insurers to indemnify Ameren for their 
share of the entire cost of construction associated with the 
facility rebuild design being utilized. The three insurers allege 
that they, along with the other policy participants, presented a 
rebuild design that was consistent with their insurance 
coverage obligations and that the insurance policies do not 
require these insurers to pay their share of the costs of 
construction associated with the design being used. These 
insurers have estimated a cost of approximately $214 million 
for their rebuild design compared to the estimated 
$490 million cost of the design approved by FERC and 
implemented by Ameren. Ameren has filed an answer and 
counterclaim in the Circuit Court of St. Louis County, 
Missouri, against these insurers. The counterclaim asserts 
that the three insurance carriers have breached their 
obligations under the property insurance policies issued to 
Ameren and UE. Ameren seeks payment of a sum to-be-
determined for all amounts covered by these policies incurred 
in the facility rebuild, including power replacement costs, 
interest, and attorneys’ fees. The insurers that are parties to 
the litigation represent approximately 40%, on a weighted 
average basis, of the property insurance policy coverage 
between the disputed amounts of $214 million and $490 
million.  

Until Ameren’s remaining insurance claims and the 
related litigation are resolved, among other things, we are 
unable to determine the total impact the breach could have 
on Ameren’s and UE’s results of operations, financial 
position, and liquidity beyond those amounts already 
recognized. Ameren and UE expect to recover, through 
insurance, 80% to 90% of the total property insurance claim 
for the Taum Sauk incident. Beyond insurance, the 
recoverability of any Taum Sauk facility rebuild costs from 
customers is subject to the terms and conditions set forth in 
UE’s November 2007 State of Missouri settlement 
agreement. In that settlement, UE agreed that it would not 
attempt to recover from rate payers costs incurred in the 
reconstruction expressly excluding, however, enhancements, 
costs incurred due to circumstances or conditions that were 
not at that time reasonably foreseeable and costs that would 
have been incurred absent the Taum Sauk incident. Certain 
costs associated with the Taum Sauk facility not recovered 
from property insurers may be recoverable from UE’s electric 
customers through rates established in rate cases filed 
subsequent to the in-service date of the rebuilt facility. As of 
December 31, 2009, UE had capitalized in property and plant 
qualifying Taum Sauk-related costs of $99 million that UE 
believes qualify for potential recovery in electric rates under 
the terms of the November 2007 State of Missouri 
Settlement. The inclusion of such costs in UE’s electric rates 
is subject to review and approval by the MoPSC in a future 
rate case. Any amounts not recovered through insurance, in 
electric rates, or otherwise could result in charges to 
earnings, which could be material.  

19 

  
  
  
Genco’s, AERG’s, and EEI’s electric generating 

UE’s ownership and operation of a nuclear 

facilities must compete for the sale of energy and 
capacity, which exposes them to price risks.  

generating facility creates business, financial, and waste 
disposal risks.  

All of Genco’s, AERG’s, and EEI’s generating facilities 

compete for the sale of energy and capacity in the 
competitive energy markets.  

To the extent that electricity generated by these facilities 

is not under a fixed-price contract to be sold, the revenues 
and results of operations of these merchant subsidiaries 
generally depend on the prices that can be obtained for 
energy and capacity in Illinois and adjacent markets by 
Marketing Company.  

Market prices for energy and capacity may fluctuate 
substantially, sometimes over relatively short periods of time, 
and at other times experience sustained increases or 
decreases. Demand for electricity and fuel can fluctuate 
dramatically, creating periods of substantial under- or over-
supply. During periods of over-supply, prices might be 
depressed. Also, at times legislators or regulators with 
jurisdiction over wholesale and retail energy commodity and 
transportation rates may impose price limitations, bidding 
rules and other mechanisms to address volatility and other 
issues in these markets.  

For power products sold in advance, contract prices are 
influenced both by market conditions as well as the contract 
terms such as damage provisions, credit support 
requirements and the number of available counterparties 
interested in contracting for the desired forward period. 
Depending on differences between market factors at the time 
of contracting versus current conditions, Marketing 
Company’s contract portfolio may have average contract 
prices greater than or less than current market prices, 
including at the expiration of the contracts, which could 
significantly affect Ameren’s, Genco’s, AERG’s, and EEI’s 
results of operations, financial condition and liquidity.  

Among the factors that could influence such prices (all of 

which are beyond our control to a significant degree) are:  

 

 
 

 

 

 

 

 

 

 

current and future delivered market prices for natural 
gas, fuel oil, and coal, and related transportation costs;  
current and forward prices for the sale of electricity;  
the extent of additional supplies of electric energy from 
current competitors or new market entrants;  
the regulatory and market structures developed for 
evolving Midwest energy markets;  
changes enacted by the Illinois legislature, the ICC, the 
IPA, or other government agencies with respect to power 
procurement procedures;  
the potential for reregulation of generation in some 
states;  
future pricing for, and availability of, services on 
transmission systems, and the effect of RTOs and export 
energy transmission constraints, which could limit our 
ability to sell energy in our markets;  
the growth rate in electricity usage as a result of 
population changes, regional economic conditions, and 
the implementation of energy-efficiency programs;  
climate conditions in the Midwest market and major 
natural disasters; and  
environmental laws and regulations.  

UE’s ownership of the Callaway nuclear plant subjects it 

to the risks of nuclear generation, which include the following:  
 

potential harmful effects on the environment and human 
health resulting from the operation of nuclear facilities 
and the storage, handling and disposal of radioactive 
materials;  
the lack of a permanent waste storage site;  
limitations on the amounts and types of insurance 
commercially available to cover losses that might arise in 
connection with the Callaway nuclear plant or other U.S. 
nuclear operations;  
uncertainties with respect to contingencies and 
assessment amounts if insurance coverage is 
inadequate;  
public and governmental concerns over the adequacy of 
security at nuclear power plants;  
uncertainties with respect to the technological and 
financial aspects of decommissioning nuclear plants at 
the end of their licensed lives (UE’s facility operating 
license for the Callaway nuclear plant expires in 2024);  
limited availability of fuel supply; and  
costly and extended outages for scheduled or 
unscheduled maintenance and refueling.  
The NRC has broad authority under federal law to 

 
 

 

 

 

 
 

impose licensing and safety requirements for nuclear 
generation facilities. In the event of noncompliance, the NRC 
has the authority to impose fines, shut down a unit, or both, 
depending upon its assessment of the severity of the 
situation, until compliance is achieved. Revised safety 
requirements promulgated from time to time by the NRC 
could necessitate substantial capital expenditures at nuclear 
plants such as UE’s. In addition, if a serious nuclear incident 
were to occur, it could have a material but indeterminable 
adverse effect on UE’s results of operations, financial 
position, and liquidity. A major incident at a nuclear facility 
anywhere in the world could cause the NRC to limit or 
prohibit the operation or relicensing of any domestic nuclear 
unit.  

Our energy risk management strategies may not be 

effective in managing fuel and electricity procurement 
and pricing risks, which could result in unanticipated 
liabilities or increased volatility in our earnings and cash 
flows.  

We are exposed to changes in market prices for natural 
gas, fuel, electricity, emission allowances, and transmission 
congestion. Prices for natural gas, fuel, electricity, and 
emission allowances may fluctuate substantially over 
relatively short periods of time, and at other times experience 
sustained increases or decreases, and expose us to 
commodity price risk. We use short-term and long-term 
purchase and sales contracts in addition to derivatives such 
as forward contracts, futures contracts, options, and swaps to 
manage these risks. We attempt to manage our risk 
associated with these activities through enforcement of 
established risk limits and risk management procedures. We 
cannot ensure that these strategies will be successful in 
managing our pricing risk or that they will not result in net 
liabilities because of future volatility in these markets.  

20 

  
Although we routinely enter into contracts to hedge our 
exposure to the risks of demand and changes in commodity 
prices, we do not hedge the entire exposure of our operations 
from commodity price volatility. Furthermore, our ability to 
hedge our exposure to commodity price volatility depends on 
liquid commodity markets. To the extent that commodity 
markets are illiquid, we may not be able to execute our risk 
management strategies, which could result in greater 
unhedged positions than we would prefer at a given time. To 
the extent that unhedged positions exist, fluctuating 
commodity prices can adversely affect our results of 
operations, financial position, and liquidity.  

Our facilities are considered critical energy 
infrastructure and may therefore be targets of acts of 
terrorism.  

Like other electric and natural gas utilities and other 
merchant electric generators, our power generation plants, 
fuel storage facilities, and transmission and distribution 
facilities may be targets of terrorist activities that could result 
in disruption of our ability to produce or distribute some 
portion of our energy products. Any such disruption could 
result in a significant decrease in revenues or significant 
additional costs for repair, which could have a material 
adverse effect on our results of operations, financial position, 
and liquidity.  

Our businesses are dependent on our ability to 

access the capital markets successfully. We may not 
have access to sufficient capital in the amounts and at 
the times needed.  

We use short-term and long-term debt as a significant 
source of liquidity and funding for capital requirements not 
satisfied by our operating cash flow, including requirements 
related to future environmental compliance. As a result of 
rising costs and increased capital and operations and 
maintenance expenditures, coupled with near-term regulatory 
lag, we expect to continue to rely on short-term and long-term 
debt financing. Ameren intends to replace or extend its credit 
facility agreements during 2010. The inability to raise debt or 
equity capital on favorable terms, or at all, particularly during 
times of uncertainty in the capital markets, could negatively 
affect our ability to maintain and to expand our businesses. 
Our current credit ratings cause us to believe that we will 
continue to have access to the capital markets. However, 
events beyond our control, such as the extreme volatility and 
disruption in global debt or equity capital and credit markets 
that occurred in 2008 and continued into 2009, may create 
uncertainty that could increase our cost of capital or impair, 
or eliminate, our ability to access the debt, equity or credit 
markets, including the ability to draw on our bank credit 
facilities. Any adverse change in the Ameren Companies’ 
credit ratings may reduce access to capital and trigger 
additional collateral postings and prepayments. Such 
changes may also increase the cost of borrowing and fuel, 

ITEM  2.  PROPERTIES.  

power and gas supply, among other things, which could have 
a material adverse effect on our results of operations, 
financial position, and liquidity. Certain of the Ameren 
Companies rely, in part, on Ameren for access to capital. 
Circumstances that limit Ameren’s access to capital, 
including those relating to its other subsidiaries, could impair 
its ability to provide those Ameren Companies with needed 
capital.  

Ameren’s holding company structure could limit 

its ability to pay common stock dividends and to 
service its debt obligations.  

Ameren is a holding company; therefore, its primary 

assets are the common stock of its subsidiaries. As a 
result, Ameren’s ability to pay dividends on its common 
stock depends on the earnings of its subsidiaries and the 
ability of its subsidiaries to pay dividends or otherwise 
transfer funds to Ameren. Similarly, Ameren’s ability to 
service its debt obligations is also dependent upon the 
earnings of operating subsidiaries and the distribution of 
those earnings and other payments, including payments of 
principal and interest under intercompany indebtedness. 
The payment of dividends to Ameren by its subsidiaries in 
turn depends on their results of operations and cash flows 
and other items affecting retained earnings. Ameren’s 
subsidiaries are separate and distinct legal entities and 
have no obligation, contingent or otherwise, to pay any 
dividends or make any other distributions (except for 
payments required pursuant to the terms of intercompany 
borrowing arrangements) to Ameren. Certain of the 
Ameren Companies’ financing agreements and articles of 
incorporation, in addition to certain statutory and 
regulatory requirements, may impose restrictions on the 
ability of such Ameren Companies to transfer funds to 
Ameren in the form of cash dividends, loans or advances.  
Failure to retain and attract key officers and other 

skilled professional and technical employees could 
have an adverse effect on our operations.  

Our businesses depend upon our ability to employ 
and retain key officers and other skilled professional and 
technical employees. A significant portion of our work 
force is nearing retirement, including many employees 
with specialized skills such as maintaining and servicing 
our electric and natural gas infrastructure and operating 
our generating units. Our inability to retain and recruit 
qualified employees could adversely affect our results of 
operations.  

ITEM  1B.    UNRESOLVED STAFF COMMENTS.  

None.  

For information on our principal properties, see the generating facilities table below. See also Liquidity and Capital 

Resources and Regulatory Matters in Management’s Discussion and Analysis of Financial Condition and Results of Operations 
under Part II, Item 7, of this report for any planned additions, replacements or transfers. See also Note 5 – Long-term Debt and 
Equity Financings, and Note 15 – Commitments and Contingencies under Part II, Item 8, of this report. 

21 

 
  
The following table shows what our electric generating facilities and capability are anticipated to be at the time of our 

Location 

Net Kilowatt  Capability(a) 

expected 2010 peak summer electrical demand:  
Primary Fuel Source 

Missouri Regulated (UE): 
Coal .........................................................................................  

Total coal .................................................................................  
Nuclear ....................................................................................  
Hydroelectric ............................................................................  

Total hydroelectric ...................................................................  
Pumped-storage ......................................................................  
Oil (CTs) ..................................................................................  

Total oil ....................................................................................  
Natural gas (CTs) ....................................................................  

Plant 

Labadie 
Rush Island 
Sioux 
Meramec 

Callaway 
Osage 
Keokuk 

Taum Sauk(b) 
Meramec 
Fairgrounds 
Mexico 
Moberly 
Moreau 
Howard Bend 
Venice 

Audrain(d)  
Venice(e)  
Goose Creek 
Pinckneyville 
Raccoon Creek 
Kinmundy(e)  
Peno  Creek(d)(e) 
Meramec(e)  
Viaduct 
Kirksville 

Total natural gas ......................................................................  
Total UE .............................................................................  

Merchant Generation: 
Genco: 
Coal .........................................................................................  

Total coal .................................................................................  
Oil  

Total oil ....................................................................................  
Natural gas (CTs) ....................................................................  

Total natural gas ......................................................................  
Total Genco .......................................................................  

CILCO (through AERG): 
Coal .........................................................................................  

Total coal .................................................................................  
Total CILCO .......................................................................  

Medina Valley: 
Natural gas ..............................................................................  
Total Merchant Generation .......................................................  
Total Ameren .....................................................................  

Newton 
Joppa Generating Station  (EEI)(f) 
Coffeen 
Meredosia 
Hutsonville 

Meredosia 
Hutsonville (Diesel) 

Grand Tower 
Elgin 
Gibson City(e) 
Joppa 7B 
Columbia(g)  
Joppa (EEI)(f) 

Franklin County, Mo. 
Jefferson County, Mo. 
St. Charles County, Mo.   
St. Louis County, Mo. 

Callaway County, Mo. 
Lakeside, Mo. 
Keokuk, Ia. 

Reynolds County, Mo. 
St. Louis County, Mo. 
Jefferson City, Mo. 
Mexico, Mo. 
Moberly, Mo. 
Jefferson City, Mo. 
St. Louis County, Mo. 
Venice, Ill. 

Audrain County, Mo. 
Venice, Ill. 
Piatt County, Ill. 
Pinckneyville, Ill. 
Clay County, Ill. 
Kinmundy, Ill. 
Bowling Green, Mo. 
St. Louis County, Mo. 
Cape Girardeau, Mo. 
Kirksville, Mo. 

Newton, Ill. 
Joppa, Ill. 
Coffeen, Ill. 
Meredosia, Ill. 
Hutsonville, Ill. 

Meredosia, Ill. 
Hutsonville, Ill. 

Grand Tower, Ill. 
Elgin, Ill. 
Gibson City, Ill. 
Joppa, Ill. 
Columbia, Mo. 
Joppa, Ill. 

2,407,000  
1,204,000  
986,000  
839,000  
5,436,000  
1,190,000  
234,000  
137,000  
371,000  
440,000  
59,000  
55,000  
55,000  
55,000  
55,000  
43,000  
(c) 
322,000  
608,000  
491,000  
438,000  
316,000  
304,000  
208,000  
188,000  
53,000  
26,000  
13,000  
2,645,000  
10,404,000  

1,194,000  
1,002,000  
904,000  
203,000  
151,000  
3,454,000  
166,000  
3,000  
169,000  
511,000  
460,000  
228,000  
165,000  
140,000  
74,000  
1,578,000  
5,201,000  

715,000  
410,000  
1,125,000  
1,125,000  

44,000  
6,370,000  
16,774,000  

E.D. Edwards 
Duck Creek 

Bartonville, Ill. 
Canton, Ill. 

Medina Valley 

Mossville, Ill. 

22 

  
 
 
 
 
  
  
  
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
  
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
  
“Net Kilowatt Capability” is the generating capacity available for dispatch from the facility into the electric transmission grid.  

(a) 
(b)  This facility is not currently operational because of a breach of its upper reservoir in December 2005. It is expected to become operational in the second 

quarter of 2010 and therefore is expected to be available for the 2010 peak summer demand. For additional information on the Taum Sauk incident, see Note 
15 – Commitments and Contingencies under Part II, Item 8, of this report.  
(c)  This facility will be out of service in 2010.  
(d)  There are economic development lease arrangements applicable to these CTs.  
(e)  These CTs have the capability to operate on either oil or natural gas (dual fuel).  
(f)  Ameren owns an 80% interest in EEI. This table reflects the full capability of EEI’s facilities. As part of an internal reorganization, Resources Company 

transferred its 80% ownership interest in EEI to Genco, through a capital contribution, on January 1, 2010. See Part I, Item 1, Business and Note 1 – 
Summary of Significant Accounting Policies under Part II, Item 8, of this report.  

(g)  Genco and the city of Columbia, Missouri currently are parties to a power purchase agreement pursuant to which Columbia is now purchasing up to 72 

megawatts of capacity and energy generated by the facility. Genco has granted Columbia options to purchase an ownership interest in the facility, which 
would result in a sale of up to 72 megawatts (about 50%) of the facility. Columbia can exercise one option for 36 megawatts at the end of 2010 for a 
purchase price of $15.5 million, at the end of 2014 for a purchase price of $9.5 million, or at the end of 2020 for a purchase price of $4 million. The other 
option can be exercised for another 36 megawatts at the end of 2013 for a purchase price of $15.5 million, at the end of 2017 for a purchase price of $9.5 
million, or at the end of 2023 for a purchase price of $4 million. The purchase power agreement will terminate if Columbia exercises the purchase options. In 
addition, in February 2010, the city of Columbia approved the purchase of approximately 36 megawatts, or 25%, of the facility, subject to regulatory 
approvals. As part of this transaction, the structure of the first purchase option described above will be amended. Instead of the ability to exercise the option 
to purchase 36 megawatts at the end of 2010 for a purchase price of $15.5 million, the option could be exercised at the end of 2011 for a purchase price of 
$14.9 million. All other provisions of the options described above will remain the same.  
The following table presents electric and natural gas 

  The United States, the state of Illinois, the state of 
Iowa, or the city of Keokuk, Iowa, may own or may 
have paramount rights with respect to certain lands 
lying in the bed of the Mississippi River on which a 
portion of UE’s Keokuk plant is located.  
Substantially all of the properties and plant of UE, 
CIPS, CILCO and IP are subject to the first liens of the 
indentures securing their mortgage bonds.  

UE has conveyed most of its Peno Creek CT facility to 
the city of Bowling Green, Missouri, and leased the facility 
back from the city through 2022. Under the terms of this 
capital lease, UE is responsible for all operation and 
maintenance for the facility. Ownership of the facility will 
transfer to UE at the expiration of the lease, at which time 
the property and plant will become subject to the lien of 
any outstanding UE first mortgage bond indenture.  

UE operates a CT facility located in Audrain County, 
Missouri. UE has rights and obligations as lessee of the 
CT facility under a long-term lease with Audrain County. 
The lease term will expire on December 1, 2023. Under 
the terms of this capital lease, UE is responsible for all 
operation and maintenance for the facility. Ownership of 
the facility will transfer to UE at the expiration of the lease, 
at which time the property and plant will become subject to 
the lien of any outstanding UE first mortgage bond 
indenture.  

ITEM  3. LEGAL PROCEEDINGS.  

We are involved in legal and administrative 
proceedings before various courts and agencies with 
respect to matters that arise in the ordinary course of 
business, some of which involve substantial amounts of 
money. We believe that the final disposition of these 
proceedings, except as otherwise disclosed in this report,

utility-related properties for UE, CIPS, CILCO and IP as of 
December 31, 2009:  

UE 

Circuit miles of electric 

Circuit miles of electric 

transmission lines ...........      2,942  
distribution lines .............    33,012  

CIPS 
  2,306  
 14,929  

CILCO 
331  
  8,926  

IP 
  1,869   
  21,639   

Circuit miles of electric 
distribution lines 
underground ...................    

22% 

12%   

26%   

13% 

Miles of natural gas 
transmission and 
distribution mains ...........     3,259  
1  
-  

Propane-air plants ...............    
Underground gas storage 

fields ..............................    

  5,359  
1  
3  

  3,915  
-  
2  

  8,818   
-   
7   

Billion cubic feet of total 
working capacity of 
underground gas 
storage fields ..................    

-  

2  

8  

15   

Our other properties include office buildings, 

warehouses, garages, and repair shops.  

With only a few exceptions, we have fee title to all 
principal plants and other units of property material to the 
operation of our businesses, and to the real property on 
which such facilities are located (subject to mortgage liens 
securing our outstanding first mortgage bonds and credit 
facility indebtedness and to certain permitted liens and 
judgment liens). The exceptions are as follows:  
  A portion of UE’s Osage plant reservoir, certain 

facilities at UE’s Sioux plant, most of UE’s Peno Creek 
and Audrain CT facilities, Genco’s Columbia CT 
facility, Medina Valley’s generating facility, certain 
substations, and most transmission and distribution 
lines and gas mains are situated on lands occupied 
under leases, easements, franchises, licenses, or 
permits.  

  The United States or the state of Missouri may own or 
may have paramount rights to certain lands lying in the 
bed of the Osage River or located between the inner 
and outer harbor lines of the Mississippi River on 
which certain of UE’s generating and other properties 
are located.  

23 

  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
will not have a material adverse effect on our results of 
operations, financial position, or liquidity. Risk of loss is 
mitigated, in some cases, by insurance or contractual or 
statutory indemnification. We believe that we have 
established appropriate reserves for potential losses.  

In July 2009, Caterpillar Inc., in conjunction with other 
industrial customers as a coalition, intervened in the 2009 
rate cases filed by CILCO and IP with the ICC to modify its 
electric and natural gas delivery service rates. Douglas R. 
Oberhelman is an executive officer of Caterpillar Inc. and a 
member of the board of directors of Ameren. Mr. Oberhelman 

did not participate in Ameren Corporation’s board and 
committee deliberations relating to these matters.  

For additional information on legal and administrative 

proceedings, see Rates and Regulation under Item 1, 
Business, and Item 1A, Risk Factors, above. See also 
Liquidity and Capital Resources and Regulatory Matters in 
Management’s Discussion and Analysis of Financial 
Condition and Results of Operations under Part II, Item 7, 
and Note 2 – Rate and Regulatory Matters, and Note 15 – 
Commitments and Contingencies under Part II, Item 8, of this 
report.

ITEM  4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.  

There were no matters submitted to a vote of security holders during the fourth quarter of 2009 with respect to any of the 

Ameren Companies.  

EXECUTIVE OFFICERS OF THE REGISTRANTS (ITEM 401(b) OF REGULATION S-K):  

The executive officers of the Ameren Companies, including major subsidiaries, are listed below, along with their ages as of 
December 31, 2009, all positions and offices held with the Ameren Companies, tenure as officer, and business background for 
at least the last five years. Some executive officers hold multiple positions within the Ameren Companies; their titles are given in 
the description of their business experience.  

AMEREN CORPORATION:  

Age at 
12/31/09  Positions and Offices Held 

63 

Executive Chairman and Director 

Name  
Gary L. Rainwater 
Rainwater joined UE in 1979 and has held various positions with UE and other Ameren subsidiaries during his employment. In 
2004, Rainwater was elected to serve as chairman and chief executive officer of Ameren, UE, and Ameren Services in addition 
to his position as president. At that time, he was elected chairman of CILCO in addition to his position as chief executive officer 
and president of CILCO, which he assumed in 2003. In 2004, upon Ameren’s acquisition of IP, Rainwater was also elected 
chairman, chief executive officer, and president of IP. He held the position of chairman of CIPS, CILCO and IP after relinquishing 
his position as president in October 2004. In 2007, Rainwater relinquished his positions as chairman, president and chief 
executive officer of UE and Ameren Services and as chairman and chief executive officer of CIPS, CILCO and IP. In 2009, 
Rainwater was succeeded as president and chief executive officer of Ameren by Thomas R. Voss and will retire as executive 
chairman and director in April 2010. 

Thomas R. Voss 
Voss joined UE in 1969. He was elected senior vice president of UE, CIPS, and Ameren Services in 1999, of Genco in 2001, of 
CILCO in 2003, and of IP in 2004. In 2003, Voss was elected president of Genco; he relinquished his presidency of this 
company in 2004. In 2006, he was elected executive vice president of UE, CIPS, CILCO and IP. In 2007, Voss was elected 
chairman, president and chief executive officer of UE. He relinquished his positions at CIPS, CILCO and IP in 2007. In 2009, 
Voss was elected president and chief executive officer of Ameren; at that time, he relinquished his other positions. 

President and Chief Executive Officer, and Director 

62 

Martin J. Lyons, Jr. 
Lyons joined Ameren, UE, CIPS, Genco, and Ameren Services in 2001 as controller. He was elected controller of CILCO in 
2003. He was also elected vice president of Ameren, UE, CIPS, Genco, CILCO, and Ameren Services in 2003 and vice 
president and controller of IP in 2004. In 2007, his position at UE was changed to vice president and principal accounting officer. 
In 2008, Lyons was elected senior vice president and chief accounting officer of the Ameren Companies. In 2009, Lyons was 
also elected chief financial officer of the Ameren Companies. 

Senior Vice President and Chief Financial Officer 

43 

Steven R. Sullivan 
Sullivan joined Ameren, UE, CIPS, and Ameren Services in 1998 as vice president, general counsel, and secretary. He added 
those positions at Genco in 2000. In 2003, Sullivan was elected vice president, general counsel and secretary of CILCO. He was 
elected to his present position at Ameren, UE, CIPS, Genco, CILCO, and Ameren Services in 2003, and at IP in 2004. 

Senior Vice President, General Counsel and Secretary 

49 

Jerre E. Birdsong 
Birdsong joined UE in 1977 and was elected treasurer of UE in 1993. He was elected treasurer of Ameren, CIPS, and Ameren 
Services in 1997, and Genco in 2000. In addition to being treasurer, in 2001 he was elected vice president at Ameren and at the 
subsidiaries listed above. Additionally, he was elected vice president and treasurer of CILCO in 2003, and of IP in 2004. 

Vice President and Treasurer 

55 

24 

  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
SUBSIDIARIES:  

Age at 
12/31/09  Positions and Offices Held 

Name  
Warner L. Baxter 
Baxter joined UE in 1995. He was elected senior vice president, finance, of Ameren, UE, CIPS, Ameren Services, and 
Genco in 2001 and of CILCO in 2003. Baxter was elected to the position of executive vice president and chief financial 
officer of Ameren, UE, CIPS, Genco, CILCO, and Ameren Services in 2003 and of IP in 2004. He was elected chairman, 
chief executive officer, president, and chief financial officer of Ameren Services effective in 2007. In 2009, Baxter was 
elected chairman, president and chief executive officer of UE; at that time, he relinquished his other positions. 

Chairman, President and Chief Executive Officer (UE) 

48 

Scott A. Cisel 

Chairman, President and Chief Executive Officer (CIPS, CILCO 
and IP) 
Cisel joined CILCO in 1975. He was named senior vice president and leader of CILCO’s Sales and Marketing Business 
Unit in 2001. Cisel assumed the position of vice president and chief operating officer for CILCO in 2003, upon Ameren’s 
acquisition of that company. In 2004, Cisel was elected vice president of UE and president and chief operating officer of 
CIPS, CILCO and IP. In 2007, Cisel was elected chairman and chief executive officer of CIPS, CILCO and IP, in addition 
to his position as president. He relinquished his position at UE in 2007. 

56 

Daniel F. Cole 

Chairman, President and Chief Executive Officer (Ameren 
Services) 
Cole joined UE in 1976. He was elected senior vice president of UE and Ameren Services in 1999, and of CIPS in 2001. 
He was elected president of Genco in 2001; he relinquished that position in 2003. He was elected senior vice president of 
CILCO in 2003, and of IP in 2004. In 2009, Cole was elected chairman, president and chief executive officer of Ameren 
Services. 

56 

Karen C. Foss 
Foss joined UE in 2007 as vice president for public relations. She was elected senior vice president, communications and 
brand management, of Ameren Services in 2009. Foss relinquished her position at UE in 2009. Prior to joining UE, Foss 
was a news anchor at KSDK-TV in St. Louis, Missouri. 

Senior Vice President (Ameren Services) 

65 

Adam C. Heflin 
Heflin joined UE in 2005 as vice president of nuclear operations and was elected senior vice president and chief nuclear 
officer of UE in 2008. Prior to joining UE, Heflin served as Unit 2 plant manager at Arkansas Nuclear One, owned by 
Entergy Corporation. He joined Entergy Corporation’s nuclear operations in 1992. 

Senior Vice President and Chief Nuclear Officer (UE) 

45 

Richard J. Mark 
Mark joined Ameren Services in 2002 as vice president of customer service. In 2003, he was elected vice president of 
governmental policy and consumer affairs at Ameren Services, with responsibility for government affairs, economic 
development, and community relations for Ameren’s operating utility companies. He was elected senior vice president at 
UE in 2005, with responsibility for Missouri energy delivery. In 2007, Mark relinquished his position at Ameren Services. 

Senior Vice President (UE) 

54 

Michael L. Moehn 
Moehn joined Ameren Services in 2000. He was named director of Ameren Services’ corporate modeling and transaction 
support in 2001 and elected vice president of business services for Ameren Energy Resources Company in 2002. In 
2004, Moehn was elected vice president of corporate planning for Ameren Services and relinquished his position at 
Ameren Energy Resources Company. In 2008, he was elected senior vice president of Ameren Services. 

Senior Vice President (Ameren Services) 

40 

Michael G. Mueller 
Mueller joined UE in 1986. He was elected vice president of AFS in 2000 and president of AFS in 2004. 

President (AFS) 

46 

Charles D. Naslund 

57 

Chairman, President and Chief Executive Officer (Resources 
Company), and Chairman and President (Genco) 

Naslund joined UE in 1974. He was elected vice president of power operations at UE in 1999, vice president of Ameren 
Services in 2000, and vice president of nuclear operations at UE in 2004. He relinquished his position at Ameren Services 
in 2001. Naslund was elected senior vice president and chief nuclear officer at UE in 2005. In 2008, he was elected 
chairman, president and chief executive officer of Resources Company and chairman and president of Genco. Naslund 
relinquished his position at UE in 2008. 

President and Chief Executive Officer (Marketing Company) 
Andrew M. Serri 
Serri joined Marketing Company as vice president of sales and marketing in 2000. He was elected vice president of 
marketing and trading of Ameren Services in 2004, before being elected president and chief executive officer of Marketing 
Company that same year. He relinquished his position at Ameren Services in 2007. 

48 

25 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Officers are generally elected or appointed annually by the respective board of directors of each company, following 
the election of board members at the annual meetings of shareholders. No special arrangement or understanding exists 
between any of the above-named executive officers and the Ameren Companies nor, to our knowledge, with any other 
person or persons pursuant to which any executive officer was selected as an officer. There are no family relationships 
among the officers. Except for Karen C. Foss and Adam C. Heflin, all of the above-named executive officers have been 
employed by an Ameren company for more than five years in executive or management positions.  

PART II  

ITEM  5.  MARKET FOR REGISTRANTS’ COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER 

PURCHASES OF EQUITY SECURITIES.  

Ameren’s common stock is listed on the NYSE (ticker symbol: AEE). Ameren common shareholders of record totaled 
69,881 on January 29, 2010. The following table presents the price ranges, closing prices, and dividends paid per Ameren 
common share for each quarter during 2009 and 2008.  

AEE 2009 Quarter Ended: 

March 31 .........................................................................  
June 30 ...........................................................................  
September 30 .................................................................  
December 31 ..................................................................  

AEE 2008 Quarter Ended: 

March 31 .........................................................................  
June 30 ...........................................................................  
September 30 .................................................................  
December 31 ..................................................................  

High 

Low 

Close 

Dividends Paid 

$ 

$ 

35.35   
25.25   
27.66   
28.67   

54.29   
48.39   
43.16   
39.15   

$ 

$ 

19.51 
21.75 
23.09 
23.78 

40.92 
41.34 
38.49 
25.51 

$ 

$ 

23.19 
24.89 
25.28 
27.95 

44.04 
42.23 
39.03 
33.26 

38 1 /2 ¢ 
38 1 /2   
38 1 /2   
38 1 /2   

63  1/2 ¢ 
63  1/2   
63  1/2   
63  1/2   

There is no trading market for the common stock of UE, CIPS, Genco, CILCO or IP. Ameren holds all outstanding 

common stock of UE, CIPS and IP; Resources Company holds all outstanding common stock of Genco; and CILCORP 
holds all outstanding common stock of CILCO.  

The following table sets forth the quarterly common stock dividend payments made by Ameren and its subsidiaries 

during 2009 and 2008:  
(In millions) 

2009 
Quarter Ended  

2008 
Quarter Ended  

Registrant 
UE  ..................................  
CIPS ................................  
Genco ..............................  
CILCO .............................  
IP   ..................................  
Nonregistrants .................  
Ameren ............................  

December 31 
5   
$ 
35   
-   
20   
31   
-   
$     91   

September 30 
71   
$ 
12   
-   
-   
-   
-   
$       83   

June 30 
47   
$ 
-   
-   
-   
-   
35   
$       82   

March 31 
52 
$ 
- 
- 
- 
- 
30 
$         82 

$ 

December 31 
71   
-   
17   
-   
15   
32   
$       135    

$ 

September 30 
88   
-   
-   
-   
15   
30   
$        133    

June 30 
28 
$ 
- 
60 
- 
15 
30 
$     133 

March 31 
77 
$ 
- 
24 
- 
15 
17 
$       133 

On February 12, 2010, the board of directors of Ameren declared a quarterly dividend on Ameren’s common stock of 

38.5 cents per share. The common share dividend is payable March 31, 2010, to stockholders of record on March 10, 
2010.  

For a discussion of restrictions on the Ameren Companies’ payment of dividends, see Liquidity and Capital Resources 

in Management’s Discussion and Analysis of Financial Condition and Results of Operations under Part II, Item 7, of this 
report.  

26 

  
 
 
 
 
 
 
  
  
  
  
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
  
  
  
  
 
   
 
 
 
 
   
 
 
 
 
   
 
 
 
 
   
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
Purchase of Equity Securities  

The following table presents Ameren Corporation’s purchases of equity securities reportable under Item 703 of 

Regulation S-K:  

Period 
October 1 – October 31, 2009 ........................    
November 1 – November 30, 2009 .................    
December 1 – December 31, 2009 .................    
Total ..............................................................    

(a) Total Number 
of Shares (or  Units) 
Purchased(a) 
- 
2,368 
5,928 
8,296 

(b) Average Price 
Paid per Share 
(or Unit)  
 - 
$ 
25.77 
27.95 
$  27.33 

(c) Total Number of Shares 
(or Units) Purchased as 
Part of Publicly 
Announced 
Plans or Programs 
- 
- 
- 
- 

(d) Maximum Number 
(or Approximate Dollar Value) 
of Shares (or Units) that May  Yet 
Be Purchased Under the 
Plans or Programs 
- 
- 
- 
- 

(a) 

Included in December were 2,850 shares of Ameren common stock purchased by Ameren in open-market transactions pursuant to Ameren’s 2006 Omnibus 
Incentive Compensation Plan in satisfaction of Ameren’s obligations for Ameren board of directors’ compensation awards. The remaining shares of Ameren 
common stock were purchased by Ameren in open-market transactions pursuant to Ameren’s 2006 Omnibus Incentive Compensation Plan in satisfaction of 
Ameren’s obligation to distribute shares of common stock for vested performance units. Ameren does not have any publicly announced equity securities 
repurchase plans or programs.  
None of the other registrants purchased equity securities reportable under Item 703 of Regulation S-K during the 

period from October 1, 2009 to December 31, 2009.  

Performance Graph  

The following graph shows Ameren’s cumulative total shareholder return during the five years ended December 31, 
2009. The graph also shows the cumulative total returns of the S&P 500 Index and the Edison Electric Institute Index (EEI 
Index), which comprises most investor-owned electric utilities in the United States. The comparison assumes that $100 
was invested on December 31, 2004, in Ameren common stock and in each of the indices shown, and it assumes that all 
of the dividends were reinvested.  

December 31, 
Ameren ...................................................................................  
S&P 500 Index ........................................................................  
EEI Index ................................................................................  

2004 
$      100  
100  
100  

2005 
$      107.26  
104.91  
116.05  

2006 
$      118.11  
121.48  
140.14  

2007 
$      125.12  
128.14  
163.35  

$ 

2008 

81.84  
80.73  
    121.04  

$ 

2009 
73.08 
102.09 
      134.01 

Ameren management cautions that the stock price performance shown in the graph above should not be considered 

indicative of potential future stock price performance.  

27 

  
 
 
 
 
 
 
   
   
 
 
 
   
   
 
 
 
   
   
 
 
   
   
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
UE: 

ITEM  6.  SELECTED FINANCIAL DATA.  
For the years ended December 31, 
(In millions, except per share amounts) 
Ameren: 

Operating revenues(a) .............................................................  
Operating income(a) ................................................................  
Net income attributable to Ameren Corporation(a) ....................  
Common stock dividends........................................................  
Earnings per share – basic and diluted(a) ................................  
Common stock dividends per share ........................................   

As of December 31: 

Total assets ............................................................................  
Long-term debt, excluding current maturities ..........................  
Preferred stock subject to mandatory redemption ...................  
Total Ameren Corporation stockholders’ equity .......................  

CIPS: 

Operating revenues ................................................................  
Operating income ...................................................................  
Net income available to common stockholder .........................  
Dividends to parent ................................................................  

As of December 31: 

Total assets ............................................................................  
Long-term debt, excluding current maturities ..........................  
Total stockholders’ equity .......................................................   

Operating revenues ................................................................  
Operating income ...................................................................  
Net income available to common stockholder .........................  
Dividends to parent ................................................................  

As of December 31: 

Total assets ............................................................................  
Long-term debt, excluding current maturities ..........................  
Total stockholders’ equity .......................................................   

Genco: 

As of December 31: 

Operating revenues ................................................................  
Operating income ...................................................................  
Net income .............................................................................  
Dividends to parent ................................................................  

Total assets ............................................................................  
Long-term debt, excluding current maturities ..........................  
Subordinated intercompany notes (current and  long-term) .....  
Total stockholder’s equity .......................................................   

CILCO:  

As of December 31: 

Operating revenues ................................................................  
Operating income ...................................................................  
Net income available to common stockholder .........................  
Dividends to parent ................................................................  

Total assets ............................................................................  
Long-term debt, excluding current maturities ..........................  
Preferred stock subject to mandatory redemption ...................  
Total stockholders’ equity .......................................................   

As of December 31: 

Operating revenues ................................................................  
Operating income ...................................................................  
Net income available to common stockholder .........................  
Dividends to parent ................................................................  

Total assets ............................................................................  
Long-term debt, excluding current maturities ..........................  
Long-term debt to IP SPT, excluding current maturities...........  
Total stockholders’ equity .......................................................   

IP: 

2009 

2008 

2007 

2006 

2005 

$ 

$ 

7,090  
1,416  
612  
338  
2.78  
1.54  

$ 

7,839  
1,362  
605  
534  
2.88  
2.54  

7,562  
1,359  
618  
527  
2.98  
2.54  

$ 

6,895  
1,188  
547  
522  
2.66  
2.54  

$ 

6,780   
1,284   
606 (b) 
511   
3.02 (b) 
2.54   

$       23,790  
7,113  
-  
7,853  

$       22,671  
6,554  
-  
6,963  

$       20,752  
5,689  
16  
6,752  

$       19,662  
5,285  
17  
6,583  

$      18,171   
5,354   
19   
6,364   

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

2,960  
514  
245  
264  

11,529  
3,673  
3,562  

982  
42  
12  
-  

1,920  
421  
529  

908  
330  
175  
101  

2,244  
774  
87  
695  

1,147  
132  
68  
-  

2,296  
279  
-  
684  

1,696  
103  
3  
60  

3,770  
1,150  
-  
1,251  

2,961  
590  
336  
267  

10,903  
3,208  
3,601  

1,005  
49  
14  
40  

1,866  
456  
517  

876  
258  
125  
113  

1,968  
474  
126  
648  

1,011  
143  
74  
-  

1,867  
148  
16  
622  

1,646  
109  
24  
61  

3,331  
1,014  
-  
1,308  

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

2,823  
620  
343  
249  

10,290  
2,934  
3,153  

954  
69  
35  
50  

1,861  
471  
543  

992  
131  
49  
113  

1,850  
474  
163  
563  

747  
78  
45  
65  

1,656  
148  
17  
535  

1,694  
141  
55  
-  

3,227  
772  
92  
1,346  

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

2,889   
640   
346   
280   

9,277   
2,698   
3,016   

934   
85   
41   
35   

1,784   
410   
569   

1,038   
257   
97 (b) 
88   

1,811   
474   
197   
444   

742   
63   
24 (b) 
20   

1,557   
122   
19   
562   

1,653   
202   
95   
76   

3,056   
704   
184   
1,287   

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

2,874  
566  
259  
175  

12,301  
4,018  
4,057  

869  
68  
26  
47  

1,965  
421  
574  

850  
310  
155  
-  

2,535  
823  
45  
862  

1,082  
252  
134  
20  

2,382  
279  
-  
855  

1,504  
230  
77  
31  

3,942  
1,147  
-  
1,451  

28 

  
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
(a) 
(b) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  
Included income (loss) from cumulative effect of change in accounting principle of $(22) million ($(0.11) per share) for Ameren, $(16) million for Genco, and 
$(2) million for CILCO.  

ITEM  7.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF 

OPERATIONS.  

OVERVIEW  
Ameren Executive Summary  
Operations  

At Ameren’s rate-regulated utilities, milder weather and 

the economic slowdown led to a 3% decrease in 
kilowatthour sales to residential and commercial customers 
in 2009, compared with 2008. However, this sales decline 
was smaller, an estimated 1%, on a weather-normalized 
basis. The weak economy also led to a decline in 
kilowatthour sales by Ameren’s rate-regulated utilities to 
their industrial customers. These sales declined 11% in 
2009, compared with 2008, excluding the impact of reduced 
sales to Noranda’s smelter plant in New Madrid, Missouri. 
Noranda’s plant sustained damage because of a power 
interruption on non-Ameren-owned power lines during a 
severe ice storm in January 2009. As a result, the smelter’s 
load was sharply reduced but has been rising steadily as 
repairs have been made to the smelter plant’s production 
lines, with full production expected to be reached in the 
second quarter of 2010. Electric sales to industrial 
customers, including Noranda, declined 17% in 2009, 
compared with 2008.  

For several years, Ameren’s rate-regulated utility 
businesses have been earning returns on investment that 
are well below their authorized levels, in part, due to 
regulatory lag. Ameren is focused on improving earnings to 
levels that represent fair returns on its rate-regulated 
investments. Ameren has rate cases pending in both its 
Illinois and Missouri jurisdictions. Ameren is seeking 
revenue levels that reflect the significant investments it has 
made in electric and gas utility infrastructure to improve 
reliability. Ameren is also seeking recovery of higher 
financing costs and, in Missouri, rising net fuel costs. The 
Ameren Illinois Utilities are currently requesting a $130 
million aggregate annual increase in base electric and 
natural gas delivery rates. The staff of the ICC currently 
supports a $46 million annual revenue increase. The staff’s 
lower revenue amount reflects its lower recommended 
return on equity of 10.1% compared to the Ameren Illinois 
Utilities’ request of 11.5%, on a rate base weighted basis, 
and use of a lower pension and benefits expense level, 
among other things. In February 2010, administrative law 
judges issued a consolidated proposed order, which 
included a recommended revenue increase for electric 
delivery service for the Ameren Illinois Utilities of $66 million 
in the aggregate (CIPS – $26 million increase, CILCO – $6 
million increase, and IP - $34 million increase) and a 
recommended revenue net decrease for natural gas 
delivery service of $10 million in the aggregate (CIPS – $1 
million increase, CILCO – $6 million decrease, and IP - $5 
million decrease). The ICC is not bound by the proposed 
order issued by the administrative law judges. New rates 
should be effective by early May 2010.  

UE filed a request with the MoPSC in July 2009 for an 
annual electric service rate increase of $402 million. More 
than half of the request was for anticipated higher net fuel 
costs. These increased net fuel costs would have been 
eligible for recovery through the FAC absent this filing. The 
MoPSC staff, in its direct testimony in the rate case, 
recommended an annual electric service rate increase of 
$218 million to $251 million, with approximately $214 million 
of this related to higher net fuel costs. The staff’s lower 
revenue amount reflects its lower recommended return on 
equity range of 9.0% to 9.7%, which was lower than UE’s 
initial request of 11.5%. The staff’s revenue amount also 
incorporated lower depreciation, plant maintenance and 
financing cost levels, as well as other adjustments. The 
staff testimony reflects continuation of the FAC and the 
pension and postretirement benefit cost trackers and a 
modified environmental cost recovery mechanism. Other 
parties filed testimony in the rate case, including a group of 
large industrial customers and the Office of Public Counsel. 
The Missouri Office of Public Counsel recommended a 
return on equity of 10.2%. The large industrial customers 
recommended a rate increase of $139 million, which 
included a $181 million increase related to net fuel costs. 
Their lower revenue requirement reflects their lower 
recommended return on equity of 10%, the use of 
significantly lower depreciation rates and plant maintenance 
expenses, as well as lower financing costs, among other 
things. The large industrial customers’ testimony reflects 
continuation of the FAC, as well as a modified approach for 
the accounting and recovery of environmental costs. In 
February 2010, UE filed its rebuttal testimony in this rate 
case, which included, among other things, a modification of 
its recommended return on equity to 10.8%. It is anticipated 
that certain major changes to revenues, expenses, rate 
base, and capital structure will be trued-up through January 
31, 2010, in a March 2010 UE update. A MoPSC order is 
expected by late May 2010 with new rates expected to be 
effective in late June 2010.  

Current lower power prices are very much linked to 
weak economic conditions. Weak economic conditions 
have reduced the demand for power and other energy 
commodities. Ameren believes that when the economy 
recovers, these prices should rise. In the meantime, 
Ameren continues to look for opportunities to prudently 
reduce operating and capital spending in the Merchant 
Generation business, as well as protect and enhance 
margins. Ameren’s Merchant Generation business output is 
significantly hedged over the next few years. Such hedging 
protects credit quality and reduces earnings and cash flow 
volatility. In addition, Ameren continues to focus on 
providing value-added electricity products to the market.

29 

  
  
  
Leveraging Ameren’s competitive merchant generating 
assets, Marketing Company has a track record of enhancing 
margins through sales to wholesale and retail customers. To 
strengthen Merchant Generation’s ability to successfully 
weather current lower power prices, Ameren has reduced 
planned operating and capital spending, improving the cash 
flow outlook for the Merchant Generation business. Ameren 
continues to evaluate Merchant Generation’s spending plans 
in light of changing technologies, power prices and delivered 
fuel costs in order to ensure that the lowest cost options are 
identified in terms of both capital and ongoing operating 
costs.  

Between 2010 and 2017, Ameren expects that certain 
Ameren Companies will be required to make cumulative 
investments of between $1.6 billion and $1.9 billion to retrofit 
their coal-fired power plants with pollution control equipment 
in compliance with existing emissions-related environmental 
laws and regulations. Any pollution control investments will 
result in decreased plant availability during construction and 
higher ongoing operating expenses. Approximately 20% of 
this investment is expected to be in Ameren’s Missouri 
Regulated operations, and it is therefore expected to be 
recoverable from ratepayers, but subject to prudency 
reviews.  

Earnings  

Ameren reported net income of $612 million, or $2.78 per 
share, for 2009 compared with net income of $605 million, or 
$2.88 per share, in 2008. Factors contributing to the 10 cent 
decline in earnings per share in 2009 compared with 2008 
included lower electricity and natural gas sales in Ameren’s 
rate-regulated businesses and lower margins in its Merchant 
Generation business, as a result of weak economic 
conditions, milder 2009 weather and, in the Missouri 
Regulated business, the impact of reduced sales to Noranda. 
Higher depreciation and interest expense, the absence in 
2009 of the benefit of a lump-sum payment from a coal 
supplier for higher fuel costs in 2009 as a result of a 
premature mine closure and contract termination, and an 
increased average number of common shares outstanding 
also affected comparative results. Offsetting factors included 
new utility rates in Illinois and Missouri, favorable unrealized 
MTM activity on derivatives, and lower operations and 
maintenance expenses due, in part, to the absence of a 
refueling and maintenance outage at the Callaway nuclear 
plant in 2009.  

Liquidity  

As a result of turmoil in the capital and credit markets in 
2008 and 2009, we sought to improve our liquidity position. 
We replaced and extended the expiration of our credit 
facilities and sought to reduce our reliance on borrowings 
from these credit facilities, increase cash balances and 
increase the equity content of our capitalization. We also 
sought to eliminate debt at CILCORP as a step in simplifying 
our organizational structure. In addition, Ameren also 
reduced planned spending, headcount and capital investment 
across the company to mitigate the negative impact on sales 
of a weak economy and related power prices. At December 
31, 2009, Ameren, on a consolidated basis, had available 
liquidity, in the form of cash on hand and amounts available 
under its existing credit facilities, of approximately 
$1.9 billion, which was $0.6 billion more than it had at the end 
of 2008. Cash flows from operations of $2.0 billion in 2009 at 
Ameren, along with other funds, were used to pay dividends 
to common shareholders of $338 million and to fund capital 
expenditures of $1.7 billion.  

Capital Spending  

During 2009, Ameren was able to significantly defer or 

reduce planned capital spending, including spending for 
environmental compliance, compared with previous plans.  

Initiatives to limit greenhouse gas emissions and to 

address global climate change are subject to active 
consideration in the U.S. Congress. Although we cannot 
predict the date of enactment or the requirements of any 
future climate change legislation or regulations, we believe it 
is possible that some form of federal legislation or regulations 
to control emissions of greenhouse gases will become law 
during President Obama’s administration. Potential impacts 
from the climate change legislation could vary depending 
upon proposed CO2 emission limits, the timing of 
implementation of those limits, the method of distributing 
allowances, the degree to which offsets are allowed and 
available, and provisions for cost containment measures. 
Future federal and state legislation or regulations that 
mandate limits on the emission of greenhouse gases would 
result in significant increases in capital expenditures and 
operating costs, which, in turn, could lead to increased 
liquidity needs and higher financing costs. Moreover, to the 
extent Ameren requests recovery of these costs through 
rates, its regulators might deny some or all of, or defer timely 
recovery of, these costs. Excessive costs to comply with 
future legislation or regulations might force UE, Genco, 
CILCO (through AERG) and EEI and other similarly-situated 
electric power generators to close some coal-fired facilities, 
and it could lead to possible impairment of assets and 
reduced revenues. As a result, mandatory limits could have a 
material adverse impact on Ameren’s, UE’s, Genco’s, 
CILCO’s (through AERG) and EEI’s results of operations, 
financial position, or liquidity.  

General  

Ameren, headquartered in St. Louis, Missouri, is a public 
utility holding company under PUHCA 2005, administered by 
FERC. Ameren’s primary assets are the common stock of its 
subsidiaries. Ameren’s subsidiaries are separate, 
independent legal entities with separate businesses, assets, 
and liabilities. These subsidiaries operate, as the case may 
be, rate-regulated electric generation, transmission, and 
distribution businesses, rate-regulated natural gas 
transmission and distribution businesses, and merchant 
electric generation businesses in Missouri and Illinois. 
Dividends on Ameren’s common stock and the payment of 
other expenses by Ameren depend on distributions made to it 
by its subsidiaries. See Note 1 – Summary of Significant 
Accounting Policies under Part II, Item 8, of this report for a 
detailed description of our principal subsidiaries.  

  UE operates a rate-regulated electric generation, 
transmission and distribution business, and a rate-

30 

 
  
regulated natural gas transmission and distribution 
business in Missouri.  

  CIPS operates a rate-regulated electric and natural gas 
transmission and distribution business in Illinois.  

  Genco operates a merchant electric generation business 

in Illinois and Missouri.  

  CILCO operates a rate-regulated electric transmission 

and distribution business, a merchant electric generation 
business (through its subsidiary, AERG), and a rate-
regulated natural gas transmission and distribution 
business, all in Illinois.  
IP operates a rate-regulated electric and natural gas 
transmission and distribution business in Illinois.  

 

The financial statements of Ameren are prepared on a 
consolidated basis and therefore include the accounts of its 
majority-owned subsidiaries. All significant intercompany 
transactions have been eliminated. All tabular dollar amounts 
are expressed in millions, unless otherwise indicated.  

In addition to presenting results of operations and 
earnings amounts in total, we present certain information in 
cents per share. These amounts reflect factors that directly 
affect Ameren’s earnings. We believe this per share 
information helps readers to understand the impact of these 
factors on Ameren’s earnings per share. All references in this 
report to earnings per share are based on average diluted 
common shares outstanding during the applicable year.  

RESULTS OF OPERATIONS  

Earnings Summary  

Our results of operations and financial position are 
affected by many factors. Weather, economic conditions, and 
the actions of key customers or competitors can significantly 
affect the demand for our services. Our results are also 
affected by seasonal fluctuations: winter heating and summer 
cooling demands. The vast majority of Ameren’s revenues 
are subject to state or federal regulation. This regulation has 
a material impact on the price we charge for our services. 
Merchant Generation sales are also subject to market 
conditions for power. We principally use coal, nuclear fuel, 
natural gas, and oil for fuel in our operations. The prices for 
these commodities can fluctuate significantly due to the 
global economic and political environment, weather, supply 
and demand, and many other factors. We have natural gas 
cost recovery mechanisms for our Illinois and Missouri gas 
delivery service businesses, purchased power cost recovery 
mechanisms for our Illinois electric delivery service 
businesses, and a FAC for our Missouri electric utility 
business. See Note 2 – Rate and Regulatory Matters under 
Part II, Item 8, for a discussion of pending rate cases in 
Missouri and Illinois, including UE’s request for approval to 
implement an environmental cost recovery mechanism and to 
continue its FAC. Fluctuations in interest rates and conditions 
in the capital and credit markets affect our cost of borrowing 
and our pension and postretirement benefits costs. We 
employ various risk management strategies to reduce our 
exposure to commodity risk and other risks inherent in our 
business. The reliability of our power plants and transmission 
and distribution systems and the level of purchased power  

costs, operating and administrative costs, and capital 
investment are key factors that we seek to control to optimize 
our results of operations, financial position, and liquidity.  

Net income attributable to Ameren Corporation was $612 

million, or $2.78 per share, for 2009, $605 million, or $2.88 
per share for 2008, and $618 million, or $2.98 per share, for 
2007.  

Net income attributable to Ameren Corporation increased 

$7 million and its earnings per share decreased 10 cents in 
2009 compared with 2008. Net income attributable to Ameren 
Corporation increased in the Illinois Regulated and Missouri 
Regulated segments by $92 million and $25 million, 
respectively, in 2009 compared with 2008, while net income 
attributable to Ameren Corporation in the Merchant 
Generation segment decreased by $105 million in 2009 
compared with 2008.  

Compared with 2008 earnings, 2009 earnings were 

negatively affected by:  

 
 

 

 

 

 

 

 

 

 

 

higher dilution and financing costs (31 cents per share);  
the impact on electric and natural gas margins in our 
rate-regulated businesses of higher net fuel costs at UE 
and lower demand (exclusive of weather impacts), 
among other things (30 cents per share);  
the absence in 2009 of the benefit of a settlement 
agreement reached with a coal mine owner that 
reimbursed Genco, in the form of a lump-sum payment, 
for increased costs for coal and transportation incurred in 
2008 and 2009 due to the premature closure of an Illinois 
mine and contract termination (18 cents per share);  
the impact of milder weather conditions on energy 
demand (estimated at 15 cents per share);  
increased depreciation and amortization expenses 
(12 cents per share);  
reduced sales to Noranda because of an extended 
storm-related outage (11 cents per share);  
the absence in 2009 of a MoPSC rate order establishing 
two separate regulatory assets for previously incurred 
storm and MISO related costs (11 cents per share);  
increased expense related to work force reductions 
through voluntary and involuntary separation programs 
and asset impairment charges recorded primarily at 
Genco in 2009 (7 cents per share);  
increased taxes other than income taxes, primarily 
because of higher property taxes (6 cents per share);  
lower realized electric margins in the Merchant 
Generation segment largely due to lower sales volumes 
and higher fuel and related transportation costs (5 cents 
per share); and  
increased distribution system reliability expenditures 
(5 cents per share).  

Compared with 2008 earnings, 2009 earnings were 

favorably affected by:  

 

higher electric and natural gas delivery service rates, 
effective October 1, 2008, in the Illinois Regulated 
segment pursuant to an ICC consolidated rate order for 

31 

 
  
CIPS, CILCO and IP (40 cents per share);  

 

  higher electric rates, effective March 1, 2009, in the 
Missouri Regulated segment pursuant to a MoPSC 
rate order (40 cents per share);  
favorable net unrealized MTM activity on derivatives 
and from changes in the market value of investments 
used to support Ameren’s deferred compensation 
plans (21 cents per share);  

Trails and Sterling Avenue generation facilities to their 
estimated fair values as of December 31, 2008 (6 
cents per share);  
increased depreciation and amortization expenses 
(6 cents per share);  
the absence in 2008 of the reversal, recorded in 2007, 
of the Illinois Customer Elect electric rate increase 
phase-in plan accrual (5 cents per share);  

 

 

  decreased plant operations and maintenance expense 

  higher labor and employee benefit costs (5 cents per 

share); and  

  higher bad debt expenses (3 cents per share).  

Compared with 2007 earnings, 2008 earnings were 

favorably affected by:  
  higher realized electric margins in the Merchant 

 

 

 

Generation segment;  
the absence in 2008 of costs that were incurred in 
January 2007 associated with electric outages caused 
by severe ice storms, and the amount of these costs 
that UE will recover as a result of an accounting order 
issued by the MoPSC, which was recorded as a 
regulatory asset in 2008 (16 cents per share);  
the reduced impact in 2008 of the electric rate relief 
and customer assistance programs provided to certain 
Ameren Illinois Utilities electric customers under the 
2007 Illinois Electric Settlement Agreement (13 cents 
per share);  
the absence in 2008 of a March 2007 FERC order that 
resettled costs among MISO market participants 
retroactive to 2005 that was recorded in 2007, and the 
subsequent recovery of a portion of these costs in 
2008, through a MoPSC order (10 cents per share);  
  higher electric and natural gas delivery service rates in 
the Illinois Regulated segment pursuant to the ICC 
consolidated rate order for CIPS, CILCO, and IP 
issued in September 2008 (9 cents per share);  
the benefit of a settlement agreement with a coal mine 
owner reached in June 2008 that reimbursed Genco, 
in the form of a lump-sum payment, for increased 
costs for coal and transportation that it expected to 
incur in 2009 due to the premature closure of an 
Illinois mine and contract termination (8 cents per 
share);  

 

  higher electric rates, lower depreciation expense, and 

 

decreased income tax expense in the Missouri 
Regulated segment pursuant to the MoPSC electric 
rate order for UE issued in May 2007 (8 cents per 
share); and  
the reduced impact of the Callaway nuclear plant 
refueling and maintenance outage in 2008, as 
compared with the prior-year refueling and 
maintenance outage (4 cents per share).  
The cents per share information presented above is 

based on average shares outstanding in 2007.

 

 

 

(15 cents per share);  
the absence in 2009 of a Callaway nuclear plant 
refueling and maintenance outage (9 cents per share);  
the absence in 2009 of asset impairment charges 
recorded to adjust the carrying value of CILCO’s 
(through AERG) Indian Trails and Sterling Avenue 
generating facilities to their estimated fair values as of 
December 31, 2008 (6 cents per share); and  
the reduced impact in 2009 of the electric rate relief 
and customer assistance programs provided to certain 
Ameren Illinois Utilities electric customers under the 
2007 Illinois Electric Settlement Agreement (5 cents 
per share).  
The cents per share information presented above is 

based on average shares outstanding in 2008.  

Net income attributable to Ameren Corporation 

decreased $13 million and its earnings per share 
decreased 10 cents in 2008 compared with 2007. Net 
income attributable to Ameren Corporation increased in 
the Merchant Generation segment by $71 million in 2008 
compared with 2007, while net income attributable to 
Ameren Corporation in the Missouri Regulated and Illinois 
Regulated segments decreased by $47 million and 
$15 million, respectively. Other net income decreased 
$22 million in 2008 compared with 2007, primarily 
because of net unrealized MTM losses on nonqualifying 
hedges mainly related to fuel-related transactions and 
reduced interest and dividend income.  

Compared with 2007 earnings, 2008 earnings were 

negatively affected by:  
  higher fuel and related transportation prices, excluding 
net MTM losses on fuel-related transactions (27 cents 
per share);  
increased distribution system reliability expenditures 
(16 cents per share);  

 

  higher plant operations and maintenance expenses 

 

(16 cents per share);  
the impact of unfavorable milder weather conditions on 
energy demand (estimated at 16 cents per share);  
  net unrealized MTM losses on nonqualifying hedges 

(11 cents per share);  

  higher dilution and financing costs (10 cents per 

share);  

  asset impairment charges recorded to adjust the 
carrying value of CILCO’s (through AERG) Indian 

32 

  
  
Because it is a holding company, Ameren’s net income and cash flows are primarily generated by its principal 
subsidiaries: UE, CIPS, Genco, CILCO and IP. The following table presents the contribution by Ameren’s principal 
subsidiaries to Ameren’s consolidated net income for the years ended December 31, 2009, 2008 and 2007:  

Net income (loss): 

UE(a)  .......................................................................................................................................................................  
CIPS .......................................................................................................................................................................  
Genco .....................................................................................................................................................................  
CILCO .....................................................................................................................................................................  
IP   ..........................................................................................................................................................................  
Other(b)  ...................................................................................................................................................................  
Net income attributable to Ameren Corporation .............................................................................................................  

2009 

2008 

2007 

$     259  
26  
155  
134  
77  
(39 ) 
$  612  

$     245  
12  
175  
68  
3  
102  
$  605  

$     336   
14   
125   
74   
24   
45   
$  618   

(a) 
(b) 

Includes earnings from a 40% interest in EEI through February 29, 2008.  
Includes earnings from other merchant generation, including CILCORP, as well as corporate, general and administrative expenses, and intercompany 
eliminations. Includes a 40% interest in EEI through February 29, 2008, and an 80% interest in EEI since that date.  
Below is a table of income statement components by segment for the years ended December 31, 2009, 2008 and 

2007:  

$ 

Other / 
Intersegment 
Eliminations 
(22 ) 
-  
(8 ) 
       32  
(26 ) 
(2 ) 
(11 ) 
(7 ) 
24  
(20 ) 
2  
(18 ) 

$ 

$        (47)  
(5 ) 
(3 ) 
48  
(28 ) 
(1 ) 
(15 ) 
(4 ) 
40  
(15 ) 
2  
(13 ) 

$ 

$ 

$ 

(51 ) 
(8 ) 
(5 ) 
76  
(26 ) 
(1 ) 
(8 ) 
10  
20  
7  
2  
9  

Total 
$        3,859  
432  
-  
(1,738 ) 
(725 ) 
(412 ) 
48  
(508 ) 
(332 ) 
624  
(12 ) 
612  

$ 

$        3,882  
415  
-  
(1,857 ) 
(685 ) 
(393 ) 
49  
(440 ) 
(327 ) 
644  
(39 ) 
605  

$ 

$ 

$ 

3,729  
379  
-  
(1,687 ) 
(681 ) 
(381 ) 
50  
(423 ) 
(330 ) 
656  
(38 ) 
618  

2009 
Electric margins ......................................................................................  
Natural gas margins ................................................................................  
Other revenues .......................................................................................  
Other operations and maintenance .........................................................  
Depreciation and amortization .................................................................  
Taxes other than income taxes ...............................................................  
Other income and (expenses) .................................................................  
Interest charges ......................................................................................  
Income (taxes) benefit.............................................................................  
Net income (loss) ....................................................................................  
Noncontrolling interest and preferred dividends .......................................  
Net income (loss) attributable to Ameren Corporation ..............................  
2008 
Electric margins ......................................................................................  
Natural gas margins ................................................................................  
Other revenues .......................................................................................  
Other operations and maintenance .........................................................  
Depreciation and amortization .................................................................  
Taxes other than income taxes ...............................................................  
Other income and (expenses) .................................................................  
Interest charges ......................................................................................  
Income (taxes) benefit.............................................................................  
Net income (loss) ....................................................................................  
Noncontrolling interest and preferred dividends .......................................  
Net income (loss) attributable to Ameren Corporation ..............................  
2007 
Electric margins ......................................................................................  
Natural gas margins ................................................................................  
Other revenues .......................................................................................  
Other operations and maintenance .........................................................  
Depreciation and amortization .................................................................  
Taxes other than income taxes ...............................................................  
Other income and (expenses) .................................................................  
Interest charges ......................................................................................  
Income (taxes) benefit.............................................................................  
Net income .............................................................................................  
Noncontrolling interest and preferred dividends .......................................  
Net income attributable to Ameren Corporation .......................................  

Missouri 
Regulated 
$       1,983  
73  
4  
(880) 
(357) 
(257) 
56  
(229) 
(128) 
265  
(6) 
259  

$ 

$      1,924  
78  
3  
(922) 
(329) 
(240) 
53  
(193) 
(134) 
240  
(6) 
234  

$ 

$ 

$ 

1,984  
70  
2  
(900) 
(333) 
(234) 
35  
(194) 
(143) 
287  
(6) 
281  

Illinois 
Regulated 
$         886  
359  
4  
(550) 
(216) 
(125) 
2  
(153) 
(77) 
130  
(6) 
124  

$ 

$          817  
342  
-  
(627) 
(219) 
(126) 
11  
(144) 
(16) 
38  
(6) 
32  

$ 

$ 

$ 

759  
317  
3  
(550) 
(217) 
(121) 
20  
(132) 
(25) 
54  
(7) 
47  

Merchant 
Generation 
$         1,012  
-  
-  
(340) 
(126) 
(28) 
1  
(119) 
(151) 
249  
(2) 
247  

$ 

$ 

$ 

$ 

$ 

    1,188  
-  
-  
(356) 
(109) 
(26) 
-  
(99) 
(217) 
381  
(29) 
352  

1,037  
-  
-  
(313) 
(105) 
(25) 
3  
(107) 
(182) 
308  
(27) 
281  

33 

  
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Margins  

The following table presents the favorable (unfavorable) variations in the registrants’ electric and natural gas margins 

from the previous year. Electric margins are defined as electric revenues less fuel and purchased power costs. Natural 
gas margins are defined as gas revenues less gas purchased for resale. The table covers the years ended December 31, 
2009, 2008, and 2007. We consider electric and natural gas margins useful measures to analyze the change in 
profitability of our electric and natural gas operations between periods. We have included the analysis below as a 
complement to the financial information we provide in accordance with GAAP. However, these margins may not be a 
presentation defined under GAAP, and they may not be comparable to other companies’ presentations or more useful 
than the GAAP information we provide elsewhere in this report.  

2009 versus 2008 

Ameren (a) 

UE 

CIPS 

Genco 

CILCO 

IP 

Electric revenue change: 

Effect of weather (estimate) ...................................................   $ 
Regulated rates: 

Changes in base rates .....................................................  
Noranda sales .................................................................  
Illinois pass-through power supply costs ..........................  
Sales price changes, including hedge effect ..........................  
Off-system revenues .............................................................  
2007 Illinois Electric Settlement Agreement, net of 

reimbursement .................................................................  
Supply Cost Adjustment factor ...............................................  
Net unrealized MTM losses ...................................................  
Generation output, load and other .........................................  
Total electric revenue change .....................................................    $ 
Fuel and purchased power change: 

Fuel: 

(47 ) 

229  
(50 ) 
(338 ) 
115  
(89 ) 
15  
7  
(110 ) 
(190 ) 
(458 ) 

$ 

$ 

(33) 

141  
(50) 
-  
-  
(89) 
-  
-  
-  
(25) 
(56) 

Generation and other .......................................................   $        126  
Net unrealized MTM gains ...............................................  
118  
Price ................................................................................  
(83 ) 
Coal contract settlement ........................................................  
(27 ) 
Purchased power ..................................................................  
(25 ) 
Illinois pass-through power supply costs ................................  
338  
FERC-ordered MISO resettlements .......................................     
(12 ) 
Total fuel and purchased power change ......................................   $        435  
Net change in electric margins ................................................   $ 
(23 ) 
Natural gas margins change: 

$          21  
58  
-  
-  
48  
-  
(12) 
$         115  
59  
$ 

$ 

(3) 

$ 

-  

-  
-  

136  
-  
7  
-  
-  
(201) 
$         (58) 

$ 

79  
33  
(46) 
(27) 
-  
-  
-  
$          39  
(19) 
$ 

$ 

(4) 

$ 

(7 ) 

(2) 
-  
(104) 
60  
-  
4  
1  
-  
3  
$         (42) 

$ 

2  
7  
(3) 
-  
18  
104  
-  
$         128  
86  
$ 

73   
-   
(145 ) 
-   
-   
2   
4   
-   
(6 ) 
$         (79 ) 

$ 

-   
-   
-   
-   
-   
145   
-   
$        145   
66   
$ 

17  
-  
(89) 
-  
-  
2  
2  
-  
(7) 
$         (78) 

$ 

-  
-  
-  
-  
-  
89  
-  
$          89  
11  
$ 

Effect of weather (estimate) ...................................................   $ 
Changes in base rates ...........................................................  
Absence of capitalization of nonrecoverable gas costs...........  
Net unrealized 2008 MTM losses...........................................  
Other .....................................................................................  
Net change in natural gas margins ..........................................   $ 

(7 ) 
34  
(5 ) 
12  
(17 ) 
17  

$ 

$ 

(1) 
-  
-  
-  
(4) 
(5) 

$ 

$ 

(1) 
7  
(1) 
-  
(4) 
1  

$ 

$ 

-  
-  
-  
-  
-  
-  

$ 

$ 

(1) 
(6) 
-  
12  
(8) 
(3) 

$ 

$ 

(4 ) 
33   
(4 ) 
-   
(2 ) 
23   

34 

  
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2008 versus 2007 

Ameren (a) 

UE 

CIPS 

Genco 

CILCO 

IP 

Electric revenue change: 

Effect of weather (estimate) ...................................................   $ 
Regulated rates: 

Changes in base rates .....................................................  
Illinois pass-through power supply costs ..........................  
Sales price changes, including hedge effect ..........................  
Off-system revenues, excluding estimated weather impact of 

2007 Illinois Electric Settlement Agreement, net of 

$53 million .......................................................................   
reimbursement .................................................................  
FERC-ordered MISO resettlements .......................................  
Supply Cost Adjustment factor ...............................................  
Net unrealized MTM gains .....................................................  
Generation output, load and other .........................................  
Total electric revenue change .....................................................    $ 
Fuel and purchased power change: 

Fuel: 

(59) 

43  
(91) 
106  
(42) 
35  
(17) 
(2) 
81  
30  
84  

$ 

$ 

(36) 

16  
-  
-  
(47) 
-  
-  
-  
8  
29  
(30) 

$ 

$ 

(6) 

5  
(58) 
-  
-  
6  
-  
(2) 
-  
3  
(52) 

$ 

-  

$ 

-  
-  
45  
-  
13  
(12) 
-  
-  
(14) 
$          32   

$ 

(4) 

-  
15  
18  
-  
9  
(4) 
5  
-  
51  
90  

$ 

$ 

(13 ) 

22  
(48 ) 
-  
-  
7  
-  
(5 ) 
-  
4  
(33 ) 

Generation and other .......................................................   $ 
33  
Net unrealized MTM losses ..............................................  
(75) 
Price ................................................................................  
(93) 
Coal contract settlement for 2009 ..........................................  
27  
Purchased power ..................................................................  
39  
Illinois pass-through power supply costs ................................  
91  
FERC-ordered MISO resettlements .......................................   
47  
Total fuel and purchased power change ......................................   $ 
69  
Net change in electric margins ................................................   $        153  
Natural gas margins change: 

$          31   
(39) 
(56) 
-  
9  
-  
23  
(32) 
(62) 

$ 
$ 

$ 

-  
-  
-  
-  
-  
58  
8  
$          66   
14  
$ 

Effect of weather (estimate) ...................................................   $ 
Changes in base rates ...........................................................  
Capitalization of nonrecoverable gas costs ............................  
Net unrealized MTM losses ...................................................  
Other .....................................................................................  
Net change in natural gas margins ..........................................   $ 

2  
1  
2  
-  
2  
7  
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

12  
7  
9  
(6) 
14  
36  

2  
3  
-  
-  
3  
8  

(a) 

$ 

$ 

$ 

$ 

$ 

$ 
$ 

$ 

$ 

31  
(18) 
(13) 
27  
23  
-  
-  
50  
82  

-  
-  
-  
-  
-  
-  

$ 

(32) 
(3) 
(15) 
-  
-  
(15) 
4  
(61) 
$ 
$          29  

$ 

-  
-  
-  
-  
-  
48  
12  
60  
$ 
$           27  

$ 

$ 

2  
(5) 
-  
(6) 
8  
(1) 

$ 

$ 

6  
8  
7  
-  
(3 ) 
18  

2009 versus 2008  

Ameren  

Ameren’s electric margins decreased by $23 million, 
or 1%, in 2009 compared with 2008. The following items 
had an unfavorable impact on Ameren’s electric margins:  
  Higher net fuel expense at UE of $20 million resulting 
from lower off-system revenues ($89 million), offset, in 
part, by lower fuel-generation and other ($21 million) 
and purchased power ($48 million).  

  Net unrealized MTM activity in the Merchant 

Generation segment of $110 million (Marketing 
Company net loss of $112 million and EEI net gain of 
$2 million) on energy transactions, primarily related to 
nonqualifying hedges of changes in market prices for 
electricity.  

  Higher fuel expense at Genco as a result of its June 

2008 settlement agreement with a coal mine owner to 
receive a lump-sum payment of $60 million for the 
early termination of a coal supply contract. This 
payment compensated Genco, in total, for higher fuel 
costs it incurred throughout 2008 ($33 million) and 
2009 ($27 million). Because the entire settlement was 
recorded in earnings in 2008, Ameren’s earnings in 

2009 were comparatively lower than they otherwise 
would have been.  

  Excluding the impact of the June 2008 settlement 
agreement, 5% higher fuel prices in the Merchant 
Generation segment.  

  Reduced sales by UE to Noranda, due to an extended 
severe storm-related outage, which lowered electric 
revenues by $50 million in 2009. See Outlook for 
additional information on the Noranda plant outage.  
  Unfavorable weather conditions, as evidenced by a 

7% reduction in cooling degree-days, which decreased 
margins by $43 million.  

  Excluding the impact of UE’s reduced sales to 

Noranda, lower weather-normalized end-use retail 
sales volume of 4% in Ameren’s rate-regulated utilities, 
largely a result of the economic slowdown, which 
decreased margins by $23 million.  

  Decreased power plant utilization in the Merchant 
Generation segment, primarily because of lower 
market prices, which resulted in fewer opportunities for 
economic sales, and transmission congestion, which 
limited the period when power could be sold. Merchant 
Generation’s baseload, coal-fired generating plants’ 
equivalent availability factors were 81% in 2009,  

35 

  
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
compared with 85% in 2008, and the average capacity 
factor was 66% in 2009, compared with 76% in 2008.  

The following items had a favorable impact on Ameren’s 

electric margins for 2009 compared with 2008:  

  Higher electric rates at UE, effective March 1, 2009, 
which increased margins by $141 million, and at the 
Ameren Illinois Utilities, effective October 1, 2008, which 
increased margins by $88 million.  

  Net unrealized MTM activity at UE of $58 million on 

energy and fuel-related transactions. During 2009 UE 
reversed and deferred as regulatory assets previously 
recorded net MTM losses of $42 million on energy and 
fuel-related transactions in the first quarter of 2009, when 
these costs became probable of recovery because of the 
FAC. See Note 7 – Derivative Financial Instruments 
under Part II, Item 8, of this report, for additional 
information.  

  Net unrealized MTM activity at the Merchant Generation 

segment of $55 million (Genco – $33 million, CILCO – 
$7 million, EEI – $15 million) on fuel-related transactions. 
These were primarily associated with financial 
instruments that were acquired to mitigate the risk of 
rising diesel fuel price adjustments embedded in coal 
transportation contracts.  

  The repricing of wholesale and retail electric power 

supply agreements and financial swaps that settled at 
higher margins at Merchant Generation.  

  Higher wholesale sales margins at UE of $32 million 

because of additional customers and higher-priced 
wholesale sales contracts. Power was available for sale 
to wholesale customers as a result of reduced native 
load demand.  

  The recovery of power supply costs incurred by the 
Ameren Illinois Utilities of $7 million, including an 
increase in Supply Cost Adjustment (SCA) factors as 
approved in the 2008 ICC electric rate order.  

  A $15 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

  Higher Callaway nuclear plant availability due to the 

absence of a 30-day planned maintenance outage, which 
occurred in the fourth quarter of 2008.  

Ameren’s natural gas margins increased by $17 million, 
or 4%, in 2009 compared with 2008. The following items had 
a favorable impact on Ameren’s natural gas margins:  

  The Ameren Illinois Utilities’ net gas delivery service rate 
increase, effective October 1, 2008, which increased 
margins by $34 million.  

  The absence of net unrealized MTM losses at CILCO of 

$12 million in 2009 on natural gas swaps.  

The following items had an unfavorable impact on 
Ameren’s natural gas margins in 2009 compared with 2008:  

  Unfavorable weather conditions, as evidenced by an 8% 
reduction in heating degree-days, which decreased 
margins by $7 million.  
7% lower weather-normalized sales volumes, largely a 
result of the economic slowdown, which decreased 
margins by $9 million.  

 

  The absence of the capitalization of nonrecoverable 

purchased gas costs in accordance with the September 
2008 ICC gas rate order, which resulted in a one-time 
increase in margins of $5 million in 2008.  

Missouri Regulated (UE)  

UE’s electric margins increased $59 million, or 3%, in 

2009 compared with 2008. The following items had a 
favorable impact on UE’s electric margins:  

  Higher electric rates, effective March 1, 2009, which 

increased margins by $141 million.  

  Net unrealized MTM activity of $58 million on energy and 

fuel-related transactions. During 2009 UE reversed and 
deferred as regulatory assets previously recorded net 
MTM losses of $42 million on energy and fuel-related 
transactions in the first quarter of 2009, when these costs 
became probable of recovery because of the FAC. See 
Note 7 – Derivative Financial Instruments under Part II, 
Item 8, of this report, for additional information.  
  Higher wholesale sales margins of $32 million due to 

additional customers and higher-priced wholesale sales 
contracts. Power was available for sale to wholesale 
customers as a result of reduced native load demand.  

  Higher Callaway nuclear plant availability due to the 

absence of a 30-day planned maintenance outage, which 
occurred in the fourth quarter of 2008.  

The following items had an unfavorable impact on UE’s 

electric margins in 2009 compared with 2008:  

  Higher net fuel expense of $20 million resulting from 

lower off-system revenues ($89 million), offset, in part, by 
lower fuel-generation and other ($21 million) and 
purchased power ($48 million).  

  Reduced sales to Noranda, due to an extended severe 

storm-related outage, which lowered electric revenues by 
$50 million. See Outlook for additional information on the 
Noranda plant outage.  

  Unfavorable weather conditions, as indicated by a 13% 

reduction in cooling degree-days during the third quarter, 
which is UE’s peak cooling period, and a mild winter, 
which decreased margins by $29 million.  

  Excluding the impact of reduced sales to Noranda, 2% 

lower weather-normalized end-use retail sales volumes, 
largely a result of the economic slowdown, which 
decreased margins by $18 million.  

  The absence in 2009 of the benefits from a MoPSC order 
that directed the recording of a regulatory asset related 
to previously incurred costs for a 2007 FERC order, 
which decreased margins by $12 million.  

UE’s natural gas margins decreased by $5 million, or 
6%, in 2009 compared with 2008, primarily because of an 8% 
decrease in weather-normalized sales volumes in 2009.  

Illinois Regulated  

Illinois Regulated’s electric margins increased by 

$69 million, or 8%, in 2009 compared with 2008. Illinois 
Regulated’s natural gas margins increased by $17 million, or 
5%, in 2009 compared with 2008. The Ameren Illinois

36 

  
  
Utilities have a cost recovery mechanism for power 
purchased on behalf of their customers. These pass-through 
power costs do not affect margins; however, the electric 
revenues and offsetting purchased power costs fluctuate 
primarily because of customer switching and usage. See 
below for explanations of electric and natural gas margin 
variances for the Illinois Regulated segment.  

CIPS  

CIPS’ electric margins increased by $11 million, or 4%, in 

2009 compared with 2008. The following items had a 
favorable impact on electric margins:  

  Higher electric delivery service rates, effective October 1, 
2008, which increased margins by $17 million in 2009.  

  The recovery of power supply costs incurred of 

$2 million, including an increase in the SCA factors, as 
approved in the 2008 ICC electric rate order.  

  A $2 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

The following items had an unfavorable impact on CIPS’ 

electric margins in 2009 compared with 2008:  

  Net transmission margins that were $4 million lower, 

primarily because of reduced transmission service rates 
that were based on lower transmission costs in the prior 
year.  

  Unfavorable weather conditions, as evidenced by a 7% 
reduction in cooling degree-days, which decreased 
margins by $3 million.  

CIPS’ natural gas margins increased by $1 million, or 

1%, in 2009 compared with 2008. This was primarily due to 
higher gas delivery service rates, effective October 1, 2008, 
which increased margins by $7 million.  

The following items had an unfavorable impact on CIPS’ 

natural gas margins in 2009 compared with 2008:  

  Unfavorable weather conditions, as evidenced by an 8% 
reduction in heating degree-days, which decreased 
margins by $1 million.  
3% lower weather-normalized sales volumes for 2009, 
largely a result of the economic slowdown, which 
decreased margins by $2 million.  

 

  The absence of the capitalization of nonrecoverable 

purchased gas costs in accordance with the September 
2008 ICC gas rate order, which resulted in a one-time 
increase in margins of $1 million in 2008.  

CILCO (Illinois Regulated)  

The following table provides a reconciliation of CILCO’s 

change in electric margins by segment to CILCO’s total 
change in electric margins for 2009 compared with 2008:  

CILCO (Illinois Regulated)....................................  
CILCO (AERG) ....................................................  
Total change in electric margins ...........................   

2009 versus 2008 
$  (8 ) 
  94  
$   86  

CILCO’s (Illinois Regulated) electric margins decreased 

by $8 million, or 5%, in 2009 compared with 2008. The 

following items had an unfavorable impact on electric 
margins:  

 

Lower electric delivery service rates, effective October 1, 
2008, which decreased margins by $2 million.  

 

  Unfavorable weather conditions, as evidenced by a 25% 
reduction in cooling degree-days, which decreased 
margins by $4 million.  
10% lower weather-normalized sales volumes, primarily 
in the lower-margin industrial customer sector, largely a 
result of the economic slowdown, which decreased 
margins by $1 million.  

CILCO’s (Illinois Regulated) electric margins were 

favorably affected in 2009 compared with 2008 by:  

  The recovery of power supply costs incurred of 

$1 million, including an increase in the SCA factors, as 
approved in the 2008 ICC electric rate order.  

  A $1 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

See Merchant Generation below for an explanation of 
CILCO’s (AERG) electric margins in 2009 compared with 
2008.  

CILCO’s (Illinois Regulated) natural gas margins 

decreased by $3 million, or 3%, in 2009 compared with 2008. 
CILCO’s natural gas margins were unfavorably affected by:  

 

 

12% lower weather-normalized sales volumes and lower 
realized prices related to a contract with a large industrial 
customer for 2009, largely a result of the economic 
slowdown, which decreased margins by $8 million.  
Lower gas delivery service rates, effective October 1, 
2008, which decreased margins by $6 million.  

  Unfavorable weather conditions, as evidenced by a 5% 
reduction in heating degree-days, which decreased 
margins by $1 million.  

CILCO’s natural gas margins were favorably affected in 
2009 compared with 2008 by the absence of net unrealized 
MTM losses of $12 million in 2009 on natural gas swaps.  

IP  

IP’s electric margins increased by $66 million, or 16%, in 

2009 compared with 2008. The following items had a 
favorable impact on electric margins:  

  Higher electric delivery service rates, effective October 1, 

2008, which increased margins by $73 million.  
  The recovery of power supply costs incurred of 

$4 million, including an increase in the SCA factors, as 
approved in the 2008 ICC electric rate order.  

  A $2 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

IP’s electric margins were unfavorably affected in 2009 

compared to 2008 by:  

  Unfavorable weather conditions, as evidenced by a 12% 
reduction in cooling degree-days, which decreased 
margins by $7 million. 

37 

  
 
 
 
  
 
  
  Excluding the impact of the June 2008 settlement 

agreement, 3% higher fuel prices.  

Genco’s electric margins were favorably affected in 2009 

compared with 2008 by:  

  Net unrealized MTM activity of $33 million on fuel-related 
transactions. These were primarily associated with 
financial instruments that were acquired to mitigate the 
risk of rising diesel fuel price adjustments embedded in 
coal transportation contracts.  
Lower emission allowance costs because of lower prices 
and reduced generation increased margins by 
$11 million.  

 

  A $7 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

CILCO (AERG)  

AERG’s electric margins increased by $94 million, or 
43%, in 2009 compared with 2008. The following items had a 
favorable impact on electric margins:  

  Higher revenues allocated to AERG under its power 
supply agreement (AERG PSA) with Marketing 
Company, which were because of higher reimbursable 
expenses and higher generation relative to Genco in 
accordance with the AERG PSA. AERG’s baseload coal-
fired generating plants’ equivalent availability and 
average capacity factors were comparable to 2008. 
Financial swaps also settled at higher margins, and new 
higher-priced wholesale and retail electric power supply 
agreements increased revenues.  

  Net unrealized MTM activity of $7 million on fuel-related 
transactions. These were primarily associated with 
financial instruments that were acquired to mitigate the 
risk of rising diesel fuel price adjustments embedded in 
coal transportation contracts.  

  Oil consumption was lower because of fewer plant 

startups and lower oil prices in 2009, reducing costs by 
$6 million.  

  A $3 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

Other Merchant Generation  

Electric margins from Ameren’s other Merchant 
Generation operations, primarily EEI and Marketing 
Company, decreased by $251 million, or 66%, in 2009. Other 
Merchant Generation electric margins were unfavorably 
affected, compared with 2008, by:  

  Decreased power plant utilization, primarily because of 

lower market prices, which resulted in fewer 
opportunities for economic sales, and plant outages. The 
average realized sales price for power including hedging 
decreased by 27%. EEI’s baseload coal-fired generating 
plant’s equivalent availability and average capacity 
factors were 88% and 81%, respectively, in 2009, 
compared with 92% and 91%, respectively, in 2008. 

  4% lower weather-normalized sales volumes, primarily in 
the lower-margin industrial customer sector, largely as a 
result of the economic slowdown, which decreased 
margins by $6 million.  

IP’s natural gas margins increased by $23 million, or 
14%, in 2009 compared with 2008. This was primarily due to 
higher gas delivery service rates, effective October 1, 2008, 
which increased margins by $33 million.  

The following items had an unfavorable impact on IP’s 

natural gas margins in 2009 compared with 2008:  

  Unfavorable weather conditions, as evidenced by an 8% 
reduction in heating degree-days, which decreased 
margins by $4 million.  

  The absence of the capitalization of nonrecoverable 

purchased gas costs in accordance with the September 
2008 ICC gas rate order, which resulted in a one-time 
increase in margins of $4 million in 2008.  
4% lower weather-normalized sales volumes, largely a 
result of the economic slowdown, which decreased 
margins by $3 million.  

 

Merchant Generation  

Merchant Generation’s electric margins decreased by 

$176 million, or 15%, in 2009 compared with 2008.  

Genco  

Genco’s electric margins decreased by $19 million, or 
3%, in 2009 compared with 2008. The following items had an 
unfavorable impact on electric margins:  

  Decreased power plant utilization, primarily due to lower 

market prices, which resulted in fewer opportunities for 
economic sales, and transmission congestion, which 
limited the period when power could be sold. In addition, 
one of Genco’s coal-fired power plants experienced a 
transformer fire in September 2009, which put two units 
out of service for a period of time. This contributed to a 
reduction in Genco’s baseload coal-fired generating 
plants’ equivalent availability factor to 81% in 2009, 
compared with 86% in 2008. Genco’s average capacity 
factor also decreased to 60% in 2009, compared with 
73% in 2008.  
Lower revenues allocated to Genco under its power 
supply agreement (Genco PSA) with Marketing 
Company, which were because of lower reimbursable 
expenses and lower generation relative to AERG in 
accordance with the Genco PSA, partially offset by 
financial swaps settling at higher margins and new 
higher-priced wholesale and retail electric power supply 
agreements.  

 

  Higher fuel expense as a result of Genco’s June 2008 

settlement agreement with a coal mine owner to receive 
a lump-sum payment of $60 million for the early 
termination of a coal supply contract. This payment 
compensated Genco, in total, for higher fuel costs it 
incurred throughout 2008 ($33 million) and 2009 
($27 million). Because the entire settlement was 
recorded in earnings in the second quarter of 2008,  
Genco’s earnings in 2009 were comparatively lower than 
they otherwise would have been.  

38 

  27% higher fuel prices at EEI because of an increase in 

transportation costs.  

  Net unrealized MTM activity (mostly at Marketing 

Company) of $95 million on energy and fuel-related 
transactions. These were primarily associated with 
financial instruments that related to nonqualifying hedges 
of changes in market prices for electricity.  

 
 

2008 versus 2007  

Ameren  

Ameren’s electric margins increased by $153 million, or 
4%, in 2008 compared with 2007. The following items had a 
favorable impact on Ameren’s electric margins:  

  Net unrealized MTM gains of $81 million on energy 

 

transactions, primarily related to nonqualifying hedges of 
changes in market prices for electricity.  
Increased Merchant Generation plant availability due to 
the lack of an extended plant outage in 2008. Merchant 
Generation’s baseload coal-fired generating plants’ 
average capacity and equivalent availability factors were 
approximately 76% and 85%, respectively, in 2008 
compared with 74% and 81%, respectively, in 2007.  

  Higher electric rates at the Ameren Illinois Utilities, 

effective October 1, 2008, which increased margins by 
$27 million and higher electric rates at UE, effective 
June 4, 2007, increased margins by $16 million.  

  A $35 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

  The absence in 2008 of a March 2007 FERC order that 
resettled costs among MISO participants retroactive to 
2005 that was recorded in 2007, and the subsequent 
recovery of a portion of these costs in 2008 through a 
MoPSC order. The net benefit to electric margins in 2008 
of these items was $30 million.  
Lower fuel expense at Genco as a result of a settlement 
agreement with a coal mine owner reached in June 
2008, which increased margins by $27 million. Genco 
received a lump-sum payment for increased costs for 
coal and transportation that it expected to incur in 2009 
because of the premature closure of an Illinois mine and 
contract termination.  

 

  Other MISO net purchased power costs, which 

decreased by $23 million.  

  Merchant Generation emission allowance costs were 

reduced by $8 million.  

  Merchant Generation capacity sales increased by 

$6 million.  

The following items had an unfavorable impact on 
Ameren’s electric margins in 2008 compared with 2007:  

  Net unrealized MTM losses of $75 million on fuel-related 
transactions. These were primarily associated with 
financial instruments that were acquired to mitigate the 
risk of rising diesel fuel price adjustments embedded in 
coal transportation contracts for the period 2008 through 
2012.  

  Unfavorable weather conditions, as evidenced by a 30% 
reduction in cooling degree-days, which decreased 
margins by $65 million. Compared with normal weather, 
cooling degree-days in 2008 were 5% lower.  

39 

6% higher fuel prices.  
Lower off-system margins due to reduced UE plant 
availability, partially offset by an 8% increase in realized 
prices and a 10% increase in hydroelectric generation. 
Reduced Callaway nuclear plant availability was due to 
unplanned plant outages, which offset the shorter 
planned refueling and maintenance outage. UE’s coal-
fired generating plants’ average capacity and equivalent 
availability factors were approximately 78% and 88%, 
respectively, in 2008 compared with 80% and 89%, 
respectively, in 2007.  

Ameren’s natural gas margins increased by $36 million, 
or 9%, in 2008 compared with 2007. The following items had 
a favorable impact on Ameren’s natural gas margins:  

  Favorable weather conditions, as evidenced by a 13% 
increase in heating degree-days, which increased 
margins by $12 million. Compared with normal weather, 
heating degree-days in 2008 were 7% higher.  
  Higher net gas rates at the Ameren Illinois Utilities, 

effective October 1, 2008, which increased margins by 
$4 million, and higher net gas rates at UE, effective April 
2007, which increased margins by $3 million.  

  A September 2008 ICC rate order that concluded that a 

portion of previously expensed nonrecoverable 
purchased gas costs should be capitalized, which 
increased margins by $9 million.  
Increased weather-normalized sales volumes of 2% and 
favorable customer sales mix, which increased margins 
by $5 million.  

 

  Transportation revenues increased by $4 million.  

Missouri Regulated (UE)  

UE’s electric margins decreased $62 million, or 3%, in 

2008 compared with 2007. The following items had an 
unfavorable impact on UE’s electric margins:  

  Unfavorable weather conditions, as evidenced by a 29% 
reduction in cooling degree-days, which decreased 
margins by $42 million.  

  Net unrealized MTM losses of $39 million on fuel-related 
transactions. These were primarily associated with 
financial instruments that were acquired to mitigate the 
risk of rising diesel fuel price adjustments embedded in 
coal transportation contracts for the period 2008 through 
2012.  
5% higher fuel prices.  

 
  Replacement power insurance recoveries were 

 

$12 million lower due to the lack of an extended plant 
outage and an increase in insurance recovery deductible 
limits.  
Lower off-system margins because of reduced plant 
availability, partially offset by an 8% increase in realized 
prices and a 10% increase in hydroelectric generation. 
Callaway nuclear plant availability was reduced because 
of unplanned plant outages, which offset the shorter 
planned refueling and maintenance outage. UE’s coal-
fired generating plants’ average capacity and equivalent 
availability factors were approximately 78% and 88%, 

 
  
respectively, in 2008, compared with 80% and 89%, 
respectively in 2007.  

The following items had a favorable impact on electric 

CIPS’ natural gas margins increased by $7 million, or 
10%, in 2008 compared with 2007. The following items had a 
favorable impact on natural gas margins:  

margins in 2008 compared with 2007:  

  Favorable customer sales mix, which increased margins 

  The absence in 2008 of a March 2007 FERC order that 
resettled costs among MISO participants retroactive to 
2005 that was recorded in 2007, and the subsequent 
recovery of a portion of these costs in 2008 through a 
MoPSC order. The net benefit to UE’s margins in 2008 of 
these items was $23 million.  

  Other MISO net purchased power costs, which 

decreased by $15 million.  

  Higher electric rates, effective June 4, 2007, which 

increased margins by $16 million.  

  Net unrealized MTM gains of $8 million, primarily related 
to nonqualifying hedges of changes in market prices for 
electricity.  

UE’s natural gas margins increased by $8 million, or 
11%, in 2008 compared with 2007. The following items had a 
favorable impact on natural gas margins:  

  Higher gas rates, effective April 2007, which increased 

margins by $3 million.  

  Favorable customer sales mix, which increased margins 

by $3 million.  

  Favorable weather conditions, as evidenced by a 12% 
increase in heating degree-days, which increased 
margins by $2 million.  

Illinois Regulated  

Illinois Regulated’s electric margins increased by 
$58 million, or 8%, and natural gas margins increased by 
$25 million, or 8%, in 2008 compared with 2007. The Ameren 
Illinois Utilities have a cost recovery mechanism for power 
purchased on behalf of their customers. These pass-through 
power costs do not affect margins; however, the electric 
revenues and offsetting purchased power costs fluctuate 
primarily because of customer switching and usage. See 
below for explanations of electric and natural gas margins 
variances for the Illinois Regulated segment.  

CIPS  

CIPS’ electric margins increased by $14 million, or 6%, in 

2008 compared with 2007. The following items had a 
favorable impact on electric margins:  

  MISO purchased power costs were $8 million lower due 

to the absence of the March 2007 FERC order.  
  Other MISO net purchased power costs, which 

decreased by $5 million.  

  A $6 million reduced impact of the 2007 Illinois Electric 

Settlement Agreement.  

  Higher electric delivery service rates, effective October 1, 

2008, which increased margins by $5 million.  

These favorable variances were partially offset by 

unfavorable weather conditions, as evidenced by a 30% 
reduction in cooling degree-days, which decreased electric 
margins by $6 million.  

by $2 million.  

  Favorable weather conditions, as evidenced by a 12% 
increase in heating degree-days, which increased 
margins by $2 million.  

  A September 2008 ICC rate order, that concluded that a 

portion of previously expensed nonrecoverable 
purchased gas costs should be capitalized, which 
increased margins by $2 million.  

  Higher gas delivery service rates, effective in October 

2008, which increased margins by $1 million.  

CILCO (Illinois Regulated)  

The following table provides a reconciliation of CILCO’s 

change in electric margins by segment to CILCO’s total 
change in electric margins for 2008 compared with 2007:  

CILCO (Illinois Regulated)....................................  
CILCO (AERG) ....................................................  
Total change in electric margins ...........................   

2008 versus 2007 
$   17 
12 
$  29 

CILCO’s (Illinois Regulated) electric margins increased 

by $17 million, or 14%, in 2008 compared with 2007. The 
following items had a favorable impact on electric margins:  

 

Increased delivery and generation service margins of 
$14 million due to increased sales volume and favorable 
customer sales mix, and the reduced impact of monthly 
MISO settlements that occurred in the prior year.  
  MISO purchased power costs were $4 million lower due 

to the absence of the March 2007 FERC order.  
  A $3 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

These favorable variances were partially offset by 

unfavorable weather conditions, as evidenced by a 28% 
reduction in cooling degree-days, which decreased margins 
by $4 million.  

See Merchant Generation below for an explanation of 
CILCO’s (AERG) electric margins in 2008 compared with 
2007.  

CILCO’s (Illinois Regulated) natural gas margins 
decreased $1 million, or 1%, in 2008 compared with 2007. 
The following items had an unfavorable impact on gas 
margins:  

  Net unrealized MTM losses on natural gas swaps of 

 

$6 million in 2008.  
Lower gas delivery service rates, effective in October 
2008, which decreased margins by $5 million.  

The following items had a favorable impact on gas 

margins in 2008 compared with 2007:  

 

5% higher weather-normalized sales volumes and 
favorable customer mix, which increased margins by 
$8 million.

40 

  
 
 
 
 
 
 
 
  
  
  Favorable weather conditions, as evidenced by an 
11% increase in heating degree-days, which 
increased margins by $2 million.  

IP  
IP’s electric margins increased by $27 million, or 7%, 

in 2008 compared with 2007. The following items had a 
favorable impact on electric margins:  
  Higher electric delivery service rates, effective 

October 1, 2008, which increased margins by $22 
million.  

  MISO purchased power costs were $12 million lower 
due to the absence of the March 2007 FERC order.  
  A $7 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  
These favorable variances were partially offset by 
unfavorable weather conditions, as evidenced by a 34% 
reduction in cooling degree-days, which decreased 
margins by $13 million.  

IP’s natural gas margins increased by $18 million, or 

12%, in 2008 compared with 2007. The following items 
had a favorable impact on natural gas margins:  
  Higher gas delivery service rates, effective in October 

2008, which increased margins by $8 million.  
  A September 2008 ICC rate order concluded that a 
portion of previously expensed nonrecoverable 
purchased gas costs should be capitalized, which 
increased margins by $7 million.  

  Favorable weather conditions, as evidenced by a 15% 
increase in heating degree-days, which increased 
margins by $6 million.  
These favorable variances were partially offset by a 
4% decrease in weather-normalized sales volumes, which 
decreased margins by $3 million.  

Merchant Generation  

Merchant Generation’s electric margins increased by 

$151 million, or 15%, in 2008 compared with 2007. 
Merchant Generation’s baseload coal-fired generating 
plants’ average capacity and equivalent availability factors 
were approximately 76% and 85%, respectively, in 2008 
compared with 74% and 81%, respectively, in 2007. See 
below for explanations of electric margins variances for 
the Merchant Generation segment.  

Genco  
Genco’s electric margins increased by $82 million, or 

16%, in 2008 compared with 2007. The following items 
had a favorable impact on electric margins:  
  Lower fuel expense at Genco as a result of a 

settlement agreement with a coal mine owner reached 
in June 2008, which increased margin by $27 million. 
Genco received a lump-sum payment for increased 
costs for coal and transportation that it expected to 
incur in 2009 because of the premature closure of an 
Illinois mine and contract termination.  

 

Increased revenues allocated to Genco under its 
power supply agreement (Genco PSA) with Marketing 
Company. Revenues from the Genco PSA increased 
by 7% primarily because of the repricing of wholesale 
and retail electric power supply agreements, and an 
increase in reimbursable expenses in accordance with 
the Genco PSA.  

  Purchased power costs were reduced by $17 million 
due to the absence of MISO resettlement costs 
experienced in early 2007.  

  A $13 million reduction in the 2007 Illinois Electric 

Settlement Agreement.  

  Gains on the sales of excess oil and off-system 
natural gas increased margins by $12 million.  
  Replacement power insurance recoveries were $9 

million higher due to extended plant outages in 2008.  

  Lower emission allowance costs of $5 million due 

primarily to an increase in low-sulfur coal consumption 
in 2008.  
The following items had an unfavorable impact on 

electric margins in 2008 compared with 2007:  
  Excluding the impact of the June 2008 settlement 

agreement, 2% higher fuel prices.  

  Net unrealized MTM losses of $18 million on fuel-

related transactions. These were primarily associated 
with financial instruments that were acquired to 
mitigate the risk of rising diesel fuel price adjustments 
embedded in coal transportation contracts for the 
period 2008 through 2012.  

  MISO-related revenues were $12 million lower due to 

the absence of the March 2007 FERC order.  
  Decreased power plant utilization due to system 

congestion. Genco’s baseload coal-fired generating 
plants’ equivalent availability factors were comparable 
year over year. However, the average capacity factor 
was approximately 73% in 2008, compared with 75% 
in 2007.  

  A $9 million decrease in revenues because of the 

termination of an operating lease in February 2008 
under which Genco leased certain CTs at a Joppa, 
Illinois, site to its former parent, Development 
Company. See Note 14 – Related Party Transactions 
to our financial statements under Part II, Item 8, of this 
report, for additional information.  

CILCO (AERG)  
AERG’s electric margins increased by $12 million, or 

7%, in 2008 compared with 2007. The following items had 
a favorable impact on electric margins:  
 

Increased revenue allocated to AERG under its power 
supply agreement (AERG PSA) with Marketing 
Company. Revenues from the AERG PSA increased 
24% primarily because of stronger generation 
performance as a result of the lack of an extended 
plant outage in 2008, the repricing of wholesale and 
retail electric power supply agreements, and an 
increase in reimbursable expenses in accordance with 
the AERG PSA. AERG’s baseload coal-fired 
generating plants’ average capacity and equivalent 

41 

availability factors were approximately 70% and 77%, 
respectively, in 2008 compared with 55% and 61%, 
respectively, in 2007.  

  A $6 million reduction in the impact of the 2007 Illinois 

Electric Settlement Agreement.  

The following items had an unfavorable impact on 

electric margins in 2008 compared with 2007:  

 

30% higher fuel prices, primarily due to a greater 
percentage of higher-cost Illinois coal burned in 2008 
and an increased amount of oil consumed during plant 
start-ups.  

nuclear plant refueling and maintenance outage in 2009, as 
compared with costs of $30 million in 2008, also reduced 
operations and maintenance expenses. Additionally, asset 
impairment charges were lower by $7 million between years.  

Reducing the benefit of these items was an increase of 
$24 million in labor costs and the recognition of $17 million 
for employee severance costs in 2009. In 2008, other 
operations and maintenance expenses were reduced by a 
MoPSC accounting order related to storm costs incurred in 
2007, which resulted in UE recording a regulatory asset of 
$25 million; no similar item occurred in 2009.  

  MISO-related revenues were $4 million lower due to the 

Variations in other operations and maintenance 

absence of the March 2007 FERC order.  

  Net unrealized MTM losses of $3 million on fuel-related 
transactions. These were primarily associated with 
financial instruments that were acquired to mitigate the 
risk of rising diesel fuel price adjustments embedded in 
coal transportation contracts for the period 2008 through 
2012.  

Other Merchant Generation  

Electric margins from Ameren’s other Merchant 
Generation operations, primarily from EEI and Marketing 
Company, increased by $57 million, or 18%, in 2008. Other 
Merchant Generation electric margins were unfavorably 
affected compared with 2007 by:  

9% higher fuel prices.  

 
  Net unrealized MTM losses of $8 million on fuel-related 
transactions. These were primarily associated with 
financial instruments that were acquired to mitigate the 
risk of rising diesel fuel price adjustments embedded in 
coal transportation contracts for the period 2008 through 
2012.  

Other Merchant Generation electric margins were 
favorably affected by market price fluctuations during 2008, 
which resulted in nonaffiliated MTM gains on energy 
transactions of $73 million, primarily related to nonqualifying 
hedges of changes in market prices for electricity.  

Other Operations and Maintenance Expenses  

2009 versus 2008  

Ameren  

Other operations and maintenance expenses decreased 
$119 million in 2009 compared with 2008 because of several 
factors. Coal-fired plant maintenance costs were reduced by 
$48 million and bad debt expenses were lower by $44 million, 
because of elevated levels of bad debt expense in 2008 as a 
result of the transition to higher market-based rates at the 
Ameren Illinois Utilities and the impact of the Illinois bad debt 
rate adjustment mechanism (net of a related donation for 
customer assistance programs) discussed in Note 2 – Rate 
and Regulatory Matters under Part II, Item 8 of this report. A 
favorable change of $37 million in unrealized net MTM 
adjustments between periods resulting from changes in the 
market value of investments used to support Ameren’s 
deferred compensation plans and the absence of a Callaway  

expenses in Ameren’s and CILCO’s business segments and 
for the Ameren Companies between 2009 and 2008 were as 
follows.  

Missouri Regulated (UE)  

Other operations and maintenance expenses decreased 

$42 million. This was primarily because of a $32 million 
reduction in coal-fired plant maintenance costs and the 
absence of a Callaway nuclear plant refueling and 
maintenance outage in 2009, as compared with costs of 
$30 million in 2008. A favorable change of $19 million in 
unrealized net MTM adjustments between periods, which 
resulted from changes in the market value of investments 
used to support Ameren’s deferred compensation plans, and 
a $14 million decline in employee benefit costs also resulted 
in decreased expenses between years.  

Reducing the benefit of these items was a $21 million 

increase in labor costs, the recognition of $8 million in 
employee severance costs in 2009, and the absence of the 
MoPSC storm cost accounting order of $25 million that 
occurred in 2008, as described above. In addition to these 
items, storm repair expenditures were higher in 2009 as a 
result of a severe ice storm at the beginning of the year.  

Illinois Regulated  

Other operations and maintenance expenses decreased 

$77 million in the Illinois Regulated segment, as discussed 
below.  

CIPS  

Other operations and maintenance expenses decreased 

$15 million, primarily because of a $10 million reduction in 
bad debt expense, because of elevated levels of bad debt 
expense in 2008 and the impact of the Illinois bad debt rate 
adjustment mechanism (net of a related donation for 
customer assistance programs), and a favorable change in 
unrealized net MTM adjustments between periods resulting 
from changes in the market value of investments used to 
support Ameren’s deferred compensation plans.  

CILCO (Illinois Regulated)  

Other operations and maintenance expenses increased 
$63 million, primarily because of higher labor and employee 
benefit costs. These increases were primarily a result of work 
performed on behalf of CIPS and IP as discussed below.  

42 

  
At the beginning of 2009, approximately 570 
employees were transferred from Ameren Services to 
CILCO (Illinois Regulated), which resulted in an increase 
in other operations and maintenance expenses at CILCO 
(Illinois Regulated) in 2009. These CILCO (Illinois 
Regulated) employees also provide support services to 
CIPS and IP. CILCO (Illinois Regulated) records 
reimbursements from CIPS and IP for work performed by 
its employees on their behalf as Operating Revenues – 
Support Services – Affiliates on its statement of income, 
which increased $70 million in 2009 compared with 2008. 
Intercompany revenue and expenses associated with 
these transactions are eliminated in consolidation within 
the Illinois Regulated segment. See Note 14 – Related 
Party Transactions to our financial statements under Part 
II, Item 8, of this report for additional information on 
CILCO (Illinois Regulated) support services.  

Reducing the unfavorable effect of the above items 
was a reduction in bad debt expense, because of elevated 
levels of bad debt expense in 2008 and the impact of the 
Illinois bad debt rate adjustment mechanism (net of a 
related donation for customer assistance programs).  

IP  
IP’s other operations and maintenance expenses 
decreased $43 million, primarily because of a $25 million 
reduction in bad debt expense, because of elevated levels 
of bad debt expense in 2008 and the impact of the Illinois 
bad debt rate adjustment mechanism (net of a related 
donation for customer assistance programs), a $6 million 
decrease in distribution system reliability expenditures, 
including reduced storm costs, and a favorable change in 
unrealized net MTM adjustments between periods, 
resulting from changes in the market value of investments 
used to support Ameren’s deferred compensation plans.  
Merchant Generation  

Other operations and maintenance expenses 
decreased $16 million in the Merchant Generation 
segment, as discussed below.  

Genco  
Genco’s other operations and maintenance expenses 
were comparable between years as employee severance 
costs and expenses recognized for the termination of a rail 
line extension project were reduced by lower plant 
maintenance costs.  
CILCO (AERG)  
Other operations and maintenance expenses 

decreased $22 million, primarily because of a $9 million 
reduction in plant maintenance costs and an $11 million 
reduction in asset impairment charges between years.  

EEI  
EEI’s other operations and maintenance expenses 
increased $10 million, primarily because of higher plant 
maintenance costs.  

2008 versus 2007  

Ameren  

Ameren’s other operations and maintenance 

expenses increased $170 million in 2008 compared with 
2007. Labor costs increased by $52 million and plant 
maintenance expenditures at coal-fired plants were higher 
by $43 million due to outages. A $30 million increase in 
distribution system reliability expenditures and a $10 
million increase in information technology costs also 
resulted in higher expenses. An unfavorable change of 
$22 million in unrealized net MTM adjustments resulting 
from changes in the market value of investments used to 
support Ameren’s deferred compensation plans reduced 
expenses between years. Bad debt expense increased by 
$10 million, primarily because of the transition to higher 
market-based rates at the Ameren Illinois Utilities. 
Additionally, in the first quarter of 2007, a $15 million 
accrual established in 2006 for contributions to assist 
customers through the Illinois Customer Elect electric rate 
increase phase-in plan was reversed because the plan 
was terminated. There was no similar item in 2008.  

Other operations and maintenance expenses also 

increased in 2008 by $14 million, because of asset 
impairment charges recorded during the fourth quarter of 
2008 to adjust the carrying value of CILCO’s (through 
AERG) Indian Trails and Sterling Avenue generation 
facilities to their estimated fair values as of December 31, 
2008. CILCO recorded an asset impairment charge of $12 
million related to the Indian Trails cogeneration facility as 
a result of the suspension of operations by the facility’s 
only customer. CILCORP recorded a $2 million 
impairment charge related to the Sterling Avenue CT 
based on the expected net proceeds to be generated from 
the sale of the facility in 2009. Because most of the 
Sterling Avenue asset carrying value was recorded at 
CILCORP, as a result of adjustments made during 
purchase accounting, the write-down of the carrying value 
of the Sterling Avenue CT did not result in an impairment 
loss at CILCO (AERG).  

Reducing the unfavorable effect of these items was a 
reduction of $10 million in employee benefit costs, due to 
changes in actuarial estimates, and an $18 million 
decrease in storm expenditures, primarily in UE’s service 
territory. Additionally, costs associated with the Callaway 
nuclear plant refueling and maintenance outage in 2008 
were $5 million lower than those for the refueling in 2007. 
Other operations and maintenance expenses were further 
reduced in 2008 by the MoPSC accounting order related 
to 2007 storms, as discussed above.  

Variations in other operations and maintenance 
expenses in Ameren’s and CILCO’s business segments 
and for the Ameren Companies between 2008 and 2007 
were as follows.  
Missouri Regulated (UE)  

UE’s other operations and maintenance expenses 
were higher by $22 million, primarily because of a $37 
million increase in labor costs and a $29 million increase 
in plant maintenance expenditures at coal-fired plants. An 
unfavorable

43 

  
change in unrealized net MTM adjustments resulting from 
changes in the market value of investments used to 
support Ameren’s deferred compensation plans and a $16 
million increase in distribution system reliability 
expenditures also resulted in incremental expenses.  

Reducing the impact of these items were the effect of 

the MoPSC accounting order discussed above, a 
decrease in injuries and damages expenses between 
years, and the reduced impact of the Callaway nuclear 
plant refueling and maintenance outage in 2008 compared 
with the refueling in 2007. Storm repair expenditures also 
decreased by $31 million, further reducing other 
operations and maintenance expenses.  

Illinois Regulated  

Other operations and maintenance expenses 

increased $77 million in the Illinois Regulated segment, as 
discussed below.  

CIPS  
Other operations and maintenance expenses 

increased $24 million. The increase was primarily because 
of an $11 million increase in distribution system reliability 
expenditures, including storm costs, along with increased 
labor costs and bad debt expense. Additionally, in the first 
quarter of 2007, CIPS reversed an accrual of $4 million 
established in 2006 for contributions to assist customers 
through the Illinois Customer Elect electric rate increase 
phase-in plan. There was no similar item in 2008.  

CILCO (Illinois Regulated)  
Other operations and maintenance expenses were 

higher by $8 million, primarily because of a $5 million 
increase in storm costs in 2008. Additionally, in the first 
quarter of 2007, CILCO (Illinois Regulated) reversed an 
accrual of $3 million established in 2006 for the Illinois 
Customer Elect electric rate increase phase-in plan 
contributions. There was no similar item in 2008. Lower 
employee benefit costs reduced the effect of these 
unfavorable items.  

IP  
Other operations and maintenance expenses 
increased $47 million, due, in part, to a $17 million 
increase in distribution system reliability expenditures, 
including storm costs. Labor costs and bad debt expense 
increased by $6 million each, and unrealized net MTM 
adjustments resulting from changes in the market value of 
investments used to support Ameren’s deferred 
compensation plans also increased other operations and 
maintenance expenses between years. Additionally, in the 
first quarter of 2007, IP reversed an $8 million accrual 
established in 2006 for the Illinois Customer Elect electric 
rate increase phase-in plan contributions. There was no 
similar item in 2008. Reducing the unfavorable effect of 
these items was a reduction in employee benefit costs.  

Merchant Generation  

Other operations and maintenance expenses 
increased $43 million in the Merchant Generation 
segment, as discussed below.  

Genco  
Other operations and maintenance expenses 

increased $12 million at Genco. Plant maintenance costs 
were higher by $9 million, due to scheduled outages, and 
labor costs increased by $5 million. Genco paid $3 million 
to the IPA in 2007 as part of the 2007 Illinois Electric 
Settlement Agreement. There was no similar item in 2008.  

CILCO (AERG)  
Other operations and maintenance expenses 
increased $25 million at CILCO (AERG), primarily 
because of a $12 million impairment charge recorded in 
2008 related to the Indian Trails cogeneration plant 
discussed above. Plant maintenance costs increased by 
$7 million, due to scheduled outages, and labor costs 
increased by $3 million. CILCO (AERG) paid $1.5 million 
to the IPA in 2007 as part of the 2007 Illinois Electric 
Settlement Agreement. There was no similar item in 2008.  

EEI  
Other operations and maintenance expenses were 

comparable in 2008 and 2007.  

Depreciation and Amortization  

2009 versus 2008  

Ameren  

Ameren’s depreciation and amortization expenses 
increased $40 million in 2009, as compared with 2008, 
because of items noted below at the Ameren Companies.  
Variations in depreciation and amortization expenses 
in Ameren’s and CILCO’s business segments and for the 
Ameren Companies between 2009 and 2008 were as 
follows.  

Missouri Regulated (UE)  

Depreciation and amortization expenses increased 

$28 million, primarily because of capital additions and 
amortization of regulatory assets that resulted from UE’s 
electric rate case in 2009.  

Illinois Regulated  

Depreciation and amortization expenses were 
comparable between years in the Illinois Regulated 
segment. As part of the consolidated electric and natural 
gas rate order issued by the ICC in September 2008, the 
ICC changed plant asset useful lives, effective October 1, 
2008. This resulted in reductions in depreciation expense 
at CIPS and CILCO (Illinois Regulated) and an increase in 
depreciation expense at IP. Capital additions partially 
offset the benefit of the rate order at CIPS and CILCO 
(Illinois Regulated) and further 

44 

  
increased depreciation and amortization expenses at IP. 
The net effect of the above items was an $18 million 
reduction in depreciation and amortization expenses at 
CILCO (Illinois Regulated) and a $14 million increase at 
IP. Depreciation and amortization expenses at CIPS were 
comparable between years.  

Merchant Generation  

Depreciation and amortization expenses increased 
$17 million in the Merchant Generation segment, primarily 
because of capital additions at CILCO (AERG) and $3 
million of expense recorded by Genco in the third quarter 
of 2009 for the retirement of two generation units at its 
Meredosia power plant. Depreciation and amortization 
expenses were comparable at EEI between years.  

2008 versus 2007  

Ameren  

Ameren’s depreciation and amortization expenses 

were comparable between periods. Increases in 
depreciation expense, resulting from capital additions in 
2008, were mitigated by a reduction in expense because 
of changes in the useful lives of plant assets resulting from 
rate orders in 2007 in Missouri and 2008 in Illinois, as 
discussed below.  

Variations in depreciation and amortization expenses 
in Ameren’s and CILCO’s business segments and for the 
Ameren Companies between 2008 and 2007 were as 
follows.  

Missouri Regulated (UE)  

Depreciation and amortization expenses decreased 

$4 million, primarily because of the extension of UE’s 
nuclear and coal-fired plants’ useful lives for purposes of 
calculating depreciation expense in conjunction with a 
MoPSC electric rate order effective June 2007. Reducing 
the benefit of this item was an increase in capital additions 
in 2008.  

Illinois Regulated  

Depreciation and amortization expenses were 
comparable in 2008 and 2007 in the Illinois Regulated 
segment. The effect of the consolidated electric and 
natural gas rate order issued by the ICC in 2008, as noted 
above, resulted in reductions in depreciation expense at 
CIPS and CILCO (Illinois Regulated) and an increase in 
depreciation expense at IP. Capital additions partially 
offset the benefit of the rate order at CIPS and CILCO 
(Illinois Regulated) and further increased depreciation and 
amortization expenses at IP.  

Merchant Generation  

Depreciation and amortization expenses increased 

$4 million in the Merchant Generation segment. 
Depreciation and amortization expenses increased $8 
million at CILCO (AERG) because of capital additions in 
2008. Genco’s depreciation and amortization expenses 
decreased $4 million, primarily because of extended 

useful lives resulting from a depreciation study completed 
in September 2007, partially mitigated by capital additions. 
EEI’s depreciation and amortization expenses were 
comparable between years.  

Taxes Other Than Income Taxes  

2009 versus 2008  

Ameren  

Ameren’s taxes other than income taxes increased 

$19 million, primarily because of higher property and 
payroll taxes.  

Variations in taxes other than income taxes in 
Ameren’s and CILCO’s business segments and for the 
Ameren Companies between 2009 and 2008 were as 
follows.  

Missouri Regulated (UE)  

Taxes other than income taxes increased $17 million, 

primarily because of higher property taxes.  

Illinois Regulated  

Taxes other than income taxes were comparable in 
2009 and 2008 in the Illinois Regulated segment and at 
CIPS, CILCO (Illinois Regulated), and IP.  

Merchant Generation  

Taxes other than income taxes were comparable 
between years in the Merchant Generation segment and 
at Genco, CILCO (AERG) and EEI.  

2008 versus 2007  

Ameren  

Ameren’s taxes other than income taxes increased 
$12 million, primarily because of higher property taxes and 
higher gross receipts taxes. Increases in property taxes 
were reduced by invested capital electricity distribution tax 
credits in the Illinois Regulated segment. These credits 
were related to payments made in a previous year.  
Variations in taxes other than income taxes in 
Ameren’s and CILCO’s business segments and for the 
Ameren Companies between 2008 and 2007 were as 
follows.  

Missouri Regulated (UE)  

UE’s taxes other than income taxes increased $6 

million, primarily because of higher property taxes.  

Illinois Regulated  

Taxes other than income taxes increased $5 million in 

the Illinois Regulated segment, primarily because of 
higher excise taxes at CIPS, CILCO (Illinois Regulated), 
and IP. Property taxes were comparable between years 
as increases in 2008 were mitigated by the favorable 
impact of the invested capital electricity distribution tax 
credits discussed above.  

45 

  
Merchant Generation  

Taxes other than income taxes were comparable in 

2008 and 2007 in the Merchant Generation segment and 
for Genco, CILCO (AERG) and EEI.  

Other Income and Expenses  

2009 versus 2008  

Ameren  

Other income and expenses were comparable in 2009 

and 2008. Miscellaneous expenses decreased as 
expenses associated with energy efficiency and customer 
assistance programs under the 2007 Illinois Electric 
Settlement Agreement were lower in 2009. However, 
miscellaneous income declined because of reduced 
interest income, partially offset by increased allowance for 
funds used during construction.  

Variations in other income and expenses in Ameren’s 

and CILCO’s business segments and for the Ameren 
Companies between 2009 and 2008 were as follows.  

Missouri Regulated (UE)  

Other income and expenses were comparable 

between periods.  

Illinois Regulated  

Other income and expenses decreased $9 million in 

the Illinois Regulated segment, and decreased at both 
CIPS and IP, primarily because of lower interest income. 
Decreased expenses associated with energy efficiency 
and customer assistance programs under the 2007 Illinois 
Electric Settlement Agreement mitigated this decrease. 
Other income and expenses at CILCO (Illinois Regulated) 
were comparable in 2009 and 2008.  

Merchant Generation  

Other income and expenses were comparable 
between years in the Merchant Generation segment and 
at Genco, CILCO (AERG) and EEI.  

2008 versus 2007  

Ameren  

Other income and expenses were comparable in 2008 

and 2007. Miscellaneous income increased $5 million, 
primarily because of an increase at UE in allowance for 
funds used during construction, reduced by lower interest 
income. Miscellaneous expense increased $6 million, 
primarily because of increased expenses associated with 
contributions to social programs.  

Variations in other income and expenses in Ameren’s 

and CILCO’s business segments and for the Ameren 
Companies between 2008 and 2007 were as follows.  

46 

Missouri Regulated (UE)  

Miscellaneous income increased $24 million, primarily 
because of an increase in allowance for funds used during 
construction. This increase resulted from higher rates and 
increased construction work in progress balances. 
Miscellaneous expense was comparable between years.  

Illinois Regulated  

Other income and expenses decreased $9 million in 

the Illinois Regulated segment and at CIPS, CILCO 
(Illinois Regulated) and IP, primarily because of lower 
interest income.  

Merchant Generation  

Other income and expenses in the Merchant 

Generation segment and at Genco, CILCO (AERG) and 
EEI were comparable in 2008 and 2007.  

Interest Charges  

2009 versus 2008  

Ameren  

Ameren’s interest charges increased $68 million 
because of items noted below at the Ameren Companies 
and because of the issuance of $425 million of senior 
notes at Ameren in May 2009.  

Variations in interest charges in Ameren’s and 

CILCO’s business segments and for the Ameren 
Companies between 2009 and 2008 were as follows.  

Missouri Regulated (UE)  

Interest charges increased $36 million, primarily 
because of the issuance of $350 million, $450 million, and 
$250 million of senior secured notes in March 2009, June 
2008, and April 2008, respectively. The amortization of 
fees related to new credit facilities entered into in the 
second quarter of 2009 also increased interest charges. 
The majority of the fees related to the new credit facilities 
are being amortized over a two-year period. Additionally, a 
reversal in interest charges previously accrued on 
uncertain tax positions due to favorable income tax 
settlements in 2008, with no similar item in 2009, had a 
negative impact on 2009. The maturity of $148 million of 
first mortgage bonds in May 2008 and refinancing of 
auction-rate environmental improvement revenue bonds in 
2008, along with a reduction of short-term borrowings, 
mitigated the impact of the above items.  

Illinois Regulated  

Interest charges increased $9 million in the Illinois 

Regulated segment because of the amortization of fees 
related to a new credit facility entered into in the second 
quarter of 2009 and as a result of matters as discussed 
below.  

CIPS  
Interest charges were comparable in 2009 and 2008. 

  
CILCO (Illinois Regulated)  
Interest charges increased $8 million, primarily 
because of the issuance of senior secured notes of $150 
million in December 2008 at a higher rate than the short-
term borrowings it refinanced.  

IP  
Interest charges were comparable between years. 
Increased interest charges resulting from the issuance of 
senior secured notes of $400 million and $337 million in 
October 2008 and April 2008, respectively, was mitigated 
as the proceeds of these issuances were used to 
refinance auction-rate pollution control revenue refunding 
bonds, which bore default rates ranging from 12% to 18%, 
and to reduce short-term borrowings.  

Merchant Generation  

Interest charges increased $20 million in the Merchant 

Generation segment, because of items discussed below. 
Additionally, CILCORP parent company recorded 
amortization of fees related to new credit facilities entered 
into in the second quarter of 2009 and had increased 
intercompany borrowings.  

Genco  
Interest charges increased $4 million, primarily 

because of the issuance of $300 million of senior 
unsecured notes in April 2008.  

CILCO (AERG)  
Interest charges increased $12 million, primarily 

because of increased intercompany borrowings.  

EEI  
Interest charges were comparable between years.  

2008 versus 2007  

Ameren  

Interest charges increased $17 million. Long-term 
debt issuances, net of maturities and redemptions, and 
the cost of refinancing auction-rate environmental 
improvement and pollution control revenue refunding 
bonds resulted in increased interest expense in 2008. 
These increases were reduced by income tax settlements 
in 2008.  

Variations in interest charges in Ameren’s and 

CILCO’s business segments and for the Ameren 
Companies between 2008 and 2007 were as follows.  

Missouri Regulated (UE)  

Interest charges were comparable between periods. 

Interest charges associated with the issuance of senior 
secured notes of $450 million, $250 million, and $425 
million in June 2008, April 2008, and June 2007, 
respectively, was  

mitigated by a reduction in short-term borrowings, which 
were reduced with proceeds from the senior secured 
notes financings. The proceeds from these senior secured 
notes financings were also used to refinance auction-rate 
environmental improvement revenue refunding bonds, and 
to fund the maturity of $148 million of first mortgage 
bonds, and to reduce short-term borrowings. Additionally, 
interest charges were reduced by $8 million because of a 
reversal of interest charges previously accrued on 
uncertain tax positions as a result of income tax 
settlements in 2008.  

Illinois Regulated  

Interest charges increased $12 million in the Illinois 

Regulated segment, as discussed below.  

CIPS  
Interest charges decreased $7 million, primarily 
because of reduced short-term borrowings and a $3 
million reduction from a reversal of interest charges 
previously accrued on uncertain tax positions as a result 
of an income tax settlement.  

CILCO (Illinois Regulated)  
Interest charges were comparable in 2008 and 2007.  

IP  
Interest charges increased $22 million, primarily 
because of the issuance of $400 million, $337 million, and 
$250 million of senior secured notes at IP in October 
2008, April 2008, and November 2007, respectively. The 
$337 million senior secured notes were issued to 
refinance auction-rate pollution control revenue refunding 
bonds, while proceeds from the other debt issuances were 
used to reduce short-term borrowings.  

Merchant Generation  

Interest charges decreased $8 million in the Merchant 

Generation segment, as discussed below.  

Genco  
Interest charges were comparable between periods. 
Increased interest charges resulting from the issuance of 
$300 million of senior unsecured notes in April 2008 was 
mitigated by a corresponding reduction in short-term 
borrowings. Additionally, interest charges were reduced by 
$3 million as a result of an income tax settlement.  

CILCO (AERG)  
Interest charges decreased $4 million at CILCO 

(AERG), primarily because of reduced short-term 
borrowings.  

EEI  
Interest charges were comparable in 2008 and 2007.

47 

  
  
Income Taxes  

The following table presents effective income tax rates 

by segment for the years ended December 31, 2009, 
2008, and 2007:  

Ameren ..............................................................  
Missouri Regulated ............................................  
Illinois Regulated ...............................................  
Merchant Generation .........................................  

2009 
  35% 
  33   
  37   
  38   

2008 
34%   
36   
30   
36   

2007 
34% 
33   
32   
37   

2009 versus 2008  

Ameren  

Ameren’s effective tax rate in 2009 was higher than 
the effective tax rate in 2008 due to variations discussed 
below. Variations in effective tax rates for Ameren’s and 
CILCO’s business segments and for the Ameren 
Companies between 2009 and 2008 were as follows.  

Missouri Regulated (UE)  

UE’s effective tax rate was lower, primarily because of 

higher favorable net amortization of property-related 
regulatory assets and liabilities, partially mitigated by 
changes to reserves for uncertain tax positions.  

The effective tax rate increased, primarily because of 

the decreased impact of Internal Revenue Code 
Section 199  
production activity deductions, along with changes to 
reserves for uncertain tax positions.  

CILCO (AERG)  
The effective tax rate was lower, primarily because of 

the increased impact of Internal Revenue Code 
Section 199 production activity deductions, along with 
changes to reserves for uncertain tax positions.  

2008 versus 2007  

Ameren  

Ameren’s effective tax rate was comparable in 2008 

and 2007. Favorable impacts of state audit settlements 
and changes in state apportionment were offset by 
unfavorable permanent items related to company-owned 
life insurance as well as other variations discussed below 
at the Ameren Companies.  

Variations in effective tax rates for Ameren’s and 

CILCO’s business segments and for the Ameren 
Companies between 2008 and 2007 were as follows.  

Illinois Regulated  

Missouri Regulated (UE)  

The effective tax rate was higher in the Illinois 
Regulated segment because of items detailed below.  

CIPS  
The effective tax rate increased, primarily because of 

the decreased impact of net amortization of property-
related regulatory assets and liabilities, investment tax 
credit amortization, and permanent items on higher pretax 
book income.  

CILCO (Illinois Regulated)  
The effective tax rate was higher, primarily because of 

the decreased impact of permanent benefits, net 
amortization of property-related regulatory assets and 
liabilities, and investment tax credit amortization on higher 
pretax book income.  

IP  
The effective tax rate decreased, primarily because of 

the impact of permanent items on higher pretax book 
income, along with changes to reserves for uncertain tax 
positions.  

Merchant Generation  

The effective tax rate was higher in the Merchant 
Generation segment because of items detailed below.  

Genco  

The effective tax rate increased, primarily because of 

lower favorable net amortization of property-related 
regulatory assets and liabilities, along with decreased 
Internal Revenue Code Section 199 production activity 
deductions in 2008.  

Illinois Regulated  

The effective tax rate decreased in the Illinois 
Regulated segment because of items detailed below.  

CIPS  
The effective tax rate was lower, primarily because of 

the impact of net amortization of property-related 
regulatory assets and liabilities and permanent items on 
lower pretax income in 2008.  

CILCO (Illinois Regulated)  
The effective tax rate was higher, primarily because of 

lower tax credits, lower favorable net amortization of 
property-related regulatory assets and liabilities, and lower 
favorable permanent benefits related to company-owned 
life insurance.  

IP  
The effective tax rate increased, primarily because of 

lower favorable net amortization of property-related 
regulatory assets and liabilities, lower tax credits, and the 
impact of other permanent items as well as increased 
reserves for uncertain tax positions on lower pretax book 
income in 2008. 

48 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Merchant Generation  

The effective tax rate decreased in the Merchant 
Generation segment because of items detailed below.  

Genco  
The effective tax rate was lower, primarily because of 
the increased impact of Internal Revenue Code Section 199 
production activity deductions and research tax credits.  

LIQUIDITY AND CAPITAL RESOURCES  

CILCO (AERG)  
The effective tax rate increased, primarily because of 

the impact of Internal Revenue Code Section 199 
production activity deductions.  

The tariff-based gross margins of Ameren’s rate-regulated utility operating companies (UE, CIPS, CILCO (Illinois 
Regulated) and IP) continue to be a principal source of cash from operating activities for Ameren and its rate-regulated 
subsidiaries. A diversified retail customer mix of primarily rate-regulated residential, commercial, and industrial classes 
and a commodity mix of natural gas and electric service provide a reasonably predictable source of cash flows for 
Ameren, UE, CIPS, CILCO (Illinois Regulated) and IP. For operating cash flows, Genco and AERG rely on power sales to 
Marketing Company, which sold power through financial contracts that were part of the 2007 Illinois Electric Settlement 
Agreement and various power procurement processes in the non-rate-regulated Illinois market. Marketing Company also 
sells power through other primarily market-based contracts with wholesale and retail customers. In addition to cash flows 
from operating activities, the Ameren Companies use available cash, credit facilities, money pool, or other short-term 
borrowings from affiliates to support normal operations and other temporary capital requirements. The use of operating 
cash flows and credit facility or short-term borrowings to fund capital expenditures and other investments may periodically 
result in a working capital deficit, as was the case at December 31, 2009, for Genco and CILCO. The Ameren Companies 
may reduce their credit facility or short-term borrowings with cash from operations or discretionarily with long-term 
borrowings, or in the case of Ameren subsidiaries, with equity infusions from Ameren. The Ameren Companies expect to 
incur significant capital expenditures over the next five years as they comply with environmental regulations and make 
significant investments in their electric and natural gas utility infrastructure to improve overall system reliability. Ameren 
intends to finance those capital expenditures and investments with a blend of equity and debt so that it maintains a capital 
structure in its rate-regulated businesses, of approximately 50% to 55% equity. We plan to implement our long-term 
financing plans for debt, equity, or equity-linked securities in order to finance our operations appropriately, meet 
scheduled debt maturities, and maintain financial strength and flexibility.  

In 2008 and 2009, the global capital and credit markets experienced extreme volatility. See Outlook for a discussion 
of the implications of this volatility for our industry as a whole, including the Ameren Companies, and how we addressed 
these issues.  

The following table presents net cash provided by (used in) operating, investing and financing activities for the years 

ended December 31, 2009, 2008 and 2007:  

Ameren(a)  ......................................................  $    1,977  
972  
UE  ................................................................  
191  
CIPS .............................................................  
232  
Genco ...........................................................  
263  
CILCO ...........................................................  
409  
IP   ................................................................  

2009 

Net Cash Provided By 
Operating Activities 
2008 
$    1,524  
543  
101  
246  
207  
178  

2007 
$    1,108  
587  
14  
255  
74  
30  

Net Cash (Used In) 
Investing Activities 
2008 

2009 

2007 

$   (1,789)   $    (2,097)      $  (1,468)   
(700)   
(1,033)     
(42)   
(57)     
(210)   
(330)     
(212)   
(317)     
(186)   
(246)     

(955)    
(68)    
(349)    
(153)    
(189)    

Net Cash Provided By 
(Used In) Financing Activities 
2008 
2009 
2007 
$   342  
$   578  
$  310  
  250  
  297  
  305  
(95 ) 
48  
(70 ) 
  121  
(44) 
84  
(22 ) 
  141  
  104  
(80 ) 
  162  
  112  

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

Cash Flows from Operating Activities  

2009 versus 2008  
Ameren’s cash from operating activities increased in 

2009 compared with 2008. Operating activities associated 
with the December 2005 Taum Sauk incident resulted in a 
$256 million increase in cash during 2009, compared with 
2008. The 2009 increase was a result of a $65 million 
increase in insurance recoveries received as well as a 
$191 million reduction in cash payments compared with 
2008. See Note 15 – Commitments and Contingencies 
under Part II, Item 8, of this report for information about 
the Taum Sauk property insurance settlement agreement 

with all but three of the property insurance carriers and the 
related settlement payment received during 2009. Other 
factors contributing to the increase in cash from operating 
activities during 2009, compared with 2008, included a 
$198 million decrease in the cost of natural gas purchased 
for inventories because of lower prices, a $97 million 
decrease, net of refunds, in income tax payments primarily 
at UE as discussed below, and an increase in electric costs 
over-recovered from Illinois customers under cost recovery 
mechanisms. Additionally, as discussed in Results of 
Operations, less cash was used for operations and

49 

  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
maintenance activities because many plant-related projects 
were either reduced, deferred, or cancelled as well as the 
absence of a Callaway nuclear plant refueling and 
maintenance outage in 2009. Factors reducing the increase 
in cash from operating activities during 2009, compared with 
2008, included a $68 million increase in interest payments, a 
decrease in natural gas costs over-recovered from customers 
under the PGA, a $35 million increase in pension and 
postretirement plan contributions, lower electric margins, as 
discussed in Results of Operations, including the absence in 
2009 of the 2008 lump-sum settlement payment received by 
Genco from a coal mine owner for the early termination of a 
coal supply contract, a $21 million decrease in customer 
advances for construction, $16 million of employee 
severance payments as a result of the 2009 voluntary and 
involuntary separation programs, an increase in annual 
incentive compensation payments, and an $8 million increase 
in cash payments for major storm restoration costs.  

UE’s cash from operating activities increased in 2009 

compared with 2008. The increase was primarily due to net 
income tax refunds of $208 million in 2009 compared with net 
income tax payments of $130 million in 2008, and a 
$256 million increase in cash from operating activities 
associated with the December 2005 Taum Sauk incident, as 
discussed above. The significant change in income taxes is 
primarily a result of an acceleration of deductions due to 
economic stimulus legislation and a change in tax treatment 
of electric generation plant expenditures. Other factors 
contributing to the increase in cash from operating activities 
during 2009, compared with 2008, included a $20 million 
decrease in the cost of natural gas purchased for inventories 
because of lower prices, higher electric margins, as 
discussed in Results of Operations, and an increase in 
natural gas costs over-recovered from customers under the 
PGA. Additionally, as discussed in Results of Operations, 
less cash was used for operations and maintenance 
activities, because several plant-related projects were either 
reduced, deferred, or cancelled as well as the absence of a 
Callaway nuclear plant refueling and maintenance outage in 
2009. Factors reducing the increase in cash from operating 
activities during 2009, compared with 2008, included the 
collection of an $85 million affiliate receivable in 2008 that did 
not occur in 2009, a $39 million increase in interest 
payments, a $16 million increase in pension and other 
postretirement plan contributions, a $10 million increase in 
energy efficiency expenditures for new customer programs, a 
$6 million increase in major storm restoration costs, and $6 
million of employee severance payments as a result of the 
2009 voluntary and involuntary separation programs.  

CIPS’ cash from operating activities increased in 2009 
compared with 2008. Factors contributing to the increase in 
cash from operating activities during 2009, compared with 
2008, included a $57 million net reduction in collateral posted 
with suppliers due in part to improved credit ratings, a 
$40 million decrease in the cost of natural gas purchased for 
inventories because of lower prices, higher electric and 
natural gas margins as discussed in Results of Operations, 
an increase in electric costs over-recovered from customers 
under cost recovery mechanisms, and a $5 million decrease 

in interest payments. Additionally, more cash was collected in 
2009 from receivables, because of colder weather in the 
fourth quarter of 2008, compared with 2007. Factors reducing 
the increase in cash from operating activities during 2009, 
compared with 2008, included net income tax payments of 
$24 million in 2009, compared with net income tax refunds of 
$21 million in 2008, a decrease in natural gas costs over-
recovered from customers under the PGA, and a $5 million 
increase in major storm restoration costs.  

Genco’s cash from operating activities decreased in 
2009 compared with 2008. Factors contributing to a decrease 
in cash from operating activities during 2009, compared with 
2008, included lower electric margins as discussed in Results 
of Operations, including the 2008 lump-sum settlement 
payment received from a coal mine owner as well as the 
absence of $7 million, net of premiums, of replacement 
power insurance recoveries received in 2008 from an affiliate 
as the policy was not renewed. Other factors contributing to 
the decrease in cash from operating activities during 2009, 
compared with 2008, included a $23 million increase in 
income tax payments, net of refunds, a $6 million increase in 
interest payments, and $4 million of employee severance 
payments as a result of the 2009 voluntary and involuntary 
separation programs. Factors offsetting the decrease in cash 
from operating activities during 2009, compared with 2008, 
included reduced coal purchases in 2009 as generation 
levels declined and a $10 million reduction in funding 
required by the 2007 Illinois Electric Settlement Agreement.  

CILCO’s cash from operating activities increased in 2009 

compared with 2008. Factors contributing to the increase in 
cash from operating activities during 2009, compared with 
2008, included higher electric margins as discussed in 
Results of Operations, a $58 million decrease in the cost of 
natural gas purchased for inventories because of lower 
prices, and a $45 million net reduction in collateral posted 
with suppliers due in part to improved credit ratings. 
Additionally, more cash was collected in 2009 from 
receivables, because of colder weather in the fourth quarter 
of 2008, compared with 2007. Factors reducing the increase 
in cash from operating activities during 2009, compared with 
2008, included net income tax payments of $82 million in 
2009, compared with net income tax refunds of $15 million in 
2008, increased coal purchases to build inventories at the 
Duck Creek generating facility as a result of switching coal 
blends in 2009, a $6 million increase in pension and other 
postretirement plan contributions, a $6 million increase in 
interest payments, the absence of $5 million, net of 
premiums, of replacement power insurance recoveries 
received in 2008 from an affiliate as the policy was not 
renewed, a decrease in natural gas costs over-recovered 
from customers under the PGA, and an increase in annual 
incentive compensation payments.  

IP’s cash from operating activities increased in 2009 
compared with 2008. Factors contributing to the increase in 
cash from operating activities during 2009, compared with 
2008, included higher electric and natural gas margins as 
discussed in Results of Operations, an $80 million decrease 
in the cost of natural gas purchased for inventories because

50 

  
  
of lower prices, a $74 million net decrease in collateral 
posted with suppliers due in part to improved credit ratings, 
an increase in electric costs over-recovered from customers 
under cost recovery mechanisms, and a $3 million decrease 
in major storm restoration costs. Additionally, more cash was 
collected in 2009 from receivables, because of colder 
weather in the fourth quarter of 2008, compared with 2007. 
Factors reducing the increase in cash from operating 
activities during 2009, compared with 2008, included net 
income tax payments of $22 million in 2009, compared with 
net income tax refunds of $43 million in 2008, a decrease in 
natural gas cost over-recovered from customers under the 
PGA, a $22 million increase in interest payments, and a $15 
million reduction in customer advances for construction.  

2008 versus 2007  

Ameren’s cash from operating activities increased in 
2008, compared to 2007, primarily because of higher electric 
and natural gas margins as discussed in Results of 
Operations, a $177 million decrease in income tax payments 
(net of refunds), and improved collections of receivables in 
2008. The reduction in income tax payments was largely 
attributable to higher depreciation allowed for tax purposes. 
In 2007, receivables from the Ameren Illinois Utilities had 
increased due to the January 2, 2007, electric rate increases, 
related uncertainty surrounding a potential electric settlement 
agreement, and deterioration of collections. However, 
collections improved in 2008. Additionally, Ameren 
experienced an $87 million benefit to cash flows for 2008 as 
compared with 2007 because of the timing of cash receipts 
for MISO receivables. The 2007 Illinois Electric Settlement 
Agreement also had a positive effect on cash from operations 
in 2008 compared with 2007. Cash outflows in accordance 
with the settlement, net of reimbursements from generators, 
were $84 million less in 2008 than in 2007. See Note 2 – 
Rate and Regulatory Matters under Part II, Item 8, of this 
report for a discussion of the 2007 Illinois Electric Settlement 
Agreement. In addition, Ameren’s cash flows from operations 
increased in 2008 compared with 2007 because of a 
$40 million reduction in storm restoration costs, over-
recovery under the PGAs, and a $27 million payment 
received by Genco in 2008 as part of a coal contract 
settlement for increased costs for coal and transportation that 
Genco expected to incur in 2009 because of the premature 
closure of an Illinois mine at the end of 2007. See Note 1 – 
Summary of Significant Accounting Policies under Part II, 
Item 8, for information on the coal contract settlement. 
Factors that offset, in part, the favorable variance in cash 
flows from operations in 2008 were a $93 million increase in 
cash payments related to the December 2005 Taum Sauk 
incident, net of insurance recoveries, an increase in natural 
gas inventories resulting from price increases, higher interest 
payments, and higher levels of collateral posted with 
suppliers.  

At UE, cash from operating activities decreased in 2008, 

compared to 2007. The decrease is primarily due to a 
$24 million increase in net income tax payments in 2008, 
lower electric margins, increased system reliability 
expenditures as discussed in Results of Operations, and 

higher levels of net collateral posted with suppliers. Also 
contributing to the unfavorable variance in 2008 was a 
$93 million increase in cash payments related to the 
December 2005 Taum Sauk incident, net of insurance 
recoveries, and a $146 million net decrease in affiliate 
payables. Factors increasing cash from operations included a 
$34 million decrease in payments for storm restorations, a 
decrease in other operations and maintenance expenditures 
related to the Callaway nuclear plant refueling and 
maintenance outage in 2008 as compared with the 2007 
refueling and maintenance outage, reduction in interest 
payments, and the collection in 2008 of an $85 million affiliate 
receivable. In addition, cash flows from operations increased 
in 2008 compared with 2007 because of the timing of cash 
receipts for MISO receivables.  

At CIPS, cash from operating activities increased in 2008 

compared with 2007. The increase was primarily due to net 
income tax refunds of $21 million in 2008, compared with net 
income tax payments of $44 million in 2007, an increase in 
gas cost over-recovery from customers under the PGA, a $7 
million increase in customer advances for construction, and 
favorable fluctuations in receivables and payables. In 2007, 
receivables increased due to the January 2, 2007, electric 
rate increases, related uncertainty surrounding a potential 
settlement agreement, and deterioration of collections. 
However, collections improved in 2008. The 2007 Illinois 
Electric Settlement Agreement also had a positive effect on 
cash from operations in 2008 compared with 2007. CIPS’ 
cash outflows from the settlement, net of reimbursements 
from generators, were $26 million less in 2008 than in 2007. 
CIPS experienced favorable fluctuations in intercompany 
receivable and payable balances resulting from changes in 
its year-end 2008 income tax position and a receivable 
related to the 2007 Illinois Electric Settlement Agreement 
compared with 2007. Partially offsetting the favorable 
variance in cash flow from operations was a larger increase 
in natural gas inventories in 2008 than in 2007, a decrease in 
electric costs over-recovered from customers, and higher net 
levels of collateral posted with suppliers.  

Genco’s cash from operating activities decreased in 
2008 compared with 2007 primarily due to an increase in fuel 
inventory and an increase in net income tax payments of 
$13 million. Reducing the unfavorable variance in cash flow 
from operations were higher electric margins, a payment from 
an Illinois coal mine owner for the premature closure of an 
Illinois mine, as discussed above, and a $6 million reduction 
in funding required by the 2007 Illinois Electric Settlement 
Agreement in 2008 compared with 2007.  

CILCO’s cash from operating activities increased in 
2008, compared with 2007. The increase was primarily due 
to net income tax refunds of $15 million in 2008 compared 
with net income tax payments of $35 million in 2007, higher 
electric margins, a reduction of coal inventory at AERG, an 
increase in gas cost recovered from customers under a PGA, 
an increase in electric cost over-recovered from customers, 
and favorable fluctuations in receivables and payables. In 
2007, receivables increased due to the January 2, 2007, 
electric rate increases, related uncertainty surrounding a  

51 

  
potential settlement agreement, and deterioration of 
collections. However, collections improved in 2008. The 2007 
Illinois Electric Settlement Agreement also had a positive 
effect on cash from operations in 2008 compared with 2007. 
The cash outflows related to the settlement, including 
AERG’s obligation, were $16 million lower in 2008 than in 
2007. Partially offsetting these increases in cash from 
operations were a larger increase in natural gas inventories 
during 2008 compared with 2007, as both price and volumes 
increased, and higher net levels of collateral posted with 
suppliers.  

IP’s cash from operating activities increased in 2008, 

compared with 2007. The increase was primarily due to net 
income tax refunds of $43 million in 2008, compared with net 
income tax payments of $18 million in 2007, increased 
electric and natural gas margins, an increase in gas cost 
recovered from customers under a PGA, an increase in 
electric power costs over-recovered from customers, a 
$7 million increase in customer advances for construction, 
and favorable fluctuations in receivables and payables. In 
2007, receivables increased due to the January 2, 2007, 
electric rate increases, related uncertainty surrounding a 
potential settlement agreement, and deterioration of 
collections. However, collections improved in 2008. The 2007 
Illinois Electric Settlement Agreement also had a positive 
effect on cash from operations in 2008 compared to 2007. IP 
cash outflows related to the settlement, net of 
reimbursements from generators, were $35 million lower in 
2008 than in 2007. IP experienced favorable fluctuations in 
intercompany receivable and payable balances resulting from 
changes in its year-end 2008 income tax position and a 
receivable related to the 2007 Illinois Electric Settlement 
Agreement compared with 2007. In addition, operating cash 
required for major repairs in response to 2008 storms was $8 
million less than major storm repairs in 2007. Partially 
offsetting these increases to operating cash flows were a 
$10 million increase in interest payments and higher net 
levels of collateral posted with suppliers.  

Pension Funding  

Ameren’s pension plans are funded in compliance with 

income tax regulations and to meet federal funding or 
regulatory requirements. As a result, Ameren expects to fund 
its pension plans at a level equal to the greater of the pension 
expense or the legally required minimum contribution. 
Considering Ameren’s assumptions at December 31, 2009, 
its investment performance in 2009, and its pension funding 
policy, Ameren expects to make annual contributions of 
$75 million to $225 million in each of the next five years, with 
aggregate estimated contributions of $740 million. We expect 
UE’s, CIPS’, Genco’s, CILCO’s, and IP’s portion of the future 
funding requirements to be 66%, 6%, 9%, 9% and 10%, 
respectively. These amounts are estimates. They may 
change with actual investment performance, changes in 
interest rates, changes in our assumptions, any pertinent 
changes in government regulations, and any voluntary 
contributions. In 2009, Ameren contributed $99 million to its 
pension plans. See Note 11 – Retirement Benefits under Part 
II, Item 8, of this report and Outlook for additional information.  

Cash Flows from Investing Activities  

2009 versus 2008  

Ameren used less cash for investing activities in 2009 

than in 2008. Net cash used for capital expenditures 
decreased in 2009 as a result of efforts to reduce, defer or 
cancel capital expenditure programs in light of economic 
conditions and the completion of power plant scrubber 
projects in the Merchant Generation business. Additionally, a 
$93 million decrease in nuclear fuel expenditures related to 
timing of purchases and a $10 million decrease in emission 
allowance purchases, because of lower prices and lower 
generation levels as well as reduced emission levels resulting 
from completion of plant scrubber projects in 2009, benefited 
cash during 2009.  

UE’s cash used in investing activities decreased during 

2009, compared with 2008. Nuclear fuel expenditures 
decreased $93 million as a result of the timing of purchases. 
Cash used in investing activities in 2009 did not benefit from 
the receipt of $36 million in proceeds from intercompany note 
receivables with Ameren, and one of its subsidiaries, as 
occurred during 2008. Capital expenditures were consistent 
year over year. Reductions in planned capital expenditures 
for distribution system and power plant improvements in 2009 
were offset by increased expenditures to repair severe storm 
damage and $93 million of Taum Sauk rebuild expenditures.  

CIPS’ cash used in investing activities during 2009 

increased compared with 2008. Capital expenditures 
increased $14 million in 2009 from 2008 primarily because of 
increased capital expenditures to repair severe storm 
damage.  

Genco’s cash used in investing activities increased in 

2009 compared with 2008 because of $73 million of net 
money pool advances in 2009. Capital expenditures 
decreased $40 million, principally because of reduced 
spending related to power plant scrubber projects. One 
scrubber project was completed in November 2009 and a 
second scrubber project is estimated to be completed in 
2010. Emission allowance purchases decreased $11 million, 
because of lower prices and lower generation levels as well 
as reduced emission levels resulting from the completion of a 
plant scrubber project in 2009, which resulted in a benefit to 
cash in 2009.  

CILCO’s cash used in investing activities decreased in 

2009, compared with 2008, as a result of a $165 million 
decrease in capital expenditures, primarily because of the 
completion of a power plant scrubber project in March 2009 
and other reductions in capital expenditures at AERG.  

IP’s cash used in investing activities decreased in 2009 

compared with 2008, primarily as a result of money pool 
activity. During 2009, IP received a net repayment of 
$44 million in money pool advances compared with 
$44 million of net contributions during 2008. Partially 
offsetting this benefit to cash was an increase in advances to 
AITC for construction under a joint ownership agreement. IP 
received funding for this construction under a generator 
interconnection agreement related to on-going transmission 
upgrade projects.  

52 

  
  
2008 versus 2007  
Ameren used more cash for investing activities in 
2008, than in 2007. Net cash used for capital expenditures 
increased in 2008 as a result of power plant scrubber 
projects, upgrades at various power plants, and reliability 
improvements of the transmission and distribution system. 
Additionally, increased purchases and higher prices 
resulted in a $105 million increase in nuclear fuel 
expenditures.  

UE’s cash used in investing activities increased during 

2008, compared with 2007. Nuclear fuel expenditures 
increased $105 million resulting from increased purchases 
for future refueling outages at its Callaway nuclear plant 
and higher prices. In addition, capital expenditures 
increased $249 million. This increase was a result of 
increased spending related to a power plant scrubber 
project, reliability improvements of the transmission and 
distribution system, and various plant upgrades. This 
increase was partially offset by UE’s receipt of $36 million 
in proceeds from intercompany note receivables with 
Ameren, and one of its subsidiaries.  

CIPS’ cash used in investing activities during 2008 

increased, compared with 2007. Capital expenditures 
increased $17 million in 2008 from 2007, primarily 
because of reliability improvements to the transmission 
and distribution system. During both years, this was offset 
by cash received from payments on an intercompany note 
receivable from Genco.  

Genco’s cash used in investing activities increased in 
2008 compared with 2007. Capital expenditures increased 
$126 million, principally because of a power plant 
scrubber project. This increase was offset, in part, by a $7 
million decrease in emission allowance purchases.  

CILCO’s cash used in investing activities increased in 

2008, compared with 2007. Cash used in investing 
activities increased as a result of a $65 million increase in 
capital expenditures, primarily because of a power plant 
scrubber project and plant upgrades at AERG. The receipt 
of net repayments of money pool advances in 2007 
compared to 2008 also increased cash flows used in 
investing activities in 2008.  

IP’s cash used in investing activities increased in 2008 

compared with 2007. Capital expenditures increased by 
$8 million in 2008 from 2007, primarily because of 
reliability improvements to the transmission and 
distribution system. Net money pool advances increased 
by $44 million in 2008 compared with 2007.  

Capital Expenditures  

The following table presents the capital expenditures 

2009 

by the Ameren Companies for the years ended 
December 31, 2009, 2008, and 2007:  
Capital Expenditures 
Ameren(a)  ................................   $    1,704   
872   
UE  ..........................................    
110   
CIPS .......................................    
277   
Genco .....................................    
63   
CILCO (Illinois Regulated) .......    
CILCO (AERG) ........................    
91   
186   
IP   ..........................................    
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
Ameren’s 2009 capital expenditures principally 

2008 
$    1,896   
874   
96   
317   
61   
258   
186   

2007 
$    1,381 
625 
79 
191 
64 
190 
178 

(a) 

consisted of the following expenditures at its subsidiaries. 
UE spent $173 million toward a scrubber at one of its 
power plants and $93 million toward the Taum Sauk 
rebuild, and it incurred storm-related expenditures of $78 
million. CIPS, CILCO and IP incurred storm-related 
expenditures of $29 million, $3 million, and $5 million, 
respectively. At Genco and AERG, there were cash 
outlays of $169 million and $38 million, respectively, for 
power plant scrubber projects. The scrubbers are 
necessary to comply with environmental regulations. 
Other capital expenditures were made principally to 
maintain, upgrade, and expand the reliability of the 
transmission and distribution systems of UE, CIPS, CILCO 
and IP as well as various plant upgrades.  

Ameren’s 2008 capital expenditures principally 

consisted of the following expenditures at its subsidiaries. 
UE spent $149 million toward a scrubber at one of its 
power plants, and incurred storm-related expenditures of 
$12 million. CIPS and IP incurred storm-related 
expenditures of $7 million and $8 million, respectively. At 
Genco and AERG, there were cash outlays of $205 million 
and $137 million, respectively, for power plant scrubber 
projects. The scrubbers are necessary to comply with 
environmental regulations. Other capital expenditures 
were made principally to maintain, upgrade, and expand 
the reliability of the transmission and distribution systems 
of UE, CIPS, CILCO, and IP as well as various plant 
upgrades.  

Ameren’s 2007 capital expenditures principally 

consisted of the following expenditures at its subsidiaries. 
UE spent $101 million toward a scrubber at one of its 
power plants, and incurred storm-related expenditures of 
$56 million. IP incurred storm-related expenditures of $24 
million. At Genco and AERG, there were cash outlays of 
$102 million and $76 million, respectively, for power plant 
scrubber projects. In conjunction with the scrubber project, 
AERG also made expenditures for a power plant boiler 
upgrade of $45 million. Other capital expenditures were 
made principally to maintain, upgrade, and expand the 
reliability of the transmission and distribution systems of 
UE, CIPS, CILCO, and IP as well as various plant 
upgrades. 

53 

  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
In February 2008, the U.S. Court of Appeals for the 

District of Columbia issued a decision that vacated the 
federal Clean Air Mercury Rule. The court ruled that the EPA 
erred in the method it used to remove electric generating 
units from the list of sources subject to the MACT 
requirements under the Clean Air Act. In February 2009, the 
U.S. Supreme Court denied a petition for review filed by a 
group representing the electric utility industry. The impact of 
this decision is that the EPA will move forward with a MACT 
standard for mercury emissions and other hazardous air 
pollutants, such as acid gases. In a consent order, the EPA 
agreed to propose the regulation by March 2011 and to 
finalize the regulation by November 2011. Compliance is 
expected to be required in 2015. We cannot predict at this 
time the estimated capital or operating costs for compliance 
with such future environmental rules.  

In July 2008, the U.S. Court of Appeals for the District of 

Columbia issued a decision that vacated the federal Clean 
Air Interstate Rule. The court ruled that the regulation 
contained several fatal flaws, including a regional cap-and-
trade program that cannot be used to facilitate the attainment 
of ambient air quality standards for ozone and fine particulate 
matter. In September 2008, the EPA, as well as several 
environmental groups, a group representing the electric utility 
industry, and the National Mining Association, all filed 
petitions for rehearing with the U.S. Court of Appeals. In 
December 2008, the U.S. Court of Appeals essentially 
reversed its July 2008 decision to vacate the federal Clean 
Air Interstate Rule. The U.S. Court of Appeals granted the 
EPA petition for reconsideration and remanded the rule to the 
EPA for further action to remedy the rule’s flaws in 
accordance with the U.S. Court of Appeals’ July 2008 opinion 
in the case. The impact of the decision is that the existing 
Illinois and Missouri rules to implement the federal Clean Air 
Interstate Rule will remain in effect until the federal Clean Air 
Interstate Rule is revised by the EPA, at which point the 
Illinois and Missouri rules may be subject to change. The 
EPA has stated that it expects to issue a new proposed 
version of the Clean Air Interstate Rule in 2010 and a final 
version in 2011.  

The state of Missouri has adopted rules to implement the 

federal Clean Air Interstate Rule for regulating SO2 and NOx 
emissions from electric generating units. The rules are a 
significant part of Missouri’s plan to attain existing ambient 
standards for ozone and fine particulates, as well as meeting 
the federal Clean Air Visibility Rule. The rules are expected to 
reduce NOx emissions by 30% and SO2 emissions by 75% by 
2015. As a result of the Missouri rules, UE will use 
allowances and install pollution control equipment. UE’s costs 
to comply with SO2 emission reductions required by the 
Clean Air Interstate Rule could increase materially if the EPA 
determines that existing allowances granted to sources under 
the Acid Rain Program cannot be used for compliance with 
the Clean Air Interstate Rule, or if a new allowance program 
is mandated by revisions to the Clean Air Interstate Rule. 
Missouri also adopted rules to implement the federal

The following table estimates the capital expenditures 
that will be incurred by the Ameren Companies from 2010 
through 2014, including construction expenditures, 
capitalized interest for the Merchant Generation business, 
allowance for funds used during construction for our rate-
regulated utility business, and estimated expenditures for 
compliance with environmental standards:  

2010 

2011 – 2014 

Total 

(a) 

340 -    
690 -    
250 -    
130 -    
670 -    
330 -    
125 -    

UE  ....................................  $ 
CIPS .................................   
Genco ...............................   
CILCO (Illinois  

695   $ 2,565 -   $  3,465   $ 3,260 -   $   4,160 
435 -    
460    
95    
555 
800 -     1,040 
930    
110    
310 -    
340    
60    
Regulated) ...................   
400 
CILCO (AERG) ..................   
135 -    
175    
5    
180 
IP   ....................................   
845 -     1,085 
910    
175    
EEI ....................................   
340 -    
450    
10    
460 
Other .................................   
175 -    
170    
50    
220 
Ameren(a)  ..........................  $   1,200   $5,100 -   $   6,900   $ 6,300 -   $  8,100 
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
UE’s estimated capital expenditures include 
transmission, distribution, and generation-related 
investments, as well as expenditures for compliance with 
environmental regulations discussed below. CIPS’, CILCO’s 
(Illinois Regulated), and IP’s estimated capital expenditures 
are primarily for electric and natural gas transmission and 
distribution-related investments. Genco’s estimated capital 
expenditures are primarily for compliance with environmental 
regulations and upgrades to existing coal and gas-fired 
generating facilities. CILCO’s (AERG) estimate includes 
capital expenditures primarily for compliance with 
environmental regulations at its generating facilities.  

We continually review our generation portfolio and 
expected power needs. As a result, we could modify our plan 
for generation capacity, which could include changing the 
times when certain assets will be added to or removed from 
our portfolio, the type of generation asset technology that will 
be employed, and whether capacity or power may be 
purchased, among other things. Any changes that we may 
plan to make for future generating needs could result in 
significant capital expenditures or losses being incurred, 
which could be material.  

Environmental Capital Expenditures  

Ameren, UE, Genco, AERG and EEI will incur significant 
costs in future years to comply with existing federal EPA and 
state regulations regarding SO2 , NOx and mercury emissions 
from coal-fired power plants.  

In May 2005, the EPA issued regulations with respect to 

SO2 and NOx emissions (the Clean Air Interstate Rule) and 
mercury emissions (the Clean Air Mercury Rule). The federal 
Clean Air Interstate Rule requires generating facilities in 28 
eastern states, which include Missouri and Illinois, where our 
generating facilities are located, and the District of Columbia 
to participate in cap-and-trade programs to reduce annual 
SO2 emissions, annual NOx emissions, and ozone season 
NOx emissions. The cap-and-trade program for both annual 
and ozone season NOx emissions went into effect on 
January 1, 2009. The SO2 emissions cap-and-trade program 
is scheduled to take effect in 2010.  

54 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
Clean Air Mercury Rule. However, these rules are not 
enforceable since the U.S. Court of Appeals decision to 
vacate the federal Clean Air Mercury Rule.  

We do not believe that the court decision that vacated 
the federal Clean Air Mercury Rule will significantly affect 
pollution control obligations in Illinois in the near term. 
Under the MPS, as amended, Illinois generators may 
defer until 2015 the requirement to reduce mercury 
emissions by 90%, in exchange for accelerated installation 
of NOx and SO2 controls. This rule, when fully 
implemented, is expected to reduce mercury emissions by 
90%, NOx emissions by 50%, and SO2 emissions by 70% 
by 2015 in Illinois. To comply with the rule, Genco, CILCO 
(AERG) and EEI have begun putting into service 
equipment designed to reduce mercury emissions. Genco, 
CILCO (AERG) and EEI will also need to install additional 
pollution control equipment. Current plans include 
installing scrubbers for SO2 reduction as well as optimizing 
operations of selective catalytic reduction (SCR) systems 
for NOx reduction at certain coal-fired plants in Illinois. The 
Illinois Joint Committee on Administrative Rules approved 
a rule amendment in June 2009 that revised certain 
requirements of the MPS. As a result, Genco and CILCO 
(AERG) collectively were able to defer to subsequent 
years an estimated $300 million of environmental capital 
expenditures originally scheduled for 2009 through 2011.  
In March 2008, the EPA finalized regulations that will 

lower the ambient standard for ozone. Illinois and Missouri 
have each submitted their recommendations to the EPA 
for designating nonattainment areas. A final action by the 
EPA to designate nonattainment areas is expected in 
March 2010. State implementation plans will need to be 
submitted in 2013 unless Illinois and Missouri seek 
extensions for various requirement dates. Additional 
emission reductions may be required as a result of future 
state implementation plans. In January 2010, the EPA 
announced its plans to revise the ozone standard to a 
level lower than the level set in 2008. At this time, we are 
unable to determine the impact state implementation plans 
for such regulations would have on our results of 
operations, financial position, and liquidity.  

The table below presents estimated capital costs that 

are based on current technology to comply with state air 
quality implementation plans, the MPS, federal ambient air 
quality standards including ozone and fine particulates, 
and the federal Clean Air Visibility rule. The estimates 
shown in the table below could change depending upon 
additional federal or state requirements, the requirements 
under a MACT standard, new technology, variations in 
costs of material or labor, or alternative compliance 
strategies, among other factors. The timing of estimated 
capital costs may also be influenced by whether emission 
allowances are used to comply with any future rules, 
thereby deferring capital investment. During 2009, Ameren 
identified significant opportunities to defer or reduce 
planned capital spending, which are reflected in the 
estimates provided in the table. The capital cost estimates 
are lower than previously anticipated, in part because of 
Ameren’s ability to manage its generating fleet to minimize 

emissions while complying with emission limits and air 
permit requirements. Furthermore, previous estimates 
included assumptions about potential and developing air 
regulations, including rules that were subsequently 
vacated by the courts. These estimates include capital 
spending to comply primarily with existing and known 
regulations as of December 31, 2009.  

2010 

2015 – 2017 
 $ 

2011– 2014 
UE(a)  ............  $ 
 215 
 170 – 
 $ 
785 
650 – 
Genco ..........   
150 
120 – 
AERG ..........   
335 
275 – 
EEI  ..............   
Ameren ........  $  265   $ 1,215 – 
 $   1,485 
(a)  UE’s expenditures are expected to be recoverable in rates over time.  

 355 – 
775 – 
190 – 
280 – 
 $   150   $  1,600 – 

 $  25 – 
30 – 
65 – 
0 – 
 $   120 – 

 160   $ 
95    
5    
5    

 35   $ 
35    
75    
5    

 $   410 
915 
230 
345 
 $ 1,900 

Total 

In 2009, UE developed four-year and 20-year 

Environmental Compliance Plans to comply with all 
environmental regulations, including rules under the Clean 
Water Act, to support its environmental cost recovery 
mechanism tariff request, which was a part of its July 2009 
electric rate case filing. The plans contain a 
comprehensive assessment of environmental investments 
likely to be required of UE. See Note 2 – Rate and 
Regulatory Matters under Part II, Item 8, of this report for 
additional information on UE’s pending electric rate case.  
See Note 15 – Commitments and Contingencies 
under Part II, Item 8, of this report for a further discussion 
of environmental matters, including global climate change.  

Cash Flows from Financing Activities  

2009 versus 2008  
As a result of turmoil in the capital and credit markets 

in 2008 and 2009, we sought to improve our liquidity 
position. We replaced and extended the expiration of our 
credit facilities and sought to reduce our reliance on 
borrowings from these credit facilities, increase cash 
balances and increase the equity content of our 
capitalization. We also sought to eliminate debt at 
CILCORP as a step in simplifying our organizational 
structure.  

During 2009, Ameren and its subsidiaries issued 
$1 billion of senior debt and $634 million in common stock 
and used the proceeds to repurchase, redeem, and fund 
maturities of $631 million of long-term debt, to reduce 
short-term borrowings, and to fund capital expenditures 
and other working capital needs at UE, CIPS, Genco, 
CILCO and IP. Comparatively, during 2008, Ameren’s 
subsidiaries issued $1.9 billion of senior debt and $154 
million in common stock and used the proceeds to 
repurchase, redeem, and fund maturities of $842 million of 
long-term debt, reduce short-term borrowings, and fund 
capital expenditures and other working capital needs at 
UE, CIPS, Genco, CILCO and IP. Ameren’s capital 
issuance costs increased in 2009 compared with 2008 
because of $40 million in banking fees associated with the 
2009 Multiyear Credit Agreements and the 2009 Illinois 
Credit  

55 

  
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
  
  
  
 
 
 
  
  
  
 
 
  
Agreement and $17 million of issuance costs associated with 
Ameren’s September 2009 common stock issuance, partially 
offset by a decrease in issuance costs associated with long-
term debt. Benefiting 2009 cash from financing activities, 
compared with 2008, was a $196 million decrease in 
common stock dividends, and a $47 million increase in 
generator advances received for construction under 
generator interconnection agreements, net of repayments.  

UE’s net cash provided by financing activities decreased 

during 2009, compared with 2008, primarily because of 
$251 million of short-term borrowings repayments in 2009 
compared with net short-term borrowings of $169 million in 
2008, a $350 million decrease in the issuances of long-term 
debt, and a $184 million increase in net repayments under an 
intercompany borrowing arrangement with Ameren. Benefits 
to cash for 2009, compared with 2008, included a 
$436 million capital contribution from Ameren funded by the 
proceeds of Ameren’s September 2009 common stock 
issuance, a $378 million decrease in redemptions of long-
term debt, and an $89 million decrease in common stock 
dividend payments. The proceeds from the capital 
contribution were primarily used to reduce outstanding short-
term borrowings.  

CIPS’ net cash used in financing activities increased 
during 2009 compared with 2008. CIPS used existing cash to 
fund a net reduction in money pool borrowings, to pay 
$47 million of dividends to Ameren in 2009, and to fund a 
$3 million increase in debt issuance costs as a result of the 
banking fees associated with the 2009 Illinois Credit 
Agreement. Benefiting the 2009 period was a $66 million 
capital contribution from Ameren.  

Genco’s cash provided by financing activities increased 

during 2009 compared with 2008, primarily as a result of a 
$101 million reduction in dividends paid on common stock 
and $100 million change in short-term borrowings 
repayments. These benefits to cash during the 2009 period 
were slightly offset by a $106 million decrease in net money 
pool borrowings and a $51 million decrease in the issuance 
of long-term debt.  

CILCO had a net use of cash from financing activities in 
2009, compared with a net source of cash in 2008 primarily 
as a result of the change in CILCO’s money pool borrowings, 
$127 million increase in repayments of short-term 
borrowings, a $150 decrease in issuance of long-term debt, 
and a $6 million increase in capital issuance costs as a result 
of banking fees associated with the 2009 Illinois Credit 
Agreement. During 2009, CILCO repaid a net $98 million to 
the money pool; CILCO received $98 million of net 
borrowings in 2008. Cash from financing activities benefited 
from a $288 million increase in intercompany borrowings 
from Ameren, a $51 million capital contribution from 
CILCORP, and a $35 million decrease in redemptions of 
long-term debt and preferred stock.  

IP had a net use of cash from financing activities during 
2009, compared with a net source of cash in 2008, primarily 
as a result of a $730 million decrease in long-term debt 
issuances. During 2009, cash from financing activities 

benefited from $175 million decrease in net short-term 
borrowings repayments, a $141 million decrease in 
redemptions and maturities of long-term debt, including IP 
SPT, $155 million capital contribution received from Ameren, 
and a $40 million increase in net generator advances 
received for construction under generator interconnection 
agreements. During 2009, IP used existing cash to fund the 
maturity of $250 million of its 7.50% mortgage bonds and to 
pay banking fees associated with the 2009 Illinois Credit 
Agreement. Comparatively, during 2008, IP issued 
$730 million of senior secured notes to redeem all of IP’s 
outstanding auction-rate pollution control revenue refunding 
bonds, which had adjusted to higher interest rates as a result 
of the collapse of the auction-rate securities market, and to 
fund debt maturities and common stock dividends.  

2008 versus 2007  

During the year ended December 31, 2008, the Ameren 
Companies issued $1.9 billion of senior debt. The proceeds 
were used to repurchase, redeem, and fund maturities of 
$842 million of long-term debt, to reduce short-term 
borrowings, and to fund capital expenditures and other 
working capital needs at UE, CIPS, Genco, CILCO and IP. 
During the year ended December 31, 2007, net short-term 
borrowings of $860 million and senior debt of $674 million 
were used to fund $488 million of maturities of long-term 
debt, to fund working capital needs at Ameren subsidiaries 
and to build liquidity during a period of legislative uncertainty 
in Illinois. Additionally, CILCO redeemed the remaining 
shares of its 5.85% Class A preferred stock to complete the 
mandatory sinking fund redemption requirement, which 
resulted in a $16 million use of cash during 2008 compared 
with 2007. Benefiting 2008, compared with 2007, was a 
$63 million increase in proceeds from the issuance of 
Ameren common stock, which resulted from increased sales 
through Ameren’s 401(k) plan and DRPlus.  

UE’s net cash from financing activities increased in the 

year ended December 31, 2008, compared with the year 
ended December 31, 2007. During 2008, UE used 
$699 million in proceeds from the issuance of senior secured 
notes to redeem outstanding auction-rate environmental 
improvement revenue refunding bonds that had adjusted to 
higher interest rates as a result of the collapse of the auction-
rate securities market, and to fund the maturity of 
$148 million of UE’s 6.75% first mortgage bonds. 
Additionally, net short-term borrowings increased 
$321 million. These borrowings were primarily used to fund 
working capital needs and capital expenditures. In 2007, UE 
issued $424 million in senior secured notes and received a 
$380 million capital contribution from Ameren to fund working 
capital requirements and to reduce net short-term 
borrowings.  

CIPS had a net use of cash from financing activities in 

2008, compared with a net source of cash in 2007. This 
change occurred because CIPS used net money pool 
borrowings and existing cash to fund a net reduction in short-
term borrowings, to redeem $35 million of auction-rate 
environmental improvement revenue refunding bonds that  

56 

  
had adjusted to higher interest rates as a result of the 
collapse of the auction-rate securities market, and to fund 
the maturity of $15 million of its 5.375% senior secured 
notes during 2008. In 2007, CIPS used net short-term 
borrowings of $90 million to fund working capital needs to 
build liquidity, and to fund $40 million of common stock 
dividends.  

Genco issued $300 million of 7.00% senior unsecured 
notes during 2008, which resulted in a net source of cash 
from financing activities compared with a net use of cash 
in 2007. The proceeds from the issuance were used to 
fund capital expenditures and other working capital 
requirements, including a net reduction of $200 million of 
short-term borrowings during 2008 compared with 2007.  

CILCO’s cash provided by financing activities 
decreased in 2008 compared with 2007. This decrease 
was primarily the result of CILCO’s net repayments of 
short-term borrowings during 2008 compared with 2007. 
These repayments were funded by a net increase in 
money pool borrowings of $98 million, primarily at AERG, 
and CILCO’s issuance of $150 million of its 8.875% senior 
secured notes. Partially offsetting the decrease were 
reduced redemptions and maturities of long-term debt in 
2008. During 2008, $19 million of auction-rate 
environmental improvement revenue refunding bonds that 
had adjusted to higher interest rates as a result of the 
collapse of the auction-rate securities market were 
redeemed at CILCO. In 2007, $50 million of CILCO’s 
7.50% bonds matured.  

IP’s cash from financing activities decreased in 2008, 
compared with 2007. During 2008, IP issued $730 million 
of senior secured notes and used the proceeds to redeem 
all of IP’s outstanding auction-rate pollution control 
revenue refunding bonds that had adjusted to higher rates 
as a result of the collapse of the auction-rate securities 
market and to repay short-term borrowings. Additionally, 
during 2008, IP funded $60 million of common stock 
dividends to Ameren and had net short-term borrowings 
repayments of $175 million. Comparatively, during 2007, 
IP issued $250 million of senior secured notes, paid $61 
million of common stock dividends, and had $100 million 
of net borrowings under the 2007 credit facility. These 
borrowings were used to fund $87 million of long-term 
debt maturities and $43 million of net money pool 
repayments to build liquidity in 2007.  

Credit Facility Borrowings and Liquidity  

The liquidity needs of the Ameren Companies are 
typically supported through the use of available cash, 
short-term intercompany borrowings, or drawings under 
committed bank credit facilities. See Note 4 – Credit 
Facility Borrowings and Liquidity under Part II, Item 8, of 
this report for additional information on credit facilities, 
short-term borrowing activity, relevant interest rates, and 
borrowings under Ameren’s utility and non-state-regulated 
subsidiary money pool arrangements.  

The following table presents the committed bank credit facilities of Ameren and the Ameren Companies, and their 

availability as of December 31, 2009:  
Credit Facility 
Ameren, UE and Genco: 

Ameren, CIPS, CILCO, and IP: 

2009 Multiyear revolving(a)(b) ..............................................................................................     July 2011   
2009 Illinois revolving ........................................................................................................    June 2011   
(a)  Ameren Companies may access these credit facilities through intercompany borrowing arrangements.  
(b) 

Includes the 2009 Multiyear Credit Agreement and the Supplemental Agreement. The Supplemental Agreement will terminate in July 2010 with all 
commitments and all outstanding amounts being consolidated with those under the 2009 Multiyear Credit Agreement. At that time, the combined maximum 
amount available to all borrowers will be $1.0795 billion, and the UE and Genco Borrowing Sublimits remain the same; Ameren’s Sublimit changes to 
$1.0795 billion.  
In addition to amounts drawn on these facilities, the amount available is further reduced by standby letters of credit issued under the facilities. The amount of 
such letters of credit at December 31, 2009, was $15 million.  

(c) 

Expiration 

Amount Committed 

Amount Available 

$     1,300 

800 

$     555(c) 

700   

The combined maximum amount available to all of the 

borrowers, collectively, under the 2009 Multiyear Credit 
Agreement and the Supplemental Credit Agreement 
(collectively, the “2009 Multiyear Credit Agreements”) is 
$1.3 billion. The combined maximum amount available to 
each borrower, individually, under the 2009 Multiyear 
Credit Agreements is limited as follows: Ameren – $1.15 
billion, UE – $500 million and Genco – $150 million (such 
amounts being each borrower’s “Borrowing Sublimit”). 
CIPS, CILCO, and IP have no borrowing authority or 
liability under the 2009 Multiyear Credit Agreements. 
These credit facilities were also available for use, subject 
to applicable regulatory short-term borrowing 
authorizations, by EEI or other Ameren non-state-
regulated subsidiaries through direct short-term 
borrowings from Ameren and by most of  

Ameren’s merchant generating subsidiaries, including, but 
not limited to, Ameren Services, Resources Company, 
AERG, Marketing Company and AFS, through a non-
state- regulated subsidiary money pool agreement. 
Ameren has money pool agreements with and among its 
subsidiaries to coordinate and to provide for certain short-
term cash and working capital requirements. Separate 
money pools are maintained for utility and non-state-
regulated entities. In addition, a unilateral borrowing 
agreement among Ameren, IP, and Ameren Services 
enables IP to make short-term borrowings directly from 
Ameren. The aggregate amount of borrowings outstanding 
at any time by IP under the unilateral borrowing 
agreement and the utility money pool agreement, together 
with any outstanding external credit facility borrowings by 
IP, may not exceed $500 million, 

57 

  
  
  
 
 
 
 
  
  
  
 
  
  
  
 
 
 
  
pursuant to authorization from the ICC. IP is not currently 
borrowing under the unilateral borrowing agreement. 
Ameren Services is responsible for operation and 
administration of the money pool agreements. See Note 4 
– Credit Facility Borrowings and Liquidity under Part II, 
Item 8, of this report for a detailed explanation of the 
money pool arrangements and the unilateral borrowing 
agreement.  

The combined maximum amount available to all 
borrowers collectively under the 2009 Illinois Credit 
Agreement is $800 million, and the combined maximum 
amount available to each borrower individually, under the 
2009 Illinois Credit Agreement is limited as follows: 
Ameren – $300 million, CIPS – $135 million, CILCO – 
$150 million, and IP – $350 million.  

On January 21, 2009, Ameren entered into a 

$20 million term loan agreement due January 20, 2010, 
which was fully drawn on January 21, 2009. This term 
loan agreement was repaid at maturity in January 2010. 
See Note 4 – Credit Facility Borrowings and Liquidity 
under Part II, Item 8, of this report for additional 
information.  

In addition to committed credit facilities, a further 
source of liquidity for the Ameren Companies from time to 
time is available cash and cash equivalents. At 
December 31, 2009, Ameren, UE, CIPS, Genco, CILCO, 
and IP had $622 million, $267 million, $28 million, $6 
million, $88 million, and $190 million, respectively, of cash 
and cash equivalents.  

Long-term Debt and Equity  

The issuance of short-term debt securities by 
Ameren’s utility subsidiaries is subject to approval by 
FERC under the Federal Power Act. In March 2008, 
FERC issued an order authorizing these utility subsidiaries 
to issue such securities subject to the following limits on 
outstanding balances: UE – $1 billion, CIPS – $250 
million, and CILCO – $250 million. The authorization was 
effective as of April 1, 2008, and terminates on March 31, 
2010. UE, CIPS and CILCO have pending requests with 
FERC seeking authority to issue short-term debt securities 
subject to limits on outstanding balances of $1 billion, 
$300 million, and $250 million, respectively, for the period 
April 1, 2010, through March 31, 2012. IP has unlimited 
short-term borrowing authorization from FERC.  

Genco was authorized by FERC in its March 2008 

order to have up to $500 million of short-term debt 
outstanding at any time. Genco is seeking a renewal of 
that authorization. AERG and EEI have unlimited short-
term borrowing authorization from FERC.  

The issuance of short-term debt securities by Ameren 

is not subject to approval by any regulatory body.  

The Ameren Companies continually evaluate the 

adequacy and appropriateness of their credit 
arrangements given changing business and credit market 
conditions. When business and credit market conditions 
warrant, changes may be made to existing credit 
agreements or other short-term borrowing arrangements.  

The following table presents the issuances of common stock and the issuances, redemptions, repurchases and 
maturities of long-term debt and preferred stock (net of any issuance discounts and including any redemption premiums) 
for the years 2009, 2008, and 2007 for the Ameren Companies. For additional information related to the terms and uses of 
these issuances and the sources of funds and terms for the redemptions, see Note 5 – Long-term Debt and Equity 
Financings under Part II, Item 8, of this report.  

Issuances 
Long-term debt 
Ameren: 

UE: 

8.875% Senior unsecured notes due 2014 ..............................................  
6.40% Senior secured notes due 2017 ....................................................  
6.00% Senior secured notes due 2018 ....................................................  
6.70% Senior secured notes due 2019 ....................................................  
8.45% Senior secured notes due 2039 ....................................................  

6.30% Senior unsecured notes due 2020 ................................................  
7.00% Senior unsecured notes due 2018 ................................................  

8.875% Senior secured notes due 2013 ..................................................  

Genco: 

CILCO: 

IP: 

6.125% Senior secured notes due 2017 ..................................................  
6.25% Senior secured notes due 2018 ....................................................  
9.75% Senior secured notes due 2018 ....................................................  
Total Ameren long-term debt issuances ........................................................    
Common stock 
Ameren: 

21,850,000 shares at $25.25 ...................................................................  
DRPlus and 401(k) ..................................................................................  

Month Issued, Redeemed, 
Repurchased or Matured 

2009 

2008 

2007 

$ 

423 

$ 

 - 

$ 

 - 

- 
- 
- 
349 

249 
- 

- 

- 
250 
449 
- 

- 
300 

150 

424 
- 
- 
- 

- 
- 

- 

- 
- 
- 
$      1,021 

- 
336 
394 
$      1,879 

250 
- 
- 
$      674 

$ 

552 
82 

$ 

 - 
154 

$ 

 - 
91 

May 

June 
April 
June 
March 

November 
April 

December 

November 
April 
October 

September 
Various 

58 

  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
Month Issued, Redeemed, 
Repurchased or Matured 

2009 

$ 
634 
$          1,655 

2008 

$ 
154 
$        2,033 

2007 

$ 
$ 

91 
765 

$ 

$ 

 - 
- 

4 
- 
- 
- 
- 
- 

- 
- 

124 
253 

- 
- 

- 
- 
- 
- 
- 

- 
250 

- 

 - 
- 

4 
63 
64 
60 
43 
148 

35 
15 

- 
- 

- 
19 

112 
75 
70 
45 
35 

54 
- 

16 

$ 

    100 
250 

4 
- 
- 
- 
- 
- 

- 
- 

- 
- 

50 
- 

- 
- 
- 
- 
- 

84 
- 

1 

February 
May 

Various 
April 
May 
May 
May 
May 

April 
December 

October 
December 

January 
April 

May 
May 
May 
May 
June 

Various 
June 

July 

$ 

631 

$ 

858 

$ 

489 

In July 2008, Ameren filed a Form S-3 registration 
statement with the SEC authorizing the offering of six 
million additional shares of its common stock under 
DRPlus. Shares of common stock sold under DRPlus are, 
at Ameren’s option, newly issued shares, treasury shares, 
or shares purchased in the open market or in privately 
negotiated transactions. Ameren is currently selling newly 
issued shares of its common stock under DRPlus.  
Ameren is also selling newly issued shares of 

common stock under its 401(k) plan pursuant to an 
effective SEC Form S-8 registration statement. Under 
DRPlus and its 401(k) plan, Ameren issued 3.2 million, 
4.0 million, and 1.7 million shares of common stock in 
2009, 2008, and 2007, respectively, which were valued at 
$82 million, $154 million, and $91 million for the respective 
years.  

In September 2009, Ameren issued and sold 
21.85 million shares of its common stock at $25.25 per 
share, for proceeds of $535 million, net of $17 million of 
issuance costs. Ameren used the offering proceeds to 
make 

Total common stock issuances .....................................................................     
Total Ameren long-term debt and common stock issuances ..........................    
Redemptions, Repurchases and Maturities 
Long-term debt 
Ameren: 

2002 5.70% notes due 2007 ....................................................................  
Senior notes due 2007 ............................................................................  

UE: 

CIPS: 

CILCORP: 

CILCO: 

IP: 

City of Bowling Green capital lease (Peno Creek CT) ..............................  
2000 Series B environmental improvement bonds due 2035 ....................  
2000 Series A environmental improvement bonds due 2035 ....................  
2000 Series C environmental improvement bonds due 2035 ....................  
1991 Series environmental improvement bonds due 2020 .......................  
6.75% Series first mortgage bonds due 2008 ...........................................  

2004 Series pollution control bonds due 2025 ..........................................  
5.375% Senior secured notes due 2008 ..................................................  

8.70% Senior unsecured notes due 2009 ................................................  
9.375% Senior bonds due 2029 ...............................................................  

7.50% First mortgage bonds due 2007 ....................................................  
2004 Series pollution control bonds due 2039 ..........................................  

Series 2001 Non-AMT bonds due 2028 ...................................................  
Series 2001 AMT bonds due 2017 ...........................................................  
1997 Series A pollution control bonds due 2032 ......................................  
1997 Series B pollution control bonds due 2032 ......................................  
1997 Series C pollution control bonds due 2032 ......................................  
Note payable to IP SPT: 

5.65% Series due 2008 ......................................................................  
7.50% Series mortgage bond due 2009 .............................................  

Preferred Stock 
CILCO: 

5.85% Series .....................................................................................  
Total Ameren long-term debt and preferred stock redemptions, repurchases 
and maturities .........................................................................................    

In November 2008, Ameren, CIPS, Genco, CILCO 

and IP, filed a Form S-3 shelf registration statement 
registering the issuance of an indeterminate amount of 
certain types of securities, which expires in November 
2011. In June 2008, UE filed a Form S-3 shelf registration 
statement registering the issuance of an indeterminate 
amount of certain types of securities, which expires in 
June 2011.  

The following table presents information with respect 

to the Form S-3 shelf registration statements filed and 
effective for certain Ameren Companies as of 
December 31, 2009:  

Effective 
Date 

Ameren ...............................................     November 2008  
UE  .....................................................    
June 2008  
CIPS ...................................................     November 2008  
Genco .................................................     November 2008  
CILCO ................................................     November 2008  
IP   .....................................................     November 2008  

Authorized 
Amount 
Not Limited 
Not Limited 
Not Limited 
Not Limited 
Not Limited 
Not Limited 

59 

 
 
 
 
 
  
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
  
 
  
investments in its rate-regulated utility subsidiaries in the 
form of capital contributions as follows: UE – $436 million, 
CIPS – $13 million, CILCO – $25 million, and IP – 
$61 million.  

Ameren, UE, CIPS, Genco, CILCO and IP may sell 

securities registered under their effective registration 
statements if market conditions and capital requirements 
warrant such a sale. Any offer and sale will be made only 
by means of a prospectus that meets the requirements of 
the Securities Act of 1933 and the rules and regulations 
thereunder.  

Indebtedness Provisions and Other Covenants  

See Note 4 – Credit Facility Borrowings and Liquidity 

and Note 5 – Long-term Debt and Equity Financings under 
Part II, Item 8, of this report for a discussion of covenants 
and provisions (and applicable cross-default provisions) 
contained in our bank credit and term loan facilities and in 
certain of the Ameren Companies’ indenture agreements 
and articles of incorporation.  

At December 31, 2009, the Ameren Companies were 

in compliance with their credit facility, indenture, and 
articles of incorporation provisions and covenants.  

We consider access to short-term and long-term 
capital markets a significant source of funding for capital 
requirements not satisfied by our operating cash flows. 
Inability to raise capital on favorable terms, particularly 
during times of uncertainty in the capital markets, could 
negatively affect our ability to maintain and expand our 
businesses. After assessing our current operating 
performance, liquidity, and credit ratings (see Credit 
Ratings below), we believe that we will continue to have 
access to the capital markets. However, events beyond 
our control may create uncertainty in the capital markets 
or make access to the capital markets uncertain or limited. 
Such events could increase our cost of capital and 
adversely affect our ability to access the capital markets.  

Dividends  

Ameren paid to its shareholders common stock 

dividends totaling $338 million, or $1.54 per share, in 
2009, $534 million, or $2.54 per share, in 2008, and $527 
million, or $2.54 per share, in 2007. This resulted in a 

payout rate based on net income of 55% in 2009, 88% in 
2008, and 85% in 2007. Dividends paid to common 
shareholders in relation to net cash provided by operating 
activities for the same periods were 17% in 2009, 35% in 
2008 and 48% in 2007.  

The amount and timing of dividends payable on 
Ameren’s common stock are within the sole discretion of 
Ameren’s board of directors. The board of directors has 
not set specific targets or payout parameters when 
declaring common stock dividends. However, as it has 
done in the past, the board of directors is expected to 
consider various issues, including Ameren’s overall payout 
ratio, payout ratios of our peers, projected cash flow and 
potential future cash flow requirements, historical earnings 
and cash flow, projected earnings, impacts of regulatory 
orders or legislation, and other key business 
considerations. On February 12, 2010, the board of 
directors of Ameren declared a quarterly dividend on 
Ameren’s common stock of 38.5 cents per share, payable 
on March 31, 2010, to shareholders of record on 
March 10, 2010.  

Certain of our financial agreements and corporate 

organizational documents contain covenants and 
conditions that, among other things, restrict the Ameren 
Companies’ payment of dividends in certain 
circumstances. At December 31, 2009, none of these 
circumstances existed at the Ameren Companies and, as 
a result, they were allowed to pay dividends.  

UE would be restricted as to dividend payments on its 

common and preferred stock if it were to extend or defer 
interest payments on its subordinated debentures. CIPS’ 
articles of incorporation and mortgage indentures require 
its dividend payments on common stock to be based on 
ratios of common stock to total capitalization and other 
provisions related to certain operating expenses and 
accumulations of earned surplus. Genco’s indenture 
includes restrictions that prohibit it from making any 
dividend payments on common stock if debt service 
coverage ratios are below a defined threshold. CILCO has 
restrictions in its articles of incorporation on dividend 
payments on common stock relative to the ratio of its 
balance of retained earnings to the annual dividend 
requirement on its preferred stock. 

60 

 
  
UE, CIPS, Genco, CILCO and IP as well as certain 
other nonregistrant Ameren subsidiaries are subject to 
Section 305(a) of the Federal Power Act, which makes it 
unlawful for any officer or director of a public utility, as 
defined in the Federal Power Act, to participate in the 
making or paying of any dividend from any funds “properly 
included in capital account.” The meaning of this limitation 
has never been clarified under the Federal Power Act or 
FERC regulations; however, FERC has consistently 
interpreted the provision to allow dividends to be paid as 
long as (1) the source of the dividends is clearly disclosed, 
(2) the dividends are not excessive and (3) there is no 
self-dealing on the part of corporate officials. At a 
minimum, Ameren believes that dividends can be paid by 
its subsidiaries that are public utilities from net income and 
retained earnings. In addition, under Illinois law, CIPS, 
CILCO and IP may not pay any dividend on their 
respective stock, unless, among other things, their 
respective earnings and earned surplus are sufficient to 
declare and pay a dividend after provision is made for 
reasonable and proper reserves, or unless CIPS, CILCO 
or IP has specific authorization from the ICC.  

Contractual Obligations  

The following table presents common stock dividends 
paid by Ameren Corporation and by Ameren’s subsidiaries 
to their respective parents.  

UE  
CIPS ...............................................  
Genco .............................................  
CILCO ............................................  
IP   .................................................  
Nonregistrants ................................  
Dividends paid by Ameren ..............  

2009 
$     175   
47   
-   
20   
31   
65   
$  338   

2008 
$     264   
-   
101   
-   
60   
109   
$  534   

2007 
$     267 
40 
113 
- 
61 
46 
$  527 

Certain of the Ameren Companies have issued 
preferred stock on which they are obligated to make 
preferred dividend payments. Each company’s board of 
directors considers the declaration of the preferred stock 
dividends to shareholders of record on a certain date, 
stating the date on which the dividend is payable and the 
amount to be paid. See Note 10 – Preferred Stock under 
Part II, Item 8, of this report for further detail concerning 
the preferred stock issuances.  

The following table presents our contractual obligations as of December 31, 2009. See Note 11 – Retirement Benefits 

under Part II, Item 8, of this report for information regarding expected minimum funding levels for our pension plans. 
These expected pension funding amounts are not included in the table below. In addition, routine short-term purchase 
order commitments are not included.  

Ameren:(a)  
Long-term debt and capital lease obligations(b)(c) ...........   
Short-term debt and credit facility borrowings ................  
Interest payments(d) ......................................................  
Operating leases(e) ........................................................  
2007 Illinois Electric Settlement Agreement ...................  
Other obligations(f) ........................................................  
Total cash contractual obligations .................................  
UE: 
Long-term debt and capital lease obligations(c) ..............  
Interest payments(d)  ......................................................  
Operating leases(e) ........................................................  
Other obligations(f) ........................................................  
Total cash contractual obligations .................................  
CIPS: 
Long-term debt(c) ...........................................................  
Interest payments(d) ......................................................  
Operating leases(e) ........................................................  
2007 Illinois Electric Settlement Agreement ...................  
Other obligations(f) ........................................................  
Total cash contractual obligations .................................  
Genco: 
Long-term debt(c) ...........................................................  
Intercompany note payable – CIPS ...............................  
Interest payments .........................................................  
Operating leases(e) ........................................................  
2007 Illinois Electric Settlement Agreement ...................  
Other obligations(f) ........................................................  
Total cash contractual obligations .................................  

Total 

Less than 1 Year 

1 - 3 Years 

3 - 5 Years 

After 5 Years 

$ 

7,333  
850  
5,276  
351  
3  
7,048  
$     20,861  

$ 

4,030  
3,220  
157  
3,812  
$  11,219  

$ 

$ 

$ 

$ 

422  
286  
2  
(g ) 
346  
1,056  

1,025  
45  
679  
133  
1  
648  
2,531  

$ 

204  
20  
467  
37  
3  
1,714  
$       2,445  

$ 

333   
830   
887   
59   
-   
2,558   
$       4,667  

$ 

940   
-   
812   
52   
-   
996   
$       2,800  

4  
239  
14  
729  
986  

-  
27  
-  
(g ) 
93  
120  

200  
45  
57  
9  
1  
233  
545  

$ 

$ 

$ 

$ 

$ 

$ 

183   
474   
25   
1,029   
1,711   

150   
39   
1   
-   
142   
332   

-   
-   
86   
17   
-   
374   
477   

$ 

$ 

$ 

$ 

$ 

$ 

314   
443   
25   
614   
1,396   

51   
32   
1   
-   
89   
173   

-   
-   
86   
17   
-   
38   
141   

$ 

$ 

$ 

$ 

$ 

$ 

61 

$ 

5,856 
- 
3,110 
203 
- 
1,780 
$     10,949 

$ 

$ 

$ 

$ 

$ 

$ 

3,529 
2,064 
93 
1,440 
7,126 

221 
188 
- 
- 
22 
431 

825 
- 
450 
90 
- 
3 
1,368 

  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CILCO: 
Long-term debt .............................................................  
Intercompany note payable – Ameren ...........................  
Interest payments .........................................................  
Operating leases(e) ........................................................  
2007 Illinois Electric Settlement Agreement ...................  
Other obligations(f) ........................................................  
Total cash contractual obligations .................................  
IP: 
Long-term debt(b)(c) ........................................................  
Interest payments .........................................................  
Operating leases(e) ........................................................  
2007 Illinois Electric Settlement Agreement ...................  
Other obligations(f) ........................................................  
Total cash contractual obligations .................................  

Total 

$ 

279  
288  
173  
16  
1  
  1,043  
$  1,800  

$  1,150  
752  
6  
1  
733  
$  2,642  

Less than 1 Year 

1 - 3 Years 

3 - 5 Years 

After 5 Years 

$ 

- 
288 
21 
1 
1 
263 
$  574 

$ 

- 
85 
2 
1 
226 
$  314 

$ 

1 
- 
42 
2 
- 
428 
$  473 

$ 

- 
170 
3 
- 
297 
$  470 

$  150 
- 
29 
2 
- 
  161 
$  342 

$ 
- 
  170 
1 
- 
87 
$  258 

$  128 
- 
81 
11 
- 
191 
$  411 

$  1,150 
327 
- 
- 
123 
$  1,600 

Includes amounts for registrant and nonregistrant Ameren subsidiaries and intercompany eliminations.  

(a) 
(b)  Excludes fair-market value adjustments of long-term debt of $6 million for IP.  
(c)  Excludes unamortized discount of $2 million at Ameren, $8 million at UE, $1 million at CIPS, $2 million at Genco, and $9 million at IP.  
(d)  The weighted average variable-rate debt has been calculated using the interest rate as of December 31, 2009.  
(e)  Amounts related to certain real estate leases and railroad licenses have indefinite payment periods. Ameren’s $2 million annual obligation for these items is 
included in the Less than 1 Year, 1 – 3 Years, and 3 – 5 Years columns. Amounts for After 5 Years are not included in the total amount because that period 
is indefinite.  
(f)  See Other Obligations within Note 15 – Commitments and Contingencies under Part II, Item 8 of this report, for discussion of items represented herein.  
(g)  Less than $1 million.  

As of December 31, 2009, the amounts of 

unrecognized tax benefits were $135 million, $88 million, 
$- million, $28 million, $15 million and $- million for 
Ameren, UE, CIPS, Genco, CILCO and IP, respectively. It 
is reasonably possible to expect that the settlement of an 
unrecognized tax benefit will result in an underpayment or 
overpayment of tax and related interest. However, there is 
a high degree of uncertainty with respect to the timing of 
cash payments or receipts associated with unrecognized 
tax benefits. The amount and timing of certain payments 
or receipts is not reliably estimable or determinable at this 
time. See Note 13 – Income Taxes under Part II, Item 8, of 
this report for information regarding the Ameren 
Companies’ unrecognized tax benefits and related 
liabilities for interest expense.  

Off-Balance-Sheet Arrangements  

At December 31, 2009, none of the Ameren 
Companies had any off-balance-sheet financing 
arrangements other than operating leases entered into in 
the ordinary course of business. None of the Ameren 
Companies expect to engage in any significant off-
balance-sheet financing arrangements in the near future.  

Credit Ratings  

The following table presents the principal credit 
ratings of the Ameren Companies by Moody’s, S&P, and 
Fitch effective on the date of this report:  

Ameren: 
Issuer/corporate credit rating .........   
Senior unsecured debt ..................   
UE: 
Issuer/corporate credit rating .........   
Secured debt ................................   
CIPS: 
Issuer/corporate credit rating .........   
Secured debt ................................   
Senior unsecured debt ..................   
Genco: 
Issuer/corporate credit rating .........   
Senior unsecured debt ..................   
CILCO: 
Issuer/corporate credit rating .........   
Secured debt ................................   
IP: 
Issuer/corporate credit rating .........   
Secured debt ................................   

Moody’s Ratings Actions  

Moody’s 

S&P 

Fitch 

Baa3 
Baa3 

Baa2 
A3 

Baa3 
Baa1 
Baa3 

- 
Baa3 

Baa3 
Baa1 

Baa3 
Baa1 

    BBB- 
BB+ 

    BBB- 
     BBB  

    BBB- 
    BBB+ 
    BBB- 

    BBB- 
    BBB- 

    BBB- 
    BBB+ 

    BBB- 
    BBB  

BBB+ 
BBB+ 

BBB+ 
A  

BBB - 
BBB+ 
BBB  

BBB+ 
BBB+ 

BBB  
A - 

BBB - 
BBB+ 

On January 29, 2009, Moody’s affirmed the ratings of 
CIPS, CILCO and IP and changed their rating outlooks to 
stable from positive. According to Moody’s, the change in 
the rating outlooks of these three companies was based 
on the near-term expiration of the 2007 and 2006 $500 
million 

62 

 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
  
  
  
 
   
 
  
  
  
 
 
  
  
  
 
 
 
  
  
  
 
 
  
  
  
 
 
  
  
  
 
 
 
  
S&P Ratings Actions  

On February 25, 2009, S&P stated that it viewed the 
reduction in Ameren’s dividend as credit supportive. S&P did 
not make any changes in Ameren’s or its subsidiaries’ credit 
ratings or outlooks as a result of this action. S&P raised the 
business profile of UE to “excellent” from “strong” to reflect 
the electric rate order issued by the MoPSC in January 2009, 
which S&P viewed as constructive. S&P lowered the 
business profile of CILCO to “satisfactory” from “strong.”  

On February 25, 2010, S&P assigned improved business 
risk profiles to CIPS and IP of “excellent” from “strong” and to 
CILCO of “strong” from “satisfactory.”  

Fitch Ratings Actions  

On February 17, 2009, Fitch stated that the reduction in 

Ameren’s common stock dividend and other cost cutting 
measures would be favorable to bondholders and credit 
quality. Fitch did not make any changes in Ameren’s or its 
subsidiaries’ ratings or outlooks as a result of this action.  

On March 9, 2009, Fitch lowered the credit ratings of UE 

by one notch as follows: issuer rating to BBB+, senior 
secured debt to A, subordinated debt to BBB+, and preferred 
stock to BBB+. The rating outlook was changed to stable. 
Fitch stated that these downgrades were made because of 
deteriorating financial measures over the past several years 
and the expectation that they will not improve materially 
without further rate support. They noted the financial 
deterioration was primarily due to increasing fuel and 
operating costs and a large capital expenditure program.  

On July 31, 2009, Fitch affirmed the credit rating of 
Genco and changed its rating outlook to negative from stable. 
Additionally, Fitch affirmed the credit ratings of Ameren with a 
stable outlook. According to Fitch, the change in the credit 
rating outlook of Genco was based on the unfavorable 
outlook for wholesale energy prices and the sensitivity of the 
company’s largely coal-fired generating fleet to greenhouse 
gas and other environmental regulations. According to Fitch, 
the affirmation of Ameren’s credit ratings and stable outlook 
reflected the significant earnings and cash flow contribution 
derived from regulated utilities, the beneficial impact of recent 
rate increases in Illinois and Missouri, the savings generated 
by the February 2009 dividend reduction, and steps taken to 
maintain liquidity, including the renewal of bank credit 
facilities.  

On January 22, 2010, Fitch announced new guidelines 
that affect its ratings on deferrable coupon hybrid securities 
and preferred stock for utility issuers. Under these new 
guidelines, Fitch will rate these securities two notches below 
the issuer’s senior unsecured debt ratings. The prior 
guidelines rated these securities one notch below. The 
ratings for UE, CIPS, CILCO and IP’s preferred stock, and for 
UE’s

credit facilities in January 2010 and related liquidity concerns. 
Moody’s also on January 29, 2009, affirmed the ratings of 
Ameren and UE with a stable outlook based on the January 
2009 MoPSC electric rate order approving a rate increase 
and a FAC for UE.  

On February 16, 2009, Moody’s affirmed the ratings of 

Ameren, UE, CIPS, Genco, CILCO, and IP with a stable 
outlook. The affirmation reflected Moody’s view that 
Ameren’s announcement to reduce its common dividend by 
39% was a conservative, prudent, and credit positive action 
that would conserve cash and support financial coverage 
metrics. Moody’s stated that the more conservative dividend 
payout should also help facilitate the renewal of Ameren’s 
credit facilities that expired in 2010. They stated the dividend 
reduction should continue to reduce reliance on the credit 
facilities going forward and would likely be viewed favorably 
by lenders considering renewing or entering into new facilities 
with Ameren and its subsidiaries, which was important 
considering constrained credit market conditions at that time. 
According to Moody’s, the stable outlook on Ameren, UE, 
CIPS, Genco, CILCO, and IP reflected constructive rate case 
outcomes at UE, CIPS, CILCO and IP, including the approval 
of a FAC at UE; the improving regulatory environments for 
investor-owned utilities in Illinois and Missouri at that time; 
and Moody’s expectation that financial and cash flow 
coverage metrics should remain adequate to maintain current 
rating levels. In addition, Moody’s noted that the dividend 
reduction was supportive of the stable ratings outlooks and 
provided Ameren and its subsidiaries additional cushion at 
the rating levels.  

On July 1, 2009, Moody’s stated that the successful 

execution of new two-year bank credit facilities was 
supportive of the credit quality of Ameren and its utility 
subsidiaries. However, Moody’s did not make any changes in 
Ameren’s or its subsidiaries’ ratings or outlooks as a result of 
this action.  

On August 3, 2009, Moody’s upgraded the majority of 
senior secured debt ratings of investment-grade regulated 
utilities by one notch. Senior secured debt ratings at UE were 
upgraded from Baa1 to A3 and at CIPS and IP from Baa3 to 
Baa2. Moody’s stated the rating action widened the notching 
between most senior secured debt ratings and senior 
unsecured debt ratings of investment-grade regulated utilities 
to two notches from one previously. Moody’s noted the wider 
notching was based on its analysis of the history of regulated 
utility defaults, which indicated that regulated utilities have 
defaulted at a lower rate and experienced lower loss given 
default rates than nonfinancial, nonutility corporate issuers.  

On August 13, 2009, Moody’s upgraded the ratings of 
CIPS, CILCO and IP. Issuer/corporate credit ratings at CIPS, 
CILCO and IP were upgraded from Ba1 to Baa3. Moody’s 
also upgraded the senior secured debt ratings at CIPS, 
CILCO and IP from Baa2 to Baa1. Moody’s cited the 
execution of new bank credit facilities and an improved 
political and regulatory environment in Illinois as the basis for 
the return to investment grade status of the issuer/corporate 
ratings. Moody’s also affirmed the ratings of Ameren, UE and 
Genco and assigned a stable outlook for Ameren and all of 
its rated subsidiaries.  

63 

  
  
7.69% subordinated deferrable interest debentures, were 
affected by this industry-wide methodology change.  

these events have several implications for our industry as a 
whole, including Ameren. They include the following:  

Collateral Postings  

Any adverse change in the Ameren Companies’ credit 
ratings may reduce access to capital and trigger additional 
collateral postings and prepayments. Such changes may also 
increase the cost of borrowing and fuel, power, and gas 
supply, among other things, resulting in a negative impact on 
earnings. Collateral postings and prepayments made with 
external parties including postings related to exchange-
traded contracts at December 31, 2009, were $106 million, 
$25 million, $3 million, $1 million, and $14 million at Ameren, 
UE, CIPS, CILCO and IP, respectively. The amount of 
collateral external counterparties posted with Ameren was 
$12 million at December 31, 2009. Sub-investment-grade 
issuer or senior unsecured debt ratings (lower than “BBB-” or 
“Baa3”) at December 31, 2009, could have resulted in 
Ameren, UE, CIPS, Genco, CILCO or IP being required to 
post additional collateral or other assurances for certain trade 
obligations amounting to $368 million, $129 million, 
$29 million, $48 million, $44 million, and $52 million, 
respectively.  

Changes in commodity prices could trigger additional 
collateral postings and prepayments at current credit ratings. 
If market prices were 15% higher than December 31, 2009, 
levels in the next twelve months and 20% higher thereafter 
through the end of the term of the commodity contracts, then 
Ameren, UE, CIPS, Genco, CILCO or IP could be required to 
post additional collateral or other assurances for certain trade 
obligations up to approximately $171 million, $82 million, $-
 million, $- million, $9 million, and $- million, respectively. If 
market prices were 15% lower than December 31, 2009, 
levels in the next twelve months and 20% lower thereafter 
through the end of the term of the commodity contracts, then 
Ameren, UE, CIPS, Genco, CILCO or IP could be required to 
post additional collateral or other assurances for certain trade 
obligations up to approximately $329 million, $171 million, 
$14 million, $- million, $53 million, and $50 million, 
respectively.  

The cost of borrowing under our credit facilities can also 

increase or decrease depending upon the credit ratings of the 
borrower. A credit rating is not a recommendation to buy, sell, 
or hold securities. It should be evaluated independently of 
any other rating. Ratings are subject to revision or withdrawal 
at any time by the rating organization.  

OUTLOOK  

Below are some key trends that may affect the Ameren 

Companies’ financial condition, results of operations, or 
liquidity in 2010 and beyond.  

Economy and Capital and Credit Markets  

In 2008 and 2009, global capital and credit markets 
experienced extreme volatility. While these markets improved 
during 2009, the availability and cost of capital and economic 
activity continue to be significantly affected. We believe that 

  Access to Capital Markets and Cost of Capital – The 
extreme disruption in the capital markets limited the 
ability of many companies, including the Ameren 
Companies, to freely access the capital and credit 
markets to support their operations and to refinance 
debt. Ameren and its subsidiaries continued to have 
access to the capital markets, as evidenced by 
Ameren’s, UE’s, Genco’s, CILCO’s and IP’s sale of debt 
securities in late 2008 and 2009, as well as Ameren’s 
common stock offering in September 2009. This access 
has been at commercially acceptable but higher rates in 
the case of the issuance of certain debt securities.  
  Credit Facilities – On June 30, 2009, Ameren and certain 

of its subsidiaries successfully reached definitive 
multiyear credit facility agreements. These facilities 
cumulatively provide $2.1 billion of credit through July 14, 
2010, reducing to $1.8795 billion through June 30, 2011, 
and to $1.0795 billion through July 14, 2011. The costs 
of these credit facilities are significantly higher than the 
facilities they replaced. The costs to enter into the 
multiyear credit facility agreements were $40 million in 
the aggregate (UE – $11 million, CIPS – $3 million, 
Genco – $4 million, CILCORP – $14 million, CILCO – 
$7 million, and IP – $7 million). The costs will be 
amortized over the term of the facilities. In addition, 
borrowing rates under the facilities increased 
significantly, including, in the case of Ameren, from 
LIBOR plus 0.5%, under the prior credit facilities, to 
LIBOR plus 2.75%. Ameren intends to replace or extend 
its credit facility agreements during 2010.  

  Economic Conditions – Weak economic conditions have 
resulted in reduced power prices, lower customer sales 
growth, or sales contraction, particularly with respect to 
industrial sales, and higher financing costs, among other 
things. Weak economic conditions also expose the 
Ameren Companies to greater risk of default by 
counterparties, potentially higher bad debt expenses, 
and the risk of impairment of goodwill and long-lived 
assets, among other things. Based on the results of the 
annual goodwill impairment test completed as of 
October 31, 2009, the estimated fair value of Ameren’s 
Merchant Generation reporting unit exceeded its carrying 
value by a nominal amount. The failure in the future of 
this reporting unit, or any reporting unit, to achieve 
forecasted operating results and cash flows or a further 
decline of observable industry market multiples may 
reduce its estimated fair value below its carrying value 
and would likely result in the recognition of a goodwill 
impairment charge. Although we are unable to predict 
when the U.S. economy will fully recover from the 
economic downturn, we currently expect economic 
conditions to improve in 2010. We are unable to predict 
the ultimate impact of the weak economy on our results 
of operations, financial position, or liquidity.  
Investment Returns – The disruption in the capital 
markets, coupled with weak global economic conditions, 
adversely affected financial markets. As a result, we  

 

64 

  
experienced lower-than-expected investment returns in 
2008 in our pension and postretirement benefit plans. 
During 2009, the actual return on investment of the 
pension plan assets was equal to the expected 
investment return while the actual return on investment 
of postretirement benefit assets exceeded the expected 
return. Lower returns increase our future pension and 
postretirement expenses and pension funding levels. Our 
future expenses and funding levels will also be affected 
by future investment returns and future discount rate 
levels.  

  Operating and Capital Expenditures – The Ameren 

Companies will continue to make significant levels of 
investments and incur expenditures for their electric and 
natural gas utility infrastructure in order to improve 
overall system reliability, comply with environmental 
regulations, and improve plant performance. However, in 
response to the significant level of disruption and 
uncertainties in the capital and credit markets and weak 
economic conditions that reduced power prices and to 
help our customers with their future energy costs, we 
reduced our planned capital expenditures for 2010 
through 2013 by approximately $2 billion, as compared 
to earlier plans. Ameren also took steps to control 
operations and maintenance expenditures. Ameren is 
managing power plant outages and labor costs, among 
other things. Any expenditure control initiatives will be 
balanced against a continued long-term commitment to 
invest in our electric and natural gas infrastructure to 
provide safe, reliable electric and natural gas delivery 
services to our customers; to meet federal and state 
environmental, reliability, and other regulations; and the 
need to maintain a solid overall liquidity and credit ratings 
profile to meet our operating, capital, and financing 
needs under challenging capital and credit market 
conditions.  
Liquidity – At December 31, 2009, Ameren, on a 
consolidated basis, had available liquidity, in the form of 
cash on hand and amounts available under its existing 
credit facilities, of approximately $1.9 billion, which was 
$0.6 billion more than it had at the end of 2008.  

 

We believe that our liquidity is adequate given our 
expected operating cash flows, capital expenditures, and 
related financing plans (including accessing our existing 
credit facilities). However, there can be no assurance that 
significant changes in economic conditions, further 
disruptions in the capital and credit markets, or other 
unforeseen events will not materially affect our ability to 
execute our expected operating, capital or financing plans.  

 

Current Capital Expenditure Plans  

  Between 2010 and 2017, Ameren expects to invest up to 
$1.9 billion, in the aggregate, to retrofit its coal-fired 
power plants with pollution control equipment in 
compliance with emissions-related environmental laws 
and regulations. Any pollution control investments will 
result in decreased plant availability during construction 
and significantly higher ongoing operating expenses.  

Approximately 20% of this investment is expected to be 
in our Missouri Regulated operations, and it is therefore 
expected to be recoverable from ratepayers, subject to 
prudency reviews. Regulatory lag may materially impact 
the timing of such recovery and, therefore, our cash 
flows and related financing needs. The recoverability of 
amounts expended in Merchant Generation operations 
will depend on whether market prices for power adjust as 
a result of market conditions reflecting increased 
environmental costs for coal-fired generators.  

  Future federal and state legislation or regulations that 
mandate limits on emissions would result in significant 
increases in capital expenditures and operating costs. 
Excessive costs to comply with future legislation or 
regulations might force Ameren and other similarly 
situated electric power generators to close some coal-
fired facilities. Investments to control emissions at 
Ameren’s coal-fired power plants to comply with future 
legislation or regulations would significantly increase 
future capital expenditures and operations and 
maintenance expenses, which if excessive could result in 
the closures of coal-fired power plants, impairment of 
assets, or otherwise materially adversely affect Ameren’s 
results of operations, financial position, and liquidity.  
  UE continues to evaluate its longer-term needs for new 

baseload and peaking electric generation capacity. UE’s 
integrated resource plan filed with the MoPSC in 
February 2008 included the expectation that new 
baseload generation capacity would be required in the 
2018 to 2020 time frame. Due to the significant time 
required to plan, acquire permits for, and build a 
baseload power plant, UE continues to study future plant 
alternatives, including energy efficiency programs that 
could help defer new plant construction. UE introduced 
multiple energy efficiency programs in 2009. The goal of 
these and future UE energy efficiency programs is to 
reduce usage by 540 megawatts by 2025, which is the 
equivalent of a medium-size coal-fired power plant. UE 
will consider all available and feasible generation options 
to meet future customer requirements as part of an 
integrated resource plan that UE will file with the MoPSC 
in 2011.  
In July 2008, UE filed an application with the NRC for a 
combined construction and operating license for a new 
1,600-megawatt nuclear unit at UE’s existing Callaway 
County, Missouri, nuclear plant site. In June 2009, UE 
requested the NRC suspend review of the COLA and all 
activities related to the COLA. As of December 31, 2009, 
UE had capitalized approximately $69 million as 
construction work in progress related to the COLA. The 
incurred costs will remain capitalized while management 
assesses all options to maximize the value of its 
investment in this project. If all efforts are permanently 
abandoned with respect to the future construction of a 
new nuclear unit or management concludes it is probable 
the costs incurred will be disallowed in rates, it is 
possible that a charge to earnings could be recognized in 
a future period.  

  UE intends to submit a license extension application with 
the NRC to extend its existing Callaway nuclear plant’s

65 

  
operating license by 20 years so that the operating 
license will expire in 2044. UE cannot predict whether or 
when the NRC will approve the license extension.  
  Over the next few years, we expect to make significant 

 

investments in our electric and natural gas infrastructure 
and to incur increased operations and maintenance 
expenses to improve overall system reliability. We are 
projecting higher labor and material costs for these 
capital expenditures. We expect these costs or 
investments at our rate-regulated businesses to be 
ultimately recovered in rates, subject to prudency 
reviews by regulators, although rate case outcomes and 
regulatory lag could materially impact the timing of such 
recovery and, therefore, our cash flows, related financing 
needs and the timing in which we are able to proceed 
with these projects.  

  Ameren is evaluating opportunities to expand its 

transmission assets. New transmission projects have the 
potential to reduce congestion, improve reliability, and 
facilitate movement of renewable energy, typically 
generated in remote areas, to population centers where 
demand is at its highest.  
Increased investments for environmental compliance, 
reliability improvement, and new baseload capacity will 
result in higher depreciation and financing costs.  

 

Revenues  

  The earnings of UE, CIPS, CILCO and IP are largely 

 

 

determined by the regulation of their rates by state 
agencies. Rising costs, including labor, material, 
depreciation and financing costs, coupled with increased 
capital and operations and maintenance expenditures 
targeted at enhanced distribution system reliability and 
environmental compliance, are expected. Ameren, UE, 
CIPS, CILCO and IP anticipate regulatory lag until their 
requests to increase rates to recover such costs on a 
timely basis are granted by state regulators. Ameren, 
UE, CIPS, CILCO and IP expect to file rate cases 
frequently. UE has agreed not to file a natural gas 
delivery rate case before March 15, 2010.  
In current and future rate cases, UE, CIPS, CILCO and 
IP will continue to seek cost recovery and tracking 
mechanisms from their state regulators to reduce 
regulatory lag.  
In July 2009, a new law became effective in Illinois that 
allows electric and natural gas utilities to recover through 
a rate adjustment the difference between their actual bad 
debt expense and the bad debt expense included in 
their base rates. In February 2010, the ICC approved 
the Ameren Illinois Utilities’ electric and natural gas rate 
adjustment tariffs to recover bad debt expense not 
recovered in rates. The tariffs provide utilities the ability 
to adjust their base rates annually through a rate 
adjustment mechanism that applies to 2008 and 
subsequent years. The Ameren Illinois Utilities were 
required to make a one-time donation of $10 million 
(CIPS – $2 million, CILCO – $2 million, and IP – 
$6 million) for customer assistance programs, as 
required by the legislation. The amount of the required 
one-time donation and the impact of the recovery of  
2008 and 2009 bad debt expenses were reflected in 
2009 earnings.  

66 

In June 2009, CIPS, CILCO and IP filed requests with 
the ICC to increase their annual revenues for electric and 
natural gas delivery services. The currently pending 
requests, as amended, seek to increase annual 
revenues from electric delivery service by $115 million in 
the aggregate (CIPS – $38 million, CILCO – $17 million, 
and IP – $60 million). The electric rate increase requests 
are based on an 11.3% to 11.7% return on equity, a 
capital structure composed of 44% to 49% equity, an 
aggregate rate base for the Ameren Illinois Utilities of 
$2.3 billion, and a test year ended December 31, 2008, 
with certain known and measurable adjustments through 
May 2010. The currently pending requests, as amended, 
seek to increase annual revenues for natural gas delivery 
service by $15 million in the aggregate (CIPS – $6 
million, CILCO – $2 million, and IP – $7 million). The 
natural gas rate increase requests are based on a 10.8% 
to 11.2% return on equity, a capital structure composed 
of 44% to 49% equity, an aggregate rate base for the 
Ameren Illinois Utilities of $1.0 billion, and a test year 
ended December 31, 2008, with certain known and 
measurable adjustments through May 2010. The ICC 
staff has recommended, as amended, a net increase in 
revenues for electric delivery service for the Ameren 
Illinois Utilities of $57 million in the aggregate (CIPS – 
$21 million increase, CILCO – $5 million increase, and IP 
– $31 million increase) and a net decrease in revenues 
for natural gas delivery service of $11 million in the 
aggregate (CILCO – $6 million decrease, and IP – 
$5 million decrease). The ICC proceedings relating to the 
proposed electric and natural gas delivery service rate 
changes will take place over a period of up to 11 months, 
and decisions by the ICC in such proceedings are 
required by May 2010. 

  UE filed a request with the MoPSC in July 2009 to 
increase its annual revenues for electric service by 
$402 million. Included in this increase request was 
approximately $227 million of anticipated increases in 
normalized net fuel costs in excess of the net fuel costs 
included in base rates previously authorized by the 
MoPSC in its January 2009 electric rate order, which, 
absent initiation of this general rate proceeding, would 
have been eligible for recovery through UE’s existing 
FAC. The initial electric rate increase was based on an 
11.5% return on equity, a capital structure composed of 
47.4% equity, a rate base for UE of $6.0 billion, and a 
test year ended March 31, 2009, with certain pro forma 
adjustments through the anticipated true-up date of 
January 31, 2010. In February 2010, UE filed rebuttal 
testimony relating to certain positions taken by 
interveners in the rate case and modified its 
recommended return on equity to 10.8%. The MoPSC 
staff has recommended an increase to UE’s annual 
revenues of between $218 million to $251 million. 
Included in this recommendation was approximately 
$214 million of increases in normalized net fuel costs. 
The MoPSC proceeding relating to the proposed electric 
service rate changes will take place over a period of  
up to

  
  
11 months, and a decision by the MoPSC in such 
proceeding is required by the end of June 2010.  
  As part of its filing, UE also requested that the MoPSC 
approve the implementation of an environmental cost 
recovery mechanism and a storm restoration cost tracker 
as well as the continued use of the FAC and the 
vegetation management and infrastructural inspection 
cost tracking mechanism that the MoPSC previously 
authorized in its January 2009 electric rate order. The 
environmental cost recovery mechanism, if approved, 
would allow UE to adjust electric rates twice each year 
outside of general rate proceedings to reflect changes in 
its costs prudently incurred to comply with federal, state, 
or local environmental laws, regulations, or rules greater 
than or less than the amount set in base rates. Rate 
adjustments pursuant to this cost recovery mechanism 
would not be permitted to exceed an annual amount 
equal to 2.5% of UE’s gross jurisdictional electric 
revenues and would be subject to prudency reviews by 
the MoPSC. The storm restoration cost tracker would 
permit UE a more timely recovery of storm restoration 
operations and maintenance expenditures.  

  The MoPSC issued an electric rate order in January 

 

2009 approving an increase in annual electric revenues 
of approximately $162 million. New rates were effective 
March 1, 2009. In addition, pursuant to the accounting 
order issued by the MoPSC in April 2008, the rate order 
concluded that the $25 million of operations and 
maintenance expenses incurred as a result of a severe 
ice storm in January 2007 should be amortized and 
recovered over a five-year period starting March 1, 2009. 
The MoPSC also allowed recovery of $12 million of costs 
associated with a March 2007 FERC order that resettled 
costs among MISO market participants. UE recorded a 
regulatory asset for these costs at December 31, 2008, 
which are being amortized and recovered over a two-
year period beginning March 1, 2009.  
In its electric rate order issued in January 2009, the 
MoPSC approved UE’s implementation of a FAC and a 
vegetation management and infrastructure inspection 
cost tracking mechanism. The FAC allows an adjustment 
of electric rates three times per year for a pass-through 
to customers of 95% of changes in fuel and purchased 
power costs, net of off-system revenues, including MISO 
costs and revenues, greater or less than the amount set 
in base rates, subject to MoPSC prudency reviews. The 
vegetation management and infrastructure inspection 
cost tracking mechanism provides for the tracking of 
expenditures that are greater or less than amounts 
provided for in UE’s annual revenues for electric service 
in a particular year, subject to a 10% limitation on 
increases in any one year. The tracked amounts may be 
reflected in rates set in future rate cases.  

  Even though Taum Sauk was not available to generate 
electricity for off-system revenues during 2009, UE 
included $19 million in the calculation of the FAC as if 
Taum Sauk had generated off-system revenues. 
Therefore, UE’s customers received the benefit of Taum 
Sauk’s historical off-system revenues even though the 
plant was not operational. UE’s earnings and cash flows 

from operations will increase after Taum Sauk becomes 
operational, which is expected to be in the second 
quarter of 2010, since the adjustment factor will be 
eliminated from the FAC calculation. Taum Sauk is 
expected to increase UE’s 2010 margins by $1.8 million 
per month, when Taum Sauk returns to service in the 
second quarter of 2010.  

  UE provides power to Noranda’s smelter plant in 

New Madrid, Missouri, which has historically used 
approximately four million megawatthours of power 
annually, making Noranda UE’s single largest customer. 
As a result of a severe ice storm in January 2009, 
Noranda’s smelter plant experienced a power outage 
related to non-UE lines that deliver power to the 
substation serving the plant. Noranda stated in its Annual 
Report on Form 10-K for the year ended December 31, 
2008, that the outage affected approximately 75% of the 
smelter plant’s capacity. In a September 30, 2009, press 
release, Noranda stated that its smelter plant had 
initiated steps to return operations to full capacity. These 
steps include restarting the third of its three production 
lines. The smelter plant’s load has been rising steadily as 
repairs have been made to its production lines, with full 
production expected to be reached in the second quarter 
of 2010. As a result, UE expects its margins from sales 
to Noranda will increase by approximately $40 million in 
2010 compared with 2009. UE’s July 2009 electric rate 
case filing with the MoPSC seeks approval to revise the 
tariff under which it serves Noranda to prospectively 
address the significant lost revenues UE can incur due to 
any future operational issues at Noranda’s smelter plant 
like the revenue losses resulting from the January 2009 
storm-related power outage.  

  As part of the 2007 Illinois Electric Settlement 

Agreement, the Ameren Illinois Utilities entered into 
financial contracts with Marketing Company (for the 
benefit of Genco and AERG), to lock in energy prices for 
400 to 1,000 megawatts annually of their round-the-clock 
power requirements during the period June 1, 2008, to 
December 31, 2012, at then-relevant market prices. 
These financial contracts do not include capacity, are not 
load-following products, and do not involve the physical 
delivery of energy. Under the terms of the 2007 Illinois 
Electric Settlement Agreement, these financial contracts 
are deemed prudent, and the Ameren Illinois Utilities are 
permitted full recovery of their costs in rates.  
  Volatile power prices in the Midwest can affect the 

amount of revenues Ameren, Genco, CILCO (through 
AERG) and EEI generate by marketing power into the 
wholesale and spot markets and can influence the cost 
of power purchased in the spot markets. Spot power 
prices in the MISO were lower in 2009 than in 2008 and 
should be significantly affected by any prospect of global 
economic recovery, among other things.  

  With few scheduled maintenances outages in 2010 

through 2012, the Merchant Generation segment expects 
to have available generation of 35 million megawatthours 
in each year. However, the Merchant Generation 
segment’s actual generation levels will be significantly 

67 

 
  
impacted by market prices for power in those years, 
among other things.  

  The availability and performance of Genco’s, AERG’s 
and EEI’s electric generation fleet can materially affect 
their revenues. The Merchant Generation segment 
expects to generate 30.5 million megawatthours of power 
from its coal-fired plants in 2010 (Genco – 15.6 million, 
AERG – 7.4 million, EEI – 7.5 million) based on expected 
power prices. Should power prices rise more than 
expected, the Merchant Generation segment has the 
capacity and availability to sell more generation.  
  The marketing strategy for the Merchant Generation 

EEI – 100%) was delivered by rail from the Powder River 
Basin in Wyoming. In the past, deliveries from the 
Powder River Basin have occasionally been restricted 
because of rail maintenance, weather, and derailments. 
As of December 31, 2009, coal inventories for UE, 
Genco, AERG and EEI were at targeted levels. 
Disruptions in coal deliveries could cause UE, Genco, 
AERG and EEI to pursue a strategy that could include 
reducing sales of power during low-margin periods, 
buying higher-cost fuels to generate required electricity, 
or purchasing power from other sources.  

  Ameren’s fuel costs (including transportation) are 

segment is to optimize generation output in a low risk 
manner to minimize volatility of earnings and cash flow, 
while seeking to capitalize on its low-cost generation fleet 
to provide solid, sustainable returns. To accomplish this 
strategy, the Merchant Generation segment has 
established hedge targets for near-term years. Through a 
mix of physical and financial sales contracts, Marketing 
Company targets to hedge Merchant Generation’s 
expected output by 80% to 90% for the following year, 
50% to 70% for two years out, and 30% to 50% for three 
years out. As of January 31, 2010, Marketing Company 
had hedged approximately 26 million megawatthours of 
Merchant Generation’s expected 2010 generation, at an 
average price of $47 per megawatthour. For 2011, 
Marketing Company had hedged approximately 
18 million megawatthours of Merchant Generation’s 
forecasted generation sales at an average price of $49 
per megawatthour. For 2012, Marketing Company had 
hedged approximately 12 million megawatthours of 
Merchant Generation’s forecasted generation sales at an 
average price of $53 per megawatthour. Marketing 
Company has also entered into capacity-only sales 
contracts for 2010, 2011, and 2012, resulting in expected 
capacity-only revenues related to these contracts of $65 
million, $45 million, and $15 million, respectively. Any 
unhedged sales will be exposed to relevant market 
prices at the time of the sale.  

  The development of a capacity market in MISO could 

increase the electric margins of Genco, AERG and EEI. 
A capacity requirement obligates a load serving entity to 
acquire capacity sufficient to meet its obligations. MISO 
continues to refine its treatment of capacity supply and 
obligations, but development of a true capacity market 
could still be several years away.  

  Current and future energy efficiency programs developed 
by UE, CIPS, CILCO and IP and others could result in 
reduced demand for our electric generation and our 
electric and natural gas transmission and distribution 
services. Our regulated operations will seek a regulatory 
framework that allows either a return on these programs 
or recovery of their costs.  

Fuel and Purchased Power  

 

In 2009, 83% of Ameren’s electric generation (UE – 75%, 
Genco – 99%, AERG – 100%, EEI – 100%) was supplied 
by coal-fired power plants. About 96% of the coal used 
by these plants (UE – 96%, Genco – 99%, AERG – 89%, 

expected to increase in 2010 and beyond. As of 
December 31, 2009, Merchant Generation’s baseload 
hedged fuel costs, which include coal, transportation, 
diesel fuel surcharges, and other charges, had increased 
from an average cost of approximately $20.25 per 
megawatthour in 2009 to approximately $23.25 per 
megawatthour in 2010, $25.50 per megawatthour in 
2011, and $26.50 per megawatthour in 2012. See 
Item 7A – Quantitative and Qualitative Disclosures About 
Market Risk of this report for additional information about 
the percentage of fuel and transportation requirements 
that are price-hedged for 2010 through 2014.  

Other Costs  

 

In December 2005, there was a breach of the upper 
reservoir at UE’s Taum Sauk pumped-storage 
hydroelectric facility. This resulted in significant flooding 
in the local area, which damaged a state park. UE settled 
with the FERC and the state of Missouri all issues 
associated with the December 2005 Taum Sauk incident. 
UE has property and liability insurance coverage for the 
Taum Sauk incident, subject to certain limits and 
deductibles. Insurance does not cover lost electric 
margins or penalties paid to FERC. UE received 
approval from FERC to rebuild the upper reservoir at its 
Taum Sauk plant and is in the process of testing the 
rebuilt facility. UE expects the Taum Sauk plant to 
become operational in the second quarter of 2010. The 
estimated cost to rebuild the upper reservoir is in the 
range of $490 million. Under UE’s insurance policies, all 
claims by or against UE are subject to review by its 
insurance carriers. In July 2009, three insurance carriers 
filed a petition against Ameren in the Circuit Court of St. 
Louis County, Missouri, seeking a declaratory judgment 
that the property insurance policy does not require these 
three insurers to indemnify Ameren for their share of the 
entire cost of construction associated with the facility 
rebuild design being used. The three insurers allege that 
they, along with the other policy participants, presented a 
rebuild design that was consistent with their insurance 
coverage obligations and that the insurance policies do 
not require these insurers to pay their share of the costs 
of construction associated with the design being used. 
These insurers have estimated a cost of approximately 
$214 million for their rebuild design compared to the 
estimated $490 million cost of the design approved by 

68 

 
  
FERC and implemented by Ameren. Ameren has filed 
an answer and counterclaim in the Circuit Court of St. 
Louis County, Missouri, against these insurers. The 
counterclaim asserts that the three insurance carriers 
have breached their obligations under the property 
insurance policies issued to Ameren and UE. The 
insurers that are parties to the litigation represent 
approximately 40%, on a weighted-average basis, of 
the property insurance policy coverage between the 
disputed amounts of $214 million and $490 million. On 
August 31, 2009, Ameren and the property insurance 
carriers that are not parties to the above litigation 
reached a settlement of any and all claims, liabilities, 
and obligations arising out of, or relating to, coverage 
under its property insurance policy, including those 
related to the rebuilding of the facility and the 
reimbursement of replacement power costs. All 
payments from the settling insurance companies were 
received by UE in September 2009. Until Ameren’s 
remaining insurance claims and the related litigation 
are resolved, among other things, we are unable to 
determine the total impact the breach could have on 
Ameren’s and UE’s results of operations, financial 
position, and liquidity beyond those amounts already 
recognized. Ameren and UE expect to recover, 
through insurance, 80% to 90% of the total property 
insurance claim for the Taum Sauk incident. Beyond 
insurance, the recoverability of any Taum Sauk facility 
rebuild costs from customers is subject to the terms 
and conditions set forth in UE’s November 2007 State 
of Missouri settlement agreement. Certain costs 
associated with the Taum Sauk facility not recovered 
from property insurers may be recoverable from UE’s 
electric customers through rates established in rate 
cases filed subsequent to the in-service date of the 
rebuilt facility. As of December 31, 2009, UE had 
capitalized in property and plant qualifying Taum 
Sauk-related costs of $99 million that UE believes 
qualify for potential recovery in electric rates under the 
terms of the November 2007 State of Missouri 
Settlement. The inclusion of such costs in UE’s 
electric rates is subject to review and approval by the 
MoPSC in a future rate case. Any amounts not 
recovered through insurance, in electric rates, or 
otherwise, could result in charges to earnings, which 
could be material. See Note 15 – Commitments and 
Contingencies under Part II, Item 8, of this report for 
further discussion of Taum Sauk matters.  
  UE’s Callaway nuclear plant’s next scheduled 

refueling and maintenance outage in the spring of 
2010 is expected to last 35 days. During a scheduled 
outage, which occurs every 18 months, maintenance 
and purchased power costs increase, and the amount 
of excess power available for sale decreases, 
compared with non-outage years.  

  Over the next few years, we expect rising employee 
benefit costs, as well as higher insurance premiums 
as a result of insurance market conditions and loss 
experience, among other things.  

Other  
  A ballot initiative passed by Missouri voters in 

November 2008 created a renewable energy portfolio 
requirement. UE and other Missouri investor-owned 
utilities will be required to purchase or generate 
electricity from renewable energy sources equaling at 
least 2% of native load sales by 2011, with that 
percentage increasing in subsequent years to at least 
15% by 2021, subject to a 1% limit on customer rate 
impacts. At least 2% of each portfolio requirement 
must be derived from solar energy. Compliance with 
the renewable energy portfolio requirement can be 
achieved through the procurement of renewable 
energy or renewable energy credits. Rules 
implementing the renewable energy requirement are 
expected to be issued by the MoPSC in 2010. UE 
expects that any related costs or investments would 
ultimately be recovered in rates.  

  The U.S. Congress has considered legislation that 
would require additional government regulation of 
derivative and OTC transactions and that would 
expand collateral requirements. Legislation of this 
nature, if finalized and signed into law by the 
President, could reduce the effectiveness of hedging, 
increasing the volatility of earnings, and could require 
increased collateral postings.  
In 2009, the U.S. House of Representatives and the 
U.S. Senate each passed its own version of 
healthcare reform bills that would fundamentally 
change the U.S. healthcare system. Due to the 
uncertainty as to the final outcome of federal 
healthcare reform legislation, Ameren is unable to 
estimate the effects on any reform on its results of 
operations, financial position and liquidity.  
  Resources Company, as part of an internal 

 

 

reorganization, transferred its 80% ownership interest 
in EEI to Genco, through a capital contribution, on 
January 1, 2010.  
In an attempt to improve access to capital, reduce 
financing costs, and enhance administrative 
efficiencies, among other things, several internal 
reorganizations are being considered. CILCO is 
evaluating the transfer of AERG to Genco, and the 
Ameren Illinois Utilities are exploring a merger 
whereby CIPS, CILCO and IP would become a single 
legal entity. These internal reorganizations could 
occur in 2010.  
The above items could have a material impact on our 

results of operations, financial position, and liquidity. 
Additionally, in the ordinary course of business, we 
evaluate our strategies to enhance our results of 
operations, financial position, and liquidity. These 
strategies may include acquisitions, divestitures, 
opportunities to reduce costs or increase revenues, and 
other strategic initiatives to increase Ameren’s stockholder 
value. We are unable to predict which, if any, of these 
initiatives will be executed. The execution of these 
initiatives may have a material impact on our future results 
of operations, financial position, and liquidity. 

69 

  
  
REGULATORY MATTERS  

See Note 2 – Rate and Regulatory Matters under Part II, Item 8, of this report.  

ACCOUNTING MATTERS  
Critical Accounting Estimates  

Preparation of the financial statements and related disclosures in compliance with GAAP requires the application of 

appropriate technical accounting rules and guidance, as well as the use of estimates. These estimates involve judgments 
regarding many factors which in and of themselves could materially affect the financial statements and disclosures. We 
have outlined below the critical accounting estimates that we believe are most difficult, subjective, or complex. Any 
change in the assumptions or judgments applied in determining the following matters, among others, could have a 
material impact on future financial results.  

Accounting Estimate  
Regulatory Mechanisms and Cost Recovery  

All of the Ameren Companies except Genco defer costs 
in accordance with authoritative accounting guidance, 
and make investments that they assume will be collected 
in future rates.  

Uncertainties Affecting Application 

  Regulatory environment and external regulatory 

decisions and requirements  

  Anticipated future regulatory decisions and their 

 

impact  
Impact of deregulation, rate freezes, and competition 
on ratemaking process and ability to recover costs

Basis for Judgment  
We determine which costs are recoverable by consulting previous rulings by state regulatory authorities in jurisdictions 
where we operate or other factors that lead us to believe that cost recovery is probable. If facts and circumstances lead 
us to conclude that a recorded regulatory asset is probably no longer recoverable or plant assets are probable of 
disallowance, we record a charge to earnings, which could be material. See Note 2 – Rate and Regulatory Matters under 
Part II, Item 8, of this report for quantification of these assets by registrant.  

Unbilled Revenue  

At the end of each period, UE, CIPS, CILCO and IP 
project expected usage and estimate the amount of 
revenue to record for services that have been provided 
to customers but not yet billed.  

  Projecting customer energy usage  
  Estimating impacts of weather and other usage-

affecting factors for the unbilled period  

  Estimating loss of energy during transmission and 

delivery

Basis for Judgment  
We base our estimate of unbilled revenue each period on the volume of energy delivered, as valued by a model of billing 
cycles and historical usage rates and growth by customer class for our service area. This figure is then adjusted for the 
modeled impact of seasonal and weather variations based on historical results. See the balance sheets for each of the 
Ameren Companies, excluding Genco, under Part II, Item 8, of this report for unbilled revenue amounts.  

Derivative Financial Instruments  

We account for derivative financial instruments and 
measure their fair value in accordance with authoritative 
accounting guidance. The identification and classification 
of a derivative and the fair value of such derivative must 
be determined. See Commodity Price Risk and Fair 
Value of Contracts in Quantitative and Qualitative 
Disclosures About Market Risk under Part II, Item 7A, 
Note 7 – Derivative Financial Instruments and Note 8 - 
Fair Value Measurements under Part II, Item 8, of this 
report.  

  Our ability to assess whether derivative contracts 

qualify for the NPNS exception.  

  Ameren’s ability to consume or produce notional 

values of derivative contracts  

  Market conditions in the energy industry, especially the 

effects of price volatility and liquidity  

  Valuation assumptions on longer term contracts due to 

lack of observable inputs  

  Effectiveness of derivatives that have been designated 

as hedges  

  Counterparty default risk 

70 

  
  
 
  
  
  
  
  
 
  
Accounting Estimate    

Uncertainties Affecting Application  

Basis for Judgment  
We determine whether to exclude the fair value of certain derivatives from valuation under the normal purchase and 
normal sales provisions of authoritative accounting guidance based upon our intent and ability to physically deliver 
commodities purchased and sold. Further, our forecasted purchases and sales also support our designation of some 
fair-valued derivative instruments as cash flow hedges. Fair value of our derivatives is measured in accordance with 
authoritative accounting guidance, which provides a fair value hierarchy that prioritizes inputs to valuation techniques. 
We use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. 
When we do not have observable inputs, we use certain assumptions that market participants would use in pricing the 
asset or liability, including assumptions about risks inherent in the inputs to the valuation. Our valuations also reflect our 
own assessment of counterparty default risk, using the best internal and external information available. If we were 
required to discontinue our use of the normal purchase and normal sales exception or cash flow hedge treatment for 
some of our contracts, the impact of changes in fair value for the applicable contracts could be material to our earnings.  

Valuation of Goodwill, Intangible Assets, Long-Lived Assets, and Asset Retirement Obligations  

We periodically assess the carrying value of our 
goodwill, intangible assets, and long-lived assets to 
determine whether they are impaired. We also review for 
the existence of asset retirement obligations. If an asset 
retirement obligation is identified, we determine its fair 
value and subsequently reassess and adjust the 
obligation, as necessary.  

  Management’s identification of impairment indicators  
  Changes in business, industry, laws, technology, or 

economic and market conditions  

  Valuation assumptions and conclusions  
  Our assessment of market participants  
  Estimated useful lives of our significant long-lived 

assets  

  Actions or assessments by our regulators  
 

Identification of an asset retirement obligation and 
assumptions about the timing of asset removals 

Basis for Judgment  
Annually, or whenever events indicate a valuation may have changed, we use various methodologies we believe market 
participants would use to determine valuations, including earnings before interest, taxes, depreciation and amortization 
multiples, and discounted, undiscounted, and probabilistic discounted cash flow models with multiple operating 
scenarios. The identification of asset retirement obligations is conducted through the review of legal documents and 
interviews. See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of this report for quantification 
of our goodwill, intangible assets, and asset retirement obligations. See Note 17 – Goodwill under Part II, Item 8, of this 
report for additional information of our goodwill impairment evaluation.  

Benefit Plan Accounting  
Based on actuarial calculations, we accrue costs of 
providing future employee benefits in accordance with 
authoritative accounting guidance regarding benefit 
plans. See Note 11 – Retirement Benefits under Part II, 
Item 8, of this report.  

Interest rates used in valuing benefit obligations  

  Future rate of return on pension and other plan assets  
 
  Health care cost trend rates  
  Timing of employee retirements and mortality 

assumptions  

  Ability to recover certain benefit plan costs from our 

ratepayers  

  Changing market conditions impacting investment and 

interest rate environments

Basis for Judgment  
Our ultimate selection of the discount rate, health care trend rate, and expected rate of return on pension and other 
postretirement benefit plan assets is based on our consistent application of assumption-setting methodologies and our 
review of available historical, current, and projected rates, as applicable. See Note 11 – Retirement Benefits under Part 
II, Item 8, of this report for sensitivity of Ameren’s benefit plans to potential changes in these assumptions.  

Impact of Future Accounting Pronouncements  

See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of this report.  

71 

 
 
 
  
  
  
  
  
  
EFFECTS OF INFLATION AND CHANGING PRICES  

Ameren’s rates for retail electric and gas utility service 
are regulated by the MoPSC and the ICC. Nonretail electric 
rates are regulated by FERC. Adjustments to rates are based 
on a regulatory process that reviews a historical period. As a 
result, revenue increases will lag behind changing prices. 
Inflation affects our operations, earnings, stockholders’ 
equity, and financial performance.  

The current replacement cost of our utility plant 
substantially exceeds our recorded historical cost. Under 
existing regulatory practice, only the historical cost of plant is 
recoverable from customers. As a result, cash flows designed 
to provide recovery of historical costs through depreciation 
might not be adequate to replace the plant in future years. 
Ameren’s Merchant Generation businesses do not have 
regulated recovery mechanisms and are therefore dependent 
on market prices for power to reflect rising costs.  

As a part of the electric rate order issued by the MoPSC 
in January 2009, UE was granted permission to put in place, 
effective March 1, 2009, a FAC. Historically, in UE’s Missouri 
electric utility jurisdiction, there was no tariff for adjusting 
rates to accommodate changes in the cost of fuel for electric 
generation or the cost of purchased power. As part of its 
pending electric rate case, UE requested the MoPSC to 
approve the continued use of the FAC and implementation of 
an environmental cost recovery mechanism. The 
environmental cost recovery mechanism, if approved, would 
allow UE to adjust electric rates twice each year outside of 
general rate proceedings to reflect changes in its prudently 
incurred costs to comply with federal, state, or local 
environmental laws, regulations, or rules greater than or less 
than the amount set in base rates. Rate adjustments 
pursuant to this cost recovery mechanism would not be 
permitted to exceed an annual amount equal to 2.5% of UE’s 
gross jurisdictional electric revenues and would be subject to 
prudency reviews by the MoPSC. UE’s request was 
consistent with the environmental cost recovery rules 
approved by the MoPSC in April 2009. UE will not be able to 
implement an environmental cost recovery mechanism until 
so authorized by the MoPSC as part of a rate case 

proceeding. See Note 2 – Rate and Regulatory Matters under 
Part II, Item 8, of this report for information on UE’s pending 
electric rate case.  

CIPS, CILCO and IP recover power supply costs from 

electric customers by adjusting rates to accommodate 
changes in power prices.  

UE, CIPS, CILCO, and IP are affected by changes in the 

cost of electric transmission services. FERC regulates the 
rates charged and the terms and conditions for electric 
transmission services. Each RTO separately files regional 
transmission tariff rates for approval by FERC. All members 
within that RTO are then subjected to those rates. As 
members of MISO, UE’s CIPS’, CILCO’s and IP’s 
transmission rates are calculated in accordance with MISO’s 
rate formula. The transmission rate is updated in June of 
each year based on FERC filings. This rate is charged 
directly to wholesale customers. The Ameren Illinois Utilities 
also charge this rate directly to alternative retail electric 
suppliers. For the Ameren Illinois Utilities’ retail customers 
who have not chosen an alternative retail electric supplier, 
the transmission rate is collected through a rider mechanism. 
This rate is not directly charged to Missouri retail customers 
because the MoPSC includes transmission-related costs in 
setting bundled retail rates in Missouri.  

In our Missouri and Illinois retail gas utility jurisdictions, 

changes in gas costs are generally reflected in billings to gas 
customers through PGA clauses.  

UE, Genco, and AERG are affected by changes in 

market prices for natural gas to the extent that they must 
purchase natural gas to run CTs. These companies have 
structured various supply agreements to maintain access to 
multiple gas pools and supply basins, and to minimize the 
impact to their financial statements. See Quantitative and 
Qualitative Disclosures About Market Risk – Commodity 
Price Risk under Part II, Item 7A, below for additional 
information. Also see Note 2 – Rate and Regulatory Matters 
under Part II, Item 8, of this report for additional information 
on the cost recovery mechanisms discussed above.  

ITEM  7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.  

Market risk is the risk of changes in value of a physical 
asset or a financial instrument, derivative or nonderivative, 
caused by fluctuations in market variables such as interest 
rates, commodity prices, and equity security prices. A 
derivative is a contract whose value is dependent on, or 
derived from, the value of some underlying asset. The 
following discussion of our risk management activities 
includes forward-looking statements that involve risks and 
uncertainties. Actual results could differ materially from those 
projected in the forward-looking statements. We handle 
market risks in accordance with established policies, which 
may include entering into various derivative transactions. In 
the normal course of business, we also face risks that are 
either nonfinancial or nonquantifiable. Such risks, principally 
business, legal and operational risks, are not part of the 
following discussion.  

Our risk management objective is to optimize our 

physical generating assets and to pursue market 
opportunities within prudent risk parameters. Our risk 
management policies are set by a risk management steering 
committee, which is composed of senior-level Ameren 
officers.  

Interest Rate Risk  

We are exposed to market risk through changes in 

interest rates associated with:  

long-term and short-term variable-rate debt;  
fixed-rate debt; and  

 
 
  auction-rate long-term debt.  

72 

  
  
  
UE, CIPS, Genco, CILCO, AERG, IP, AFS and 

Marketing Company may have credit exposure associated 
with interchange or wholesale purchase and sale activity with 
nonaffiliated companies. At December 31, 2009, UE’s, CIPS’, 
Genco’s, CILCO’s, AERG’s, IP’s, AFS’, and Marketing 
Company’s combined credit exposure to nonaffiliated non-
investment-grade trading counterparties was $2 million, net 
of collateral (2008 – less than $1 million). We establish credit 
limits for these counterparties and monitor the 
appropriateness of these limits on an ongoing basis through 
a credit risk management program. It involves daily exposure 
reporting to senior management, master trading and netting 
agreements, and credit support, such as letters of credit and 
parental guarantees. We also analyze each counterparty’s 
financial condition before we enter into sales, forwards, 
swaps, futures or option contracts, and we monitor 
counterparty exposure associated with our leveraged lease. 
We estimate our credit exposure to MISO associated with the 
MISO Energy and Operating Reserves Market to be 
$13 million at December 31, 2009 (2008 – $46 million).  

Equity Price Risk  

Our costs for providing defined benefit retirement and 
postretirement benefit plans are dependent upon a number of 
factors, including the rate of return on plan assets. Ameren 
manages plan assets in accordance with the “prudent 
investor” guidelines contained in ERISA. Ameren’s goal is to 
ensure that sufficient funds are available to provide the 
benefits at the time they are payable and also to maximize 
total return on plan assets and minimize expense volatility 
consistent with its tolerance for risk. Ameren delegates 
investment management to specialists in each asset class. 
Where appropriate, Ameren provides the investment 
manager with guidelines that specify allowable and prohibited 
investment types. Ameren regularly monitors manager 
performance and compliance with investment guidelines.  

The expected return on plan assets is based on historical 

and projected rates of return for current and planned asset 
classes in the investment portfolio. Projected rates of return 
for each asset class were estimated after an analysis of 
historical experience, future expectations, and the volatility of 
the various asset classes. After considering the target asset 
allocation for each asset class, we adjusted the overall 
expected rate of return for the portfolio for historical and 
expected experience of active portfolio management results 
compared with benchmark returns and for the effect of 
expenses paid from plan assets.  

In future years, the costs of such plans reflected in net 

income, OCI, or regulatory assets, and cash contributions to 
the plans could increase materially, without pension asset 
portfolio investment returns equal to or in excess of our 
assumed return on plan assets of 8%.  

UE also maintains a trust fund, as required by the NRC 

and Missouri law, to fund certain costs of nuclear plant 
decommissioning. As of December 31, 2009, this fund was 

We manage our interest rate exposure by controlling the 

amount of these instruments we have within our total 
capitalization portfolio and by monitoring the effects of market 
changes in interest rates.  

The following table presents the estimated increase in 
our annual interest expense and decrease in net income if 
interest rates were to increase by 1% on variable-rate debt 
outstanding at December 31, 2009:  

Interest Expense 
$  12   
2   
-   
-   
3   
(c ) 

Ameren(b)  .............................  
UE  .......................................  
CIPS .....................................  
Genco ...................................  
CILCO ..................................  
IP   .......................................  
(a)  Calculations are based on an effective tax rate of 38%.  
(b) 
(c)  Less than $1 million.  

Includes intercompany eliminations.  

Net  Income(a) 
$   (7 ) 
(1 ) 
-   
-   
(2 ) 
(c ) 

The estimated changes above do not consider the 
potential reduced overall economic activity that would exist in 
such an environment. In the event of a significant change in 
interest rates, management would probably act to further 
mitigate our exposure to this market risk. However, due to the 
uncertainty of the specific actions that would be taken and 
their possible effects, this sensitivity analysis assumes no 
change in our financial structure.  

Credit Risk  

Credit risk represents the loss that would be recognized 

if counterparties fail to perform as contracted. Exchange-
traded contracts are supported by the financial and credit 
quality of the clearing members of the respective exchanges 
and have nominal credit risk. In all other transactions, we are 
exposed to credit risk in the event of nonperformance by the 
counterparties to the transaction. See Note 7 – Derivative 
Financial Instruments under Part II, Item 8, of this report for 
information on the potential loss on counterparty exposure as 
of December 31, 2009.  

Our revenues are primarily derived from sales or delivery 

of electricity and natural gas to customers in Missouri and 
Illinois. Our physical and financial instruments are subject to 
credit risk consisting of trade accounts receivables and 
executory contracts with market risk exposures. The risk 
associated with trade receivables is mitigated by the large 
number of customers in a broad range of industry groups 
who make up our customer base. At December 31, 2009, no 
nonaffiliated customer represented more than 10%, in the 
aggregate, of our accounts receivable. The risk associated 
with the Ameren Illinois Utilities’ electric and natural gas trade 
receivables is also mitigated by a rate adjustment mechanism 
that allows the Ameren Illinois Utilities to recover the 
difference between their actual bad debt expense and the 
bad debt expense included in their base rates. UE and the 
Ameren Illinois Utilities continue to monitor the impact of 
increasing rates and a weak economic environment on 
customer collections. UE and the Ameren Illinois Utilities 
make adjustments to their allowance for doubtful accounts as 
deemed necessary to ensure that such allowances are 
adequate to cover estimated uncollectible customer account 
balances. 

73 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
presence in the market, we are able to identify and pursue 
opportunities, which can generate additional returns 
through portfolio management and trading activities. All of 
this activity is performed within a controlled risk 
management process. We establish value at risk (VaR) 
and stop-loss limits that are intended to prevent any 
negative material financial impact.  

We manage risks associated with changing prices of 
fuel for generation using techniques similar to those used 
to manage risks associated with changing market prices 
for electricity. Most UE, Genco and AERG fuel supply 
contracts are physical forward contracts. Genco, AERG 
and EEI do not have the ability to pass through higher fuel 
costs to their customers for electric operations. Prior to 
March 2009, UE did not have this ability either except 
through a general rate proceeding. As a part of the 
January 2009 MoPSC electric rate order, UE was granted 
permission to put a FAC in place, which became effective 
March 1, 2009. UE remains exposed to 5% of changes in 
its fuel and purchased power costs, net of off-system 
revenues. UE, Genco, AERG and EEI have entered into 
long-term contracts with various suppliers to purchase 
coal to manage their exposure to fuel prices. The coal 
hedging strategy is intended to secure a reliable coal 
supply while reducing exposure to commodity price 
volatility. Price and volumetric risk mitigation is 
accomplished primarily through periodic bid procedures, 
whereby the amount of coal purchased is determined by 
the current market prices and the minimum and maximum 
coal purchase guidelines for the given year. UE, Genco, 
AERG and EEI generally purchase coal up to five years in 
advance, but we may purchase coal beyond five years to 
take advantage of favorable deals or market conditions. 
The strategy also allows for the decision not to purchase 
coal to avoid unfavorable market conditions.  

Transportation costs for coal and natural gas can be a 

significant portion of fuel costs. UE, Genco, AERG and 
EEI typically hedge coal transportation forward to provide 
supply certainty and to mitigate transportation price 
volatility. Natural gas transportation expenses for 
Ameren’s gas distribution utility companies and the gas-
fired generation units of UE, Genco, AERG and EEI are 
regulated by FERC through approved tariffs governing the 
rates, terms, and conditions of transportation and storage 
services. Certain firm transportation and storage capacity 
agreements held by the Ameren Companies include rights 
to extend the contracts prior to the termination of the 
primary term. Depending on our competitive position, we 
are able in some instances to negotiate discounts to these 
tariff rates for our requirements. 

invested primarily in domestic equity securities (67%) and 
debt securities (33%). It totaled $293 million (2008 – 
$239 million). By maintaining a portfolio that includes long-
term equity investments, UE seeks to maximize the 
returns to be used to fund nuclear decommissioning costs 
within acceptable parameters of risk. However, the equity 
securities included in the portfolio are exposed to price 
fluctuations in equity markets. The debt securities are 
exposed to changes in interest rates. UE actively monitors 
the portfolio by benchmarking the performance of its 
investments against certain indices and by maintaining 
and periodically reviewing established target allocation 
percentages of the assets of the trust to various 
investment options. UE’s exposure to equity price market 
risk is in large part mitigated, because UE is currently 
allowed to recover its decommissioning costs, which 
would include unfavorable investment results, through 
electric rates.  

Commodity Price Risk  

We are exposed to changes in market prices for 

electricity, emission allowances, fuel, and natural gas. 
UE’s, Genco’s, AERG’s and EEI’s risks of changes in 
prices for power sales are partially hedged through sales 
agreements. Genco, AERG and EEI also seek to sell 
power forward to wholesale, municipal, and industrial 
customers to limit exposure to changing prices. We also 
attempt to mitigate financial risks through risk 
management programs and policies, which include 
forward-hedging programs, and the use of derivative 
financial instruments (primarily forward contracts, futures 
contracts, option contracts, and financial swap contracts). 
However, a portion of the generation capacity of UE, 
Genco, AERG and EEI is not contracted through physical 
or financial hedge arrangements and is therefore exposed 
to volatility in market prices.  

The following table shows how our earnings might 

decrease if power prices were to decrease by 1% on 
unhedged economic generation for 2010 through 2013:  

Ameren(b)  .....................................................................  
UE  ...............................................................................  
Genco ...........................................................................  
CILCO (AERG) .............................................................  
EEI ...............................................................................  
(a)  Calculations are based on an effective tax rate of 38%.  
(b) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries 
and intercompany eliminations.  

Net  Income(a) 
$   (22) 
(7) 
(8) 
(3) 
(6) 

Ameren also uses its portfolio management and 
trading capabilities both to manage risk and to deploy risk 
capital to generate additional returns. Due to our physical 

74 

  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
The following table presents the percentages of the projected required supply of coal and coal transportation for our 

coal-fired power plants, nuclear fuel for UE’s Callaway nuclear plant, natural gas for our CTs, and retail distribution, as 
appropriate, and purchased power needs of CIPS, CILCO and IP, which own no generation, that are price-hedged over 
the five-year period 2010 through 2014, as of December 31, 2009. The projected required supply of these commodities 
could be significantly affected by changes in our assumptions for such matters as customer demand for our electric 
generation and our electric and natural gas distribution services, generation output, and inventory levels, among other 
matters.  

2010 

Ameren: 
Coal .......................................................................................................................................................................    
97% 
Coal transportation.................................................................................................................................................     100  
Nuclear fuel ...........................................................................................................................................................     100  
Natural gas for generation ......................................................................................................................................    
73  
Natural gas for distribution(a) ..................................................................................................................................     
96  
Purchased power for Illinois Regulated(b) ................................................................................................................    
82  
UE: 
Coal .......................................................................................................................................................................    
98% 
Coal transportation.................................................................................................................................................     100  
Nuclear fuel ...........................................................................................................................................................     100  
Natural gas for generation ......................................................................................................................................    
89  
Natural gas for distribution(a) ..................................................................................................................................     
97  
CIPS: 
Natural gas for distribution(a) ..................................................................................................................................     
Purchased power(b) ................................................................................................................................................    
Genco: 
Coal .......................................................................................................................................................................    
97% 
Coal transportation.................................................................................................................................................     100  
Natural gas for generation ......................................................................................................................................     100  
CILCO: 
Coal (AERG) ..........................................................................................................................................................    
97% 
Coal transportation (AERG) ...................................................................................................................................     100  
Natural gas for distribution(a) ..................................................................................................................................     
93  
Purchased power(b) ................................................................................................................................................    
82  
IP: 
Natural gas for distribution(a) ..................................................................................................................................     
Purchased power(b) ................................................................................................................................................    
EEI: 
Coal .......................................................................................................................................................................    
97% 
Coal transportation.................................................................................................................................................     100  

99% 
82  

91% 
82  

2011 

2012 – 2014 

61% 
93   
89   
8   
45   
55   

61% 
  100   
89   
11   
48   

40% 
55   

61% 
70   
19   

63% 
  100   
47   
55   

46% 
55   

60% 
  100   

15% 
40  
58  
-  
20  
16  

14% 
44  
58  
-  
27  

17% 
16  

16% 
24  
-  

18% 
57  
20  
16  

19% 
16  

14% 
34  

(a)  Represents the percentage of natural gas price-hedged for peak winter season of November through March. The year 2010 represents January 2010 
through March 2010. The year 2011 represents November 2010 through March 2011. This continues each successive year through March 2014.  
(b)  Represents the percentage of purchased power price-hedged for fixed-price residential and small commercial customers with less than one megawatt of 

demand. Larger customers are purchasing power from the competitive markets. See Note 2 – Rate and Regulatory Matters and Note 15 – Commitments and 
Contingencies under Part II, Item 8, of this report for a discussion of the Illinois power procurement process and for additional information on the Ameren 
Illinois Utilities’ purchased power commitments.  

75 

  
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
  
  
  
 
 
 
  
Fuel 
Expense 

Fuel 
Expense 
$   17 
7 
6 
1 
2 

Net 
Income(a)  
$   (12) 
(7) 
(3) 
(1) 
(1) 

The following table shows how our total fuel expense 
might increase and how our net income might decrease if 
coal and coal transportation costs were to increase by 1% 
on any requirements not currently covered by fixed-price 
contracts for the five-year period 2010 through 2014.  
Transportation 
Coal 
Net 
Income(a)  
$  (10) 
(4) 
(4) 
(1) 
(1) 

Ameren(b)  ....................  $   19 
UE  ..............................    11 
Genco .........................   
4 
CILCO .........................   
2 
EEI ..............................   
2 
(a)  Calculations are based on an effective tax rate of 38%.  
(b) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
In addition, coal and coal transportation costs are 
sensitive to the price of diesel fuel as a result of rail freight 
fuel surcharges. If diesel fuel costs were to increase or 
decrease by $0.25/gallon, Ameren’s fuel expense could 
increase or decrease by $10 million annually (UE – 
$5 million, Genco – $2 million, AERG – $1 million and EEI 
– $2 million). As of December 31, 2009, Ameren had a 
price cap for approximately 93% of expected fuel 
surcharges in 2010.  

In the event of a significant change in coal prices, UE, 

Genco, AERG and EEI would probably take actions to 
further mitigate their exposure to this market risk. 
However, due to the uncertainty of the specific actions that 
would be taken and their possible effects, this sensitivity 
analysis assumes no change in our financial structure or 
fuel sources.  

With regard to exposure for commodity price risk for 

nuclear fuel, UE has both fixed-priced and base-price-
with- escalation agreements. It also uses inventories that 
provide some price hedge to fulfill its Callaway nuclear 
plant needs for uranium, conversion, enrichment, and 
fabrication services. There is no fuel reloading scheduled 
for 2012. UE has price hedges for 75% of the 2010 to 
2014 nuclear fuel requirements.  

Nuclear fuel market prices remain subject to an 
unpredictable supply and demand environment. UE has 
continued to follow a strategy of managing its inventory of 
nuclear fuel as an inherent price hedge. New long-term 
uranium contracts are almost exclusively market-price-
related with an escalating price floor. New long-term 
enrichment contracts usually have some market-price-
related component. UE expects to enter into additional 
contracts from time to time in order to supply nuclear fuel 
during the expected life of the Callaway nuclear plant, at 
prices that cannot now be accurately predicted. Unlike the 
electricity and natural gas markets, nuclear fuel markets 
have limited financial instruments available for price 
hedging, so most hedging is done through inventories and 
forward contracts, if they are available.  

With regard to the electric generating operations for 

UE, Genco and AERG that are exposed to changes in 
market prices for natural gas used to run CTs, the natural 
gas procurement strategy is designed to ensure reliable 
and  

76 

immediate delivery of natural gas while minimizing costs. 
We optimize transportation and storage options and price 
risk by structuring supply agreements to maintain access 
to multiple gas pools and supply basins.  

Through the market allocation process, UE, CIPS, 

Genco, CILCO and IP have been granted FTRs 
associated with the MISO Energy and Operating Reserves 
Market. In addition, Marketing Company has acquired 
FTRs for its participation in the PJM-Northern Illinois 
market. The FTRs are intended to mitigate expected 
electric transmission congestion charges related to the 
physical electricity business. Depending on the congestion 
and prices at various points on the electric transmission 
grid, FTRs could result in either charges or credits. 
Complex grid modeling tools are used to determine which 
FTRs to nominate in the FTR allocation process. There is 
a risk of incorrectly modeling the amount of FTRs needed, 
and there is the potential that the FTRs could be 
ineffective in mitigating transmission congestion charges.  
With regard to UE’s, CIPS’, CILCO’s and IP’s electric 

and natural gas distribution businesses, exposure to 
changing market prices is in large part mitigated by the 
fact that there are cost recovery mechanisms in place. 
These cost recovery mechanisms allow UE, CIPS, CILCO 
and IP to pass on to retail customers prudently incurred 
fuel, purchased power and gas supply costs. UE’s, CIPS’, 
CILCO’s and IP’s strategy is designed to reduce the effect 
of market fluctuations for our regulated customers. The 
effects of price volatility cannot be eliminated. However, 
procurement strategies involve risk management 
techniques and instruments similar to those outlined 
earlier, as well as the management of physical assets.  

With regard to our exposure for commodity price risk 

for construction and maintenance activities, Ameren is 
exposed to changes in market prices for metal 
commodities and labor availability.  

See Supply for Electric Power under Part I, Item 1, of 

this report for the percentages of our historical needs 
satisfied by coal, nuclear power, natural gas, hydroelectric 
power, and oil. Also see Note 15 – Commitments and 
Contingencies under Part II, Item 8, of this report for 
additional information.  

Fair Value of Contracts  

We use derivatives principally to manage the risk of 

changes in market prices for natural gas, coal, diesel, 
electricity, uranium, and emission allowances. Such price 
fluctuations may cause the following:  
  an unrealized appreciation or depreciation of our 

contracted commitments to purchase or sell when 
purchase or sale prices under the commitments are 
compared with current commodity prices;  
  market values of coal, natural gas, and uranium 

inventories or emission allowances that differ from the 
cost of those commodities in inventory; and  
  actual cash outlays for the purchase of these 

commodities that differ from anticipated cash outlays.

  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The derivatives that we use to hedge these risks are 

governed by our risk management policies for forward 
contracts, futures, options, and swaps. Our net positions 
are continually assessed within our structured hedging 
programs to determine whether new or offsetting 
transactions are required. The goal of the hedging 
program is generally to mitigate financial risks while 

ensuring that sufficient volumes are available to meet our 
requirements. Contracts we enter into as part of our risk 
management program may be settled financially, settled 
by physical delivery, or net settled with the counterparty. 
See Note 7 – Derivative Financial Instruments under Part 
II, Item 8, of this report for additional information. 

The following table presents the favorable (unfavorable) changes in the fair value of all derivative contracts marked-

to-market during the year ended December 31, 2009. We use various methods to determine the fair value of our 
contracts. In accordance with hierarchy levels outlined in authoritative accounting guidance, the sources we used to 
determine the fair value of these contracts were active quotes (Level 1), inputs corroborated by market data (Level 2), and 
other modeling and valuation methods that are not corroborated by market data (Level 3). All of these contracts have 
maturities of less than five years.  

Fair value of contracts at beginning of year, net .......................   $ 
Contracts realized or otherwise settled during the period ..........  
Changes in fair values attributable to changes in valuation 

Ameren (a) 
20  
43  
-  
technique and assumptions ................................................  
Fair value of new contracts entered into during the period ........  
52  
Other changes in fair value ......................................................  
(98) 
Fair value of contracts outstanding at end of year, net ..............   $          17   

UE 

$ 

16  
(10) 
-  
22  
(12) 
$         16   

CIPS 

$ 

(84) 
54  
-  
(3) 
(122) 
$         (155)  

Genco 
$ 

(1) 
1  
-  
11  
2  
$         13   

CILCO 

$ 

(59)  $ 
57    
-    
2    
(75)   
$          (75)   $ 

IP 

(134 ) 
102  
-  
(13 ) 
(202 ) 
        (247)  

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  
The following table presents maturities of derivative contracts as of December 31, 2009, based on the hierarchy levels 

used to determine the fair value of the contracts:  

Sources of Fair Value 
Ameren: 
Level 1 .......................................................................................................  
Level 2(a) ....................................................................................................  
Level 3(b) ....................................................................................................  
Total ..........................................................................................................  
UE: 
Level 1 .......................................................................................................  
Level 2(a) ....................................................................................................  
Level 3(b) ....................................................................................................  
Total ..........................................................................................................  
CIPS: 
Level 1 .......................................................................................................  
Level 2(a) ....................................................................................................  
Level 3(b) ....................................................................................................  
Total ..........................................................................................................  
Genco: 
Level 1 .......................................................................................................  
Level 2(a) ....................................................................................................  
Level 3(b) ....................................................................................................  
Total ..........................................................................................................  
CILCO: 
Level 1 .......................................................................................................  
Level 2(a) ....................................................................................................  
Level 3(b) ....................................................................................................  
Total ..........................................................................................................  

Maturity 
Less than  
1 Year 

Maturity 
1 - 3 Years 

Maturity 
4 - 5 Years 

Maturity in 
Excess of 
5 Years  

Total 
Fair Value  

$ 

$ 

$ 

$ 

$ 

$ 

(8) 
1  
20  
13  

(3) 
-  
5  
2  

-  
-  
(53) 
(53) 

$ 

$ 

$ 

$ 

$ 

$ 

(4) 
-  
12  
8  

(3) 
-  
18  
15  

-  
-  
(102) 
(102) 

$ 

$ 

$ 

$ 

$ 

$ 

(1) 
-  
(3) 
(4) 

(1) 
-  
-  
(1) 

-  
-  
-  
-  

$ 

$ 

$ 

$ 

$ 

$ 

-   
-   
-   
-   

-   
-   
-   
-   

-   
-   
-   
-   

$ 

$ 

$ 

$ 

$ 

$ 

(13) 
1  
29  
17  

(7) 
-  
23  
16  

-  
-  
(155) 
(155) 

$              -  
-  
5  
5  

$ 

$              -  
-  
(22) 
(22) 

$ 

$              -  
-  
8  
8  

$ 

$              -  
-  
(53) 
(53) 

$ 

$              -  
-  
-  
-  

$ 

$              -  
-  
-  
-  

$ 

$               -   
-   
-   
-   

$ 

$               -   
-   
-   
-   

$ 

$               -  
-  
13  
13  

$ 

$               -  
-  
(75) 
(75) 

$ 

77 

 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
. 

Sources of Fair Value 

Maturity 
Less than  
1 Year 

Maturity 
1 - 3 Years 

Maturity 
4 - 5 Years 

Maturity in 
Excess of 
5 Years  

Total 
Fair Value  

IP:  
Level 1 .......................................................................................................  
Level 2(a) ....................................................................................................  
Level 3(b) ....................................................................................................  
Total ..........................................................................................................  
(a)  Principally fixed-price vs. floating over-the-counter power swaps, power forwards, and fixed price vs. floating over-the-counter natural gas swaps.  
(b)  Principally power forward contract values based on a Black-Scholes model that includes information from external sources and our estimates. Level 3 also 

$           (1) 
-  
(160) 
(161) 

$             -  
-  
(2) 
(2) 

$             -  
-  
(84) 
(84) 

          (1) 
-  
(246) 
(247) 

        - 
- 
- 
- 

  $ 

  $ 

$ 

$ 

$ 

$ 

$ 

includes option contract values based on our estimates.  

ITEM  8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.  
Report of Independent Registered Public Accounting Firm  
To the Board of Directors and Shareholders  
of Ameren Corporation:  
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all 
material respects, the financial position of Ameren Corporation and its subsidiaries at December 31, 2009 and 2008, and 
the results of their operations and their cash flows for each of the three years in the period ended December 31, 2009, in 
conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the 
financial statement schedules listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the 
information set forth therein when read in conjunction with the related consolidated financial statements. Also, in our 
opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of 
December 31, 2009, based on criteria established in Internal Control – Integrated Framework issued by the Committee of 
Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these 
financial statements and financial statement schedules, for maintaining effective internal control over financial reporting 
and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report 
on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these 
financial statements, on the financial statement schedules, and on the Company’s internal control over financial reporting 
based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company 
Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain 
reasonable assurance about whether the financial statements are free of material misstatement and whether effective 
internal control over financial reporting was maintained in all material respects. Our audits of the financial statements 
included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, 
assessing the accounting principles used and significant estimates made by management, and evaluating the overall 
financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding 
of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating 
the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing 
such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable 
basis for our opinions.  
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the 
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and 
procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the 
transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are 
recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting 
principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of 
management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely 
detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the 
financial statements.  

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, 
projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become 
inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may 
deteriorate.  
/s/PricewaterhouseCoopers LLP  
PricewaterhouseCoopers LLP  
St. Louis, Missouri  
February 26, 2010  

78 

 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
   
 
 
 
 
   
   
Report of Independent Registered Public Accounting Firm  
To the Board of Directors and Shareholders  
of Union Electric Company:  
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all 
material respects, the financial position of Union Electric Company and its subsidiaries at December 31, 2009 and 2008, 
and the results of their operations and their cash flows for each of the three years in the period ended December 31, 
2009, in conformity with accounting principles generally accepted in the United States of America. In addition, in our 
opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material 
respects, the information set forth therein when read in conjunction with the related consolidated financial statements. 
These financial statements and financial statement schedule are the responsibility of the Company’s management. Our 
responsibility is to express an opinion on these financial statements and financial statement schedule based on our audits. 
We conducted our audits of these statements in accordance with the standards of the Public Company Accounting 
Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a 
test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting 
principles used and significant estimates made by management, and evaluating the overall financial statement 
presentation. We believe that our audits provide a reasonable basis for our opinion.  
/s/PricewaterhouseCoopers LLP  
PricewaterhouseCoopers LLP  
St. Louis, Missouri  
February 26, 2010  

Report of Independent Registered Public Accounting Firm  
To the Board of Directors and Shareholders  
of Central Illinois Public Service Company:  
In our opinion, the financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all material 
respects, the financial position of Central Illinois Public Service Company at December 31, 2009 and 2008, and the results 
of its operations and its cash flows for each of the three years in the period ended December 31, 2009, in conformity with 
accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial 
statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the 
information set forth therein when read in conjunction with the related financial statements. These financial statements 
and financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an 
opinion on these financial statements and financial statement schedule based on our audits. We conducted our audits of 
these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). 
Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial 
statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the 
amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates 
made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a 
reasonable basis for our opinion.  
/s/PricewaterhouseCoopers LLP  
PricewaterhouseCoopers LLP  
St. Louis, Missouri  
February 26, 2010  

Report of Independent Registered Public Accounting Firm  
To the Board of Directors and Shareholder  
of Ameren Energy Generating Company:  
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all 
material respects, the financial position of Ameren Energy Generating Company and its subsidiaries at December 31, 
2009 and 2008, and the results of their operations and their cash flows for each of the three years in the period ended 
December 31, 2009, in conformity with accounting principles generally accepted in the United States of America. These 
financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on 
these financial statements based on our audits. We conducted our audits of these statements in accordance with the 
standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and 
perform the audit to obtain reasonable assurance about whether the financial statements are free of material 
misstatement. An audit includes examining, on a test  

79 

  
basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles 
used and significant estimates made by management, and evaluating the overall financial statement presentation. We 
believe that our audits provide a reasonable basis for our opinion.  
/s/PricewaterhouseCoopers LLP  
PricewaterhouseCoopers LLP  
St. Louis, Missouri  
February 26, 2010  

Report of Independent Registered Public Accounting Firm  
To the Board of Directors and Shareholders  
of Central Illinois Light Company:  
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all 
material respects, the financial position of Central Illinois Light Company and its subsidiaries at December 31, 2009 and 
2008, and the results of their operations and their cash flows for each of the three years in the period ended 
December 31, 2009, in conformity with accounting principles generally accepted in the United States of America. In 
addition, in our opinion, the financial statement schedules listed in the index appearing under Item 15(a)(2) present fairly, 
in all material respects, the information set forth therein when read in conjunction with the related consolidated financial 
statements. These financial statements and financial statement schedules are the responsibility of the Company’s 
management. Our responsibility is to express an opinion on these financial statements and financial statement schedules 
based on our audits. We conducted our audits of these statements in accordance with the standards of the Public 
Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes 
examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the 
accounting principles used and significant estimates made by management, and evaluating the overall financial statement 
presentation. We believe that our audits provide a reasonable basis for our opinion.  
/s/PricewaterhouseCoopers LLP  
PricewaterhouseCoopers LLP  
St. Louis, Missouri  
February 26, 2010  

Report of Independent Registered Public Accounting Firm  
To the Board of Directors and Shareholders  
of Illinois Power Company:  
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all 
material respects, the financial position of Illinois Power Company and its subsidiary at December 31, 2009 and 2008, and 
the results of their operations and their cash flows for each of the three years in the period ended December 31, 2009, in 
conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the 
financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the 
information set forth therein when read in conjunction with the related consolidated financial statements. These financial 
statements and financial statement schedule are the responsibility of the Company’s management. Our responsibility is to 
express an opinion on these financial statements and financial statement schedule based on our audits. We conducted 
our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board 
(United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about 
whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence 
supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and 
significant estimates made by management, and evaluating the overall financial statement presentation. We believe that 
our audits provide a reasonable basis for our opinion.  
/s/PricewaterhouseCoopers LLP  
PricewaterhouseCoopers LLP  
St. Louis, Missouri  
February 26, 2010  

80 

   
AMEREN CORPORATION  
CONSOLIDATED STATEMENT OF INCOME  
(In millions, except per share amounts)  

Year Ended December 31,  
2008  

2009  

2007  

Operating Revenues: 

Electric 
Gas 

Total operating revenues 

Operating Expenses: 

Fuel 
Purchased power 
Gas purchased for resale 
Other operations and maintenance 
Depreciation and amortization 
Taxes other than income taxes 
Total operating expenses 

Operating Income 

Other Income and Expenses: 

Miscellaneous income 
Miscellaneous expense 
Total other income 

Interest Charges 

Income Before Income Taxes 

Income Taxes 

Net Income 

Less: Net Income Attributable to Noncontrolling Interests 

Net Income Attributable to Ameren Corporation 

Earnings per Common Share – Basic and Diluted 
Dividends per Common Share 
Average Common Shares Outstanding 

$  5,909   
1,181   
7,090   

1,141   
909   
749   
1,738   
725   
412   
5,674   
     1,416   

71   
(23)  
48   

508   

956   

332   

624   

12   

612   

2.78   
1.54   
220.4   

$ 

$ 

$ 

$  6,367   
1,472   
7,839   

1,275   
1,210   
1,057   
1,857   
685   
393   
     6,477   
1,362   

80   
(31)  
49   

440   

971   

327   

644   

39   

605   

2.88   
2.54   
210.1   

$ 

$ 

$ 

$  6,283   
1,279   
7,562   

1,167   
1,387   
900   
1,687   
681   
381   
     6,203   
1,359   

75   
(25)  
50   

423   

986   

330   

656   

38   

618   

2.98   
2.54   
207.4   

$ 

$ 

$ 

The accompanying notes are an integral part of these consolidated financial statements.  

81 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
  
  
  
  
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
 
 
 
  
AMEREN CORPORATION  
CONSOLIDATED BALANCE SHEET  
(In millions, except per share amounts)  

December 31,  

2009  

2008  

Current Assets: 

ASSETS 

Cash and cash equivalents 
Accounts receivable – trade (less allowance for doubtful accounts of $24 and $28, respectively) 
Unbilled revenue 
Miscellaneous accounts and notes receivable 
Materials and supplies 
Mark-to-market derivative assets 
Other current assets 

Total current assets 
Property and Plant, Net 
Investments and Other Assets: 

Nuclear decommissioning trust fund 
Goodwill 
Intangible assets 
Regulatory assets 
Other assets 

Total investments and other assets 

TOTAL ASSETS 

LIABILITIES AND EQUITY 

Current Liabilities: 

Current maturities of long-term debt 
Short-term debt 
Accounts and wages payable 
Taxes accrued 
Interest accrued 
Customer deposits 
Mark-to-market derivative liabilities 
Other current liabilities 

Total current liabilities 
Credit Facility Borrowings 
Long-term Debt, Net 
Deferred Credits and Other Liabilities: 

Accumulated deferred income taxes, net 
Accumulated deferred investment tax credits 
Regulatory liabilities 
Asset retirement obligations 
Pension and other postretirement benefits 
Other deferred credits and liabilities 

Total deferred credits and other liabilities 

Commitments and Contingencies (Notes 2, 14, 15 and 16) 
Ameren Corporation Stockholders’ Equity: 

Common stock, $.01 par value, 400.0 shares authorized – shares outstanding of 237.4 and 212.3, 

respectively 

Other paid-in capital, principally premium on common stock 
Retained earnings 
Accumulated other comprehensive loss 

Total Ameren Corporation stockholders’ equity 

Noncontrolling Interests 

Total equity 

TOTAL LIABILITIES AND EQUITY 

$ 

622    $ 
434   
367   
308   
782   
121   
208   
2,842   
  17,610   

92   
516   
427   
315   
842   
207   
209   
2,608   
  16,567   

293   
831   
129   
1,430   
655   
3,338   

239   
831   
167   
1,653   
606   
3,496   
$  23,790    $  22,671   

$ 

204    $ 

20   
694   
54   
110   
101   
109   
419   
1,711   
830   
7,113   

2,554   
94   
1,338   
429   
1,165   
496   
6,076   

380   
1,174   
813   
54   
107   
126   
155   
268   
3,077   
-   
6,554   

2,131   
100   
1,291   
406   
1,495   
438   
5,861   

2   
5,412   
2,455   
(16)  
7,853   
207   
8,060   

2   
4,780   
2,181   
-   
6,963   
216   
7,179   
$   23,790    $   22,671   

The accompanying notes are an integral part of these consolidated financial statements.  

82 

  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
  
  
  
 
 
  
  
  
  
  
  
  
AMEREN CORPORATION  
CONSOLIDATED STATEMENT OF CASH FLOWS  
(In millions)  

Year Ended December 31,  
2008  

2009  

2007  

Cash Flows From Operating Activities: 

Net income 
Adjustments to reconcile net income to net cash provided by operating activities: 

  $   624    

  $   644    

  $   656    

Gain on sales of emission allowances 
Loss on asset impairments 
Net mark-to-market gain on derivatives 
Depreciation and amortization 
Amortization of nuclear fuel 
Amortization of debt issuance costs and premium/discounts 
Deferred income taxes and investment tax credits, net 
Other 
Changes in assets and liabilities: 

Receivables 
Materials and supplies 
Accounts and wages payable 
Taxes accrued 
Assets, other 
Liabilities, other 
Pension and other postretirement benefits 
Counterparty collateral, net 
Taum Sauk costs, net of insurance recoveries 

Net cash provided by operating activities 
Cash Flows From Investing Activities: 

Capital expenditures 
Nuclear fuel expenditures 
Purchases of securities – nuclear decommissioning trust fund 
Sales of securities – nuclear decommissioning trust fund 
Purchases of emission allowances 
Sales of emission allowances 
Other 

Net cash used in investing activities 
Cash Flows From Financing Activities: 

Dividends on common stock 
Capital issuance costs 
Short-term and credit facility borrowings, net 
Dividends paid to noncontrolling interest holders 
Redemptions, repurchases, and maturities: 

Long-term debt 
Preferred stock 

Issuances: 

Common stock 
Long-term debt 

Generator advances received for construction, net 

Net cash provided by financing activities 
Net change in cash and cash equivalents 
Cash and cash equivalents at beginning of year 
Cash and cash equivalents at end of year 

Cash Paid During the Year: 

(6)   
7    
(23)   
748    
53    
25    
402    
(17)   

21    
67    
(42)   
-    
(66)   
103    
(9)   
(17)   
107    
1,977    

(1,704)   
(80)   
(383)   
380    
(4)   
-    
2    
(1,789)   

(338)   
(65)   
(324)   
(21)   

(631)   
-    

634    
1,021    
66    
342    
530    
92    
  $   622    

(8)   
14    
(3)   
705    
37    
20    
167    
(9)   

12    
(100)   
57    
(30)   
83    
113    
(4)   
(25)   
(149)   
1,524    

(1,896)   
(173)   
(520)   
497    
(14)   
6    
3    
(2,097)   

(534)   
(12)   
(298)   
(40)   

(842)   
(16)   

154    
1,879    
19    
310    
(263)   
355    
$   92    

(8)   
-    
(3)   
735    
37    
19    
(28)   
9    

(172)   
(88)   
-    
21    
42    
(44)   
27    
(39)   
(56)   
1,108    

(1,381)   
(68)   
(142)   
128    
(24)   
5    
14    
(1,468)   

(527)   
(4)   
860    
(32)   

(488)   
(1)   

91    
674    
5    
578    
218    
137    
  $   355    

Interest (net of $40, $41, and $31 capitalized, respectively) 
Income taxes, net 

  $   478    
9    

  $   409    
106    

  $   391    
283    

The accompanying notes are an integral part of these consolidated financial statements.  

83 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
  
  
  
  
  
  
  
 
 
 
  
AMEREN CORPORATION  
CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY  
(In millions)  

Common Stock: 

Beginning of year 
Shares issued 

Common stock, end of year 

Other Paid-in Capital: 
Beginning of year 
Shares issued (less issuance costs of $17, $-, and $-, respectively) 
Stock-based compensation cost 

Other paid-in capital, end of year 

Retained Earnings: 
Beginning of year 
Net income attributable to Ameren Corporation 
Dividends 
Adjustment to adopt new accounting standard 

Retained earnings, end of year 

Accumulated Other Comprehensive Income (Loss): 
Derivative financial instruments, beginning of year 
Change in derivative financial instruments 

Derivative financial instruments, end of year 
Deferred retirement benefit costs, beginning of year 
Change in deferred retirement benefit costs 

Deferred retirement benefit costs, end of year 

Total accumulated other comprehensive income (loss), end of year 

Total Ameren Corporation Stockholders’ Equity 
Noncontrolling Interests: 

Beginning of year 
Net income attributable to noncontrolling interests 
Dividends paid to noncontrolling interest holders 

Noncontrolling interests, end of year 

Total Equity 

Comprehensive Income, Net of Taxes: 

Net income 
Unrealized net gain (loss) on derivative hedging instruments, net of income taxes 

(benefit) of $78, $65, and $(7), respectively 

Reclassification adjustments for derivative (gains) included in net income, net of 

income taxes of $82, $43, and $22, respectively 

Reclassification adjustment due to implementation of FAC, net of income taxes 

of $18, $-, and $-, respectively 

Pension and other postretirement activity, net of income taxes (benefit) of $22, 

$(45), and $1, respectively 

2009  

December 31,  
2008  

2007  

$ 

$ 

2   
-   
2   

$ 

2   
-   
2   

2   
-   
2   

4,780   
617   
15   
5,412   

2,181   
612   
(338)  
-   
2,455   

4,604   
154   
22   
4,780   

2,110   
605   
(534)  
-   
2,181   

4,495   
91   
18   
4,604   

2,024   
618   
(527)  
(5)  
2,110   

48   
(38)  
10   
(48)  
22   
(26)  
(16)  
$    7,853   

216   
12   
(21)  
207   
$  8,060   

9   
39   
48   
27   
(75)  
(48)  
-   
$    6,963   

217   
39   
(40)  
216   
$  7,179   

60   
(51)  
9   
2   
25   
27   
36   
$    6,752   

211   
38   
(32)  
217   
$  6,969   

$ 

624   

$ 

644   

$ 

656   

103   

(112)  

(29)  

22   
608   
(12)  

$ 

116   

(77)  

-   

(75)  
608   
(39)  

$ 

(12)  

(39)  

-   

25   
630   
(38)  

Total Comprehensive Income, Net of Taxes 
Comprehensive income attributable to noncontrolling interests 
Total Comprehensive Income Attributable to Ameren Corporation, Net of 

$ 

Taxes 

Common stock shares at beginning of year 

Shares issued 

Common stock shares at end of year 

$ 

596   

$ 

569   

$ 

592   

212.3   
25.1   
237.4   

208.3   
4.0   
212.3   

206.6   
1.7   
208.3   

The accompanying notes are an integral part of these consolidated financial statements.  

84 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
UNION ELECTRIC COMPANY  
CONSOLIDATED STATEMENT OF INCOME  
(In millions)  

Year Ended December 31,  
2008  

2009  

2007  

Operating Revenues: 

Electric 
Gas 
Other 

Total operating revenues 

Operating Expenses: 

Fuel 
Purchased power 
Gas purchased for resale 
Other operations and maintenance 
Depreciation and amortization 
Taxes other than income taxes 
Total operating expenses 

Operating Income 

Other Income and Expenses: 

Miscellaneous income 
Miscellaneous expense 
Total other income 

Interest Charges 

Income Before Income Taxes and Equity in Income of Unconsolidated 

Investment 

Income Taxes 

Income Before Equity in Income of Unconsolidated Investment 

Equity in Income of Unconsolidated Investment, Net of Taxes 

Net Income 

Preferred Stock Dividends 

$  2,700   
170   
4   
  2,874   

593   
124   
97   
880   
357   
257   
     2,308   
566   

$  2,756   
201   
3   
  2,960   

672   
160   
123   
922   
329   
240   
     2,446   
514   

$  2,786   
174   
1   
  2,961   

608   
192   
104   
900   
333   
234   
     2,371   
590   

63   
(7)  
56   

62   
(9)  
53   

38   
(7)  
31   

229   

193   

194   

393   

128   

265   

-   

265   

6   

374   

134   

240   

11   

251   

6   

427   

140   

287   

55   

342   

6   

Net Income Available to Common Stockholder 

$ 

259   

$ 

245   

$ 

336   

The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.  

85 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
  
UNION ELECTRIC COMPANY  
BALANCE SHEET  
(In millions, except per share amounts)  

Current Assets: 

ASSETS 

Cash and cash equivalents 
Accounts receivable – trade (less allowance for doubtful accounts of $6 and $8, respectively) 
Accounts receivable – affiliates 
Unbilled revenue 
Miscellaneous accounts and notes receivable 
Materials and supplies 
Mark-to-market derivative assets 
Current regulatory assets 
Other current assets 

Total current assets 
Property and Plant, Net 
Investments and Other Assets: 

Nuclear decommissioning trust fund 
Intangible assets 
Regulatory assets 
Other assets 

Total investments and other assets 

TOTAL ASSETS 

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Current Liabilities: 

Current maturities of long-term debt 
Short-term debt 
Intercompany note payable – Ameren 
Accounts and wages payable 
Accounts payable – affiliates 
Taxes accrued 
Interest accrued 
Other current liabilities 

Total current liabilities 

Long-term Debt, Net 
Deferred Credits and Other Liabilities: 

Accumulated deferred income taxes, net 
Accumulated deferred investment tax credits 
Regulatory liabilities 
Asset retirement obligations 
Pension and other postretirement benefits 
Other deferred credits and liabilities 

Total deferred credits and other liabilities 

Commitments and Contingencies (Notes 2, 14, 15 and 16) 
Stockholders’ Equity: 

Common stock, $5 par value, 150.0 shares authorized – 102.1 shares outstanding 
Other paid-in capital, principally premium on common stock 
Preferred stock not subject to mandatory redemption 
Retained earnings 
Accumulated other comprehensive income 

Total stockholders’ equity 

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 

December 31,  

2009  

2008  

$ 

267    $ 
154   
22   
127   
199   
346   
31   
63   
19   
1,228   
9,585   

-   
147   
32   
111   
281   
339   
50   
10   
28   
998   
8,995   

293   
35   
765   
395   
1,488   

239   
48   
897   
352   
1,536   
$  12,301    $  11,529   

$ 

4    $ 
-   
-   
336   
132   
21   
63   
127   
683   
4,018   

1,660   
79   
947   
331   
400   
126   
3,543   

4   
251   
92   
360   
151   
20   
56   
126   
1,060   
3,673   

1,372   
80   
922   
317   
494   
49   
3,234   

511   
1,555   
113   
1,878   
-   
4,057   

511   
1,119   
113   
1,794   
25   
3,562   
$   12,301    $   11,529   

The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.  

86 

  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
UNION ELECTRIC COMPANY  
CONSOLIDATED STATEMENT OF CASH FLOWS  
(In millions)  

Cash Flows From Operating Activities: 

Net income 
Adjustments to reconcile net income to net cash provided by operating 

$  265   

$  251   

$  342   

Year Ended December 31,  
2008  

2009  

2007  

activities: 
Gain on sales of emission allowances 
Net mark-to-market (gain) loss on derivatives 
Depreciation and amortization 
Amortization of nuclear fuel 
Amortization of debt issuance costs and premium/discounts 
Deferred income taxes and investment tax credits, net 
Other 
Changes in assets and liabilities: 

Receivables 
Materials and supplies 
Accounts and wages payable 
Taxes accrued 
Assets, other 
Liabilities, other 
Pension and other postretirement benefits 
Taum Sauk costs, net of insurance recoveries 

Net cash provided by operating activities 
Cash Flows From Investing Activities: 

Capital expenditures 
Nuclear fuel expenditures 
Money pool advances, net 
Proceeds from intercompany note receivable 
Purchases of securities – nuclear decommissioning trust fund 
Sales of securities – nuclear decommissioning trust fund 
Sales of emission allowances 
Net cash used in investing activities 
Cash Flows From Financing Activities: 

Dividends on common stock 
Dividends on preferred stock 
Capital issuance costs 
Short-term debt, net 
Intercompany note payable – Ameren, net 
Redemptions, repurchases, and maturities of long-term debt 
Issuances of long-term debt 
Capital contribution from parent 
Other 

Net cash provided by financing activities 
Net change in cash and cash equivalents 
Cash and cash equivalents at beginning of year 
Cash and cash equivalents at end of year 
Cash Paid (Refunded) During the Year: 

Interest (net of $23, $19, and $15 capitalized, respectively) 
Income taxes, net 

(5)  
(29)  
357   
53   
10   
276   
(30)  

(58)  
(2)  
16   
1   
(58)  
71   
(2)  
107   
972   

(872)  
(80)  
-   
-   
(383)  
380   
-   
    (955)  

(175)  
(6)  
(14)  
(251)  
(92)  
(4)  
349   
436   
7   
250   
267   
-   
$  267   

(5)  
29   
329   
37   
6   
89   
(28)  

60   
(32)  
(89)  
(61)  
42   
64   
-   
(149)  
543   

(874)  
(173)  
-   
36   
(520)  
497   
1   
  (1,033)  

(264)  
(6)  
(5)  
169   
92   
(382)  
699   
-   
2   
305   
(185)  
185   
-   

$ 

(5)  
(2)  
333   
37   
6   
1   
(6)  

(60)  
(65)  
42   
12   
39   
(49)  
18   
(56)  
587   

(625)  
(68)  
3   
-   
(142)  
128   
4   
    (700)  

(267)  
(6)  
(3)  
(152)  
(77)  
(4)  
424   
380   
2   
297   
184   
1   
$  185   

$  212   
(208)  

$  177   
130   

$  203   
106   

The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.  

87 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
UNION ELECTRIC COMPANY  
CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY  
(In millions)  

Common Stock 

Other Paid-in Capital: 
Beginning of year 
Capital contribution from parent 

Other paid-in capital, end of year 

Preferred Stock Not Subject to Mandatory Redemption 

Retained Earnings: 
Beginning of year 
Net income 
Common stock dividends 
Preferred stock dividends 
Dividend-in-kind to Ameren 
Adjustment to adopt new accounting standard 

Retained earnings, end of year 

Accumulated Other Comprehensive Income: 

Beginning of year 
Change in derivative financial instruments 

Accumulated other comprehensive income, end of year 

Total Stockholders’ Equity 
Comprehensive Income, Net of Taxes: 

Net income 
Unrealized net gain on derivative hedging instruments, net of income taxes 

of $11, $22, and $-, respectively 

Reclassification adjustments for derivative (gains) included in net income, net 

of income taxes of $8, $9, and $2, respectively 

Reclassification adjustment due to implementation of FAC, net of income 

taxes of $18, $-, and $-, respectively 
Total Comprehensive Income, Net of Taxes 

December 31,  
2008  

2007  

2009  

$ 

511   

$ 

511   

$ 

511   

1,119   
436   
1,555   
113   

1,794   
265   
(175)  
(6)  
-   
-   
1,878   

1,119   
-   
1,119   
113   

1,855   
251   
(264)  
(6)  
(42)  
-   
1,794   

739   
380   
1,119   
113   

1,783   
342   
(267)  
(6)  
-   
3   
1,855   

25   
(25)  
-   
$    4,057   

3   
22   
25   
$    3,562   

7   
(4)  
3   
$    3,601   

$ 

265   

$ 

251   

$ 

342   

17   

(13)  

(29)  
240   

36   

(14)  

-   
273   

-   

(4)  

-   
338   

$ 

$ 

$ 

The accompanying notes as they relate to UE are an integral part of these consolidated financial statements.  

88 

  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
STATEMENT OF INCOME  
(In millions)  

Year Ended December 31,  
2008  

2007  

  2009    

Operating Revenues: 

Electric 
Gas 
Other 

Total operating revenues 

Operating Expenses: 
Purchased power 
Gas purchased for resale 
Other operations and maintenance 
Depreciation and amortization 
Taxes other than income taxes 
Total operating expenses 

Operating Income 

Other Income and Expenses: 

Miscellaneous income 
Miscellaneous expense 
Total other income 

Interest Charges 

Income Before Income Taxes 

Income Taxes 

Net Income 

Preferred Stock Dividends 

$  642   
224   
3   
   869   

$  720   
259   
3   
   982   

$  772   
230   
3   
    1,005   

372   
143   
181   
68   
37   
801   
68   

8   
(2)  
6   

29   

45   

16   

29   

3   

461   
179   
196   
67   
37   
940   
42   

11   
(3)  
8   

30   

20   

5   

15   

3   

527   
157   
172   
66   
34   
956   
49   

17   
(3)  
14   

37   

26   

9   

17   

3   

Net Income Available to Common Stockholder 

$ 

26   

$ 

12   

$ 

14   

The accompanying notes as they relate to CIPS are an integral part of these financial statements.  

89 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
  
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
BALANCE SHEET  
(In millions)  

Current Assets: 

ASSETS 

Cash and cash equivalents 
Accounts receivable – trade (less allowance for doubtful accounts of $5 and $6, respectively) 
Accounts receivable – affiliates 
Unbilled revenue 
Miscellaneous accounts and notes receivable 
Current portion of intercompany note receivable – Genco 
Current portion of intercompany tax receivable – Genco 
Materials and supplies 
Counterparty collateral asset 
Current regulatory assets 
Deferred taxes 
Other current assets 

Total current assets 
Property and Plant, Net 
Investments and Other Assets: 

Intercompany note receivable – Genco 
Intercompany tax receivable – Genco 
Regulatory assets 
Other assets 

Total investments and other assets 

TOTAL ASSETS 

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Current Liabilities: 
Short-term debt 
Borrowings from money pool 
Accounts and wages payable 
Accounts payable – affiliates 
Taxes accrued 
Customer deposits 
Mark-to-market derivative liabilities 
Mark-to-market derivative liabilities – affiliates 
Environmental remediation 
Other current liabilities 

Total current liabilities 

Long-term Debt, Net 
Deferred Credits and Other Liabilities: 
Accumulated deferred income taxes 
Accumulated deferred investment tax credits 
Regulatory liabilities 
Pension and other postretirement benefits 
Other deferred credits and liabilities 

Total deferred credits and other liabilities 

Commitments and Contingencies (Notes 2, 14 and 15) 
Stockholders’ Equity: 

Common stock, no par value, 45.0 shares authorized – 25.5 shares outstanding 
Other paid-in capital 
Preferred stock not subject to mandatory redemption 
Retained earnings 

Total stockholders’ equity 

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 

December 31,  

2009  

2008  

$ 

28   
53   
12   
52   
14   
45   
9   
47   
2   
59   
18   
3   
342   
1,268   

-   
82   
248   
25   
355   
$  1,965   

$ 

-   
82   
4   
74   
1   
42   
9   
70   
21   
32   
5   
2   
342   
  1,212   

45   
93   
195   
33   
366   
$  1,920   

$ 

-   
-   
48   
58   
7   
21   
10   
43   
22   
45   
254   
421   

273   
7   
242   
58   
136   
716   

$ 

62   
44   
48   
49   
7   
16   
17   
14   
7   
47   
311   
421   

259   
9   
234   
79   
78   
659   

-   
257   
50   
267   
574   
$   1,965   

-   
191   
50   
288   
529   
$   1,920   

The accompanying notes as they relate to CIPS are an integral part of these financial statements.  

90 

  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
STATEMENT OF CASH FLOWS  
(In millions)  

Year Ended December 31,  
  2008    

  2009    

  2007    

Cash Flows From Operating Activities: 

Net income 
Adjustments to reconcile net income to net cash provided by operating 

$ 

29   

$ 

15    

$ 

17    

activities: 
Depreciation and amortization 
Amortization of debt issuance costs and premium/discounts 
Deferred income taxes and investment tax credits, net 
Changes in assets and liabilities: 

Receivables 
Materials and supplies 
Accounts and wages payable 
Taxes accrued 
Assets, other 
Liabilities, other 
Pension and other postretirement benefits 

Net cash provided by operating activities 
Cash Flows From Investing Activities: 

Capital expenditures 
Proceeds from intercompany note receivable – Genco 

Net cash used in investing activities 
Cash Flows From Financing Activities: 

Dividends on common stock 
Dividends on preferred stock 
Capital issuance costs 
Short-term debt, net 
Money pool borrowings, net 
Redemptions, repurchases, and maturities of long-term debt 
Capital contribution from parent 
Other 

Net cash provided by (used in) financing activities 
Net change in cash and cash equivalents 
Cash and cash equivalents at beginning of year 
Cash and cash equivalents at end of year 
Cash Paid (Refunded) During the Year: 

Interest 
Income taxes, net 

68   
2   
(5)  

41   
23   
15   
-   
19   
(1)  
-   
       191    

67    
1    
(2)   

(5)   
(4)   
14    
(1)   
(5)   
21    
-    
101    

66    
1    
(27)   

(12)   
5    
(48)   
(2)   
14    
(3)   
3    
14    

(110)  
42   
(68)  

        (96)   
39    
(57)   

        (79)   
37    
(42)   

(47)  
(3)  
(3)  
(62)  
(44)  
-   
66   
(2)  
(95)  
28   
-   
28   

27   
24   

$ 

$ 

-    
(3)   
-    
(63)   
44    
(50)   
-    
2    
(70)   
(26)   
26    
-    

32    
(21)   

(40)   
(3)   
-    
90    
-    
-    
1    
-    
48    
20    
6    
26    

36    
  44    

$ 

$ 

$ 

$ 

The accompanying notes as they relate to CIPS are an integral part of these financial statements.  

91 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
STATEMENT OF STOCKHOLDERS’ EQUITY  
(In millions)  

Common Stock 

Other Paid-in Capital: 
Beginning of year 
Capital contribution from parent 

Other paid-in capital, end of year 

Preferred Stock Not Subject to Mandatory Redemption 

Retained Earnings: 
Beginning of year 
Net income 
Common stock dividends 
Preferred stock dividends 

Retained earnings, end of year 

Accumulated Other Comprehensive Income: 

Beginning of year 
Change in derivative financial instruments 

Accumulated other comprehensive income, end of year 

Total Stockholders’ Equity 
Comprehensive Income, Net of Taxes: 

Net income 
Reclassification adjustments for (gains) included in net income, 

net of income taxes of $-, $-, and $1, respectively 

Total Comprehensive Income, Net of Taxes 

2009  

December 31,  
2008  

2007  

$ 

-   

$ 

-   

$ 

-   

191   
66   
257   
50   

288   
29   
(47)  
(3)  
267   

191   
-   
191   
50   

276   
15   
-   
(3)  
288   

190   
1   
191   
50   

302   
17   
(40)  
(3)  
276   

-   
-   
-   
$       574   

$ 

$ 

29   

-   
29   

-   
-   
-   
$       529   

$ 

$ 

15   

-   
15   

1   
(1)  
-   
$       517   

$ 

$ 

17   

(1)  
16   

The accompanying notes as they relate to CIPS are an integral part of these financial statements.  

92 

  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
AMEREN ENERGY GENERATING COMPANY  
CONSOLIDATED STATEMENT OF INCOME  
(In millions)  

Operating Revenues 

Operating Expenses: 

Fuel 
Coal contract settlement 
Purchased power 
Other operations and maintenance 
Depreciation and amortization 
Taxes other than income taxes 
Total operating expenses 

Operating Income 

Other Income and Expenses: 

Miscellaneous income 
Miscellaneous expense 
Total other income 

Interest Charges 

Income Before Income Taxes 

Income Taxes 

Net Income 

Year Ended December 31,  

2009  

2008  

$ 

850   

$ 

908   

2007  

$ 

876   

278   
-   
-   
172   
69   
21   
540   
310   

-   
-   
-   

59   

251   

96   

377   
(60)  
-   
175   
65   
21   
578   
330   

1   
(1)  
-   

55   

275   

100   

344   
-   
23   
163   
69   
19   
618   
258   

-   
-   
-   

55   

203   

78   

$       155   

$ 

  175   

$       125   

The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.  

93 

  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
  
AMEREN ENERGY GENERATING COMPANY  
CONSOLIDATED BALANCE SHEET  
(In millions, except shares)  

ASSETS 

Current Assets: 

Cash and cash equivalents 
Accounts receivable – affiliates 
Miscellaneous accounts and notes receivable 
Advances to money pool 
Materials and supplies 
Other current assets 

Total current assets 
Property and Plant, Net 
Intangible Assets 
Other Assets 

TOTAL ASSETS 

Current Liabilities: 

LIABILITIES AND STOCKHOLDER’S EQUITY 

Current maturities of long-term debt 
Current portion of intercompany note payable – CIPS 
Borrowings from money pool 
Accounts and wages payable 
Accounts payable – affiliates 
Current portion of intercompany tax payable – CIPS 
Taxes accrued 
Deferred taxes 
Other current liabilities 

Total current liabilities 

Long-term Debt, Net 
Intercompany Note Payable – CIPS 
Deferred Credits and Other Liabilities: 

Accumulated deferred income taxes, net 
Accumulated deferred investment tax credits 
Intercompany tax payable – CIPS 
Asset retirement obligations 
Pension and other postretirement benefits 
Other deferred credits and liabilities 

Total deferred credits and other liabilities 

Commitments and Contingencies (Notes 2, 14 and 15) 
Stockholder’s Equity: 

Common stock, no par value, 10,000 shares authorized – 2,000 shares outstanding 
Other paid-in capital 
Retained earnings 
Accumulated other comprehensive loss 

Total stockholder’s equity 

TOTAL LIABILITIES AND STOCKHOLDER’S EQUITY 

December 31,  

2009  

2008  

$ 

6   
103   
22   
73   
132   
10   
346   
2,135   
34   
20   
$  2,535   

$ 

2   
88   
20   
-   
122   
5   
237   
  1,950   
49   
8   
$  2,244   

$ 

200   
45   
-   
71   
36   
9   
17   
26   
34   
438   
823   
-   

190   
4   
82   
53   
51   
32   
412   

$ 

-   
42   
80   
82   
58   
9   
16   
15   
28   
330   
774   
45   

136   
6   
93   
49   
67   
49   
400   

-   
503   
396   
(37)  
862   
$   2,535   

-   
503   
241   
(49)  
695   
$   2,244   

The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.  

94 

  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
AMEREN ENERGY GENERATING COMPANY  
CONSOLIDATED STATEMENT OF CASH FLOWS  
(In millions)  

Year Ended December 31,  
2008  

2009  

2007  

Cash Flows From Operating Activities: 

Net income 
Adjustments to reconcile net income to net cash provided by operating 

$ 

155   

$ 

175   

$ 

125   

activities: 
Gain on sales of emission allowances 
Net mark-to-market (gain) loss on derivatives 
Depreciation and amortization 
Amortization of debt issuance costs and discounts 
Deferred income taxes and investment tax credits, net 
Loss on asset impairment 
Other 
Changes in assets and liabilities: 

Receivables 
Materials and supplies 
Accounts and wages payable 
Taxes accrued 
Assets, other 
Liabilities, other 
Pension and other postretirement benefits 

Net cash provided by operating activities 
Cash Flows From Investing Activities: 

Capital expenditures 
Money pool advances, net 
Purchases of emission allowances 
Sales of emission allowances 
Other 

Net cash used in investing activities 
Cash Flows From Financing Activities: 

Dividends on common stock 
Capital issuance costs 
Short-term debt, net 
Money pool borrowings, net 
Intercompany note payable – CIPS 
Issuances of long-term debt 
Capital contribution from parent 

Net cash provided by (used in) financing activities 
Net change in cash and cash equivalents 
Cash and cash equivalents at beginning of year 
Cash and cash equivalents at end of year 
Cash Paid During the Year: 

Interest (net of $11, $10, and $6 capitalized, respectively) 
Income taxes, net 

-   
(17)  
86   
2   
55   
6   
-   

(17)  
(10)  
(9)  
1   
7   
(28)  
1   
232   

(2)  
16   
92   
-   
14   
-   
-   

(18)  
(29)  
(11)  
1   
12   
(5)  
1   
246   

(2)  
(2)  
101   
-   
30   
-   
1   

10   
3   
(4)  
(7)  
3   
(8)  
5   
255   

       (277)  
(73)  
(2)  
1   
2   
(349)  

      (317)  
-   
(13)  
2   
(2)  
(330)  

       (191)  
-   
(20)  
1   
-   
(210)  

-   
(6)  
-   
(80)  
(42)  
249   
-   
121   
4   
2   
6   

56   
85   

(101)  
(2)  
(100)  
26   
(39)  
300   
-   
84   
-   
2   
2   

51   
62   

$ 

$ 

(113)  
-   
100   
(69)  
(37)  
-   
75   
(44)  
1   
1   
2   

53   
49   

$ 

$ 

$ 

$ 

The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.  

95 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
AMEREN ENERGY GENERATING COMPANY  
CONSOLIDATED STATEMENT OF STOCKHOLDER’S EQUITY  
(In millions)  

Common Stock 

Other Paid-in Capital: 
Beginning of year 
Capital contribution from parent 

Other paid-in capital, end of year 

Retained Earnings: 
Beginning of year 
Net income 
Common stock dividends 
Adjustment to adopt new accounting standard 

Retained earnings, end of year 

Accumulated Other Comprehensive Loss: 

Derivative financial instruments, beginning of year 
Change in derivative financial instruments 

Derivative financial instruments, end of year 
Deferred retirement benefit costs, beginning of year 
Change in deferred retirement benefit costs 

Deferred retirement benefit costs, end of year 

Total accumulated other comprehensive loss, end of year 

Total Stockholder’s Equity 
Comprehensive Income, Net of Taxes: 

Net income 
Unrealized net (loss) on derivative hedging instruments, net of 

income taxes (benefit) of $-, $-, and $(2), respectively 

Reclassification adjustments for derivative gains included in net 
income, net of income taxes of $-, $3, and $1, respectively 
Pension and other postretirement activity, net of income taxes 

(benefit) of $9, $(19), and $5, respectively 
Total Comprehensive Income, Net of Taxes 

December 31,  

2009  

2008  

$ 

-   

$ 

-   

503   
-   
503   

241   
155   
-   
-   
396   

(6)  
-   
(6)  
(43)  
12   
(31)  
(37)  
$      862   

$ 

155   

-   

-   

        503   
-   
503   

167   
175   
(101)  
-   
241   

(1)  
(5)  
(6)  
(21)  
(22)  
(43)  
(49)  
695   

175   

-   

(5)  

$ 

$ 

2007  

$ 

-   

        428   
75   
503   

156   
125   
(113)  
(1)  
167   

3   
(4)  
(1)  
(24)  
3   
(21)  
(22)  
648   

125   

(3)  

(1)  

$ 

$ 

12   
167   

(22)  
148   

$ 

$ 

3   
124   

$ 

The accompanying notes as they relate to Genco are an integral part of these consolidated financial statements.  

96 

  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
CENTRAL ILLINOIS LIGHT COMPANY  
CONSOLIDATED STATEMENT OF INCOME  
(In millions)  

Year Ended December 31,  
2008  

2009  

2007  

Operating Revenues: 

Electric 
Gas 
Support services – affiliates 
Other 

Total operating revenues 

Operating Expenses: 

Fuel 
Purchased power 
Gas purchased for resale 
Other operations and maintenance 
Depreciation and amortization 
Taxes other than income taxes 
Total operating expenses 

Operating Income 

Other Income and Expenses: 

Miscellaneous income 
Miscellaneous expense 

Total other expenses 

Interest Charges 

Income Before Income Taxes 

Income Taxes 

Net Income 

Preferred Stock Dividends 

$ 

729   
277   
70   
6   
    1,082   

115   
169   
189   
260   
70   
27   
830   
252   

1   
(5)  
(4)  

41   

207   

72   

135   

1   

Net Income Available to Common Stockholder 

$ 

134   

$ 

$ 

771   
375   
-   
1   
    1,147   

121   
291   
284   
217   
77   
25   
  1,015   
132   

2   
(5)  
(3)  

21   

$ 

681   
329   
-   
1   
    1,011   

71   
280   
237   
184   
73   
23   
868   
143   

5   
(6)  
(1)  

27   

108   

115   

39   

69   

1   

68   

39   

76   

2   

74   

$ 

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.  

97 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
  
CENTRAL ILLINOIS LIGHT COMPANY  
CONSOLIDATED BALANCE SHEET  
(In millions)  

ASSETS 

Current Assets: 

Cash and cash equivalents 
Accounts receivable –trade (less allowance for doubtful accounts of $3 and $3, respectively)  
Accounts receivable – affiliates 
Unbilled revenue 
Miscellaneous accounts and notes receivable 
Materials and supplies 
Current regulatory assets 
Other current assets 

Total current assets 
Property and Plant, Net 
Investments and Other Assets: 

Intangible assets 
Regulatory assets 
Other assets 

Total investments and other assets 

TOTAL ASSETS 

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Current Liabilities: 
Short-term debt 
Borrowings from money pool 
Intercompany note payable – Ameren 
Accounts and wages payable 
Accounts payable – affiliates 
Taxes accrued 
Mark-to-market derivative liabilities 
Mark-to-market derivative liabilities – affiliates 
Other current liabilities 

Total current liabilities 

Long-term Debt, Net 
Deferred Credits and Other Liabilities: 

Accumulated deferred income taxes, net 
Accumulated deferred investment tax credits 
Regulatory liabilities 
Pension and other postretirement benefits 
Asset retirement obligations 
Other deferred credits and liabilities 

Total deferred credits and other liabilities 

Commitments and Contingencies (Notes 2, 14 and 15) 
Stockholders’ Equity: 

Common stock, no par value, 20.0 shares authorized – 13.6 shares outstanding 
Other paid-in capital 
Preferred stock not subject to mandatory redemption 
Retained earnings 
Accumulated other comprehensive loss 

Total stockholders’ equity 

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 

December 31,  

2009  

2008  

$ 

88   
39   
68   
43   
16   
107   
29   
18   
408   
  1,789   

1   
162   
22   
185   
$  2,382   

$ 

-   
62   
51   
65   
-   
131   
24   
35   
368   
  1,734   

1   
171   
22   
194   
$  2,296   

$ 

-   
-   
288   
62   
50   
5   
10   
19   
72   
506   
279   

214   
4   
209   
193   
34   
88   
742   

$ 

236   
98   
-   
117   
83   
8   
21   
7   
62   
632   
279   

171   
5   
206   
216   
28   
75   
701   

-   
480   
19   
354   
2   
855   
$   2,382   

-   
429   
19   
240   
(4)  
684   
$   2,296   

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.  

98 

  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
CENTRAL ILLINOIS LIGHT COMPANY  
CONSOLIDATED STATEMENT OF CASH FLOWS  
(In millions)  

Cash Flows From Operating Activities: 

Net income 
Adjustments to reconcile net income to net cash provided by operating 

$ 

135   

$ 

69   

$ 

76   

Year Ended December 31,  
2008  

2007  

2009  

activities: 
Net mark-to-market (gain) loss on derivatives 
Depreciation and amortization 
Amortization of debt issuance costs and premium/discounts 
Deferred income taxes and investment tax credits, net 
Loss on asset impairment 
Changes in assets and liabilities: 

Receivables 
Materials and supplies 
Accounts and wages payable 
Taxes accrued 
Assets, other 
Liabilities, other 
Pension and postretirement benefits 

Net cash provided by operating activities 
Cash Flows From Investing Activities: 

Capital expenditures 
Money pool advances, net 
Purchases of emission allowances 
Other 

Net cash used in investing activities 
Cash Flows From Financing Activities: 

Dividends on common stock 
Dividends on preferred stock 
Capital issuance costs 
Short-term debt, net 
Intercompany note payable – Ameren, net 
Money pool borrowings, net 
Redemptions, repurchases, and maturities of: 

Long-term debt 
Preferred stock 

Issuances of long-term debt 
Capital contribution from parent 
Other 

Net cash provided by (used in) financing activities 
Net change in cash and cash equivalents 
Cash and cash equivalents at beginning of year 
Cash and cash equivalents at end of year 
Cash Paid (Refunded) During the Year: 

Interest (net of $1, $8, and $8 capitalized, respectively) 
Income taxes, net 

(10)  
72   
3   
40   
1   

9   
24   
(38)  
(3)  
21   
-   
9   
263   

(154)  
-   
(1)  
2   
(153)  

9   
77   
1   
15   
12   

(17)  
(21)  
65   
5   
(7)  
10   
(11)  
207   

-   
74   
1   
(1)  
-   

(32)  
(17)  
(6)  
(2)  
(7)  
(13)  
1   
74   

(319)  
-   
-   
2   
(317)  

(254)  
42   
-   
-   
       (212)  

(20)  
(1)  
(7)  
       (236)  
288   
(98)  

-   
(1)  
(1)  
      (109)  
-   
98   

-   
-   
-   
51   
1   
(22)  
88   
-   
88   

37   
82   

(19)  
(16)  
150   
-   
2   
104   
(6)  
6   
-   

24   
(15)  

$ 

$ 

$ 

$ 

-   
(2)  
-   
180   
-   
-   

(50)  
(1)  
-   
14   
-   
141   
3   
3   
6   

30   
35   

$ 

$ 

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.  

99 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
CENTRAL ILLINOIS LIGHT COMPANY  
CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY  
(In millions)  

Common Stock 

Other Paid-in Capital: 
Beginning of year 
Capital contribution from parent 

Other paid-in capital, end of year 

Preferred Stock Not Subject to Mandatory Redemption 

Retained Earnings: 
Beginning of year 
Net income 
Common stock dividends 
Preferred stock dividends 
Adjustment to adopt new accounting standard 

Retained earnings, end of year 

Accumulated Other Comprehensive Income (Loss): 
Derivative financial instruments, beginning of year 
Change in derivative financial instruments 

Derivative financial instruments, end of year 
Deferred retirement benefit costs, beginning of year 
Change in deferred retirement benefit costs 

Deferred retirement benefit costs, end of year 

Total accumulated other comprehensive income (loss), end of year 

Total Stockholders’ Equity 
Comprehensive Income, Net of Taxes: 

Net income 
Unrealized net (loss) on derivative hedging instruments, net of income taxes 

(benefit) of $-, $-, and $(1), respectively 

Reclassification adjustments for derivative (gains) included in net income, net 

of income taxes of $-, $1, and $1, respectively 

Pension and other postretirement activity, net of income taxes (benefit) of $4, 

$(4), and $2, respectively 

Total Comprehensive Income, Net of Taxes 

December 31,  
2008  
$ 

-   

  429   
-   
  429   
19   

  172   
69   
-   
(1)  
-   
  240   

1   
(1)  
-   
1   
(5)  
(4)  
(4)  
$   684   

2009  
$ 

-   

  429   
51   
  480   
19   

  240   
  135   
(20)  
(1)  
-   
  354   

-   
-   
-   
(4)  
6   
2   
2   
$   855   

2007  
$ 

-   

  415   
14   
  429   
19   

99   
76   
-   
(2)  
(1)  
  172   

4   
(3)  
1   
(2)  
3   
1   
2   
$   622   

$  135   

$  69   

$  76   

-   

-   

-   

(1)  

(1)  

(2)  

6   
$  141   

(5)  
$  63   

3   
$  76   

The accompanying notes as they relate to CILCO are an integral part of these consolidated financial statements.  

100 

  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
ILLINOIS POWER COMPANY  
CONSOLIDATED STATEMENT OF INCOME  
(In millions)  

Year Ended December 31,  
2008  

2007  

  2009    

Operating Revenues: 

Electric 
Gas 
Other 

Total operating revenues 

Operating Expenses: 
Purchased power 
Gas purchased for resale 
Other operations and maintenance 
Depreciation and amortization 
Amortization of regulatory assets 
Taxes other than income taxes 
Total operating expenses 

Operating Income 

Other Income and Expenses: 

Miscellaneous income 
Miscellaneous expense 
Total other income 

Interest Charges 

Income Before Income Taxes 

Income Taxes 

Net Income 

Preferred Stock Dividends 

$  992   
501   
11   
  1,504   

509   
310   
275   
99   
17   
64   
    1,274   
230   

3   
(3)  
-   

98   

132   

53   

79   

2   

Net Income Available to Common Stockholder 

$ 

77   

$ 

$ 1,071   
620   
5   
  1,696   

654   
452   
318   
85   
17   
67   
    1,593   
103   

11   
(5)  
6   

99   

10   

5   

5   

2   

3   

$ 1,104   
540   
2   
  1,646   

714   
390   
271   
80   
16   
66   
    1,537   
109   

14   
(5)  
9   

77   

41   

15   

26   

2   

$ 

24   

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.  

101 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
  
ILLINOIS POWER COMPANY  
BALANCE SHEET  
(In millions)  

ASSETS 

Current Assets: 

Cash and cash equivalents 
Accounts receivable –trade (less allowance for doubtful accounts of $9 and $12,  

respectively) 

Accounts receivable – affiliates 
Unbilled revenue 
Miscellaneous accounts and notes receivable 
Advances to money pool 
Materials and supplies 
Counterparty collateral 
Current regulatory assets 
Other current assets 

Total current assets 
Property and Plant, Net 
Investments and Other Assets: 

Goodwill 
Regulatory assets 
Other assets 

Total investments and other assets 

TOTAL ASSETS 

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Current Liabilities: 

Current maturities of long-term debt 
Accounts and wages payable 
Accounts payable – affiliates 
Taxes accrued 
Customer deposits 
Mark-to-market derivative liabilities 
Mark-to-market derivative liabilities – affiliates 
Environmental remediation 
Current regulatory liabilities 
Other current liabilities 

Total current liabilities 

Long-term Debt, Net 
Deferred Credits and Other Liabilities: 

Accumulated deferred income taxes, net 
Regulatory liabilities 
Pension and other postretirement benefits 
Other deferred credits and liabilities 

Total deferred credits and other liabilities 

Commitments and Contingencies (Notes 2, 14 and 15) 
Stockholders’ Equity: 

Common stock, no par value, 100.0 shares authorized – 23.0 shares outstanding 
Other paid-in-capital 
Preferred stock not subject to mandatory redemption 
Retained earnings 
Accumulated other comprehensive income 

Total stockholders’ equity 

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 

December 31,  

2009  

2008  

$ 

190   

$ 

50   

107   
49   
94   
23   
-   
112   
5   
86   
21   
687   
  2,450   

214   
540   
51   
805   
$  3,942   

$ 

-   
98   
117   
6   
46   
20   
65   
59   
24   
70   
505   
  1,147   

232   
88   
238   
281   
839   

156   
23   
133   
-   
44   
144   
35   
58   
20   
663   
  2,329   

214   
517   
47   
778   
$  3,770   

$  250   
94   
105   
8   
50   
36   
20   
18   
23   
48   
652   
  1,150   

176   
76   
314   
151   
717   

-   
  1,349   
46   
53   
3   
  1,451   
$   3,942   

-   
  1,194   
46   
7   
4   
  1,251   
$  3,770   

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.  

102 

  
 
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
ILLINOIS POWER COMPANY  
CONSOLIDATED STATEMENT OF CASH FLOWS  
(In millions)  

Year Ended December 31,  
  2008    

  2009    

  2007    

Cash Flows From Operating Activities: 

Net income 
Adjustments to reconcile net income to net cash provided by operating 

$ 

79   

$ 

5   

$ 

26   

activities: 
Depreciation and amortization 
Amortization of debt issuance costs and premium/discounts 
Deferred income taxes 
Other 
Changes in assets and liabilities: 

Receivables 
Materials and supplies 
Accounts and wages payable 
Taxes accrued 
Assets, other 
Liabilities, other 
Pension and other postretirement benefits 

Net cash provided by operating activities 
Cash Flows From Investing Activities: 

Capital expenditures 
Advances to AITC for construction 
Money pool advances, net 
Other 

Net cash used in investing activities 
Cash Flows From Financing Activities: 

Dividends on common stock 
Dividends on preferred stock 
Capital issuance costs 
Short-term debt, net 
Money pool borrowings, net 
Redemptions, repurchases, and maturities of long-term debt 
Issuance of long-term debt 
Capital contribution from parent 
IP SPT maturities 
Generator advances received for construction, net 
Overfunding of TFNs 

Net cash provided by (used in) financing activities 
Net change in cash and cash equivalents 
Cash and cash equivalents at beginning of year 
Cash and cash equivalents at end of year 
Cash Paid (Refunded) During the Year: 

Interest (net of $2, $1, and $1 capitalized, respectively) 
Income taxes, net 

Noncash investing activity – asset transfer from AITC 

113   
6   
54   
(2)  

14   
33   
75   
(2)  
28   
11   
-   
        409   

(186)  
(47)  
44   
-   
(189)  

(31)  
(2)  
(7)  
-   
-   
(250)  
-   
155   
-   
55   
-   
(80)  
140   
  50   
190   

96   
22   
26   

$ 

$ 

93   
9   
26   
-   

(26)  
(10)  
70   
1   
(8)  
23   
(5)  
178   

105   
8   
4   
(1)  

(51)  
(12)  
(38)  
-   
(27)  
21   
(5)  
30   

       (186)  
(13)  
(44)  
(3)  
(246)  

       (178) 
(6)  
-   
(2)  
(186)  

(60)  
(2)  
(5)  
(175)  
-   
(337)  
730   
-   
(54)  
15   
-   
112   
44   
6   
50   

75   
(43)  
-   

$ 

$ 

(61)  
(2)  
(2)  
100   
(43)  
-   
250   
-   
(87)  
4   
3   
162   
6   
-   
6   

65   
18   
-   

$ 

$ 

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.  

103 

  
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
 
 
 
  
ILLINOIS POWER COMPANY  
CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY  
(In millions)  

Common Stock 

Other Paid-in Capital: 
Beginning of year 
Capital contribution from parent 

Other paid-in capital, end of year 

Preferred Stock Not Subject to Mandatory Redemption 

Retained Earnings: 
Beginning of year 
Net income 
Common stock dividends 
Preferred stock dividends 

Retained earnings, end of year 

Accumulated Other Comprehensive Income: 

Beginning of year 
Change in deferred retirement benefit costs 

Total accumulated other comprehensive income, end of year 

Total Stockholders’ Equity 
Comprehensive Income, Net of Taxes: 

Net income 
Pension and other postretirement activity, net of income taxes of $-, 

$-, and $-, respectively 

Total Comprehensive Income, Net of Taxes 

2009  

$ 

-   

  1,194   
155   
    1,349   
46   

7   
79   
(31)  
(2)  
53   

4   
(1)  
3   
$  1,451   

$ 

$ 

79   

(1)  
78   

December 31,  
2008  

2007  

$ 

-    

$ 

-   

  1,194    
-    
     1,194    
46    

  1,194   
-   
    1,194   
46   

64    
5    
(60)   
(2)   
7    

4    
-    
4    
$  1,251    

$ 

$ 

5    

-    
5    

101   
26   
(61)  
(2)  
64   

5   
(1)  
4   
$  1,308   

$ 

$ 

26   

(1)  
25   

The accompanying notes as they relate to IP are an integral part of these consolidated financial statements.  

104 

  
 
 
 
 
  
  
  
  
  
  
 
 
 
 
  
  
  
 
 
 
  
  
  
  
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
AMEREN CORPORATION (Consolidated)  
UNION ELECTRIC COMPANY (Consolidated)  
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
AMEREN ENERGY GENERATING COMPANY  
(Consolidated)  
CENTRAL ILLINOIS LIGHT COMPANY (Consolidated)  
ILLINOIS POWER COMPANY (Consolidated)  
COMBINED NOTES TO FINANCIAL STATEMENTS  
December 31, 2009  
NOTE 1 – SUMMARY OF SIGNIFICANT ACCOUNTING  
POLICIES  
General  

Ameren, headquartered in St. Louis, Missouri, is a 

public utility holding company under PUHCA 2005, 
administered by FERC. Ameren’s primary assets are the 
common stock of its subsidiaries. Ameren’s subsidiaries 
are separate, independent legal entities with separate 
businesses, assets, and liabilities. These subsidiaries 
operate, as the case may be, rate-regulated electric 
generation, transmission and distribution businesses, rate-
regulated natural gas transmission and distribution 
businesses, and merchant electric generation businesses 
in Missouri and Illinois. Dividends on Ameren’s common 
stock and the payment of other expenses by Ameren 
depend on distributions made to it by its subsidiaries. 
Ameren’s principal subsidiaries are listed below. Also see 
the Glossary of Terms and Abbreviations at the front of 
this report.  
  UE, or Union Electric Company, also known as 
AmerenUE, operates a rate-regulated electric 
generation, transmission and distribution business, 
and a rate-regulated natural gas transmission and 
distribution business in Missouri. UE was incorporated 
in Missouri in 1922 and is successor to a number of 
companies, the oldest of which was organized in 1881. 
It is the largest electric utility in the state of Missouri. It 
supplies electric and natural gas service to a 24,000-
square-mile area located in central and eastern 
Missouri. This area has an estimated population of 
2.8 million and includes the Greater St. Louis area. UE 
supplies electric service to 1.2 million customers and 
natural gas service to 126,000 customers.  

  CIPS, or Central Illinois Public Service Company, also 
known as AmerenCIPS, operates a rate-regulated 
electric and natural gas transmission and distribution 
business in Illinois. CIPS was incorporated in Illinois in 
1923 and is successor to a number of companies, the 
oldest of which was organized in 1902. It supplies 
electric and natural gas utility service to portions of 
central, west central and southern Illinois having an 
estimated population of 1.1 million in an area of 20,500 
square miles. CIPS supplies electric service to 
383,000 customers and natural gas service to 182,000 
customers.  

  Genco, or Ameren Energy Generating Company, 

operates a merchant electric generation business in 
Illinois and Missouri. Genco was incorporated in Illinois 
in March 2000. Genco’s coal, and natural gas and oil-
fired electric generating facilities, are expected to have 

capacity of 3,454, 1,578, and 169 megawatts, 
respectively, at the time of the 2010 peak summer 
electrical demand.  

 

  CILCO, or Central Illinois Light Company, also known 
as AmerenCILCO, operates a rate-regulated electric 
transmission and distribution business, a merchant 
electric generation business (through its subsidiary 
AERG), and a rate-regulated natural gas transmission 
and distribution business, all in Illinois. CILCO was 
incorporated in Illinois in 1913. It supplies electric and 
natural gas utility service to portions of central and 
east central Illinois in areas of 3,700 and 4,500 square 
miles, respectively, with an estimated population of 
0.6 million. CILCO supplies electric service to 211,000 
customers and natural gas service to 214,000 
customers. AERG, a wholly owned subsidiary of 
CILCO, is expected to have capacity of 1,125 
megawatts from its coal-fired electric generating 
facilities at the time of the 2010 peak summer electrical 
demand.  
IP, or Illinois Power Company, also known as 
AmerenIP, operates a rate-regulated electric and 
natural gas transmission and distribution business in 
Illinois. IP was incorporated in 1923 in Illinois. It 
supplies electric and natural gas utility service to 
portions of central, east central, and southern Illinois, 
serving a population of 1.5 million in an area of 15,000 
square miles, contiguous to our other service 
territories. IP supplies electric service to 617,000 
customers and natural gas service to 417,000 
customers, including most of the Illinois portion of the 
Greater St. Louis area.  
Ameren has various other subsidiaries responsible for 
the short- and long-term marketing of power, procurement 
of fuel, management of commodity risks, and provision of 
other shared services. Ameren has an 80% ownership 
interest in EEI, which until February 29, 2008, was held 
40% by UE and 40% by Development Company. Ameren 
consolidates EEI for financial reporting purposes. UE 
reported EEI under the equity method until February 29, 
2008. Effective February 29, 2008, UE’s and Development 
Company’s ownership interests in EEI were transferred to 
Resources Company through an internal reorganization. 
UE’s interest in EEI was transferred at book value 
indirectly through a dividend to Ameren. On January 1, 
2010, as part of an internal reorganization, Resources 
Company transferred its 80% stock ownership interest in 
EEI to Genco through a capital contribution. See Note 14 
– Related Party Transactions for additional information.  
The following table presents summarized financial 

2009 

information of EEI (in millions):  
For the years ended December 31, 
2007 
Operating revenues ..............................   $  303    $  520    $  427 
Operating income .................................    
216 
Net income ...........................................    
136 
As of December 31, 
  2009      2008      2007 
86    $  76    $ 
Current assets ......................................   $ 
69 
172     
Noncurrent assets .................................    
140     
124 
165     
Current liabilities ...................................    
93     
60 
48     
Noncurrent liabilities ..............................    
43     
10 

226     
142     

19     
10     

2008 

105 

  
 
 
 
 
 
 
 
 
 
 
 
 
The financial statements of Ameren, Genco and 
CILCO are prepared on a consolidated basis. CIPS has 
no subsidiaries and therefore is not consolidated. UE had 
a subsidiary in 2007 (Union Electric Development 
Corporation), but in January 2008 this subsidiary was 
transferred to Ameren in the form of a stock dividend. 
Accordingly, UE’s financial statements were prepared on a 
consolidated basis for 2007 only. IP had a subsidiary in 
2007 (Illinois Gas Supply Company) that was dissolved at 
December 31, 2007. Accordingly, IP’s financial statements 
were prepared on a consolidated basis for 2007 only. All 
significant intercompany transactions have been 
eliminated. All tabular dollar amounts are in millions, 
unless otherwise indicated.  

Our accounting policies conform to GAAP. Our 

financial statements reflect all adjustments (which include 
normal, recurring adjustments) that are necessary, in our 
opinion, for a fair presentation of our results. The 
preparation of financial statements in conformity with 
GAAP requires management to make certain estimates 
and assumptions. Such estimates and assumptions affect 
reported amounts of assets and liabilities, the disclosure 
of contingent assets and liabilities at the dates of financial 
statements, and the reported amounts of revenues and 
expenses during the reported periods. Actual results could 
differ from those estimates.  

Regulation  

Certain Ameren subsidiaries are regulated by the 
MoPSC, the ICC, the NRC, and FERC. In accordance with 
authoritative accounting guidance regarding accounting 
for the effects of certain types of regulation, UE, CIPS, 
CILCO and IP defer certain costs as assets pursuant to 

actions of our rate regulators or the expected ability to 
recover such costs in rates charged to customers. UE, 
CIPS, CILCO and IP also defer certain amounts as 
liabilities pursuant to actions of regulators or the 
expectation that such amounts will be returned to 
customers in future rates. Regulatory assets and liabilities 
are amortized consistent with the period of expected 
regulatory treatment. See Note 2 – Rate and Regulatory 
Matters for additional information on regulatory assets and 
liabilities. Assets are also recorded as construction work in 
progress and property and plant, net. See Note 3 – 
Property and Plant, Net.  

Cash and Cash Equivalents  

Cash and cash equivalents include cash on hand and 
temporary investments purchased with an original maturity 
of three months or less.  

Allowance for Doubtful Accounts Receivable  

The allowance for doubtful accounts represents our 

best estimate of existing accounts receivable that will 
ultimately be uncollectible. The allowance is calculated by 
applying estimated write-off factors to various classes of 
outstanding receivables, including unbilled revenue. The 
write-off factors used to estimate uncollectible accounts 
are based upon consideration of both historical collections 
experience and management’s best estimate of future 
collections success given the existing and anticipated 
future collections environment. See Note 2 – Rate and 
Regulatory Matters for additional information regarding 
regulatory recovery of uncollectible accounts receivable by 
the Ameren Illinois Utilities.

Materials and Supplies  

Materials and supplies are recorded at the lower of cost or market. Cost is determined using the average-cost 
method. Materials and supplies are capitalized as inventory when purchased and then expensed or capitalized as plant 
assets when installed, as appropriate. The following table presents a breakdown of materials and supplies for each of the 
Ameren Companies at December 31, 2009 and 2008:  

CIPS 

$ 

 - 
  32 
15 

$  47 

$ 

- 
54 
16 

Genco 

CILCO 

IP 

$ 

97 
- 
35 

$ 

38 
45 
24 

$    132 

$    107 

$ 

92 
- 
30 

$ 

32 
75 
24 

  $ 

- 
84 
28 
  $    112 

  $ 

- 
117 
27 
  $  144 

$  70 

$  122 

$  131 

2009: 
Fuel(b)  ...................................................................................  
Gas stored underground .......................................................  
Other materials and supplies .................................................   

2008: 
Fuel(b)  ...................................................................................  
Gas stored underground .......................................................  
Other materials and supplies .................................................   

Ameren (a) 

UE 

$   315 
  183 
  284 

$  782 

$  290 
  277 
  275 

$  842 

$   154 
22 
170 

$  346 

$  139 
32 
168 

$  339 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(a) 
(b)  Consists of coal, oil, paint, propane, and tire chips.  

106 

  
  
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Property and Plant  

Goodwill and Intangible Assets  

We capitalize the cost of additions to and betterments 

of units of property and plant. The cost includes labor, 
material, applicable taxes, and overhead. An allowance for 
funds used during construction, as discussed specifically 
below, is also capitalized as a cost of our rate-regulated 
assets. Interest during construction is capitalized as a cost 
of merchant generation assets. Maintenance 
expenditures, including nuclear refueling and maintenance 
outages, are expensed as incurred. When units of 
depreciable property are retired, the original costs, less 
salvage values, are charged to accumulated depreciation. 
Asset removal costs incurred by our merchant generation 
operations that do not constitute legal obligations are 
expensed as incurred. Asset removal costs accrued by 
our rate-regulated operations that do not constitute legal 
obligations are classified as a regulatory liability. See 
Asset Retirement Obligations below and Note 3 – Property 
and Plant, Net, for additional information.  

Depreciation  

Depreciation is provided over the estimated lives of 
the various classes of depreciable property by applying 
composite rates on a straight-line basis to the cost basis 
of such property. The provision for depreciation for the 
Ameren Companies in 2009, 2008 and 2007 generally 
ranged from 3% to 4% of the average depreciable cost.  

Allowance for Funds Used During Construction  

In our rate-regulated operations, we capitalize the 
allowance for funds used during construction, or the cost 
of borrowed funds and the cost of equity funds (preferred 
and common stockholders’ equity) applicable to rate-
regulated construction expenditures, as is the utility 
industry accounting practice. Allowance for funds used 
during construction does not represent a current source of 
cash funds. This accounting practice offsets the effect on 
earnings of the cost of financing current construction, and 
it treats such financing costs in the same manner as 
construction charges for labor and materials.  

Under accepted ratemaking practice, cash recovery of 

allowance for funds used during construction and other 
construction costs occurs when completed projects are 
placed in service and reflected in customer rates. The 
following table presents the annual allowance for funds 
used during construction rates that were utilized during 
2009, 2008, and 2007:  

2009 

Ameren ................................    6% – 10 % 
UE  ......................................   
CIPS ....................................   
CILCO .................................   
IP   ......................................   

6 
6 
10 
9 

2008 
  1% – 7 % 

7 
1 
1 
5 

2007 
6% – 7% 
6   
6   
7   
6   

Goodwill. Goodwill represents the excess of the 
purchase price of an acquisition over the fair value of the  
net assets acquired. Ameren’s goodwill relates to its 
acquisition of IP and an additional 20% EEI ownership 
interest acquired in 2004 as well as its acquisition of 
CILCORP and Medina Valley in 2003. IP’s goodwill relates 
to the acquisition of IP in 2004. See Note 17 – Goodwill for 
additional information.  

Intangible Assets. We evaluate intangible assets for 
impairment if events or changes in circumstances indicate 
that their carrying amount might be impaired. Ameren’s, 
UE’s, Genco’s and CILCO’s intangible assets at 
December 31, 2009 and 2008, consisted of emission 
allowances. See also Note 15 – Commitments and 
Contingencies for additional information on emission 
allowances.  

The following table presents the SO2 and NOx 

emission allowances held and the related aggregate SO2 
and NOx emission allowance book values that were 
carried as intangible assets as of December 31, 2009. 
Emission allowances consist of various individual 
emission allowance certificates and do not expire. 
Emission allowances are charged to fuel expense as they 
are used in operations.  
SO2 and NOX in tons 
Ameren(d)  ...................   
UE  .............................   
Genco .........................   
CILCO (AERG) ...........   
EEI .............................   

Book  Value(c) 
$    129(e) 
35   
34   
1   
5   

(a)  
SO2 
3,028,000    
1,610,000    
743,000    
354,000    
321,000    

(b)  
NO X
25,091   
13,677   
9,258   
210   
1,946   

(a)  Vintages are from 2009 to 2019. Each company possesses additional 

allowances for use in periods beyond 2019.  

(b)  Vintage is 2009.  
(c)  The book value represents SO2 and NOx emission allowances for use in 
periods through 2039. The book value at December 31, 2008, for 
Ameren, UE, Genco, CILCO (AERG), and EEI was $167 million, $48 
million, $49 million, $1 million, and $9 million, respectively.  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
Includes $30 million and $24 million of fair-market value adjustments 
recorded in connection with Ameren’s 2003 acquisition of CILCORP and 
Ameren’s 2004 acquisition of an additional 20% ownership interest in 
EEI, respectively.  
The following table presents amortization expense 

(d) 
(e) 

recorded in connection with the usage of emission 
allowances, net of gains from emission allowance sales, 
for Ameren, UE, Genco and CILCO (AERG) during the 
years ended December 31, 2009, 2008, and 2007:  

Ameren(a)(b)  ...........................  
UE  ........................................  
Genco ....................................  
CILCO (AERG) ......................  

2009 
$   24  
(5) 
  16  
2  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
Includes allowances consumed that were recorded through purchase 
accounting.  
(c)  Less than $1 million.  

2008 
$   28  
(5) 
  25  
(c) 

2007 
$   35  
(5) 
  30  
1  

(a) 
(b) 

107 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Impairment of Long-lived Assets  

We evaluate long-lived assets classified as held and 

used for impairment when events or changes in 
circumstances indicate that the carrying value of such assets 
may not be recoverable. Whether impairment has occurred is 
determined by comparing the estimated undiscounted cash 
flows attributable to the assets with the carrying value of the 
assets. If the carrying value exceeds the undiscounted cash 
flows, we recognize an impairment charge equal to the 
carrying value of the assets in excess of estimated fair value. 
In the period in which we determine an asset meets the held 
for sale criteria, we record an impairment charge to the extent 
the book value exceeds its fair value less cost to sell. In 
2009, Genco recorded asset impairment charges of $6 
million as a result of the termination of a rail line extension 
project at a subsidiary of Genco and to adjust the carrying 
value of an office building owned by Genco to its estimated 
fair value as of December 31, 2009. The charge related to 
the office building was based on the expected net proceeds 
to be generated from its sale in 2010. In addition, CILCO 
recorded an asset impairment charge of $1 million to adjust 
the carrying value of CILCO’s (AERG’s) Indian Trails 
generation facility’s estimated fair value as of December 31, 
2009. This charge was based on the net proceeds generated 
from the sale of the facility in January 2010.  

In 2008, asset impairment charges were recorded to 
adjust the carrying value of CILCO’s (AERG’s) Indian Trails 
and Sterling Avenue generation facilities to their estimated 
fair values as of December 31, 2008. CILCO recorded an 
asset impairment charge of $12 million related to the Indian 
Trails generation facility as a result of the suspension of 
operations by the facility’s only customer. CILCORP recorded 
a $2 million impairment charge related to the Sterling Avenue 
CT. The charge was based on the net proceeds generated 
from the sale of the facility in 2009.  

The 2009 and 2008 asset impairment charges were 
recorded in Operating Expenses – Other Operations and 
Maintenance Expense in the applicable statements of income 
and were included in Merchant Generation segment results.  

Investments  

Ameren and UE evaluate for impairment the investments 

held in UE’s nuclear decommissioning trust fund. Losses on 
assets in the trust fund could result in higher funding 
requirements for decommissioning costs, which UE believes 
would be recovered in electric rates paid by its customers. 
Accordingly, Ameren and UE recognize a regulatory asset on 
their balance sheets for losses on investments held in the 
nuclear decommissioning trust fund. See Note 9 – Nuclear 
Decommissioning Trust Fund Investments for additional 
information.  

Environmental Costs  

Liabilities for environmental costs are recorded on an 
undiscounted basis when it is probable that a liability has 

been incurred and the amount of the liability can be 
reasonably estimated. Estimated environmental expenditures 
are regularly reviewed and updated. Costs are expensed or 
deferred as a regulatory asset when it is expected that the 
costs will be recovered from customers in future rates. If 
environmental expenditures are related to facilities currently 
in use, such as pollution control equipment, the cost is 
capitalized and depreciated over the expected life of the 
asset.  

Unamortized Debt Discount, Premium, and Expense  

Discount, premium, and expense associated with long-

term debt are amortized over the lives of the related issues.  

Revenue  

Operating Revenues  

UE, CIPS, Genco, CILCO and IP record operating 

revenue for electric or natural gas service when it is delivered 
to customers. We accrue an estimate of electric and natural 
gas revenues for service rendered but unbilled at the end of 
each accounting period.  

Trading Activities  

We present the revenues and costs associated with 
certain energy derivative contracts designated as trading on 
a net basis in Operating Revenues – Electric and Other.  

Nuclear Fuel  

UE’s cost of nuclear fuel is amortized to fuel expense on 
a unit-of-production basis. Spent fuel disposal cost is based 
on net kilowatthours generated and sold, and that cost is 
charged to expense.  

Purchased Gas, Power and Fuel Rate-adjustment 
Mechanisms  

Ameren’s utility subsidiaries have various rate-

adjustment mechanisms in place that provide for the recovery 
of purchased natural gas and electric fuel and purchased 
power costs.  

In UE’s, CIPS’, CILCO’s, and IP’s retail natural gas utility 

jurisdictions, changes in natural gas costs are generally 
reflected in billings to their natural gas utility customers 
through PGA clauses. The difference between actual natural 
gas costs and costs billed to customers in a given period are 
deferred and included in Other Current Assets or Other 
Current Liabilities on the balance sheet of Ameren and in 
Current Regulatory Assets or Current Regulatory Liabilities 
on the balance sheet of UE, CIPS, CILCO and IP. The 
deferred amounts are either billed or refunded to natural gas 
utility customers in a subsequent period.  

In the Ameren Illinois Utilities’ retail electric utility 

jurisdictions, changes in purchased power costs are generally 
reflected in billings to their electric utility customers through 
pass-through rate-adjustment clauses.

108 

  
  
The difference between actual purchased power costs and 
costs billed to customers in a given period are deferred and 
included in Other Current Assets or Other Current Liabilities 
on the balance sheet of Ameren and in Current Regulatory 
Assets or Current Regulatory Liabilities on the balance 
sheets of CIPS, CILCO and IP. The deferred amounts are 
either billed or refunded to electric utility customers in a 
subsequent period.  

In 2009, UE implemented a FAC for its retail electric 
jurisdiction. The FAC allows an adjustment of electric rates 
three times per year for a pass-through to customers of 95% 
of changes in fuel and purchased power costs, net of off-
system revenues, including MISO costs and revenues, 
greater or less than the amount set in base rates, subject to 
MoPSC prudency review. The difference between the costs 
of fuel incurred and the cost of fuel recovered from UE’s 
customers are deferred and included in Other Current Assets 
or Other Current Liabilities on the balance sheet of Ameren 
and in Current Regulatory Assets or Current Regulatory 
Liabilities on the balance sheet of UE. The deferred amounts 
are either billed or refunded to UE’s electric utility customers 
in a subsequent period.  

Accounting for MISO Transactions  

MISO-related purchase and sale transactions are 
recorded by Ameren, UE, CIPS, CILCO and IP using 
settlement information provided by MISO. These purchase 
and sale transactions are accounted for on a net hourly 
position. We record net purchases in a single hour in 
Operating Expenses – Purchased Power and net sales in a 
single hour in Operating Revenues – Electric in our 
statements of income. On occasion, prior period transactions 
will be resettled outside the routine settlement process 
because of a change in MISO’s tariff or a material 
interpretation thereof. In these cases, Ameren, UE, CIPS, 
CILCO and IP recognize expenses associated with 
resettlements once the resettlement is probable and the 
resettlement amount can be estimated. Ameren, UE, CIPS, 
CILCO and IP recognize revenues associated with 
resettlements in accordance with authoritative guidance on 
revenue recognition.  

Stock-based Compensation  

Stock-based compensation cost is measured at the grant 

date based on the fair value of the award. Ameren 
recognizes as compensation expense the estimated fair 
value of stock-based compensation on a straight-line basis 
over the requisite service period. See Note 12 – Stock-based 
Compensation for additional information.  

Excise Taxes  

Excise taxes imposed on us are reflected on Missouri 

electric, Missouri natural gas, and Illinois natural gas 
customer bills. They are recorded gross in Operating 
Revenues and Operating Expenses – Taxes Other Than 
Income Taxes on the statement of income. Excise taxes 
reflected on Illinois electric customer bills are imposed on the 
consumer and are therefore not included in revenues and 

expenses. They are recorded as tax collections payable and 
included in Taxes Accrued on the balance sheet. The 
following table presents excise taxes recorded in Operating 
Revenues and Operating Expenses – Taxes Other than 
Income Taxes for the years ended 2009, 2008 and 2007:  

2009 

2008 

2007 

Ameren ......................................................   $  168    $  172    $  166   
UE  ............................................................  
  110   
CIPS ..........................................................  
15   
CILCO .......................................................  
11   
IP   ............................................................  
30   

  112   
15   
11   
30   

  109   
16   
13   
34   

Income Taxes  

Ameren uses an asset and liability approach for its 

financial accounting and reporting of income taxes, in 
accordance with authoritative accounting guidance. Deferred 
tax assets and liabilities are recognized for transactions that 
are treated differently for financial reporting and income tax 
return purposes. These deferred tax assets and liabilities are 
calculated based on statutory tax rates.  

We recognize that regulators will probably reduce future 
revenues for deferred tax liabilities initially recorded at rates 
in excess of the current statutory rate. Therefore, reductions 
in the deferred tax liability, which were recorded because of 
decreases in the statutory rate, were credited to a regulatory 
liability. A regulatory asset has been established to recognize 
the probable future recovery in rates of future income taxes 
resulting principally from the reversal of allowance for funds 
used during construction, that is, equity and temporary 
differences related to property and plant acquired before 
1976 that were unrecognized temporary differences prior to 
the adoption of the authoritative accounting provisions for 
income taxes.  

Investment tax credits used on tax returns for prior years 
have been deferred for book purposes; the credits are being 
amortized over the useful lives of the related investment. 
Deferred income taxes were recorded on the temporary 
difference represented by the deferred investment tax credits 
and a corresponding regulatory liability. This recognizes the 
expected reduction in rate revenue for future lower income 
taxes associated with the amortization of the investment tax 
credits. See Note 13 – Income Taxes.  

UE, CIPS, Genco, CILCO, and IP are parties to a tax 

sharing agreement with Ameren that provides for the 
allocation of consolidated tax liabilities. The tax sharing 
agreement provides that each party is allocated an amount of 
tax similar to that which would be owed had the party been 
separately subject to tax. Any net benefit attributable to the 
parent is reallocated to other members. That allocation is 
treated as a contribution of capital to the party receiving the 
benefit.  

Noncontrolling Interests  

Ameren’s noncontrolling interests comprise the 20% of 

EEI’s net assets not owned by Ameren and the preferred

109 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
stock not subject to mandatory redemption of the Ameren 
subsidiaries. These noncontrolling interests are classified 
as a component of equity separate from Ameren’s equity 
in its consolidated balance sheet.  

Earnings per Share  

There were no material differences between Ameren’s 

basic and diluted earnings per share amounts in 2009, 
2008, and 2007. The number of stock options, restricted 
stock shares, and performance share units outstanding 
was immaterial. The assumed stock option conversions 
increased the number of shares outstanding in the diluted 
earnings per share calculation by 16,841 shares in 2008 
and 35,545 shares in 2007. There were no assumed stock 
option conversions in 2009, as the remaining stock 
options were not dilutive.  

Accounting Changes and Other Matters  

The following is a summary of recently adopted 
authoritative accounting guidance as well as guidance 
issued but not yet adopted that could impact the Ameren 
Companies.  

Noncontrolling Interests in Consolidated Financial 
Statements  

In December 2007, the FASB issued authoritative 

guidance that established accounting and reporting 
standards for minority interests, which were 
recharacterized as noncontrolling interests. This guidance 
requires noncontrolling interests to be classified as a 
component of equity separate from the parent’s equity; 
purchases or sales of equity interests that do not result in 
a change in control to be accounted for as equity 
transactions; net income attributable to the noncontrolling 
interest to be included in consolidated net income in the 
statement of income; and upon a loss of control, the 
interest sold, as well as any interest retained, to be 
recorded at fair value, with any gain or loss recognized in 
earnings. We adopted the provisions of this guidance at 
the beginning of 2009. It applied prospectively, except for 
the presentation and disclosure requirements, for which it 
applied retroactively. See Noncontrolling Interests above 
for additional information.  

Disclosures about Derivative Instruments and Hedging 
Activities  

In March 2008, the FASB issued amended 

authoritative guidance that requires entities to provide 
greater transparency in interim and annual financial 
statements about how and why the entity uses derivative 
instruments, how the instruments and related hedged 
items are accounted for, and how the instruments and 
related hedged items affect the financial position, results 
of operations, and cash flows of the entity. This guidance 
requires qualitative disclosures about objectives and 
strategies for using derivatives, quantitative disclosures 
about fair value amounts of and gains and losses on 
derivative instruments, and disclosures about credit-risk-
related contingent features in derivative agreements. The 
adoption of this guidance, effective for us in the first 

quarter of 2009, did not have a material impact on our 
results of operations, financial position, or liquidity 
because it required enhanced disclosure only. See Note 7 
– Derivative Financial Instruments for additional 
information.  

Employers’ Disclosures about Postretirement Benefit Plan 
Assets  

In December 2008, the FASB issued authoritative 

guidance regarding additional disclosures related to 
pension and other postretirement benefit plan assets. 
Required additional disclosures include those related to 
the investment allocation decision-making process, the fair 
value of each major category of plan assets and the inputs 
and valuation techniques used to measure fair value and 
significant concentrations of risk within the plan assets. 
The adoption of this guidance, effective for us as of 
December 31, 2009, did not have a material impact on our 
results of operations, financial position, or liquidity, 
because it provided enhanced disclosure requirements 
only. See Note 11 – Retirement Benefits for additional 
information.  

Determining Fair Value When the Volume and Level of 
Activity for the Asset or Liability Have Significantly 
Decreased and Identifying Transactions That Are Not 
Orderly  

In April 2009, the FASB issued additional authoritative 
guidance regarding the factors that should be considered 
in estimating fair value when there has been a significant 
decrease in market activity for an asset or liability. The 
guidance, which applies to all fair value measurements, 
does not change the objective of a fair value 
measurement. The adoption of this guidance, effective for 
us as of June 30, 2009, did not have a material impact on 
our results of operations, financial position, or liquidity.  

Recognition and Presentation of Other-Than-Temporary 
Impairments  

In April 2009, the FASB issued authoritative guidance 

that established a new method of recognizing and 
reporting other-than-temporary impairments of debt 
securities. It contains additional annual and interim 
disclosure requirements related to debt and equity 
securities. Under the new guidance, an impairment of debt 
securities is other-than-temporary if (1) the entity intends 
to sell the security, (2) it is more likely than not that the 
entity will be required to sell the security before recovery 
of its amortized cost basis, or (3) the entity does not 
expect to recover the security’s entire amortized cost 
basis. The adoption of this guidance, effective for us as of 
June 30, 2009, did not have a material impact on our 
results of operations, financial position, or liquidity.  

Subsequent Events  

In May 2009, the FASB issued authoritative guidance 
that established general standards of accounting for, and 
disclosure of, events that occur after the balance sheet 
date

110 

but before financial statements are issued or are available 
to be issued. The adoption of this guidance, effective for 
us as of June 30, 2009, did not have a material impact on 
our results of operations, financial position, or liquidity. In 
February 2010, the FASB issued amended guidance 
which was effective upon issuance. The adoption of the 
amended guidance did not have a material impact on our 
results of operations, financial position, or liquidity. 

The FASB Accounting Standards Codification and the 
Hierarchy of Generally Accepted Accounting Principles  

In June 2009, the FASB issued the FASB Accounting 

Standards Codification (the “Codification”), which is the 
primary source of authoritative GAAP to be applied by 
nongovernmental entities. Rules and interpretive releases 
of the SEC under authority of federal securities laws are 
also sources of authoritative GAAP for SEC registrants. 
The Codification modifies the hierarchy of GAAP to 
include only two levels: authoritative and nonauthoritative. 
The Codification supersedes all non-SEC accounting and 
reporting standards. The adoption of the Codification, 
effective for us as of July 1, 2009, did not affect our results 
of operations, financial position, or liquidity.  

Variable-Interest Entities  

In June 2009, the FASB issued amended authoritative 
guidance that significantly changes the consolidation rules 
for VIEs. The guidance requires an enterprise to 
qualitatively assess the determination of the primary 
beneficiary of a VIE based on whether the entity (1) has 
the power to direct matters that most significantly affect 
the activities of the VIE, and (2) has the obligation to 
absorb losses or the right to receive benefits of the VIE 
that could potentially be significant to the VIE. Further, the 
guidance requires an ongoing reconsideration of the 
primary beneficiary. It also amends the events that trigger 
a reassessment of whether an entity is a VIE. The 
adoption of this guidance, effective for us as of January 1, 
2010, did not have a material impact on our results of 
operations, financial position, or liquidity.  

Disclosures about Fair Value Measurements  

In January 2010, the FASB issued amended 

authoritative guidance regarding fair value measurements. 
This guidance requires disclosures regarding significant 
transfers into and out of Level 1 and Level 2 fair value 
measurements. It also requires information on purchases, 
sales, issuances, and settlements on a gross basis in the 
reconciliation of Level 3 fair value measurements. Further, 
the FASB clarified guidance regarding the level of 
disaggregation, inputs, and valuation techniques. This 
guidance was effective for us in the first quarter of 2010, 
with the exception of guidance applicable to detailed Level 
3 reconciliation disclosures, which will be effective for us 
in the first quarter of 2011. The adoption of this guidance 
will not have a material impact on our results of 
operations, financial position, or liquidity because it 
provides enhanced disclosure requirements only.  

Asset Retirement Obligations  

Authoritative accounting guidance requires us to 

record the estimated fair value of legal obligations 
associated with the retirement of tangible long-lived assets 
in the period in which the liabilities are incurred and to 
capitalize a corresponding amount as part of the book 
value of the related long-lived asset. In subsequent 
periods, we are required to make adjustments to AROs 
based on changes in the estimated fair values of the 
obligations. Corresponding increases in asset book values 
are depreciated over the remaining useful life of the 
related asset. Uncertainties as to the probability, timing, or 
amount of cash flows associated with AROs affect our 
estimates of fair value. Ameren, UE, Genco and CILCO 
have recorded AROs for retirement costs associated with 
UE’s Callaway nuclear plant decommissioning costs, 
asbestos removal, ash ponds, and river structures. In 
addition, Ameren, UE, CIPS, and IP have recorded AROs 
for the disposal of certain transformers.  

Asset removal costs accrued by our rate-regulated 

operations that do not constitute legal obligations are 
classified as a regulatory liability. See Note 2 – Rate and 
Regulatory Matters. 

The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the years 2009 

and 2008:  

Balance at December 31, 2007 ...............................................................................  
Liabilities settled ................................................................................................  
Accretion in 2008(f) ............................................................................................  
Change in estimates(g) .......................................................................................  
Balance at December 31, 2008 ...............................................................................  
Liabilities incurred..............................................................................................  
Liabilities settled ................................................................................................  
Accretion in 2009(f) ............................................................................................  
Change in estimates(h) .......................................................................................  
Balance at December 31, 2009 ...............................................................................  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
decommissioning of the Callaway nuclear plant.  

111 

Ameren (a)(b)(c) 
$  567  
(3) 
33  
(186) 
$  411  
(e) 
$ 
(3) 
24  
2  
$  434  

UE (b) 
$  476  
(e) 
27  
  (186) 
$  317  
-  
$ 
(2) 
18  
(2) 
$  331  

CIPS (d)  Genco (c) 
$  2   
-   
(e ) 
-   
$  2   
-   
$ 
-   
(e ) 
(e ) 
$  2   

$  52  
(1) 
3  
(e) 
$  54  
-  
$ 
(e) 
4  
(e) 
$   58  

CILCO 
$  28  
(2) 
2  
(e) 
$  28  
$  (e) 
(e) 
2  
4  
$  34  

IP (d) 
$  2   
  (e ) 
  (e ) 
-   
$  2   
$  -   
-   
  (e ) 
  (e ) 
$  2   

(a) 
(b)  The nuclear decommissioning trust fund assets of $293 million and $239 million as of December 31, 2009 and 2008, respectively, were restricted for 

  
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
(c)  Balance included $5 million in Other Current Liabilities on the balance sheet.  
(d)  Balance included in Other Deferred Credits and Liabilities on the balance sheet.  
(e)  Less than $1 million.  
(f)  All accretion expense was recorded as an increase to regulatory assets, except for Genco and CILCO (AERG).  
(g)  UE changed estimates related to its Callaway nuclear plant decommissioning costs based on a cost study performed in 2008, a change in assumptions 

related to plant life, and a decline in the cost escalation factor assumptions.  

(h)  UE and CILCO changed estimates for asbestos removal. Additionally, CILCO changed related estimates to retirement costs for its ash ponds.  

Variable-Interest Entities  

According to authoritative accounting guidance 
regarding variable-interest entities (VIEs), an entity is 
considered a VIE if it does not have sufficient equity to 
finance its activities without assistance from variable-
interest holders, or if its equity investors lack any of the 
following characteristics of a controlling financial interest: 
control through voting rights, the obligation to absorb 
expected losses, or the right to receive expected residual 
returns. Ameren and its subsidiaries review their equity 
interests, debt obligations, leases, contracts, and other 
agreements to determine their relationship to a VIE. We 
have determined that the following significant VIEs were 
held by the Ameren Companies at December 31, 2009:  
Affordable housing partnership investments. At 

December 31, 2009 and 2008, Ameren had investments in 
multiple affordable housing and low-income real estate 
development partnerships as well as an investment in a 
commercial real estate development partnership of 
$64 million and $82 million in the aggregate, respectively. 
For these variable-interests, Ameren is a limited partner. It 
owns less than a 50 percent interest and receives the 
benefits and accepts the risks consistent with its limited 
partner interest. We have concluded that Ameren is not 
the primary beneficiary of any of the VIEs related to these 
investments because Ameren would not absorb a majority 
of the entity’s losses. These investments are classified as 
Other Assets on Ameren’s consolidated balance sheet. 
The maximum exposure to loss as a result of these 
variable interests is limited to the investments in these 
arrangements.  

Coal Contract Settlement  

In June 2008, Genco entered into a settlement 
agreement with a coal mine owner. The owner provided 
Genco with a lump-sum payment of $60 million in July 
2008 because of the coal supplier’s premature closing of a 
mine and the early termination of a coal supply contract. 
The settlement agreement compensated Genco, in total, 
for higher fuel costs it incurred in 2008 ($33 million) and in 
2009 ($27 million) as a result of the mine closure and 
contract termination.  

Employee Separation and Other Charges  

In the third quarter of 2009, Ameren initiated a 
voluntary separation program that provided eligible 
management employees the opportunity to voluntarily 
terminate their employment and receive benefits 
consistent with Ameren’s standard management 
severance program. This program was offered to eligible 
management employees at Ameren’s subsidiaries, 
including UE, CIPS, Genco, CILCO and IP. Additionally, in 

November 2009, Ameren initiated an involuntary 
separation program to reduce additional management 
positions under terms and benefits consistent with 
Ameren’s standard management severance 
program. Ameren recorded a pretax charge to earnings of 
$17 million in 2009 (UE – $8 million, CIPS – $1 million, 
Genco – $5 million, CILCO – $2 million, and IP – $1 
million) for the severance costs related to both the 
voluntary and involuntary separation programs as well as 
for Merchant Generation staff reductions announced in the 
third quarter of 2009. These charges were recorded in 
other operations and maintenance expense in the 
applicable statements of income. Substantially all of this 
amount was paid prior to December 31, 2009. The 
number of positions eliminated as a result of these 
separation programs, including the Merchant Generation 
staff reductions, was approximately 300. In addition to 
these programs, Genco recorded a $4 million pretax 
charge to earnings in 2009 in connection with the 
retirement of two generating units at its Meredosia power 
plant and for related obsolete inventory.  

NOTE 2 – RATE AND REGULATORY MATTERS  
Below is a summary of significant regulatory 
proceedings and related lawsuits. We are unable to 
predict the ultimate outcome of these matters, the timing 
of the final decisions of the various agencies and courts, 
or the impact on our results of operations, financial 
position, or liquidity.  

Missouri  
2009 Electric Rate Order  

In January 2009, the MoPSC issued an order 
approving an increase for UE in annual revenues of 
approximately $162 million for electric service and the 
implementation of a FAC and a vegetation management 
and infrastructure inspection cost tracking mechanism, 
among other things. The rate changes necessary to 
implement the provisions of the MoPSC order were 
effective March 1, 2009. In February 2009, Noranda, UE’s 
largest electric customer, and the Missouri Office of Public 
Counsel appealed certain aspects of the MoPSC decision 
to the Circuit Court of Pemiscot County, Missouri, the 
Circuit Court of Stoddard County, Missouri, and the Circuit 
Court of Cole County, Missouri. In September 2009, the 
Circuit Court of Pemiscot County granted Noranda’s 
request to stay the electric rate increase granted by the 
January 2009 MoPSC order as it applies specifically to 
Noranda’s electric service account until the court renders 
its decision on the appeal. The merits of the appeal 
continue to be briefed by the parties. A decision is likely to 
be issued by the Circuit

112 

  
  
Court of Pemiscot County in the second quarter of 2010. 
During the stay, Noranda will pay into the court registry 
the contested portion of its monthly billings, approximately 
$0.5 million per month based on current usage levels. If 
UE wins the appeal, it will receive those monthly 
payments plus interest.  

Pending Electric Rate Case  

UE filed a request with the MoPSC in July 2009 to 

increase its annual revenues for electric service by 
$402 million. Included in this increase request was 
approximately $227 million of anticipated increases in 
normalized net fuel costs in excess of the net fuel costs 
included in base rates previously authorized by the 
MoPSC in its January 2009 electric rate order, which, 
absent initiation of this general rate proceeding, would 
have been eligible for recovery through UE’s existing FAC. 
The balance of the increase request is based primarily on 
investments made to continue systemwide reliability 
improvements for customers, increases in costs essential 
to generating and delivering electricity, and higher 
financing costs. The initial electric rate increase request 
was based on an 11.5% return on equity, a capital 
structure composed of 47.4% equity, a rate base for UE of 
$6.0 billion, and a test year ended March 31, 2009, with 
certain pro-forma adjustments through the anticipated 
true-up date of January 31, 2010. In February 2010, UE 
filed rebuttal testimony relating to certain positions taken 
by interveners in the rate case and modified its 
recommended return on equity to 10.8%.  

UE’s initial filing included a request for interim rate 
relief, which would have placed into effect approximately 
$37 million of the requested increase prior to completion 
of the full rate case. In January 2010, the MoPSC denied 
UE’s request for interim rate relief.  

As part of its filing, UE also requested that the MoPSC 

approve the implementation of an environmental cost 
recovery mechanism and a storm restoration cost tracker. 
The environmental cost recovery mechanism, if approved, 
would allow UE to adjust electric rates twice each year 
outside of general rate proceedings to reflect changes in 
its prudently incurred costs to comply with federal, state, 
or local environmental laws, regulations, or rules greater 
than or less than the amount set in base rates. Rate 
adjustments pursuant to this cost recovery mechanism 
would not be permitted to exceed an annual amount equal 
to 2.5% of UE’s gross jurisdictional electric revenues and 
would be subject to prudency reviews by the MoPSC. 
UE’s request was consistent with the environmental cost 
recovery rules approved by the MoPSC in April 2009. The 
storm restoration cost tracker would permit UE a more 
timely recovery of storm restoration operations and 
maintenance expenditures.  

In addition, UE requested that the MoPSC approve 

the continued use of the FAC and the vegetation 
management and infrastructure inspection cost tracking 
mechanism that the MoPSC previously authorized in its 
January 2009 electric rate order, and the continued use of 
the regulatory tracking mechanism for pension and 

postretirement benefit costs that the MoPSC previously 
authorized in its May 2007 electric rate order. The UE 
request included the discontinuation of the SO2 emission 
allowance sales tracker.  

UE’s filing with the MoPSC also seeks approval to 

revise the tariff under which it serves Noranda to 
prospectively address the significant lost revenues UE can 
incur due to any future operational issues at Noranda’s 
smelter plant in southeastern Missouri, such as the 
revenue losses resulting from the January 2009 storm-
related power outage.  

The MoPSC staff has responded to the UE request for 

an electric service rate increase. The MoPSC staff has 
recommended an increase to UE’s annual revenues of 
between $218 million to $251 million based on a return on 
equity range of 9.0% to 9.7%. Included in this 
recommendation was approximately $214 million of 
increases in normalized net fuel costs. Other parties also 
made recommendations through testimony filed in this 
case. MoPSC staff and other parties have expressed 
opposition to some of the requested cost recovery 
mechanisms as well as the proposed Noranda tariff 
revision.  

The MoPSC proceeding relating to the proposed 
electric service rate changes will take place over a period 
of up to 11 months, and a decision by the MoPSC in such 
proceeding is required by the end of June 2010. Hearings 
are scheduled in March 2010. UE cannot predict the level 
of any electric service rate change the MoPSC may 
approve, when any rate change may go into effect, 
whether the cost recovery mechanisms and trackers 
requested will be approved or continued, or whether any 
rate change that may eventually be approved will be 
sufficient to enable UE to recover its costs and earn a 
reasonable return on its investments when the rate 
change goes into effect.  

Renewable Energy Portfolio Requirement  

A ballot initiative passed by Missouri voters in 
November 2008 created a renewable energy portfolio 
requirement. UE and other Missouri investor-owned 
utilities will be required to purchase or generate electricity 
from renewable energy sources equaling at least 2% of 
native load sales by 2011, with that percentage increasing 
in subsequent years to at least 15% by 2021, subject to a 
1% limit on customer rate impacts. At least 2% of each 
portfolio requirement must be derived from solar energy. 
Compliance with the renewable energy portfolio 
requirement can be achieved through the procurement of 
renewable energy or renewable energy credits. Rules 
implementing the renewable energy portfolio requirement 
are expected to be issued by the MoPSC in 2010. UE 
expects that any related costs or investments would 
ultimately be recovered in rates. In January 2010, UE 
issued an RFP to solicit solar renewable energy credits 
and energy in 2011 to meet the solar portion of this 
requirement. UE is currently evaluating the responses.  

113 

  
Missouri Energy Efficiency Investment Act  

In July 2009, the Missouri governor signed a law that 
went into effect in August 2009, which, among other things, 
allows electric utilities to recover costs related to MoPSC-
approved energy efficiency programs. Recovery is permitted 
only if the program is approved by the MoPSC, results in 
energy savings, and is beneficial to all customers in the class 
for which the program is proposed. The new law could 
potentially, among other things, allow UE to earn a return on 
its energy efficiency programs equivalent to the return UE 
could earn with supply-side capital investments, such as new 
power plants.  

Illinois  

2008 Electric and Natural Gas Delivery Service Rate Order  

On September 24, 2008, the ICC issued a consolidated 

order approving a net increase in annual revenues for electric 
delivery service of $123 million in the aggregate (CIPS – $22 
million increase, CILCO – $3 million decrease, and IP – $104 
million increase) and a net increase in annual revenues for 
natural gas delivery service of $38 million in the aggregate 
(CIPS – $7 million increase, CILCO – $9 million decrease, 
and IP – $40 million increase), based on a 10.65% return on 
equity with respect to electric delivery service and a 10.68% 
return on equity with respect to natural gas delivery service. 
These rate changes were effective on October 1, 2008.  

In October 2008, CIPS, CILCO and IP and other parties 

requested that the ICC rehear certain aspects of its 
September 2008 consolidated order. In November 2008, the 
ICC denied all rate order rehearing requests filed by the 
Ameren Illinois Utilities and other parties. In December 2008, 
the Illinois attorney general appealed the rate order to the 
Appellate Court of Illinois, Fourth District, specifically, the 
ICC’s affirmation of the recovery of a certain amount of fixed 
costs in the customer charge. In December 2009, the 
Appellate Court denied the Illinois attorney general’s appeal 
and sustained the ICC rate order.  

Pending Electric and Natural Gas Delivery Service Rate 
Cases  

In June 2009, CIPS, CILCO and IP filed requests with 
the ICC to increase their annual revenues for electric delivery 
service. The currently pending requests, as amended, seek 
to increase annual revenues from electric delivery service by 
$115 million in the aggregate (CIPS – $38 million, CILCO – 
$17 million, and IP – $60 million). Additionally, the Ameren 
Illinois Utilities requested moving more of the electric delivery 
costs into the monthly non-volumetric charge, similar to the 
natural gas delivery rate design change approved by the ICC 
in 2008. The electric rate increase requests were based on 
an 11.3% to 11.7% return on equity, a capital structure 
composed of 44% to 49% equity, an aggregate rate base for 
the Ameren Illinois Utilities of $2.3 billion, and a test year 
ended December 31, 2008, with certain known and 
measurable adjustments through May 2010.  

CIPS, CILCO and IP also filed requests with the ICC in 
June 2009 to increase their annual revenues for natural gas 
delivery service. The currently pending requests, as 
amended, seek to increase annual revenues for natural gas 
delivery service by $15 million in the aggregate (CIPS – 
$6 million, CILCO – $2 million, and IP – $7 million). The 
natural gas rate increase requests were based on a 10.8% to 
11.2% return on equity, a capital structure composed of 44% 
to 49% equity, an aggregate rate base for the Ameren Illinois 
Utilities of $1.0 billion, and a test year ended December 31, 
2008, with certain known and measurable adjustments 
through May 2010.  

The ICC staff has responded to the filed requests by the 
Ameren Illinois Utilities. The ICC staff has recommended, as 
amended, a net increase in revenues for electric delivery 
service for the Ameren Illinois Utilities of $57 million in the 
aggregate (CIPS – $21 million increase, CILCO – $5 million 
increase, and IP – $31 million increase) and a net decrease 
in revenues for natural gas delivery service of $11 million in 
the aggregate (CILCO – $6 million decrease and IP – $5 
million decrease). The ICC staff position was based on a 
10.1% to 10.4% return on equity for electric delivery service 
and a 9.4% to 9.6% return on equity for natural gas delivery 
service. Other parties also made recommendations through 
testimony filed in the electric and natural gas delivery service 
rate cases.  

In February 2010, administrative law judges issued a 

consolidated proposed order, which included a 
recommended revenue increase for electric delivery service 
for the Ameren Illinois Utilities of $66 million in the aggregate 
(CIPS – $26 million increase, CILCO – $6 million increase, 
and IP – $34 million increase) and a recommended revenue 
net decrease for natural gas delivery service of $10 million in 
the aggregate (CIPS – $1 million increase, CILCO – $ 6 
million decrease, and IP – $5 million decrease). The ICC is 
not bound by the proposed order issued by the administrative 
law judges.  

The ICC proceedings relating to the proposed electric 
and natural gas delivery service rate changes will take place 
over a period of up to 11 months, and decisions by the ICC in 
such proceedings are required by May 2010. The Ameren 
Illinois Utilities cannot predict the level of any delivery service 
rate changes the ICC may approve, when any rate changes 
may go into effect, or whether any rate changes that may 
eventually be approved will be sufficient to enable the 
Ameren Illinois Utilities to recover their costs and earn a 
reasonable return on their investments when the rate 
changes go into effect. 

2007 Illinois Electric Settlement Agreement  

In 2007, key stakeholders in Illinois agreed to avoid rate 

rollback and freeze legislation that would impose a tax on 
electric generation. These stakeholders wanted to address 
the increase in electric rates and the future power 
procurement process in Illinois. The terms of the agreement 
included a comprehensive rate relief and customer 
assistance program. The 2007 Illinois Electric Settlement 
Agreement provided approximately $1 billion of funding 

114 

  
 
   
from 2007 to 2010 for rate relief for certain electric customers 
in Illinois, including approximately $488 million for customers 
of the Ameren Illinois Utilities. Pursuant to the 2007 Illinois 
Electric Settlement Agreement, the Ameren Illinois Utilities, 
Genco, and CILCO (AERG) agreed to make aggregate 
contributions of $150 million over the four-year period, with 
$60 million coming from the Ameren Illinois Utilities (CIPS – 
$21 million; CILCO – $11 million; IP – $28 million), $62 
million from Genco, and $28 million from CILCO (AERG). 
See Note 15 –Commitments and Contingencies for 
information on the remaining contributions to be made as of 
December 31, 2009.  

The Ameren Illinois Utilities, Genco, and CILCO (AERG) 

recognize in their financial statements the costs of their 
respective rate relief contributions and program funding 
under the 2007 Illinois Electric Settlement Agreement in a 
manner corresponding with the timing of the funding. As a 
result, Ameren, CIPS, CILCO (Illinois Regulated), IP, Genco, 
and CILCO (AERG) incurred charges to earnings, primarily 
recorded as a reduction to electric operating revenues, during 
the year ended December 31, 2009, of $25 million, $3 million, 
$2 million, $5 million, $10 million, and $5 million, respectively 
(year ended December 31, 2008 – $42 million, $6 million, $3 
million, $8 million, $17 million, and $8 million, respectively) 
under the terms of the 2007 Illinois Electric Settlement 
Agreement.  

Other electric generators and utilities in Illinois agreed to 

contribute $851 million to the comprehensive rate relief and 
customer assistance program. Contributions by the other 
electric generators (the generators) and utilities to the 
comprehensive program are subject to funding agreements. 
Under these agreements, at the end of each month, the 
Ameren Illinois Utilities send a bill, due in 30 days, to the 
generators and utilities for their proportionate share of that 
month’s rate relief and assistance. If any escrow funds have 
been provided by the generators, these funds will be drawn 
upon before reimbursement is sought from the generators. At 
December 31, 2009, Ameren, CIPS, CILCO (Illinois 
Regulated) and IP had receivable balances from nonaffiliated 
Illinois generators for reimbursement of customer rate relief 
and program funding of $10 million, $3 million, $2 million, and 
$5 million, respectively. See Note 14 – Related Party 
Transactions for information on the impact of intercompany 
settlements.  

The 2007 Illinois Electric Settlement Agreement provided 

that if before August 1, 2011, legislation is enacted in Illinois 
freezing or reducing retail electric rates, or imposing or 
authorizing a new tax, special assessment, or fee on the 
generation of electricity, then the remaining commitments 
under the 2007 Illinois Electric Settlement Agreement would 
expire, and any funds set aside in support of the 
commitments would be refunded to the utilities and 
Generators.  

Power Procurement  

As part of the 2007 Illinois Electric Settlement 

Agreement, the reverse auction used for power procurement 
in Illinois was discontinued. However, one-third of the existing 
supply contracts from the September 2006 reverse power 
procurement auction remain in place through May 2010. A 
new competitive power procurement process led by the IPA, 
which was established as a part of the 2007 Illinois Electric 
Settlement Agreement, was implemented beginning in 
January 2009. In January 2009, the ICC approved the 
electric power procurement plan filed by the IPA for both the 
Ameren Illinois Utilities and Commonwealth Edison 
Company. The plan outlined the wholesale products that the 
IPA procured on behalf of the Ameren Illinois Utilities for the 
period June 1, 2009, through May 31, 2014. The IPA 
procured capacity, energy swaps, and renewable energy 
credits through an RFP process on behalf of the Ameren 
Illinois Utilities in the second quarter of 2009. See Note 14 – 
Related Party Transactions and Note 15 – Commitments and 
Contingencies for additional information about the Ameren 
Illinois Utilities’ purchased power agreements.  

In December 2009, the ICC approved a plan for 

procurement of electric power for the Ameren Illinois Utilities 
and Commonwealth Edison Company for the period June 1, 
2010, through May 31, 2015. The IPA will procure energy 
swaps, capacity and renewable energy credits and long-term 
renewable supply. The exact dates of each procurement 
event have not been determined. Following successful 
completion of the proposed 2010 procurement events, the 
Ameren Illinois Utilities will have sufficient capacity and 
energy hedges in place for 100% of their expected supply 
obligation for the period June 2010 through May 2011, 70% 
of their expected supply obligation for the period June 2011 
through May 2012, and 44% of their expected supply 
obligations for the period June 2012 through May 2013. The 
Ameren Illinois Utilities will also have sufficient renewable 
energy credits to satisfy the 2010 planning year requirement 
along with 20-year renewable supply contracts consisting of 
600,000 megawatthours per year of renewable energy power 
and credits with deliveries beginning June 1, 2012.  

Also as part of the 2007 Illinois Electric Settlement 
Agreement, the Ameren Illinois Utilities entered into financial 
contracts with Marketing Company (for the benefit of Genco 
and AERG), to lock in energy prices for 400 to 1,000 
megawatts annually of their round-the-clock power 
requirements during the period June 1, 2008, to 
December 31, 2012, at relevant market prices. See Note 7 – 
Derivative Financial Instruments and Note 14 – Related Party 
Transactions for additional information on these financial 
contracts.  

ICC Reliability Audit  

In August 2007, the ICC retained Liberty Consulting 
Group to investigate, analyze, and report to the ICC on the 
Ameren Illinois Utilities’ transmission and distribution systems 
and reliability following the July 2006 wind storms and a 
November 2006 ice storm. In October 2008, Liberty 
Consulting Group presented the ICC with a final report 
containing recommendations for the Ameren Illinois Utilities 
to improve their systems and their response to emergencies. 
The ICC directed the Ameren Illinois Utilities to present to the 
ICC a plan to implement Liberty Consulting Group’s

115 

recommendations. The plan was submitted to the ICC in 
November 2008. Liberty Consulting Group will monitor the 
Ameren Illinois Utilities’ efforts to implement the 
recommendations and any initiatives that the Ameren Illinois 
Utilities undertake. The Ameren Illinois Utilities expect they 
could incur an estimated $20 million ($15 million for 
distribution and $5 million for transmission) of capital costs 
and an estimated $66 million ($50 million for distribution and 
$16 million for transmission) of cumulative operations and 
maintenance expenses for the 2010 through 2013 time frame 
in order to implement the recommendations.  

In December 2009, the Ameren Illinois Utilities requested 

ICC approval of a rider mechanism to recover the 
distribution-related costs associated with the Liberty 
Consulting Group’s recommendations. This request replaced 
a previous request for a rider mechanism, which had been 
part of the pending electric delivery rate cases. There is no 
statutory date by which the ICC must act, and no schedule is 
currently in place for this request.  

The Ameren Illinois Utilities have committed to 
implement various audit recommendations, as outlined in 
their November 2008 plan. However, in order to fulfill that 
commitment in a timely manner, they must be able to 
synchronize the timing of their distribution-implementation 
expenditures with the recognition of those costs in rates. 
Without the necessary funding or a rider mechanism to 
recover the distribution costs, the Ameren Illinois Utilities may 
defer some of the projects until the distribution costs can be 
recovered either in base rates or through some other cost 
recovery mechanism.  

Transmission-related costs, as incurred, will be 
recoverable through FERC’s ratemaking proceedings.  

Illinois 2009 Energy Legislation  

In July 2009, a new law became effective in Illinois that, 

among other things, established new energy efficiency 
targets for Illinois natural gas utilities, developed a 
percentage of income payment plan for low-income utility 
customers, and allowed electric and natural gas utilities to 
recover through a rate adjustment the difference between 
their actual bad debt expense and the bad debt expense 
included in their base rates. In February 2010, the ICC 
approved the Ameren Illinois Utilities’ electric and natural gas 
rate adjustment tariffs to recover bad debt expense not 
recovered in base rates. The tariffs provide utilities the ability 
to adjust their base rates annually through a rate adjustment 
mechanism that applies to 2008 and subsequent years. Upon 
ICC approval of the rate adjustment tariffs in February 2010, 
the Ameren Illinois Utilities made a one-time $10 million 
donation (CIPS – $2 million, CILCO – $2 million, and IP – $6 
million) for customer assistance programs, as required by the 
legislation. The amount of the required one-time donation 
and the impact of the net recovery of 2008 and 2009 bad 
debt expenses were reflected in 2009 earnings.  

Federal  

Regional Transmission Organization  

UE, CIPS, CILCO and IP are transmission-owning 

members of MISO, which is a FERC-regulated RTO that 
provides transmission tariff administration services for electric 
transmission systems. In early 2004, UE received 
authorization from the MoPSC to participate in MISO for a 
five-year period, with further participation subject to approval 
by the MoPSC. The MoPSC required UE to file a study 
evaluating the costs and benefits of its participation in MISO 
prior to the end of the five-year period. The MoPSC also 
directed UE to enter into a service agreement with MISO to 
provide transmission service to UE’s bundled retail 
customers. The service agreement’s primary function was to 
ensure that the MoPSC continued to set the transmission 
component of UE’s rates to serve its bundled retail 
load. Among other things, the service agreement provided 
that UE would not pay MISO for transmission service to UE’s 
bundled retail customers. FERC approved the service 
agreement in the form that was acceptable to the MoPSC.  

Due to changes to MISO’s allocation of transmission 
revenues to transmission owners, UE believed it should have 
received incremental annual transmission revenues of $60 
million as of February 2008 in accordance with its service 
agreement with MISO. Numerous transmission owners in 
MISO, along with MISO itself as the tariff administrator, 
filed with FERC in December 2007 requesting changes to the 
MISO tariff to prevent UE from collecting these additional 
transmission revenues. In December 2007, UE filed a protest 
to these proposed MISO tariff changes, calling them 
unauthorized and improper in light of the MoPSC’s 
requirement for the service agreement between UE and 
MISO discussed above. In February 2008, FERC issued an 
order accepting the tariff changes proposed by MISO and by 
certain transmission owners in MISO. In March 2008, UE 
filed a request with FERC for a rehearing of its order. In April 
2008, FERC suspended UE’s request for rehearing to allow 
time for further consideration by FERC. UE is unable to 
predict if or when FERC may issue a further order in this 
proceeding.  

As required by the MoPSC, UE filed a study in November 

2007 with the MoPSC evaluating the costs and benefits of 
UE’s participation in MISO. UE’s filing noted a number of 
uncertainties associated with the cost-benefit study, including 
issues associated with the UE-MISO service agreement and 
MISO revenue allocation, as discussed above. In June 2008, 
a stipulation and agreement among UE, the MoPSC staff, 
MISO and other parties to the proceeding was filed with the 
MoPSC, which provided for UE’s continued, conditional 
MISO participation through April 30, 2012. The stipulation 
and agreement gives UE the right to seek permission from 
the MoPSC for early withdrawal from MISO if UE determines 
that sufficient progress toward mitigating some of the 
continuing uncertainties respecting its MISO participation is 
not being made. The MoPSC issued an order, effective 
September 19, 2008, approving the stipulation and 
agreement. If UE were to withdraw from MISO in the future, it 
might need to

116 

  
  
obtain FERC approval and to meet conditions imposed by 
FERC, in addition to obtaining MoPSC’s approval.  

Seams Elimination Cost Adjustment  

Pursuant to a series of FERC orders, FERC put Seams 
Elimination Cost Adjustment (SECA) charges into effect on 
December 1, 2004, subject to refund and hearing 
procedures. The SECA charges were a transition mechanism 
in place for 16 months, from December 1, 2004, to March 31, 
2006, to compensate transmission owners in MISO and PJM 
for revenues lost when FERC eliminated the regional 
through-and-out rates previously applicable to transactions 
crossing the border between MISO and PJM. The SECA 
charge was a nonbypassable surcharge payable by load-
serving entities in proportion to the benefit they realized from 
the elimination of the regional through-and-out rates as of 
December 1, 2004. The MISO transmission owners 
(including UE, CIPS, CILCO and IP) and the PJM 
transmission owners filed their proposed SECA charges in 
November 2004, as compliance filings pursuant to FERC 
order. A FERC administrative law judge issued an initial 
decision in August 2006, recommending that FERC reject 
both of the SECA compliance filings (the filing for SECA 
charges made by the transmission owners in the MISO and 
the filing for SECA charges made by the transmission owners 
in PJM). Several parties filed rehearing requests of this initial 
decision. There is no date scheduled for FERC to act on the 
initial decision. Both before and after the initial decision, 
various parties (including UE, CIPS, CILCO and IP as part of 
the group of MISO transmission owners) filed numerous 
bilateral or multiparty settlements. To date, FERC has 
approved many of the settlements and has rejected none of 
the settlements. Neither the MISO transmission owners, 
including UE, CIPS, CILCO and IP, nor the PJM transmission 
owners have been able to settle with all parties. During the 
transition period of December 1, 2004, to March 31, 2006, 
Ameren, UE, CIPS, and IP received net revenues from the 
SECA charges of $10 million, $3 million, $1 million, and $6 
million, respectively. CILCO’s net SECA charges were less 
than $1 million. In December 2009, a party that has not 
settled its SECA charges filed with the U.S. Court of Appeals 
for the District of Columbia Circuit seeking an order directing 
the FERC to resolve the SECA matters. In response to this 
filing, in January 2010, FERC agreed to issue an order on the 
SECA initial decision and rehearing requests by the end of 
May 2010. While we cannot predict the ultimate outcome of 
the SECA proceedings, we do not believe the outcome of the 
proceedings will have a material effect on UE’s, CIPS’, 
CILCO’s and IP’s costs and revenues.  

FERC Order – MISO Charges  

In May 2007, UE, CIPS, CILCO and IP filed with the U.S. 

Court of Appeals for the District of Columbia Circuit an 
appeal of FERC’s March 2007 order involving the reallocation 
of certain MISO operational costs among MISO participants 
retroactive to 2005. In August 2007, the court granted 
FERC’s motion to hold the appeal in abeyance until the end 
of the continuing proceedings at FERC regarding these 

costs. Other MISO participants also filed appeals. On 
August 10, 2007, UE, CIPS, CILCO, and IP filed a complaint 
with FERC regarding the MISO tariff’s allocation methodology 
for these same MISO operational charges. In November 
2007, FERC issued two orders relative to these allocation 
matters. One of these orders addressed requests for 
rehearing of prior orders in the proceedings, and one 
concerned MISO’s compliance with FERC’s orders to date in 
the proceedings. In December 2007, UE, CIPS, CILCO and 
IP requested FERC’s clarification or rehearing of its 
November 2007 order regarding MISO’s compliance with 
FERC’s orders. UE, CIPS, CILCO and IP maintained that 
MISO was required to reallocate certain of MISO’s 
operational costs among MISO market participants, which 
would result in refunds to UE, CIPS, CILCO and IP 
retroactive to April 2006. On November 7, 2008, FERC 
issued an order granting the request for clarification. FERC 
directed MISO to reallocate certain MISO operational costs 
among MISO participants and provide refunds for the period 
April 2006 to August 2007 (“November 7, 2008 Clarification 
Order”). On November 10, 2008, FERC granted further relief 
requested in the complaints filed by UE, CIPS, CILCO, IP 
and others regarding further reallocation for these MISO 
operational charges and directed MISO to calculate refunds 
for the period from August 10, 2007, forward (“November 10, 
2008 Complaint Order”).  

Several parties to these proceedings protested MISO’s 

proposed implementation of these refunds, requested 
rehearing of FERC’s orders and, in some cases, appealed 
FERC’s orders to the courts. In March 2009, MISO began 
resettling its markets to provide refunds as FERC directed 
retroactive from August 10, 2007. In May 2009, FERC issued 
an order that upheld most of the conclusions of the 
November 10, 2008 Complaint Order but changed the 
effective date for refunds such that certain operational costs 
will be allocated among MISO market participants beginning 
November 10, 2008, instead of August 10, 2007. In June 
2009, UE, CIPS, CILCO and IP filed for rehearing of the May 
2009 order regarding the change to the refund effective date. 
This rehearing request is pending.  

With respect to the November 7, 2008 Clarification 
Order, in June 2009 FERC issued an order dismissing 
rehearing requests of such clarification order and waiving 
refunds of amounts billed that were included in the MISO 
charge, under the assumption that there was a rate mismatch 
for the period April 25, 2006, through November 4, 2007. UE, 
CIPS, CILCO and IP filed a request for rehearing in July 
2009. This rehearing request is pending.  

With respect to the two rehearing requests discussed 

above, UE, CIPS, CILCO and IP do not believe that the 
ultimate resolution of either request will have a material effect 
on their results of operations, financial position, or liquidity.  

MISO and PJM Dispute Resolution  

During 2009, MISO and PJM discovered an error in the 

calculation quantifying certain transactions between the

117 

  
  
RTOs. The error, which originated in April 2005, at the 
initiation of the MISO Energy and Operating Reserves Market 
was corrected prospectively in June 2009. Since discovering 
the error, MISO and PJM have worked jointly to estimate its 
financial impact on the respective markets. MISO and PJM 
are in agreement about the methodology used to recalculate 
the market flows occurring from June 2007 to June 2009 for 
the resettlement due from PJM to MISO estimated at $65 
million. MISO and PJM are not in agreement about the 
methodology used to recalculate the market flows occurring 
from April 2005 to May 2007, nor are they in agreement 
about the resettlement amount. To resolve this issue, MISO 
and PJM have agreed to participate in FERC’s dispute 
resolution and settlement process in order to determine a 
resettlement amount for the entire period from April 2005 to 
June 2009. In October 2009, an administrative law judge was 
appointed as mediator, and multiple settlement conferences 
were held at FERC in late 2009 and early 2010. A final 
settlement between MISO and PJM, if and when reached, will 
probably require filings to be made by PJM and MISO with 
FERC. Ameren and its subsidiaries may receive a to-be-
determined portion of the resettlement amount due from PJM 
to MISO. No prospective refund has been recorded related to 
this matter. Until a settlement has been reached and 
approved by FERC, we cannot predict the ultimate impact of 
these proceedings on Ameren’s, UE’s, CIPS’, Genco’s, 
CILCORP’s, CILCO’s and IP’s results of operations, financial 
position, or liquidity.  

UE Power Purchase Agreement with Entergy Arkansas, Inc.  

In July 2007, FERC issued a series of orders addressing 
a complaint filed by the Louisiana Public Service Commission 
(LPSC) against Entergy Arkansas, Inc. (Entergy) and certain 
of its affiliates. The complaint alleged unjust and 
unreasonable cost allocations. As a result of the FERC 
orders, Entergy began billing UE for additional charges under 
a 165-megawatt power purchase agreement, and UE paid 
these charges. Additional charges continued during the 
remainder of the term of the power purchase agreement, 
which expired on August 31, 2009. Although UE was not a 
party to the FERC proceedings that gave rise to these 
additional charges, UE has intervened in related FERC 
proceedings. UE also filed a complaint with FERC against 
Entergy and Entergy Services, Inc. in April 2008 to challenge 
the additional charges. In September 2008, the presiding 
FERC administrative law judge issued an initial decision 
finding that Entergy’s allocation of such additional charges to 
UE was just and reasonable. In January 2010, FERC issued 
an opinion reversing the administrative law judge’s initial 
decision and ruling that Entergy may not pass additional 
charges to UE. In February 2010, Entergy filed a request for 
rehearing of the January 2010 opinion. UE has recorded the 
additional charges related to the July 2007 order, but has not 
recorded any prospective refund. UE is unable to predict how 
or when the FERC will rule on the motions. Therefore, UE is 
unable to predict whether FERC ultimately will order Entergy 
to refund to UE the additional charges.  

Additionally, LPSC appealed FERC’s orders regarding 
LPSC’s complaint against Entergy Services, Inc. to the U.S. 
Court of Appeals for the District of Columbia. In April 2008, 
that court ordered further FERC proceedings regarding the 
LPSC complaint. The court ordered FERC to explain its 
previous denial of retroactive refunds and the implementation 
of prospective charges. FERC’s decision on remand of the 
retroactive impact of these issues could have a financial 
impact on UE. UE is unable to predict how FERC will 
respond to the court’s decisions. UE estimates that it could 
incur an additional expense of up to $25 million if FERC 
orders retroactive application for the years 2001 to 2005, 
although FERC’s ruling in January 2010, discussed above, 
assuming it is upheld after any rehearings or appeals, likely 
will prevent FERC from ordering UE to pay any amounts 
retroactively. Based on existing facts and circumstances, UE 
believes that the likelihood of incurring this $25 million 
expense is not probable. Thus no liability has been recorded 
as of December 31, 2009. UE plans to participate in any 
proceeding that FERC initiates to address the court’s 
decisions.  

Nuclear Combined Construction and Operating License 
Application  

In July 2008, UE filed an application with the NRC for a 

combined construction and operating license for a new 
1,600-megawatt nuclear unit at UE’s existing Callaway 
County, Missouri, nuclear plant site. UE also signed contracts 
for COLA-related services and certain long lead-time nuclear-
unit related equipment (heavy forgings).  

In early 2009, the Missouri Clean and Renewable Energy 

Construction Act was separately introduced in both the 
Missouri Senate and House of Representatives. One purpose 
of these bills was to allow the MoPSC to authorize utilities to 
recover the costs of financing and tax payments associated 
with a new generating plant while that plant is being 
constructed. Recovery of actual construction costs still would 
not begin until a plant goes into service. UE believes 
legislation allowing timely recovery of financing costs during 
construction must be enacted in order for it to build a new 
nuclear unit to meet its baseload generation capacity needs. 
However, passage of this or other legislation was not a 
commitment or guarantee that UE would build a new nuclear 
unit.  

In April 2009, senior management of UE announced that 
they had asked the legislative sponsors of the Missouri Clean 
and Renewable Energy Construction Act to withdraw the bills 
from consideration by the Missouri General Assembly. UE 
believed that the legislation being considered in the Missouri 
Senate in its then proposed form would not provide UE with 
the financial and regulatory certainty it needed to pursue the 
project. As a result, UE announced that it was suspending its 
efforts to build a new nuclear unit at its existing Missouri 
nuclear plant site. In June 2009, UE requested the NRC 
suspend review of the COLA and all activities related to the 
COLA. The contract for COLA-related services was amended 
in December 2009 in several respects, including changes to 
the termination provisions in  

118 

  
  
light of UE’s decision to suspend its efforts to build a new 
nuclear unit. UE will consider all available and feasible 
generation options to meet future customer requirements 
as part of an integrated resource plan that UE will file with 
the MoPSC in 2011.  

As of December 31, 2009, UE had capitalized 

approximately $69 million as construction work in progress 
related to the COLA. The incurred costs will remain 
capitalized while management assesses all options to 
maximize the value of its investment in this project. If all 
efforts are permanently abandoned or management 
concludes it is probable the cost incurred will be 
disallowed in rates, it is possible that a charge to earnings 
could be recognized in a future period.  

Prior to June 30, 2009, UE made contractual 
payments to the heavy forgings manufacturer of $14 

Regulatory Assets and Liabilities  

million and had remaining contractual commitments of $81 
million. In July 2009, when an agreement was reached 
with the heavy forgings manufacturer to terminate the 
heavy forgings procurement agreement, $5 million in 
previous payments was retained by the manufacturer as a 
penalty for terminating the contract. That amount was 
charged to earnings in June 2009.  

Pumped-storage Hydroelectric Facility Relicensing  

In June 2008, UE filed a relicensing application with 

FERC to operate its Taum Sauk pumped-storage 
hydroelectric facility for another 40 years. The current 
FERC license expires on June 30, 2010. Approval and 
relicensure are expected in 2012. Operations are 
permitted to continue under the current license while the 
application for relicensing is pending. 

In accordance with authoritative accounting guidance regarding accounting for the effects of certain types of 

regulation, UE, CIPS, CILCO and IP defer certain costs pursuant to actions of regulators or based on the expected ability 
to recover such costs in rates charged to customers. UE, CIPS, CILCO and IP also defer certain amounts pursuant to 
actions of regulators or based on the expectation that such amounts will be returned to customers in future rates. The 
following table presents our regulatory assets and regulatory liabilities at December 31, 2009 and 2008:  

2009: 
Current regulatory assets: 

Under-recovered FAC(b)(c) .....................................................................  
Under-recovered Illinois electric power costs(b)(d)...................................  
Under-recovered PGA(b)(d) ....................................................................  
MTM derivative assets(e) .......................................................................  
Total current regulatory assets(f) .................................................................  
Noncurrent regulatory assets: 

Pension and postretirement benefit costs(g)...........................................  
Income taxes(h) .....................................................................................  
Asset retirement obligation(i) .................................................................  
Callaway costs(b)(j) ................................................................................  
Unamortized loss on reacquired debt(b)(k) ..............................................  
Recoverable costs – contaminated facilities(l) ........................................  
IP integration(m) ....................................................................................  
Recoverable costs – debt fair value adjustment(n) .................................  
MTM derivatives assets(o) .....................................................................  
SO2 emission allowances sale tracker(p) ...............................................  
FERC-ordered MISO resettlements – March 2007(q) .............................  
Vegetation management and infrastructure inspection(r) ........................  
Storm costs(s) .......................................................................................  
Demand-side costs(t) ............................................................................  
Reserve for workers’ compensation liabilities(u) .....................................  
Bad debt rider(v) ....................................................................................  
Other(w)  ................................................................................................  
Total noncurrent regulatory assets .............................................................  
Current regulatory liabilities: 

Over-recovered FAC(x) ..........................................................................  
Over-recovered Illinois electric power costs(d) .......................................  
Over-recovered PGA(d) .........................................................................  
MTM derivative liabilities(y) ....................................................................  
Total current regulatory liabilities(z) .............................................................  

Ameren (a) 

UE 

CIPS 

CILCO 

IP 

$  39 
- 
- 
24 
$  63 

$  288 
272 
31 
55 
26 
- 
- 
- 
10 
16 
7 
7 
27 
15 
9 
- 
2 
$   765 

$  10 
- 
4 
11 
$  25 

$ 

$ 

 -   
2   
4   
53   
59   

$ 

75   
5   
2   
-   
5   
47   
-   
-   
103   
-   
-   
-   
-   
-   
3   
7   
1   
$    248   

$ 

$ 

 -   
7   
2   
1   
10   

$ 

$ 

 -   
2   
-   
27   
29   

$ 

93   
1   
1   
-   
5   
-   
-   
-   
57   
-   
-   
-   
-   
-   
-   
4   
1   
$    162   

$ 

$ 

 -   
17   
4   
2   
23   

$ 

$ 

 - 
1 
- 
85 
86 

$  203 
2 
2 
- 
20 
103 
17 
6 
164 
- 
- 
- 
- 
- 
3 
19 
1 
$    540 

$ 

$ 

 - 
20 
3 
1 
24 

$ 

39 
5 
4 
62 
$  110 

$  659 
280 
36 
55 
56 
150 
17 
6 
49 
16 
7 
7 
27 
15 
15 
30 
5 
$  1,430 

$ 

$ 

10 
44 
13 
15 
82 

119 

  
  
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Noncurrent regulatory liabilities: 

Income taxes(aa)....................................................................................  
Removal costs(bb) .................................................................................  
Emission allowances(cc) ........................................................................  
Vegetation management and infrastructure inspection(dd)  .....................  
MTM derivative liabilities(ee) ..................................................................   
Bad debt rider(ff) ....................................................................................  
Pension and postretirement benefit costs tracker(gg) ..............................  
Total noncurrent regulatory liabilities ..........................................................  
2008: 
Current regulatory assets: 

Under-recovered Illinois electric power costs(b)(d)...................................  
Under-recovered PGA(b)(d) ....................................................................  
MTM derivative assets(e) .......................................................................  
Total current regulatory assets(f) .................................................................  
Noncurrent regulatory assets: 

Pension and postretirement benefit costs(g)...........................................  
Income taxes(h) .....................................................................................  
Asset retirement obligation(i) .................................................................  
Callaway costs(b)(j) ................................................................................  
Unamortized loss on reacquired debt(b)(k) ..............................................  
Recoverable costs – contaminated facilities(l) ........................................  
IP integration(m) ....................................................................................  
Recoverable costs – debt fair value adjustment(n) .................................  
MTM derivative assets(o) .......................................................................  
SO2 emission allowances sale tracker(p) ...............................................  
FERC-ordered MISO resettlements - March 2007(q) ..............................  
Vegetation management and infrastructure inspection(r)  .......................  
Storm costs(s) .......................................................................................  
Demand-side costs(t) ............................................................................  
Reserve for workers’ compensation liabilities(u) .....................................  
Other(w)  ................................................................................................  
Total noncurrent regulatory assets .............................................................  
Current regulatory liabilities: 

Over-recovered Illinois electric power costs(d) .......................................  
Over-recovered PGA(d) .........................................................................  
Total current regulatory liabilities(z) .............................................................  
Noncurrent regulatory liabilities: 

Income taxes(aa)....................................................................................  
Removal costs(bb) .................................................................................  
Emission allowances(cc) ........................................................................  
Pension and postretirement benefit costs tracker(gg) ..............................  
MISO resettlements(hh)..........................................................................   
Total noncurrent regulatory liabilities ..........................................................  

Ameren (a) 

UE 

CIPS 

CILCO 

IP 

160 
$ 
  1,084 
35 
2 
14 
2 
41 
$  1,338 

$ 

$ 

2 
1 
79 
82 

$ 

936 
255 
65 
58 
63 
97 
33 
10 
39 
13 
12 
9 
33 
4 
15 
11 
$  1,653 

$ 

$ 

22 
42 
64 

180 
$ 
  1,018 
47 
41 
5 
$   1,291 

$  141 
716 
35 
2 
12 
- 
41 
$  947 

$ 

$ 

 - 
- 
10 
10 

$  410 
248 
60 
58 
30 
- 
- 
- 
6 
13 
12 
9 
33 
4 
9 
5 
$  897 

$ 

$ 

 - 
2 
2 

$  154 
675 
47 
41 
5 
$    922 

$ 

10 
231 
- 
- 
- 
1 
- 
$  242 

$ 

$ 

1 
1 
30 
32 

$  107 
6 
2 
- 
5 
18 
- 
- 
52 
- 
- 
- 
- 
- 
3 
2 
$  195 

$ 

$ 

6 
14 
20 

$ 

14 
220 
- 
- 
- 
$    234 

$ 

9 
199 
- 
- 
1 
- 
- 
$  209 

$ 

$ 

 - 
- 
24 
24 

$  125 
- 
1 
- 
5 
8 
- 
- 
30 
- 
- 
- 
- 
- 
- 
2 
$  171 

$ 

$ 

$ 

$ 

10 
9 
19 

12 
194 
- 
- 
- 
 206 

$ 

$ 

$ 

$ 

 - 
86 
- 
- 
1 
1 
- 
88 

1 
- 
57 
58 

$  294 
1 
2 
- 
23 
71 
33 
10 
78 
- 
- 
- 
- 
- 
3 
2 
$    517 

$ 

$ 

$ 

$ 

6 
17 
23 

 - 
76 
- 
- 
- 
76 

Includes intercompany eliminations.  

(a) 
(b)  These assets earn a return.  
(c)  Under-recovered fuel costs for the accumulation periods from June 2009 through September 2009 and October 2009 through December 2009. Recovery of 

the earlier accumulation period will begin in February 2010 while the recovery of the later accumulation period will begin in June 2010.  

(d)  Costs under- or over-recovered from utility customers. Amounts will be recovered from, or refunded to, customers within one year of the deferral.  
(e)  Current portion of deferral of commodity-related derivative MTM losses, as well as the current portion of the MTM losses on financial contracts entered into 
by the Ameren Illinois Utilities with Marketing Company. See Illinois – Power Procurement Plan discussion above for additional information.  
Included in Current Regulatory Assets on the balance sheet of UE, CIPS, CILCO and IP and in Other Current Assets on the balance sheet of Ameren.  
(f) 
(g)  These costs are being amortized in proportion to the recognition of prior service costs (credits), transition obligations (assets), and actuarial losses (gains) 
attributable to Ameren’s pension plan and postretirement benefit plans. See Note 11 – Retirement Benefits for additional information.  

(h)  Offset to certain deferred tax liabilities for expected recovery of future income taxes when paid. See Note 13 – Income Taxes for amortization period.  

120 

 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
(l) 

(i)  Recoverable costs for AROs at our rate-regulated operations, including net realized and unrealized gains and losses related to the nuclear decommissioning 

(k)  Losses related to reacquired debt. These amounts are being amortized over the lives of the related new debt issuances or the remaining lives of the old debt 

trust fund investments. See Note 1 – Summary of Significant Accounting Policies – Asset Retirement Obligations.  
(j)  UE’s Callaway nuclear plant operations and maintenance expenses, property taxes, and carrying costs incurred between the plant in-service date and the 
date the plant was reflected in rates. These costs are being amortized over the remaining life of the plant’s current operating license through 2024.  
issuances if no new debt was issued.  
The recoverable portion of accrued environmental site liabilities, primarily collected from electric and natural gas customers through ICC-approved cost 
recovery riders in Illinois. The period of recovery will depend on the timing of actual expenditures. See Note 15 – Commitments and Contingencies for 
additional information.  
IP, these costs are recoverable in rates through 2010.  
the related debt, beginning with the expiration of the electric rate freeze in Illinois on January 1, 2007.  
Marketing Company. See Illinois – Power Procurement Plan discussion above for additional information.  

(o)  Deferral of commodity-related derivative MTM losses, as well as the MTM losses on financial contracts entered into by the Ameren Illinois Utilities with 

(m)  Reorganization costs related to the integration and restructuring of IP into the Ameren system. Pursuant to the ICC order approving Ameren’s acquisition of 

(n)  A portion of IP’s unamortized debt fair value adjustment recorded upon Ameren’s acquisition of IP. This portion is being amortized over the remaining life of 

(p)  A regulatory tracking mechanism for gains on sales of SO2 emission allowances, net of SO2 premiums incurred under the terms of coal procurement 

contracts, plus any SO2 discounts received under such contracts, as approved in a MoPSC order. In its pending rate case, UE requested the discontinuation 
of this tracker.  

(q)  Costs associated with a March 2007 FERC order that resettled costs among MISO market participants. The costs were previously charged to expense but 

were recorded as a regulatory asset. They will be amortized over a two-year period beginning March 1, 2009, as approved by the January 2009 MoPSC 
electric rate order.  

(r)  A regulatory tracking mechanism for the difference between the level of vegetation management and infrastructure inspection costs incurred by UE and the 
level of such costs built into electric rates. UE’s vegetation management and infrastructure inspection costs from January 1, 2008, through February 28, 
2009, exceeded the amount allowed in base rates. The excess costs incurred between January 1, 2008, through September 30, 2008, are being amortized 
over three years, beginning on March 1, 2009, as approved by the January 2009 MoPSC electric rate order. The amortization period for the excess costs 
incurred from October 1, 2008, through February 28, 2009, will be determined in UE’s pending electric rate case.  

(s)  Actual storm costs in a test year that exceed the MoPSC staff’s normalized storm costs for rate purposes. The 2006 storm costs are being amortized over 

five years, beginning on June 4, 2007. The 2008 storm costs are being amortized over five years, beginning on March 1, 2009. In addition, the balance 
includes January 2007 ice storm costs that UE will recover as a result of a MoPSC accounting order issued in April 2008. These costs will be amortized over 
five years, beginning on March 1, 2009, as approved by the January 2009 MoPSC electric rate order.  
costs are being amortized over ten years, beginning on March 1, 2009, as approved by the January 2009 MoPSC electric rate order.  

(t)  Demand-side costs, including the costs of developing, implementing and evaluating customer energy efficiency and demand response programs. These 

(u)  Reserve for workers’ compensation claims.  
(v)  A regulatory tracking mechanism for the difference between the level of bad debt expense incurred by the Ameren Illinois Utilities and the level of such costs 
built into electric and natural gas rates. The under-recovery relating to 2008 will be recovered from customers from March 2010 through December 2010. The 
under-recovery relating to 2009 will be recovered from customers from June 2010 through May 2011.  
Includes costs related to the Ameren Illinois Utilities’ November 2007 electric and natural gas delivery service rate cases. The costs associated with the 
Ameren Illinois Utilities’ electric delivery service rate cases are being amortized over a three-year period; the costs associated with the Ameren Illinois 
Utilities’ natural gas delivery service rate cases are being amortized over a five-year period, as approved in the 2008 ICC rate order. In addition, the balance 
includes funding for low-income weatherization and other miscellaneous items.  
through September 2010.  
Included in Current Regulatory Liabilities on the balance sheet of IP and in Other Current Liabilities on the balance sheets of Ameren, UE, CIPS and CILCO.  

(y)  Current portion of deferral of commodity-related derivative MTM gains.  
(z) 
(aa)  Unamortized portion of investment tax credit and federal excess deferred taxes. See Note 13 – Income Taxes for amortization period.  
(bb)  Estimated funds collected for the eventual dismantling and removal of plant from service, net of salvage value, upon retirement related to our rate-regulated 

(x)  Over-recovered fuel costs for the accumulation period from March 2009 through May 2009. Customer refunds began in October 2009 and will continue 

(w) 

operations. See discussion in Note 1 – Summary of Significant Accounting Policies – Asset Retirement Obligations.  

(cc)  The deferral of gains on emission allowance vintage swaps UE entered into during 2005. This gain will be amortized through February 2011.  
(dd)  A regulatory tracking mechanism for the difference between the level of vegetation management and infrastructure inspection costs incurred by UE and the 
level of such costs built into electric rates. This over-recovery relates to the period March 1, 2009, through December 31, 2009. The amortization period for 
this over-recovery will be determined in a future UE electric rate case.  

(ee)  Deferral of commodity-related derivative MTM gains.  
(ff)  A regulatory tracking mechanism for the difference between the level of bad debt expense incurred by the Ameren Illinois Utilities and the level of such costs 

(gg)  A regulatory tracking mechanism for the difference between the level of pension and postretirement benefit costs incurred by UE under GAAP and the level 

built into electric and natural gas rates. The over-recovery relating to 2009 will be refunded to customers June 2010 through May 2011.  
of such costs built into electric rates effective June 4, 2007, as approved in a MoPSC order.  
Charges discussion above for additional information.  

(hh)  A portion of UE’s expected refund relating to MISO resettlements associated with the November 2008 FERC orders. See Federal – FERC Order – MISO 

UE, CIPS, CILCO and IP continually assess the recoverability of their regulatory assets. Under current accounting 
standards, regulatory assets are written off to earnings when it is no longer probable that such amounts will be recovered 
through future revenues. To the extent that payments of regulatory liabilities are no longer probable, the amounts are 
credited to earnings.  

121 

  
NOTE 3 – PROPERTY AND PLANT, NET  

The following table presents property and plant, net, for each of the Ameren Companies at December 31, 2009 and 

2008:  

2009: 
Property and plant, at original cost: 

Electric .............................................................  
Gas ..................................................................  
Other ................................................................  

Less: Accumulated depreciation and  

amortization .....................................................  

Construction work in progress: 

Nuclear fuel in process .....................................  
Other ................................................................  
Property and plant, net ...........................................  
2008: 
Property and plant, at original cost: 

Electric .............................................................  
Gas ..................................................................  
Other ................................................................  

Less: Accumulated depreciation and  

amortization .....................................................  

Construction work in progress: 

Ameren (a)(b) 

UE(b)  

CIPS 

Genco 

$  22,486   
1,583   
406   
  24,475   
8,787   
  15,688   

271   
1,651   
$   17,610   

$  21,244   
1,505   
381   
  23,130   
8,499   
  14,631   

$  13,627  
363  
85  
  14,075  
5,760  
8,315  

271  
999  
$  9,585  

$  13,214  
347  
76  
  13,637  
5,539  
8,098  

$   1,796  
374  
6  
  2,176  
923  
  1,253  

-  
15  
$  1,268  

$  1,744  
365  
6  
  2,115  
915  
  1,200  

$   2,730  
-  
6  
  2,736  
  1,032  
  1,704  

-  
431  
$  2,135  

$  2,451  
-  
6  
  2,457  
  1,013  
  1,444  

CILCO 
(Illinois 
Regulated) 

$ 

987 
520 
3 
  1,510 

730 
780 

- 
12 
792 

954 
506 
3 
1,463 

721 
742 

- 
12 
754 

$ 

$ 

$ 

CILCO 
(AERG) 

$   1,251  
-  
2  
  1,253  
295  
958  

-  
39  
997  

948  
-  
2  
950  
329  
621  

-  
359  
980  

$ 

$ 

$ 

IP 

$  1,966 
603 
21 
  2,590 

176 
  2,414 

- 
36 
$  2,450 

$  1,840 
565 
21 
  2,426 

152 
  2,274 

- 
55 
$  2,329 

Nuclear fuel in process .....................................  
Other ................................................................  
Property and plant, net ...........................................  

-  
506  
$  1,950  
Includes amounts for Ameren registrant and nonregistrant subsidiaries as well as intercompany eliminations.  

190   
1,746   
$  16,567   

190  
707  
$  8,995  

-  
12  
$  1,212  

(a) 
(b)  Amounts in Ameren and UE include two electric generation CTs under two separate capital lease agreements with a gross asset value of $226 million and 

$222 million at December 31, 2009 and 2008, respectively. The total accumulated depreciation associated with the two CTs was $41 million and $36 million 
at December 31, 2009 and 2008, respectively.  
The following table provides accrued capital expenditures at December 31, 2009, 2008, and 2007, which represent 

noncash investing activity excluded from the statements of cash flows:  

2009 ........................................................................................................................  
2008 ........................................................................................................................  
2007 ........................................................................................................................  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(a) 

NOTE 4 – CREDIT FACILITY BORROWINGS AND LIQUIDITY  

Ameren (a) 
$   143 
  213 
  153 

UE 
$  86   
   110   
  76   

CIPS 
$   7 
  3 
  3 

Genco 
$  23 
  41 
  28 

CILCO 
$  6 
   45 
  35 

IP 
$  18 
  14 
7 

The liquidity needs of the Ameren Companies are typically supported through the use of available cash, short-term 

intercompany borrowings, or drawings under committed bank credit facilities.  

122 

  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table summarizes the borrowing activity and relevant interest rates under the $1.15 billion credit facility 

described below for the years ended December 31, 2009 and 2008, respectively, and excludes letters of credit issued 
under the credit facility:  

2009 Multiyear Credit Agreement ($1.15 billion)(a) 
2009: 
Average daily borrowings outstanding during 2009 ....................................................   
Outstanding credit facility borrowings at period end ...................................................  
Weighted-average interest rate during 2009 ..............................................................  
Peak credit facility borrowings during 2009(b) .............................................................  
Peak interest rate during 2009 ..................................................................................   
Prior $1.15 Billion Credit Facility 
2008: 
Average daily borrowings outstanding during 2008 ....................................................  
Outstanding credit facility borrowings at period end ...................................................  
Weighted-average interest rate during 2008 ..............................................................  
Peak credit facility borrowings during 2008 ................................................................  
Peak interest rate during 2008 ..................................................................................   

Ameren 
(Parent) 

$  307   
646   
  2.15% 
$  699   
 5.50% 

$  389   
275   
  3.58% 
$  675   
  7.25% 

UE 

$  266   
-   
  1.72% 
$  457   
 5.50% 

$  154   
251   
  3.25% 
$  493   
  5.65% 

Genco 

$ 

54   
-   
  2.70% 
$  133   
 3.56% 

$ 

41   
-   
  3.97% 
$  150   
  5.53% 

Total 

$ 

$ 

627   
646   
2.02% 
940   
5.50% 

$ 

584   
526   
3.52% 
$    1,068   
7.25% 

(a)  The 2009 Multiyear Credit Agreement amended and restated the Prior $1.15 Billion Credit Facility. Therefore, information in this table includes borrowing 

(b)  The timing of peak credit facility borrowings varies by company. Therefore, the amounts presented by company might not equal the total peak credit facility 

activity under the Prior $1.15 Billion Credit Facility.  
borrowings for the period. The simultaneous peak credit facility borrowings under all credit facilities during 2009 were $1 billion.  
The following table summarizes the borrowing activity and relevant interest rates under the $150 million Supplemental 

Agreement described below for the year ended December 31, 2009:  

Supplemental Agreement ($150 million) 
2009: 
Average daily borrowings outstanding during 2009 ........................................................  
Outstanding credit facility borrowings at period end ....................................................... 
Weighted-average interest rate during 2009 .................................................................. 
Peak credit facility borrowings during 2009(a) ................................................................. 
Peak interest rate during 2009 ......................................................................................  
(a)  The timing of peak credit facility borrowings varies by company and therefore the amounts presented by company might not equal the total peak credit facility 

74   
84   
  3.56% 
$  109   
 5.50% 

42  
84  
 3.58% 
91  
$ 
  5.50% 

12  
-  
3.52% 
17  
 3.56% 

20  
-  
3.62% 
53  
 5.50% 

borrowings for the period. The simultaneous peak credit facility borrowings under all credit facilities during 2009 were $1 billion.  
The following table summarizes the borrowing activity and relevant interest rates under the $800 million 2009 Illinois 

Genco 

Total 

UE 

$ 

$ 

$ 

$ 

$ 

$ 

Ameren 
(Parent) 

Credit Agreement described below for the year ended December 31, 2009:  

2009 Illinois Credit Agreement ($800 million) 
2009: 
Average daily borrowings outstanding during 2009 .....................................   
Outstanding credit facility borrowings at period end ....................................  
Weighted-average interest rate during 2009 ...............................................  
Peak credit facility borrowings during 2009(a) ..............................................  
Peak interest rate during 2009 ...................................................................   

Ameren 
(Parent) 

$  68  
  100  
  3.54% 
$  200  
   3.56% 

CIPS 

$    - 
- 
- 
$   - 
- 

CILCO 
(Parent) 

$    - 
- 
- 
 - 
- 

$ 

IP 

$    - 
- 
- 
$   - 
- 

Total 

$ 

68   
100   
3.54% 
$  200   
 3.56% 

(a)  The timing of peak credit facility borrowings varies by company. Therefore, the amounts presented by company may not equal the total peak credit facility 

borrowings for the period. The simultaneous peak credit facility borrowings under all credit facilities during 2009 were $1 billion.  

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The following table summarizes the borrowing activity and relevant interest rates under the 2007 $500 million credit 

facility, which was terminated during 2009, for the years ended December 31, 2009 and 2008:  

2007 $500 Million Credit Facility (Terminated) 
2009: 
Average daily borrowings outstanding during 2009( b)  ..............................  
Outstanding credit facility borrowings at period end ..................................  
Weighted-average interest rate during 2009( b)  ........................................  
Peak credit facility borrowings during 2009(b) (c) ........................................  
Peak interest rate during 2009( b)  .............................................................  
2008: 
Average daily borrowings outstanding during 2008 ...................................  
Outstanding credit facility borrowings at period end ..................................  
Weighted-average interest rate during 2008 .............................................  
Peak credit facility borrowings during 2008 ...............................................  
Peak interest rate during 2008 .................................................................   

CIPS 

$    - 
- 
- 
- 
- 

$ 

$ 

$ 

- 
- 
- 
- 
- 

CILCO 
(Parent) 

$ 

$ 

 -   
-   
-   
 -   
-   

$ 

56   
-   
  4.02% 
75   
$ 
  6.47% 

IP 

 -   
-   
-   
 -   
-   

$ 

$ 

$  133   
-   
4.28% 
$  200   
6.15% 

AERG 

$ 

59   
-   
1.42% 
$  100   
3.25% 

$ 

95   
85   
3.95% 
$  150   
6.22% 

Total (a) 

$ 

$ 

$ 

$ 

68   
-   
1.47% 
135   
3.25% 

384   
85   
4.25% 
500   
6.66% 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(a) 
(b)  Calculated through the termination date.  
(c)  The timing of peak credit facility borrowings varies by company. Therefore, the amounts presented by company might not equal the total peak credit facility 

borrowings for the period. The simultaneous peak credit facility borrowings under all credit facilities during 2009 were $1 billion.  
The following table summarizes the borrowing activity and relevant interest rates under the 2006 $500 million credit 

facility, which was terminated during 2009, for the years ended December 31, 2009 and 2008:  

CIPS 

2006 $500 Million Credit Facility (Terminated) 
2009: 
Average daily borrowings outstanding during 2009( b)  ............................   $ 
Outstanding credit facility borrowings at period end ................................    
Weighted-average interest rate during 2009( b)  ......................................    
Peak credit facility borrowings during 2009( c)(b)  .....................................   $ 
Peak interest rate during 2009( b)  ...........................................................    
2008: 
Average daily borrowings outstanding during 2008 .................................   $ 
58   
Outstanding credit facility borrowings at period end ................................    
62   
Weighted-average interest rate during 2008 ...........................................    
4.21% 
Peak credit facility borrowings during 2008 .............................................   $  135   
Peak interest rate during 2008 ...............................................................     
6.31% 

5   
-   
2.02% 
62   
2.02% 

CILCO 
(Parent) 

$ 

$ 

 -   
-   
-   
 -   
-   

$ 

37   
-   
  3.78% 
75   
$ 
  5.98% 

IP 

 -   
-   
-   
 -   
-   

$ 

$ 

$ 

27   
-   
4.08% 
$  150   
6.50% 

AERG 

$ 

96  
-  
1.34% 
$  151  
2.72% 

$  151  
151  
3.94% 
$  200  
7.01% 

Total (a) 

$ 

$ 

$ 

$ 

150   
-   
1.54% 
263   
3.29% 

323   
263   
4.07% 
465   
7.01% 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(a) 
(b)  Calculated through the termination date.  
(c)  The timing of peak credit facility borrowings varies by company. Therefore, the amounts presented by company might not equal the total peak credit facility 

borrowings for the period. The simultaneous peak credit facility borrowings under all facilities during 2009 were $1 billion.  

On June 30, 2009, Ameren and certain of its 
subsidiaries entered into multiyear credit facility 
agreements with 24 international, national, and regional 
lenders, with no single lender providing more than $146 
million of credit. These facilities, as described below, 
cumulatively provide $2.1 billion of credit through July 14, 
2010, reducing to $1.8795 billion through June 30, 2011, 
and to $1.0795 billion through July 14, 2011.  

2009 Multiyear Credit Agreements  

On June 30, 2009, Ameren, UE, and Genco entered 

into an agreement (the “2009 Multiyear Credit 
Agreement”) to amend and restate the $1.15 billion five-
year revolving credit agreement that was originally entered 
into on July 14, 2005, amended and restated as of 
July 14, 2006, and due to expire in July 2010 (the “Prior 
$1.15 Billion Credit Facility”). Ameren, UE, and Genco 
also entered into a $150 million Supplemental Credit 
Agreement to the 2009 Multiyear Credit Agreement (the 
“Supplemental Agreement”), which provides Ameren, UE, 

and Genco with an additional facility of $150 million with 
terms and conditions substantially identical to the 2009 
Multiyear Credit Agreement. Collectively, these 
agreements are the “2009 Multiyear Credit Agreements.”  
The obligations of each borrower under the 2009 

Multiyear Credit Agreements are several and not joint. 
Except under limited circumstances relating to expenses 
and indemnities, the obligations of UE or Genco are not 
guaranteed by Ameren or by any other subsidiary of 
Ameren. The combined maximum amount available to all 
of the borrowers, collectively, under the 2009 Multiyear 
Credit Agreements is $1.3 billion, and the combined 
maximum amount available to each borrower, individually, 
under the 2009 Multiyear Credit Agreements is limited as 
follows: Ameren – $1.15 billion, UE – $500 million and 
Genco – $150 million (such amounts being each 
borrower’s “Borrowing Sublimit”). CIPS, CILCO and IP 
have no borrowing authority or liability under the 2009 
Multiyear Credit Agreements. 

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On July 14, 2010, when the Supplemental Agreement 
terminates, all commitments and all outstanding amounts 
under the Supplemental Agreement will be consolidated 
with those under the 2009 Multiyear Credit Agreement, 
and the combined maximum amount available to all 
borrowers will be $1.0795 billion. The UE and Genco 
Borrowing Sublimits will remain as noted above; the 
Ameren sublimit will change to $1.0795 billion. Ameren 
has the option of seeking additional commitments from 
existing or new lenders to increase the total facility size to 
$1.3 billion after July 14, 2010. The 2009 Multiyear Credit 
Agreement will terminate with respect to Ameren on 
July 14, 2011, one year after the Prior $1.15 Billion Credit 
Facility. The Borrowing Sublimits of UE and Genco will 
continue to be subject to extensions on a 364-day basis 
(but in no event later than July 14, 2011). The current 
maturity date of their Borrower Sublimits under the 2009 
Multiyear Credit Agreements is June 29, 2010.  

The obligations of all borrowers under the 2009 
Multiyear Credit Agreements are unsecured. The interest 
rates applicable to loans under the 2009 Multiyear Credit 
Agreements will be either the alternate base rate, as 
defined, plus the margin applicable to the particular 
borrower or the eurodollar rate plus the margin applicable 
to the particular borrower. The applicable margins will be 
determined by reference to such borrower’s long-term 
unsecured credit ratings in effect at the time. A 
competitive bid rate is also available if requested by a 
borrower. Letters of credit in an aggregate undrawn face 
amount not to exceed $287.5 million are available for 
issuance for account of the borrowers under the 2009 
Multiyear Credit Agreements (but within the $1.3 billion 
overall combined facility limitation).  

Under the 2009 Multiyear Credit Agreements, the 

principal amount of each revolving loan will be due and 
payable no later than the final maturity of the agreements, 
for Ameren, and the last day of the then applicable 364-
day period for UE and Genco. Ameren, UE and Genco will 
use the proceeds of any borrowings under the 2009 
Multiyear Credit Agreements for general corporate 
purposes, including working capital, and to fund loans 
under the Ameren money pool arrangements.  

2009 Illinois Credit Agreement  

Also on June 30, 2009, Ameren, CIPS, CILCO, and IP 

entered into an $800 million multiyear, senior secured 
credit agreement (the “2009 Illinois Credit Agreement”). 
The 2009 Illinois Credit Agreement replaced the Ameren 
Illinois Utilities’ $500 million credit facility dated July 14, 
2006 (the “2006 $500 Million Credit Facility 
(Terminated)”), and their $500 million credit facility dated 
February 9, 2007 (the “2007 $500 Million Credit Facility 
(Terminated)”), each as previously amended (collectively, 
the “Terminated Illinois Credit Facilities”). They were 
terminated when the 2009 Illinois Credit Agreement went 
into effect.  

Ameren was not a borrower under the Terminated 
Illinois Credit Facilities, but it is a borrower under the 2009 
Illinois Credit Agreement. AERG was a borrower under the 

Terminated Illinois Credit Facilities, but it was not party to 
or a borrower under the 2009 Illinois Credit Agreement. All 
obligations of AERG under the Terminated Illinois Credit 
Facilities have been repaid, and all liens securing such 
obligations have been released. AERG expects to meet its 
external liquidity needs through borrowings under the 
Ameren non-state-regulated subsidiary money pool 
arrangements or other liquidity arrangements.  

The obligations of each borrower under the 2009 
Illinois Credit Agreement are several and not joint. They 
are not guaranteed by Ameren or any other subsidiary of 
Ameren. The maximum amount available to each 
borrower under the facility is limited as follows: Ameren – 
$300 million, CIPS – $135 million, CILCO – $150 million 
and IP – $350 million (such amounts being such 
borrower’s “Borrowing Sublimit”).  

The 2009 Illinois Credit Agreement will terminate with 

respect to all borrowers on June 30, 2011. Each borrowing 
under the 2009 Illinois Credit Agreement must be repaid 
no later than 364 days after such borrowing. In each case, 
the borrower may on such date make a new borrowing, or 
convert or continue such borrowing as a new borrowing 
subject to satisfaction of the applicable conditions. The 
obligations of the Ameren Illinois Utilities under the 2009 
Illinois Credit Agreement are secured by the issuance of 
mortgage bonds, for collateral support, by each such utility 
under its respective mortgage indenture, in an amount 
equal to its respective Borrowing Sublimit. Ameren’s 
obligations are unsecured.  

Loans are available on a revolving basis under the 
2009 Illinois Credit Agreement. They may be repaid and, 
subject to satisfaction of the conditions to borrowing, 
reborrowed from time to time. At the election of each 
borrower, the interest rates applicable under the 2009 
Illinois Credit Agreement are the alternate base rate, as 
defined, plus the margin applicable to the particular 
borrower or the eurodollar rate plus the margin applicable 
to the particular borrower. The applicable margins will be 
determined, in the case of Ameren, by Ameren’s long-term 
unsecured credit ratings in effect, at the time, and in the 
case of the Ameren Illinois Utilities, such utility’s long-term 
secured credit ratings at the time. Letters of credit in an 
aggregate undrawn face amount not to exceed $200 
million are also available for issuance for the account of 
the borrowers under the 2009 Illinois Credit Agreement 
(but within the $800 million overall facility limitation).  
Due to outstanding borrowings under the 2009 
Multiyear Credit Agreements and the 2009 Illinois Credit 
Agreement (including reductions for $15 million of letters 
of credit issued under the 2009 Multiyear Credit 
Agreements), the available amounts under the facilities at 
December 31, 2009, were $555 million and $700 million, 
respectively.  

Other Agreements  

On January 21, 2009, Ameren entered into a 
$20 million term loan agreement due January 20, 2010,

125 

which was fully drawn on January 21, 2009. The average 
annual interest rate for borrowing under the $20 million 
term loan agreement was 2.03% during the year ended 
December 31, 2009. This term loan agreement was repaid 
at maturity in January 2010.  

On June 25, 2008, Ameren entered into a $300 million 

term loan agreement due June 24, 2009, which was fully 
drawn on June 26, 2008. The average annual interest rate 
for borrowing under the $300 million term loan agreement 
was 1.97% during the period it was outstanding in 2009. 
This term loan was repaid at maturity in June 2009 with 
proceeds from the issuance by Ameren of $425 million 
principal amount of senior unsecured notes due May 
2014. See Note 5 – Long-term Debt and Equity 
Financings.  

Indebtedness Provisions and Other Covenants  
The 2009 Multiyear Credit Agreements contain 

conditions to borrowings and issuances of letters of credit, 
including the absence of default or unmatured default, 
material accuracy of representations and warranties 
(excluding any representation after the closing date as to 
the absence of material adverse change and material 
litigation), and required regulatory authorizations. The 
2009 Multiyear Credit Agreements also contain 
nonfinancial covenants, including restrictions on the ability 
to incur liens, to transact with affiliates, to dispose of 
assets, and to merge with other entities. In addition, 
Ameren and certain subsidiaries are restricted to limited 
investments in and other transfers to affiliates, including 
investments in the Ameren Illinois Utilities and their 
subsidiaries.  

The 2009 Multiyear Credit Agreements contain 
identical default provisions including a cross default of a 
borrower to the occurrence of a default by such borrower 
under any other agreement covering indebtedness of such 
borrower and certain subsidiaries (other than project 
finance subsidiaries and non-material subsidiaries) in 
excess of $25 million in the aggregate. A default by an 
Ameren Illinois utility under the 2009 Illinois Credit 
Agreement does not constitute a default under the 2009 
Multiyear Credit Agreements. Any default of Ameren 
under the 2009 Illinois Credit Agreement that occurs solely 
as a result of a default by an Ameren Illinois utility 
thereunder will not constitute a default under either of the 
2009 Multiyear Credit Agreements while Ameren is 
otherwise in compliance with all of its obligations under 
the 2009 Illinois Credit Agreement.  

The 2009 Multiyear Credit Agreements require 
Ameren, UE and Genco each to maintain consolidated 
indebtedness of not more than 65% of its consolidated 
total capitalization pursuant to a calculation set forth in the 
facilities. All of the consolidated subsidiaries of Ameren, 
including the Ameren Illinois Utilities, are included for 
purposes of determining compliance with this 
capitalization test with respect to Ameren. Failure to 
satisfy the capitalization covenant constitutes a default 
under the 2009 Multiyear Credit Agreements. As of 
December 31, 2009, the ratios of consolidated 

indebtedness to total consolidated capitalization, 
calculated in accordance with the provisions of the 2009 
Multiyear Credit Agreements, were 51%, 48% and 54%, 
for Ameren, UE and Genco, respectively.  

The 2009 Illinois Credit Agreement contains 

conditions to borrowings and issuance of letters of credit, 
including the absence of default or unmatured default, 
material accuracy of representations and warranties 
(excluding, for so long as ratings conditions shall be 
satisfied, any representation after the closing date as to 
the absence of material adverse change and material 
litigation, which is new to the 2009 Illinois Credit 
Agreement), and required regulatory authorizations. The 
rating condition is satisfied if the borrower has a Moody’s 
rating of Baa3 or higher or an S&P rating of BBB- or 
higher (in the case of Ameren, with respect to senior 
unsecured long-term debt, and in the case of the Ameren 
Illinois Utilities, with respect to senior secured long-term 
debt). The 2009 Illinois Credit Agreement contains 
nonfinancial covenants, including restrictions on the ability 
to incur liens, to transact with affiliates, to dispose of 
assets, and to merge with other entities. The Ameren 
Illinois Utilities may engage in certain mergers or similar 
transactions that may cause their utility operations to be 
conducted by a single legal entity. In addition, the 2009 
Illinois Credit Agreement has nonfinancial covenants that 
limit the ability of a borrower to invest in or to transfer 
assets to affiliates, covenants regarding the status of the 
collateral securing the 2009 Illinois Credit Agreement, and 
maintenance of the validity of the security interests 
therein.  

The 2009 Illinois Credit Agreement contains default 

provisions. Defaults under the 2009 Illinois Credit 
Agreement apply separately to each borrower; provided 
that a default by an Ameren Illinois utility will constitute a 
default by Ameren. Defaults include a cross default of a 
borrower to the occurrence of a default by such borrower 
under any other agreement covering indebtedness of such 
borrower and certain subsidiaries (other than project 
finance subsidiaries and non-material subsidiaries) in 
excess of $25 million in the aggregate. A default by Genco 
or UE under the 2009 Multiyear Credit Agreements does 
not constitute an event of default under the 2009 Illinois 
Credit Agreement. Any default of Ameren under the 2009 
Multiyear Credit Agreements that occurs solely as a result 
of a default by UE or Genco thereunder will not constitute 
a default under the 2009 Illinois Credit Agreement while 
Ameren is otherwise in compliance with all of its 
obligations under the 2009 Multiyear Credit Agreements. 
Furthermore, under the 2009 Illinois Credit Agreement, the 
occurrence of a default resulting from an event or 
conditions effecting AERG shall be deemed to constitute a 
default with respect to Ameren under the 2009 Illinois 
Credit Agreement, but shall not in itself constitute a default 
with respect to CILCO, unless the liability that CILCO has 
for such default or such underlying event or condition 
giving rise to such default would otherwise constitute a 
default with respect to CILCO if the underlying event or 
condition had occurred or existed at CILCO.  

126 

 The 2009 Illinois Credit Agreement requires Ameren 

and each Ameren Illinois utility to maintain consolidated 
indebtedness of not more than 65% of its consolidated 
total capitalization pursuant to a defined calculation. All of 
the consolidated subsidiaries of Ameren are included for 
purposes of determining compliance with this 
capitalization test with respect to Ameren. As of 
December 31, 2009, the ratios of consolidated 
indebtedness to total consolidated capitalization for 
Ameren, CIPS, CILCO and IP, calculated in accordance 
with the provisions of the 2009 Illinois Credit Agreement, 
were 51%, 44%, 41%, and 46%, respectively. In addition, 
Ameren is required to maintain a ratio of consolidated 
funds from operations plus interest expense to 
consolidated interest expense of 2.0 to 1, at the end of the 
most recent four fiscal quarters, calculated and subject to 
adjustment in accordance with the 2009 Illinois credit 
agreement. Ameren’s ratio as of December 31, 2009, was 
4.6 to 1. Failure to satisfy these covenants constitutes a 
default under the 2009 Illinois Credit Agreement.  
In addition, the 2009 Illinois Credit Agreement 

prohibits CILCO from issuing any preferred stock if, after 
such issuance, the aggregate liquidation value of all 
CILCO preferred stock issued after June 30, 2009, would 
exceed $50 million.  

None of Ameren’s credit facilities or financing 
arrangements contain credit rating triggers that would 
cause default or acceleration of repayment of outstanding 
balances. At December 31, 2009, management believes 
that the Ameren Companies were in compliance with their 
credit facilities and term loan agreement provisions and 
covenants.  

Money Pools  

Ameren has money pool agreements with and among 
its subsidiaries to coordinate and provide for certain short-
term cash and working capital requirements. Separate 
money pools are maintained for utility and non-state-
regulated entities. Ameren Services is responsible for the 
operation and administration of the money pool 
agreements.  

Utility  

Through the utility money pool, the pool participants 
may access the committed credit facilities. CIPS, CILCO 
and IP borrow from each other through the utility money 
pool agreement subject to applicable regulatory short-term 
borrowing authorizations. Ameren Services administers 
the utility money pool and tracks internal and external 
funds separately. Ameren and AERG may participate in 
the utility money pool only as lenders. Internal funds are 
surplus funds contributed to the utility money pool from 
participants. The primary source of external funds for the 
utility money pool are the 2009 Multiyear Credit 
Agreements and the 2009 Illinois Credit Agreement. The 
total amount available to the pool participants from the 
utility money pool at any given time is reduced by the 
amount of borrowings by their affiliates, but increased to 
the extent that the pool participants have surplus funds or 

contribute funds from other external sources. The 
availability of funds is also determined by funding 
requirement limits established by regulatory 
authorizations. CIPS, CILCO and IP rely on the utility 
money pool to coordinate and provide for certain short-
term cash and working capital requirements. Borrowers 
receiving a loan under the utility money pool agreement 
must repay the principal amount of such loan, together 
with accrued interest. The rate of interest depends on the 
composition of internal and external funds in the utility 
money pool. The average interest rate for borrowing under 
the utility money pool for the year ended December 31, 
2009, was 0.19% (2008 – 2.85%).  

Non-state-regulated Subsidiaries  

Ameren Services, Resources Company, Genco, 
AERG, Marketing Company, AFS, and other non-state-
regulated Ameren subsidiaries have the ability, subject to 
Ameren parent company authorization and applicable 
regulatory short-term borrowing authorizations, to access 
funding from the 2009 Multiyear Credit Agreements 
through a non-state-regulated subsidiary money pool 
agreement. The total amount available to the pool 
participants at any time is reduced by borrowings made by 
Ameren’s subsidiaries, but is increased to the extent that 
other pool participants advance surplus funds to the non-
state-regulated subsidiary money pool or remit funds from 
other external sources. See the discussion above for the 
amount available under the 2009 Multiyear Credit 
Agreements at December 31, 2009. The non-state-
regulated subsidiary money pool was established to 
coordinate and to provide short-term cash and working 
capital for Ameren’s non-state-regulated activities. 
Borrowers receiving a loan under the non-state-regulated 
subsidiary money pool agreement must repay the principal 
amount of such loan, together with accrued interest. The 
rate of interest depends on the composition of internal and 
external funds in the non-state-regulated subsidiary 
money pool. These rates are based on the cost of funds 
used for money pool advances. The average interest rate 
for borrowing under the non-state-regulated subsidiary 
money pool for the year ended December 31, 2009 was 
1.64% (2008 – 3.51%).  

See Note 14 – Related Party Transactions for the 
amount of interest income and expense from the money 
pool arrangements recorded by the Ameren Companies 
for the years ended December 31, 2009, 2008, and 2007.  
In addition, a unilateral borrowing agreement exists 

between Ameren, IP, and Ameren Services, which 
enables IP to make short-term borrowings directly from 
Ameren. The aggregate amount of borrowings outstanding 
at any time by IP under the unilateral borrowing 
agreement and the utility money pool agreement, together 
with any outstanding external credit facility borrowings by 
IP, may not exceed $500 million, pursuant to authorization 
from the ICC. IP is not currently borrowing under the 
unilateral borrowing agreement. Ameren Services is 
responsible for operation and administration of the 
unilateral borrowing agreement.

127 

  
NOTE 5 – LONG-TERM DEBT AND EQUITY FINANCINGS  

The following table presents long-term debt outstanding for the Ameren Companies as of December 31, 2009 and 

2008:  

Ameren (Parent): 

UE: 
First mortgage bonds:(a) 

8.875% Senior unsecured notes due 2014 ...........................................................................................................................  
Less: Unamortized discount and premium .......................................................................................................................  
Long-term debt, net ...................................................................................................................................................  

5.25% Senior secured notes due 2012(b) ..............................................................................................................................  
4.65% Senior secured notes due 2013(b) ..............................................................................................................................  
5.50% Senior secured notes due 2014(b) ..............................................................................................................................  
4.75% Senior secured notes due 2015(b) ..............................................................................................................................  
5.40% Senior secured notes due 2016(b) ..............................................................................................................................  
6.40% Senior secured notes due 2017(b) ..............................................................................................................................  
6.00% Senior secured notes due 2018(b) ..............................................................................................................................  
5.10% Senior secured notes due 2018(b) ..............................................................................................................................  
6.70% Senior secured notes due 2019(b) ..............................................................................................................................  
5.10% Senior secured notes due 2019(b) ..............................................................................................................................  
5.00% Senior secured notes due 2020(b) ..............................................................................................................................  
5.45% Series due 2028(c)......................................................................................................................................................  
5.50% Senior secured notes due 2034(b) ..............................................................................................................................  
5.30% Senior secured notes due 2037(b) ..............................................................................................................................  
8.45% Senior secured notes due 2039(b) ..............................................................................................................................  

Environmental improvement and pollution control revenue bonds:(a)(b)(c)(d)  

1992 Series due 2022 ..........................................................................................................................................................  
1998 Series A due 2033 .......................................................................................................................................................  
1998 Series B due 2033 .......................................................................................................................................................  
1998 Series C due 2033 .......................................................................................................................................................  

Subordinated deferrable interest debentures: 

Capital lease obligations: 

7.69% Series A due 2036(e) ..................................................................................................................................................  

City of Bowling Green capital lease (Peno Creek CT) ...........................................................................................................  
Audrain County capital lease (Audrain County CT) ...............................................................................................................  
Total long-term debt, gross .............................................................................................................................................  
Less: Unamortized discount and premium .......................................................................................................................  
Less: Maturities due within one year ...............................................................................................................................  
Long-term debt, net ...................................................................................................................................................  

CIPS: 
First mortgage bonds:(a) 

6.625% Senior secured notes due 2011(b) ............................................................................................................................  
7.61% Series 1997-2 due 2017 ............................................................................................................................................  
6.125% Senior secured notes due 2028(b) ............................................................................................................................  
6.70% Senior secured notes due 2036(b) ..............................................................................................................................  

Environmental improvement and pollution control revenue bonds: 

2000 Series A 5.50% due 2014 ............................................................................................................................................  
1993 Series C-1 5.95% due 2026 .........................................................................................................................................  
1993 Series C-2 5.70% due 2026 .........................................................................................................................................  
1993 Series B-1 due 2028(d) .................................................................................................................................................  
Total long-term debt, gross .............................................................................................................................................  
Less: Unamortized discount and premium .......................................................................................................................  
Long-term debt, net ...................................................................................................................................................  

Genco: 
Unsecured notes: 

Senior notes Series D 8.35% due 2010 ................................................................................................................................  
Senior notes Series F 7.95% due 2032 .................................................................................................................................  
Senior notes Series H 7.00% due 2018 ................................................................................................................................  
Senior notes Series I 6.30% due 2020 ..................................................................................................................................  
Total long-term debt, gross .............................................................................................................................................  
Less: Unamortized discount and premium .......................................................................................................................  
Less: Maturities due within one year ...............................................................................................................................  
Long-term debt, net ...................................................................................................................................................  

2009 

2008 

$ 

$ 

$ 

425  
(2) 
423  

173  
200  
104  
114  
260  
425  
250  
200  
450  
300  
85  
44  
184  
300  
350  

47  
60  
50  
50  

66  

78  
240  
  4,030  
(8) 
(4) 
$   4,018  

$ 

$ 

150  
40  
60  
61  

51  
35  
8  
17  
422  
(1) 
421  

$ 

200  
275  
300  
250  
  1,025  
(2) 
(200) 
823  

$ 

$ 

$ 

$ 

-  
-  
-  

173  
200  
104  
114  
260  
425  
250  
200  
450  
300  
85  
44  
184  
300  
-  

47  
60  
50  
50  

66  

82  
240  
3,684  
(7) 
(4) 
$   3,673  

$ 

$ 

$ 

$ 

150  
40  
60  
61  

51  
35  
8  
17  
422  
(1) 
421  

200  
275  
300  
-  
775  
(1) 
-  
774  

128 

  
 
 
 
 
  
  
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
  
  
 
 
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
8.70% Senior notes due 2009...............................................................................................................................................  
9.375% Senior bonds due 2029 ............................................................................................................................................  
Fair-market value adjustments ...................................................................................................................................................   
Total long-term debt, gross .............................................................................................................................................  
Less: Maturities due within one year ...............................................................................................................................  
Long-term debt, net ...................................................................................................................................................  

8.875% Senior secured notes due 2013(b) ............................................................................................................................  
6.20% Senior secured notes due 2016(b) ..............................................................................................................................  
6.70% Senior secured notes due 2036(b) ..............................................................................................................................  

Environmental improvement and pollution-control revenue bonds:(a)(c) 

6.20% Series 1992B due 2012 .............................................................................................................................................  
5.90% Series 1993 due 2023................................................................................................................................................  
Long-term debt, net ...................................................................................................................................................  

CILCORP (Parent): 
Unsecured notes: 

CILCO: 
First mortgage bonds:(a) 

IP: 
Mortgage bonds:(a) 

7.50% Series due 2009 ........................................................................................................................................................  
6.25% Senior secured notes due 2016(b) ..............................................................................................................................  
6.125% Senior secured notes due 2017(b) ............................................................................................................................  
6.250% Senior secured notes due 2018(b) ............................................................................................................................  
9.750% Senior secured notes due 2018(b) ............................................................................................................................  

Pollution control revenue bonds:(a)(c) 

5.70% 1994A Series due 2024 .............................................................................................................................................  
5.40% 1998A Series due 2028 .............................................................................................................................................  
5.40% 1998B Series due 2028 .............................................................................................................................................  
Fair-market value adjustments ...................................................................................................................................................   
Total long-term debt, gross .............................................................................................................................................  
Less: Unamortized discount and premium .......................................................................................................................  
Less: Maturities due within one year ...............................................................................................................................  
Long-term debt, net ...................................................................................................................................................  
Ameren consolidated long-term debt, net ...................................................................................................................................  

2009 

2008 

$ 

$ 

$ 

$ 

$ 

-  
2  
-  
2  
-  
2  

150  
54  
42  

1  
32  
279  

-  
75  
250  
337  
400  

36  
19  
33  
6  
  1,156  
(9) 
-  
$   1,147  
$   7,113  

$ 

$ 

$ 

$ 

$ 

124  
210  
49  
383  
(126) 
257  

150  
54  
42  

1  
32  
279  

250  
75  
250  
337  
400  

36  
19  
33  
10  
1,410  
(10) 
(250) 
$   1,150  
$   6,554  

(a)  At December 31, 2009, most property and plant was mortgaged under, and subject to liens of, the respective indentures pursuant to which the bonds were 
issued. Substantially all of the long-term debt issued by UE, CIPS (excluding the tax-exempt debt), CILCO and IP is secured by a lien on substantially all of 
its property and franchises.  

(b)  These notes are collaterally secured by first mortgage bonds issued by UE, CIPS, CILCO, or IP, respectively, and will remain secured at each company until 
the following series are no longer outstanding with respect to that company: UE – 5.45% Series due 2028 (currently callable at 101% of par, declining to 
100% of par in October 2010), 6.00% Series due 2018, and 6.70% Series due 2019; CIPS – 7.61% Series 1997-2 due 2017 (currently callable at 102.28% of 
par, declining annually thereafter to 100% of par in June 2012); CILCO – 6.20% Series 1992B due 2012 (currently callable at 100% of par), 5.90% Series 
1993 due 2023 (currently callable at 100% of par), and 8.875% Series due 2013; IP – 6.125% Series due 2017, 6.25% Series due 2018, 9.75% Series due 
2018, and all IP pollution control revenue bonds.  
6.20% Series 1992B and 5.90% Series 1993 bonds are backed by an insurance guarantee policy.  
Interest rates, and the periods during which such rates apply, vary depending on our selection of certain defined rate modes. Maximum interest rates could 
range up to 18% depending upon the series of bonds. The average interest rates for the years 2009 and 2008 were as follows:  

(c)  Environmental improvement or pollution control series secured by first mortgage bonds. In addition, all of the series except UE’s 5.45% Series and CILCO’s 

(d) 

2009  
UE 1992 Series ................................................................................................   0.68% 
UE 1998 Series A .............................................................................................   0.99% 
UE 1998 Series B .............................................................................................   1.02% 
UE 1998 Series C .............................................................................................   0.99% 
CIPS 1993 Series B-1.......................................................................................   1.34% 

2008  
3.66% 
3.97% 
3.71% 
4.06% 
1.98% 

(e)  Under the terms of the subordinated debentures, UE may, under certain circumstances, defer the payment of interest for up to five years. If UE should elect 

to defer interest payments, UE dividend payments to Ameren would be prohibited. UE has not elected to defer any interest payments.  

129 

 
 
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
  
  
  
The following table presents the aggregate maturities of long-term debt, including current maturities, for the Ameren 

Companies at December 31, 2009:  

Ameren 
(Parent)(a)  

2010 ...................................   $ 
- 
2011 ...................................  
- 
2012 ...................................  
- 
2013 ...................................  
- 
2014 ...................................  
  425 
Thereafter ...........................  
- 
Total ...................................   $   425 

$ 

UE (a) 
4 
5 
178 
205 
109 
  3,529 
$   4,030 

CIPS (a) 
- 
$ 
150 
- 
- 
51 
221 
$    422 

Genco (a)(b) 
$ 

200 
- 
- 
- 
- 
825 
$   1,025 

CILCORP 
(Parent) 
- 
$ 
- 
- 
- 
- 
2 
$   2 

CILCO 
- 
$ 
- 
1 
  150 
- 
  128 
$   279 

$ 

IP (a)(c) 
- 
- 
- 
- 
- 
  1,150 
$   1,150 

Ameren 
Consolidated 

$ 

204 
155 
179 
355 
585 
  5,855 
$   7,333 

respectively.  

(a)  Excludes unamortized discount and premium of $2 million, $8 million, $1 million, $2 million, and $9 million at Ameren (Parent), UE, CIPS, Genco, and IP, 

(b)  Excludes $45 million due in 2010 related to a note payable to an affiliate. See Note 14 – Related Party Transactions for additional information.  
(c)  Excludes $6 million related to IP’s long-term debt fair-market value adjustments, which are being amortized to interest expense over the remaining life of the debt.  

All of the Ameren Companies expect to fund maturities of long-term debt, short-term borrowings, credit facility 
borrowings and contractual obligations through a combination of cash flow from operations and external financing. See 
Note 4 – Credit Facility Borrowings and Liquidity for a discussion of external financing availability.  

In November 2008, Ameren, CIPS, Genco, CILCO 

and IP, filed a Form S-3 shelf registration statement 
registering the issuance of an indeterminate amount of 
certain types of securities, which expires in November 
2011. In June 2008, UE filed a Form S-3 shelf registration 
statement registering the issuance of an indeterminate 
amount of certain types of securities, which expires in 
June 2011.  

The following table presents information with respect 

to the Form S-3 shelf registration statements filed and 
effective for certain Ameren Companies as of 
December 31, 2009:  

Effective Date 

Authorized 
Amount 
Ameren .................................................     November 2008     Not limited 
UE  .......................................................    
June 2008     Not limited 
CIPS .....................................................     November 2008     Not limited 
Genco ...................................................     November 2008     Not limited 
CILCO ..................................................     November 2008     Not limited 
IP   .......................................................     November 2008     Not limited 

Ameren  

In July 2008, Ameren filed a Form S-3 registration 
statement with the SEC authorizing the offering of six 
million additional shares of its common stock under the 
DRPlus. Shares of common stock sold under DRPlus are, 
at Ameren’s option, newly issued shares, treasury shares, 
or shares purchased in the open market or in privately 
negotiated transactions. Ameren is currently selling newly 
issued shares of its common stock under DRPlus.  
Ameren is also selling newly issued shares of 

common stock under its 401(k) plan pursuant to an 
effective SEC Form S-8 registration statement. Under 
DRPlus and its 401(k) plan, Ameren issued 3.2 million, 
4.0 million, and 1.7 million shares of common stock in 
2009, 2008, and 2007, respectively, which were valued at 
$82 million, $154 million, and $91 million for the respective 
years.  

In May 2009, Ameren issued $425 million of 8.875% 
senior unsecured notes due May 15, 2014, with interest 
payable semiannually on May 15 and November 15 of 
each year, beginning November 15, 2009. Ameren 
received net proceeds of $420 million, which were used, 
together with other corporate funds, to repay borrowings 
under its $300 million term loan agreement and, by way of 
a capital contribution to CILCORP, providing funds for 
CILCORP to repay its outstanding 8.70% senior notes on 
their due date of October 15, 2009.  

In September 2009, Ameren issued and sold 
21.85 million shares of its common stock at $25.25 per 
share, for proceeds of $535 million, net of $17 million of 
issuance costs. Ameren used the net offering proceeds to 
make investments in its rate-regulated utility subsidiaries 
in the form of equity capital contributions as follows: UE – 
$436 million, CIPS – $13 million, CILCO – $25 million, and 
IP – $61 million.  

UE  

In April 2008, UE issued $250 million of 6.00% senior 

secured notes due April 1, 2018, with interest payable 
semiannually on April 1 and October 1 of each year, 
beginning in October 2008. These notes are secured by 
first mortgage bonds. UE received net proceeds of $248 
million, which were used to redeem certain of UE’s 
outstanding auction-rate environmental improvement 
revenue refunding bonds discussed below and to repay 
short-term debt. In connection with this issuance of $250 
million of senior secured notes, UE agreed that, so long as 
these senior secured notes are outstanding, it would not, 
prior to maturity, cause a first mortgage bond release date 
to occur.  

In April 2008, $63 million of UE’s Series 2000B 

auction-rate environmental improvement revenue 
refunding bonds were redeemed at par value plus accrued 
interest.  

In May 2008, $43 million of UE’s Series 1991, 

$64 million of UE’s Series 2000A and $60 million of UE’s 
Series 2000C auction-rate environmental improvement 

130 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
  
 
revenue refunding bonds were redeemed at par value plus 
accrued interest. Also, in May 2008, $148 million of UE’s 
6.75% Series first mortgage bonds matured and were retired.  

In June 2008, UE issued $450 million of 6.70% senior 
secured notes due February 1, 2019, with interest payable 
semiannually on February 1 and August 1 of each year, 
beginning in February 2009. These notes are secured by first 
mortgage bonds. UE received net proceeds of $446 million, 
which was used to repay short-term debt. A portion of that 
debt had been incurred so that UE could pay at maturity the 
6.75% Series first mortgage bonds noted above. In 
connection with this issuance of $450 million of senior 
secured notes, UE agreed that, so long as these senior 
secured notes are outstanding, it would not, prior to maturity, 
cause a first mortgage bond release date to occur. The first 
mortgage bond release date is the date at which the security 
provided by the pledge under UE’s first mortgage indenture 
would no longer be available to holders of any outstanding 
series of its senior secured notes and such indebtedness 
would become senior unsecured indebtedness.  

In March 2009, UE issued $350 million of 8.45% senior 

secured notes due March 15, 2039, with interest payable 
semiannually on March 15 and September 15 of each year, 
beginning in September 2009. These notes are secured by 
first mortgage bonds. UE received net proceeds of $346 
million, which were used to repay short-term debt. In 
connection with this issuance of $350 million of senior 
secured notes, UE agreed that, so long as these senior 
secured notes are outstanding, it would not, prior to maturity, 
cause a first mortgage bond release date to occur.  

CIPS  

In April 2008, $35 million of CIPS’ Series 2004 auction-
rate environmental improvement revenue refunding bonds 
were redeemed at par value plus accrued interest.  

In December 2008, $15 million of CIPS’ 5.375% senior 

secured notes matured and were retired.  

Genco  

In April 2008, Genco issued and sold, with registration 
rights in a private placement, $300 million of 7.00% senior 
unsecured notes due April 15, 2018, with interest payable 
semiannually on April 15 and October 15 of each year, 
beginning in October 2008. Genco received net proceeds of 
$298 million, which was used to fund capital expenditures, to 
repay short-term debt, and for other general corporate 
purposes. Genco exchanged the outstanding unregistered 
unsecured notes for registered unsecured notes in July 2008.  

In November 2009, Genco issued $250 million of 6.30% 

senior unsecured notes due April 1, 2020, with interest 
payable semiannually on April 1 and October 1 of each year, 
beginning in April 2010. Genco received net proceeds of 
$247 million, which were used to repay short-term debt, and 
for general corporate purposes.  

CILCORP  

In October 2009, $124 million of CILCORP’s 8.70% 

senior notes matured and were retired.  

In December 2009, CILCORP paid $256 million, 
including tender offer and consent payments and accrued 
interest, in connection with the repurchase and cancellation 
of $208 million principal amount outstanding of its 9.375% 
senior bonds. After the repurchase, approximately $2 million 
principal amount of senior bonds remained outstanding. 
Sufficient consents were received to approve the adoption of 
amendments to eliminate certain restrictive covenants to the 
related indenture. As a result of this cancellation, fair-market 
value adjustments related to the senior bonds were reduced 
by $44 million during 2009.  

In February 2010, CILCORP completed a covenant 
defeasance of its remaining outstanding 9.375% senior 
bonds due 2029 by depositing approximately $2.7 million in 
U.S. government obligations and cash with the indenture 
trustee. This deposit will be used solely to satisfy the principal 
and remaining interest obligations on these bonds. In 
connection with this covenant defeasance, the lien on the 
capital stock of CILCO securing these bonds was released.  

CILCO  

In April 2008, $19 million of CILCO’s Series 2004 
auction-rate environmental improvement revenue refunding 
bonds were redeemed at par value plus accrued interest.  

In July 2008, CILCO redeemed the remaining 165,000 

shares of its 5.85% Class A preferred stock at a redemption 
price of $100 per share plus accrued and unpaid dividends. 
The redemption completed CILCO’s mandatory redemption 
obligations for this series of preferred stock.  

In December 2008, CILCO issued $150 million of 
8.875% senior secured notes due December 15, 2013, with 
interest payable semiannually on June 15 and December 15 
of each year, beginning in June 2009. These notes are 
secured by first mortgage bonds. CILCO received net 
proceeds of $149 million, which were used to repay short-
term borrowings. In connection with this issuance of 
$150 million of senior secured notes, CILCO agreed that, so 
long as these senior secured notes are outstanding, it would 
not, prior to maturity, cause a first mortgage bond release 
date to occur. The mortgage bond release date is the date at 
which the security provided by the pledge under CILCO’s first 
mortgage indenture would no longer be available to holders 
of any outstanding series of its senior secured notes and 
such indebtedness would become senior unsecured 
indebtedness.  

IP  

In April 2008, IP issued and sold, with registration rights 
in a private placement, $337 million of 6.25% senior secured 
notes due April 1, 2018, with interest payable semiannually 
on April 1 and October 1 of each year, beginning in October 
2008. IP received net proceeds of $334 million, which were 
used to redeem all of IP’s

131 

  
  
outstanding auction-rate pollution control revenue 
refunding bonds during May and June 2008, as discussed 
below. In connection with IP’s April 2008 issuance of 
$337 million of senior secured notes, IP agreed that, so 
long as these senior secured notes are outstanding, it 
would not, prior to maturity, cause a first mortgage bond 
release date to occur. The mortgage bond release date is 
the date at which the security provided by the pledge 
under IP’s first mortgage indenture would no longer be 
available to holders of any outstanding series of its senior 
secured notes and such indebtedness would become 
senior unsecured indebtedness. IP exchanged the 
outstanding unregistered secured notes for registered 
secured notes in June 2008.  

In May 2008, IP redeemed its $112 million Series 
2001 Non-AMT, $75 million Series 2001 AMT, $70 million 
1997 Series A, and $45 million 1997 Series B auction-rate 
pollution control revenue bonds at par value plus accrued 
interest. In June 2008, IP redeemed its $35 million 1997 
Series C auction-rate pollution control revenue bonds at 
par value plus accrued interest.  

payable to IP SPT. Previous redemptions occurred in the 
first and second quarters of 2008 for $19 million and 
$20 million, respectively. This was the remaining 
outstanding amount of $864 million of TFNs issued by the 
IP SPT in December 1998.  

In October 2008, IP issued and sold, with registration 
rights in a private placement, $400 million of 9.75% senior 
secured notes due November 15, 2018, with interest 
payable semiannually on November 15 and May 15 of 
each year, beginning in May 2009. IP received net 
proceeds of $391 million, which were used to repay short-
term debt. In connection with IP’s October 2008 issuance 
of $400 million of senior secured notes, IP agreed that, so 
long as these senior secured notes are outstanding, it 
would not, prior to maturity, cause a first mortgage bond 
release date to occur. In February 2009, IP commenced 
an offer to exchange the outstanding unregistered secured 
notes for registered secured notes. In March 2009, IP 
exchanged all $400 million of its unregistered 9.75% 
senior secured notes for a like amount of registered 9.75% 
senior secured notes due November 15, 2018.  

In September 2008, IP redeemed the remaining 

In June 2009, $250 million of IP’s 7.50% series first 

portion of its $54 million principal amount 5.65% note 

mortgage bonds matured and were retired.

Indenture Provisions and Other Covenants  

UE’s, CIPS’, CILCO’s and IP’s indenture provisions and articles of incorporation include covenants and provisions 
related to issuances of first mortgage bonds and preferred stock. UE, CIPS, CILCO and IP are required to meet certain 
ratios to issue additional first mortgage bonds and preferred stock. However, not meeting these ratios would not result in a 
default under these covenants and provisions. The following table includes the required and actual earnings coverage 
ratios for interest charges and preferred dividends and bonds and preferred stock issuable for the 12 months ended 
December 31, 2009, at an assumed interest and dividend rate of 8%.  

Required Interest 
Coverage Ratio(a) 

Actual Interest 
Coverage Ratio  Bonds  Issuable(b) 

Required Dividend 
Coverage Ratio(c) 

2.9 
4.2 
7.6 
3.6 

UE  .....................................              2.0 
CIPS ...................................              2.0 
CILCO ................................              2.0 (d) 
IP   .....................................              2.0 
(a)  Coverage required on the annual interest charges on first mortgage bonds outstanding and to be issued. Coverage is not required in certain cases when 

             2.5 
             1.5 
             2.5 
             1.5 

$   1,255 
344 
214 
  1,191 

additional first mortgage bonds are issued on the basis of retired bonds.  
(b)  Amount of bonds issuable based either on required coverage ratios or unfunded property additions, whichever is more restrictive. The amounts shown also 
include bonds issuable based on retired bond capacity of $95 million, $18 million, $44 million, and $536 million, at UE, CIPS, CILCO and IP, respectively.  
(c)  Coverage required on the annual interest charges on all long-term debt (CIPS only) and the annual dividend on preferred stock outstanding and to be issued, 
as required in the respective company’s articles of incorporation. For CILCO, this ratio must be met for a period of 12 consecutive calendar months within the 
15 months immediately preceding the issuance.  
In lieu of meeting the interest coverage ratio requirement, CILCO may attempt to meet an earnings requirement of at least 12% of the principal amount of all 
mortgage bonds outstanding and to be issued. For the 12 months ended December 31, 2009, CILCO had earnings equivalent to at least 38% of the principal 
amount of all mortgage bonds outstanding.  

(e)  See Note 4 – Credit Facility Borrowings and Liquidity for a discussion regarding a restriction on the issuances of preferred stock by CILCO.  

(d) 

Actual Dividend 
Coverage Ratio 
44.6 
2.0 
155.0 
1.8 

Preferred  Stock 
Issuable 
$  1,251   
114   
50 (e) 
244   

UE, CIPS, Genco, CILCO and IP as well as certain 
other nonregistrant Ameren subsidiaries are subject to 
Section 305(a) of the Federal Power Act, which makes it 
unlawful for any officer or director of a public utility, as 
defined in the Federal Power Act, to participate in the 
making or paying of any dividend from any funds “properly 
included in capital account.” The meaning of this limitation 
has never been clarified under the Federal Power Act or 
FERC regulations; however, FERC has consistently 
interpreted the provision to allow dividends to be paid as 

long as (1) the source of the dividends is clearly disclosed, 
(2) the dividends are not excessive and (3) there is no 
self-dealing on the part of corporate officials. At a 
minimum, Ameren believes that dividends can be paid by 
its subsidiaries that are public utilities from net income and 
retained earnings. In addition, under Illinois law, CIPS, 
CILCO and IP may not pay any dividend on their 
respective stock, unless, among other things, their 
respective earnings

132 

  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
and earned surplus are sufficient to declare and pay a 
dividend after provision is made for reasonable and proper 
reserves, or unless CIPS, CILCO or IP has specific 
authorization from the ICC.  

UE’s mortgage indenture contains certain provisions 
that restrict the amount of common dividends that can be 
paid by UE. Under this mortgage indenture, $31 million of 
total retained earnings was restricted against payment of 
common dividends, except those dividends payable in 
common stock, which left $1.8 billion of free and 
unrestricted retained earnings at December 31, 2009.  
CIPS’ articles of incorporation and mortgage 
indentures require its dividend payments on common 
stock to be based on ratios of common stock to total 
capitalization and other provisions related to certain 
operating expenses and accumulations of earned surplus.  
CILCO’s articles of incorporation prohibit the payment 

of dividends on its common stock from either paid-in 
surplus or any surplus created by a reduction of stated 
capital or capital stock. Dividend payment is also 
prohibited if at the time of dividend declaration the earned 
surplus account (after deducting the payment of such 
dividends) would not contain an amount at least equal to 
two times the annual dividend requirement on all 
outstanding shares of CILCO’s preferred stock.  

Genco’s indenture includes provisions that require 

Genco to maintain certain interest coverage and debt-to-
capital ratios in order for Genco to pay dividends, to make 
certain principal or interest payments, to make certain 
loans to or investments in affiliates, or to incur additional 

indebtedness. The following table summarizes these 
ratios for the 12 months ended December 31, 2009:  

Required 
Interest 
Coverage 
Ratio 
Genco(a)  ..................   1.75(b)  
(a) 

Actual 
Interest 
Coverage 
Ratio 
5.62 

Required 
Debt-to- 
Capital 
Ratio 
60% 

Actual 
Debt-to- 
Capital 
Ratio 
52% 

Interest coverage ratio relates to covenants about certain dividend, 
principal, and interest payments on certain subordinated intercompany 
borrowings. The debt-to-capital ratio relates to a debt incurrence 
covenant, which also requires an interest coverage ratio of 2.5 for the 
four fiscal quarters most recently ended.  

(b)  Ratio excludes amounts payable under Genco’s intercompany note to 

CIPS. The ratio must be met both for the prior four fiscal quarters and for 
the succeeding four six-month periods.  
Genco’s debt incurrence-related ratio restrictions and 
restricted payment limitations under its indenture may be 
disregarded if both Moody’s and S&P reaffirm the ratings 
of Genco in place at the time of the debt incurrence after 
considering the additional indebtedness.  

In order for the Ameren Companies to issue securities 

in the future, they will have to comply with all applicable 
tests in effect at the time of any such issuances.  

Off-Balance-Sheet Arrangements  

At December 31, 2009, none of the Ameren 
Companies had any off-balance-sheet financing 
arrangements, other than operating leases entered into in 
the ordinary course of business. None of the Ameren 
Companies expect to engage in any significant off-
balance-sheet financing arrangements in the near future.

133 

  
 
 
 
 
 
 
 
 
 
  
  
NOTE 6 – OTHER INCOME AND EXPENSES  

The following table presents Other Income and Expenses for each of the Ameren Companies for the years ended 

December 31, 2009, 2008, and 2007:  

Ameren:(a)  
Miscellaneous income: 

Interest and dividend income ...................................................................................................................................  
Interest income on industrial development revenue bonds .......................................................................................  
Allowance for equity funds used during construction ................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous income ..........................................................................................................................................  
Miscellaneous expense: 

Donations ................................................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous expense ........................................................................................................................................  
UE: 
Miscellaneous income: 

Interest and dividend income ...................................................................................................................................  
Interest income on industrial development revenue bonds .......................................................................................  
Allowance for equity funds used during construction ................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous income ..........................................................................................................................................  
Miscellaneous expense: 

Donations ................................................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous expense ........................................................................................................................................  
CIPS: 
Miscellaneous income: 

Interest and dividend income ...................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous income ..........................................................................................................................................  
Miscellaneous expense: 

Donations ................................................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous expense ........................................................................................................................................  
Genco: 
Miscellaneous income: 

Interest and dividend income ...................................................................................................................................   
Total miscellaneous income ..........................................................................................................................................  
Miscellaneous expense: 

Other .......................................................................................................................................................................  
Total miscellaneous expense ........................................................................................................................................  
CILCO: 
Miscellaneous income: 

Interest and dividend income ...................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous income ..........................................................................................................................................  
Miscellaneous expense: 

Donations ................................................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous expense ........................................................................................................................................  
IP: 
Miscellaneous income: 

Interest and dividend income ...................................................................................................................................  
Allowance for equity funds used during construction ................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous income ..........................................................................................................................................  
Miscellaneous expense: 

Donations ................................................................................................................................................................  
Other .......................................................................................................................................................................  
Total miscellaneous expense ........................................................................................................................................  

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

134 

2009 

2008 

2007 

$ 

2  
28  
36  
5  
$  71  

$  (12) 
(11) 
$  (23) 

$ 

1  
28  
33  
1  
$  63  

$ 

$ 

$ 

$ 

$ 

$ 

$ 
$ 

$ 
$ 

$ 

$ 

$ 

$ 

(3) 
(4) 
(7) 

5  
3  
8  

(1) 
(1) 
(2) 

-  
-  

-  
-  

1  
-  
1  

(1) 
(4) 
(5) 

$ 

-  
2  
1  
$      3  

$ 

$ 

(2) 
(1) 
(3) 

$  15  
28  
28  
9  
$  80  

$  (13) 
(18) 
$  (31) 

$ 

5  
28  
28  
1  
$  62  

$ 

$ 

(3) 
(6) 
(9) 

$ 

9  
2  
$  11  

$ 

$ 

$ 
$ 

$ 
$ 

$ 

$ 

$ 

$ 

(2) 
(1) 
(3) 

1  
1  

(1) 
(1) 

1  
1  
2  

(2) 
(3) 
(5) 

$ 

5  
-  
6  
$    11  

$ 

$ 

(3) 
(2) 
(5) 

$  27  
28  
5  
15  
$  75  

$ 

$ 

(13) 
(12) 
(25) 

$ 

4  
28  
4  
2  
$  38  

$ 

$ 

(2) 
(5) 
(7) 

$  16  
1  
$  17  

$ 

$ 

$ 
$ 

$ 
$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

(2) 
(1) 
(3) 

-  
-  

-  
-  

4  
1  
5  

(1) 
(5) 
(6) 

8  
-  
6  
 14  

(3) 
(2) 
(5) 

  
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
  
  
  
  
  
  
 
 
 
  
  
  
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
  
  
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
 
 
 
  
NOTE 7 – DERIVATIVE FINANCIAL INSTRUMENTS  
We use derivatives principally to manage the risk of 

changes in market prices for natural gas, coal, diesel, 
electricity, uranium, and emission allowances. Such price 
fluctuations may cause the following:  
  an unrealized appreciation or depreciation of our 

contracted commitments to purchase or sell when 
purchase or sale prices under the commitments are 
compared with current commodity prices;  
  market values of coal, natural gas, and uranium 

inventories or emission allowances that differ from the 
cost of those commodities in inventory; and  

  actual cash outlays for the purchase of these 

commodities that differ from anticipated cash outlays.  
The derivatives that we use to hedge these risks are 

governed by our risk management policies for forward 
contracts, futures, options, and swaps. Our net positions 
are continually assessed within our structured hedging 
programs to determine whether new or offsetting 
transactions are required. The goal of the hedging 
program is generally to mitigate financial risks while 
ensuring that sufficient volumes are available to meet our 
requirements. Contracts we enter into as part of our risk 
management program may be settled financially, settled 
by physical delivery, or net settled with the counterparty. 

The following table presents open gross derivative volumes by commodity type as of December 31, 2009:  

Commodity 

NPNS 
Contracts(a)  

Cash Flow 
Hedges(b) 

Quantity 
Other 
Derivatives(c)  

Derivatives Subject to 
Regulatory Deferral(d) 

Coal (in tons) 

Natural gas (in mmbtu) 

Ameren(e)  ...............................................................................     114,747,000  
UE  .........................................................................................    
80,540,000  
Genco ....................................................................................    
17,403,000  
CILCO ....................................................................................    
7,782,000  

Ameren(e)  ...............................................................................     164,843,000  
UE  .........................................................................................    
21,683,000  
CIPS ......................................................................................    
27,625,000  
Genco ....................................................................................    
(f ) 
CILCO ....................................................................................    
49,580,000  
IP   .........................................................................................    
65,956,000  

Heating oil (in gallons) 

Ameren(e)  ...............................................................................    
UE  .........................................................................................    
Genco ....................................................................................    
CILCO ....................................................................................    

Power (in megawatthours) 

(f ) 
(f ) 
(f ) 
(f ) 

Ameren(e)  ...............................................................................    
UE  .........................................................................................    
CIPS ......................................................................................    
CILCO ....................................................................................    
IP   .........................................................................................    

Uranium (in pounds) 

Ameren ..................................................................................    
UE  .........................................................................................    

75,948,000  
3,579,000  
(f ) 
(f ) 
(f ) 

  32,136,000  
(f ) 
(f ) 
(f ) 
(f ) 

(f ) 
(f ) 

(f ) 
(f ) 

(f ) 
(f ) 
(f ) 
(f ) 

(f ) 
(f ) 
(f ) 
(f ) 
(f ) 
(f ) 

(f ) 
(f ) 
(f ) 
(f ) 

(f ) 
(f ) 
(f ) 
(f ) 

28,104,000   
5,390,000   
(f ) 
7,383,000   
(f ) 
(f ) 

94,254,000   
(f ) 
48,126,000   
21,286,000   

22,182,000   
608,000   
(f ) 
(f ) 
(f ) 

(f ) 
(f ) 

(f ) 
(f ) 
(f ) 
(f ) 

136,266,000   
20,730,000   
22,228,000   
(f ) 
36,368,000   
56,941,000   

117,300,000   
117,300,000   
(f ) 
(f ) 

35,871,000   
4,071,000   
10,494,000   
5,406,000   
15,900,000   

250,000   
250,000   

(a)  Contracts through December 2013, March 2015, and September 2035 for coal, natural gas, and power, respectively.  
(b)  Contracts through December 2012 for power.  
(c)  Contracts through April 2012, December 2013, and May 2013 for natural gas, heating oil, and power, respectively.  
(d)  Contracts through October 2015, December 2013, December 2012, and November 2011 for natural gas, heating oil, power, and uranium, respectively.  
(e) 
(f)  Not applicable.  

Includes amounts from Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

Authoritative accounting guidance regarding derivative 

instruments requires that all contracts considered to be 
derivative instruments be recorded on the balance sheet 
at their fair values, unless the NPNS exception applies. 
See Note 8 – Fair Value Measurements for discussion of 
our methods of assessing the fair value of derivative 
instruments. Many of our physical contracts, such as our 
coal and purchased power contracts, qualify for the NPNS 
exception to derivative accounting rules. The revenue or 
expense recorded in connection with NPNS contracts is 
recognized at the contract price upon physical delivery.  

If we determine that a contract meets the definition of 
a derivative and is not eligible for the NPNS exception, we 
review the contract to determine if it qualifies for hedge 
accounting treatment. We also consider whether gains or 
losses resulting from such derivatives qualify for 
regulatory deferral. Contracts that qualify for cash flow 
hedge accounting treatment are recorded at fair value with 

135 

 
  
  
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
  
 
  
changes in fair value charged or credited to accumulated 
OCI in the period in which the change occurs, to the 
extent the hedge is effective. To the extent the hedge is 
ineffective, the related changes in fair value are charged 
or credited to the statement of income in the period in 
which the change occurs. When the contract is settled or 
delivered, the net gain or loss is recorded in the statement 
of income.  

Derivative contracts that qualify for regulatory deferral 

are recorded at fair value, with changes in fair value 
recorded as regulatory assets or regulatory liabilities in the 
period in which the change occurs. Regulatory assets or 
regulatory liabilities are amortized to the statement of 
income as related losses and gains are reflected in rates 
charged to customers.  

Certain derivative contracts are entered into on a 
regular basis as part of our risk management program but 
do not qualify for the NPNS exception, hedge accounting, 
or regulatory deferral accounting. Such contracts are 
recorded at fair value, with changes in fair value charged 
or credited to the statement of income in the period in 
which the change occurs.  

Authoritative accounting guidance permits companies 

to offset fair value amounts recognized for the right to 
reclaim cash collateral (a receivable) or the obligation to 
return cash collateral (a liability) against fair value 
amounts recognized for derivative instruments that are 
executed with the same counterparty under the same 
master netting arrangement. The Ameren Companies did 
not elect to adopt this guidance for any eligible financial 
instruments or other items.

The following table presents the carrying value and balance sheet classification of all derivative instruments as of 

December 31, 2009:  

Balance Sheet Location 

Ameren (a) 

UE 

CIPS 

Genco 

CILCO 

IP 

Derivative assets designated as hedging instruments 
Commodity contracts: 

Power ...........................................  MTM derivative assets ............................  
Other assets ...........................................  
Total assets ...........................................  

Derivative liabilities designated as hedging instruments 
Commodity contracts: 

Power ...........................................  MTM derivative liabilities .........................  
Total liabilities .......................................  

Derivative assets not designated as hedging instruments 
Commodity contracts: 

Natural gas....................................  MTM derivative assets ............................  
Other current assets ................................  
Other assets ...........................................  
Heating oil .....................................  MTM derivative assets ............................  
Other current assets ................................  
Other assets ...........................................  
Power ...........................................  MTM derivative assets ............................  
Other assets ...........................................  
Total assets ...........................................  

Derivative liabilities not designated as hedging instruments 
Commodity contracts: 

$  20  
4  
$  24  

$ 
$ 

1  
1  

$  19  
-  
4  
39  
-  
41  
43  
10  
$  156  

$ 

$ 

-  
-  
-  

$  (b ) 
-  
$ 

$  2  
-  
-  
  22  
-  
  23  
7  
-  
$  54  

Natural gas....................................  MTM derivative liabilities .........................  
Other current liabilities .............................  
Other deferred credits and liabilities.........  
Heating oil .....................................  MTM derivative liabilities .........................  
Other current liabilities .............................  
Other deferred credits and liabilities.........  
Power ...........................................  MTM derivative liabilities .........................  
MTM derivative liabilities - affiliates .........  
Other current liabilities .............................  
Other deferred credits and liabilities.........  
Uranium ........................................  MTM derivative liabilities .........................  
Other current liabilities .............................  
Other deferred credits and liabilities.........  
Total liabilities .......................................  

$  (b ) 
  10  
6  
(b ) 
9  
3  
(b ) 
(b ) 
8  
-  
(b ) 
1  
1  
$  38  
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

$  55  
-  
44  
15  
-  
5  
37  
(b ) 
-  
4  
1  
-  
1  
$  162  

(a) 
(b)  Balance sheet line item not applicable to registrant.  

$  (b ) 
-  
-  

$ 

$ 
$ 

-  
-  

$  (b ) 
1  
-  
(b ) 
-  
-  
(b ) 
-  
$  1  

$  8  
-  
8  
-  
-  
-  
2  
  43  
-  
  95  
-  
-  
-  
$  156 

$  (b) 
-  
-  

$ 

$  (b) 
-  
$ 

$  (b) 
-  
-  
(b) 
9  
9  
(b) 
-  
$  18  

$  (b) 
1  
-  
(b) 
3  
1  
(b) 
(b) 
-  
-  
(b) 
-  
-  
  $    5  

$  (b ) 
-  
-  

$ 

$ 
$ 

-  
-  

$  (b ) 
2  
1  
(b ) 
4  
4  
(b ) 
-  
$  11  

$  7  
-  
8  
2  
-  
-  
1  
  19  
-  
  49  
-  
-  
-  
$  86  

$ 

$ 

$ 
$ 

$ 

$ 

(b ) 
-  
-  

-  
-  

(b ) 
1  
1  
(b ) 
-  
-  
(b ) 
-  
2  

$  17  
-  
19  
-  
-  
-  
3  
65  
-  
  145  
-  
-  
-  
$  249  

136 

  
  
  
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table presents the cumulative amount of pretax net gains (losses) on all derivative instruments in 

accumulated OCI and regulatory assets or regulatory liabilities as of December 31, 2009 and 2008:  

2009: 
Cumulative gains (losses) deferred in accumulated OCI: 

Power forwards(b) ....................................................................................  
Interest rate swaps(c)(d) ............................................................................  

Cumulative gains (losses) deferred in regulatory liabilities or assets: 

Natural gas swaps, forwards and futures contracts(e) ...............................  
Power forwards(f) .....................................................................................  
Heating oil options and swaps(g) ..............................................................  
Uranium swaps(h).....................................................................................  

2008: 
Cumulative gains (losses) deferred in accumulated OCI: 

Power forwards(b) ....................................................................................  
Interest rate swaps(c)(d) ............................................................................  

Cumulative losses deferred in regulatory assets: 

Natural gas swaps, forwards and futures contracts(e) ...............................  
Power forwards(f) .....................................................................................  

Ameren (a) 

UE 

CIPS 

Genco 

CILCO 

IP 

$     24  
(10) 

(75) 
(10) 
5  
(2) 

$  84  
(11) 

(118) 
-  

$ 

-  
-  

(13 ) 
(1 ) 
        5  
(2 ) 

$  40  
-  

(16 ) 
-  

$ 

-  
-  

(15 ) 
  (140 ) 
-  
         -  

$ 

-  
-  

(27 ) 
(56 ) 

$ 

-  
(10 ) 

-  
-  
-  
         -  

$ 

-  
(11 ) 

-  
-  

$ 

-   
-   

(12 ) 
(69 ) 
-   
        -   

$ 

-   
-   

(25 ) 
(29 ) 

$ 

$ 

-  
-  

(34) 
(213) 
-  
       -  

-  
-  

(50) 
(85) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

(a) 
(b)  Represents net gains associated with power forwards at Ameren as of December 31, 2009. The power forwards are a partial hedge of electricity price 

(c) 

(d) 

exposure through August 2012 as of December 31, 2009. Current gains of $22 million and $123 million were recorded at Ameren as of December 31, 2009 
and 2008, respectively. UE recorded current gains of $39 million as of December 31, 2008.  
Includes net gains associated with interest rate swaps at Genco that were a partial hedge of the interest rate on debt issued in June 2002. The swaps cover 
the first 10 years of debt that has a 30-year maturity, and the gain in OCI is amortized over a 10-year period that began in June 2002. The carrying value at 
December 31, 2009 and 2008, was $1 million and $2 million, respectively. Over the next twelve months, $0.7 million of the gain will be amortized.  
Includes net losses associated with interest rate swaps at Genco. The swaps were executed during the fourth quarter of 2007 as a partial hedge of interest 
rate risks associated with Genco’s April 2008 debt issuance. The loss on the interest rate swaps is being amortized over a 10-year period that began in April 
2008. The carrying value at December 31, 2009 and 2008, was a loss of $11 million and $13 million, respectively. Over the next twelve months, $1.4 million 
of the loss will be amortized.  

(e)  Represents net losses associated with natural gas swaps, forwards and futures contracts. The swaps, forwards and futures contracts are a partial hedge of 
natural gas requirements through October 2014 at IP, through March 2015 at UE and CIPS, and through October 2015 at CILCO, in each case as of 
December 31, 2009. Current gains deferred as regulatory liabilities include $1 million, $1 million, $2 million, and $1 million at UE, CIPS, CILCO and IP, 
respectively, as of December 31, 2009. Current losses deferred as regulatory assets include $8 million, $8 million, $7 million, and $17 million at UE, CIPS, 
CILCO and IP, respectively, as of December 31, 2009. Current gains deferred as regulatory liabilities include $10 million, $16 million, $17 million, and $36 
million at UE, CIPS, CILCO and IP, respectively, as of December 31, 2008.  

(f)  Represents net losses associated with power forwards. The power forwards are a partial hedge of power price exposure through December 2011 at UE and 
December 2012 at CIPS, CILCO and IP, in each case as of December 31, 2009. Current gains deferred as regulatory liabilities include $5 million at UE as of 
December 31, 2009. Current losses deferred as regulatory assets include $6 million, $45 million, $20 million, and $68 million at UE, CIPS, CILCO and IP, 
respectively, as of December 31, 2009. Current losses deferred as regulatory assets include $14 million, $7 million, and $21 million at CIPS, CILCO and IP, 
respectively, as of December 31, 2008.  

(g)  Represents net gains on heating oil options and swaps at UE. The options and swaps are a partial hedge of our transportation costs for coal through 

(h)  Represents net losses on uranium swaps at UE. The swaps are a partial hedge of our uranium requirements through November 2011 as of December 31, 

December 2013 as of December 31, 2009. Current gains deferred as regulatory liabilities include $5 million at UE as of December 31, 2009. Current losses 
deferred as regulatory assets include $9 million at UE as of December 31, 2009.  
2009. Current losses deferred as regulatory assets include $1 million at UE as of December 31, 2009.  
Derivative instruments are subject to various credit-related losses in the event of nonperformance by counterparties to 

the transaction. Exchange-traded contracts are supported by the financial and credit quality of the clearing members of 
the respective exchanges and have nominal credit risk. In all other transactions, we are exposed to credit risk. Our credit 
risk management program involves establishing credit limits and collateral requirements for counterparties, using master 
trading and netting agreements, and reporting daily exposure to senior management.  

We believe that entering into master trading and netting agreements mitigates the level of financial loss that could 

result from default by allowing net settlement of derivative assets and liabilities. We generally enter into the following 
master trading and netting agreements: (1) International Swaps and Derivatives Association agreement, a standardized 
financial natural gas and electric contract; (2) the Master Power Purchase and Sale Agreement, created by the Edison 
Electric Institute and the National Energy Marketers Association, a standardized contract for the purchase and sale of 
wholesale power; and (3) North American Energy Standards Board Inc. agreement, a standardized contract for the 
purchase and sale of natural gas. These master trading and netting agreements allow the counterparties to net settle sale 
and purchase transactions. Further, collateral requirements are calculated at a master trading and netting agreement level 
by counterparty.  

137 

  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
Concentrations of Credit Risk  

In determining our concentrations of credit risk related to derivative instruments, we review our individual 

counterparties and categorize each counterparty into one of eight groupings according to the primary business in which 
each engages. The following table presents the maximum exposure as of December 31, 2009, if counterparty groups 
were to completely fail to perform on contracts by grouping. The maximum exposure is based on the gross fair value of 
financial instruments, including NPNS contracts, which excludes collateral held, and does not consider the legally binding 
right to net transactions based on master trading and netting agreements.  

Affiliates (a) 

Ameren( b ) ..................  $   517 
UE  .............................   
- 
CIPS ...........................   
- 
Genco .........................   
- 
CILCO ........................   
- 
IP   .............................   
- 

Coal 
Producers 
$   9 
  5 
- 
  2 
  1 
- 

Electric 
Utilities 
$   23 
7 
- 
2 
- 
- 

Financial 
Companies 
$  123 
30 
1 
3 
3 
2 

Commodity 
Marketing 
Companies 
$  16 
2 
- 
1 
- 
- 

Municipalities/ 
Cooperatives 
$   165 
22 
- 
- 
- 
- 

Oil and 
Gas 
Companies 
$   11 
- 
- 
6 
- 
1 

Retail 
Companies 
$  63 
- 
- 
- 
- 
- 

Total 
$   927 
66 
1 
14 
4 
3 

(a)  Primarily comprised of Marketing Company’s exposure to Ameren Illinois Utilities related to financial contracts. The exposure is not eliminated at the 
consolidated Ameren level as it is calculated without regard to the offsetting affiliate counterparty’s liability position. See Note 14 – Related Party 
Transactions for additional information on these financial contracts.  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
The following table presents the amount of cash collateral held from counterparties as of December 31, 2009, based 

(b) 

on the contractual rights under the agreements to seek collateral and the maximum exposure as calculated under the 
individual master trading and netting agreements:  

Affiliates  

Coal 
Producers 
$  - 

Electric 
Utilities 
$  -  

Financial 
Companies 
$   7   

Commodity 
Marketing 
Companies 
$    3 

Municipalities/ 
Cooperatives 
$    - 

Oil and 
Gas 
Companies 
$   - 

Retail 
Companies 
$    - 

Total 
$ 10 

Ameren(a)  ...................  $     - 
(a)  Represents amounts held by Marketing Company. As of December 31, 2009, Ameren registrant subsidiaries held no cash collateral.  

The potential loss on counterparty exposures is reduced by all collateral held and the application of master trading 
and netting agreements. Collateral includes both cash collateral and other collateral held. Other collateral consisted of 
letters of credit in the amount of $32 million, $1 million and $1 million held by Ameren, UE and Genco, respectively, as of 
December 31, 2009. The following table presents the potential loss after consideration of collateral and application of 
master trading and netting agreements as of December 31, 2009:  

Affiliates (a) 

Ameren(b)  ...................  $  515 
UE  .............................   
- 
CIPS ...........................   
- 
Genco .........................   
- 
CILCO ........................   
- 
IP   .............................   
- 

Coal 
Producers 
$    - 
- 
- 
- 
- 
- 

Electric 
Utilities 
$  11 
5 
- 
2 
- 
- 

Financial 
Companies 
$     93 
26 
- 
- 
1 
- 

Commodity 
Marketing 
Companies 
$     3 
1 
- 
- 
- 
- 

Municipalities/ 
Cooperatives 
$   132 
21 
- 
- 
- 
- 

Oil and 
Gas 
Companies 
$   10 
- 
- 
5 
- 
1 

Retail 
Companies 
$    61 
- 
- 
- 
- 
- 

Total 
  $   825 
53 
- 
7 
1 
1 

(a)  Primarily comprised of Marketing Company’s exposure to Ameren Illinois Utilities related to financial contracts. The exposure is not eliminated at the 
consolidated Ameren level as it is calculated without regard to the offsetting affiliate counterparty’s liability position. See Note 14 – Related Party 
Transactions for additional information on these financial contracts.  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(b) 

138 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Derivative Instruments with Credit Risk-Related Contingent Features  

Our commodity contracts contain collateral provisions tied to the Ameren Companies’ credit ratings. If we were to 
experience an adverse change in our credit ratings, or if a counterparty with reasonable grounds for uncertainty regarding 
performance of an obligation requested adequate assurance of performance, additional collateral postings might be 
required. The following table presents, as of December 31, 2009, the aggregate fair value of all derivative instruments with 
credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of 
additional collateral required to be posted with counterparties. The additional collateral required is the net liability position 
allowed under the master trading and netting agreements, assuming (1) the credit risk-related contingent features 
underlying these agreements were triggered on December 31, 2009, and (2) those counterparties with rights to do so 
requested collateral:  

Cash 
Collateral Posted 
Ameren(c)  ..............................................................................  
$   61 
UE  ........................................................................................  
8 
CIPS ......................................................................................  
3 
Genco ....................................................................................  
- 
CILCO ...................................................................................  
- 
IP   ........................................................................................  
  11 
(a)  Prior to consideration of master trading and netting agreements and including NPNS contract exposures.  
(b)  As collateral requirements with certain counterparties are based on master trading and netting agreements, the aggregate amount of additional collateral 

Aggregate Amount of  Additional 
Collateral Required(b) 
$   367 
  129 
29 
48 
44 
52 

Aggregate Fair Value of 
Derivative Liabilities(a) 
$   500 
  151 
41 
60 
56 
71 

required to be posted is determined after consideration of the effects of such agreements.  
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(c) 

Cash Flow Hedges  

The following table presents the pretax net gain or loss associated with derivative instruments designated as cash 

flow hedges for the year ended December 31, 2009:  

Derivatives in 
Cash Flow 
Hedging 
Relationship 

Amount of 
Gain (Loss)  
Recognized in OCI 
on Derivatives(a) 

Location of (Gain) Loss 
Reclassified from 
Accumulated OCI into 
Income(b)  

Amount of 
(Gain) Loss  
Reclassified from 
Accumulated OCI 
into Income(b) 

Location of Gain  (Loss) 
Recognized in Income  on 
Derivatives(c) 

Amount of Gain 
(Loss) Recognized 
in Income on 
Derivatives(c)  

Ameren:(d)  

Power .....................................  
Interest rate(e) ..........................  

Power .....................................  

UE: 

Genco: 

$  41   
-   

(21 ) 

Operating Revenues –
 Electric 
Interest Charges 

Operating Revenues –
 Electric 

$    (101) 

(f) 

(19) 

 Operating Revenues –
 Electric 
 Interest Charges 
 Operating Revenues –
 Electric 
 Interest Charges 

$ 

(16 ) 
-   

         2   

-   

Interest Charges 

Interest rate(e) ..........................  
(a)  Effective portion of gain (loss).  
(b)  Effective portion of (gain) loss on settlements.  
(c) 
(d) 
(e)  Represents interest rate swaps settled in prior periods. The cumulative gain and loss on the interest rate swaps is being amortized into income over a 10-

Ineffective portion of gain (loss) and amount excluded from effectiveness testing.  
Includes amounts from Ameren registrants and nonregistrant subsidiaries.  
year period.  
Less than $1 million.  

-   

(f) 

(f) 

139 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
  
  
  
  
 
 
 
  
  
  
  
  
 
 
  
  
  
  
  
 
 
 
  
Other Derivatives  

The following table represents the net change in market value associated with derivatives not designated as hedging 

instruments for the year ended December 31, 2009:  

Ameren(a)  

UE 

Genco 

CILCO 

Derivatives Not Designated 
as Hedging Instruments 

Location of Gain (Loss) 
Recognized in Income on 
Derivatives 

Natural gas (generation) .......................................   Operating Expenses - Fuel.............................     
Natural gas (resale) ..............................................   Operating Revenues - Gas.............................     
Heating oil ............................................................   Operating Expenses - Fuel.............................     
Power ...................................................................   Operating Revenues - Electric .......................     
SO2 emission allowances .....................................   Operating Expenses - Fuel.............................   

Natural gas (generation) .......................................   Operating Expenses - Fuel.............................     
Heating oil ............................................................   Operating Expenses - Fuel.............................     

Total  

Natural gas (generation) .......................................   Operating Expenses - Fuel.............................     
Heating oil ............................................................   Operating Expenses - Fuel.............................     
SO2 emission allowances .....................................   Operating Expenses - Fuel.............................     

 Total  

Natural gas (resale) ..............................................   Operating Revenues - Gas.............................     
Heating oil ............................................................   Operating Expenses - Fuel.............................     

 Total  

 Total  

Amount of Gain (Loss) 
Recognized in Income 
on Derivatives 

$ 

5   
6   
52   
(25 ) 
1   
$     39   
2   
$ 
25   
$  27   
(1 ) 
$ 
17   
1   
$  17   
6   
$ 
4   
$  10   

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

Derivatives Subject to Regulatory Deferral  

The following table represents the net change in 
market value associated with derivatives that qualify for 
regulatory deferral for the year ended December 31, 2009:  

Derivatives 
Subject to  
Regulatory 
Deferral 

UE 

Ameren(a)   Natural gas ......................................  
Heating oil .......................................  
Power ..............................................  
Uranium...........................................  
Total 
Natural gas ......................................  
Heating oil .......................................  
Power ..............................................  
Uranium...........................................  
Total 
Natural gas ......................................  
Power ..............................................  
Total 
Natural gas ......................................  
Power ..............................................  
Total 
Natural gas ......................................  
Power ..............................................  
Total 

CILCO 

CIPS 

IP 

(a) 

Includes intercompany eliminations.  

$ 
$ 

Amount of Gain 
(Loss) Recognized 
in Regulatory 
Liabilities or 
Assets on 
Derivatives 
41  
$ 
5  
(8 ) 
(2 ) 
36  
3  
5  
(1 ) 
(2 ) 
5  
12  
(85 ) 
(73 ) 
11  
(38 ) 
(27 ) 
$ 
$         15   
(127 ) 
(112 ) 

$ 
$ 

$ 
$ 

$ 

UE, CIPS, CILCO and IP believe derivative gains and 

losses deferred as regulatory assets and regulatory 
liabilities are probable of recovery or refund through future 
rates charged to customers. Regulatory assets and 
regulatory liabilities are amortized to operating expenses 
as related losses and gains are reflected in revenue 
through rates charged to customers. Therefore, gains and 
losses on these derivatives have no effect on operating 
income.  

As part of the electric rate order issued by the MoPSC 
in January 2009, UE was granted permission to implement 
a FAC, which was effective March 1, 2009. UE uses 
derivatives to mitigate its exposure to changing prices of 
fuel for generation and related transportation costs, and 
for power price volatility. In connection with the MoPSC’s 
approval of the FAC, gains and losses associated with 
these types of derivatives are considered refundable to, or 
recoverable from, customers and thus represent 
regulatory liabilities or regulatory assets, respectively. 
During the first quarter of 2009, UE recorded a net 
regulatory liability of $5 million associated with the 
reclassification of unrealized gains and losses previously 
recorded in accumulated OCI and earnings related to 
open UE derivative positions with delivery dates 
subsequent to March 1, 2009. The reclassification of 
previously recorded unrealized gains associated with the 
derivatives resulted in a $47 million reduction of 
accumulated OCI. The reclassification of previously 
recognized unrealized losses resulted in a $42 million 
increase in pretax earnings, of which $38 million offset fuel 
expense and $4 million increased operating revenues. 
See Note 2 – Rate and Regulatory Matters for additional 
information on the FAC.

140 

  
 
 
 
 
 
 
 
 
 
  
  
  
 
  
  
 
  
  
 
 
 
 
 
   
  
 
 
 
   
  
  
  
 
 
 
 
   
  
 
 
 
  
  
  
 
 
 
 
 
  
 
  
 
 
 
 
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
As part of the 2007 Illinois Electric Settlement 

Agreement and the 2009 RFP process, the Ameren Illinois 
Utilities entered into financial contracts with Marketing 
Company. These financial contracts are derivative 
instruments. They are accounted for as cash flow hedges 
by Marketing Company and as derivatives subject to 
regulatory deferral by the Ameren Illinois Utilities. 
Consequently, the Ameren Illinois Utilities and Marketing 
Company record the fair value of the contracts on their 
respective balance sheets and the changes to the fair 
value in regulatory assets or liabilities by the Ameren 
Illinois Utilities and OCI by Marketing Company. In 
Ameren’s consolidated financial statements, all financial 
statement effects of the derivative instruments are 
eliminated. See Note 14 – Related Party Transactions 
under Part II, Item 8 of the Form 10-K for additional 
information on these financial contracts.  

NOTE 8 – FAIR VALUE MEASUREMENTS  

Fair value is defined as the exchange price that would 

be received for an asset or paid to transfer a liability (an 
exit price) in the principal or most advantageous market 
for the asset or liability in an orderly transaction between 
market participants on the measurement date. We use 
various methods to determine fair value, including market, 
income, and cost approaches. With these approaches, we 
adopt certain assumptions that market participants would 
use in pricing the asset or liability, including assumptions 
about market risk or the risks inherent in the inputs to the 
valuation. Inputs to valuation can be readily observable, 
market-corroborated, or unobservable. We use valuation 
techniques that maximize the use of observable inputs 
and minimize the use of unobservable inputs. Authoritative 
accounting guidance established a fair value hierarchy 
that prioritizes the inputs used to measure fair value. All 
financial assets and liabilities carried at fair value are 
classified and disclosed in one of the following three 
hierarchy levels:  
Level 1: Inputs based on quoted prices in active markets 
for identical assets or liabilities. Level 1 assets and 
liabilities are primarily exchange-traded derivatives and 
assets, including U.S. treasury securities and listed equity 
securities, such as those held in UE’s Nuclear 
Decommissioning Trust Fund.  
Level 2: Market-based inputs corroborated by third-party 
brokers or exchanges based on transacted market data. 
Level 2 assets and liabilities include certain assets held in 
UE’s Nuclear Decommissioning Trust Fund, including 
corporate bonds and other fixed-income securities, and 
certain over-the-counter derivative instruments, including 
natural gas swaps and financial power transactions. 
Derivative instruments classified as Level 2 are valued 
using corroborated observable inputs, such as pricing 
services or prices from similar instruments that trade in 
liquid markets. Our development and corroboration 
process entails obtaining multiple quotes or prices from 

outside sources. To derive our forward view to price our 
derivative instruments at fair value, we average the 
midpoints of the bid/ask spreads. To validate forward 
prices obtained from outside parties, we compare the 
pricing to recently settled market transactions. 
Additionally, a review of all sources is performed to 
identify any anomalies or potential errors. Further, we 
consider the volume of transactions on certain trading 
platforms in our reasonableness assessment of the 
averaged midpoint.  
Level 3: Unobservable inputs that are not corroborated by 
market data. Level 3 assets and liabilities are valued 
based on internally developed models and assumptions or 
methodologies that use significant unobservable inputs. 
Level 3 assets and liabilities include derivative instruments 
that trade in less liquid markets, where pricing is largely 
unobservable, including the financial contracts entered 
into between the Ameren Illinois Utilities and Marketing 
Company. We value Level 3 instruments by using pricing 
models with inputs that are often unobservable in the 
market, as well as certain internal assumptions. Our 
development and corroboration process entails obtaining 
multiple quotes or prices from outside sources. As a part 
of our reasonableness review, an evaluation of all sources 
is performed to identify any anomalies or potential errors.  
We perform an analysis each quarter to determine the 

appropriate hierarchy level of the assets and liabilities 
subject to fair value measurements. Financial assets and 
liabilities are classified in their entirety according to the 
lowest level of input that is significant to the fair value 
measurement. All assets and liabilities whose fair value 
measurement is based on significant unobservable inputs 
are classified as Level 3.  

In accordance with applicable authoritative accounting 

guidance, we consider nonperformance risk in our 
valuation of derivative instruments by analyzing the credit 
standing of our counterparties and considering any 
counterparty credit enhancements (e.g., collateral). The 
guidance also requires that the fair value measurement of 
liabilities reflect the nonperformance risk of the reporting 
entity, as applicable. Therefore, we have factored the 
impact of our credit standing as well as any potential credit 
enhancements into the fair value measurement of both 
derivative assets and derivative liabilities. Included in our 
valuation, and based on current market conditions, is a 
valuation adjustment for counterparty default derived from 
market data such as the price of credit default swaps, 
bond yields, and credit ratings. Ameren recorded losses 
totaling less than $1 million in 2009 related to valuation 
adjustments for counterparty default risk. At December 31, 
2009, the counterparty default risk valuation adjustment 
related to net derivative (assets) liabilities totaled $3 
million, $- million, $6 million, $- million, $8 million, and $10 
million for Ameren, UE, CIPS, Genco, CILCO and IP, 
respectively.

141 

  
  
The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value 

on a recurring basis as of December 31, 2009:  

Quoted Prices in 
Active Markets for 
Identified Assets 
(Level 1) 

Significant Other 
Observable Inputs 
(Level 2) 

Significant Other 
Unobservable Inputs 
(Level 3) 

Derivative assets(b) ...................................................  
Nuclear Decommissioning Trust Fund(c) ...................  
Derivative assets......................................................  
Nuclear Decommissioning Trust Fund(c) ...................  
Derivative assets(b) ...................................................  
Derivative assets(b) ...................................................  
Derivative assets(b) ...................................................  
Derivative assets(b) ...................................................  

Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  

$  13 
  232 
1 
    232 
- 
- 
- 
- 

$  26 
8 
- 
- 
- 
1 

$ 

3 
60 
2 
     60 
- 
- 
- 
- 

$ 

2 
2 
- 
- 
- 
- 

$  164 
- 
51 
- 
1 
18 
11 
2 

$   135 
28 
  156 
5 
86 
  248 

Total 

$  180 
  292 
54 
  292 
1 
18 
11 
2 

$   163 
38 
  156 
5 
86 
  249 

Assets: 
Ameren(a)  

UE 

CIPS 
Genco 
CILCO 
IP 
Liabilities: 
Ameren(a)  
UE 
CIPS 
Genco 
CILCO 
IP 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

(a) 
(b)  The derivative asset and liability balances are presented net of counterparty credit considerations.  
(c)  Balance excludes $1 million of receivables, payables, and accrued income, net.  

The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value 

on a recurring basis as of December 31, 2008:  

Quoted Prices in 
Active Markets for 
Identified Assets 
(Level 1) 

Significant Other 
Observable Inputs 
(Level 2) 

Significant Other 
Unobservable Inputs 
(Level 3) 

Other current assets .................................................  
Derivative assets(b) ...................................................  
Nuclear Decommissioning Trust Fund(c) ...................  
Derivative assets ......................................................  
Nuclear Decommissioning Trust Fund(c) ...................  

Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  
Derivative liabilities(b) ................................................  

$ 

- 
1 
    164 
- 
  164 

$ 

9 
- 
- 
- 
4 
- 

$ 

$ 

    - 
19 
81 
14 
81 

6 
3 
- 
- 
- 
- 

$ 

6 
234 
2 
36 
2 

$    219 
31 
84 
1 
55 
134 

Total 

$ 

6 
254 
247 
50 
247 

$   234 
34 
84 
1 
59 
134 

Assets: 
Ameren(a)  

UE 

Liabilities: 
Ameren(a)  
UE 
CIPS 
Genco 
CILCO 
IP 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

(a) 
(b)  The derivative asset and liability balances are presented net of counterparty credit considerations.  
(c)  Balance excludes ($8) million of receivables, payables, and accrued income, net.  

142 

  
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table summarizes the changes in the fair value associated with financial assets and liabilities classified 

as Level 3 in the fair value hierarchy for the year ended December 31, 2009:  

Realized and Unrealized Gains 
(Losses)  

Included in 
Regulatory 
Assets/ 
Liabilities 
-   
$ 
(85 ) 
$ 
8   
(161 ) 
-   
(77 ) 
(264 ) 
-   

$ 

Included 
in OCI 
-   
$ 
$  58   
  37   
  (10 ) 
-   
(5 ) 
  (15 ) 
-   
$ 

Included in 
Earnings(a) 

-  
$ 
$  75  
-  
-  
4  
(18) 
-  
-  

$ 

Total 
Realized 
and 
Unrealized 
Gains 
(Losses) 
-  
$ 
$  48  
45  
(171) 
4  
(100) 
(279) 
-  

$ 

Purchases, 
Issuances, 
and Other 
Settlements, 
Net 
-  
$ 
$  35  
(6) 
  100  
10  
80  
  167  
(2) 
$ 

Net 
Transfers 
into (out of) 
Level 3 
(6) 
$ 
$  (69) 
(21) 
-  
-  
-  
-  
$      -  

Ending 
Balance at 
December 31, 
2009 
$ 
$ 

-  
29  
23  
(155) 
13  
(75) 
(246) 
-  

$ 

$ 

Change in 
Unrealized 
Gains (Losses) 
Related to 
Assets/ 
Liabilities Still 
Held at 
December 31, 
2009 
$ 
$ 

-  
(2) 
2  
(107) 
-  
(54) 
(172) 
-  

Other current assets  Ameren ..........  $ 
Net derivative  
    contracts 

Beginning 
Balance at 
January 1, 
2009 
6  
Ameren ..........  $  15  
5  
UE .................   
(84 ) 
CIPS ..............   
(1 ) 
Genco ............   
(55 ) 
CILCO ...........   
(134 ) 
IP ...................   
2  
Ameren ..........  $ 

Nuclear 

Decommissioning 
Trust Fund 

UE .................   

2  

-  

-   

-   

-  

(2) 

-  

-  

-  

(a)  See Note 7 – Derivative Financial Instruments for additional information regarding the recording of net gains and losses on derivatives to the statement of 

income.  
The following table summarizes the changes in the fair value associated with financial assets and liabilities classified 

as Level 3 in the fair value hierarchy for the year ended December 31, 2008:  

Realized and Unrealized Gains 
(Losses)  

Included in 
Regulatory 
Assets/ 
Liabilities 
-  
(35 ) 
13  
(127 ) 
-  
(43 ) 
(209 ) 
-  

Included 
in OCI 
-    $ 
$ 
$   13    $ 
  13   
-   
-   
-   
-   
-    $ 

$ 

Included in 
Earnings 
-  
$ 
$  (18) 
1  
(1) 
(2) 
(34) 
(1) 
$      -  

Total 
Realized 
and 
Unrealized 
Gains 
(Losses) 
-  
$ 
(40 ) 
$ 
27  
(128 ) 
(2 ) 
(77 ) 
(210 ) 
-  

$ 

Purchases, 
Issuances, 
and Other 
Settlements, 
Net 
$ 
$ 

-  
8  
(42) 
6  
-  
1  
21  
(3) 

$ 

Change in 
Unrealized 
Gains (Losses) 
Related to 
Assets/ 
Liabilities Still 
Held at 
December 31, 
2008 
-  
$ 
$  (206 ) 
(6 ) 
(106 ) 
-  
(62 ) 
(174 ) 
$        -   

Net 
Transfers 
into (out of) 
Level 3 
$  6 
$   28 
  17 
- 
- 
- 
- 
- 

$ 

  $ 
  $ 

Ending 
Balance at 
December 31, 
2008 
6  
15  
5  
(84 ) 
(1 ) 
(55 ) 
(134 ) 
2  

  $ 

Other current assets  Ameren ..........  $ 
Net derivative 
    contracts 

Beginning 
Balance at 
January 1, 
2008 
- 
Ameren ..........  $  19 
UE ..................   
3 
CIPS ..............   
38 
Genco ............   
1 
CILCO ............   
21 
IP ...................   
  55 
Ameren ..........  $ 
5 

Nuclear 

Decommissioning  
Trust Fund 

UE ..................   

5 

-  

-   

-  

-  

(3) 

- 

2  

-  

Transfers in or out of Level 3 represent either (1) existing assets and liabilities that were previously categorized as a 
higher level but were recategorized to Level 3 because the inputs to the model became unobservable during the period, or 
(2) existing assets and liabilities that were previously classified as Level 3 but were recategorized to a higher level 
because the lowest significant input became observable during the period. Transfers between Level 2 and Level 3 were 
primarily caused by changes in availability of financial power trades observable on electronic exchanges from previous 
periods. Any reclassifications are reported as transfers in/out of Level 3 at the fair value measurement reported at the 
beginning of the period in which the changes occur.  

See Note 11 – Retirement Benefits for the fair value hierarchy tables detailing Ameren’s pension and postretirement 
plan assets as of December 31, 2009, as well as a table summarizing the changes in Level 3 plan assets during 2009.  

The Ameren Companies’ carrying amounts of cash and cash equivalents, accounts receivable, short-term borrowings, 

and accounts payable approximate fair value because of the short-term nature of these instruments. The estimated fair 
value of long-term debt and preferred stock is based on the quoted market prices for same or similar issues for companies 
with similar credit profiles or on the current rates offered to the Ameren Companies for similar financial instruments.  

143 

  
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
   
 
  
 
 
 
 
 
 
 
   
 
  
 
 
 
 
 
 
 
   
 
  
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
   
 
  
The following table presents the carrying amounts and estimated fair values of our long-term debt and preferred stock 

at December 31, 2009 and 2008:  

Ameren:(a)(b)  
Long-term debt and capital lease obligations (including current portion) ...............  
Preferred stock ....................................................................................................  
UE: 
Long-term debt and capital lease obligations (including current portion) ...............   
Preferred stock ....................................................................................................  
CIPS: 
Long-term debt (including current portion) ............................................................  
Preferred stock ....................................................................................................  
Genco: 
Long-term debt (including current portion) ............................................................  
CILCO: 
Long-term debt (including current portion) ............................................................  
Preferred stock ....................................................................................................  
IP: 
Long-term debt (including current portion) ............................................................  
Preferred stock ....................................................................................................  

2009 
Carrying Amount 

Fair Value 

Carrying Amount 

Fair Value 

2008 

$  7,317 
195 

$ 4,022 
113 

$  421 
50 

$   7,719 
150 

$  4,152 
95 

$ 

436 
31 

$   6,934 
195 

$  3,677 
113 

$ 

421 
50 

$   6,144 
100 

$  3,156 
62 

$ 

371 
22 

$ 1,023 

$  1,046 

$ 

774 

$ 

661 

$  279 
19 

$ 1,147 
46 

$ 

311 
15 

$  1,295 
35 

$ 

279 
19 

$  1,400 
46 

$ 

255 
10 

$  1,326 
24 

Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

(a) 
(b)  Preferred stock along with the 20% noncontrolling interest of EEI is recorded in Noncontrolling Interests on the balance sheet.  

NOTE 9 – NUCLEAR DECOMMISSIONING TRUST FUND INVESTMENTS  

UE has investments in debt and equity securities that are held in a trust fund for the purpose of funding the 

decommissioning of its Callaway nuclear plant. See Note 16 – Callaway Nuclear Plant for additional information. We have 
classified these investments as available for sale, and we have recorded all such investments at their fair market value at 
December 31, 2009, and 2008.  

Investments in the nuclear decommissioning trust fund have a target allocation of 60% to 70% in equity securities, 
with the balance invested in debt securities. Due to market conditions in 2008, the equity securities weighting was less 
than targeted levels at December 31, 2008. In January 2009, UE rebalanced its investments to align with its targeted 
equity securities weighting.  

The following table presents proceeds from the sale of investments in UE’s nuclear decommissioning trust fund and 
the gross realized gains and losses resulting from those sales for the years ended December 31, 2009, 2008, and 2007:  

Proceeds from sales .............................................................................................................................................................  
Gross realized gains .............................................................................................................................................................  
Gross realized losses ............................................................................................................................................................  

2009 
$  380  
5   
10   

2008 
$   497   
5   
8   

2007 
$   128 
4 
3 

Net realized and unrealized gains and losses are deferred and recorded as regulatory assets or regulatory liabilities 

on Ameren’s and UE’s Consolidated Balance Sheets. This reporting is consistent with the method used to account for the 
decommissioning costs recovered in rates. Gains or losses associated with assets in the trust fund could result in lower or 
higher funding requirements for decommissioning costs, which are expected to be reflected in electric rates paid by UE’s 
customers. See Note 2 – Rate and Regulatory Matters.  

144 

  
 
 
 
 
 
  
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table presents the costs and fair values of investments in debt and equity securities in UE’s nuclear 

Cost 

Gross Unrealized Gain 

Gross Unrealized Loss 

decommissioning trust fund at December 31, 2009 and 2008:  
Security Type 
2009: 
Debt securities ..................................................................  
Equity securities ................................................................  
Cash .................................................................................  
Other(b)  .............................................................................  
Total .................................................................................  
2008: 
Debt securities ..................................................................  
Equity securities ................................................................  
Cash .................................................................................  
Other(b)  .............................................................................  
Total .................................................................................  
(a)  Amount less than $1 million.  
(b)  Represents payables relating to pending security purchases, net of receivables related to pending securities sales and interest receivables.  
The following table presents the costs and fair values of investments in debt securities in UE’s nuclear 

$  95  
  137  
(a ) 
1  
$   233  

$  109  
  123  
2  
(8 ) 
$  226  

$  3 
  72 
- 
- 
$   75 

$  5 
  40 
- 
- 
$  45 

$  1 
  14 
- 
- 
$   15 

$  3 
  29 
- 
- 
$  32 

decommissioning trust fund according to their contractual maturities at December 31, 2009:  

Fair Value 

$  97  
  195  
(a) 
1  
$   293  

$  111  
  134  
2  
(8) 
$  239  

Less than 5 years .................................................................................................................................................................  
5 years to 10 years ...............................................................................................................................................................  
Due after 10 years ................................................................................................................................................................  
Total .....................................................................................................................................................................................  

Cost 
$   50 
  25 
  20 
$  95 

Fair Value 
$   51 
  26 
  20 
$  97 

We have unrealized losses relating to certain available-for-sale investments included in our decommissioning trust 
fund, recorded as regulatory assets as discussed above. Decommissioning will not occur until the operating license for 
our nuclear facility expires. UE intends to submit a license extension application to the NRC to extend the Callaway 
nuclear plant’s operating license to 2044. The following table presents the fair value and the gross unrealized losses of 
the available-for-sale securities held in UE’s nuclear decommissioning trust fund. They are aggregated by investment 
category and the length of time that individual securities have been in a continuous unrealized loss position at 
December 31, 2009:  

Debt securities ..............................................................................  
Equity securities ............................................................................  
Total .............................................................................................  
(a)  Amount less than $1 million.  

NOTE 10 – PREFERRED STOCK  

Less than 12 Months 
Gross 
Unrealized 
Losses 
$   1 
  2 
$  3 

Fair Value 
$   26 
4 
$  30 

12 Months or Greater 
Gross 
Unrealized 
Losses 
$  (a) 
  12  
$   12  

Fair Value 
$  1 
  27 
$   28 

Total 

Fair Value 
$  27 
  31 
$   58 

Gross 
Unrealized 
Losses 
$  1 
  14 
$   15 

All classes of UE’s, CIPS’, CILCO’s and IP’s preferred stock are entitled to cumulative dividends and have voting 
rights. The following table presents the outstanding preferred stock of UE, CIPS, CILCO and IP that is not subject to 
mandatory redemption. The preferred stock is redeemable, at the option of the issuer, at the prices presented as of 
December 31, 2009 and 2008:  

UE: 
Without par value and stated value of $100 per share, 25 million shares authorized 

$3.50 Series 
$3.70 Series 
$4.00 Series 
$4.30 Series 
$4.50 Series 
$4.56 Series 
$4.75 Series 
$5.50 Series A 
$7.64 Series 
Total ...................................................................................................................................    

130,000 shares .........................................................................  
  40,000 shares .........................................................................  
150,000 shares .........................................................................  
  40,000 shares .........................................................................  
213,595 shares .........................................................................  
200,000 shares .........................................................................  
  20,000 shares .........................................................................  
  14,000 shares .........................................................................  
330,000 shares .........................................................................  

Redemption Price (per share) 

2009 

2008 

$  110.00 
    104.75 
    105.625 
    105.00 
     110.00(a) 
    102.47 
    102.176 
    110.00 
     101.27(b) 

$  13 
4 
15 
4 
21 
20 
2 
1 
33 
$  113 

$  13 
4 
15 
4 
21 
20 
2 
1 
33 
$   113 

145 

  
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Redemption Price (per share) 

2009 

2008 

CIPS: 
With par value of $100 per share, 2 million shares authorized 

4.00% Series 
150,000 shares ......................................................................  
4.25% Series 
  50,000 shares ......................................................................  
4.90% Series 
  75,000 shares ......................................................................  
4.92% Series 
  50,000 shares ......................................................................  
5.16% Series 
  50,000 shares ......................................................................  
6.625% Series 
125,000 shares ......................................................................  
Total .............................................................................................................................  

CILCO: 
With par value of $100 per share, 1.5 million shares authorized 

$   101.00 
  102.00 
  102.00 
  103.50 
  102.00 
  100.00 

4.50% Series 
4.64% Series 
Total .............................................................................................................................  

111,264 shares ..................................................................................................................  
  79,940 shares ..................................................................................................................  

$   110.00 
  102.00 

IP: 
With par value of $50 per share, 5 million shares authorized 

4.08% Series 
4.20% Series 
4.26% Series 
4.42% Series 
4.70% Series 
7.75% Series 
Total .............................................................................................................................  
Less: Shares of IP preferred stock owned by Ameren ........................................................  
Total Ameren .....................................................................................................................  

225,510 shares ..................................................................................................................  
143,760 shares ..................................................................................................................  
104,280 shares ..................................................................................................................  
102,190 shares ..................................................................................................................  
145,170 shares ..................................................................................................................  
191,765 shares ..................................................................................................................  

$     51.50 
52.00 
51.50 
51.50 
51.50 
50.00 

$  15 
5 
8 
5 
5 
12 
$  50 

$  11 
8 
$  19 

$  12 
7 
5 
5 
7 
10 
$  46 
(33) 
$  195 

$  15  
5  
8  
5  
5  
12  
$  50  

$  11  
8  
$  19  

$  12  
7  
5  
5  
7  
10  
$  46  
(33 ) 
$  195  

In the event of voluntary liquidation, $105.50.  

(a) 
(b)  Redemption price as of December 31, 2009. Declining to $100 per share in 2012.  

In addition, the Ameren Companies have classes of preferred stock that are authorized but no shares of which are 
outstanding. Ameren has 100 million shares of $0.01 par value preferred stock authorized, with no shares outstanding. 
CIPS has 2.6 million shares of no par value preferred stock authorized, with no shares outstanding. UE has 7.5 million 
shares of $1 par value preference stock authorized, with no such preference stock outstanding. CILCO has 2 million 
shares of no par value preference stock authorized, with no such preference stock outstanding. CILCO also has 
3.5 million shares of no par value preferred stock authorized, with no shares outstanding. IP has 5 million shares of no par 
value serial preferred stock authorized and 5 million shares of no par value preference stock authorized, with no such 
serial preferred stock and preference stock outstanding.  

NOTE 11 – RETIREMENT BENEFITS  

The primary objective of the Ameren retirement plan and postretirement benefit plans is to provide eligible employees 

with pension and postretirement health care and life insurance benefits. We offer defined benefit and postretirement 
benefit plans covering substantially all employees of UE, CIPS, CILCO, IP, EEI, and Ameren Services and certain 
employees of Resources Company and its subsidiaries, including Genco. Ameren uses a measurement date of 
December 31 for its pension and postretirement benefit plans.  

The following table presents the benefit liability recorded on the balance sheets of each of the Ameren Companies as 

of December 31, 2009:  
Ameren(a)  ..................................................................................................................................................................................................................   $  1,171 
UE  ............................................................................................................................................................................................................................  
403 
CIPS ..........................................................................................................................................................................................................................  
59 
Genco ........................................................................................................................................................................................................................  
51 
CILCO .......................................................................................................................................................................................................................  
194 
IP   ............................................................................................................................................................................................................................  
238 

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

146 

 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Ameren recognizes the underfunded status of its pension and postretirement plans as a liability on its balance sheet, 

with offsetting entries to accumulated OCI and regulatory assets, in accordance with authoritative accounting guidance. 
The following table presents the funded status of our pension and postretirement benefit plans as of December 31, 2009 
and 2008. It also provides the amounts included in regulatory assets and accumulated OCI at December 31, 2009 and 
2008, that have not been recognized in net periodic benefit costs.  

Accumulated benefit obligation at end of year ..........................................  
Change in benefit obligation: 

Net benefit obligation at beginning of year ..........................................  
Service cost .......................................................................................  
Interest cost .......................................................................................  
Plan amendments ..............................................................................  
Participant contributions .....................................................................  
Actuarial (gain) loss ............................................................................  
Benefits paid ......................................................................................  
Federal subsidy on benefits paid ........................................................   
Net benefit obligation at end of year .........................................................  
Change in plan assets: 

Fair value of plan assets at beginning of year .....................................  
Actual return on plan assets ...............................................................  
Employer contributions .......................................................................  
Federal subsidy on benefits paid ........................................................  
Participant contributions .....................................................................  
Benefits paid ......................................................................................  
Fair value of plan assets at end of year ....................................................  
Funded status – deficiency.......................................................................   
Accrued benefit cost at December 31 .......................................................  
Amounts recognized in the balance sheet consist of: 

Current liability ...................................................................................  
Noncurrent liability ..............................................................................  
Total ...................................................................................................  

Amounts recognized in regulatory assets consist of: 

Net actuarial loss ................................................................................  
Prior service cost (credit) ....................................................................  
Transition obligation ...........................................................................  

Amounts recognized in accumulated OCI consist of: 

Net actuarial loss ................................................................................  
Prior service cost (credit) ....................................................................  
Total ...................................................................................................  

2009 

Pension  Benefits(a) 
$   3,041  

Postretirement 
Benefits(a)  
(b ) 
$ 

2008 

Pension  Benefits(a) 
$  3,051  

Postretirement 
Benefits(a)  
(b) 
$ 

$  3,303  
68  
186  
-  
-  
(133) 
(169) 
(b) 
  3,255  

  2,393  
172  
99  
-  
-  
(169) 
  2,495  
760  
760  

$ 

$ 

$ 

$ 

$ 

3  
757  
760  

487  
33  
-  

28  
8  
556  

$   1,182  
19  
66  
-  
17  
(74 ) 
(72 ) 
5  
1,143  

593  
140  
49  
5  
17  
(72 ) 
732  
411  
411  

3  
408  
411  

167  
(37 ) 
9  

25  
(13 ) 
151  

$ 

$ 

$ 

$ 

$ 

$  3,076  
60  
186  
2  
-  
145  
(166 ) 
(b ) 
  3,303  

  2,698  
(205 ) 
66  
-  
-  
(166 ) 
  2,393  
910  
$  910  

$ 

2  
908  
$  910  

$  597  
40  
-  

57  
10  
$  704  

$   1,253  
18  
70  
-  
14  
(105) 
(73) 
5  
  1,182  

787  
(187) 
47  
5  
14  
(73) 
593  
589  
589  

2  
587  
589  

327  
(40) 
12  

43  
(16) 
326  

$ 

$ 

$ 

$ 

$ 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

(a) 
(b)  Not applicable.  

The market value of plan assets in 2008 declined by 7% and 26% for the pension and postretirement benefit plans, 
respectively. In 2008, investment losses in Ameren’s pension plan were partially offset by a gain on interest rate swaps, 
which had a notional value of $700 million at December 31, 2008. The swaps were intended to mitigate the impacts on the 
funded status of the plan resulting from decreases in the discount rate in the calculation of the pension liability. During 
2008, U.S. Treasury yields declined significantly, which resulted in Ameren’s pension plan recognizing a $336 million net 
gain from its interest rate swaps. Ameren closed its interest rate swap position in early 2009. Prior to closing its swap 
position, U.S. Treasury yields increased, which resulted in Ameren’s pension plan recognizing a $74 million net loss in 
2009. Ameren’s postretirement benefit plans did not have a similar interest rate hedge.  

The following table presents the assumptions used to determine our benefit obligations at December 31, 2009 and 

2008:  

Discount rate at measurement date ..................................................................................    
Increase in future compensation ......................................................................................    
Medical cost trend rate (initial)..........................................................................................    
Medical cost trend rate (ultimate) .....................................................................................    
Years to ultimate rate .......................................................................................................    

Pension Benefits 
2008 
2009 
5.75% 
5.75% 
3.50   
4.00   
-   
-   
-   
-   
-   
-   

Postretirement Benefits 
2008 
2009 
5.75% 
5.75% 
3.50   
4.00   
6.50   
7.00   
5.00   
5.00   
3 years   
4 years   

147 

  
 
 
 
 
 
  
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Investment Strategy and Policies  

Ameren manages plan assets in accordance with the 

“prudent investor” guidelines contained in ERISA. The 
investment committee, to the extent authority is delegated 
to it by the finance committee of Ameren’s board of 
directors, implements investment strategy and asset 
allocation guidelines for the plan assets. The investment 
committee is composed of members of senior 
management. The investment committee’s goals are 
twofold: first, to ensure that sufficient funds are available 
to provide the benefits at the time they are payable, and 
second, to maximize total return on plan assets and 
minimize expense volatility consistent with its tolerance for 
risk. Ameren delegates investment management to 
specialists in each asset class. As appropriate, Ameren 
provides the investment manager with guidelines that 
specify allowable and prohibited investment types. The 
investment committee regularly monitors manager 
performance and compliance with investment guidelines.  
The expected return on plan assets is based on 

historical and projected rates of return for current and 
planned asset classes in the investment portfolio. 
Projected rates of return for each asset class were 
estimated after an analysis of historical experience, future 
expectations, and the volatility of the various asset 
classes. After considering the target asset allocation for 
each asset class, we adjusted the overall expected rate of 
return for the portfolio for historical and expected 
experience of active portfolio management results 
compared with benchmark returns and for the effect of 
expenses paid from plan assets. The Ameren Companies 
will utilize an expected return on plan assets of 8% in 
2010. No plan assets are expected to be returned to 
Ameren during 2010.  

Ameren determines discount rate assumptions by 
using an interest rate yield curve pursuant to authoritative 
accounting guidance on the determination of discount 
rates used for defined benefit plan obligations. The yield 
curve is based on the yields of over 500 high-quality 
corporate bonds with maturities between zero and 30 
years. A theoretical spot-rate curve constructed from this 
yield curve is then used as a guide to develop a discount 
rate matching the plans’ payout structure.  

Funding  

Pension benefits are based on the employees’ years 

of service and compensation. Ameren’s pension plan is 
funded in compliance with income tax regulations and 
federal funding or regulatory requirements. As a result, 
Ameren expects to fund its pension plan at a level equal to 
the greater of the pension expense or the legally required 
minimum contribution. Considering Ameren’s assumptions 
at December 31, 2009, its investment performance in 
2009, and its pension funding policy, Ameren expects to 
make annual contributions of $75 million to $225 million in 
each of the next five years, with aggregate estimated 
contributions of $740 million. We expect UE’s, CIPS’, 
Genco’s, CILCO’s, and IP’s portion of the future funding 
requirements to be 66%, 6%, 9%, 9%, and 10%, 
respectively. These amounts are estimates. They may 
change based on actual investment performance, 
changes in interest rates, changes in our assumptions, 
any pertinent changes in government regulations, and any 
voluntary contributions. Our funding policy for 
postretirement benefits is primarily to fund the Voluntary 
Employee Beneficiary Association (VEBA) trusts to match 
the annual postretirement expense.  

The following table presents the cash contributions 
made to our defined benefit retirement plan and to our 
postretirement plans during 2009 and 2008:  

Pension Benefits 
2008 
2009 
Ameren(a)  ...................   $  99 
$   66 
UE  .............................     42 
  29 
CIPS ...........................    
6 
4 
Genco .........................    
5 
4 
CILCO ........................     12 
6 
IP   .............................     10 
9 

Postretirement 
Benefits  

2009 
$   49 
  13 
1 
- 
7 
  20 

2008 
$   47 
  10 
1 
- 
7 
  21 

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

148 

  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
Ameren’s investment committee strives to assemble a portfolio of diversified assets that does not create a significant 

concentration of risks. The investment committee develops asset allocation guidelines between asset classes, and it 
creates diversification through investments in assets that differ by type (equity, debt, real estate, private equity), duration, 
market capitalization, country, style (growth or value) and industry, among other factors. The diversification of assets is 
displayed in the target allocation table below. The investment committee also routinely rebalances the plan assets to 
adhere to the diversification goals. The investment committee’s strategy reduces the concentration of investment risk; 
however, Ameren is still subject to overall market risk. The following table presents our target allocations for 2010 and our 
pension and postretirement plans’ asset categories as of December 31, 2009 and 2008.  

Asset 
Category 

Target Allocation 
2010 

Pension Plan: 
Cash and cash equivalents ................................................................................  
Equity securities: 

U.S. large capitalization ................................................................................  
U.S. small and mid capitalization ..................................................................  
International and emerging markets ..............................................................  
Total equity ........................................................................................................  
Debt securities ...................................................................................................  
Real estate ........................................................................................................  
Private equity .....................................................................................................  
Total ..................................................................................................................    
Postretirement Plans: 
Cash and cash equivalents ................................................................................  
Equity securities: 
U.S. large capitalization ................................................................................  
U.S. small and mid capitalization ..................................................................  
International .................................................................................................  
Total equity ........................................................................................................  
Debt securities ...................................................................................................  
Total ..................................................................................................................    

   0 - 5% 

29 - 39 
  2 - 12 
  9 - 19 
50 - 60 
35 - 45 
  0 - 9   
  0 - 4   

 0 - 10% 

33 - 43 
  3 - 13 
10 - 20 
55 - 65 
30 - 40 

Percentage of Plan Assets at  December 31, 

2009 

2008 

1% 

32   
10   
15   
57   
37   
4   
1   
100% 

4% 
39   
10   
12   
61   
35   
100% 

1% 

16  
10  
9  
35  
56  
6  
2  
100% 

6% 
20  
21  
12  
53  
41  
100% 

In general, the U.S. large capitalization equity investments are passively managed or indexed, whereas the 
international, emerging markets, U.S. small capitalization, and U.S. mid capitalization equity investments are actively 
managed by investment managers. Debt securities include a broad range of fixed income vehicles. Debt security 
investments in high-yield securities, emerging market securities, and non-U.S. dollar-denominated securities are owned 
by the plans, but in limited quantities to reduce risk. Most of the debt security investments are under active management 
by investment managers. Real estate investments include private real estate vehicles; however, Ameren does not, by 
policy, hold direct investments in real estate property. Ameren’s investment in private equity funds consists of 13 different 
limited partnerships, with invested capital ranging from $200,000 to $10 million individually, which invest primarily in a 
diversified number of small U.S.-based companies. No further commitments may be made to private equity investments 
without approval by the finance committee of the board of directors. Additionally, Ameren’s investment committee allows 
investment managers to use derivatives, such as index futures, exchange traded funds, foreign exchange futures, and 
options, in certain situations, to increase or to reduce market exposure in an efficient and timely manner.  

Fair Value Measurements of Plan Assets  

Investments in the pension and postretirement benefit plans were stated at fair value as of December 31, 2009. The 

fair value of an asset is the amount that would be received upon sale in an orderly transaction between market 
participants at the measurement date. Cash and cash equivalents have initial maturities of three months or less and are 
recorded at cost plus accrued interest. The carrying amounts of cash and cash equivalents approximate fair value 
because of the short-term nature of these instruments. Investments traded in active markets on national or international 
securities exchanges are valued at closing prices on the last business day on or before the measurement date. Securities 
traded in over-the-counter markets are valued based on quoted market prices, broker or dealer quotations, or alternative 
pricing sources with reasonable levels of price transparency. Derivative contracts are valued at fair value, as determined 
by the investment managers (or independent third parties on behalf of the investment managers), who use proprietary 
models and take into consideration exchange quotations on underlying instruments, dealer quotations, and other market 
information. The fair value of real estate is based on annual appraisal reports prepared by an independent real estate 
appraiser.  

149 

  
 
 
 
 
  
  
  
  
  
  
  
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table sets forth, utilizing the fair value hierarchy discussed in Note 8 – Fair Value Measurements, the 

pension plan assets measured at fair value as of December 31, 2009:  
Quoted Prices in 
Active Markets for 
Identified Assets 
(Level 1) 
$ 

Cash and cash equivalents .................................................................. 
Equity securities: 

1 

Significant Other 
Observable Inputs 
(Level 2) 
35 
$ 

Significant Other 
Unobservable 
Inputs 
(Level 3) 
 - 

$ 

U.S. large capitalization .................................................................. 
U.S. small and mid capitalization .................................................... 
International and emerging markets ................................................ 

Debt securities: 

Corporate bonds ............................................................................ 
Municipal bonds ............................................................................. 
U.S. treasury and agency securities ............................................... 
Asset-backed securities .................................................................. 
Other .............................................................................................. 
Real estate .......................................................................................... 
Private equity ....................................................................................... 
Derivative assets ................................................................................. 
Total .................................................................................................... 

  270 
  242 
  114 

- 
- 
  179 
- 
- 
- 
- 
4 
$   810 

556 
10 
264 

579 
44 
30 
19 
102 
- 
- 
- 
$   1,639 

- 
- 
- 

- 
- 
- 
- 
1 
90 
33 
- 
$   124 

Total 
36 
$ 

826 
252 
378 

579 
44 
209 
19 
103 
90 
33 
4 
$   2,573(a)(b) 

(a) 

Includes $77 million of medical benefit (health and welfare) component for accounts maintained in accordance with Section 401(h) of the Internal Revenue 
Code (401(h) accounts) to fund a portion of the postretirement obligation.  

(b)  Excludes $1 million net payable related to pending security purchases.  

The following table summarizes the changes in the fair value of the pension plan assets classified as Level 3 in the 

fair value hierarchy for the year ended December 31, 2009:  

Other debt securities .........  
Real estate .......................  
Private equity ....................  

Beginning 
Balance at  
January 1, 2009 

$ 
1 
  144 
39 

Actual Return on 
Plan Assets Related 
to Assets Still Held 
at the Reporting Date 

$ 

 -  
(53 ) 
(6 ) 

Actual Return on 
Plan Assets Related 
to Assets Sold 
During the Period 

$ 

 -  
(2 ) 
3  

Purchases, 
Sales, and  
Settlements, net 
$   -   
1   
(3 ) 

Net 
Transfers 
into (out of) 
of Level 3 
$    - 
- 
- 

Ending Balance at 
December 31, 2009 

$ 

1 
90 
33 

The following table sets forth, utilizing the fair value hierarchy discussed in Note 8 – Fair Value Measurements, the 

postretirement benefit plans assets measured at fair value as of December 31, 2009:  

Cash and cash equivalents ....................................................................  
Equity securities: 

U.S. large capitalization ....................................................................  
U.S. small and mid capitalization ......................................................  
International .....................................................................................  

Debt securities: 

Corporate bonds ..............................................................................  
Municipal bonds ...............................................................................  
U.S. treasury and agency securities .................................................  
Asset-backed securities ....................................................................  
Other ................................................................................................  
Derivative assets ...................................................................................  
Total ......................................................................................................  

Quoted Prices in 
Active Markets for 
Identified Assets 
(Level 1) 
1 
$ 

Significant Other 
Observable Inputs 
(Level 2) 
$  26 

Significant Other 
Unobservable 
Inputs 
(Level 3) 
$ 

- 

  193 
64 
35 

3 
- 
14 
- 
- 
1 
$   311 

60 
- 
45 

66 
58 
35 
23 
28 
- 
$   341 

- 
- 
- 

- 
- 
- 
- 
- 
- 
$    - 

Total 
27 
$ 

253 
64 
80 

69 
58 
49 
23 
28 
1 
$    652(a)(b) 

(a)  Excludes $77 million of medical benefit (health and welfare) component for 401(h) accounts to fund a portion of the postretirement obligation. These 401(h) 

assets are included in the pension plan assets shown above.  

(b)  Excludes net $3 million of Medicare and interest receivables, offset by payables related to pending security purchases.  

150 

  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Net Periodic Benefit Cost  

The following table presents the components of the net periodic benefit cost of our pension and postretirement benefit 

plans during 2009, 2008, and 2007:  

2009: 
Service cost ....................................................................................................................................  
Interest cost ....................................................................................................................................  
Expected return on plan assets .......................................................................................................  
Amortization of: 

Transition obligation ..................................................................................................................  
Prior service cost  ......................................................................................................................  
Actuarial loss  ............................................................................................................................  
Net periodic benefit cost ..................................................................................................................  
2008: 
Service cost ....................................................................................................................................  
Interest cost ....................................................................................................................................  
Expected return on plan assets .......................................................................................................  
Amortization of: 

Transition obligation ..................................................................................................................  
Prior service cost  ......................................................................................................................  
Actuarial loss  ............................................................................................................................  
Net periodic benefit cost ..................................................................................................................  
2007: 
Service cost ....................................................................................................................................  
Interest cost ....................................................................................................................................  
Expected return on plan assets .......................................................................................................  
Amortization of: 

Transition obligation ..................................................................................................................  
Prior service cost  ......................................................................................................................  
Actuarial loss  ............................................................................................................................  
Net periodic benefit cost ..................................................................................................................  

Pension Benefits 
Ameren(a)  

Postretirement Benefits 
Ameren(a)  

$ 

68  
186  
(206 ) 

-  
9  
24  
81  

60  
186  
(213 ) 

-  
11  
3  
47  

63  
180  
(206 ) 

-  
11  
22  
70  

$ 

$ 

$ 

$ 

$ 

$  19  
66  
(54) 

2  
(8) 
9  
$  34  

$  18  
70  
(58) 

2  
(8) 
9  
$  33  

$  21  
72  
(53) 

2  
(8) 
24  
$  58  

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
The current year expected return on plan assets is primarily determined by adjusting the prior-year market-related 
asset value for current year contributions, disbursements, and expected return, plus 25% of the actual return in excess of 
(or less than) expected return for the four prior years.  

The estimated amounts that will be amortized from regulatory assets and accumulated OCI into net periodic benefit 

cost in 2010 are as follows:  

Regulatory assets: 

Accumulated OCI: 

Transition obligation ................................................................................................................  
Prior service cost (credit) .........................................................................................................  
Net actuarial loss .....................................................................................................................  

Transition obligation ................................................................................................................  
Prior service cost (credit) .........................................................................................................  
Net actuarial loss .....................................................................................................................  
Total .............................................................................................................................................  

Pension Benefits 
Ameren(a)  

Postretirement Benefits 
Ameren(a)  

$ 

 - 
5 
  33 

$ 

 - 
1 
- 
$   39 

$  4  
(4) 
  15  

$ 

 -  
(3) 
1  
$   13  

(a) 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

151 

  
 
 
 
  
 
  
  
 
 
 
 
  
  
 
 
 
 
 
 
  
  
 
 
 
 
  
  
 
 
 
 
 
 
  
  
 
 
 
 
  
  
 
 
 
 
 
 
  
 
 
 
  
 
  
  
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
  
Prior service cost is amortized on a straight-line basis over the average future service of active participants benefiting 

under the plan. The net actuarial loss subject to amortization is amortized on a straight-line basis over 10 years.  

UE, CIPS, Genco, CILCO and IP are responsible for their share of the pension and postretirement benefit costs. The 

following table presents the pension costs and the postretirement benefit costs incurred for the years ended 
December 31, 2009, 2008 and 2007:  

Ameren(a)  ..........................................................................................  
UE  ....................................................................................................  
CIPS ..................................................................................................  
Genco ................................................................................................  
CILCO ...............................................................................................  
IP   ....................................................................................................  
(a) 

Pension Costs 
2008 
$   47   
35   
7   
5   
5   
(2 ) 

2007 
$   70 
  44 
  10 
7 
8 
4 

2009 
$   81 
  50 
8 
7 
  14 
- 

Postretirement Costs 

2009 
$   34 
  15 
2 
3 
7 
  12 

2008 
$   33 
  13 
3 
2 
6 
  14 

$ 

2007 
  58 
26 
6 
3 
13 
13 

Includes amounts for Ameren registrant and nonregistrant subsidiaries.  
The expected pension and postretirement benefit payments from qualified trust and company funds and the federal 

subsidy for postretirement benefits related to prescription drug benefits, which reflect expected future service, as of 
December 31, 2009, are as follows:  

2010 ..........................................................................................................  
2011 ..........................................................................................................  
2012 ..........................................................................................................  
2013 ..........................................................................................................  
2014 ..........................................................................................................  
2015 – 2019...............................................................................................  

Pension Benefits 

Paid from 
Qualified 
Trust 
$  194 
201 
208 
214 
222 
  1,225 

Paid from 
Company 
Funds 
$  3 
  3 
  3 
  2 
  2 
  11 

Postretirement Benefits 
Paid from 
Company 
Funds 
$  3 
  3 
  3 
  3 
  3 
  16 

Paid from 
Qualified 
Trust 
$  78 
82 
86 
89 
93 
  504 

Federal 
Subsidy 
$  5 
5 
6 
6 
6 
  32 

The following table presents the assumptions used to determine net periodic benefit cost for our pension and 

postretirement benefit plans for the years ended December 31, 2009, 2008, and 2007:  

Pension Benefits 
2008 

2007 

2009 

Postretirement Benefits 
2008 

2009 

Ameren, UE, CIPS , Genco, CILCO and IP: 
Discount rate at measurement date .........................................  
Expected return on plan assets ...............................................  
Increase in future compensation .............................................  
Medical cost trend rate (initial).................................................  
Medical cost trend rate (ultimate) ............................................  
Years to ultimate rate ..............................................................  

6.05% 
8.25  
4.00  
9.00  
5.00  
4 years  
The table below reflects the sensitivity of Ameren’s plans to potential changes in key assumptions:  

5.75% 
8.00  
4.00  
7.00  
5.00  
4 years  

5.85% 
8.50  
4.00  
-  
-  
-  

6.15% 
8.25  
4.00  
-  
-  
-  

5.75% 
8.00  
4.00  
-  
-  
-  

2007 

5.80% 
8.50   
4.00   
9.00   
5.00   
4 years   

0.25% decrease in discount rate ......................................................  
0.25% increase in salary scale .........................................................  
1.00% increase in annual medical trend ...........................................  
1.00% decrease in annual medical trend ..........................................  

Other  

Ameren sponsors a 401(k) plan for eligible 
employees. The Ameren plan covered all eligible 
employees of the Ameren Companies at December 31, 
2009. The plans allowed employees to contribute a portion 
of their base pay in accordance with specific guidelines. 
Ameren matched a percentage of the employee 
contributions up to certain limits. Ameren’s matching 
contributions to the 401(k) plan totaled $24 million, $23 
million, and $21 million in 2009, 2008, and 2007, 
respectively.  

Pension 

Postretirement 

$ 

Service Cost and 
Interest Cost 
  - 
2 
- 
- 

Projected Benefit 
Obligation 
$   93 
  13 
- 
- 

$ 

Service Cost and 
Interest Cost 
 -  
-  
2  
(2 ) 

Postretirement 
Benefit Obligation 
$  31  
-  
32  
(29 ) 

The following table presents the portion of the 401(k) 

matching contribution to the Ameren plan attributable to 
each of the Ameren Companies for the years ended 
December 31, 2009, 2008, and 2007:  

2007 
Ameren(a)  ..................................................................................................  
$   21 
UE  ............................................................................................................  
  14 
CIPS ..........................................................................................................  
1 
Genco ........................................................................................................  
1 
CILCO .......................................................................................................  
2 
IP   ............................................................................................................  
3 
Includes amounts for Ameren registrant and nonregistrant subsidiaries.  

2008 
$   23 
  14 
2 
2 
2 
2 

2009 
$   24 
  14 
2 
2 
4 
2 

(a) 

152 

  
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
NOTE 12 – Stock-Based Compensation  

Ameren’s long-term incentive plan for eligible 

employees, called the Long-term Incentive Plan of 1998 
(1998 Plan), was replaced prospectively by the 2006 
Omnibus Incentive Compensation Plan (2006 Plan) 
effective May 2, 2006. The 2006 Plan provides for a 
maximum of 4 million common shares to be available for 
grant to eligible employees and directors. No new awards 

may be granted under the 1998 Plan; however, previously 
granted awards continue to vest or to be exercisable in 
accordance with their original terms and conditions. The 
2006 Plan awards may be stock options, stock 
appreciation rights, restricted stock, restricted stock units, 
performance shares, performance share units, cash-
based awards, and other stock-based awards. 

A summary of nonvested shares as of December 31, 2009, and changes during the year ended December 31, 2009, 

under the 1998 Plan and the 2006 Plan are presented below:  

Nonvested at January 1, 2009...................................................................    
Granted(a)  .................................................................................................    
Dividends ..................................................................................................    
Unearned or forfeited(b) .............................................................................    
Earned and vested(c) .................................................................................    
Nonvested at December 31, 2009 .............................................................    

Performance Share Units 

Restricted Shares 

Share Units 
675,977  
741,738  
-  
(247,065 ) 
(225,313 ) 
945,337  

Weighted-average 
Fair Value per Unit 
$   43.28 
  15.52 
- 
  57.15 
  25.66 
$  22.07 

Shares 
    213,683  
-  
7,934  
(3,644 ) 
(82,277 ) 
    135,696  

Weighted-average 
Fair Value per Share 
$   47.46 
- 
  25.39 
  48.30 
  45.15 
$  48.92 

(a) 

(b) 
(c) 

Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in March 2009 under the 
2006 Plan.  
Includes share units granted in 2007 that were not earned based on performance provisions of the award grants.  
Includes share units granted in 2007 that vested as of December 31, 2009, that were earned pursuant to the provisions of the award grants. Also includes 
share units that vested due to attainment of retirement eligibility by certain employees. Actual shares issued for retirement-eligible employees will vary 
depending on actual performance over the three-year measurement period.  
Ameren recorded compensation expense of 
$15 million, $22 million, and $18 million for the years 
ended December 31, 2009, 2008, and 2007, respectively, 
and a related tax benefit of $6 million, $8 million, and 
$7 million for the years ended December 31, 2009, 2008, 
and 2007, respectively. As of December 31, 2009, total 
compensation cost of $8 million related to nonvested 
awards not yet recognized is expected to be recognized 
over a weighted-average period of 16 months.  

relative to the designated peer group beginning January 1, 
2009. The significant assumptions used to calculate fair 
value also included a three-year risk-free rate of 1.24%, 
volatility of 21.3% to 33.1% for the peer group, and 
Ameren’s attainment of earnings per share of at least 
$2.54 during each year of the three-year performance 
period.  

The fair value of each share unit awarded in February 

Performance Share Units  

Performance share unit awards were granted under 
the 2006 Plan each year since 2006. A share unit will vest 
and entitle an employee to receive shares of Ameren 
common stock (plus accumulated dividends) if, at the end 
of the three-year performance period, certain specified 
performance or market conditions have been met and the 
individual remains employed by Ameren. The exact 
number of shares issued pursuant to a share unit will vary 
from 0% to 200% of the target award, depending on actual 
company performance relative to the performance goals. 
For performance share units granted in 2006, 2007 and 
2008, vested performance shares units are held for a 2-
year period before being paid to the employee in shares of 
Ameren common stock. During this 2-year hold period, the 
employee is paid dividend equivalents on a current basis.  
The fair value of each share unit awarded in March 

2009 under the 2006 Plan was determined to be $15.52. 
That amount was based on Ameren’s closing common 
share price of $22.20 at March 2, 2009, and lattice 
simulations. Lattice simulations are used to estimate 
expected share payout based on Ameren’s total 
shareholder return for a three-year performance period 

2008 under the 2006 Plan was determined to be $32.35. 
That amount was based on Ameren’s closing common 
share price of $44.30 at the grant date and lattice 
simulations. The significant assumptions used to calculate 
fair value also included a three-year risk-free rate of 
2.264%, dividend yields of 2.3% to 5.4% for the peer 
group, volatility of 14.43% to 21.51% for the peer group, 
and Ameren’s attainment of earnings per share of at least 
$2.54 during each year of the three-year performance 
period.  

Restricted Stock  

Restricted stock awards of Ameren common stock 
were granted under the 1998 Plan from 2001 to 2005. 
Restricted shares have the potential to vest over a seven-
year period from the date of grant if the company achieves 
certain performance levels. An accelerated vesting 
provision included in this plan reduces the vesting period 
from seven years to three years if the earnings growth rate 
exceeds a prescribed level.  

Stock Options  

Options to purchase Ameren common stock were 

granted under the 1998 Plan at a price not less than the

153 

 
  
  
 
 
 
 
 
  
 
 
   
 
 
 
   
 
   
 
   
 
 
  
fair-market value of the common shares at the date of 
grant. Granted options vest over a period of five years, 
beginning at the date of grant, and they permit accelerated 
exercising upon the occurrence of certain events, 
including retirement. There have not been any stock 

options granted since December 31, 2000. Outstanding 
options of 58,350 at December 31, 2009, expired in 
February 2010. There is no expense from stock options 
for the years ended December 31, 2009, 2008 and 2007, 
as all options granted were fully vested.  

NOTE 13 – INCOME TAXES  

The following table presents the principal reasons why the effective income tax rate differed from the statutory federal 

income tax rate for the years ended December 31, 2009, 2008 and 2007:  

Ameren 

2009: 
Statutory federal income tax rate: ....................................................  

Increases (decreases) from:  

Permanent items(a) ...............................................................  
Depreciation differences ......................................................  
Amortization of investment tax credit ....................................  
State tax ..............................................................................  
Reserve for uncertain tax positions ......................................  
Other(b)  ................................................................................  
Effective income tax rate .................................................................  
2008: 
Statutory federal income tax rate: ....................................................  

Increases (decreases) from: 

Permanent items(a) ...............................................................  
Depreciation differences ......................................................  
Amortization of investment tax credit ....................................  
State tax ..............................................................................  
Reserve for uncertain tax positions ......................................  
Other(c)  ................................................................................  
Effective income tax rate .................................................................  
2007: 
Statutory federal income tax rate: ....................................................  

Increases (decreases) from: 

Permanent items(a) ...............................................................  
Depreciation differences ......................................................  
Amortization of investment tax credit ....................................  
State tax ..............................................................................  
Reserve for uncertain tax positions ......................................  
Other(d)  ................................................................................  
Effective income tax rate .................................................................  

35% 

(1 ) 
(1 ) 
(1 ) 
5   
(1 ) 
(1 ) 
35% 

35% 

(1 ) 
-   
(1 ) 
4   
(1 ) 
(2 ) 
34% 

35% 

(2 ) 
-   
(1 ) 
4   
(1 ) 
(1 ) 
34% 

UE 

35% 

-  
(3) 
(1) 
3  
-  
(1) 
33% 

35% 

1  
(1) 
(1) 
3  
(1) 
-  
36% 

35% 

(2) 
-  
(1) 
4  
(1) 
(2) 
33% 

CIPS 

Genco 

CILCO 

35% 

-  
(1) 
(4) 
5  
1  
-  
36% 

35% 

(1) 
(2) 
(10) 
5  
(1) 
(1) 
25% 

35% 

2  
3  
(6) 
6  
-  
(4) 
36% 

35% 

(1) 
-  
-  
4  
-  
-  
38% 

35% 

(2) 
-  
-  
5  
(1) 
(1) 
36% 

35% 

(1) 
-  
(1) 
5  
-  
-  
38% 

35% 

(3) 
-  
-  
4  
(1) 
-  
35% 

35% 

(1) 
(1) 
(1) 
5  
-  
(1) 
36% 

35% 

(2) 
(1) 
(1) 
3  
-  
-  
34% 

IP 

35% 

-  
-  
-  
5  
-  
-  
40% 

35% 

7  
-  
-  
5  
2  
1  
50% 

35% 

1  
(3 ) 
-  
5  
-  
(1 ) 
37% 

(a)  Permanent items are treated differently for book and tax purposes and primarily include Internal Revenue Code Section 199 production activity deductions for 
Ameren, UE, Genco and CILCO, company-owned life insurance for Ameren and CILCO, impacts of Medicare Part D for Ameren, UE, Genco and CILCO, 
employee stock ownership plan dividends for Ameren, and nondeductible expenses for IP.  
(b)  Primarily includes low-income housing tax credits and research credits for Ameren and UE.  
(c)  Primarily includes settlements with state taxing authorities for Ameren, state apportionment changes for Ameren, CIPS, Genco, and CILCO, research credits 
for Ameren, Genco, and CILCO and low-income housing tax credits for Ameren and CIPS.  

(d)  Primarily includes low-income housing tax credits for Ameren, UE, CIPS and IP.  

154 

  
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The following table presents the components of income tax expense (benefit) for the years ended December 31, 

2009, 2008, and 2007:  

2009: 
Current taxes: 

Deferred taxes: 

Federal...........................................................................  
State ..............................................................................  

Federal...........................................................................  
State ..............................................................................  
Deferred investment tax credits, amortization .......................  
Total income tax expense ....................................................  
2008: 
Current taxes: 

Federal...........................................................................  
State ..............................................................................  

Deferred taxes: 

Federal...........................................................................  
State ..............................................................................  
Deferred investment tax credits, amortization .......................  
Total income tax expense ....................................................  
2007: 
Current taxes: 

Federal...........................................................................  
State ..............................................................................  

Deferred taxes: 

Ameren (a) 

UE 

CIPS 

Genco 

CILCO 

IP 

$ 

(73) 
3  

337  
74  
(9) 
$   332  

$  165  
10  

130  
31  
(9) 
$  327  

$  311  
17  

$ 

(117 ) 
(31 ) 

239  
42  
(5 ) 
$     128  

$ 

37  
5  

86  
11  
(5 ) 
$  134  

$  13  
8  

(1) 
(2) 
(2) 
$  16  

$ 

$ 

4  
3  

2  
(2) 
(2) 
5  

$ 

$ 

$ 

30  
11  

46  
10  
(1) 
96  

81  
15  

5  
-  
(1) 
$  100  

$  105  
8  

$  21  
2  

$ 

49  
9  

$ 

$ 

$ 

$ 

$ 

21  
11  

34  
7  
(1 ) 
  72  

25  
5  

9  
1  
(1 ) 
39  

36  
5  

$ 

$ 

$ 

$ 

$ 

(7) 
6  

45  
9  
-  
53  

(11) 
(11) 

17  
10  
-  
    5  

3  
(2) 

Federal...........................................................................  
State ..............................................................................  
Deferred investment tax credits, amortization .......................  
Total income tax expense ....................................................  

(10) 
(2) 
(2) 
9  
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  
The following table presents the deferred tax assets and deferred tax liabilities recorded as a result of temporary 

22  
10  
(5 ) 
$  140  

7  
4  
(9) 
$  330  

1  
(2 ) 
(1 ) 
39  

17  
4  
(1) 
78  

(a) 

$ 

$ 

$ 

$ 

11  
3  
-  
15  

differences at December 31, 2009 and 2008:  

Ameren (a) 

UE 

CIPS 

Genco 

CILCO 

IP 

$   2,813  
3  
52  
(313 ) 
63  
5  
(43 ) 
12  
$  2,592  

$  1,717  
(3) 
54  
(98) 
-  
-  
(9) 
11  
$  1,672  

$    197  
79  
(1 ) 
(3 ) 
-  
-  
-  
(17 ) 
$  255  

$ 

$ 

  324  
(77 ) 
-  
(25 ) 
-  
-  
(23 ) 
17  
216  

$    282  
-  
(1 ) 
(56 ) 
-  
-  
(11 ) 
(10 ) 
$  204  

$ 

$ 

  261  
-  
1  
(18) 
(24) 
-  
-  
(5) 
215  

2009: 
Accumulated deferred income taxes, net liability (asset): 
Plant related ...............................................................  
Deferred intercompany tax gain/basis step-up ............  
Regulatory assets (liabilities), net ...............................  
Deferred benefit costs ................................................  
Purchase accounting ..................................................  
Leveraged leases .......................................................  
ARO ...........................................................................  
Other ..........................................................................  
Total net accumulated deferred income tax  liabilities(b) ....  
2008: 
Accumulated deferred income taxes, net liability (asset): 
Plant related ...............................................................  
Deferred intercompany tax gain/basis step-up ............  
Regulatory assets (liabilities), net ...............................  
Deferred benefit costs ................................................  
Purchase accounting ..................................................  
Leveraged leases .......................................................  
ARO ...........................................................................  
Other ..........................................................................  
Total net accumulated deferred income tax liabilities(c) .....  

$ 

$  2,377  
4  
37  
(281 ) 
38  
6  
(27 ) 
(19 ) 
$  2,135  

$  182  
90  
(3 ) 
(5 ) 
-  
-  
-  
(10 ) 
$  254  
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  
Includes $18 million, $10 million, and $17 million as current assets recorded in the balance sheets for CIPS, CILCO and IP, respectively. Includes $38 million, 
$12 million and $26 million as current liabilities recorded in the balance sheets for Ameren, UE and Genco respectively.  
Includes $3 million, $5 million, $15 million, and $15 million as current assets recorded in the balance sheets for UE, CIPS, CILCO and IP, respectively. 
Includes $4 million and $15 million as current liabilities recorded in the balance sheets for Ameren and Genco, respectively.  
Ameren and IP have Illinois net operating loss carryforwards of $3 million and $1 million, respectively. These will 

$  1,427  
(3) 
44  
(92) 
-  
-  
5  
(12) 
$  1,369  

$  242  
-  
(3 ) 
(59 ) 
-  
-  
(11 ) 
(13 ) 
$  156  

289  
(87 ) 
-  
(32 ) 
-  
-  
(21 ) 
2  
151  

205  
-  
-  
(1) 
(33) 
-  
-  
(10) 
161  

$ 

$ 

$ 

(a) 
(b) 

(c) 

begin to expire in 2017.  

155 

  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Uncertain Tax Positions  

On January 1, 2007, the Ameren Companies adopted authoritative accounting guidance, which addressed the 
determination of whether tax benefits claimed or expected to be claimed on an income tax return should be recorded in 
the financial statements.  

A reconciliation of the change in the unrecognized tax benefit balance during the years ended December 31, 2007, 

2008 and 2009, is as follows:  

Unrecognized tax benefits – January 1, 2007 ...................................................................   
Increases based on tax positions prior to 2007 ...........................................................   
Decreases based on tax positions prior to 2007 ..........................................................  
Increases based on tax positions related to 2007 ........................................................  
Changes related to settlements with taxing authorities ................................................  
Decreases related to the lapse of statute of limitations ................................................  
Unrecognized tax benefits – December 31, 2007 .............................................................  
Increases based on tax positions prior to 2008 ...........................................................  
Decreases based on tax positions prior to 2008 ..........................................................  
Increases based on tax positions related to 2008 ........................................................  
Changes related to settlements with taxing authorities ................................................  
Decreases related to the lapse of statute of limitations ................................................  
Unrecognized tax benefits – December 31, 2008 .............................................................  
Increases based on tax positions prior to 2009 ...........................................................  
Decreases based on tax positions prior to 2009 ..........................................................  
Increases based on tax positions related to 2009 ........................................................  
Changes related to settlements with taxing authorities ................................................  
Decreases related to the lapse of statute of limitations ................................................  
Unrecognized tax benefits – December 31, 2009 .............................................................  
Total unrecognized tax benefits that, if recognized, 

would impact the effective tax rates as of December 31, 2007 ....................................  

Total unrecognized tax benefits (detriments) that, if recognized, 

would impact the effective tax rates as of December 31, 2008 ....................................  

Total unrecognized tax benefits that, if recognized, 

would impact the effective tax rates as of December 31, 2009 ....................................  

Ameren 
$   155  
31  
(21) 
17  
(60) 
(6) 
$  116  
16  
(46) 
31  
(7) 
-  
$  110  
90  
(84) 
19  
-  
-  
$  135  

$  26  

$  12  

$ 

6  

UE 
$  58  
4  
(8) 
6  
(28) 
(6) 
$  26  
2  
(13) 
6  
(1) 
-  
$  20  
76  
(19) 
11  
-  
-  
$  88  

$ 

$ 

$ 

4  

1  

3  

$ 

CIPS 
$  15  
-  
(3 ) 
-  
  (12 ) 
-  
 -  
-  
-  
-  
-  
-  
 -  
-  
-  
-  
-  
-  
 -  

$ 

$ 

$ 

$ 

$ 

 -  

 -  

 -  

Genco 
$  36  
10  
(8) 
6  
(4) 
-  
$  40  
4  
(9) 
13  
(1) 
-  
$  47  
9  
(31) 
3  
-  
-  
$  28  

$ 

$ 

$ 

 -  

(2) 

 -  

CILCO 
$  18  
3  
-  
5  
(7) 
-  
$  19  
2  
(4) 
8  
-  
-  
$  25  
5  
(18) 
3  
-  
-  
$  15  

$  1  

$ 

 -  

$  1  

As of January 1, 2007, the Ameren Companies adopted a policy of recognizing interest charges (income) and 
penalties accrued on tax liabilities on a pretax basis as interest charges (income) or miscellaneous expense in the 
statements of income.  

A reconciliation of the change in the liability for interest on unrecognized tax benefits during the years ended 

December 31, 2007, 2008 and 2009, is as follows:  

$ 

IP 
$  12  
-  
(2) 
-  
(10) 
-  
 -  
-  
-  
-  
-  
-  
 -  
-  
-  
-  
-  
-  
 -  

$ 

$ 

$ 

$ 

$ 

 -  

 -  

 -  

Liability for interest – January 1, 2007 ..................................................................................  
Interest charges for 2007 ................................................................................................  
Liability for interest – December 31, 2007.............................................................................  
Interest income for 2008 .................................................................................................  
Liability for interest – December 31, 2008.............................................................................  
Interest charges (income) for 2009 .................................................................................  
Liability for interest – December 31, 2009.............................................................................  

Ameren 
$   12  
5  
$  17  
(7) 
$  10  
(2) 
$  8  

UE 
$  5  
-  
$  5  
(3) 
$  2  
2  
$  4  

CIPS 
$  1  
-  
$  1  
(1) 
 -  
-  
 -  

$ 

$ 

Genco 
$  4  
3  
$  7  
(3 ) 
$  4  
(2 ) 
$  2  

CILCO 
$  1  
  1  
$  2  
-  
$  2  
  (1) 
$  1  

IP 
$   - 
- 
$   - 
- 
$   - 
- 
$   - 

As of January 1, 2007, December 31, 2007, December 31, 2008, and December 31, 2009, the Ameren Companies 

have accrued no amount for penalties with respect to unrecognized tax benefits.  

Ameren’s 2005 and 2006 federal income tax returns are before the Appeals Office of the Internal Revenue Service. 

The Internal Revenue Service is currently examining Ameren’s 2007 and 2008 income tax returns.  

State income tax returns are generally subject to examination for a period of three years after filing of the return. The 
state impact of any federal changes remains subject to examination by various states for a period of up to one year after 
formal notification to the states. The Ameren Companies do not currently have material state income tax issues under 
examination, administrative appeals, or litigation.  

It is reasonably possible that events will occur during the next 12 months that would cause the total amount of 
unrecognized tax benefits for the Ameren Companies to increase or decrease. However, the Ameren Companies do not 
believe such increases or decreases would be material to their financial condition or results of operations.  

156 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
NOTE 14 – RELATED PARTY TRANSACTIONS  

The Ameren Companies have engaged in, and may in 

the future engage in, affiliate transactions in the normal 
course of business. These transactions primarily consist of 
gas and power purchases and sales, services received or 
rendered, and borrowings and lendings. Transactions 
between affiliates are reported as intercompany 
transactions on their financial statements, but are 
eliminated in consolidation for Ameren’s financial 
statements. Below are the material related party 
agreements.  

2007 Illinois Electric Settlement Agreement  

As part of the 2007 Illinois Electric Settlement 
Agreement, the Ameren Illinois Utilities, Genco, and 
AERG agreed to make aggregate contributions of $150 
million over four years as part of a comprehensive 
program to provide $1 billion of funding for rate relief to 
certain Illinois electric customers, including customers of 
the Ameren Illinois Utilities.  

At December 31, 2009, CIPS, CILCO and IP had 
receivable balances from Genco for reimbursement of 
customer rate relief of less than $1 million each. Also at 
December 31, 2009, CIPS, CILCO and IP had receivable 
balances from AERG for reimbursement of customer rate 
relief of less than $1 million each. During the year ended 
December 31, 2009, Genco incurred charges to earnings 
of $10 million for customer rate relief contributions and 
program funding reimbursements to the Ameren Illinois 
Utilities (CIPS – $3 million, CILCO – $2 million, IP – 
$5 million), and AERG incurred charges to earnings of 
$5 million (CIPS – $2 million, CILCO – $1 million, and IP – 
$2 million). The Ameren Illinois Utilities recorded most of 
the reimbursements received from Genco and AERG as 
electric revenue. An immaterial amount was recorded as 
miscellaneous revenue.  

Electric Power Supply Agreements  

The following table presents the amount of physical 

gigawatthour sales under related party electric power 
supply agreements for the years ended December 31, 
2009, 2008, and 2007:  

2009 

Genco sales to 

AERG sales to 

Marketing Company 

Marketing Company(a) ....................    13,372 
Marketing Company(a) ....................    6,817 
sales to CIPS(b) ..............................    1,283 
sales to CILCO(b) ............................   
sales to IP(b) ...................................    1,690 

556 

Marketing Company 

Marketing Company 

December 31, 
2008 

2007 
    16,551      17,425 
    6,677      5,316 
    2,050      2,396 
909      1,167 
    2,870      3,493 

(a)  Both Genco and AERG have a power supply agreement with Marketing 
Company whereby Genco and AERG sell and Marketing Company 
purchases all the capacity and energy available from Genco’s and 
AERG’s generation fleets.  
power based on the results of the September 2006  
Illinois power procurement auction. The values in this table reflect the 
physical sales volumes provided in that agreement.  

(b)  Marketing Company contracted with CIPS, CILCO, and IP to provide 

In December 2006, Genco and AERG entered into 

two separate power supply agreements (PSA) with 
Marketing Company, whereby Genco and AERG agreed 
to sell and Marketing Company agreed to purchase all of 
the capacity available from Genco’s and AERG’s 
generation fleets and all of the associated energy. In 
March 2008, Genco and AERG entered into an 
amendment to their respective PSAs with Marketing 
Company. Under the amendment, Genco and AERG are 
liable to Marketing Company in the event of an unplanned 
outage or derate (reduction in rated capacity) due to 
sudden, unanticipated failure or accident within 
the generating plant site of one or more of its generating 
units. Genco’s and AERG’s liability in such cases will be 
for the positive difference, if any, between the market price 
of capacity or energy Genco and AERG do not deliver and 
the contract price under the PSA for that capacity or 
energy. An unplanned outage or derate that continues for 
one year or more is an event of default under the PSA. In 
the event of Marketing Company’s unexcused failure to 
receive energy under the PSA, Marketing Company would 
be required to pay Genco and AERG the positive 
difference, if any, between the contract price and the price 
that Genco and AERG, acting in a commercially 
reasonable manner, actually receives when it resells the 
unreceived energy, less any reasonable related 
transmission, ancillary service, or brokerage costs. In 
January 2010, Genco and AERG entered into an 
amendment to their respective PSAs with Marketing 
Company primarily because of the EEI ownership transfer 
to Genco.  

Both of the PSAs will continue through December 31, 
2022, and from year to year thereafter unless either party 
elects to terminate the agreement by providing the other 
party with no less than six months advance written notice.  
In accordance with a January 2006 ICC order, an 
auction was held in September 2006 to procure power for 
CIPS, CILCO and IP beginning January 1, 2007. Through 
the auction, Marketing Company contracted with CIPS, 
CILCO and IP to provide power for residential and small 
commercial customers (less than one megawatt of 
demand) as follows:  

Term 
Megawatts(a)  .................  
Cost per 

megawatthour .........  

May 31, 2008 
17 Months 
300 

Term Ending 
May 31, 2009 
29 Months 

750 

May 31, 2010 
41 Months 
750 

$   64.77 

$   64.75 

$    66.05 

(a)  Before impact to Ameren Illinois Utilities’ load due to customer 

switching.  

Capacity Supply Agreements  

To replace the power supply contracts that expired on 

May 31, 2008, the Ameren Illinois Utilities used RFP 
processes in early 2008, pursuant to the 2007 Illinois 
Electric Settlement Agreement, to contract for the 
necessary capacity requirements for the period from 
June 1, 2008,

157 

  
 
 
 
 
  
 
 
 
 
   
 
 
  
 
 
 
 
  
 
 
 
 
 
 
 
 
 
through May 31, 2009. Marketing Company and UE were two 
of the winning suppliers in the Ameren Illinois Utilities’ 
capacity RFPs. Marketing Company contracted to supply a 
portion of the Ameren Illinois Utilities’ capacity for $6 million. 
In addition, UE contracted to supply a portion of the Ameren 
Illinois Utilities’ capacity for $1 million.  

CIPS, CILCO and IP, as electric load serving entities, 
must acquire capacity sufficient to meet their obligations to 
customers. In 2009, the Ameren Illinois Utilities used an RFP 
process, administered by the IPA, to contract the necessary 
capacity for the period from June 1, 2009, through May 31, 
2012. Both Marketing Company and UE were winning 
suppliers in the Ameren Illinois Utilities’ capacity RFP 
process. In April 2009, Marketing Company contracted to 
supply capacity to the Ameren Illinois Utilities for $4 million, 
$9 million, and $8 million for the twelve months ending 
May 31, 2010, 2011, and 2012, respectively. In April 2009, 
UE contracted to supply capacity to the Ameren Illinois 
Utilities for $2 million, $2 million, and $1 million for the twelve 
months ending May 31, 2010, 2011, and 2012, respectively.  

Energy Swaps  

As part of the 2007 Illinois Electric Settlement 

Agreement, the Ameren Illinois Utilities entered into financial 
contracts with Marketing Company (for the benefit of Genco 
and AERG), to lock in energy prices for 400 to 1,000 
megawatts annually of their round-the-clock power 
requirements during the period June 1, 2008, to 
December 31, 2012, at then-relevant market prices. These 
financial contracts do not include capacity, are not load-
following products, and do not involve the physical delivery of 
energy. These financial contracts are derivative instruments. 
They are accounted for as cash flow hedges by Marketing 
Company and as derivatives subject to regulatory deferral by 
Ameren Illinois Utilities. Consequently, the Ameren Illinois 
Utilities and Marketing Company record the fair value of the 
contracts on their respective balance sheets and the changes 
to the fair value in regulatory assets or liabilities for the 
Ameren Illinois Utilities and OCI at Marketing Company. See 
Note 7 – Derivative Financial Instruments for additional 
information on these derivatives. Below are the remaining 
contracted volumes and prices per megawatthour as of 
December 31, 2009:  

Period 
January 1, 2010 – May 31, 2010 ..................     800 MW   
June 1, 2010 – December 31, 2010 .............   1,000 MW   
January 1, 2011 – December 31, 2011 .........   1,000 MW   
January 1, 2012 – December 31, 2012 .........   1,000 MW   

Volume 

Price per 
Megawatthour 
$   51.09 
  51.09 
  52.06 
  53.08 

To replace the supply contracts that expired on May 31, 

2008, the Ameren Illinois Utilities used RFP processes in 
early 2008, pursuant to the 2007 Illinois Electric Settlement 
Agreement, to contract for the necessary financial energy 
swaps requirement for the period from June 1, 2008, through 
May 31, 2009. Marketing Company was one of the winning 
suppliers in the Ameren Illinois Utilities’ energy swap RFP 
process. Marketing Company entered into financial 
instruments that fixed the price that the Ameren Illinois 

Utilities paid for about two million megawatthours at 
approximately $60 per megawatthour.  

CIPS, CILCO and IP, as electric load serving entities, 
must acquire energy sufficient to meet their obligations to 
customers. In 2009, the Ameren Illinois Utilities used an RFP 
process, administered by the IPA, to procure financial energy 
swaps from June 1, 2009, through May 31, 2011. Marketing 
Company was a winning supplier in the Ameren Illinois 
Utilities’ energy swap RFP process. In May 2009, Marketing 
Company entered into financial instruments that fixed the 
price that the Ameren Illinois Utilities will pay for 
approximately 80,000 megawatthours at approximately 
$48 per megawatthour during the twelve months ending 
May 31, 2010 and for approximately 89,000 megawatthours 
at approximately $48 per megawatthour during the twelve 
months ending May 31, 2011.  

Electric Resource Sharing Agreement  

On June 1, 2008, FERC accepted an electric resource 

sharing agreement among the Ameren Illinois Utilities for 
various joint costs of the Ameren Illinois Utilities, including 
capacity, renewable energy credits, and rate swaps. The 
purpose of the agreement is to allocate these costs among 
the Ameren Illinois Utilities in an equitable manner, based on 
their respective retail loads.  

Interconnection and Transmission Agreements  

UE, CIPS and IP are parties to an interconnection 
agreement for the use of their respective transmission lines 
and other facilities for the distribution of power. In addition, 
CILCO and IP, and CILCO and CIPS, are parties to similar 
interconnection agreements. These agreements have no 
contractual expiration date, but may be terminated by any 
party with three years’ notice.  

Generator Interconnection Agreement  

In 2008, Genco and CIPS signed an agreement requiring 

Genco to fund the construction costs of upgrades to CIPS’ 
transmission system. The transmission upgrades were 
required to support the additional electric power upgrades 
made at Genco’s Coffeen power plant. Under the agreement, 
Genco paid CIPS for the costs of the transmission upgrades. 
When the transmission assets were placed in service, CIPS 
paid Genco, with interest, for the costs of the transmission 
upgrades. In 2009, CIPS paid Genco $2 million when the 
transmission assets were placed in service. These 
transactions were eliminated in consolidation on Ameren’s 
financial statements.  

In September 2009, Marketing Company and CIPS 
signed an agreement requiring Marketing Company to fund 
the cost of certain upgrades to CIPS’ electric transmission 
system. Under the agreement, Marketing Company paid 
CIPS $5 million for the costs of the transmission upgrades. 
These amounts were a contribution in aid of construction and 
will not be refunded to Marketing Company. These 
transactions were eliminated in consolidation on Ameren’s 
financial statements.

158 

  
 
 
 
 
 
 
 
  
  
Joint Ownership Agreement  

In 2006, IP and AITC entered into a joint ownership 
agreement to construct, own, operate, and maintain certain 
electric transmission systems in Illinois. Under the terms of 
this agreement, IP and AITC are responsible for their 
applicable share of all costs related to the construction, 
operation, and maintenance of electric transmission systems. 
This agreement will terminate when either IP or AITC is the 
sole owner of the transmission systems or when the 
transmission systems are decommissioned.  

Support Services Agreements  

Ameren Services and AFS provide support services to 
their affiliates. Ameren Energy, Inc. provided support services 
until December 31, 2007. The cost of support services, 
including wages, employee benefits, professional services, 
and other expenses, are based on, or are an allocation of, 
actual costs incurred.  

CILCO Support Services  

On January 1, 2009, approximately 570 Ameren 
Services employees who provided support services to the 
Ameren Illinois Utilities were transferred to CILCO (Illinois 
Regulated). As CILCO employees, they provide services to 
CIPS and IP as well as to CILCO. The cost of support 
services provided by CILCO to CIPS and IP, including 
wages, employee benefits, professional services, and other 
expenses, are based on, or are an allocation of, actual costs 
incurred.  

Executory Tolling, Gas Sales, and Transportation 
Agreements  

Prior to 2009, under an executory tolling agreement, 
CILCO purchased steam, chilled water, and electricity from 
Medina Valley. In January 2009, CILCO transferred the 
tolling agreement to Marketing Company. In connection with 
the tolling agreement, Medina Valley purchases gas to fuel its 
generating facility from AFS under a fuel supply and services 
agreement.  

Under a gas transportation agreement, Genco acquires 

gas transportation service from UE for its Columbia, Missouri, 
CTs. This agreement expires in February 2016.  

Money Pools  

See Note 5 – Long-term Debt and Equity Financings for 

discussion of affiliate borrowing arrangements.  

Intercompany Borrowings  

On May 1, 2005, Genco issued to CIPS an amended and 

restated subordinated promissory note in the principal 
amount of $249 million with an interest rate of 7.125% per 
year. Interest income and charges for this note recorded by 
CIPS and Genco, respectively, were $4 million, $7 million, 
and $10 million for the years ended December 31, 2009, 
2008, and 2007, respectively. Genco’s subordinated note 
payable to CIPS associated with the transfer in 2000 of CIPS’ 
electric generating assets and related liabilities to Genco 
matures on May 1, 2010.  

CILCO (AERG) had outstanding borrowings from 
Ameren of $288 million at December 31, 2009, and had no 
outstanding borrowings directly from Ameren at 
December 31, 2008. The average interest rate on these 
borrowings was 6.1% for the year ended December 31, 2009. 
CILCO (AERG) recorded interest charges of $13 million for 
Ameren borrowings for the year ended December 31, 2009.  

UE had no outstanding borrowings directly from Ameren 

at December 31, 2009, and had outstanding borrowings 
directly from Ameren of $92 million at December 31, 2008. 
The average interest rate on these borrowings was 1.2% for 
the year ended December 31, 2009 (2008 – 3.6%). UE 
recorded interest charges of less than $1 million, $1 million, 
and $4 million for Ameren borrowings for the years ended 
December 31, 2009, 2008, and 2007, respectively.  

Collateral Postings  

Under the terms of the power supply agreements 

between Marketing Company and the Ameren Illinois Utilities, 
which were entered into as part of the September 2006 
Illinois power procurement auction, collateral must be posted 
by Marketing Company under certain market conditions to 
protect the Ameren Illinois Utilities in the event of 
nonperformance by Marketing Company. The collateral 
postings are unilateral, which means that Marketing 
Company as the supplier is the only counterparty required to 
post collateral. At December 31, 2009 and 2008, there were 
no collateral postings necessary by Marketing Company 
related to the 2006 auction power supply agreements.  

Under the terms of the 2008 Illinois power procurement 

RFPs, collateral had to be posted by Marketing Company 
and the Ameren Illinois Utilities under certain market 
conditions. The collateral postings were bilateral, which 
means that either counterparty could be required to post 
collateral. As of December 31, 2008, the Ameren Illinois 
Utilities had cash collateral postings as follows with Marketing 
Company: CIPS – $7 million, CILCO – $4 million, and IP – 
$11 million. These bilateral collateral postings were 
eliminated in consolidation on Ameren’s financial statements.  

Under the terms of the 2009 Illinois power procurement 

agreements entered into through an RFP process 
administered by the IPA, suppliers must post collateral under 
certain market conditions to protect the Ameren Illinois 
Utilities in the event of nonperformance. The collateral 
postings are unilateral, which means only the suppliers are 
required to post collateral. Therefore, UE, as a winning 
supplier of capacity, and Marketing Company, as a winning 
supplier of capacity and financial energy swaps, may be 
required to post collateral. As of December 31, 2009, there 
were no collateral postings necessary between UE and the 
Ameren Illinois Utilities or between Marketing Company and 
the Ameren Illinois Utilities related to the 2009 Illinois power 
procurement agreements.

159 

  
  
Operating Leases  

Under an operating lease agreement, Genco leased 
certain CTs at a Joppa, Illinois, site to its former parent, 
Development Company, for an initial term of 15 years, 
expiring September 30, 2015. Under an electric power 
supply agreement with Marketing Company, Development 
Company supplied the capacity and energy from these 
leased units to Marketing Company, which in turn supplied 
the energy to Genco. By mutual agreement of the parties, 
this lease agreement and this power supply agreement 
were terminated in February 2008, when an internal 
reorganization merged Development Company into 
Resources Company. Genco recorded operating revenues 
from the lease agreement of $2 million and $11 million for 
the years ended December 31, 2008 and 2007, 
respectively.  

Intercompany Transfers  

On January 1, 2008, UE transferred its interest in 
Union Electric Development Corporation at book value to 
Ameren by means of a $3 million dividend-in-kind. On 
March 31, 2008, Union Electric Development Corporation 

was merged into Ameren Development Company, with 
Ameren Development Company surviving the merger.  
On February 29, 2008, UE contributed its 40% 
ownership interest in EEI, book value of $39 million, to 
Resources Company, in exchange for a 50% interest in 
Resources Company, and then immediately transferred its 
interest in Resources Company to Ameren by means of a 
$39 million dividend-in-kind. Also on February 29, 2008, 
Development Company, which formerly held a 40% 
ownership interest in EEI, merged into Ameren Energy 
Resources Company, which then merged into Resources 
Company. As a result, Resources Company had an 80% 
ownership interest in EEI.  

On January 1, 2010, as part of an internal 

reorganization, Resources Company transferred its 80% 
ownership interest in EEI to Genco, through a capital 
contribution. The transfer of EEI to Genco was accounted 
for as a transaction between entities under common 
control, whereby Genco recognized the assets and 
liabilities of EEI at their book value as of January 1, 2010.

The following table presents the impact on UE, CIPS, Genco, CILCO, and IP of related party transactions for the 
years ended December 31, 2009, 2008 and 2007. It is based primarily on the agreements discussed above and the 
money pool arrangements discussed in Note 4 – Credit Facility Borrowings and Liquidity.  

                         Agreement 
Genco and AERG power supply 
agreements with Marketing Company 

UE ancillary services and capacity 
agreements with CIPS, CILCO and IP 

UE and Genco gas transportation 
agreement 

Genco gas sales to Medina Valley 
Genco gas sales to distribution companies 

CILCO support services(b) 

Total Operating Revenues 

UE and Genco gas transportation 
agreement 

CIPS, CILCO and IP agreements with 
Marketing Company 

CIPS, CILCO and IP ancillary services and 
capacity agreements with UE 

Ancillary services agreement with 
Marketing Company 

Executory tolling agreement with Medina 
Valley 

Total Purchased Power 

Income Statement Line  Item 
Operating Revenues 

Operating Revenues 

Operating Revenues 

Operating Revenues 
Operating Revenues 

Operating Revenues 

Fuel 

Purchased Power 

Purchased Power 

Purchased Power 

Purchased Power 

Insurance recoveries 

Operating Revenues and 
Purchased Power 

160 

2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2009  
2008  
2009  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  
2009  
2008  
2007  

UE 
(a) 
$ 
(a) 
(a) 
3  
  13  
  18  
1  
1  
1  
(a) 
(a) 
(a) 
(a) 
$  4  
  14  
  19  
(a) 
$ 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
-  
(c) 
(12) 

$ 

$ 

$ 

$ 

$ 

CIPS 
(a ) 
$ 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
$  140  
  145  
  157  
1  
4  
6  
(c ) 
6  
3  
(a ) 
(a ) 
(a ) 
$  141  
  155  
  166  
(a ) 
$ 
(a ) 
(a ) 

Genco 
$  850  
  893  
  831  
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
1  
2  
7  
(a) 
$   853  
  900  
  831  
1  
$ 
1  
1  
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
-  
(11) 
(2) 

$ 

$ 

$ 

CILCO 
$  430  
  344  
  279  
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
(a) 
70  
$  500  
  344  
  279  
(a) 
$ 
(a) 
(a) 
$  65  
65  
76  
(c) 
2  
3  
(c) 
3  
1  
(d) 
39  
38  
$  65  
  109  
  118  
-  
$ 
(4) 
(7) 

IP 

$ 

$ 

$ 

(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
(a ) 
$   195  
204  
227  
1  
7  
9  
(c ) 
8  
4  
(a ) 
(a ) 
(a ) 
$  196  
219  
240  
(a ) 
(a ) 
(a ) 

$ 

  
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                         Agreement 

Income Statement Line  Item 

UE 

CIPS 

Genco 

CILCO 

IP 

Gas purchases from Genco 

Gas Purchased for Resale 

Ameren Services support services 
agreement 

CILCO support services 

Ameren Energy, Inc. support services 
agreement(e)  
AFS support services agreement 

Insurance premiums(f) 

Total Other Operations and 
Maintenance Expenses  

Money pool borrowings (advances) 

Other Operations and 
Maintenance 

Other Operations and 
Maintenance 
Other Operations and 
Maintenance 
Other Operations and 
Maintenance 

Other Operations and 
Maintenance 

Interest (Charges) 
Income 

  2009   
  2008   
  2009   
  2008   
  2007   
  2009   

  2007   

  2009   
  2008   
  2007   
  2009   
  2008   
  2007   
  2009   
  2008   
  2007   
  2009   
  2008   
  2007   

$ 

(a) 
(a) 
$   126  
  130  
  137  
(a) 

$ 

(a ) 
(c ) 
$    29  
50  
47   
21  

8  

(a ) 

$ 

$ 

(a) 
(a) 
  27  
28  
24  
(a) 

(c) 

7  
7  
6  
2  
8  
19  
$  135  
  145  
  170  
(c) 
$ 
(c) 
(c) 

2  
2  
2   
(a ) 
(a ) 
(a ) 
$  52   
52   
49   
(c ) 
(c ) 
(c ) 

$ 

3  
3  
2  
1  
4  
4  
31  
35  
30  
(1) 
(c) 
8  

$ 

$ 

$ 

2  
6  
$    33  
51  
49  
(a) 

(a) 

2  
2  
2  
1  
3  
2  
$  36  
56  
53  
(1) 
(c) 
(c) 

$ 

$ 

(c ) 
(a ) 
$    48  
76  
73  
32  

(a ) 

3  
2  
2  
(a ) 
(a ) 
(a ) 
$  83  
78  
75  
(c ) 
(c ) 
1  

$ 

Includes revenues relating to Property and Plant additions during 2009 (CIPS – $6 million and IP – $11 million).  
In January 2009, CILCO transferred the tolling agreement to Marketing Company.  

(a)  Not applicable.  
(b) 
(c)  Amount less than $1 million.  
(d) 
(e)  Ameren Energy, Inc. was eliminated December 31, 2007, through an internal reorganization.  
(f)  Represents insurance premiums paid to Energy Risk Assurance Company, an affiliate for replacement power, property damage and terrorism coverage.  

NOTE 15 – COMMITMENTS AND CONTINGENCIES  

We are involved in legal, tax and regulatory proceedings before various courts, regulatory commissions, and 
governmental agencies with respect to matters that arise in the ordinary course of business, some of which involve 
substantial amounts of money. We believe that the final disposition of these proceedings, except as otherwise disclosed in 
these notes to our financial statements, will not have a material adverse effect on our results of operations, financial 
position, or liquidity.  

See also Note 1 – Summary of Significant Accounting Policies, Note 2 – Rate and Regulatory Matters, Note 14 – 

Related Party Transactions and Note 16 – Callaway Nuclear Plant in this report.  

Callaway Nuclear Plant  

The following table presents insurance coverage at UE’s Callaway nuclear plant at December 31, 2009. The property 

coverage and the nuclear liability coverage must be renewed on October 1 and January 1, respectively, of each year.  
Type and Source of Coverage 
Maximum Assessments for Single  Incidents 
Public liability and nuclear worker liability: 

Maximum Coverages 

American Nuclear Insurers ...................................................................               $        300(a) 
Pool participation ..................................................................................                    12,219(b) 
            $   12,519(d) 
Nuclear Electric Insurance Ltd. .............................................................               $     2,750(e) 
Nuclear Electric Insurance Ltd. .............................................................               $        490(f) 
Energy Risk Assurance Company ........................................................                $          64(g) 

Property damage: 
Replacement power: 

                                   $      - 
                                        118(c) 
                                   $  118 
                                   $    23 
                                   $      9 
                                   $      - 

(a)  Effective January 1, 2010, limit was increased to $375 million.  
(b)  Provided through mandatory participation in an industry-wide retrospective premium assessment program.  
(c)  Retrospective premium under Price-Anderson. This is subject to retrospective assessment with respect to a covered loss in excess of $300 million in the 

event of an incident at any licensed U.S. commercial reactor, payable at $17.5 million per year.  

(d)  Limit of liability for each incident under the Price-Anderson liability provisions of the Atomic Energy Act of 1954, as amended. A company could be assessed 
up to $118 million per incident for each licensed reactor it operates with a maximum of $17.5 million per incident to be paid in a calendar year for each 
reactor. This limit is subject to change to account for the effects of inflation and changes in the number of licensed reactors.  
for losses in excess of the $500 million primary coverage.  

(e)  Provides for $500 million in property damage and decontamination, excess property insurance, and premature decommissioning coverage up to $2.25 billion 

161 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
  
  
  
  
  
  
  
  
  
(f)  Provides the replacement power cost insurance in the event of a prolonged accidental outage at our nuclear plant. Weekly indemnity of $4.5 million for 52 

weeks, which commences after the first eight weeks of an outage, plus $3.6 million per week for 71.1 weeks thereafter.  

(g)  Provides the replacement power cost insurance in the event of a prolonged accidental outage at our nuclear plant. The coverage commences after the first 

52 weeks of insurance coverage from Nuclear Electric Insurance Ltd. and is for a weekly indemnity of $900,000 for 71 weeks in excess of the $3.6 million per 
week set forth above. Energy Risk Assurance Company is an affiliate and has reinsured this coverage with third-party insurance companies. See Note 14 – 
Related Party Transactions for more information on this affiliate transaction.  
The Price-Anderson Act is a federal law that limits the liability for claims from an incident involving any licensed United 

States commercial nuclear power facility. The limit is based on the number of licensed reactors. The limit of liability and 
the maximum potential annual payments are adjusted at least every five years for inflation to reflect changes in the 
Consumer Price Index. The five-year inflationary adjustment as prescribed by the most recent Price-Anderson Act 
renewal was effective October 29, 2008. Owners of a nuclear reactor cover this exposure through a combination of private 
insurance and mandatory participation in a financial protection pool, as established by Price-Anderson.  

After the terrorist attacks on September 11, 2001, Nuclear Electric Insurance Ltd. confirmed that losses resulting from 

terrorist attacks would be covered under its policies. However, Nuclear Electric Insurance Ltd. imposed an industry-wide 
aggregate policy limit of $3.24 billion within a 12-month period for coverage for such terrorist acts.  

If losses from a nuclear incident at the Callaway nuclear plant exceed the limits of, or are not subject to, insurance, or 
if coverage is unavailable, UE is at risk for any uninsured losses. If a serious nuclear incident were to occur, it could have 
a material adverse effect on Ameren’s and UE’s results of operations, financial position, or liquidity.  

Leases  

The following table presents our lease obligations at December 31, 2009:  

Total 

Less than 1 Year 

1 - 3 Years 

3 - 5 Years 

After 5 Years 

Ameren:(a)  
Capital lease payments(b) ..................................................  
Less amount representing interest ....................................  
Present value of minimum capital lease payments ............  
Operating leases(c) ............................................................  
Total lease obligations ......................................................  
UE: 
Capital lease payments(b) ..................................................  
Less amount representing interest ....................................  
Present value of minimum capital lease payments ............  
Operating leases(c) ............................................................  
Total lease obligations ......................................................  
CIPS: 
Operating leases(c) ............................................................  
Genco: 
Operating leases(c) ............................................................  
CILCO: 
Operating leases(c) ............................................................  
IP: 
Operating leases(c) ............................................................  

$  685 
  367 
  318 
  351 
$  669 

$  685 
  367 
  318 
  157 
$   475 

$ 

2 

$  133 

$  16 

$  32 
  28 
4 
  37 
$  41 

$  32 
  28 
4 
  14 
$   18 

$ 

- 

$  9 

$  1 

$  65 
55 
10 
59 
$  69 

$  65 
55 
10 
25 
$    35 

$ 

1 

$  17 

$ 

2 

3 

$  65 
55 
10 
52 
$  62 

$  65 
55 
10 
25 
$    35 

$ 

1 

$  17 

$ 

2 

$ 

1 

$  523 
229 
294 
203 
$  497 

$  523 
229 
294 
93 
$    387 

$ 

- 

$ 

90 

$ 

11 

$ 

- 

$ 
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

$  2 

$ 

6 

(a) 
(b)  See Properties under Part I, Item 2, and Note 3 – Property and Plant, Net of this report for additional information.  
(c)  Amounts related to certain real estate leases and railroad licenses have indefinite payment periods. Ameren’s $2 million annual obligation for these items is 
included in the Less than 1 Year, 1-3 Years, and 3-5 Years columns. Amounts for After 5 Years are not included in the total because that period is indefinite.  

162 

  
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
  
We lease various facilities, office equipment, plant equipment, and rail cars under operating leases. The following 

table presents total rental expense, included in other operations and maintenance expenses, for the years ended 
December 31, 2009, 2008 and 2007:  

Ameren(a)  ...............................................................................................................................................................  
UE  .........................................................................................................................................................................  
CIPS .......................................................................................................................................................................  
Genco .....................................................................................................................................................................  
CILCO ....................................................................................................................................................................  
IP   .........................................................................................................................................................................  
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  
(a) 

2009 
$   27 
  19 
6 
5 
6 
9 

2008 
$   19 
  20 
9 
2 
7 
  13 

2007 
$   15 
  19 
9 
2 
7 
  12 

Other Obligations  

To supply a portion of the fuel requirements of our generating plants, we have entered into various long-term 

commitments for the procurement of coal, natural gas, nuclear fuel, and methane gas. We also have entered into various 
long-term commitments for the purchase of electric capacity and natural gas for distribution. The table below presents our 
estimated fuel, electric capacity, and other commitments at December 31, 2009. Ameren’s and UE’s electric capacity 
obligations include a 15-year, 102-MW power purchase agreement with a wind farm operator. Included in the Other 
column are minimum purchase commitments under contracts for equipment, design and construction, meter reading 
services, and an Ameren tax credit obligation at December 31, 2009. Ameren’s tax credit obligation is a $51 million note 
payable issued for an investment in a commercial real estate development partnership to acquire tax credits. This note 
payable was netted against the related investment in Other Assets at December 31, 2009, as Ameren has a legally 
enforceable right to offset under authoritative accounting guidance.  

In September 2009, UE announced an agreement with a landfill owner to install CTs at a landfill site in St. Louis 
County, Missouri, which would generate approximately 15 MW of electricity by burning methane gas collected from the 
landfill. Construction of the CTs is expected to begin in 2010, and the CTs are expected to begin generating power in 
2011. UE signed a 20-year supply agreement with the landfill owner to purchase methane gas. The obligation information 
presented below includes total estimated methane gas purchase commitments. Related design and construction 
commitments associated with this project are included in the Other column in the table below.  

Ameren:(a)  
2010 .............................................  
2011 .............................................  
2012 .............................................  
2013 .............................................  
2014 .............................................  
Thereafter .....................................  
Total .............................................  
UE: 
2010 .............................................  
2011 .............................................  
2012 .............................................  
2013 .............................................  
2014 .............................................  
Thereafter .....................................  
Total .............................................  
CIPS: 
2010 .............................................  
2011 .............................................  
2012 .............................................  
2013 .............................................  
2014 .............................................  
Thereafter .....................................  
Total .............................................  

Coal 

$ 

987 
874 
639 
218 
120 
675 
$   3,513 

$ 

527 
447 
265 
142 
106 
597 
$  2,084 

$ 

$ 

- 
- 
- 
- 
- 
- 
- 

Natural 
Gas 

$ 

580 
461 
317 
205 
121 
214 
$   1,898 

$ 

$ 

$ 

$ 

83 
63 
50 
39 
27 
52 
314 

91 
74 
64 
48 
37 
10 
324 

Nuclear 

Electric 
Capacity 

Methane 
Gas 

Other 

Total 

$ 

22  
22  
22  
22  
22  
207  
$    317  

$ 

22  
22  
22  
22  
22  
207  
$  317  

$ 

$ 

(b) 
(b) 
(b) 
-  
-  
-  
(b) 

$ 

- 
1 
3 
3 
4 
101 
$    112 

$ 

- 
1 
3 
3 
4 
101 
$  112 

$ 

$ 

- 
- 
- 
- 
- 
- 
- 

$  70 
85 
75 
58 
68 
  254 
$   610 

$  42 
54 
43 
42 
52 
  154 
$  387 

$ 

2 
2 
2 
2 
2 
12 
$  22 

$ 

$ 

$ 

$ 

$ 

$ 

1,714 
1,459 
1,099 
561 
435 
1,780 
  7,048 

729 
603 
426 
303 
311 
1,440 
3,812 

93 
76 
66 
50 
39 
22 
346 

$  55 
16 
43 
55 
  100 
  329 
$   598 

$  55 
16 
43 
55 
  100 
  329 
$  598 

$ 

$ 

- 
- 
- 
- 
- 
- 
- 

163 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Coal 

Natural 
Gas 

Nuclear 

Electric 
Capacity 

Methane 
Gas 

Other 

Total 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

- 
- 
- 
- 
- 
- 
- 

- 
- 
- 
- 
- 
- 
- 

-  
-  
-  
-  
-  
-  
-  

10 
10 
5 
3 
3 
3 
34 

-   
-   
-   
-   
-   
-   
-   

223 
192 
167 
32 
- 
- 
614 

Genco: 
2010 .............................................  
2011 .............................................  
2012 .............................................  
2013 .............................................  
2014 .............................................  
Thereafter .....................................  
Total .............................................  
CILCO: 
2010 .............................................  
2011 .............................................  
2012 .............................................  
2013 .............................................  
2014 .............................................  
Thereafter .....................................  
Total .............................................  
IP: 
2010 .............................................  
2011 .............................................  
2012 .............................................  
2013 .............................................  
2014 .............................................  
Thereafter .....................................  
Total .............................................  
(a) 
(b)  See Ameren Illinois Utilities’ Purchase Power Agreements below for additional information regarding electric capacity commitments.  

$ 
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.  

6   
10   
11   
11   
11   
69   
$   118   

1   
3   
3   
3   
3   
19   
$  32   

169 
136 
96 
68 
37 
94 
$      600 

93 
103 
87 
36 
14 
78 
$      411 

(b ) 
(b ) 
(b ) 
-  
-  
        -  
(b ) 
$ 

- 
- 
- 
- 
- 
- 
$         - 

- 
- 
- 
- 
- 
- 
$         - 

220 
176 
100 
48 
17 
54 
615 

(b ) 
(b ) 
(b ) 
-  
-  
-  
(b ) 

- 
- 
- 
- 
- 
- 
- 

- 
- 
- 
- 
- 
- 
- 

- 
- 
- 
- 
- 
- 
- 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

$ 

233 
202 
172 
35 
3 
3 
648 

$ 

263 
242 
186 
107 
54 
191 
$   1,043 

$ 

$ 

226 
186 
111 
59 
28 
123 
733 

Ameren Illinois Utilities’ Power Purchase Agreements  

Beginning on January 1, 2007, CIPS, CILCO and IP 
were required to obtain all electric supply requirements for 
customers who do not purchase electric supply from third-
party suppliers. The power procurement costs incurred by 
CIPS, CILCO and IP are passed directly to their 
customers. CIPS, CILCO and IP entered into power 
supply contracts with the winning bidders, including their 
affiliate, Marketing Company, in the Illinois reverse power 
procurement auction held in September 2006. Under 
these contracts, the electric suppliers are responsible for 
providing to CIPS, CILCO and IP energy, capacity, certain 
transmission, volumetric risk management, and other 
services necessary for the Ameren Illinois Utilities to serve 
the electric load needs of residential and small commercial 
customers (with less than one megawatt of demand) at an 
all-inclusive fixed price. These contracts commenced on 
January 1, 2007 with one-third of the supply contracts 
expiring in each of May 2008, 2009 and 2010.  

Existing supply contracts from the September 2006 

auction remain in place. Through the Illinois procurement 
auction held in September 2006, CIPS, CILCO and IP 
contracted for their anticipated fixed-price loads for 
residential and small commercial customers (less than 
one megawatt of demand) as follows:  

Term 
CIPS’ load in megawatts(a) .................................  
CILCO’s load in megawatts(a) .............................  
IP’s load in megawatts(a) ....................................  
Total load in megawatts(a) ..................................  
Cost per megawatthour ......................................  
(a)  Represents peak forecast load for CIPS, CILCO and IP. Actual load 

41 Months Ending 
May 31, 2010 
639 
328 
928 
  1,895 
$   66.05 

could be different if customers elect not to purchase power pursuant to 
the power procurement auction but instead to receive power from a 
different supplier. Load could also be affected by weather, among other 
things.  
In January 2009, the ICC approved the electric 

power procurement plan filed by the IPA for both the 
Ameren Illinois Utilities and Commonwealth Edison 
Company. As a result, in the second quarter of 2009, the 
IPA procured electric capacity, financial energy swaps, 
and renewable energy credits through an RFP process 
on behalf of the Ameren Illinois Utilities. Electric capacity 
was procured in April 2009 for the period June 1, 2009, 
through May 31, 2012. The Ameren Illinois Utilities 
contracted to purchase between 800 and 3,500 MW of 
capacity per month at an average price of approximately 
$41 per MW-day over the three-year period. Financial 
energy swaps were procured in 

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May 2009 for the period June 1, 2009, through May 31, 
2011. The Ameren Illinois Utilities contracted to purchase 
approximately ten million megawatthours of financial 
energy swaps at an average price of approximately $36 
per megawatthour. Renewable energy credits were 
procured in May 2009 for the period June 1, 2009, through 
May 31, 2010. The Ameren Illinois Utilities contracted to 
purchase 720,000 renewable energy credits at an average 
price of approximately $16 per credit. For additional 
information regarding electric capacity and financial 
energy swaps entered into with UE and Marketing 
Company, see Note 14 – Related Party Transactions. The 
following table presents the Ameren Illinois Utilities’ 
commitments for these contracts at December 31, 2009:  

Electric capacity ..................................   $  26   
Financial energy swaps .......................  
  183   
Renewable energy credits ...................  
6   

2010 

2011 
$    26   
56   
-   

2012 
$  1 
- 
- 

2007 Illinois Electric Settlement Agreement  

The 2007 Illinois Electric Settlement Agreement 
provided $1 billion of funding over a four-year period 
beginning in 2007 for rate relief for certain electric 
customers in Illinois. Funding for the settlement is 
provided by electric generators in Illinois and certain 
Illinois electric utilities. The Ameren Illinois Utilities, 
Genco, and AERG agreed to fund an aggregate of $150 
million, of which the following contributions remain to be 
made at December 31, 2009:  

Ameren  CIPS 

  $   0.3   

2010(a)  ........   $  3.0 
(a)  Estimated.  

CILCO 
(Illinois 
Regulated)  
$   0.2 

CILCO 
(AERG) 
  $  0.5   $   1.4   $  0.6  

IP  Genco 

Also as part of the 2007 Illinois Electric Settlement 

Agreement, the Ameren Illinois Utilities entered into 
financial contracts with Marketing Company to lock in 
energy prices for 400 to 1,000 megawatts annually of their 
round-the-clock power requirements from 2008 to 2012. 
See Note 7 – Derivative Financial Instruments and Note 
14 – Related Party Transactions for additional information.  

Environmental Matters  

We are subject to various environmental laws and 
regulations enforced by federal, state and local authorities. 
From the beginning phases of siting and development to 
the ongoing operation of existing or new electric 
generating, transmission and distribution facilities, natural 
gas storage facilities, and natural gas transmission and 
distribution facilities, our activities involve compliance with 
diverse laws and regulations. These laws and regulations 
address noise, emissions, impacts to air, land and water, 
protected and cultural resources (such as wetlands, 
endangered species, and archeological and historical 
resources), and chemical and waste handling. Complex 
and lengthy processes are required to obtain approvals, 
permits, or licenses for new, existing, or modified facilities. 
Additionally, the use and handling of various chemicals or 
hazardous materials (including wastes) requires release 

prevention plans and emergency response procedures. As 
new laws or regulations are promulgated, we assess their 
applicability and implement the necessary modifications to 
our facilities or our operations. The more significant 
matters are discussed below.  

Clean Air Act  

Both federal and state laws require significant 
reductions in SO2 and NOx emissions that result from 
burning fossil fuels. In May 2005, the EPA issued 
regulations with respect to SO2 and NOx emissions (the 
Clean Air Interstate Rule) and mercury emissions (the 
Clean Air Mercury Rule). The federal Clean Air Interstate 
Rule requires generating facilities in 28 eastern states, 
which include Missouri and Illinois, where our generating 
facilities are located, and the District of Columbia to 
participate in cap-and-trade programs to reduce annual 
SO2 emissions, annual NOx emissions, and ozone season 
NOx emissions. The cap-and-trade program for both 
annual and ozone season NOx emissions went into effect 
on January 1, 2009. The SO2 emissions cap-and-trade 
program is scheduled to take effect in 2010.  

In February 2008, the U.S. Court of Appeals for the 
District of Columbia issued a decision that vacated the 
federal Clean Air Mercury Rule. The court ruled that the 
EPA erred in the method it used to remove electric 
generating units from the list of sources subject to the 
MACT requirements under the Clean Air Act. In February 
2009, the U.S. Supreme Court denied a petition for review 
filed by a group representing the electric utility industry. 
The impact of this decision is that the EPA will move 
forward with a MACT standard for mercury emissions and 
other hazardous air pollutants, such as acid gases. In a 
consent order, the EPA agreed to propose the regulation 
by March 2011 and finalize the regulation by November 
2011. Compliance is expected to be required in 2015. We 
cannot predict at this time the estimated capital or 
operating costs for compliance with such future 
environmental rules.  

In July 2008, the U.S. Court of Appeals for the District 

of Columbia issued a decision that vacated the federal 
Clean Air Interstate Rule. The court ruled that the 
regulation contained several fatal flaws, including a 
regional cap-and-trade program that cannot be used to 
facilitate the attainment of ambient air quality standards for 
ozone and fine particulate matter. In September 2008, the 
EPA, as well as several environmental groups, a group 
representing the electric utility industry, and the National 
Mining Association, all filed petitions for rehearing with the 
U.S. Court of Appeals. In December 2008, the U.S. Court 
of Appeals essentially reversed its July 2008 decision to 
vacate the federal Clean Air Interstate Rule. The U.S. 
Court of Appeals granted the EPA petition for 
reconsideration and remanded the rule to the EPA for 
further action to remedy the rule’s flaws in accordance 
with the U.S. Court of Appeals’ July 2008 opinion in the 
case. The impact of the decision is that the existing Illinois 
and Missouri rules to implement the

165 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
federal Clean Air Interstate Rule will remain in effect until 
the federal Clean Air Interstate Rule is revised by the 
EPA, at which point the Illinois and Missouri rules may be 
subject to change. The EPA has stated that it expects to 
issue a new proposed version of the Clean Air Interstate 
Rule in 2010 and a final version in 2011.  

The state of Missouri has adopted rules to implement 

the federal Clean Air Interstate Rule for regulating SO2 
and NOx emissions from electric generating units. The 
rules are a significant part of Missouri’s plan to attain 
existing ambient standards for ozone and fine particulates, 
as well as meeting the federal Clean Air Visibility Rule. 
The rules are expected to reduce NOx emissions by 30% 
and SO2 emissions by 75% by 2015. As a result of the 
Missouri rules, UE will use allowances and install pollution 
control equipment. UE’s costs to comply with SO2 
emission reductions required by the Clean Air Interstate 
Rule could increase materially if the EPA determines that 
existing allowances granted to sources under the Acid 
Rain Program cannot be used for compliance with the 
Clean Air Interstate Rule or if a new allowance program is 
mandated by revisions to the Clean Air Interstate Rule. 
Missouri also adopted rules to implement the federal 
Clean Air Mercury Rule. However, these rules are not 
enforceable as a result of the U.S. Court of Appeals 
decision to vacate the federal Clean Air Mercury Rule.  

We do not believe that the court decision that vacated 
the federal Clean Air Mercury Rule will significantly affect 
pollution control obligations in Illinois in the near term. 
Under the MPS, as amended, Illinois generators may 
defer until 2015 the requirement to reduce mercury 
emissions by 90%, in exchange for accelerated installation 
of NOx and SO2 controls. This rule, when fully 
implemented, is expected to reduce mercury emissions by 
90%, NOx emissions by 50%, and SO2 emissions by 70% 
by 2015 in Illinois. To comply with the rule, Genco, CILCO 
(AERG) and EEI have begun putting into service 
equipment designed to reduce mercury emissions. Genco, 
CILCO (AERG) and EEI will also need to install additional 
pollution control equipment. Current plans include 
installing scrubbers for SO2 reduction as well as optimizing 
operations of selective catalytic reduction (SCR) systems 
for NOx reduction at certain coal-fired plants in Illinois. The 
Illinois Joint Committee on Administrative Rules approved 
a rule amendment in June 2009 that revised certain 
requirements of the MPS. As a result, Genco and CILCO 
(AERG) collectively were able to defer to subsequent 
years an estimated $300 million of environmental capital 
expenditures originally scheduled for 2009 through 2011.  
In March 2008, the EPA finalized regulations that will 

lower the ambient standard for ozone. Illinois and Missouri 
have each submitted their recommendations to the EPA 
for designating nonattainment areas. A final action by the 
EPA to designate nonattainment areas is expected in 
March 2010. State implementation plans will need to be 
submitted in 2013 unless Illinois and Missouri seek 
extensions for various requirement dates. Additional 

emission reductions may be required as a result of future 
state implementation plans. In January 2010, the EPA 
announced its plans to revise the ozone standard to a 
level lower than the level set in 2008. At this time, we are 
unable to determine the impact state implementation plans 
for such regulations would have on our results of 
operations, financial position, and liquidity.  

The table below presents estimated capital costs that 

are based on current technology to comply with state air 
quality implementation plans, the MPS, federal ambient air 
quality standards including ozone and fine particulates, 
and the federal Clean Air Visibility rule. The estimates 
shown in the table below could change depending upon 
additional federal or state requirements, the requirements 
under a MACT standard, new technology, variations in 
costs of material or labor, or alternative compliance 
strategies, among other factors. The timing of estimated 
capital costs may also be influenced by whether emission 
allowances are used to comply with any future rules, 
thereby deferring capital investment. During 2009, Ameren 
identified significant opportunities to defer or reduce 
planned capital spending, which are reflected in the 
estimates provided in the table. The capital cost estimates 
are lower than previously anticipated, in part because of 
Ameren’s ability to manage its generating fleet to minimize 
emissions while complying with emission limits and air 
permit requirements. Furthermore, previous estimates 
included assumptions about potential and developing air 
regulations, including rules that were subsequently 
vacated by the courts. These estimates include capital 
spending to comply primarily with existing and known 
regulations as of December 31, 2009.  

Total 

2011 - 2014 

2015 - 2017 

2010 
UE(a)  ..................   $  160 
  $    170 – 
  $    215 
650 – 
95 
Genco ................    
785 
120 – 
5 
CILCO(AERG).............  
150 
5 
EEI  ....................    
275 – 
335 
Ameren ..............   $  265 
  $ 1,215 – 
  $ 1,485 
(a)  UE’s expenditures are expected to be recoverable from ratepayers.  
Emission Allowances  

 $  35   $  355 – 
775 – 
190 – 
280 – 
 $  150   $  1,600 – 

 $  25 – 
30 – 
65 – 
0 – 
 $  120 – 

35    
75    
5    

 $  410 
915 
230 
345 
 $  1,900 

Both federal and state laws require significant 
reductions in SO2 and NOx emissions that result from 
burning fossil fuels. The Clean Air Act created marketable 
commodities called allowances under the Acid Rain 
Program, the NOx Budget Trading Program, and the 
federal Clean Air Interstate Rule. All existing generating 
facilities have been allocated allowances based on past 
production and the statutory emission reduction goals. 
NOx allowances allocated under the NOx Budget Trading 
Program can be used for the seasonal NOx program under 
the federal Clean Air Interstate Rule. Our generating 
facilities comply with the SO2 limits through the use and 
purchase of allowances, through the use of low-sulfur 
fuels, and through the application of pollution control 
technology. Our generating

166 

  
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
  
  
facilities are expected to comply with the NOx limits 
through the use and purchase of allowances or through 
the application of pollution control technology, including 
low-NOx burners, over-fire air systems, combustion 
optimization, rich-reagent injection, selective noncatalytic 
reduction, and selective catalytic reduction systems.  
See Note 1 – Summary of Significant Accounting 

Policies for the SO2 and NOx emission allowances held 
and the related SO2 and NOx emission allowance book 
values that were classified as intangible assets as of 
December 31, 2009.  

UE, Genco, CILCO (AERG) and EEI expect to use a 

substantial portion of their SO2 and NOx allowances for 
ongoing operations. Environmental regulations, including 
the Clean Air Interstate Rule, the timing of the installation 
of pollution control equipment, and the level of operations, 
will have a significant impact on the number of allowances 
actually required for ongoing operations. The Clean Air 
Interstate Rule requires a reduction in SO2 emissions by 
increasing the ratio of Acid Rain Program allowances 
surrendered. The current Acid Rain Program requires the 
surrender of one SO2 allowance for every ton of SO2 
emitted. Unless revised by the EPA as a result of the U.S. 
Court of Appeals’ remand, the Clean Air Interstate Rule 
program will require that SO2 allowances of vintages 2010 
through 2014 be surrendered at a ratio of two allowances 
for every ton of emission. SO2 allowances with vintages of 
2015 and beyond will be required to be surrendered at a 
ratio of 2.86 allowances for every ton of emission. In order 
to accommodate this change in surrender ratio and to 
comply with the federal and state regulations, UE, Genco, 
CILCO (AERG), and EEI expect to install control 
technology designed to further reduce SO2 emissions, as 
discussed above.  

The Clean Air Interstate Rule has both an ozone 

season program and an annual program for regulating 
NOx emissions, with separate allowances issued for each 
program. The Clean Air Interstate Rule ozone season 
program replaced the NOx Budget Trading Program 
beginning in 2009. Allocations for UE’s Missouri 
generating facilities for the years 2009 through 2014 were 
11,665 tons per ozone season and 26,842 tons annually. 
Allocations for Genco’s generating facility in Missouri were 
one ton for the ozone season and three tons annually. 
Allocations for UE’s, Genco’s, CILCO’s (AERG), and EEI’s 
Illinois generating facilities for the years 2010 and 2011 
were 90, 3,442, 1,368, and 1,758 tons per ozone season, 
respectively, and 93, 8,302, 3,419, and 4,565 tons 
annually, respectively.  

Global Climate Change  

In June 2009, the U.S. House of Representatives 
passed energy legislation entitled “The American Clean 
Energy and Security Act of 2009” that, if enacted, would 
establish an economy-wide cap-and-trade program. The 
overarching goal of this proposed cap-and-trade program 
is to reduce greenhouse gas emissions from capped 
sources, including coal-fired electric generation units, to 
3% below  

2005 levels by 2012, 17% below 2005 levels by 2020, 
42% below 2005 levels by 2030, and 83% below 2005 
levels by the year 2050. The proposed legislation provides 
an allocation of free emission allowances and greenhouse 
gas offsets to utilities, as well as certain merchant coal-
fired electric generators in competitive markets. This 
aspect of the proposed legislation would mitigate some of 
the cost of compliance for the Ameren Companies. 
However, the amount of free allowances decline over time 
and are ultimately phased out. The proposed legislation 
also contains, among other things, a federal renewable 
energy standard of 6% by 2012 that increases gradually to 
20% by 2020, of which up to 25% of the goal can be met 
by energy efficiency. The proposed legislation also 
establishes performance standards for new coal plants, 
requires electric utilities to develop plans to support plug-
in hybrid vehicles, and requires load-serving entities to 
reduce peak electric demand through energy efficiency 
and Smart Grid technologies. In September 2009, climate 
change legislation entitled “The Clean Energy Jobs and 
American Power Act” was introduced in the U.S. Senate 
that was similar to that passed by the U.S. House of 
Representatives in June 2009, although it proposes a 
slightly greater reduction in greenhouse gas emissions in 
the year 2020 and grants fewer emission allowances to 
the electricity sector. Under both proposed pieces of 
legislation, large sources of CO2 emissions will be required 
to obtain and retire an allowance for each ton of CO2 
emitted. The allowances may be allocated to the sources 
without cost, sold to the sources through auctions or other 
mechanisms, or traded among parties. “The Clean Energy 
Jobs and American Power Act” was voted out of 
committee in November 2009. In December 2009, 
Senators Kerry, Graham and Lieberman introduced a 
framework for Senate legislation in 2010. The framework 
lacks specifics, but it is consistent with the House-passed 
legislation except that it emphasizes the need for greater 
support for nuclear power and energy independence 
through support for clean energy and drilling for oil and 
natural gas. Senate leadership has stated that 
consideration of climate legislation will be postponed until 
spring 2010. In addition, the reduction of greenhouse gas 
emissions has been identified as a high priority by 
President Obama’s administration. Although we cannot 
predict the date of enactment or the requirements of any 
future climate change legislation or regulations, we believe 
it is possible that some form of federal legislation or 
regulations to control emissions of greenhouse gases will 
become law during the current administration.  

Potential impacts from climate change legislation 
could vary, depending upon proposed CO2 emission limits, 
the timing of implementation of those limits, the method of 
distributing allowances, the degree to which offsets are 
allowed and available, and provisions for cost containment 
measures, such as a “safety valve” provision that provides 
a maximum price for emission allowances. As a result of 
our diverse fuel portfolio, our emissions of greenhouse 
gases vary among our generating facilities, but coal-fired 
power plants are significant sources of CO2 , a principal 
greenhouse gas. Ameren’s analysis shows that if either 

167 

“The American Clean Energy and Security Act of 2009” or 
“The Clean Energy Jobs and American Power Act” were 
enacted into law in its current form, household costs and 
rates for electricity could rise significantly. The burden could 
fall particularly hard on electricity consumers and upon the 
economy in the Midwest because of the region’s reliance on 
electricity generated by coal-fired power plants. Natural gas 
emits about half the amount of CO2 that coal emits when 
burned to produce electricity. As a result, economy-wide 
shifts favoring natural gas as a fuel source for electricity 
generation also could affect the cost of heating for our utility 
customers and many industrial processes. Ameren believes 
that wholesale natural gas costs could rise significantly as 
well. Higher costs for energy could contribute to reduced 
demand for electricity and natural gas.  

In early December of 2009, representatives from 

countries around the globe met in Copenhagen, Denmark, to 
attempt to develop an international treaty to supersede the 
Kyoto Protocol, which set mandatory greenhouse gas 
reduction requirements for participating countries. The parties 
were unable to reach agreement regarding mandatory 
greenhouse gas emissions reductions. However, certain 
countries, including the United States, entered into an 
agreement called the “Copenhagen Accord.” The 
Copenhagen Accord provides a mechanism for countries to 
make economy-wide greenhouse gas emission mitigation 
commitments for reducing emissions of greenhouse gases by 
2020 and provides for developed countries to fund 
greenhouse gas emissions mitigation projects in developing 
countries. Any commitment under the Copenhagen Accord is 
subject to congressional action on climate change.  

Additional requirements to control greenhouse gas 
emissions and address global climate change may also arise 
pursuant to the Midwest Greenhouse Gas Reduction Accord, 
an agreement signed by the governors of Illinois, Iowa, 
Kansas, Michigan, Wisconsin and Minnesota to develop a 
strategy to achieve energy security and to reduce 
greenhouse gas emissions through a cap-and-trade 
mechanism. The advisory group to the Midwest governors 
provided draft final recommendations on the design of a 
greenhouse gas reduction program in June 2009. In October 
2009, the Midwestern Governors Association held a forum to 
review some of the advisory group’s recommendations. The 
October 2009 forum did not yield any significant updates to 
the Midwest Greenhouse Gas Reduction Accord’s work 
toward a cap-and-trade mechanism. The recommendations 
have not been endorsed or approved by the individual state 
governors. It is uncertain whether legislation to implement the 
recommendations will be implemented or passed by any of 
the states, including Illinois.  

With regard to the control of greenhouse gas emissions 

under federal regulation, in 2007, the U.S. Supreme Court 
issued a decision finding that the EPA has the authority to 
regulate CO2 and other greenhouse gases from automobiles 
as “air pollutants” under the Clean Air Act. This decision 
required the EPA to determine whether greenhouse gas 
emissions may reasonably be anticipated to endanger public 

health or welfare, or, in the alternative, to provide a 
reasonable explanation as to why greenhouse gas emissions 
should not be regulated. In December 2009, in response to 
the decision of the U.S. Supreme Court, the EPA issued its 
“endangerment finding” determining that greenhouse gas 
emissions, including CO2 , endanger human health and 
welfare and that emissions of greenhouse gases from motor 
vehicles contribute to that endangerment. It is expected that 
the EPA will issue a rule by the end of March 2010 to control 
greenhouse gas emissions from light-duty vehicles such as 
automobiles. Once this rule is effective, greenhouse gases 
will, for the first time, be a regulated air pollutant under the 
Clean Air Act. The EPA has taken the position that the 
regulation of greenhouse gas emissions from new motor 
vehicles under the Clean Air Act will trigger the applicability of 
other Clean Air Act provisions, such as the Title V Operating 
Permit Program and the NSR provisions, which apply to 
greenhouse gas emissions from stationary sources. This 
would include fossil-fuel-fired electricity generating plants.  

Recognizing the difficulties presented by regulating at 

once virtually all emitters of greenhouse gases, the EPA 
announced in September 2009 a proposed rule, known as 
the “tailoring rule,” that would establish new higher thresholds 
for regulating greenhouse gas emissions from stationary 
sources, such as power plants. The rule would require any 
source that emits at least 25,000 tons per year of greenhouse 
gases measured as CO2 equivalents (CO2 e) to have an 
operating permit under Title V Operating Permit Program of 
the Clean Air Act. Sources that already have an operating 
permit would have greenhouse gas-specific provisions added 
to their permits upon renewal. Currently, all Ameren power 
plants have operating permits that, depending on the final 
rule, may be modified when they are renewed to address 
greenhouse gas emissions. The proposed tailoring rule also 
provides that if physical changes or changes in operation at 
major sources result in an increase in emissions of 
greenhouse gases over a threshold ranging from 10,000 tons 
to 25,000 tons of CO2 e, the emitters would be required to 
obtain a permit under the NSR/Prevention of Significant 
Deterioration program and to install the best available 
technology to control greenhouse gas emissions. New major 
sources also would be required to obtain such a permit and 
to install the best available control technology. The EPA has 
committed to provide guidance about the best available 
control technology for new and modified major sources of 
greenhouse gas emissions. The tailoring rule is expected to 
be finalized in March 2010, but any federal climate change 
legislation that is enacted may preempt the proposed rule, 
particularly as it relates to power plant greenhouse gas 
emissions. This proposed rule has no immediate impact on 
Ameren’s, UE’s, Genco’s or CILCO’s (AERG) generating 
facilities. The extent to which this proposed rule could have a 
material impact on our generating facilities depends upon 
future EPA guidelines as to what constitutes the best 
available control technology for greenhouse gas emissions 
from power plants, whether physical changes or change in 
operation subject to the rule 

168 

 
  
would occur at our power plants, and whether federal 
legislation that preempts the proposed rule is passed.  

The EPA also finalized regulations in September 2009 
that would require certain categories of businesses, including 
fossil-fuel-fired power plants, to monitor and report their 
annual greenhouse gas emissions, beginning in January 
2011 for 2010 emissions. CO2 emissions from fossil-fuel-fired 
power plants subject to the Clean Air Act’s acid rain program 
have been monitored and reported for over fifteen years. 
Thus, this new rule covering greenhouse gas emissions is 
not expected to have a material effect on our operations. It 
will require additional reporting of greenhouse gas emissions 
from various gas operations and possibly other minor 
sources within our system.  

Recent federal appellate court decisions have ruled that 

common law causes of action, such as nuisance, can be 
used to redress damages resulting from global climate 
change. In State of Connecticut v. American Electric Power 
(“AEP”), the U.S. Court of Appeals for the Second Circuit 
ruled in September 2009 that public nuisance claims brought 
by states, New York City and public land trusts could proceed 
and were not beyond the scope of judicial relief. Ameren’s 
generating plants were not named in the AEP litigation. In 
Comer v. Murphy Oil (“Comer”), a Mississippi property owner 
sued several industrial companies, alleging that CO2 
emissions created the atmospheric conditions, that resulted 
in Hurricane Katrina. The U.S. Court of Appeals for the Fifth 
Circuit issued a ruling in Comer in October 2009 that permits 
this cause of action to proceed. Comer is seeking class 
action certification on behalf of similarly situated property 
owners. Additional legal challenges and appeals are 
expected in both the Comer and AEP cases. The rulings in 
these cases may spur other claimants to file suit against 
greenhouse gas emitters, including Ameren. The courts did 
not rule on the merits of the lawsuits, only that plaintiffs had 
standing to pursue their claims. Under some of the versions 
of greenhouse gas legislation currently pending in Congress, 
nuisance claims could be rendered moot. We are unable to 
predict the outcome of lawsuits seeking damages that 
litigants claim are attributable to climate change and their 
impact on our results of operations, financial position, and 
liquidity.  

Future federal and state legislation or regulations that 

mandate limits on the emission of greenhouse gases would 
result in significant increases in capital expenditures and 
operating costs, which, in turn, could lead to increased 
liquidity needs and higher financing costs. Moreover, to the 
extent we request recovery of these costs through rates, our 
regulators might deny some or all of, or defer timely recovery 
of, these costs. Excessive costs to comply with future 
legislation or regulations might force UE, Genco, CILCO 
(through AERG) and EEI as well as other similarly situated 
electric power generators to close some coal-fired facilities 
and could lead to possible impairment of assets and reduced 
revenues. As a result, mandatory limits could have a material 
adverse impact on Ameren’s, UE’s, Genco’s, AERG’s and 
EEI’s results of operations, financial position, and liquidity.  

The impact on us of future initiatives related to 
greenhouse gas emissions and global climate change is 
unknown. Although compliance costs are unlikely in the near 
future, federal legislative, federal regulatory and state-
sponsored initiatives to control greenhouse gases continue to 
progress, making it more likely that some form of greenhouse 
gas emissions control will eventually be required. Since these 
initiatives continue to evolve, the impact on our coal-fired 
generation plants and our customers’ costs is unknown, but 
any impact would likely be negative. Our costs of complying 
with any mandated federal or state greenhouse gas program 
could have a material impact on our future results of 
operations, financial position, and liquidity.  

NSR and Notice of Violation  

The EPA is engaged in an enforcement initiative targeted 

at coal-fired power plants in the United States to determine 
whether those power plants failed to comply with the 
requirements of the NSR and New Source Performance 
Standards (NSPS) provisions under the Clean Air Act when 
the plants implemented modifications. The EPA’s inquiries 
focus on whether projects performed at power plants should 
have triggered various permitting requirements and the 
installation of pollution control equipment.  

In April 2005, Genco received a request from the EPA for 
information pursuant to Section 114(a) of the Clean Air Act. It 
sought detailed operating and maintenance history data with 
respect to Genco’s Coffeen, Hutsonville, Meredosia and 
Newton facilities, EEI’s Joppa facility, and AERG’s E.D. 
Edwards and Duck Creek facilities. In 2006, the EPA issued 
a second Section 114(a) request to Genco regarding projects 
at the Newton facility. All of these facilities are coal-fired 
power plants. In September 2008, the EPA issued a third 
Section 114(a) request regarding projects at all of Ameren’s 
Illinois coal-fired power plants. In May 2009, we completed 
our response to the most recent information request, but we 
are unable to predict the outcome of this matter.  

In January 2010, UE received a Notice of Violation from 

the EPA alleging violations of the Clean Air Act’s NSR and 
Title V programs. In the Notice of Violation, the EPA 
contends that various maintenance, repair and replacement 
projects at UE’s Labadie, Meramec, Rush Island, and Sioux 
coal-fired power plant facilities, dating back to the mid-1990s, 
triggered NSR requirements. The EPA alleges that UE 
violated the Title V operating permit program by failing to 
include such NSR requirements in its operating permits or 
applications for those permits. If litigation regarding this 
matter occurs, it could take many years to resolve the 
underlying issues alleged in the Notice of Violation. UE 
believes its defenses to the allegations described in the 
Notice of Violation are meritorious and will defend itself 
vigorously; however, there can be no assurances that it will 
be successful in its efforts.  

Resolution of these matters could have a material 
adverse impact on the future results of operations, financial 
position, and liquidity of Ameren, UE, Genco, AERG and

169 

  
  
  
EEI. A resolution could result in increased capital 
expenditures for the installation of control technology, 
increased operations and maintenance expenses, and fines 
or penalties.  

Clean Water Act  

In July 2004, the EPA issued rules under the Clean 
Water Act that require cooling-water intake structures to have 
the best technology available for minimizing adverse 
environmental impacts on aquatic species. These rules 
pertain to all existing generating facilities that currently 
employ a cooling-water intake structure whose flow exceeds 
50 million gallons per day. The rules may require facilities to 
install additional technology on their cooling water intakes or 
take other protective measures and to do extensive site-
specific study and monitoring. There is also the possibility 
that the rules may lead to the installation of cooling towers on 
some of our generating facilities. On April 1, 2009, the U.S. 
Supreme Court ruled that the EPA can compare the costs of 
technology for protecting aquatic species to the benefits of 
that technology in order to establish the “best technology 
available” standards applicable to the cooling water intake 
structure at existing power plants under the Clean Water Act. 
The EPA is expected to propose revised rules in 2010. Until 
the EPA reissues the rules and such rules are adopted, and 
until the studies on the aquatic impacts of the power plants 
are completed, we are unable to estimate the costs of 
complying with these rules. Such costs are not expected to 
be incurred prior to 2012. All major generation facilities at UE, 
Genco, AERG and EEI with cooling water systems could be 
subject to these new regulations.  

Remediation  

We are involved in a number of remediation actions to 
clean up hazardous waste sites as required by federal and 
state law. Such statutes require that responsible parties fund 
remediation actions regardless of their degree of fault, the 
legality of original disposal, or the ownership of a disposal 
site. UE, CIPS, CILCO and IP have each been identified by 
the federal or state governments as a potentially responsible 
party (PRP) at several contaminated sites. Several of these 
sites involve facilities that were transferred by CIPS to Genco 
in May 2000 and facilities transferred by CILCO to AERG in 
October 2003. As part of each transfer, CIPS and CILCO 
have contractually agreed to indemnify Genco and AERG, 
respectively, for remediation costs associated with 
preexisting environmental contamination at the transferred 
sites.  

As of December 31, 2009, CIPS, CILCO and IP owned 
or were otherwise responsible for several former MGP sites 
in Illinois. CIPS has 15, CILCO has 4, and IP has 25 sites. All 
of these sites are in various stages of investigation, 
evaluation, and remediation. Ameren currently anticipates 
completion of remediation at these sites by 2015, except for a 
CIPS site that is expected to be completed by 2017. The ICC 
permits each company to recover remediation and litigation 
costs associated with its former MGP sites from its Illinois 
electric and natural gas utility customers through 

environmental adjustment rate riders. To be recoverable, 
such costs must be prudently and properly incurred. Costs 
are subject to annual review by the ICC. As of December 31, 
2009, estimated obligations were: CIPS – $47 million to $62 
million, CILCO – less than $1 million, and IP – $112 million to 
$175 million. CIPS, CILCO and IP have liabilities of $47 
million, less than $1 million, and $112 million, respectively, 
recorded to represent estimated minimum obligations, as no 
other amount within the range was a better estimate. In 2009, 
after the completion of site investigations and the selection of 
remediated actions, CIPS and IP increased their remediation 
liabilities.  

CIPS is also responsible for the cleanup of a former coal 

ash landfill in Coffeen, Illinois. As of December 31, 2009, 
CIPS estimated that obligation at $0.5 million to $6 million. 
CIPS recorded a liability of $0.5 million to represent its 
estimated minimum obligation for this site, as no other 
amount within the range was a better estimate. IP is also 
responsible for the cleanup of a landfill, underground storage 
tanks, and a water treatment plant in Illinois. As of 
December 31, 2009, IP recorded a liability of $0.8 million to 
represent its best estimate of the obligation for these sites.  

In addition, UE owns or is otherwise responsible for 10 

MGP sites in Missouri and one site in Iowa. UE does not 
currently have in effect in Missouri a rate rider mechanism 
that permits recovery of remediation costs associated with 
MGP sites from utility customers. UE does not have any retail 
utility operations in Iowa that would provide a source of 
recovery of these remediation costs. As of December 31, 
2009, UE estimated its obligation at $3 million to $5 million. 
UE has a liability of $3 million recorded to represent its 
estimated minimum obligation for its MGP sites, as no other 
amount within the range was a better estimate.  

UE also is responsible for four waste sites in Missouri 

that have corporate cleanup liability as a result of federal 
agency mandates. UE concluded cleanups at two of these 
sites, and no further remediation actions are anticipated at 
those two sites. One of the remaining waste sites for which 
UE has corporate cleanup responsibility is a former coal tar 
distillery located in St. Louis, Missouri. In July 2008, the EPA 
issued an administrative order to UE pertaining to this 
distillery operated by Koppers Company or its predecessor 
and successor companies. UE is the current owner of the 
site, but UE did not conduct any of the manufacturing 
operations involving coal tar or its byproducts. UE along with 
two other PRPs have reached an agreement with the EPA 
about the scope of the site investigation. The investigation 
will occur later this year. As of December 31, 2009, UE 
estimated this obligation at $2 million to $5 million. UE has a 
liability of $2 million recorded to represent its estimated 
minimum obligation, as no other amount within the range was 
a better estimate.  

In June 2000, the EPA notified UE and numerous other 

companies, including Solutia, that former landfills and 
lagoons in Sauget, Illinois, may contain soil and groundwater 
contamination. These sites are known as Sauget Area 2.

170 

  
  
From about 1926 until 1976, UE operated a power 
generating facility adjacent to Sauget Area 2. UE currently 
owns a parcel of property that was once used as a landfill. 
Under the terms of an Administrative Order and Consent, 
UE has joined with other PRPs to evaluate the extent of 
potential contamination with respect to Sauget Area 2.  
The Sauget Area 2 investigations overseen by the 

EPA have been completed. The results have been 
submitted to the EPA and a record of decision is expected 
in 2010. Once the EPA has selected a remedy, it will 
begin negotiations with various PRPs to implement it. 
Over the last several years, numerous other parties have 
joined the PRP group and all presumably will participate in 
the funding of any required remediation. In addition, 
Pharmacia Corporation and Monsanto Company have 
agreed to assume the liabilities related to Solutia’s former 
chemical waste landfill in the Sauget Area 2, 
notwithstanding Solutia’s filing for bankruptcy protection. 
As of December 31, 2009, UE estimated its obligation at 
$0.4 million to $10 million. UE has a liability of $0.4 million 
recorded to represent its estimated minimum obligation, 
as no other amount within the range was a better 
estimate.  

In December 2004, AERG submitted a plan to the 
Illinois EPA to address groundwater and surface water 
issues associated with the recycle pond, ash ponds, and 
reservoir at the Duck Creek power plant facility. 
Information submitted by AERG is currently under review 
by the Illinois EPA. CILCO (AERG) has a liability of $3 
million at December 31, 2009, for the estimated cost of the 
remediation effort, which involves discharging recycle-
system water into the Duck Creek reservoir and the 
eventual closure of ash ponds in order to address these 
groundwater and surface water issues.  

Our operations or those of our predecessor 

companies involve the use, disposal of, and in appropriate 
circumstances, the cleanup of substances regulated under 
environmental protection laws. We are unable to 
determine whether such practices will result in future 
environmental commitments or impact our results of 
operations, financial position, or liquidity.  

Ash Management  

There has been increased activity at both state and 
federal levels to examine the need for additional regulation 
of ash pond facilities and coal combustion byproducts 
(CCB) and wastes. The EPA is considering regulating 
CCB under the hazardous waste regulations, which could 
impact future disposal and handling costs at our power 
plant facilities. We believe it is likely that the EPA will 
continue to allow some beneficial use, such as recycling, 
of CCB without classifying them as hazardous wastes. As 
part of its proposed regulations, the EPA is considering 
requirements that coal-fired power plants engage in the 
mandatory closure of active surface impoundments used 
for the management of CCB. In September 2009, the EPA 
announced that it expects to revise federal rules governing 
wastewater discharges from coal-fired power plants. 

Some form of additional regulation concerning ash ponds, 
and the handling and disposal of CCB and waste, is 
expected to be proposed in early 2010. Depending upon 
the scope and timing of these rules, Ameren may be 
required to alter the management of CCB waste, including 
beneficial reuse, and to discontinue or phase out the use 
of the ash ponds. Ameren’s CCB impoundments were not 
identified in the EPA’s 2009 list of 44 high-hazard potential 
impoundments containing CCB.  

In addition, the Illinois EPA has requested that UE, 
Genco, CILCO (AERG) and EEI establish groundwater 
monitoring plans for their active and inactive ash 
impoundments in Illinois. Genco is currently petitioning the 
Illinois Pollution Control Board to issue a site specific rule 
approving the closure of an ash pond at its Hutsonville 
power plant. Ameren has entered into discussions with the 
Illinois EPA about a framework for closure of additional 
ash ponds in Illinois, including the ash ponds at Venice 
and Duck Creek, when such facilities are ultimately taken 
out of service. The permits for the Venice and Duck Creek 
ash ponds both expire in 2010. UE, Genco and CILCO 
(AERG) have recorded AROs, based on current laws, for 
the estimated costs of the retirement of their ash ponds.  
At this time, we are unable to predict the effects any 

such state and federal regulations might have on our 
results of operations, financial position, and liquidity.  

Pumped-storage Hydroelectric Facility Breach  

In December 2005, there was a breach of the upper 

reservoir at UE’s Taum Sauk pumped-storage 
hydroelectric facility. This resulted in significant flooding in 
the local area, which damaged a state park. UE settled 
with FERC and the state of Missouri all issues associated 
with the December 2005 Taum Sauk incident.  

UE has property and liability insurance coverage for 

the Taum Sauk incident, subject to certain limits and 
deductibles. Insurance does not cover lost electric 
margins and penalties paid to FERC. UE expects that the 
total cost for cleanup, damage and liabilities, excluding 
costs to rebuild the upper reservoir, will be approximately 
$205 million. As of December 31, 2009, UE had paid 
$205 million, including costs resulting from the FERC-
approved stipulation and consent agreement. As of 
December 31, 2009, UE had recorded expenses of 
$35 million, primarily in prior years, for items not covered 
by insurance and had recorded a $170 million receivable 
for amounts recoverable from insurance companies under 
liability coverage. As of December 31, 2009, UE had 
received $100 million from insurance companies, which 
reduced the insurance receivable balance subject to 
liability coverage to $70 million.  

UE received approval from FERC to rebuild the upper 

reservoir at its Taum Sauk plant and is in the process of 
testing the rebuilt facility. UE expects the Taum Sauk plant 
to become operational in the second quarter of 2010. The 
estimated cost to rebuild the upper reservoir is in the 
range of $490 million. As of December 31, 2009, UE had 
recorded

171 

a $420 million receivable due from insurance companies 
under property insurance coverage related to the 
rebuilding of the facility and the reimbursement of 
replacement power costs. As of December 31, 2009, UE 
had received $362 million from insurance companies, 
which reduced the property insurance receivable balance 
as of December 31, 2009, to $58 million.  

Under UE’s insurance policies, all claims by or against 

UE are subject to review by its insurance carriers. In July 
2009, three insurance carriers filed a petition against 
Ameren in the Circuit Court of St. Louis County, Missouri, 
seeking a declaratory judgment that the property 
insurance policy does not require these three insurers to 
indemnify Ameren for their share of the entire cost of 
construction associated with the facility rebuild design 
being utilized. The three insurers allege that they, along 
with the other policy participants, presented a rebuild 
design that was consistent with their insurance coverage 
obligations and that the insurance policies do not require 
these insurers to pay their share of the costs of 
construction associated with the design being used. These 
insurers have estimated a cost of approximately $214 
million for their rebuild design compared to the estimated 
$490 million cost of the design approved by FERC and 
implemented by Ameren. Ameren has filed an answer and 
counterclaim in the Circuit Court of St. Louis County, 
Missouri, against these insurers. The counterclaim asserts 
that the three insurance carriers have breached their 
obligations under the property insurance policies issued to 
Ameren and UE. Ameren seeks payment of a sum to-be-
determined for all amounts covered by these policies 
incurred in the facility rebuild, including power 
replacement costs, interest, and attorneys’ fees. The 
insurers that are parties to the litigation represent 
approximately 40%, on a weighted average basis, of the 
property insurance policy coverage between the disputed 
amounts of $214 million and $490 million.  

On August 31, 2009, Ameren and the property 
insurance carriers that are not parties to the above 
litigation (the “Settling Insurance Companies”) reached a 
settlement of any and all claims, liabilities, and obligations 
arising out of, or relating to, coverage under its property 
insurance policy, including those related to the rebuilding 
of the facility and the reimbursement of replacement 
power costs. All payments from the Settling Insurance 
Companies were received by UE in September 2009.  
Until Ameren’s remaining insurance claims and the 
related litigation are resolved, among other things, we are 
unable to determine the total impact the breach could 
have on Ameren’s and UE’s results of operations, financial 
position, and liquidity beyond those amounts already 
recognized. Ameren and UE expect to recover, through 
insurance, 80% to 90% of the total property insurance 
claim for the Taum Sauk incident. Beyond insurance, the 
recoverability of any Taum Sauk facility rebuild costs from 
customers is subject to the terms and conditions set forth 
in UE’s November 2007 State of Missouri settlement 
agreement. In that settlement, UE agreed that it would not 

attempt to recover from rate payers costs incurred in the 
reconstruction expressly excluding, however, 
enhancements, costs incurred due to circumstances or 
conditions that were not at that time reasonably 
foreseeable and costs that would have been incurred 
absent the Taum Sauk incident. Certain costs associated 
with the Taum Sauk facility not recovered from property 
insurers may be recoverable from UE’s electric customers 
through rates established in rate cases filed subsequent to 
the in-service date of the rebuilt facility. As of 
December 31, 2009, UE had capitalized in property and 
plant qualifying Taum Sauk- related costs of $99 million 
that UE believes qualify for potential recovery in electric 
rates under the terms of the November 2007 State of 
Missouri Settlement. The inclusion of such costs in UE’s 
electric rates is subject to review and approval by the 
MoPSC in a future rate case. Any amounts not recovered 
through insurance, in electric rates, or otherwise, could 
result in charges to earnings, which could be material.  

Asbestos-related Litigation  

Ameren, UE, CIPS, Genco, CILCO and IP have been 
named, along with numerous other parties, in a number of 
lawsuits filed by plaintiffs claiming varying degrees of 
injury from asbestos exposure. Most have been filed in the 
Circuit Court of Madison County, Illinois. The total number 
of defendants named in each case is significant; as many 
as 192 parties are named in some pending cases and as 
few as six in others. However, in the cases that were 
pending as of December 31, 2009, the average number of 
parties was 71.  

The claims filed against Ameren, UE, CIPS, Genco, 
CILCO and IP allege injury from asbestos exposure during 
the plaintiffs’ activities at our present or former electric 
generating plants. Former CIPS plants are now owned by 
Genco, and former CILCO plants are now owned by 
AERG. Most of IP’s plants were transferred to a former 
parent subsidiary prior to Ameren’s acquisition of IP. As a 
part of the transfer of ownership of the CIPS and CILCO 
generating plants, CIPS and CILCO have contractually 
agreed to indemnify Genco and AERG, respectively, for 
liabilities associated with asbestos-related claims arising 
from activities prior to the transfer. Each lawsuit seeks 
unspecified damages that, if awarded at trial, typically 
would be shared among the various defendants.  

The following table presents the pending asbestos-
related lawsuits filed against the Ameren Companies as of 
December 31, 2009:  

Specifically Named as Defendant 

Ameren 
1 

UE  CIPS  Genco  CILCO 
26 

15 

32 

- 

IP 
40 

Total(a)  
75   

(a)  Total does not equal the sum of the subsidiary unit lawsuits because 
some of the lawsuits name multiple Ameren entities as defendants.  
As of December 31, 2009, nine asbestos-related 
lawsuits were pending against EEI. The general liability 
insurance maintained by EEI provides coverage with 
respect to liabilities arising from asbestos-related claims. 

172 

  
 
 
 
 
 
 
 
  
 
 
At December 31, 2009, Ameren, UE, CIPS, CILCO 

and IP had liabilities of $14 million, $4 million, $3 million, 
$2 million and $5 million, respectively, recorded to 
represent their best estimate of their obligations related to 
asbestos claims.  

IP has a tariff rider to recover the costs of asbestos-

related litigation claims, subject to the following terms: 
90% of cash expenditures in excess of the amount 
included in base electric rates are recovered by IP from a 
trust fund established by IP. At December 31, 2009, the 
trust fund balance was approximately $23 million, 
including accumulated interest. If cash expenditures are 
less than the amount in base rates, IP will contribute 90% 
of the difference to the fund. Once the trust fund is 
depleted, 90% of allowed cash expenditures in excess of 
base rates will be recovered through charges assessed to 
customers under the tariff rider.  

The Ameren Companies believe that the final 

disposition of these proceedings will not have a material 
adverse effect on their results of operations, financial 
position, or liquidity.  

NOTE 16 – CALLAWAY NUCLEAR PLANT  

Under the Nuclear Waste Policy Act of 1982, the DOE 

is responsible for the permanent storage and disposal of 
spent nuclear fuel. The DOE currently charges one mill, or 
1/10 of one cent, per nuclear-generated kilowatthour sold 
for future disposal of spent fuel. Pursuant to this act, UE 
collects one mill from its electric customers for each 
kilowatthour of electricity that it generates and sells from 
its Callaway nuclear plant. Electric utility rates charged to 
customers provide for recovery of such costs. The DOE’s 
last announced date of when it expects a permanent 
storage facility for spent fuel to be available was 2020, 
and the DOE continues to evaluate permanent storage 
alternatives. UE has sufficient installed storage capacity at 
its Callaway nuclear plant until 2020. It has the capability 
for additional storage capacity through the licensed life of 
the plant. The delayed availability of the DOE’s disposal 
facility is not expected to adversely affect the continued 
operation of the Callaway nuclear plant through its 
currently licensed life.  

UE intends to submit a license extension application 

with the NRC to extend its Callaway nuclear plant’s 
operating license from 2024 to 2044. If the Callaway 
nuclear plant’s license is extended, additional spent fuel 
storage will be required. UE is evaluating the installation of 
a dry spent fuel storage facility at its Callaway nuclear plant.  
Electric utility rates charged to customers provide for 

the recovery of the Callaway nuclear plant’s 
decommissioning costs, which include decontamination, 
dismantling, and site restoration costs, over an assumed 
40-year life of the plant, ending with the expiration of the 
plant’s operating license in 2024. It is assumed that the 
Callaway nuclear plant site will be decommissioned based 
on the immediate dismantlement method and removed 
from service. Ameren and UE have recorded an ARO for 

the Callaway nuclear plant decommissioning costs at fair 
value, which represents the present value of estimated 
future cash outflows. Decommissioning costs are included 
in the costs of service used to establish electric rates for 
UE’s customers. These costs amounted to $7 million in 
each of the years 2009, 2008, and 2007. Every three 
years, the MoPSC requires UE to file an updated cost 
study for decommissioning its Callaway nuclear plant. 
Electric rates may be adjusted at such times to reflect 
changed estimates. The latest cost study, filed in 
September 2008, included minor tritium contamination 
discovered on the Callaway nuclear plant site, which did 
not result in a significant increase in the decommissioning 
cost estimate. Costs collected from customers are 
deposited in an external trust fund to provide for the 
Callaway nuclear plant’s decommissioning. If the assumed 
return on trust assets is not earned, we believe that it is 
probable that any such earnings deficiency will be 
recovered in rates. The fair value of the nuclear 
decommissioning trust fund for UE’s Callaway nuclear 
plant is reported as Nuclear Decommissioning Trust Fund 
in Ameren’s Consolidated Balance Sheet and UE’s 
Balance Sheet. This amount is legally restricted and may 
be used only to fund the costs of nuclear 
decommissioning. Changes in the fair value of the trust 
fund are recorded as an increase or decrease to the 
nuclear decommissioning trust fund, with an offsetting 
adjustment to the related regulatory asset. See Note 9 – 
Nuclear Decommissioning Trust Fund Investments for 
additional information.  

NOTE 17 – GOODWILL  

We evaluate goodwill for impairment as of October 31 

of each year, or more frequently if events and 
circumstances indicate that the asset might be impaired. 
Goodwill impairment testing is a two-step process. The 
first step involves a comparison of the estimated fair value 
of a reporting unit with its carrying amount. If the 
estimated fair value of the reporting unit exceeds the 
carrying value, goodwill of the reporting unit is considered 
unimpaired. If the carrying amount of the reporting unit 
exceeds its estimated fair value, a second step is 
performed to measure the amount of impairment, if any. 
The second step of the goodwill impairment test compares 
the implied fair value of the reporting unit’s goodwill with 
the carrying amount of that goodwill. The implied fair value 
of goodwill is determined by allocating the estimated fair 
value of the reporting unit to the estimated fair value of its 
existing assets and liabilities in a manner similar to a 
purchase price allocation. The unallocated portion of the 
estimated fair value of the reporting unit is the implied fair 
value of goodwill. If the implied fair value of goodwill is 
less than the carrying amount, an impairment loss 
equivalent to the difference is recorded as a reduction of 
goodwill and a charge to operating expense.  

During the first quarter of 2009, we concluded that 
events had occurred and circumstances had changed 
which 

173 

 
 
required us to perform an interim goodwill impairment test. 
The following events triggered this impairment test:  
  A significant decline in Ameren’s market capitalization.  
  The continuing decline in market prices for electricity.  
  A decrease in observable industry market multiples.  
The fair value of Ameren’s and IP’s reporting units 

was estimated based on a risk-adjusted, probability-
weighted discounted cash flow model that considered 
multiple operating scenarios. Key assumptions in the 
determination of fair value included the use of an 
appropriate discount rate, estimated five-year cash flows, 
and an exit value based on observable industry market 
multiples. We use our best estimates in making these 
evaluations. We consider various factors, including 
forward price curves for energy and fuel costs, the 
regulatory environment, and operating costs. For the 
interim test conducted as of March 31, 2009, the discount 
rate used was 3.8%, based on the 20-year treasury yield. 
To assess the reasonableness of the estimated reporting 
unit fair values, the sum of the estimated fair values of the 
Ameren reporting units is reconciled to our current market 
capitalization plus an estimated control premium. 
Ameren’s reporting units and IP’s reporting unit did not 
require a second step assessment; the results of the step 
one tests indicated no impairment of goodwill as of 
March 31, 2009.  

The annual impairment test, conducted as of 
October 31, 2009, did not result in a second step 
assessment; the test indicated no impairment of Ameren’s 
or IP’s goodwill. The annual test was conducted in a 
manner similar to the interim test described above. 
Ameren’s market capitalization was less than the book 
value of its equity as of the October 31, 2009, testing date 

and during the remainder of 2009. However, the sum of 
the estimated fair values of Ameren reporting units 
exceeded the combined Ameren reporting unit carrying 
value as of October 31, 2009. We believe the difference 
between Ameren’s market capitalization and the sum of 
the estimated fair values of the Ameren reporting units as 
of October 31, 2009, can be explained by the application 
of a reasonable control premium to our share price. The 
discount rate used was 4.2%, based on the 20-year 
treasury yield. At Ameren’s Illinois Regulated reporting 
unit and IP’s Illinois Regulated reporting unit, either (1) a 
decrease in the forecasted cash flows of ten percent, 
(2) an increase in the discount rate of one percentage 
point, or (3) a decrease of the market multiple by one 
would not have resulted in the carrying value of the 
reporting unit exceeding their fair values. However, the 
estimated fair value of Ameren’s Merchant Generation 
reporting unit exceeded its carrying value by a nominal 
amount as of October 31, 2009. The estimated fair value 
of Ameren’s Merchant Generation reporting unit exceeded 
its carrying value by approximately $95 million, or 3%. The 
failure in the future of any reporting unit to achieve 
forecasted operating results and cash flows or a decline of 
observable industry market multiples may further reduce 
its estimated fair value below its carrying value, which 
would likely result in the recognition of a goodwill 
impairment charge.  

Ameren and IP will continue to monitor the actual and 

forecasted operating results, cash flows, market 
capitalization, market prices for electricity, and observable 
industry market multiples of their reporting units for signs 
of possible declines in estimated fair value and potential 
goodwill impairment. 

Ameren has identified three reporting units, which also represent Ameren’s reportable segments. The Ameren 
reporting units are Missouri Regulated, Illinois Regulated, and Merchant Generation. IP has one reporting unit, Illinois 
Regulated. Ameren’s reporting units have been defined and goodwill has been evaluated at the operating segment level 
in accordance with authoritative accounting guidance. The following tables provide a reconciliation of the beginning and 
ending carrying amounts of goodwill by reporting unit, for Ameren and IP, for the years 2009 and 2008:  
Ameren  

2009 

2008 

Gross goodwill at January 1 .........................................  
Accumulated impairment losses ...................................  
Goodwill, net of accumulated impairment losses ..........  
Changes during the year ..............................................  
Goodwill, net of impairment losses at December 31 .....  

Illinois 
Regulated 
  $   411 
- 
  $  411 
- 
  $  411 
Includes amounts for Ameren registrants and nonregistrant subsidiaries.  

Missouri 
Regulated 
$   - 
- 
$  - 
- 
$  - 

(a) 

IP  

Merchant 
Generation  Total(a)  
  $  831   
  $   420 
-   
- 
  $ 831   
  $  420 
-   
- 
  $ 831   
  $  420 

Missouri 
Regulated 
$   - 
- 
$  - 
- 
$  - 

Illinois 
Regulated 
$   411 
- 
$  411 
- 
$  411 

Merchant 
Generation 
$   420 
- 
$  420 
- 
$  420 

Total(a)  
$   831   
-   
$  831   
-   
$  831   

2009 

2008 

Gross goodwill at January 1 ........................................  
Accumulated impairment losses ..................................  
Goodwill, net of accumulated impairment losses .........  
Changes during the year .............................................  
Goodwill, net of impairment losses at December 31 ....  

Missouri 
Regulated 
$    - 
- 
$   - 
- 
$   - 

Illinois 
Regulated 
  $   214 
- 
  $  214 
- 
  $  214 

Merchant 
Generation  Total 

$   - 
- 
$   - 
- 
$   - 

  $   214   
-   
  $  214   
-   
  $  214   

Missouri 
Regulated 
$   - 
- 
$   - 
- 
$   - 

Illinois 
Regulated 
$    214 
- 
$  214 
- 
$  214 

Merchant 
Generation 
$   - 
- 
$   - 
- 
$   - 

Total 
$   214   
-   
$  214   
-   
$  214   

174 

  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
 
  
NOTE 18 – SEGMENT INFORMATION  

Ameren has three reportable segments: Missouri 
Regulated, Illinois Regulated, and Merchant Generation. 
The Missouri Regulated segment for Ameren includes all 
the operations of UE’s business as described in Note 1 – 
Summary of Significant Accounting Policies, except for 
UE’s 40% interest in EEI (which in February 2008 was 
transferred to Resources Company through an internal 
reorganization). The Illinois Regulated segment for 
Ameren consists of the regulated electric and gas 
transmission and distribution businesses of CIPS, CILCO, 
and IP, as described in Note 1 – Summary of Significant 
Accounting Policies, and AITC. The Merchant Generation 
segment for Ameren consists primarily of the operations or 
activities of Genco, the CILCORP parent company, 
AERG, EEI, Medina Valley and Marketing Company. The 
category called Other primarily includes Ameren parent 
company activities.  

UE has one reportable segment: Missouri Regulated. 

The Missouri Regulated segment for UE includes all the 
operations of UE’s business as described in Note 1 – 
Summary of Significant Accounting Policies, except for 
UE’s former 40% interest in EEI.  

CILCO has two reportable segments: Illinois 
Regulated and Merchant Generation. The Illinois 
Regulated segment for CILCO consists of the regulated 
electric and gas transmission and distribution businesses 
of CILCO. The Merchant Generation segment for CILCO 
consists of the generation business of AERG. Other 
comprises minor activities not reported in the Illinois 
Regulated or Merchant Generation segments.

The following tables present information about the reported revenues and specified items included in net income of 
Ameren, UE, and CILCO for the years ended December 31, 2009, 2008 and 2007, and total assets as of December 31, 
2009, 2008 and 2007.  

Ameren  

Missouri 
Regulated 

Illinois 
Regulated 

Merchant 
Generation 

Other 

Intersegment 
Eliminations 

Consolidated 

$ 

  $ 

 -  
(463) 
-  
(37) 
(41) 
-  
-  
-  
(2,433) 

$   2,912 
27 
216 
5 
153 
77 
124 
415 
  7,344 

$  2,847 
27 
357 
29 
229 
128 
259 
872 
  12,301 

$    1,322 
390 
126 
- 
119 
151 
247 
408 
4,921 

$  7,090 
- 
725 
30 
508 
332 
612 
1,704 
  23,790 

9  
19  
26  
33  
48  
(24 ) 
(18 ) 
9  
    1,657  

2009 
External revenues ..............................................................  
Intersegment revenues ......................................................  
Depreciation and amortization ............................................  
Interest and dividend income .............................................  
Interest charges .................................................................  
Income taxes (benefit)........................................................  
Net income (loss) attributable to Ameren Corporation(a) ......  
Capital expenditures ..........................................................  
Total assets .......................................................................  
2008 
External revenues ..............................................................  
Intersegment revenues ......................................................  
Depreciation and amortization ............................................  
Interest and dividend income .............................................  
Interest charges .................................................................  
Income taxes (benefit)........................................................  
Net income (loss) attributable to Ameren Corporation(a) ......  
Capital expenditures ..........................................................  
Total assets .......................................................................  
2007 
External revenues ..............................................................  
Intersegment revenues ......................................................  
Depreciation and amortization ............................................  
Interest and dividend income .............................................  
Interest charges .................................................................  
Income taxes (benefit)........................................................  
Net income attributable to Ameren Corporation(a) ...............  
Capital expenditures ..........................................................  
Total assets .......................................................................  
(a)  Represents net income (loss) available to common stockholders; 100% of CILCO’s preferred stock dividends are included in the Illinois Regulated segment.  

2  
18  
28  
30  
44  
(40 ) 
(13 ) 
52  
    1,227  

$  7,562 
- 
681 
55 
423 
330 
618 
1,381 
  20,752 

$  7,839 
- 
685 
43 
440 
327 
605 
1,896 
  22,671 

$  1,315 
497 
105 
2 
107 
182 
281 
395 
3,784 

$  1,482 
455 
109 
3 
99 
217 
352 
611 
4,568 

$  2,915 
46 
333 
34 
194 
143 
281 
625 
  10,852 

$  2,922 
38 
329 
33 
193 
134 
234 
874 
  11,529 

$  3,318 
62 
217 
26 
132 
25 
47 
321 
  6,409 

$  3,433 
45 
219 
15 
144 
16 
32 
359 
  7,088 

 -  
(645) 
-  
(59) 
(39) 
-  
-  
-  
(1,258) 

 -  
(556) 
-  
(38) 
(40) 
-  
-  
-  
(1,741) 

14  
40  
26  
52  
29  
(20 ) 
9  
40  
965  

  $ 

  $ 

$ 

$ 

175 

  
  
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
  
  
  
  
  
  
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
   
 
 
  
Missouri Regulated 

Other (a) 

Consolidated UE 

UE  

2009 
Revenues .....................................................................................................................  
Depreciation and amortization .......................................................................................  
Interest charges ............................................................................................................  
Income taxes ................................................................................................................  
Net income(b) ................................................................................................................  
Capital expenditures .....................................................................................................  
Total assets ..................................................................................................................  
2008 
Revenues .....................................................................................................................  
Depreciation and amortization .......................................................................................  
Interest charges ............................................................................................................  
Income taxes ................................................................................................................  
Net income(b) ................................................................................................................  
Capital expenditures .....................................................................................................  
Total assets ..................................................................................................................  
2007 
Revenues .....................................................................................................................  
Depreciation and amortization .......................................................................................  
Interest charges ............................................................................................................  
Income taxes (benefit)...................................................................................................  
Net income(b) ................................................................................................................  
Capital expenditures .....................................................................................................  
Total assets ..................................................................................................................  

Included 40% interest in EEI through February 29, 2008.  

(a) 
(b)  Represents net income available to the common stockholder (Ameren).  

CILCO  

2009 
External revenues ............................................................  
Intersegment revenues ....................................................  
Depreciation and amortization ..........................................  
Interest charges ...............................................................  
Income taxes ...................................................................  
Net income(a) ...................................................................  
Capital expenditures ........................................................  
Total assets .....................................................................  
2008 
External revenues ............................................................  
Intersegment revenues ....................................................  
Depreciation and amortization ..........................................  
Interest charges ...............................................................  
Income taxes ...................................................................  
Net income(a) ...................................................................  
Capital expenditures ........................................................  
Total assets .....................................................................  
2007 
External revenues ............................................................  
Intersegment revenues ....................................................  
Depreciation and amortization ..........................................  
Interest charges ...............................................................  
Income taxes ...................................................................  
Net income(a) ...................................................................  
Capital expenditures ........................................................  
Total assets .....................................................................  

Illinois 
Regulated 

Merchant 
Generation 

$  655 
1 
32 
25 
8 
20 
63 

  1,264 

$  805 
3 
50 
16 
5 
16 
61 
  1,214 

$  732 
- 
54 
18 
- 
9 
64 
  1,017 

$  427 
- 
38 
16 
64 
114 
91 

  1,119 

$  342 
- 
27 
5 
34 
52 
258 
  1,081 

$  279 
4 
19 
8 
39 
65 
190 
859 

$  2,874 
357 
229 
128 
259 
872 
  12,301 

$  2,960 
329 
193 
134 
234 
874 
  11,529 

$  2,961 
333 
194 
143 
281 
625 
  10,852 

Other 

$    - 
- 
- 
- 
- 
- 
- 

$ 

- 
- 
- 
- 
- 
- 
- 
- 

$ 

- 
- 
- 
  1 
- 
- 
- 
- 

$ 

$ 

$ 

 -  
-  
-  
-  
-  
-  
-  

 -  
-  
-  
-  
11  
-  
-  

 -  
-  
-  
(3 ) 
55  
-  
  51  

$ 

$ 

$ 

2,874 
357 
229 
128 
259 
872 
12,301 

2,960 
329 
193 
134 
245 
874 
11,529 

2,961 
333 
194 
140 
336 
625 
10,903 

Intersegment 
Eliminations 

Consolidated 
CILCO 

$      -  
(1 ) 
-  
-  
-  
-  
-  
(1 ) 

$ 

$ 

-  
(3 ) 
-  
-  
-  
-  
-  
1  

-  
(4 ) 
-  
-  
-  
-  
-  
(9 ) 

$   1,082 
- 
70 
41 
72 
134 
154 

  2,382 

$  1,147 
- 
77 
21 
39 
68 
319 
  2,296 

$  1,011 
- 
73 
27 
39 
74 
254 
  1,867 

(a)  Represents net income available to the common stockholder (CILCORP); 100% of CILCO’s preferred stock dividends are included in the Illinois Regulated 

segment.  

176 

  
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
SELECTED QUARTERLY INFORMATION (Unaudited) (In millions, except per share amounts)  

Quarter Ended(a) 
Ameren 
March 31, 2009 ...........................................................  
March 31, 2008 ...........................................................  
June 30, 2009 .............................................................  
June 30, 2008 .............................................................  
September 30, 2009 ...................................................  
September 30, 2008 ...................................................  
December 31, 2009 ....................................................  
December 31, 2008 ....................................................  

Operating 
Revenues 

Operating 
Income 

Net Income 
Attributable to 
Ameren Corporation 

Earnings per Common 
Share - Basic and 
Diluted 

$   1,916 
  2,081 
  1,684 
  1,790 
  1,815 
  2,060 
  1,675 
  1,908 

$   321 
  321 
  365 
  444 
  485 
  428 
  245 
  169 

$   141 
  138 
  165 
  206 
  227 
  204 
79 
57 

$   0.66 
  0.66 
  0.77 
  0.98 
  1.04 
  0.97 
  0.34 
  0.27 

(a)  The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding 

and changes in the number of weighted-average shares outstanding each period.  

Quarter Ended 
UE 
March 31, 2009 ........................................................... 
March 31, 2008 ........................................................... 
June 30, 2009 ............................................................. 
June 30, 2008 ............................................................. 
September 30, 2009 ................................................... 
September 30, 2008 ................................................... 
December 31, 2009 .................................................... 
December 31, 2008 .................................................... 
CIPS 
March 31, 2009 ........................................................... 
March 31, 2008 ........................................................... 
June 30, 2009 ............................................................. 
June 30, 2008 ............................................................. 
September 30, 2009 ................................................... 
September 30, 2008 ................................................... 
December 31, 2009 .................................................... 
December 31, 2008 .................................................... 
Genco(a)  
March 31, 2009 ........................................................... 
March 31, 2008 ........................................................... 
June 30, 2009 ............................................................. 
June 30, 2008 ............................................................. 
September 30, 2009 ................................................... 
September 30, 2008 ................................................... 
December 31, 2009 .................................................... 
December 31, 2008 .................................................... 
CILCO 
March 31, 2009 ........................................................... 
March 31, 2008 ........................................................... 
June 30, 2009 ............................................................. 
June 30, 2008 ............................................................. 
September 30, 2009 ................................................... 
September 30, 2008 ................................................... 
December 31, 2009 .................................................... 
December 31, 2008 .................................................... 

Operating 
Revenues 

Operating 
Income (Loss) 

Net Income (Loss) 

Net Income (Loss) 
Available to  Common 
Stockholder 

$  22   
64   
84   
  124   
    142  
99   
17   
(36 ) 

$ 

7   
3   
1   
(3 ) 
18   
7   
3   
8   

$  47   
46   
46   
74   
27   
20   
35   
35   

$  33   
26   
31   
12   
37   
24   
34   
7   

$ 

21  
63  
82  
122  
       141  
98  
15  
(38 ) 

$ 

$ 

$ 

6  
2  
1  
(3 ) 
17  
6  
2  
7  

47  
46  
46  
74  
27  
20  
35  
35  

33  
26  
31  
11  
36  
24  
34  
7  

$      655 
724 
752 
771 
836 
875 
631 
590 

$ 

$ 

$ 

265 
290 
196 
207 
208 
217 
200 
268 

225 
233 
218 
196 
212 
238 
195 
241 

311 
345 
232 
232 
251 
264 
288 
306 

$  75   
  111   
  173   
  232   
     257   
  195   
61   
(24 ) 

$  16   
8   
6   
3   
35   
14   
11   
17   

$  90   
83   
84   
  133   
63   
46   
73   
68   

$  59   
48   
59   
22   
69   
43   
65   
19   

177 

  
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Quarter Ended 
IP   
March 31, 2009 ........................................................... 
March 31, 2008 ........................................................... 
June 30, 2009 ............................................................. 
June 30, 2008 ............................................................. 
September 30, 2009 ................................................... 
September 30, 2008 ................................................... 
December 31, 2009 .................................................... 
December 31, 2008 .................................................... 
(a)  Genco had no preferred stock outstanding.  

Operating 
Revenues 

Operating 
Income (Loss) 

Net Income (Loss) 

Net Income (Loss) 
Available to  Common 
Stockholder 

$      472 
503 
325 
360 
329 
353 
378 
480 

$     49   
27   
47   
8   
83   
29   
51   
39   

$  14   
3   
13   
(10 ) 
      35   
5   
17   
7   

$ 

13  
2  
13  
(10 ) 
     34  
4  
17  
7  

ITEM  9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL 

DISCLOSURE.  

None.  

ITEM 9A and ITEM 9A(T).  CONTROLS AND PROCEDURES.  

Each of the Ameren Companies was required to comply with Section 404 of the Sarbanes-Oxley Act of 2002 and 
related SEC regulations as to management’s assessment of internal control over financial reporting for the 2009 fiscal 
year.  

(a)  Evaluation of Disclosure Controls and Procedures  

As of December 31, 2009, evaluations were performed under the supervision and with the participation of 

management, including the principal executive officer and principal financial officer of each of the Ameren Companies, of 
the effectiveness of the design and operation of such registrant’s disclosure controls and procedures (as defined in Rules 
13a-15(e) and 15d-15(e) of the Exchange Act). Based upon those evaluations, the principal executive officer and principal 
financial officer of each of the Ameren Companies concluded that such disclosure controls and procedures are effective to 
provide assurance that information required to be disclosed in such registrant’s reports filed or submitted under the 
Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and 
forms and such information is accumulated and communicated to its management, including its principal executive and 
principal financial officers, to allow timely decisions regarding required disclosure.  
(b)  Management’s Report on Internal Control over Financial Reporting  

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as 
such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Under the supervision and with the participation of 
management, including the principal executive officer and principal financial officer, an evaluation was conducted of the 
effectiveness of each of the Ameren Companies’ internal control over financial reporting based on the framework in 
Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway 
Commission (COSO). After making that evaluation, management concluded that each of the Ameren Companies’ internal 
control over financial reporting was effective as of December 31, 2009. The effectiveness of Ameren’s internal control 
over financial reporting as of December 31, 2009, has been audited by PricewaterhouseCoopers LLP, an independent 
registered public accounting firm, as stated in its report herein under Part II, Item 8. This annual report does not include an 
attestation report of UE’s, Genco’s, CIPS’, CILCO’s, or IP’s (the Subsidiary Registrants) independent registered public 
accounting firm regarding internal control over financial reporting. Management’s report for the Subsidiary Registrants was 
not subject to attestation by the independent registered public accounting firm because temporary rules of the SEC permit 
the company to provide only management’s report in this annual report.  

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. 
Also, projections of any evaluation of effectiveness into future periods are subject to the risk that controls might become 
inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures might 
deteriorate.  

(c)  Change in Internal Control  

There has been no change in the Ameren Companies’ internal control over financial reporting during their most recent 

fiscal quarter that has materially affected, or is reasonably likely to materially affect, their internal control over financial 
reporting.  

ITEM  9B.  OTHER INFORMATION.  

The Ameren Companies have no information reportable under this item that was required to be disclosed in a report 

on SEC Form 8-K during the fourth quarter of 2009 that has not previously been reported on an SEC Form 8-K.  

178 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
ITEM  10.  DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE.  

PART III  

Information required by Items 401, 405, 406 and 
407(c)(3),(d)(4) and (d)(5) of SEC Regulation S-K for 
Ameren will be included in its definitive proxy statement for 
its 2010 annual meeting of shareholders filed pursuant to 
SEC Regulation 14A; it is incorporated herein by reference. 
Information required by these SEC Regulation S-K items for 
UE, CIPS and CILCO will be included in each company’s 
definitive information statement for its 2010 annual meeting 
of shareholders filed pursuant to SEC Regulation 14C; it is 
incorporated herein by reference. Information required by 
these SEC Regulation S-K items for IP is identical to the 
information that will be contained in CIPS’ definitive 
information statement for CIPS’ 2010 annual meeting of 
shareholders filed pursuant to SEC Regulation 14C; it is 
incorporated herein by reference. With respect to Genco 
this information is omitted in reliance on General Instruction 
I(2) of Form 10-K.  

Information concerning executive officers of the 

Ameren Companies required by Item 401 of SEC 
Regulation S-K is reported under a separate caption 
entitled “Executive Officers of the Registrants” in Part I of 
this report.  

UE, CIPS, Genco, CILCO and IP do not have 
separately designated standing audit committees, but 
instead use Ameren’s audit and risk committee to perform 
such committee functions for their boards of directors. 
These companies have no securities listed on the NYSE 
and therefore are not subject to the NYSE listing 
standards. Douglas R. Oberhelman serves as chairman of 
Ameren’s audit and risk committee, and Stephen F. 
Brauer, Susan S. Elliott, Ellen M. Fitzsimmons and 
Stephen R. Wilson serve as members. The board of 

ITEM  11.  EXECUTIVE COMPENSATION.  

directors of Ameren has determined that Douglas R. 
Oberhelman qualifies as an audit committee financial 
expert and that he is “independent” as that term is used in 
SEC Regulation 14A.  

Also, on the same basis as reported above, the 
boards of directors of UE, CIPS, Genco, CILCO and IP 
use the nominating and corporate governance committee 
of Ameren’s board of directors to perform such committee 
functions. This committee is responsible for the 
nomination of directors and corporate governance 
practices. Ameren’s nominating and corporate governance 
committee will consider director nominations from 
shareholders in accordance with its Policy Regarding 
Nominations of Directors, which can be found on 
Ameren’s Web site: www.ameren.com.  

To encourage ethical conduct in its financial 

management and reporting, Ameren has adopted a Code 
of Ethics that applies to the principal executive officer, the 
principal financial officer, the principal accounting officer, 
the controllers, and the treasurer of the Ameren 
Companies. Ameren has also adopted a Code of 
Business Conduct that applies to the directors, officers, 
and employees of the Ameren Companies. It is referred to 
as the Corporate Compliance Policy. The Ameren 
Companies make available free of charge through 
Ameren’s Web site (www.ameren.com) the Code of Ethics 
and Corporate Compliance Policy. Any amendment to, or 
waiver of, the Code of Ethics and Corporate Compliance 
Policy will be posted on Ameren’s Web site within four 
business days following the date of the amendment or 
waiver.  

Information required by Items 402 and 407(e)(4) and (e)(5) of SEC Regulation S-K for Ameren will be included in its 

definitive proxy statement for its 2010 annual meeting of shareholders filed pursuant to SEC Regulation 14A; it is 
incorporated herein by reference. Information required by these SEC Regulation S-K items for UE, CIPS and CILCO will 
be included in each company’s definitive information statement for its 2010 annual meeting of shareholders filed pursuant 
to SEC Regulation 14C; it is incorporated herein by reference. Information required by these SEC Regulation S-K items 
for IP is identical to the information that will be included in CIPS’ definitive information statement for CIPS’ 2010 annual 
meeting of shareholders filed pursuant to SEC Regulation 14C; it is incorporated herein by reference. With respect to 
Genco, this information is omitted in reliance on General Instruction I(2) of Form 10-K.  

179 

  
  
  
ITEM  12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED 

STOCKHOLDER MATTERS.  
Equity Compensation Plan Information  

The following table presents information as of December 31, 2009, with respect to the shares of Ameren’s common 

stock that may be issued under its existing equity compensation plans.  

Plan Category 
Equity compensation plans approved by security  

holders(a) .......................................................................     

Equity compensation plans not approved by security 

holders ..........................................................................    
Total ...................................................................................    

Number of Securities to be 
Issued Upon Exercise of 
Outstanding Options, 
Warrants and Rights 
(a) 

Weighted-Average 
Exercise Price of 
Outstanding Options, 
Warrants and Rights 
(b)  

Number of Securities Remaining 
Available for Future Issuance Under 
Equity Compensation  
Plans (excluding 
securities reflected in column (a)) 
(c) 

1,510,657 

             - 
1,510,657 

$    31.00(b) 

  -    
$  31.00 (b) 

2,482,059 

               - 
2,482,059 

(a)  Consists of the Ameren Corporation Long-term Incentive Plan of 1998, which was approved by shareholders in April 1998 and expired on April 1, 2008, and 
the Ameren Corporation 2006 Omnibus Incentive Compensation Plan, which was approved by shareholders in May 2006 and expires on May 2, 2016. 
Pursuant to grants of performance share units (PSUs) under the Long-term Incentive Plan of 1998 and the 2006 Omnibus Incentive Compensation Plan, 
124,953 of the securities represent PSUs that vested at December 31, 2009 (including accrued and reinvested dividends), and 1,327,354 of the securities 
represent PSUs granted but not vested (including accrued and reinvested dividends). The actual number of shares issued in respect of the PSUs will vary 
from 0% to 200% of the target level based on the achievement of total shareholder return objectives established for such awards.  
calculating the weighted-average exercise price.  
UE, CIPS, Genco, CILCO and IP do not have separate equity compensation plans.  

(b)  PSUs are awarded when earned in shares of Ameren common stock on a one-for-one basis. Accordingly, the PSUs have been excluded for purposes of 

Security Ownership of Certain Beneficial Owners and Management  

The information required by Item 403 of SEC Regulation S-K for Ameren will be included in its definitive proxy 
statement for its 2010 annual meeting of shareholders filed pursuant to SEC Regulation 14A; it is incorporated herein by 
reference. Information required by this SEC Regulation S-K item for UE, CIPS and CILCO will be included in each 
company’s definitive information statement for its 2010 annual meeting of shareholders filed pursuant to SEC Regulation 
14C; it is incorporated herein by reference. With respect to Genco, this information is omitted in reliance on General 
Instruction I(2) of Form 10-K. Information required by SEC Regulation S-K Item 403 for IP is as follows.  

Securities of IP  

All 23 million outstanding shares of IP’s common stock and 662,924 shares, or about 73%, of IP’s preferred stock are 
owned by Ameren. None of IP’s outstanding shares of preferred stock were owned by directors, nominees for director, or 
executive officers of IP as of February 1, 2010. To our knowledge, other than Ameren, there are no beneficial owners of 
5% or more of IP’s outstanding shares of preferred stock as of February 1, 2010, but no independent inquiry has been 
made to determine whether any shareholder is the beneficial owner of shares not registered in the name of such 
shareholder or whether any shareholder is a member of a shareholder group.  

ITEM  13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE.  

Information required by Item 404 and Item 407(a) of SEC Regulation S-K for Ameren will be included in its definitive 

proxy statement for its 2010 annual meeting of shareholders filed pursuant to SEC Regulation 14A; it is incorporated 
herein by reference. Information required by Item 404 of SEC Regulation S-K item for UE, CIPS and CILCO will be 
included in each company’s definitive information statement for its 2010 annual meeting of shareholders filed pursuant to 
SEC Regulation 14C; it is incorporated herein by reference. Information required by Item 404 of SEC Regulation S-K item 
for IP is identical to the information that will be contained in CIPS’ definitive information statement for CIPS’ 2010 annual 
meeting of shareholders filed pursuant to SEC Regulation 14C; it is incorporated herein by reference. With respect to 
Genco, this information is omitted in reliance on General Instruction I(2) of Form 10-K.  

ITEM  14.  PRINCIPAL ACCOUNTANT FEES AND SERVICES.  

Information required by Item 9(e) of SEC Schedule 14A for the Ameren Companies will be included in the definitive 

proxy statement of Ameren and the definitive information statements of UE, CIPS and CILCO for their 2010 annual 
meetings of shareholders filed pursuant to SEC Regulations 14A and 14C, respectively; it is incorporated herein by 
reference.  

180 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
ITEM  15.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.  

PART IV  

(a)(1) Financial Statements 
Ameren 
Report of Independent Registered Public Accounting Firm .............................................................................................................................    
Consolidated Statement of Income - Years Ended December 31, 2009, 2008 and 2007 .................................................................................    
Consolidated Balance Sheet - December 31, 2009 and 2008  ........................................................................................................................    
Consolidated Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 ..........................................................................    
Consolidated Statement of Common Stockholders’ Equity - Years Ended December 31, 2009, 2008 and 2007 ..............................................    
UE 
Report of Independent Registered Public Accounting Firm .............................................................................................................................    
Consolidated Statement of Income - Years Ended December 31, 2009, 2008 and 2007 .................................................................................    
Balance Sheet - December 31, 2009 and 2008 ..............................................................................................................................................    
Consolidated Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 ..........................................................................    
Consolidated Statement of Common Stockholders’ Equity  ............................................................................................................................    
CIPS 
Report of Independent Registered Public Accounting Firm .............................................................................................................................    
Statement of Income - Years Ended December 31, 2009, 2008 and 2007 ......................................................................................................     
Balance Sheet - December 31, 2009 and 2008 ..............................................................................................................................................    
Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 ...............................................................................................    
Statement of Common Stockholders’ Equity  ..................................................................................................................................................    
Genco 
Report of Independent Registered Public Accounting Firm .............................................................................................................................    
Consolidated Statement of Income - Years Ended December 31, 2009, 2008 and 2007 .................................................................................    
Consolidated Balance Sheet - December 31, 2009 and 2008 .........................................................................................................................    
Consolidated Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 ..........................................................................    
Consolidated Statement of Common Stockholder’s Equity - Years Ended December 31, 2009, 2008 and 2007 ..............................................    
CILCO 
Report of Independent Registered Public Accounting Firm .............................................................................................................................    
Consolidated Statement of Income - Years Ended December 31, 2009, 2008 and 2007 .................................................................................    
Consolidated Balance Sheet - December 31, 2009 and 2008 .........................................................................................................................    
Consolidated Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 ..........................................................................    
Consolidated Statement of Common Stockholders’ Equity - Years Ended December 31, 2009, 2008 and 2007 ..............................................    
IP 
Report of Independent Registered Public Accounting Firm .............................................................................................................................    
Consolidated Statement of Income - Years Ended December 31, 2009, 2008 and 2007 .................................................................................    
Balance Sheet -December 31, 2009 and 2008 ...............................................................................................................................................    
Consolidated Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 ..........................................................................    
Consolidated Statement of Common Stockholders’ Equity - Years Ended December 31, 2009, 2008 and 2007 ..............................................    
(a)(2) Financial Statement Schedules 
Schedule I - Condensed Financial Information of Parent - Ameren: 

Condensed Statement of Income - Years Ended December 31, 2009, 2008 and 2007 ........................................................................    
Condensed Balance Sheet - December 31, 2009 and 2008 ................................................................................................................    
Condensed Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 .................................................................    

Schedule I - Condensed Financial Information of Parent - CILCO: 

Condensed Statement of Income - Years Ended December 31, 2009, 2008 and 2007 ........................................................................    
Condensed Balance Sheet - December 31, 2009 and 2008 ................................................................................................................    
Condensed Statement of Cash Flows - Years Ended December 31, 2009, 2008 and 2007 .................................................................    
Schedule II - Valuation and Qualifying Accounts for the years ended December 31, 2009, 2008 and 2007 .....................................................    

Page No.  

78 
81 
82 
83 
84 

79 
85 
86 
87 
88 

79 
89 
90 
91 
92 

79 
93 
94 
95 
96 

80 
97 
98 
99 
100 

80 
101 
102 
103 
104 

182 
182 
182 

183 
183 
183 
184 

Schedule I and II should be read in conjunction with the aforementioned financial statements. Certain schedules have been omitted because they are not 

applicable or because the required data is shown in the aforementioned financial statements.  

(a)(3)  Exhibits. 

Reference is made to the Exhibit Index commencing on page 191. 
Exhibits are listed in the Exhibit Index commencing on page 191. 

(b) 

181 

  
 
 
  
  
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
 
 
 
  
  
 
 
 
  
 
 
 
 
  
 
 
  
 
 
SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 
AMEREN CORPORATION 
CONDENSED STATEMENT OF INCOME 
For the Years Ended December 31, 2009, 2008 and 2007 

(In millions) 
Operating revenue ......................................................................................................................................  
Operating expenses ....................................................................................................................................  
Operating loss ............................................................................................................................................  
Equity in earnings of subsidiaries ................................................................................................................  
Miscellaneous income .................................................................................................................................  
Interest and other charges ..........................................................................................................................  
Income tax expense ....................................................................................................................................  
Net income .................................................................................................................................................  

$ 

2009 
-  
20  
(20 ) 
625  
32  
37  
(12 ) 
$    612  

2008 
$ 

-  
22  
(22 ) 
610  
16  
22  
(23 ) 
$   605  

2007 
-  
$ 
18  
(18 ) 
  614  
30  
25  
(17 ) 
$   618  

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 
AMEREN CORPORATION 
CONDENSED BALANCE SHEET 

December 31, 2009 

December 31, 2008 

(In millions) 
Assets: 

Cash and equivalents ................................................................................................................................  
Accounts and notes receivable  .................................................................................................................  
Total current assets ........................................................................................................................  
Investments in subsidiaries ........................................................................................................................  
Other .........................................................................................................................................................  
Total assets ..........................................................................................................................................................  
Liabilities and Stockholders’ Equity: 

Accounts payable ......................................................................................................................................  
Other current liabilities ...............................................................................................................................  
Total current liabilities .....................................................................................................................  
Long-term debt ..........................................................................................................................................  
Other deferred credits and other noncurrent liabilities .................................................................................  
Stockholders’ equity ...................................................................................................................................  
Total liabilities and stockholders’ equity .................................................................................................................  

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 
AMEREN CORPORATION 
CONDENSED STATEMENT OF CASH FLOWS 
For the Years Ended December 31, 2009, 2008 and 2007 

(In millions) 
Net cash flows from operating activities .............................................................................................  
Cash flows from investing activities: 

Money pool advances, net .....................................................................................................  
Investments in subsidiaries ....................................................................................................  
Net cash flows from investing activities .............................................................................................  
Cash flows from financing activities: 

Dividends on common stock ..................................................................................................  
Short-term and credit facility borrowings, net ..........................................................................  
Redemptions, repurchases, and maturities of long-term debt .................................................  
Issuances of: 

Long-term debt ...........................................................................................................  
Common stock ...........................................................................................................  
Other .....................................................................................................................................  
Net cash flows from financing activities .............................................................................................  
Net change in cash and equivalents ..................................................................................................  
Cash and equivalents at beginning of year ........................................................................................  
Cash and equivalents at the end of year ...........................................................................................  
Cash dividends received from consolidated subsidiaries ...................................................................  
AMEREN CORPORATION (parent company only)  
NOTES TO CONDENSED FINANCIAL STATEMENTS  
December 31, 2009  
NOTE 1 – BASIS OF PRESENTATION  

$ 

24 
1,211 
1,235 
7,882 
229 
$    9,346 

$ 

66 
915 
981 
423 
73 
7,869 
$  9,346 

$ 

22 
804 
826 
  6,764 
133 
$   7,723 

$ 

50 
632 
682 
- 
78 
  6,963 
$  7,723 

2008  
$  338  

2007  
$  682  

2009 
$  ( 442)  

300  
(831)  
( 531)  

(338)  
275  
-  

423  
634  
(19)  
97 5  
2  
22  
24  
      338  

 (129) 
 67  
 (62) 

 (534) 
 25  
 -  

 -  
 154  
 (6) 
 (361) 
 (85) 
 107  
 22  
      534  

131  
(523) 
(392) 

(527) 
500  
(350) 

-  
91  
-  
(286) 
4  
103  
107  
   527  

Ameren Corporation (parent company only) has accounted for wholly owned subsidiaries using the equity method. These financial statements are presented 

on a condensed basis. Additional disclosures relating to the parent company financial statements are included under the combined notes under Part II, Item 8, of 
this report.  

182 

   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
NOTE 2 – LONG-TERM OBLIGATIONS  

See Note 5 – Long-term Debt and Equity Financings under Part II, Item 8, of this report for a description and details of long-term obligations of Ameren 

Corporation (parent company only).  
NOTE 3 – COMMITMENTS AND CONTINGENCIES  

See Note 15 – Commitments and Contingencies under Part II, Item 8, of this report for a description of all material contingencies and guarantees outstanding 

of Ameren Corporation (parent company only).  

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 
CENTRAL ILLINOIS LIGHT COMPANY 
CONDENSED STATEMENT OF INCOME 
For the Years Ended December 31, 2009, 2008 and 2007 

(In millions) 
Operating revenue .....................................................................................................................................  
Operating expenses ...................................................................................................................................  
Operating income ......................................................................................................................................  
Equity in earnings of subsidiaries ...............................................................................................................  
Miscellaneous income (expense) ...............................................................................................................  
Interest and other charges .........................................................................................................................  
Income tax expense ...................................................................................................................................  
Net income ................................................................................................................................................  

2009 
$   656  
598  
58  
114  
(4) 
26  
8  
$  134  

2008 
$   808   
767   
41   
52   
(3 ) 
17   
5   
68   

$ 

2007 
$   732 
  704 
28 
65 
1 
20 
- 
$  74 

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 
CENTRAL ILLINOIS LIGHT COMPANY 
CONDENSED BALANCE SHEET 

December 31, 2009 

December 31, 2008 

(In millions) 
Assets: 

Cash and equivalents .............................................................................................................  
Other current assets ...............................................................................................................  
Total current assets .....................................................................................................  
Investments in subsidiaries .....................................................................................................  
Property and plant, net ............................................................................................................  
Other ......................................................................................................................................  
Total assets .......................................................................................................................................  
Liabilities and Stockholders’ Equity: 

Accounts payable ...................................................................................................................  
Other current liabilities ............................................................................................................  
Total current liabilities ..................................................................................................  
Long-term debt .......................................................................................................................  
Other deferred credits and other noncurrent liabilities ..............................................................  
Stockholders’ equity ................................................................................................................  
Total liabilities and stockholders’ equity ..............................................................................................  

$ 

88 
207 
295 
552 
792 
177 
$  1,816 

$ 

76 
96 
172 
279 
512 
853 
$   1,816 

$ 

- 
248 
248 
438 
754 
209 
$  1,649 

$ 

86 
95 
181 
279 
501 
688 
$   1,649 

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 
CENTRAL ILLINOIS LIGHT COMPANY 
CONDENSED STATEMENT OF CASH FLOWS 
For the Years Ended December 31, 2009, 2008 and 2007 

(In millions) 
Net cash flows from operating activities ...............................................................................................  
Cash flows from investing activities: ....................................................................................................  
Capital expenditures ................................................................................................................  
Net cash flows from investing activities ...............................................................................................  
Cash flows from financing activities: 

Dividends on common stock ....................................................................................................  
Short-term debt, net .................................................................................................................  
Redemptions, repurchases, and maturities of long term debt ...................................................  
Issuances of long-term debt .....................................................................................................  
Capital contribution from parent ...............................................................................................  
Other .......................................................................................................................................  
Net cash flows from financing activities ...............................................................................................  
Net change in cash and equivalents ....................................................................................................  
Cash and equivalents at beginning of year ..........................................................................................  
Cash and equivalents at the end of year .............................................................................................  
Cash dividends received from consolidated subsidiaries .....................................................................  

2009 
$    124   

2008  
$     42  

2007  
$    38  

(63)  
(63)  

(20)  
-   
-   
-   
51   
(4)  
27   
88   
-   
88   
-   

 (61) 
 (61) 

 -  
 (115) 
 (19) 
 150  
 -  
 (1) 
 15  
 (4) 
 4  
 -  
 -  

(64 ) 
(64 ) 

-  
65  
(50 ) 
-  
15  
-  
30  
4  
-  
4  
10  

183 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
CENTRAL ILLINOIS LIGHT COMPANY (parent company only)  
NOTES TO CONDENSED FINANCIAL STATEMENTS  
December 31, 2009  
NOTE 1 – BASIS OF PRESENTATION  

Central Illinois Light Company (parent company only) has accounted for wholly owned subsidiaries using the equity method. These financial statements are 
presented on a condensed basis. Additional disclosures relating to the parent company financial statements are included under the combined notes under Part II, 
Item 8, of this report.  
NOTE 2 – LONG-TERM OBLIGATIONS  

See Note 5 – Long-term Debt and Equity Financings under Part II, Item 8, of this report for a description and details of long-term obligations of Central Illinois 

Light Company (parent company only).  
NOTE 3 – COMMITMENTS AND CONTINGENCIES  

See Note 15 – Commitments and Contingencies under Part II, Item 8, of this report for a description of all material contingencies and guarantees outstanding 

of Central Illinois Light Company (parent company only).  

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS 
FOR THE YEARS ENDED DECEMBER 31, 2009, 2008 AND 2007 

(In millions) 

Column A 

Description 

Ameren: 
Deducted from assets - allowance for doubtful accounts: 

2009 ...................................................................................  
2008 ...................................................................................  
2007 ...................................................................................  

UE: 
Deducted from assets - allowance for doubtful accounts: 

2009 ...................................................................................  
2008 ...................................................................................  
2007 ...................................................................................  

CIPS: 
Deducted from assets - allowance for doubtful accounts: 

2009 ...................................................................................  
2008 ...................................................................................  
2007 ...................................................................................  

CILCO: 
Deducted from assets - allowance for doubtful accounts: 

2009 ...................................................................................  
2008 ...................................................................................  
2007 ...................................................................................  

IP: 
Deducted from assets - allowance for doubtful accounts: 

2009 ...................................................................................  
2008 ...................................................................................  
2007 ...................................................................................  

Column B  
Balance at 
Beginning 
of Period 

Column C  

Column D  

Column E  

(1) 
Charged to Costs 
and Expenses 

(2) 
Charged to Other 
Accounts 

Deductions(a)  

Balance at End 
of Period 

$   28 
  22 
  11 

$  8 
6 
6 

$  6 
5 
2 

$  3 
2 
1 

$  12 
9 
3 

$    37 
63 
53 

$ 

$ 

$ 

8 
14 
14 

7 
13 
10 

6 
9 
7 

$  14 
27 
21 

$    - 
- 
- 

$ 

$ 

$ 

$ 

- 
- 
- 

- 
- 
- 

- 
- 
- 

- 
- 
- 

$    41 
57 
42 

$  10 
12 
14 

$ 

$ 

8 
12 
7 

6 
8 
6 

$  17 
24 
15 

$   24 
  28 
  22 

$  6 
8 
6 

$  5 
6 
5 

$  3 
3 
2 

$  9 
  12 
9 

(a)  Uncollectible accounts charged off, less recoveries.  

184 

  
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, each registrant has duly 

caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signatures for each 
undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.  

SIGNATURES  

Date: February 26, 2010 

AMEREN CORPORATION (registrant) 

By  /s/ Thomas R. Voss 
Thomas R. Voss 

   President and Chief Executive Officer 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the 

following persons on behalf of the registrant and in the capacities and on the date indicated.  
/s/ Thomas R. Voss 
Thomas R. Voss 

President, Chief Executive Officer 
and Director 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 

Senior Vice President and 
Chief Financial Officer 
(Principal Financial and Accounting Officer) 

Stephen F. Brauer 

Susan S. Elliott 

Ellen M. Fitzsimmons 

Walter J. Galvin 

Gayle P.W. Jackson 

James C. Johnson 

* 

* 

* 

* 

* 

* 

* 

Charles W. Mueller 

* 
Douglas R. Oberhelman 

Gary L. Rainwater 

Harvey Saligman 

Patrick T. Stokes 

Stephen R. Wilson 

Jack D. Woodard 

* 

* 

* 

* 

* 

*By /s/ Martin J. Lyons, Jr.                                        

Martin J. Lyons, Jr. 
Attorney-in-Fact 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

Director 

185 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

  
 
 
 
  
 
 
 
  
  
  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
  
Date: February 26, 2010 

UNION ELECTRIC COMPANY (registrant) 

By /s/ Warner L. Baxter 
Warner L. Baxter 

   Chairman, President and Chief Executive Officer 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the 

following persons on behalf of the registrant and in the capacities and on the date indicated.  

/s/ Warner L. Baxter 
Warner L. Baxter 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 

Daniel F. Cole 

Adam C. Heflin 

Richard J. Mark 

Steven R. Sullivan 

* 

* 

* 

* 

*By /s/ Martin J. Lyons, Jr.                                   

Martin J. Lyons, Jr. 
Attorney-in-Fact 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

Chairman, President, 
Chief Executive Officer and Director 
(Principal Executive Officer) 

Senior Vice President, 
Chief Financial Officer and Director 
(Principal Financial and Accounting Officer) 

Director 

Director 

Director 

Director 

186 

  
 
 
 
  
 
 
 
  
  
  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
  
Date: February 26, 2010 

CENTRAL ILLINOIS PUBLIC SERVICE COMPANY (registrant) 

By  /s/ Scott A. Cisel 
Scott A. Cisel 

   Chairman, President and Chief Executive Officer 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the 

following persons on behalf of the registrant and in the capacities and on the date indicated.  

/s/ Scott A. Cisel 
Scott A. Cisel 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 

Daniel F. Cole 

Steven R. Sullivan 

* 

* 

*By /s/ Martin J. Lyons, Jr.                                        

Martin J. Lyons, Jr. 
Attorney-in-Fact 

Chairman, President, 
Chief Executive Officer and Director 
(Principal Executive Officer) 

February 26, 2010 

Senior Vice President, 
Chief Financial Officer and Director 
(Principal Financial and Accounting Officer) 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

Director 

Director 

187 

     
 
 
 
  
  
  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
  
AMEREN ENERGY GENERATING COMPANY (registrant) 

Date: February 26, 2010 

By  /s/ Charles D. Naslund 
Charles D. Naslund 
   Chairman and President 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the 

following persons on behalf of the registrant and in the capacities and on the date indicated.  

/s/ Charles D. Naslund 
Charles D. Naslund 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 

Daniel F. Cole 

Steven R. Sullivan 

* 

* 

*By /s/ Martin J. Lyons, Jr.                                       

Martin J. Lyons, Jr. 
Attorney-in-Fact 

Chairman, President and Director 
(Principal Executive Officer) 

February 26, 2010 

Senior Vice President, 
Chief Financial Officer and Director 
(Principal Financial and Accounting Officer) 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

Director 

Director 

188 

  
 
 
 
  
 
 
 
  
  
  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
Date: February 26, 2010 

CENTRAL ILLINOIS LIGHT COMPANY (registrant) 

By  /s/ Scott A. Cisel 
Scott A. Cisel 

   Chairman, President and Chief Executive Officer 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the 

following persons on behalf of the registrant and in the capacities and on the date indicated.  

/s/ Scott A. Cisel 
Scott A. Cisel 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 

Daniel F. Cole 

Steven R. Sullivan 

* 

* 

*By /s/ Martin J. Lyons, Jr.                                        

Martin J. Lyons, Jr. 
Attorney-in-Fact 

Chairman, President, 
Chief Executive Officer and Director 
(Principal Executive Officer) 

February 26, 2010 

Senior Vice President, 
Chief Financial Officer and Director 
(Principal Financial and Accounting Officer) 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

Director 

Director 

189 

  
 
 
 
  
 
 
 
  
  
  
  
 
 
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
  
Date: February 26, 2010 

ILLINOIS POWER COMPANY (registrant) 

By  /s/ Scott A. Cisel 
Scott A. Cisel 

   Chairman, President and Chief Executive Officer 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the 

following persons on behalf of the registrant and in the capacities and on the date indicated.  

/s/ Scott A. Cisel 
Scott A. Cisel 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 

Daniel F. Cole 

Steven R. Sullivan 

* 

* 

*By /s/ Martin J. Lyons, Jr.                                        

Martin J. Lyons, Jr. 
Attorney-in-Fact 

Chairman, President, 
Chief Executive Officer and Director 
(Principal Executive Officer) 

February 26, 2010 

Senior Vice President, 
Chief Financial Officer and Director 
(Principal Financial and Accounting Officer) 

February 26, 2010 

February 26, 2010 

February 26, 2010 

February 26, 2010 

Director 

Director 

190 

  
 
 
 
  
 
 
 
  
  
  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
  
The documents listed below are being filed or have previously been filed on behalf of the Ameren Companies and are incorporated herein by reference from 

the documents indicated and made a part hereof. Exhibits not identified as previously filed are filed herewith:  

EXHIBIT INDEX  

Nature of Exhibit 

Previously Filed as Exhibit to: 

File No. 33-64165, Annex F 
1998 Form 10-K, Exhibit 3(i), File No. 1-
14756 
1993 Form 10-K, Exhibit 3(i), File No. 1-2967 
March 31, 1994 Form 10-Q, Exhibit 3(b), File 
No. 1-3672 
Exhibit 3.1, Form S-4, File No. 333-56594 
Exhibit 3.2, Form S-4, File No. 333-56594 

1998 Form 10-K, Exhibit 3, File No. 1-2732 

September 7, 1994 Form 8-K, Exhibit 3(a), 
File No. 1-3004 
Exhibit 4.1(ii), File No. 333-84008 

October 14, 2008 Form 8-K, Exhibit 3.1(ii), 
File No. 1-14756 
July 29, 2008 Form 8-K, Exhibit 3.1(ii), File 
No. 1-2967 
July 29, 2008 Form 8-K, Exhibit 3.2(ii), File 
No. 1-3672 
September 30, 2004 Form 10-Q, Exhibit 3.1, 
File No. 333-56594 
July 29, 2008 Form 8-K, Exhibit 3.3(ii), File 
No. 1-2732 
July 29, 2008 Form 8-K, Exhibit 3.4(ii), File 
No. 1-3004 

Exhibit 4.5, File No. 333-81774 

June 30, 2008 Form 10-Q, Exhibit 4.1, File 
No. 1-14756 
May 15, 2009 Form 8-K, Exhibits 4.3 and 4.4, 
File No. 1-14756 

Exhibit B-1, File No. 2-4940 

Exhibit Designation 

Articles of Incorporation/ By-Laws 
Ameren 
Ameren 

3.1(i) 
3.2(i) 

Registrant(s)  

3.3(i) 
3.4(i) 

3.5(i) 
3.6(i) 

3.7(i) 

3.8(i) 

3.9(i) 

3.10(ii) 

3.11(ii) 
3.12(ii) 

3.13(ii) 

3.14(ii) 

3.15(ii) 

UE 
CIPS 

Genco 
Genco 

CILCO 

IP 

IP 

Ameren 

UE 
CIPS 

Genco 

CILCO 

IP 

4.2 

4.3 

4.4 

Ameren 

Ameren 

Ameren 
UE 

Instruments Defining Rights of Security Holders, Including Indentures 

4.1 

Ameren 

Restated Articles of Incorporation of Ameren 
Certificate of Amendment to Ameren’s Restated 
Articles of Incorporation filed December 14, 1997 
Restated Articles of Incorporation of UE 
Restated Articles of Incorporation of CIPS 

Articles of Incorporation of Genco 
Amendment to Articles of Incorporation of Genco 
filed April 19, 2000 
Articles of Incorporation of CILCO as amended 
May 29, 1998 
Amended and Restated Articles of Incorporation of 
IP, dated September 7, 1994 
Articles of Amendment to IP’s Amended and 
Restated Articles of Incorporation filed March 28, 
2002 
By-Laws of Ameren as amended effective October 
10, 2008 
By-Laws of UE as amended July 28, 2008 
By-Laws of CIPS as amended July 28, 2008 

By-Laws of Genco as amended to October 8, 
2004 
By-Laws of CILCO as amended effective July 28, 
2008 
By-Laws of IP as amended July 28, 2008 

Indenture of Ameren with The Bank of New York 
Mellon Trust Company, N.A., as successor 
trustee, relating to senior debt securities dated as 
of December 1, 2001 (Ameren’s Senior Indenture) 
First Supplemental Indenture to Ameren’s Senior 
Indenture dated as of May 19, 2008 
Ameren Company Order dated May 15, 2009, 
establishing 8.875% Senior Notes, due 2014 
(including the global note) 
Indenture of Mortgage and Deed of Trust dated 
June 15, 1937 (UE Mortgage), from UE to The 
Bank of New York Mellon, as successor trustee, 
as amended May 1, 1941, and Second 
Supplemental Indenture dated May 1, 1941 

191 

  
 
 
 
 
Exhibit Designation 
4.5 

4.6 

4.7 

4.8 

4.9 

4.10 

4.11 

4.12 

4.13 

4.14 

4.15 

4.16 

4.17 

4.18 

4.19 

4.20 

4.21 

4.22 

4.23 

4.24 

4.25 

4.26 

Registrant(s)  

Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 

Nature of Exhibit 
Supplemental Indenture to the UE Mortgage dated 
as of April 1, 1971 
Supplemental Indenture to the UE Mortgage dated 
as of February 1, 1974 
Supplemental Indenture to the UE Mortgage dated 
as of July 7, 1980 
Supplemental Indenture to the UE Mortgage dated 
as of May 1, 1993 
Supplemental Indenture to the UE Mortgage dated 
as of October 1, 1993 
Supplemental Indenture to the UE Mortgage dated 
as of February 1, 2000 
Supplemental Indenture to the UE Mortgage dated 
August 15, 2002 
Supplemental Indenture to the UE Mortgage dated 
March 5, 2003 
Supplemental Indenture to the UE Mortgage dated 
April 1, 2003 
Supplemental Indenture to the UE Mortgage dated 
July 15, 2003 
Supplemental Indenture to the UE Mortgage dated 
October 1, 2003 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004A 
(1998A) Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004B 
(1998B) Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004C 
(1998C) Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004D 
(2000B) Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004E 
(2000A) Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004F 
(2000C) Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004G (1991) 
Bonds 
Supplemental Indenture to the UE Mortgage dated 
February 1, 2004, relative to Series 2004H (1992) 
Bonds 
Supplemental Indenture to the UE Mortgage dated 
May 1, 2004 
Supplemental Indenture to the UE Mortgage dated 
September 1, 2004 
Supplemental Indenture to the UE Mortgage dated 
January 1, 2005 

Previously Filed as Exhibit to: 
April 1971 Form 8-K, Exhibit 6, File No. 1-
2967 
February 1974 Form 8-K, Exhibit 3, File 
No. 1-2967 
Exhibit 4.6, File No. 2-69821 

1993 Form 10-K, Exhibit 4.6, File No. 1-2967 

1993 Form 10-K, Exhibit 4.8, File No. 1-2967 

2000 Form 10-K, Exhibit 4.1, File No. 1-2967 

August 23, 2002 Form 8-K, Exhibit 4.3, File 
No. 1-2967 
March 11, 2003 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
April 10, 2003 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
August 4, 2003 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
October 8, 2003 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
March 31, 2004 Form 10-Q, Exhibit 4.1, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.2, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.3, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.4, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.5, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.6, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.7, File 
No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.8, File 
No. 1-2967 

May 18, 2004 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
September 23, 2004 Form 8-K, Exhibit 4.4, 
File No. 1-2967 
January 27, 2005 Form 8-K, Exhibit 4.4, File 
No. 1-2967 

192 

 
Exhibit Designation 
4.27 
4.28 

4.29 

4.30 

4.31 

4.32 

4.33 

4.34 

4.35 

4.36 

4.37 

4.38 

4.39 

4.40 

4.41 

4.42 

4.43 

Registrant(s)  

Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 

Ameren 
UE 

Ameren 
UE 
Ameren 
UE 

Ameren 
UE 
Ameren 
UE 

Ameren 
UE 
Ameren 
UE 

Ameren 
UE 
Ameren 
UE 
Ameren 
UE 

Nature of Exhibit 
Supplemental Indenture to the UE Mortgage dated 
July 1, 2005 
Supplemental Indenture to the UE Mortgage dated 
December 1, 2005 
Supplemental Indenture to the UE Mortgage dated 
June 1, 2007 
Supplemental Indenture to the UE Mortgage dated 
April 1, 2008 
Supplemental Indenture to the UE Mortgage dated 
June 1, 2008 
Supplemental Indenture to the UE Mortgage dated 
March 1, 2009 
Loan Agreement dated as of December 1, 1992, 
between the Missouri Environmental Authority and 
UE, together with Indenture of Trust dated as of 
December 1, 1992, between the Missouri 
Environmental Authority and UMB Bank, N.A. as 
successor trustee to Mercantile Bank of St. Louis, 
N.A. 
First Amendment dated as of February 1, 2004, to 
Loan Agreement dated as of December 1, 1992, 
between the Missouri Environmental Authority and 
UE 
Series 1998A Loan Agreement dated as of 
September 1, 1998, between the Missouri 
Environmental Authority and UE  
First Amendment dated as of February 1, 2004, to 
Series 1998A Loan Agreement dated as of 
September 1, 1998, between the Missouri 
Environmental Authority and UE 
Series 1998B Loan Agreement dated as of 
September 1, 1998, between the Missouri 
Environmental Authority and UE  
First Amendment dated as of February 1, 2004, to 
Series 1998B Loan Agreement dated as of 
September 1, 1998, between the Missouri 
Environmental Authority and UE 
Series 1998C Loan Agreement dated as of 
September 1, 1998, between the Missouri 
Environmental Authority and UE  
First Amendment dated as of February 1, 2004, to 
Series 1998C Loan Agreement dated as of 
September 1, 1998, between the Missouri 
Environmental Authority and UE 
Indenture dated as of August 15, 2002, from UE to 
The Bank of New York Mellon, as successor 
trustee (relating to senior secured debt securities) 
UE Company Order dated August 22, 2002, 
establishing the 5.25% Senior Secured Notes due 
2012 (including the global note) 
UE Company Order dated March 10, 2003, 
establishing the 5.50% Senior Secured Notes due 
2034 (including the global note)  

Previously Filed as Exhibit to: 
July 21, 2005 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
December 9, 2005 Form 8-K, Exhibit 4.4, File 
No. 1-2967 
June 15, 2007 Form 8-K, Exhibit 4.5, File 
No. 1-2967 
April 8, 2008 Form 8-K, Exhibit 4.7, File 
No. 1-2967 
June 19, 2008 Form 8-K, Exhibit 4.5, File 
No. 1-2967 
March 23, 2009 Form 8-K, Exhibit 4.5, File 
No. 1-2967 
1992 Form 10-K, Exhibit 4.38, File No. 1-
2967 

March 31, 2004 Form 10-Q, Exhibit 4.10, File 
No. 1-2967 

September 30, 1998 Form 10-Q, Exhibit 
4.28, File No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.11, File 
No. 1-2967 

September 30, 1998 Form 10-Q, Exhibit 
4.29, File No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.12, File 
No. 1-2967 

September 30, 1998 Form 10-Q, Exhibit 
4.30, File No. 1-2967 

March 31, 2004 Form 10-Q, Exhibit 4.13, File 
No. 1-2967 

August 23, 2002 Form 8-K, Exhibit 4.1, File 
No. 1-2967 

August 23, 2002 Form 8-K, Exhibit 4.2, File 
No. 1-2967 

March 11, 2003 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

193 

 
Exhibit Designation 
4.44 

4.45 

4.46 

4.47 

4.48 

4.49 

4.50 

4.51 

4.52 

4.53 

4.54 

4.55 

4.56 

4.57 

4.58 

4.59 

4.60 

4.61 

4.62 

4.63 

Registrant(s)  

Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
UE 
Ameren 
CIPS 

Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 

Nature of Exhibit 

UE Company Order dated April 9, 2003, 
establishing the 4.75% Senior Secured Notes due 
2015 (including the global note)  
UE Company Order dated July 28, 2003, 
establishing the 5.10% Senior Secured Notes due 
2018 (including the global note)  
UE Company Order dated October 7, 2003, 
establishing the 4.65% Senior Secured Notes due 
2013 (including the global note) 
UE Company Order dated May 13, 2004, 
establishing the 5.50% Senior Secured Notes due 
2014 (including the global note)  
UE Company Order dated September 1, 2004, 
establishing the 5.10% Senior Secured Notes due 
2019 (including the global note) 
UE Company Order dated January 27, 2005, 
establishing the 5.00% Senior Secured Notes due 
2020 (including the global note) 
UE Company Order dated July 21, 2005, 
establishing the 5.30% Senior Secured Notes due 
2037 (including the global note)  
UE Company Order dated December 8, 2005, 
establishing the 5.40% Senior Secured Notes due 
2016 (including the global note) 
UE Company Order dated June 15, 2007, 
establishing the 6.40% Senior Secured Notes due 
2017 (including the global note)  
UE Company Order dated April 8, 2008, 
establishing the 6.00% Senior Secured Notes due 
2018 (including the global note)  
UE Company Order dated June 19, 2008, 
establishing the 6.70% Senior Secured Notes due 
2019 (including the global note)  
UE Company Order dated March 20, 2009, 
establishing 8.45% Senior Secured Notes due 
2039 (including the global note)  
Indenture of Mortgage or Deed of Trust dated 
October 1, 1941, from CIPS to U.S. Bank National 
Association and Richard Prokosch, as successor 
trustees (CIPS Mortgage) 
Supplemental Indenture to the CIPS Mortgage, 
dated September 1, 1947 
Supplemental Indenture to the CIPS Mortgage, 
dated January 1, 1949 
Supplemental Indenture to the CIPS Mortgage, 
dated June 1, 1965 
Supplemental Indenture to the CIPS Mortgage, 
dated April 1, 1971 
Supplemental Indenture to the CIPS Mortgage, 
dated December 1, 1973 
Supplemental Indenture to the CIPS Mortgage, 
dated February 1, 1980 
Supplemental Indenture to the CIPS Mortgage, 
dated May 15, 1992 

Previously Filed as Exhibit to: 
April 10, 2003 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

August 4, 2003 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

October 8, 2003 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

May 18, 2004 Form 8-K, Exhibits 4.2 and 4.3, 
No. 1-2967 

September 23, 2004 Form 8-K, Exhibits 4.2 
and 4.3, No. 1-2967 

January 27, 2005 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

July 21, 2005 Form 8-K, Exhibits 4.2 and 4.3, 
File No. 1-2967 

December 9, 2005 Form 8-K, Exhibits 4.2 
and 4.3, File No. 1-2967 

June 15, 2007 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

April 8, 2008 Form 8-K, Exhibits 4.3 and 4.5, 
File No. 1-2967 

June 19, 2008 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

March 23, 2009 Form 8-K, Exhibits 4.2 and 
4.3, File No. 1-2967 

Exhibit 2.01, File No. 2-60232 

Amended Exhibit 7(b), File No. 2-7341 

Second Amended Exhibit 7.03, File No. 2-
7795 
Amended Exhibit 2.02, File No. 2-23569 

Amended Exhibit 2.02, File No. 2-39587 

Exhibit 2.03, File No. 2-60232 

Exhibit 2.02(a), File No. 2-66380 

May 15, 1992 Form 8-K, Exhibit 4.02, File 
No. 1-3672 

194 

 
Exhibit Designation 
4.64 

4.65 

4.66 

4.67 

4.68 

4.69 

4.70 

4.71 

4.72 

4.73 

4.74 

4.75 

4.76 

4.77 

4.78 

4.79 

4.80 

4.81 

Registrant(s)  

Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 

Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
CIPS 
Ameren 
Genco 

Ameren 
Genco 
Ameren 
Genco 
Ameren 
Genco 
Ameren 
Genco 
Ameren 
Genco 
Ameren 
Genco 

Nature of Exhibit 

Supplemental Indenture to the CIPS Mortgage, 
dated June 1, 1997 
Supplemental Indenture to the CIPS Mortgage, 
dated December 1, 1998 
Supplemental Indenture to the CIPS Mortgage, 
dated June 1, 2001 
Supplemental Indenture to the CIPS Mortgage, 
dated October 1, 2004 
Supplemental Indenture to the CIPS Mortgage, 
dated June 1, 2006 
Supplemental Indenture to the CIPS Mortgage, 
dated June 15, 2009 
Indenture dated as of December 1, 1998, from 
CIPS to The Bank of New York Mellon Trust 
Company, N.A., as successor trustee (CIPS 
Indenture) 
CIPS Global Note, dated December 22, 1998, 
representing Senior Secured Notes, 5.375% due 
2008 
CIPS Global Note, dated December 22, 1998, 
representing Senior Secured Notes, 6.125% due 
2028 
First Supplemental Indenture to the CIPS 
Indenture, dated as of June 14, 2006 
CIPS Company Order, dated June 14, 2006, 
establishing 6.70% Series Secured Notes due 
2036 
Indenture dated as of November 1, 2000, from 
Genco to The Bank of New York Mellon Trust 
Company, N.A., as successor trustee (Genco 
Indenture) 
First Supplemental Indenture dated as of 
November 1, 2000, to Genco Indenture, relating to 
Genco’s 8.35% Senior Notes, Series B due 2010 
Second Supplemental Indenture dated as of June 
12, 2001, to Genco Indenture, relating to Genco’s 
8.35% Senior Note, Series D due 2010 
Third Supplemental Indenture dated as of June 1, 
2002, to Genco Indenture, relating to Genco’s 
7.95% Senior Notes, Series E due 2032 
Fourth Supplemental Indenture dated as of 
January 15, 2003, to Genco Indenture, relating to 
Genco 7.95% Senior Notes, Series F due 2032 
Fifth Supplemental Indenture dated as of April 1, 
2008, to Genco Indenture, relating to Genco 
7.00% Senior Notes, Series G due 2018 
Sixth Supplemental Indenture, dated as of July 7, 
2008, to Genco Indenture, relating to Genco 
7.00% Senior Notes, Series H due 2018 

Previously Filed as Exhibit to: 
June 6, 1997 Form 8-K, Exhibit 4.03, File 
No. 1-3672 
Exhibit 4.2, File No. 333-59438 

June 30, 2001 Form 10-Q, Exhibit 4.1, File 
No. 1-3672 
2004 Form 10-K, Exhibit 4.91, File No. 1-
3672 
June 19, 2006 Form 8-K, Exhibit 4.9, File 
No. 1-3672 
June 30, 2009 Form 10-Q, Exhibit 4.1, File 
No. 1-3672 
Exhibit 4.4, File No. 333-59438 

Exhibit 4.5, File No. 333-59438 

Exhibit 4.6, File No. 333-59438 

June 19, 2006 Form 8-K, Exhibit 4.2, File 
No. 1-3672 
June 19, 2006 Form 8-K, Exhibit 4.5, File 
No. 1-3672 

Exhibit 4.1, File No. 333-56594 

Exhibit 4.2, File No. 333-56594 

Exhibit 4.3, File No. 333-56594 

June 30, 2002 Form 10-Q, Exhibit 4.1, File 
No. 333-56594 

2002 Form 10-K, Exhibit 4.5, File No. 333-
56594 

April 9, 2008 Form 8-K, Exhibit 4.2, File 
No. 333-56594 

Exhibit No. 4.55, File No. 333-155416 

195 

 
Exhibit Designation 
4.82 

4.83 

Registrant(s)  

Ameren 
Genco 
Ameren 
CILCO 

4.84 

4.85 

4.86 

4.87 

4.88 

4.89 

4.90 

4.91 

4.92 

4.93 

4.94 

4.95 

4.96 

Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 

Ameren 
CILCO 
Ameren 
IP 

Ameren 
IP 

Nature of Exhibit 

Seventh Supplemental Indenture, dated as of 
November 1, 2009, to Genco Indenture, relating to 
Genco 6.30% Senior Notes, Series l due 2020 
Indenture of Mortgage and Deed of Trust between 
Illinois Power Company (predecessor in interest to 
CILCO) and Deutsche Bank Trust Company 
Americas (formerly known as Bankers Trust 
Company), as trustee, dated as of April 1, 1933 
(CILCO Mortgage), Supplemental Indenture 
between the same parties dated as of June 30, 
1933, Supplemental Indenture between CILCO 
and the trustee, dated as of July 1, 1933, 
Supplemental Indenture between the same parties 
dated as of January 1, 1935, and Supplemental 
Indenture between the same parties dated as of 
April 1, 1940 
Supplemental Indenture to the CILCO Mortgage, 
dated December 1, 1949 
Supplemental Indenture to the CILCO Mortgage, 
dated July 1, 1957 
Supplemental Indenture to the CILCO Mortgage, 
dated February 1, 1966 
Supplemental Indenture to the CILCO Mortgage, 
dated January 15, 1992 
Supplemental Indenture to the CILCO Mortgage, 
dated October 1, 2004 
Supplemental Indenture to the CILCO Mortgage, 
dated June 1, 2006 
Supplemental Indenture to the CILCO Mortgage, 
dated December 1, 2008 
Supplemental Indenture to the CILCO Mortgage, 
dated June 15, 2009 
Indenture dated as of June 1, 2006, from CILCO 
to The Bank of New York Mellon Trust Company, 
N.A., as successor trustee  
CILCO Company Order, dated June 14, 2006, 
establishing the 6.20% Senior Secured Notes due 
2016 (including the global note) and the 6.70% 
Senior Secured Notes due 2036 (including the 
global note) 
CILCO Company Order, dated December 9, 2008, 
establishing the 8.875% Senior Secured Notes 
due 2013 (including the global note) 
General Mortgage Indenture and Deed of Trust 
dated as of November 1, 1992 between IP and 
The Bank of New York Mellon Trust Company, 
N.A., as successor trustee (IP Mortgage) 
Supplemental Indenture dated as of April 1, 1997, 
to IP Mortgage for the series P, Q and R bonds 

Previously Filed as Exhibit to: 
November 17, 2009 Form 8-K, Exhibit 4.8, 
File No. 333-56594 

Exhibit B-1, Registration No. 2-1937; Exhibit 
B-1(a), Registration No. 2-2093; and 
Exhibit A, April 1940 Form 8-K, File No. 1-
2732 

December 1949 Form 8-K, Exhibit A, File 
No. 1-2732 
July 1957 Form 8-K, Exhibit A, File No. 1-
2732 
February 1966 Form 8-K, Exhibit A, File 
No. 1-2732 
January 30, 1992 Form 8-K, Exhibit 4(b), File 
No. 1-2732 
2004 Form 10-K, Exhibit 4.121, File No. 1-
2732 
June 19, 2006 Form 8-K, Exhibit 4.11, File 
No. 1-2732 
December 9, 2008 Form 8-K, Exhibit 4.5, File 
No. 1-2732 
June 30, 2009 Form 10-Q, Exhibit 4.2, File 
No. 1-2732 
June 19, 2006 Form 8-K, Exhibit 4.3, File 
No. 1-2732 

June 19, 2006 Form 8-K, Exhibit 4.6, File 
No. 1-2732 

December 9, 2008 Form 8-K, Exhibits 4.2 
and 4.3, File No. 1-2732 

1992 Form 10-K, Exhibit 4(cc), File No. 1-
3004 

March 31, 1997 Form 10-Q, Exhibit 4(b), File 
No. 1-3004 

196 

 
Exhibit Designation 
4.97 

4.98 

4.99 

4.100 

4.101 

4.102 

4.103 

4.104 

4.105 

4.106 

4.107 

4.108 

4.109 

4.110 

4.111 

4.112 

4.113 

4.114 

Material Contracts  
10.1 

Registrant(s)  

Ameren 
IP  
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
IP 
Ameren 
CIPS 
Genco 

Nature of Exhibit 

Supplemental Indenture dated as of March 1, 
1998, to IP Mortgage for the series S bonds 
Supplemental Indenture dated as of March 1, 
1998, to IP Mortgage for the series T bonds 
Supplemental Indenture dated as of June 15, 
1999, to IP Mortgage for the 7.50% bonds due 
2009 
Supplemental Indenture dated as of July 15, 1999, 
to IP Mortgage for the series U bonds 
Supplemental Indenture dated as of May 1, 2001 
to IP Mortgage for the series W bonds 
Supplemental Indenture dated as of May 1, 2001, 
to IP Mortgage for the series X bonds 
Supplemental Indenture dated as of December 15, 
2002, to IP Mortgage for the 11.50% bonds due 
2010 
Supplemental Indenture dated as of June 1, 2006, 
to IP Mortgage for the series AA bonds 
Supplemental Indenture dated as of November 15, 
2007, to IP Mortgage for the series BB bonds 
Supplemental Indenture dated as of April 1, 2008, 
to IP Mortgage for the series CC bonds 
Supplemental Indenture dated as of October 1, 
2008, to IP Mortgage for the series DD bonds 
Supplemental Indenture dated as of June 15, 
2009, to IP Mortgage for the 2009 Credit 
Agreement series bonds 
Indenture, dated as of June 1, 2006 from IP to The 
Bank of New York Mellon Trust Company, N.A., as 
successor trustee 
IP Company Order, dated June 14, 2006, 
establishing the 6.25% Senior Secured Notes due 
2016 (including the global note)  
IP Company Order, dated November 15, 2007, 
establishing the 6.125% Senior Secured Notes 
due 2017 (including the global note) 
IP Company Order, dated April 8, 2008, 
establishing the 6.25% Senior Secured Notes due 
2018 (including the global note)  
IP Company Order dated October 23, 2008, 
establishing the 9.75% Senior Secured Notes due 
2018 (including the global note)  
Amended and Restated Genco Subordinated 
Promissory Note dated as of May 1, 2005 

Previously Filed as Exhibit to: 

Exhibit 4.41, File No. 333-71061 

Exhibit 4.42, File No. 333-71061 

June 30, 1999 Form 10-Q, Exhibit 4.2, File 
No. 1-3004 

June 30, 1999 Form 10-Q, Exhibit 4.4, File 
No. 1-3004 
2001 Form 10-K, Exhibit 4.19, File No. 1-
3004 
2001 Form 10-K, Exhibit 4.20, File No. 1-
3004 
December 23, 2002 Form 8-K, Exhibit 4.1, 
File No. 1-3004 

June 19, 2006 Form 8-K, Exhibit 4.13, File 
No. 1-3004 
November 20, 2007 Form 8-K, Exhibit 4.4, 
File No. 1-3004 
April 8, 2008 Form 8-K, Exhibit 4.9, File 
No. 1-3004 
October 23, 2008 Form 8-K, Exhibit 4.4, File 
No. 1-3004 
June 30, 2009 Form 10-Q, Exhibit 4.3, File 
No. 1-3004 

June 19, 2006 Form 8-K, Exhibit 4.4, File 
No. 1-3004 

June 19, 2006 Form 8-K, Exhibit 4.7, File 
No. 1-3004 

November 20, 2007 Form 8-K, Exhibit 4.2, 
File No. 1-3004 

April 8, 2008 Form 8-K, Exhibit 4.4, File 
No. 1-3004 

October 23, 2008 Form 8-K, Exhibit 4.2, File 
No. 1-3004 

May 2, 2005 Form 8-K, Exhibit 4.1, File 
No. 1-14756 

Ameren 
Genco 

Amended and Restated Power Supply Agreement, 
dated March 28, 2008, between Marketing 
Company and Genco 

March 28, 2008 Form 8-K, Exhibit 10.3, File 
No. 1-14756 

197 

 
Exhibit Designation 
10.2 

10.3 

10.4 

10.5 

10.6 

10.7 

10.8 

10.9 

10.10 

10.11 

10.12 

10.13 

10.14 

10.15 

10.16 

10.17 

Registrant(s)  

Ameren 
Genco 

Ameren 
IP 
Ameren Companies 

Ameren 
Genco 
Ameren 
UE 
Genco 
Ameren 
UE 
Genco 

Ameren 
UE 
Genco 
Ameren 
CIPS 
CILCO 
IP 
Ameren 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Nature of Exhibit 

Previously Filed as Exhibit to: 

First Amendment dated January 1, 2010, to 
Amended and Restated Power Supply Agreement, 
dated March 28, 2008, between Marketing 
Company and Genco 
Unilateral Borrowing Agreement by and among 
Ameren, IP and Ameren Services, dated as of 
September 30, 2004 
Third Amended Ameren Corporation System Utility 
Money Pool Agreement, as amended September 
30, 2004 
Ameren Corporation System Amended and 
Restated Non-Regulated Subsidiary Money Pool 
Agreement, dated March 1, 2008 
Amended and Restated Credit Agreement dated 
as of July 14, 2006, among Ameren, UE, Genco 
and JPMorgan Chase Bank, N.A., as agent 
Amendment Agreement dated as of June 30, 
2009, among Ameren, UE, Genco and JPMorgan 
Chase Bank, N.A., as administrative agent, in 
respect of the Amended and Restated Credit 
Agreement dated as of July 14, 2006, among 
Ameren, UE, Genco and JPMorgan Chase Bank, 
N.A., as agent 
Supplemental Credit Agreement dated as of June 
30, 2009, among Ameren, UE, Genco and 
JPMorgan Chase Bank, N.A., as agent  
Credit Agreement dated as of June 30, 2009, 
among Ameren, CIPS, CILCO, IP and JPMorgan 
Chase Bank, N.A., as agent 

*Summary Sheet of Ameren Corporation Non-
Management Director Compensation revised on 
August 8, 2008 
*Ameren’s Long-Term Incentive Plan of 1998 

*First Amendment to Ameren’s Long-Term 
Incentive Plan of 1998 
*Form of Restricted Stock Award under Ameren’s 
Long-Term Incentive Plan of 1998 
*Ameren’s Deferred Compensation Plan for 
Members of the Board of Directors amended and 
restated effective January 1, 2009, dated June 13, 
2008 
*Amendment dated October 12, 2009, to Ameren’s 
Deferred Compensation Plan for Members of the 
Board of Directors, effective January 1, 2010 
*Ameren’s Deferred Compensation Plan for 
Members of the Ameren Leadership Team as 
amended and restated effective January 1, 2001 
*Ameren’s Executive Incentive Compensation 
Program Elective Deferral Provisions for Members 
of the Ameren Leadership Team as amended and 
restated effective January 1, 2001 

October 1, 2004 Form 8-K, Exhibit 10.3, File 
No. 1-3004 

October 1, 2004 Form 8-K, Exhibit 10.2, File 
No. 1-14756 

March 31, 2008 Form 10-Q, Exhibit 10.1, File 
No. 1-14756 

July 18, 2006 Form 8-K, Exhibit 10.1, File 
No. 1-14756 

June 30, 2009 Form 10-Q, Exhibit 10.3, File 
No. 1-14756 

June 30, 2009 Form 10-Q, Exhibit 10.4, File 
No. 1-14756 

June 30, 2009 Form 10-Q, Exhibit 10.2, File 
No. 1-14756 

September 30, 2008 Form 10-Q, Exhibit 
10.1, File No. 1-14756 

1998 Form 10-K, Exhibit 10.1, File No. 1-
14756 
February 16, 2006 Form 8-K, Exhibit 10.6, 
File No. 1-14756 
February 14, 2005 Form 8-K, Exhibit 10.1, 
File No. 1-14756 
June 30, 2008 Form 10-Q, Exhibit 10.3, File 
No. 1-14756 

2000 Form 10-K, Exhibit 10.1, File No. 1-
14756 

2000 Form 10-K, Exhibit 10.2, File No. 1-
14756 

198 

 
  
  
Exhibit Designation 
10.18 

Registrant(s)  
Ameren Companies 

Nature of Exhibit 

*Ameren 2007 Deferred Compensation Plan 

10.19 

10.20 

10.21 

10.22 

10.23 

10.24 

10.25 

10.26 
10.27 

10.28 

10.29 

10.30 

10.31 

10.32 

10.33 

10.34 

10.35 

10.36 

10.37 

10.38 

10.39 

Ameren Companies 

*Ameren 2008 Deferred Compensation Plan 

Ameren Companies 

Ameren Companies 

*Ameren’s Deferred Compensation Plan as 
amended and restated effective January 1, 2010 
*2006 Ameren Executive Incentive Plan 

Ameren Companies 

*2007 Ameren Executive Incentive Plan 

Ameren Companies 

*2008 Ameren Executive Incentive Plan 

Ameren Companies 

*2009 Ameren Executive Incentive Plan 

Ameren Companies 

*2010 Ameren Executive Incentive Plan 

Ameren Companies 
Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren Companies 

*2007 Base Salary Table for Named Executive 
Officers 
*2008 Base Salary Table for Named Executive 
Officers 
*2009 Base Salary Table for Named Executive 
Officers 
*2010 Base Salary Table for Named Executive 
Officers 
*Second Amended and Restated Ameren 
Corporation Change of Control Severance Plan 
*First Amendment dated October 12, 2009, to the 
Second Amended and Restated Ameren Change 
of Control Severance Plan 
*Revised Schedule I to Second Amended and 
Restated Ameren Change of Control Severance 
Plan, as amended 
*Table of 2005 Cash Bonus Awards and 2006 
Performance Share Unit Awards Issued to Named 
Executive Officers 
*Table of 2007 Target Performance Share Unit 
Awards Issued to Named Executive Officers 
*Table of 2008 Target Performance Share Unit 
Awards Issued to Named Executive Officers 
*Table of 2009 Target Performance Share Unit 
Awards Issued to Executive Officers 
*Formula for Determining 2010 Target 
Performance Share Unit Awards to be Issued to 
Named Executive Officers 
*Ameren Corporation 2006 Omnibus Incentive 
Compensation Plan 
*Form of Performance Share Unit Award Issued in 
2006-2008 Pursuant to 2006 Omnibus Incentive 
Compensation Plan 

Previously Filed as Exhibit to: 
December 5, 2006 Form 8-K, Exhibit 10.1, 
File No. 1-14756 
June 30, 2008 Form 10-Q, Exhibit 10.2, File 
No. 1-14756 
October 14, 2009 Form 8-K, Exhibit 10.1, File 
No. 1-14756 
February 16, 2006 Form 8-K, Exhibit 10.2, 
File No. 1-14756 
February 15, 2007 Form 8-K, Exhibit 99.3, 
File No. 1-14756 
December 18, 2007 Form 8-K, Exhibit 99.1, 
File No. 1-14756 
February 19, 2009 Form 8-K, Exhibit 10.1, 
File No. 1-14756 
December 17, 2009 Form 8-K, Exhibit 10.1, 
File No. 1-14756 
March 31, 2007 Form 10-Q, Exhibit 10.2, File 
No. 1-14756 
2008 Form 10-K, Exhibit 10.31, File No. 1-
14756 
2008 Form 10-K, Exhibit 10.36, File No. 1-
14756 

2008 Form 10-K, Exhibit 10.37, File No. 1-
14756 
October 14, 2009 Form 8-K, Exhibit 10.2, File 
No. 1-14756 

February 16, 2006 Form 8-K, Exhibit 10.1, 
File No. 1-14756 

February 15, 2007 Form 8-K, Exhibit 99.4, 
File No. 1-14756 
February 14, 2008 Form 8-K, Exhibit 99.1, 
File No. 1-14756 
March 2, 2009 Form 8-K, Exhibit 99.1, File 
No. 1-14756 
December 17, 2009 Form 8-K, Exhibit 99.1, 
File No. 1-14756 

February 16, 2006 Form 8-K, Exhibit 10.3, 
File No. 1-14756 
February 16, 2006 Form 8-K, Exhibit 10.4, 
File No. 1-14756 

199 

 
  
  
Exhibit Designation 
10.40 

Registrant(s)  
Ameren Companies 

10.41 

10.42 

10.43 

10.44 

10.45 

10.46 

12.1 

Ameren Companies 

Ameren Companies 

Ameren Companies 

Ameren 
CILCO 
Ameren 
CILCO 
Ameren 
CILCO 

Ameren 

Statement re: Computation of Ratios 

12.2 

12.3 

12.4 

12.5 

12.6 

UE 

CIPS 

Genco 

CILCO 

IP 

Nature of Exhibit 

*Form of Performance Share Unit for Award 
Issued in 2009 pursuant to 2006 Omnibus 
Incentive Compensation Plan 
*Form of Performance Share Unit for Award to be 
Issued in 2010 pursuant to 2006 Omnibus 
Incentive Compensation Plan 
*Ameren Supplemental Retirement Plan amended 
and restated effective January 1, 2008, dated 
June 13, 2008 
*First Amendment to amended and restated 
Ameren Supplemental Retirement Plan dated 
October 24, 2008 
*CILCO Executive Deferral Plan as amended 
effective August 15, 1999 
*CILCO Executive Deferral Plan II as amended 
effective April 1, 1999 
*CILCO Restructured Executive Deferral Plan 
(approved August 15, 1999) 

Ameren’s Statement of Computation of Ratio of 
Earnings to Fixed Charges 
UE’s Statement of Computation of Ratio of 
Earnings to Fixed Charges and Combined Fixed 
Charges and Preferred Stock Dividend 
Requirements 
CIPS’ Statement of Computation of Ratio of 
Earnings to Fixed Charges and Combined Fixed 
Charges and Preferred Stock Dividend 
Requirements 
Genco’s Statement of Computation of Ratio of 
Earnings to Fixed Charges 
CILCO’s Statement of Computation of Ratio of 
Earnings to Fixed Charges and Combined Fixed 
Charges and Preferred Stock Dividend 
Requirements 
IP’s Statement of Computation of Ratio of 
Earnings to Fixed Charges and Combined Fixed 
Charges and Preferred Stock Dividend 
Requirements 

Previously Filed as Exhibit to: 

March 2, 2009 Form 8-K, Exhibit 10.1, File 
No. 1-14756 

December 17, 2009 Form 8-K, Exhibit 10.2, 
File No. 1-14756 

June 30, 2008 Form 10-Q, Exhibit 10.1, File 
No. 1-14756 

2008 Form 10-K, Exhibit 10.44, File 
No. 1-14756 

1999 Form 10-K, Exhibit 10, File 
No. 1-2732 
1999 Form 10-K, Exhibit 10(a), File 
No. 1-2732 
1999 Form 10-K, Exhibit 10(e), File 
No. 1-2732 

June 30, 2004 Form 10-Q, Exhibit 14.1, File 
No. 1-14756 

Code of Ethics  

14.1 

Ameren Companies 

Code of Ethics amended as of June 11, 2004 

Subsidiaries of the Registrant 

21.1 

Ameren Companies 

Consent of Experts and Counsel 
Ameren 

23.1 

23.2 

23.3 

23.4 

23.5 

UE 

CIPS 

Genco 

CILCO 

Subsidiaries of Ameren 

Consent of Independent Registered Public 
Accounting Firm with respect to Ameren 
Consent of Independent Registered Public 
Accounting Firm with respect to UE 
Consent of Independent Registered Public 
Accounting Firm with respect to CIPS 
Consent of Independent Registered Public 
Accounting Firm with respect to Genco 
Consent of Independent Registered Public 
Accounting Firm with respect to CILCO 

200 

 
  
  
  
  
  
  
  
  
 
 
 
 
Exhibit Designation 
23.6 

IP 

Registrant(s)  

Power of Attorney 
24.1 
24.2 
24.3 
24.4 
24.5 
24.6 

Ameren 
UE 
CIPS 
Genco 
CILCO 
IP 

Rule 13a-14(a)/15d-14(a) Certifications 

31.1 

Ameren 

31.2 

31.3 

31.4 

31.5 

31.6 

31.7 

31.8 

31.9 

31.10 

31.11 

31.12 

Ameren 

UE 

UE 

CIPS 

CIPS 

Genco 

Genco 

CILCO 

CILCO 

IP 

IP 

Section 1350 Certifications 

32.1 

Ameren 

32.2 

32.3 

32.4 

32.5 

32.6 

UE 

CIPS 

Genco 

CILCO 

IP 

Nature of Exhibit 

Previously Filed as Exhibit to: 

Consent of Independent Registered Public 
Accounting Firm with respect to IP 

Power of Attorney with respect to Ameren 
Power of Attorney with respect to UE 
Power of Attorney with respect to CIPS 
Power of Attorney with respect to Genco 
Power of Attorney with respect to CILCO 
Power of Attorney with respect to IP 

Rule 13a-14(a)/15d-14(a) Certification of Principal 
Executive Officer of Ameren 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Financial Officer of Ameren 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Executive Officer of UE 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Financial Officer of UE 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Executive Officer of CIPS 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Financial Officer of CIPS 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Executive Officer of Genco 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Financial Officer of Genco 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Executive Officer of CILCO 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Financial Officer of CILCO 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Executive Officer of IP 
Rule 13a-14(a)/15d-14(a) Certification of Principal 
Financial Officer of IP 

Section 1350 Certification of Principal Executive 
Officer and Principal Financial Officer of Ameren 
Section 1350 Certification of Principal Executive 
Officer and Principal Financial Officer of UE 
Section 1350 Certification of Principal Executive 
Officer and Principal Financial Officer of CIPS 
Section 1350 Certification of Principal Executive 
Officer and Principal Financial Officer of Genco 
Section 1350 Certification of Principal Executive 
Officer and Principal Financial Officer of CILCO 
Section 1350 Certification of Principal Executive 
Officer and Principal Financial Officer of IP 

201 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit Designation 
Additional Exhibits 
99.1 

99.2 

Ameren 
CILCO 
Ameren 
CILCO 

Ameren 
Ameren 
Ameren 

XBRL - Related Documents 

101.INS** 
101.SCH** 
101.CAL** 

101.LAB** 

101.PRE** 

Ameren 

Ameren 

Registrant(s)  

Nature of Exhibit 

Previously Filed as Exhibit to: 

March 28, 2008 Form 8-K, Exhibit 99.1, File 
No. 1-14756 

Amended and Restated Power Supply Agreement, 
dated March 28, 2008, between Marketing 
Company and AERG 
First Amendment dated January 1, 2010, to 
Amended and Restated Power Supply Agreement, 
dated March 28, 2008, between Marketing 
Company and AERG 

XBRL Instance Document 
XBRL Taxonomy Extension Schema Document 
XBRL Taxonomy Extension Calculation Linkbase 
Document 
XBRL Taxonomy Extension Label Linkbase 
Document 
XBRL Taxonomy Extension Presentation Linkbase 
Document 

The file number references for the Ameren Companies’ filings with the SEC are: Ameren, 1-14756; UE, 1-2967; CIPS, 1-3672; Genco, 333-56594; CILCO,  

1-2732; and IP, 1-3004.  

*Compensatory plan or arrangement.  
**Attached as Exhibit 101 to this report is the following financial information from Ameren’s Annual Report on Form 10-K for the year ended December 31, 

2009, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Statement of Income for the years ended December 31, 2009, 2008 and 
2007, (ii) the Consolidated Balance Sheet at December 31, 2009, and December 31, 2008, (iii) the Consolidated Statement of Cash Flows for the years ended 
December 31, 2009, 2008 and 2007 and (iv) the Combined Notes to the Financial Statements for the year ended December 31, 2009, tagged as blocks of text. 
These Exhibits are deemed furnished and not filed pursuant to Rule 406T of Regulation S-T.  

Each registrant hereby undertakes to furnish to the SEC upon request a copy of any long-term debt instrument not listed above that such registrant has not 

filed as an exhibit pursuant to the exemption provided by Item 601(b)(4)(iii)(A) of Regulation S-K.  

202 

 
 
 
 
 
 
 
  
RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL FINANCIAL OFFICER OF AMEREN CORPORATION  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

Exhibit 31.2  

I, Martin J. Lyons, Jr., certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Ameren Corporation;  
2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and 
Chief Financial Officer 
(Principal Financial Officer) 

 
  
 
Exhibit 31.3  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL EXECUTIVE OFFICER OF UNION ELECTRIC COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Warner L. Baxter, certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Union Electric 

Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Warner L. Baxter 
Warner L. Baxter 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

 
  
 
Exhibit 31.4  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL FINANCIAL OFFICER OF UNION ELECTRIC COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Martin J. Lyons, Jr., certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Union Electric 

Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and 
Chief Financial Officer 
(Principal Financial Officer) 

 
  
 
Exhibit 31.5  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL EXECUTIVE OFFICER OF CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Scott A. Cisel, certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Central Illinois Public 

Service Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Scott A. Cisel 
Scott A. Cisel 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

 
  
 
Exhibit 31.6  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL FINANCIAL OFFICER OF CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Martin J. Lyons, Jr., certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Central Illinois Public 

Service Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and 
Chief Financial Officer 
(Principal Financial Officer) 

 
  
 
RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL EXECUTIVE OFFICER OF  
AMEREN ENERGY GENERATING COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

Exhibit 31.7  

I, Charles D. Naslund, certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Ameren Energy 

Generating Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Charles D. Naslund 
Charles D. Naslund 
Chairman and President 
(Principal Executive Officer) 

 
  
 
Exhibit 31.8  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL FINANCIAL OFFICER OF AMEREN ENERGY GENERATING COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Martin J. Lyons, Jr., certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Ameren Energy 

Generating Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and 
Chief Financial Officer 
(Principal Financial Officer) 

 
  
 
Exhibit 31.9  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL EXECUTIVE OFFICER OF CENTRAL ILLINOIS LIGHT COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Scott A. Cisel, certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Central Illinois Light 

Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Scott A. Cisel 
Scott A. Cisel 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

 
  
 
Exhibit 31.10  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL FINANCIAL OFFICER OF CENTRAL ILLINOIS LIGHT COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Martin J. Lyons, Jr., certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Central Illinois Light 

Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and 
Chief Financial Officer 
(Principal Financial Officer) 

 
  
 
Exhibit 31.11  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL EXECUTIVE OFFICER OF ILLINOIS POWER COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Scott A. Cisel, certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Illinois Power 

Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Scott A. Cisel 
Scott A. Cisel 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

 
  
 
Exhibit 31.12  

RULE 13a-14(a)/15d-14(a) CERTIFICATION  
OF PRINCIPAL FINANCIAL OFFICER OF ILLINOIS POWER COMPANY  
(required by Section 302 of the Sarbanes-Oxley Act of 2002)  

I, Martin J. Lyons, Jr., certify that:  
1.    I have reviewed this report on Form 10-K for the fiscal year ended December 31, 2009 of Illinois Power 

Company;  

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a 
material fact necessary to make the statements made, in light of the circumstances under which such statements were 
made, not misleading with respect to the period covered by this report;  

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, 
the periods presented in this report;  

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls 
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting 
(as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be 
designed under our supervision, to ensure that material information relating to the registrant, including its 
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period 
in which this report is being prepared;  

b)  Designed such internal control over financial reporting, or caused such internal control over financial 

reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles;  

c)  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 

report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the 
period covered by this report based on such evaluation; and  

d)  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred 

during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual 
report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control 
over financial reporting; and  

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal 
control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or 
persons performing the equivalent functions):  

a)  All significant deficiencies and material weaknesses in the design or operation of internal control over 

financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

b)  Any fraud, whether or not material, that involves management or other employees who have a significant role 

in the registrant’s internal control over financial reporting.  

Date: February 26, 2010  

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and 
Chief Financial Officer 
(Principal Financial Officer) 

 
  
 
SECTION 1350 CERTIFICATION OF  
AMEREN CORPORATION  
(required by Section 906 of the  
Sarbanes-Oxley Act of 2002)  

Exhibit 32.1  

In connection with the report on Form 10-K for the fiscal year ended December 31, 2009 of Ameren Corporation 
(the “Registrant”) as filed by the Registrant with the Securities and Exchange Commission on the date hereof (the “Form 
10-K”), each undersigned officer of the Registrant does hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant 
to §906 of the Sarbanes-Oxley Act of 2002, that:  
(1)  The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 

(15 U.S.C. 78m or 78o(d)); and  

(2)  The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and 

results of operations of the Registrant.  

Date: February 26, 2010  

/s/ Thomas R. Voss 
Thomas R. Voss 
President and Chief Executive Officer 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and Chief Financial 
Officer 
(Principal Financial Officer) 

 
  
 
 
SECTION 1350 CERTIFICATION OF  
UNION ELECTRIC COMPANY  
(required by Section 906 of the  
Sarbanes-Oxley Act of 2002)  

Exhibit 32.2  

In connection with the report on Form 10-K for the fiscal year ended December 31, 2009 of Union Electric Company 
(the “Registrant”) as filed by the Registrant with the Securities and Exchange Commission on the date hereof (the “Form 
10-K”), each undersigned officer of the Registrant does hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant 
to §906 of the Sarbanes-Oxley Act of 2002, that:  
(1)  The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 

(15 U.S.C. 78m or 78o(d)); and  

(2)  The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and 

results of operations of the Registrant.  

Date: February 26, 2010  

/s/ Warner L. Baxter 
Warner L. Baxter 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and Chief Financial 
Officer 
(Principal Financial Officer) 

 
  
 
 
SECTION 1350 CERTIFICATION OF  
CENTRAL ILLINOIS PUBLIC SERVICE COMPANY  
(required by Section 906 of the  
Sarbanes-Oxley Act of 2002)  

Exhibit 32.3  

In connection with the report on Form 10-K for the fiscal year ended December 31, 2009 of Central Illinois Public 
Service Company (the “Registrant”) as filed by the Registrant with the Securities and Exchange Commission on the date 
hereof (the “Form 10-K”), each undersigned officer of the Registrant does hereby certify, pursuant to 18 U.S.C. §1350, as 
adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:  
(1)  The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 

(15 U.S.C. 78m or 78o(d)); and  

(2)  The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and 

results of operations of the Registrant.  

Date: February 26, 2010  

/s/ Scott A. Cisel 
Scott A. Cisel 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and Chief Financial 
Officer 
(Principal Financial Officer) 

 
  
 
 
SECTION 1350 CERTIFICATION OF  
AMEREN ENERGY GENERATING COMPANY  
(required by Section 906 of the  
Sarbanes-Oxley Act of 2002)  

Exhibit 32.4  

In connection with the report on Form 10-K for the fiscal year ended December 31, 2009 of Ameren Energy 

Generating Company (the “Registrant”) as filed by the Registrant with the Securities and Exchange Commission on the 
date hereof (the “Form 10-K”), each undersigned officer of the Registrant does hereby certify, pursuant to 18 U.S.C. 
§1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:  
(1)  The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 

(15 U.S.C. 78m or 78o(d)); and  

(2)  The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and 

results of operations of the Registrant.  

Date: February 26, 2010  

/s/ Charles D. Naslund 
Charles D. Naslund 
Chairman and President 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and Chief Financial 
Officer 
(Principal Financial Officer) 

 
  
 
 
SECTION 1350 CERTIFICATION OF  
CENTRAL ILLINOIS LIGHT COMPANY  
(required by Section 906 of the  
Sarbanes-Oxley Act of 2002)  

Exhibit 32.5  

In connection with the report on Form 10-K for the fiscal year ended December 31, 2009 of Central Illinois Light 
Company (the “Registrant”) as filed by the Registrant with the Securities and Exchange Commission on the date hereof 
(the “Form 10-K”), each undersigned officer of the Registrant does hereby certify, pursuant to 18 U.S.C. §1350, as 
adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:  
(1)  The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 

(15 U.S.C. 78m or 78o(d)); and  

(2)  The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and 

results of operations of the Registrant.  

Date: February 26, 2010  

/s/ Scott A. Cisel 
Scott A. Cisel 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and Chief Financial 
Officer 
(Principal Financial Officer) 

 
  
 
 
SECTION 1350 CERTIFICATION OF  
ILLINOIS POWER COMPANY  
(required by Section 906 of the  
Sarbanes-Oxley Act of 2002)  

Exhibit 32.6  

In connection with the report on Form 10-K for the fiscal year ended December 31, 2009 of Illinois Power Company 
(the “Registrant”) as filed by the Registrant with the Securities and Exchange Commission on the date hereof (the “Form 
10-K”), each undersigned officer of the Registrant does hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant 
to §906 of the Sarbanes-Oxley Act of 2002, that:  
(1)  The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 

(15 U.S.C. 78m or 78o(d)); and  

(2)  The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and 

results of operations of the Registrant.  

Date: February 26, 2010  

/s/ Scott A. Cisel 
Scott A. Cisel 
Chairman, President and Chief Executive Officer 
(Principal Executive Officer) 

/s/ Martin J. Lyons, Jr. 
Martin J. Lyons, Jr. 
Senior Vice President and Chief Financial 
Officer 
(Principal Financial Officer) 

 
  
 
 
 
 
Investor Information

COMMON STOCK  AND DIVIDEND INFORMATION  
Ameren’s common stock is listed on the New York Stock 
Exchange (ticker symbol: AEE). Ameren began trading on 
January 2, 1998, following the merger of Union Electric Company 
and CIPSCO Inc. on December 31, 1997. Ameren common 
shareholders of record totaled 70,094 on December 31, 2009. 
The following table provides the closing price ranges and 
dividends paid per Ameren common share for each quarter 
during 2009 and 2008.

AEE 2009

Quarter Ended 

High 

Low   Close 

  Dividends
Paid

March 31 

June 30 

September 30 

December 31 

AEE 2008

$35.35  $19.51  $23.19 
21.75 
23.09 

24.89 

25.25 

25.28 

27.66 

28.67   23.78 

27.95 

38 1⁄2 ¢
38 1⁄2 
38 1⁄2 
38 1⁄2

Quarter Ended 

High 

Low   Close 

  Dividends
Paid

March 31 

June 30 

September 30 

December 31 

48.39 

$54.29  $40.92  $44.04 
41.34 
38.49 

63 1⁄2 ¢
63 1⁄2 
63 1⁄2 
        39.15      25.51     33.26        63 1⁄2

43.16 

39.03 

42.23 

ANNUAL MEETING  
The annual meeting of Ameren Corporation shareholders will 
convene at 9 a.m. (Central Time), Tuesday, April 27, 2010, at Powell 
Symphony Hall, 718 North Grand Boulevard, St. Louis, MO. The 
annual shareholder meetings of Central Illinois Light Company, 
Central Illinois Public Service Company, Illinois Power Company 
and Union Electric Company will be held at the same time.

DRPLUS 
Any person of legal age or entity, whether or not an Ameren 
shareholder, is eligible to participate in DRPlus, Ameren’s dividend 
reinvestment and stock purchase plan. Participants can: 

•  make cash investments by check or automatic direct debit 
to their bank accounts to purchase Ameren common stock, 
totaling up to $120,000 annually, 

•  reinvest their dividends in Ameren common stock or receive 

Ameren dividends in cash, and

•  place Ameren common stock certificates in safekeeping and 

receive regular account statements.

For more information about DRPlus, you may obtain a prospectus 
from the company’s Investor Services representatives.

DIRECT DEPOSIT  OF DIVIDENDS 
All registered Ameren common and Central Illinois Light  
Company, Central Illinois Public Service Company, Illinois Power 
Company and Union Electric Company preferred shareholders  
can have their cash dividends automatically deposited to their  
bank accounts. This service gives shareholders immediate  
access to their dividend on the dividend payment date and 
eliminates the possibility of lost or stolen dividend checks.

CORPORATE GOVERNANCE DOCUMENTS  
Ameren makes available, free of charge through its Web site 
(www.ameren.com), the charters of the board of directors’ audit 
and risk committee, human resources committee, nominating and 

corporate governance committee, nuclear oversight committee, 
finance committee and public policy committee. Also available 
on Ameren’s Web site are its corporate governance guidelines, 
director nomination policy, communications to the board of 
directors policy, policy and procedures with respect to related-
person transactions, Code of Business Conduct (referred to 
as the “Corporate Compliance Policy”) and its Code of Ethics 
for principal executive and senior financial officers. These 
documents are also available in print, free of charge upon written 
request, from the Office of the Secretary, Ameren Corporation, 
P.O. Box 66149, Mail Code 1370, St. Louis, MO 63166-6149. 
Ameren also makes available, free of charge through its Web 
site, the company’s annual reports on Securities and Exchange 
Commission (SEC) Form 10-K, quarterly reports on SEC Form 
10-Q and its current reports on SEC Form 8-K, including any 
chief executive officer and chief financial officer certifications 
required to be filed with the SEC therewith filed. 

ONLINE STOCK ACCOUNT ACCESS  
Ameren’s Web site (www.ameren.com) allows registered 
shareholders to access their account information online. 
Shareholders can securely change their reinvestment options, 
view account summaries, receive DRPlus statements and more 
through the Web site. This is a free service. 

INVESTOR SERVICES  
Ameren’s Investor Services representatives are available to  
help you each business day from 8:00 a.m. to 4:00 p.m.  
(Central Time). Please write or call:

Ameren Services Company, Investor Services, P.O. Box 66887, 
St. Louis, MO 63166-6887. Phone: 314-554-3502 or toll-free: 
800-255-2237. Email: invest@ameren.com

TRANSFER AGENT, REGISTRAR  AND PAYING AGENT 
The Transfer Agent, Registrar and Paying Agent for Ameren 
common stock and Central Illinois Light Company, Central Illinois 
Public Service Company, Illinois Power Company and Union 
Electric Company preferred stock is Ameren Services Company.

Ameren Corporation 
One Ameren Plaza 
1901 Chouteau Avenue 
St. Louis, MO 63103 
314-621-3222

ExTEND YOUR DIVIDEND TAx RATE REDUCTION

In 2003, Congress passed an important law—the Jobs and 
Growth Tax Reconciliation Act of 2003, which, as amended, 
expires in 2010 unless extended by Congress. The law 
reduced to 15 percent the maximum individual tax rate 
on qualified dividends. Prior to enactment of this law, the 
maximum tax rate on dividend income was 38.6 percent. 
The dividend tax rate reduction is achieving highly favorable 
results. The law promotes economic growth and benefits 
the millions of Americans who depend on dividend income. 

To encourage Congress to extend the dividend tax 
reduction, visit www.defendmydividend.org and let your 
congressional representative know you are interested in 
extending the dividend tax rate reduction to encourage 
Americans to continue investing and drive U.S. 
economic growth. 

 
 
 
 
 
 
 
 
P.O. Box 66149
St. Louis, MO 63166-6149
www.ameren.com