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Northwest Natural Company

nwn · NYSE Utilities
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Employees 1001-5000
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FY2011 Annual Report · Northwest Natural Company
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EFFICIENT. AFFORDABLE. BLUE.

N W   N AT U R A L   2 0 11   A N N U A L   R E P O R T

CORPORATE PROFILE

FINANCIAL OVERVIEW

NW Natural (NYSE: NWN) is a 153-year-old 

natural gas local distribution and storage 

company headquartered in Portland, Oregon. 

NW Natural serves about 680,000 utility 

customers in Oregon and Southwest 

Washington, and provides gas storage to 

customers on the West Coast. In keeping 

EARNINGS

Financial facts ($000):

  Gross operating revenues 

  Net operating revenues 

  Net income 

Financial ratios (%): 

2011 

2010 

PERCENT
INCREASE
(DECREASE )

 848,796  

 369,433  

 63,898  

 812,106  

 367,581  

 72,667  

 5 

 1 

 (12 )

with its steady growth, the company has 

  Return on average common equity 

 9.1  

 10.7  

 (15 ) 

increased dividends paid to shareholders 

  Capital structure at year-end: 

for 56 consecutive years.

SERVICE TERRITORY
AND STORAGE FACILITIES

WASHINGTON

ASTORIA

MIST STORAGE

VANCOUVER

GASCO LNG

PORTLAND

THE DALLES

LINCOLN CITY

NEWPORT LNG

SALEM

ALBANY

EUGENE

COOS BAY

  Long-term debt 

  Common stock equity 

COMMON STOCK 

Shareholder data (000): 

 47.3  

 52.7  

 46.1  

 53.9  

  Average shares outstanding-basic 

  Year-end shares outstanding 

 26,687  

 26,756  

 26,589  

 26,668  

Per share data ($): 

  Basic earnings 

  Diluted earnings 

  Dividends paid 

  Dividend rate at year-end 

  Book value at year-end 

  Market value at year-end 

 2.39  

 2.39  

 1.75  

 1.78  

 26.70  

 47.93  

 2.73  

 2.73  

 1.68  

 1.74  

 25.99  

 46.47  

OREGON

Gas sales and transportation deliveries (000 therms) 

 1,152,354  

 1,061,969  

UTILITY OPERATING HIGHLIGHTS

Degree days 

Customers at year-end 

Employees at year-end 

 4,652  

 679,543  

 1,050  

 4,171  

 673,997  

 1,028  

KEY

NW NATURAL SERVICE TERRITORY
REGIONAL RESOURCE CENTER
LNG PLANT
MIST STORAGE
GILL RANCH STORAGE
HEADQUARTERS

NEVADA

DIVIDENDS PAID ON COMMON STOCK (PER SHARE)
PAYMENT DATE

February 15 

May 15 

August 15 

November 15 

$  0.435  

$ 0.415  

  0.435  

 0.435  

0.445 

0.415

 0.415 

0.435

  Total dividends paid 

$ 1.750 

$ 1.680

 3 

 (2 )

 – 

 – 

 (12 ) 

 (12 ) 

 4 

 2 

 3  

 3 

 9 

 12 

 1 

 2 

SAN FRANCISCO

DILUTED EARNINGS PER SHARE
(in dollars)

DIVIDENDS PAID PER SHARE
(in dollars)

GILL RANCH

FRESNO

CALIFORNIA

LOS ANGELES

SAN DIEGO

$3.00

2.50

2.00

1.50

1.00

.50

0

$1.80

1.70

1.60

1.50

1.40

1.30

2007

2008

2009

2010

2011

2007

2008

2009

2010

2011

Diluted earnings per share were $2.39 in 2011.

Annual dividends paid per share in 2011 increased 
for the 56th consecutive year. The current indi-
cated annual dividend is $1.78 per share.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
  
 
 
  
TABLE OF CONTENTS

LETTER TO SHAREHOLDERS .......................................................................... 4

2011 HIGHLIGHTS ...................................................................................... 10 

FINANCIAL OVERVIEW ................................................................................. 12

CORPORATE OFFICERS ................................................................................ 18

BOARD OF DIRECTORS ................................................................................ 19

QUARTERLY FINANCIAL INFORMATION .......................................................... 20

SHAREHOLDER INFORMATION ...................................................................... 21

FORM 10-K ANNUAL REPORT

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44

LETTER TO SHAREHOLDERS

Gregg Kantor, President and CEO, 
with Paul O’Neal, Manager, 
Operations and Support Services. 

Clean-burning natural gas is becoming an increasingly 
popular transportation fuel, as commercial fleet man-
agers look to reduce emissions and fuel costs. Last 
year, NW Natural added to the number of compressed 
natural gas vehicles in its fleet.

Effi  cient. Aff ordable. Blue.

Our accomplishments in 2011 included:

In 2011, natural gas continued its rise to pre-emi-

nence as the nation’s fuel of choice. With electric 

costs climbing, abundant supplies and lower prices 

make our product increasingly competitive in the 

marketplace. Efficient and affordable natural gas, 

which we call “Blue,” is now leading our nation to 

a new energy future. 

Last year, NW Natural also demonstrated it contin-

ues to be among the leaders in its industry. Despite 

a one-time charge due to a change in Oregon’s 

utility tax laws, the company stayed focused on 

delivering superior service and creatively capturing 

added value for its customers and shareholders. 

2011 HIGHLIGHTS

•  Reduced customer rates in Oregon and Washington for the 
third consecutive year due to lower gas prices, resulting 
in a 20 percent rate decrease in Oregon and a 26 percent 
rate decrease in Washington over the last three years;

•  Posted the second-highest score in the nation in the J.D. 
Power and Associates Gas Utility Residential Customer 
Satisfaction Study; ranked second in the West in its Gas 
Utility Business Customer Satisfaction Study;

•  Entered into an agreement with Encana Oil & Gas (USA) Inc. 
to acquire gas reserves for customers. The rate-based 
investment is designed to provide low-cost supplies over 
a 30-year period; 

•  Produced total shareholder return of over 7 percent and 

raised our dividend for the 56th consecutive year;  

•  Maintained strong investment-grade credit ratings on the 

company’s long-term debt of A-1/A+. 

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5

Repeal of tax law requires charge

Last year, NW Natural posted earnings of $2.39 per share. While the 

company moved forward on many fronts in 2011, it was required to 

take a one-time, after-tax charge of $4.4 million (17 cents per share) 

related to the repeal of Oregon Senate Bill 408. 

Senate Bill 408, enacted in 2005, required utilities to annually true up 

taxes that were collected from customers. The true up was complicat-

ed and could result in large refunds or collections from customers. Both 

outcomes made little sense for customers or utilities, and NW Natural 

supported the repeal of Senate Bill 408. While we had benefited in 

the past from the tax true-up law, the risk existed that the company 

could end up in the opposite situation. 

credit standards. On the positive side, residential 

and commercial conversions remained steady, 

helping the company keep its customer growth rate 

at just under 1 percent. 

Given the sustained economic challenges facing 

our region, we were pleased to announce for the 

third year in a row a rate decrease for utility cus-

tomers due to lower gas prices. Rates have been 

reduced by about 20 percent in Oregon and 

26 percent in Washington over the past three 

years, and customers paid less for their natural 

gas this past winter than they did seven years ago.

The new law reverts back to having utility income taxes considered by 

Striving to be the best in service and safety  

state regulators in each rate case, as is the practice across the rest 

of the nation. Over the long run, we believe that’s in the best interest of 

our customers and the company. Unfortunately, in repealing the law the 

legislature chose to do so retroactively, creating the one-time charge.

A preference for “Blue”

Last year was the fifth consecutive year the com-

pany scored among the top two in the nation in the 

J.D. Power and Associates Gas Utility Residential 

Customer Satisfaction Study. These consistently 

high marks are an important measure of how 

effectively we are meeting customer expectations 

Homeowners and businesses prefer natural gas: It’s clean, afford-

over time.

able, reliable and efficient. Last year we highlighted those benefits in 

our new “Blue” advertising campaign that focused on the attributes 

customers most appreciate about our product. With an estimated 56 

percent market share in single-family housing in our service territory, 

we’re positioned to leverage our increasing price advantage over 

electricity and oil to support customer growth going forward. 

Despite a strong consumer preference for natural gas, the weak 

economy nationally and regionally continued to depress new cus-

tomer additions. Unemployment in Oregon and Southwest Washing-

ton hovered between 9 and 10 percent during 2011. And like most 

of the country, the Northwest housing market struggled with slow 

new construction activity, persistent real estate foreclosures and tight 

There are many factors that drive customer satis-

faction – price, employee interactions, and call wait 

times to name just a few. Clearly, a key driver is 

how well we do at public safety. Through the years, 

we have developed one of the most proactive pipe-

line integrity management programs in the country. 

In fact, with the support of regulators and customer 

groups, NW Natural was one of the fi rst local distri-

bution companies to replace all the cast iron pipes 

in its system. And while many gas utilities across the 

country have thousands of miles of cast iron and 

Our “Blue” advertising 
campaign touts the effi -
ciency and affordability 
of natural gas, which 
customers consider 
important attributes.

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6

LETTER TO SHAREHOLDERS

BARE STEEL AND CAST IRON REPLACEMENT

to require local distribution companies like NW Natural to attain even 

higher safety standards. 

1,250

1,000

l
e
e
t
s

e
r
a
b

f
o

s
e
l
i

M

750

500

250

0

1986

1991

1996

2001

2006

2011

n
o
r
i

t
s
a
c

f
o

s
e
l
i

M

250

200

150

100

50

0

On December 13, 2011, Congress passed the “Pipeline Safety, Regula-

tory Certainty, and Job Creation Act of 2011.” President Obama signed 

the legislation into law on January 3, 2012. The new legislation addresses 

a wide range of pipeline safety issues, including requirements for remote 

or automatic shut-off valves on transmission lines, expanding integrity 

management programs to include additional transmission pipelines 

and verifi cation of records for maximum allowable operating pressures 

of transmission lines. NW Natural will continue to work diligently with 

federal and state regulators and industry associations to ensure the 

company’s compliance with all provisions of the new law.  

A year of challenges and opportunities 

Abundant natural gas supplies and lower prices have been good 

for customers and the company’s satisfaction ratings. But lower 

BARE STEEL

CAST IRON

and less volatile prices have driven storage values down, creating a 

The company has about 21 miles of bare steel main left 
in our system. There has been no cast iron pipe in our 
system since 2000.

challenge for our non-utility storage business. This was particularly 

true for our Gill Ranch Storage facility in California, which is now in 

its second year of operation. 

bare steel pipes, we have about 21 miles of bare 

steel left in our system and expect to eliminate it 

While storage values remain lower than we’d like to see, we know 

from our experience that it’s a cyclical business. Given the projected 

demand for gas to serve electric generation in the West, we believe 

in our strategy – and the value of storage over the long term.

completely over the next few years.

The reservoirs at Gill Ranch are functioning well, and in some cases 

Our proactive approach to pipeline integrity has 

positioned us well in light of tragic natural gas-related 

incidents in California, Ohio and Pennsylvania that 

exceeding our expectations. We are on track to reach full injection 

of our portion of the facility’s designed capacity, approximately 

15 billion cubic feet, before the end of 2012. 

have resulted in a heightened national awareness 

Results from our Mist storage facility in Oregon continue to be solid 

about pipeline safety issues. Federal safety require-

but were down from 2010 primarily due to lower revenues from 

ments have become more stringent and compre-

optimization services, which have also been impacted by today’s 

hensive over the last few years and will continue 

abundant gas supplies.

NW Natural’s proactive 
pipeline replacement pro-
grams have positioned us 
well for new regulations.

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7

Low gas prices provided a win-win oppor-
tunity for customers and shareholders to 
purchase long-term supplies through an 
innovative agreement with Encana.

Looking forward, our focus on the storage business will remain 

The investment pays for a portion of expected 

consistent – execute on our operational plans and identify new 

drilling costs in exchange for working interests in 

commercial opportunities that take advantage of the growing 

certain sections of the Jonah Field in Wyoming, 

reliance on natural gas. 

considered one of the top 10 largest natural gas 

With every challenge there are opportunities. While today’s glut of 

fields in the United States.

natural gas has driven down storage values, it has also provided an 

During the first 10 years, we anticipate the volume 

opening to lock in long-term supplies for our Oregon utility custom-

of gas produced to provide approximately 8 to 10 

ers. In February of 2011, we entered into an innovative gas reserves 

percent of NW Natural’s average annual require-

purchase agreement with Encana Oil & Gas (USA) Inc. 

ments for its utility customers, and at least 90 Bcf 

Under the agreement, NW Natural will invest between $45 million 

and $55 million a year for five years – for a total investment of about 

$250 million – to acquire gas reserves. These reserves are expected 

to provide low-cost supplies over a 30-year period. The investment 

over the next three decades. We estimated these 

gas reserves could save customers more than 

$50 million on a net present value basis over the 

life of the agreement.

is placed into rate base, and NW Natural earns a regulated return 

In our view, this investment reflects our strong 

with a similar risk profile as other utility investments. 

track record of finding win-win opportunities for our 

TOTAL SHAREHOLDER RETURN
(annualized as a percent, including reinvestment of dividends)

one year

three years

five years

ten years

12%

10

8

6

4

2

0

2011

2009-2011

2007-2011

2002-2011

customers and the company. It also demonstrates 

the willingness of the Public Utility Commission of 

Oregon (OPUC) and consumer advocates to take 

on complex and innovative ideas that benefit both 

customers and the company. The Commission and 

consumer advocates deserve a great deal of credit 

for advancing this landmark agreement.

Infrastructure for the future

Natural gas has a critical role to play in meeting 

our future energy needs and our carbon reduction 

goals. To that end, we remain committed to building 

additional pipeline infrastructure that will address 

future natural gas demand in our region for base-

load electric generation, to back up renewables 

and for direct use in homes and businesses.

Palomar Pipeline is a joint project with TransCanada 

that would provide additional pipeline capacity 

and redundancy for the Northwest. While Palomar 

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8

LETTER TO SHAREHOLDERS

withdrew its Federal Energy Regulatory Commission 

for adequate storage capacity. With storage assets in both Oregon 

application last year, it announced plans to fi le a new 

and California, NW Natural is capable of expanding existing facilities 

application refl ecting changes to the project. Those 

to address this need. In fact, we are evaluating the potential expan-

changes include the elimination of the originally 

sion of our Mist storage facility in Oregon, which will require a second 

planned west section of the pipeline, which would 

compression station, new wells and additional pipeline-gathering 

have connected to a previously proposed liquefi ed 

facilities. We also have the ability to expand the Gill Ranch facility in 

natural gas import terminal on the Columbia River.

California without further expansion of our gas transmission pipeline. 

The newly configured project would also reroute 

the eastern section of Palomar to run from Madras 

across the Confederated Tribes of Warm Springs 

Reservation to NW Natural’s system in Molalla, 

Oregon. The modifi ed route is shorter and reduces 

the number of miles the pipeline crosses the 

Mt. Hood National Forest by about 35 percent.

While any expansion of storage at either location will be driven by 

market demand, we are well positioned to provide additional capacity 

when the time is right. 

Strengthening the core

Creating additional shareholder value through investments in gas 

infrastructure is a key element of our business strategy. But to be 

clear, NW Natural is a natural gas distribution company, and we have 

This year our goal is to continue to work with North-

no intention of losing sight of that fact. It is that clarity of purpose that 

west utilities to consolidate the region’s effort around 

has led us to innovations like our decoupling rate mechanism and the 

a single, integrated pipeline solution using this new 

Encana gas reserves investment.   

Palomar route. We are working toward an open 

season aimed at identifying enough shipper support 

to proceed with the permitting process.    

At our core, we are a regulated utility, and that means we need to make 

sure our rates and regulatory mechanisms appropriately support our 

activities. Last December, we filed with the OPUC for only the fourth 

Today during peak demand periods, the existing 

general rate increase request in 23 years, and the first since 2002.

interstate pipeline serving the Northwest is at 

maximum capacity. With coal plants in Boardman, 

Oregon and Centralia, Washington beginning to 

shut down as soon as 2020, additional natural 

gas pipeline infrastructure to support base load 

electric generation – and to back up solar and wind 

generation – is essential. In our view, the question 

isn’t if additional pipeline capacity is needed in the 

region, but when. 

We filed for a number of reasons. First, after allowing the company 

to rate-base the $250 million investment in gas reserves described 

previously, the Commission wanted the opportunity to review our 

rates. Second, our decoupling, weather normalization and system 

integrity mechanisms were due to expire and needed to be renewed. 

And third, after nine years without a rate case, our costs have 

increased. While we are proud of having managed our business 

to avoid an increase in our rates for that long, it was simply time to 

have that across-the-board discussion with the Commission and 

The growing reliance on natural gas for power 

the customer advocates that can only come in the context 

generation in the West will also increase the need 

of a rate case.  

Additional pipeline 
infrastructure is critical 
as more utilities rely on 
natural gas for power 
generation to reduce 
carbon emissions.

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9

An innovative and fl ex-
ible workforce is a key 
driver of our success 
and plays an important 
role in our ability to 
turn challenges into 
opportunities.

The requests we are making as part of the case will allow us to 

You can see it in our industry-leading efforts on 

continue to meet customer expectations for a safe, reliable system 

decoupling, acquiring natural gas reserves and 

and quality service – while providing a fair return for our shareholders. 

providing our customers a carbon offset program. 

If approved as filed, the request would result in an overall revenue 

increase of about 6 percent, or $44 million. The filing addresses 

increases in costs associated with pipeline safety programs, main-

We have demonstrated our ability to be innovators, 

and our employees have consistently shown their 

exceptional talents and dedication to service.  

taining the company’s pipeline system, enhanced customer service 

All of this will help us better connect “Blue” to 

offerings, and higher operating expenses.  

Separate from the revenue increase request, the company is also 

proposing a mechanism to address cleanup expenses related to its 

legacy manufactured gas plant operations. The proposal would collect 

in rates only those costs that insurance does not cover and would 

do so over many years to lessen the impact on customer bills. This 

mechanism could result in an additional 1 to 3 percent rate increase, 

depending on insurance recovery collections and cleanup project 

a greener future. NW Natural’s product, pipes, 

storage and employees are tremendous assets 

in a place where advancing green technology and 

reducing carbon emissions are top priorities. As 

we have done in the past, NW Natural will con-

tinue to devote itself to creating new opportunities 

that provide wins for both our customers and our 

shareholders.

costs that occur between now and the date new rates take effect. 

On behalf of NW Natural’s offi cers, management and 

We expect new rates in place no later than November 1, 2012. 

employees, thank you again for your confidence 

Since our last general rate increase request in 2002, we’ve stream-

and support.   

lined operations and kept increases in our costs to serve customers 

Sincerely, 

below the inflation rate. We’ve managed our business well and 

done all we can to keep rates as low as possible for our customers. 

In fact, because of our cost control efforts and lower natural gas 

prices, even with this rate increase, customers will be paying less 

for gas service than they did in 2005.

A culture of innovation and opportunity

The Pacifi c Northwest is a special place, one that attracts talented 

people with enormous creativity – people excited about innovation, 

people with a service ethic who are deeply committed to shaping 

their own future. You can see the results of this in everything 

from the region’s land-use laws and light rail investments to the 

success of companies like Nike, Intel, Columbia Sportswear and 

Wieden+Kennedy. This culture of innovation and service is 

also very much a part of NW Natural.  

Gregg S. Kantor

President and CEO

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10

2011 HIGHLIGHTS

We are using new training programs, 
technology and a specialized call center 
to ensure effective emergency response.

Safe and responsive  

Top-rated customer service

NW Natural’s philosophy is to build and operate 

NW Natural was recognized as a J.D. Power and Associates 2011 

pipelines that meet or exceed all safety regula-

Customer Service Champion — one of only 40 companies across all 

tions. But it’s not enough to have a well-built, 

industries to have earned this distinction. To qualify for inclusion on this 

well-maintained pipeline system – because 

elite list, companies must not only excel within their own industries, but 

third-party damage and other unexpected incidents 

also must stand out among service leaders in 20 major industries evalu-

do happen. So NW Natural has been focusing 

ated by J.D. Power. NW Natural was one of only two utilities on the list. 

on emergency responsiveness. Over the last two 

years, more than 300 employees have been trained 

New website puts service at customers’ fi ngertips 

as first responders to emergency situations; the 

company created a new, specialized unit within 

the Customer Contact Center dedicated only to 

answering emergency calls 24/7; and it invested 

in new software tools to streamline internal 

processing of emergency calls to speed 

emergency response after hours.

For nearly a decade, NW Natural has ranked 
among the highest in the Western region among 
gas utilities for overall customer satisfaction in 
the annual J.D. Power and Associates Study.

We launched our redesigned website in 2011 with the goal of improv-

ing customer self-service through a streamlined dashboard of web 

services. In one year, the new site facilitated more than 810,000 web 

payments, produced a 13 percent increase in unique visitors, and 

increased viewing of our usage history feature by 115 percent.

Leading the pack in paperless billing 

Our successful paperless billing campaign increased enrollments 

almost 10 percent last year to about 108,000 customers. This 

means 16 percent of our customers are now on paperless billing, 

which is well ahead of the industry average of 12 percent. 

Hot new natural gas products 

Customers living in apartments or homes sized 1,500 square feet or 

smaller have a new option to use natural gas fireplaces as a primary 

heating source. New heat-rated hearths are a cost-effective way to 

attract new gas customers in the multifamily market.

Another exciting development is the use of tankless water heaters to 

heat water and space in single and multifamily residences. Space 

heat can be provided by using a hot water coil mounted in an air 

handling unit, by using fan coil units or radiators in individual rooms 

to provide zoning capability, or by installing a radiant floor system. 

An advantage of these new models is only one piece of equipment 

needs to be installed to provide both hot water and space heat.

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11

Shrinking the footprint

The great news for businesses and the environment 

these days is that sustainable actions save money.  

So when NW Natural began retrofi tting its resource 

centers, green features were integral to the plans.  

New high-speed garage doors reduce heating and 

cooling costs; high-efficiency HVAC systems and 

new “intelligent” lighting lower energy use. With new 

skylights the company reduces artificial lighting 

and enhances aesthetics. The company also has 

upgraded its natural gas fueling stations to accom-

modate about 100 new natural gas fueled vehicles it 

will buy over the next few years. These low-emission 

trucks operate on natural gas – at a significant 

savings over gasoline.

Customers capture effi  ciency gains

In 2011, through our energy-effi ciency partnerships 

with Energy Trust of Oregon and our trade allies, 

we helped customers save 4.9 million therms, the 

same amount of natural gas it would take 

to serve 7,600 homes. 

Beyond carbon off sets

Smart Energy, our voluntary customer carbon offset option, supports 

development of biodigesters on Northwest dairy farms, helping 

farmers manage their animal waste and create renewable energy 

by capturing methane from cow manure. In 2011, Smart Energy 

helped the Oak Lea Farm develop an energy-efficient biodigester 

that operates at much lower temperatures than other systems – only 

the second of its type in Oregon. The biogas produced is used to 

generate power for 300 homes.

*Source: 2G-CENERGY ®, biogas power plant manufacturer.

2011 SMART ENERGY STATS

13,726

Number of Smart Energy customers

135,364

Total tons of emission reductions 
Smart Energy customers have funded

24,078

Equivalent reduction expressed in number 
of cars taken off  the road for a year

Investing in clean water 
pays dividends – today and tomorrow

Acknowledging the essential role of clean water 

in supporting a healthy and thriving community, 

NW Natural designated The Freshwater Trust 

last year as our signature philanthropic program. 

The three-year commitment pledges $80,000 per 

year in grants and in-kind donations to further the 

Trust’s work in bringing together landowners and 

governing agencies to restore critical waterways. 

The Trust also supports educational programs that 

promote environmental stewardship.

Smart Energy not only helps customers reduce 
their carbon emissions, but also provides an 
environmentally friendly way to manage animal 
waste while generating renewable energy.

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12

COMPARATIVE CONSOLIDATED INCOME STATEMENTS

Thousands, except per share amounts (year ended December 31) 

2011 

2010 

2009 

2008 

2007 

Operating revenues: 

Gross operating revenues 

$    848,796 

$ 812,106 

$ 1,012,711 

$ 1,037,855 

$ 1,033,193

Cost of sales 

Revenue taxes 

 458,622  

         20,741 

424,534 

19,991 

611,168 

24,656 

656,568 

25,072 

639,150

25,001

  Net operating revenues 

       369,433 

367,581 

376,887 

356,215 

369,042

Operating expenses: 

Operations and maintenance 

General taxes 

Depreciation and amortization 

 125,303 

 29,281 

         70,004 

120,980 

23,872 

65,124 

127,104 

 28,253 

62,814 

113,360 

120,488

26,660 

72,159 

25,288

68,343

  Total operating expenses 

       224,588 

209,976 

218,171 

212,179 

214,119

Income from operations 

 144,845 

157,605  

158,716 

144,036 

154,923

Other income and expense - net 

 4,523 

7,102 

 3,714 

3,746  

1,445

Interest charges - net 

         42,088 

42,578 

40,637  

37,579   

37,811

Income before income taxes 

 107,280 

122,129 

121,793 

110,203 

118,557

Income tax expense 

            43,382 

49,462 

46,671 

40,678   

44,060

Net income 

$       63,898 

$      72,667 

$      75,122 

$      69,525 

$      74,497 

Average common shares outstanding: 

Basic 

Diluted 

Earnings per share of common stock: 

Basic 

Diluted 

 26,687 

 26,744 

26,589  

26,657 

26,511 

26,576 

26,438 

26,594  

26,821

26,995

$   2.39 

$   2.39 

$   2.73 

$   2.73 

$   2.83 

$   2.83 

$   2.63 

$   2.61 

$   2.78

$   2.76

Dividends declared per share of common stock 

$   1.75 

$   1.68 

$   1.60 

$   1.52 

$   1.44

These Financial Statements are condensed. See full Financial Statements and Notes to Consolidated Financial Statements in the company’s Annual Report on 
Form 10-K. 

NET INCOME
(in millions)

TOTAL PLANT AND PROPERTY
(in millions)

$90

80

70

60

50

40

30

2007

2008

2009

2010

2011

Net Income in 2011 was $63.9 million, down $8.8 mil-
lion, primarily due to the repeal of SB 408, a utility tax 
legislative rule in Oregon.

$2,000

1,750

1,500

1,250

1,000

750

500

2007

2008

2009

2010

2011

At the end of 2011, the company’s net investment 
in Plant and Property was $1.9 billion, a 2.1 percent 
increase from 2010.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
COMPARATIVE CONSOLIDATED BALANCE SHEETS

13

Thousands (December 31) 

2011 

2010 

2009 

2008 

2007 

Assets

Plant and property: 

Utility plant 

$ 2,359,518 

$ 2,277,276  

$ 2,216,112 

$ 2,142,988 

$ 2,052,161

Less accumulated depreciation 

      749,603 

710,214 

682,060 

659,123 

615,533

  Utility plant - net 

Non-utility property 

Less accumulated depreciation 

  Non-utility property - net 

  Total plant and property - net 

Current assets: 

Cash and cash equivalents 

Restricted cash 

Accounts receivable 

Accrued unbilled revenue 

Allowance for uncollectible accounts 

Inventories of gas, materials and supplies 

Income taxes receivable 

Other current assets 

  Total current assets* 

Regulatory assets* 

Derivative instruments* 

Gas reserves* 

Other investments 

Other non-current assets 

Total assets 

Capitalization and liabilities

Capitalization:

Common stock equity 

Total long-term debt 

  Total capitalization 

Current liabilities: 

Short-term debt 

Accounts payable 

Current maturities of long-term debt 

Taxes accrued 

Interest accrued 

Other current liabilities 

  Total current liabilities* 

Regulatory liabilities* 

Deferred tax liabilities 

Derivative instruments* 

Other liabilities 

   1,609,915 

1,567,062 

1,534,052 

1,483,865 

1,436,628

301,584 

        17,623 

      283,961 

299,126 

12,025 

287,101 

146,622 

10,540 

136,082 

74,506 

9,314  

65,192  

67,149

7,904

59,245

   1,893,876 

1,854,163 

1,670,134 

1,549,057  

1,495,873

5,833 

– 

77,449 

61,925 

(2,895 ) 

74,363 

7,045 

        22,980 

3,457 

924 

67,969 

64,803 

(2,950 ) 

80,385 

41,066 

19,652 

      246,700 

275,306 

 8,432 

35,543 

77,438 

71,230 

(3,125 ) 

80,957 

– 

21,302 

291,777 

6,916 

4,118 

81,288 

102,688 

(2,927 ) 

96,067 

20,811 

20,098 

329,059 

466,065 

401,611 

346,490 

435,789 

2,853 

51,914 

68,263 

        16,903 

2,873 

– 

69,094 

13,569 

7,347 

– 

67,365 

16,139 

4,738 

– 

54,132 

5,377 

6,107

–

69,442

78,004

(2,890 )

79,944

–

25,569

256,176

193,536

3,227

–

54,070

11,179

$ 2,746,574 

$ 2,616,616 

$ 2,399,252 

$ 2,378,152 

$ 2,014,061

$    714,488 

$    693,101 

$    660,105 

$    628,373 

$    594,751

      641,700 

591,700 

 601,700 

512,000 

512,000

    1,356,188 

1,284,801   

1,261,805  

1,140,373  

1,106,751 

141,600 

257,435 

86,300 

40,000 

10,747 

5,857 

        41,597 

      326,101 

93,243 

10,000 

10,579 

5,182 

35,457 

102,000 

123,729 

35,000 

21,037 

5,435 

39,097 

248,000 

94,422 

– 

12,455 

2,785 

36,467 

143,100

119,731

5,000

13,137

2,827

29,794

411,896 

 326,298 

394,129 

313,589

309,428 

413,209 

63,853 

275,859 

373,409 

55,459 

      277,795 

215,192  

295,250 

300,898 

22,836 

192,165 

248,613 

257,831 

158,381 

178,825  

275,090

206,340

18,587

 93,704

Total capitalization and liabilities 

$ 2,746,574 

$ 2,616,616  

$ 2,399,252 

$ 2,378,152  

 $ 2,014,061

*Current and long-term portions of regulatory assets, regulatory liabilities, gas reserves and derivative instruments are combined for presentation above. 

These Financial Statements are condensed. See full Financial Statements and Notes to Consolidated Financial Statements in the company’s Annual Report 
on Form 10-K.

5636_NarC2.indd   13

4/2/12   8:29 AM

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
14
14

COMPARATIVE FINANCIAL STATISTICS

MARKET PRICE & BOOK VALUE PER SHARE 
(in dollars)

COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL RETURN
(based on $100 invested on 12/31/06)

$60

50

40

30

20

10

0

$250

200

150

100

50

0

$200

175

150

125

100

75

50

25

0

2006

2007

2008

2009

2010

2011

NWN

S&P UTILITIES INDEX

S&P SMALL CAP 600

Total shareholder return (annualized) over the five years 
ending December 31, 2011 was 6.12 percent, compared to 
the Standard & Poor’s (S&P) Electric & Gas Utilities Index of 
a negative 0.41 percent and the S&P Small Cap 600 Index 
rate of 0.74 percent.

2007

2008

2009

2010

2011

YEAR-END BOOK VALUE

YEAR-END MARKET PRICE

HIGH/LOW MARKET PRICE

The market-to-book ratio was 1.8 at year-end 2011.

CAPITAL EXPENDITURE INVESTMENTS
(in millions)

YEAR-END CAPITAL STRUCTURE
(in millions)

$1,750

1,500

1,250

1,000

750

500

250

0

2007

2008

2009

2010

2011

COMMON EQUITY

LONG-TERM DEBT

SHORT-TERM DEBT

Total capitalization at the end of 2011, including short-term debt, 
was $1.5 billion, of which 46.5 percent was common equity.

2007

2008

2009

2010

2011

UTILITY CUSTOMER GROWTH

UTILITY SYSTEM MAINTENANCE

MIST GAS STORAGE

PALOMAR PIPELINE

UTILITY SYSTEM INTEGRITY

GILL RANCH GAS STORAGE

Total investment in capital expenditures during 2011 was 
$99.5 million, of which $94 million was utility related.

5636_NarC2.indd   14

4/2/12   8:29 AM

COMPARATIVE FINANCIAL STATISTICS

15

Common stock 

Ratios at year-end:

  Price/earnings ratio 

  Dividend yield at year-end rate - % 

  Dividend payout - % 

  Consolidated return on average common equity - % 

Per share data ($):

  Basic earnings 

  Diluted earnings 

  Dividends paid 

  Dividend rate at year-end 

  Book value at year-end 

  Market price: 

  High 

  Low 

  Year-end 

  Average 

Number of shares of common stock outstanding (000):

  Year-end 

  Average 

Coverage data 

2011 

2010 

2009 

2008 

2007 

20.1 

3.7 

73.2 

9.1 

2.39 

2.39 

1.75 

1.78 

17.0 

3.7 

61.5 

10.7 

2.73 

2.73 

1.68 

1.74 

15.9 

3.7 

56.5 

11.7 

2.83 

2.83 

1.60 

1.66 

16.8 

3.6 

57.8 

11.4 

2.63 

2.61 

1.52 

1.58 

17.5

3.1

51.8

12.5

2.78

2.76

1.44

1.50

26.70 

25.99 

24.88 

23.71 

22.52

48.98 

39.63 

47.93 

45.39 

50.86 

41.05 

46.47 

46.32 

46.47 

37.71 

45.04 

42.93 

55.23 

36.61 

44.23 

46.38 

52.85

39.79

48.66

46.20

26,756 

26,687 

26,668 

26,589 

26,533 

26,511 

26,501 

26,438 

26,407

26,821

Fixed charges - Securities and Exchange Commission Method 

3.41 

3.73 

3.86 

3.76 

3.92

Cash fl ow data ($000) 

Cash provided by operating activities 

233,462 

126,469  

240,335 

34,721  

183,640 

Cash used in investing activities 

(153,065 ) 

(212,871 ) 

(162,141 ) 

(109,825 ) 

(117,479 )

Plant and property 

Additions ($000) 

Annual depreciation ($000) 

Depreciation rate - % of average depreciable plant † 

Long-term structure at year-end (%) 

(Exclusive of current portion of long-term debt)

Long-term debt* 

Common stock equity 

  Total capital structure 

Effective tax rate 

99,500 

70,004 

2.8 

225,505 

65,124 

2.8 

169,480 

62,814 

2.9 

117,450 

72,159 

3.4 

125,511

68,343

3.4

47.3 

       52.7 

     100.0 

46.1 

53.9 

100.0 

47.7 

52.3 

100.0 

44.9 

55.1 

100.0 

46.3

53.7

100.0

Effective tax rate - % of pretax income 

40 

40 

38 

37 

37

† Includes an amount for accrued removal costs on utility plant investments, which is included in regulatory liabilities on the balance sheet.

* Excludes current portion of long-term debt.

5636_NarC2.indd   15

4/2/12   8:29 AM

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16

COMPARATIVE OPERATING STATISTICS

UTILITY CUSTOMERS AT YEAR-END
(in thousands)

UTILITY GAS SALES AND TRANSPORTATION DELIVERIES
(in millions of therms)

700

650

600

550

500

2007

2008

2009

2010

2011

1,400

1,200

1,000

800

600

400

200

0

2007

2008

2009

2010

2011

We added 5,546 new customers in 2011, and now serve 
679,543 customers.

FIRM SALES

INTERRUPTIBLE SALES

TRANSPORTATION

Gas sales and transportation deliveries in 2011 increased 
9 percent from 2010, due primarily to colder weather.

UTILITY NET OPERATING REVENUES (MARGIN)
(in millions)

UTILITY GAS REVENUES
(by customer class)

4%

4%

2%

1%

29%

60%

$400

350

300

250

200

150

100

50

0

RESIDENTIAL

COMMERCIAL

RESIDENTIAL

COMMERCIAL

INDUSTRIAL

OTHER

2007

2008

2009

2010

2011

INDUSTRIAL FIRM SALES

INDUSTRIAL INTERRUPTIBLE SALES

TRANSPORTATION

OTHER

Revenues from residential, commercial and industrial fi rm sales 
accounted for 93 percent of total gas revenues in 2011.

Utility margin decreased 1 percent from 2010, due primarily to 
regulatory legislation, offset in part by colder weather.

5636_NarC2.indd   16

4/2/12   8:29 AM

COMPARATIVE OPERATING STATISTICS

17

Selected Utility Data 

2011 

2010 

2009 

2008 

2007 

Gas sales and transportation deliveries (000 therms): 

Residential 

Commercial 

Industrial fi rm 

Industrial interruptible 

  Total gas sales 

Transportation 

425,139 

259,675 

37,344 

      59,308 

781,466 

    370,888 

368,682 

230,196 

37,085 

58,387 

694,350 

367,619 

412,867 

255,593 

39,447  

72,525 

780,432 

350,933 

 428,787 

265,531 

47,340 

87,484 

829,142 

431,609  

398,960

249,659

52,340

89,128

 790,087

 424,882

  Total volumes delivered 

 1,152,354 

1,061,969  

 1,131,365  

 1,260,751  

 1,214,969

Operating revenues and cost of sales ($000):

Utility operating revenues:

  Residential 

  Commercial 

Industrial fi rm 

Industrial interruptible 

  Total gas sales revenues 

  Transportation 

  Regulatory adjustment for income taxes paid 

  Other 

  Total utility operating revenues 

Cost of gas sold 

Revenue taxes 

  Utility net operating revenues 

Customer and weather data:

Total customers 

Actual degree days 

Percent colder (warmer) than average 

Average use per customer (therms):

  Residential 

  Commercial 

 492,490 

244,922 

30,455 

      34,961 

 456,174 

227,994  

30,830 

36,164 

 555,844  

 292,697  

41,407  

 62,116  

 566,840  

 298,943  

 46,579  

 68,978  

 555,312

 298,800

 54,567

 74,876

802,828 

751,162 

952,064  

 981,340  

 983,555 

15,419 

(7,162 ) 

      11,134 

822,219 

458,508 

      20,741 

    342,970 

13,833 

7,721 

17,917 

13,635  

5,884 

 21,166  

 14,288  

1,760 

 21,784  

 14,191

 5,996 

 12,228

790,633 

992,749 

 1,019,172  

 1,015,970

424,494   

611,088 

 656,504  

 639,094

19,991  

 24,656  

25,072  

 25,001

 346,148 

  357,005  

  337,596  

  351,875

679,543 

673,997 

667,794 

662,341 

652,012

4,652 

9% 

690 

4,073 

4,171 

(2)% 

616 

3,699 

4,383 

3% 

686 

4,113 

4,576 

7% 

721 

4,300 

4,374

3%

687

4,110

Gas purchases (000 therms) 

805,196 

716,509 

784,982 

829,989 

806,905

Gas purchased cost per therm - net (cents) 

Average sendout cost of gas (cents) 

Maximum day fi rm sendout (000 therms) 

Maximum day total sendout (000 therms) 

Total employees at year-end 

Number of customers served by each operating employee 

56.60 

58.93 

5,178 

6,724 

1,050 

975 

63.07 

61.36 

5,764 

7,252 

1,028 

1,077 

71.96 

78.40 

6,980 

8,339 

1,061 

979 

86.56 

79.21 

6,609 

8,363 

1,133 

932 

75.00

80.89

5,845

7,344

1,141

924

5636_NarC2.indd   17

4/2/12   8:29 AM

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
18

CORPORATE OFFICERS

BACK ROW: Grant Yoshihara, MardiLyn Saathoff, Alex Miller, 
David Williams, Keith White and Stephen Feltz. 

DAVID H. ANDERSON, 50 [2004]
SENIOR VICE PRESIDENT AND CHIEF 
FINANCIAL OFFICER (2004-PRESENT) 

Senior VP and CFO, TXU Gas (2004)
Senior VP, Corporate Controller and Principal 
Accounting Offi cer, TXU Corp. (2003-2004)
VP, Investor Relations and Shareholder
Services, TXU Corp. (1997-2003)

 LEA ANNE DOOLITTLE, 57 [2000]
  SENIOR VICE PRESIDENT (2008-PRESENT)

 Vice President, Human Resources (2000-2007) 
Director of Compensation, Pacifi Corp (1993-2000)

 STEPHEN P. FELTZ, 56 [1982]
 TREASURER AND CONTROLLER 
(1999-PRESENT)

 Assistant Treasurer and Manager, 
General Accounting (1996-1999)

KEY: [Year hired]

  GREGG S. KANTOR, 54 [1996]
PRESIDENT AND CHIEF EXECUTIVE OFFICER 
(2009-PRESENT)

President and Chief Operating Offi cer (2007-2008)
Executive Vice President (2006-2007)
Senior Vice President, Public and Regulatory Affairs (2003-2006)
Vice President, Public Affairs and Communications (1998-2002)

 MARGARET D. KIRKPATRICK, 57 [2005]
  VICE PRESIDENT AND GENERAL COUNSEL 
(2005-PRESENT)

 Partner, Stoel Rives LLP (1991-2005)

 C. ALEX MILLER, 54 [2002]
VICE PRESIDENT, FINANCE 
AND REGULATION (2009-PRESENT)
ASSISTANT TREASURER (2008-PRESENT)

 Director, Rates and Regulatory Affairs (2002-2009)

MARDILYN SAATHOFF, 55 [2008]
CHIEF GOVERNANCE OFFICER, DEPUTY GENERAL 
COUNSEL AND CORPORATE SECRETARY (2008-PRESENT)

 Chief Compliance Offi cer and Assistant General Counsel, 
Tektronix, Inc. (2005-2008)
General Counsel to Oregon Governor Kulongoski and 
Business and Economic Development Advisor (2003-2005)

FRONT ROW: Margaret Kirkpatrick, David Anderson, 
Gregg Kantor and Lea Anne Doolittle.

J. KEITH WHITE, 59 [1996]
VICE PRESIDENT, BUSINESS 
DEVELOPMENT AND ENERGY 
SUPPLY AND CHIEF STRATEGIC 
OFFICER (2007-PRESENT)

Managing Director, Gas Operations and 
Wholesale Services (2005-2006)
Managing Director and Chief Strategic Offi cer 
(2003-2005)

DAVID R. WILLIAMS, 59 [1978]
 VICE PRESIDENT, UTILITY SERVICES 
(2007-PRESENT)

 Director, Utility Operations (2006-2007)
Director, Districts and Labor Relations (2004-2006)
General Manager, Utility Operations (1999-2004)

GRANT M. YOSHIHARA, 57 [1991]
 VICE PRESIDENT, UTILITY OPERATIONS 
(2007-PRESENT)

Managing Director, Utility Services (2005-2006)
Director, Utility Services (2004-2005)
General Manager, Consumer Services (2003-2004)

5636_NarC2.indd   18

4/2/12   8:29 AM

BOARD OF DIRECTORS

19

 TIMOTHY P. BOYLE, 62
[2003] (4) (5)
 President and 
Chief Executive Offi cer
Columbia Sportswear Company 
Portland, Oregon

 JOHN D. CARTER, 66
[2002] (1) (2) (6)
Chairman of the Board 
Schnitzer Steel Industries, Inc. 
Portland, Oregon

 C. SCOTT GIBSON, 59
[2002] (1) (3) (4)
 President 
Gibson Enterprises
Jackson Hole, Wyoming

GREGG S. KANTOR, 54
[2009]
 President and 
Chief Executive Offi cer 
NW Natural
Portland, Oregon

GEORGE J. PUENTES, 64
[2007] (4) (6)
  Former President
Don Pancho Authentic 
Mexican Foods, Inc. 
Salem, Oregon

KENNETH THRASHER, 62
[2005] (2) (3) (4)
 Chairman of the Board 
Compli Corporation
Portland, Oregon

MARTHA L. “STORMY” 
BYORUM, 63
[2004] (2) (6)
 Senior Managing Director 
Stephens Cori Capital Advisors
New York, New York

MARK S. DODSON, 67
[2003] (4) (5)
Former Chief Executive Offi cer 
NW Natural
Vancouver, Washington

TOD R. HAMACHEK, 66
[1986] (1) (2) (5)
  Former Chairman and 
Chief Executive Offi cer 
Penwest Pharmaceuticals Company
Danbury, Connecticut

JANE L. PEVERETT, 53
[2007] (2) (3) (5)
 Former President and 
Chief Executive Offi cer 
British Columbia Transmission Corporation
Vancouver, British Columbia

RUSSELL F. TROMLEY, 72
[1994] (1) (2) (3)
 Chairman of the Board and
Chief Executive Offi cer
Tromley Industrial Holdings, Inc.
Tualatin, Oregon and
Chairman of the Board, NW Natural 
Portland, Oregon

KEY: [Year elected to the board], (1) Governance Committee, 
(2) Audit Committee, (3) Organization and Executive Compensation 
Committee, (4) Public Affairs and Environmental Policy Committee, 
(5) Strategic Planning Committee, (6) Finance Committee

5636_NarC2.indd   19

4/2/12   8:29 AM

20

QUARTERLY FINANCIAL INFORMATION

Quarterly Financial Information (unaudited) 

  Quarter Ended

(thousands except per share amounts) 

March 31 

June 30 

Sept. 30 

Dec. 31 

Total

2011

Gross operating revenues 

Net operating revenues 

Net income (loss) 

Basic earnings (loss) per share 

Diluted earnings (loss) per share 

2010

Gross operating revenues 

Net operating revenues 

Net income (loss) 

Basic earnings (loss) per share 

Diluted earnings (loss) per share 

 $323,088 

 $161,197 

 $93,313 

 $271,198 

 $848,796

  134,508  

  40,773  

  1.53  

  1.53  

 67,232  

 2,193  

 0.08  

 0.08  

 47,783  

 (8,312 ) 

 (0.31 ) 

 (0.31 ) 

 119,910  

 369,433 

29,244  

 63,898  

1.09  

1.09  

 2.39 *

2.39 *

 $286,529 

 $162,365 

 $95,067 

 $268,145 

 $812,106

 130,926  

 43,608  

 1.64  

 1.64 

 72,193  

 46,211  

 118,251  

 367,581

6,888 

 0.26  

 0.26  

 (7,420)   

29,591 

 72,667 

 (0.28)  

 (0.28)  

1.11  

1.11  

2.73 *

 2.73 *

* Quarterly earnings (loss) per share are based upon the average number of common shares outstanding during each quarter. Because the average number of 
shares outstanding has changed in each quarter shown, the sum of quarterly earnings may not equal earnings per share for the year. Variations in earnings 
between quarterly periods are due primarily to the seasonal nature of our business.

Common Stock Prices

NW Natural’s common stock is listed and trades on the New York Stock Exchange under the symbol “NWN.” 

The quarterly high and low trading range during 2011 and 2010 was:

2011

Quarter Ended 

High 

Low 

Close

March 31 

June 30 

September 30 

December 31 

2010

  $48.72  

 $43.92  

 $46.13

  46.40  

  46.77  

  48.98  

 43.57  

 39.63  

 42.52  

 45.13

 44.10

 47.93 

Quarter Ended 

High 

Low 

Close

March 31 

June 30 

September 30 

December 31 

 $47.54  

 $41.05 

$46.60

 49.18  

 49.00  

 50.86  

 41.90 

 42.63 

 44.02 

43.57

47.45

46.47 

5636_NarC2.indd   20

4/2/12   8:30 AM

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SHAREHOLDER INFORMATION

21

Notice of annual meeting

 The 2012 Annual Meeting will be held at 2 p.m., Thursday, May 24, at the Oregon Convention Center, 777 NE Martin Luther King Jr. Blvd., 

Portland, Oregon 97232. A meeting notice and proxy statement will be sent to all shareholders in April. If you plan to attend the annual meeting, 

you will need to detach and retain the admission ticket attached to your proxy card mailed to you with the notice of the annual meeting and 

the proxy statement. As space is limited, you may bring only one guest to the meeting. If you hold your stock through a broker, bank, or other 

nominee, please bring evidence to the meeting that you owned NW Natural Common Stock as of the record date, April 5, 2012, and we will 

provide you with an admission ticket. A form of government-issued photograph identifi cation will be required to enter the meeting. 

Dividend reinvestment 
and direct stock purchase plan

Forward-looking statements

Request for publications

The statements made in this Annual 

 The following publications may be obtained 

Participants may make an initial investment 

Report that are not purely historical, 

without charge by contacting the Corporate 

in company stock and common sharehold-

including statements regarding strategy, 

Secretary at NW Natural’s address: Annual 

ers of record may reinvest all or part of their 

growth, future demand for gas, commod-

Report; Form 10-K; Form 10-Q; Corporate 

dividends in additional shares under the 

ity costs, revenues, gas supplies and 

Governance Standards; Director Indepen-

company’s plan. Cash purchases may also 

reserves, investment returns, business 

dence Standards; Code of Ethics; and 

be made. Participants in the plan bear the 

development, project timelines, pipeline 

Board Committee Charters. These publica-

cost of brokerage fees and commissions 

development, replacement and safety 

tions, as well as other fi lings made with the 

for shares purchased on the open market 

programs, system reliability, storage 

SEC, are also available on our website at 

to fulfi ll purchases under the plan. A pro-

performance and storage values, cost 

nwnatural.com. Our SEC filings are also 

spectus will be sent upon request. 

management, pension deferrals, tax 

available in the public reference room of 

Scheduled dividend payment dates

tion and regulatory actions, economic 

DC 20549, by calling (800) 732-0330, or 

estimates, governmental policy legisla-

the SEC at 100 F Street NE, Washington, 

   February 15, 2012

May 15, 2012

August 15, 2012

November 15, 2012

 Certifi cations

 The Chief Executive Offi cer certifi ed to the 

NYSE on June 15, 2011 that, as of that 

date, he was not aware of any violation by 

the company of NYSE’s corporate gover-

nance listing standards, and the company 

had fi led with the Securities and Exchange 

Commission (SEC), as exhibits 31.1 and 

31.2 to its Annual Report on Form 10-K 

for the year ended December 31, 2010, 

the certificates of the Chief Executive 

Offi cer and the Chief Financial Offi cer of 

the company certifying the quality of the 

company’s public disclosure. For the year 

ended December 31, 2011, the certifi cates 

of the Chief Executive Officer and Chief 

Financial Offi cer are attached as exhibits 
31.1 and 31.2 to the Form 10-K included 

in this Annual Report.  

Contact the NW Natural board 

Concerns may be directed to the non-

management directors by writing to 

NW Natural Board of Directors, 

c/o Corporate Secretary.

factors and the competitive environment 

by accessing the SEC website at sec.gov.

are forward-looking statements within the 

“safe harbor” provisions of the Private 

Securities Litigation Reform Act of 1995. 

NW Natural’s actual results could differ 

materially from those anticipated in these 

forward-looking statements as a result of 

risks and uncertainties, including those 

described in the attached report on Form 

10-K. For a more complete description 

of these risks and uncertainties, please 
refer to our filings with the SEC on 

Forms 10-K and 10-Q.

 Investor & shareholder information

Robert S. Hess

Investor Relations

(800) 422-4012, Ext. 2388

rsh@nwnatural.com

Chu Lee

Shareholder Services

(800) 422-4012, Ext. 3412

c4l@nwnatural.com

STOCK TRANSFER AGENT 
AND REGISTRAR
For the common stock:
American Stock Transfer & Trust Company

6201 15th Avenue

Brooklyn, NY 11219

(888) 777-0321

web: amstock.com

email: info@amstock.com

TRUSTEE AND BOND PAYING AGENT 
For all bond issues:
Deutsche Bank Trust Company Americas

60 Wall Street

New York, NY 10005

(800) 735-7777

220 NW Second Avenue, Portland, OR 97209

(503) 226-4211 or toll-free (800) 422-4012

nwnatural.com

NYSE: NWN

5636_NarC2.indd   21

4/2/12   8:30 AM

22

OUR MISSION & VALUES

OUR MISSION:
We provide safe, reliable 
and affordable energy  
in an environmentally responsible way 
to better the lives 
of the public we serve.

OUR CORE VALUES:

INTEGRITY
Safety  
Service Ethic  
CARING
Environmental Stewardship   

5636_NarC2.indd   22

4/2/12   8:30 AM

Form 10-K
Annual Report

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K

(Mark One)
[X]

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2011
OR

[

]

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from

to
Commission file number 1-15973

NORTHWEST NATURAL GAS COMPANY
(Exact name of registrant as specified in its charter)

Oregon
(State or other jurisdiction of
incorporation or organization)

93-0256722
(I.R.S. Employer
Identification No.)

220 N.W. Second Avenue, Portland, Oregon 97209
(Address of principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (503) 226-4211

Securities registered pursuant to Section 12(b) of the Act:
Title of each class
Common Stock
Securities registered pursuant to Section 12(g) of the Act: None.

Name of each exchange on which registered
New York Stock Exchange

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

Act. Yes [ X ] No [

]

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

Act. Yes [

] No [ X ]

Indicate by check mark whether the registrant (1) has 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) has been subject to such filing requirements for the past 90 days. Yes [ X ] No [

]

Indicate by check mark whether the 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 (§232.405 of this
chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files). Yes [ X ] No [

]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405) is not

contained herein, and will not be contained, to the best of 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. [ X ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or

a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting
company” in Rule 12b-2 of the Exchange Act. (Check one):
Large Accelerated Filer [ X ]
Non-accelerated filer [

Accelerated Filer [
Smaller Reporting Company [

]

]

]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange

Act). Yes [

] No [ X ]

As of June 30, 2011, the registrant had 26,672,812 shares of its 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 non-affiliates was $1,189,774,420.

At February 24, 2012, 26,791,793 shares of the registrant’s Common Stock (the only class of Common Stock) were

outstanding.

Portions of the Proxy Statement of the registrant, to be filed in connection with the 2012 Annual Meeting of

Shareholders, are incorporated by reference in Part III.

DOCUMENTS INCORPORATED BY REFERENCE

NORTHWEST NATURAL GAS COMPANY
Annual Report to Securities and Exchange Commission
on Form 10-K
For the Fiscal Year Ended December 31, 2011
Table of Contents

PART I

Item 1.

Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forward-Looking Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Business . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Business Segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Gas Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Employees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additions to Infrastructure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Executive Officers of the Registrant
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Available Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 1A. Risk Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 1B. Unresolved Staff Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 2.
Legal Proceedings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 3.
Mine Safety Disclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 4.

PART II
Item 5.

Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer

Purchases of Equity Securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selected Financial Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 6.
Item 7.
Management’s Discussion and Analysis of Financial Condition and Results of Operations . . .
Item 7A. Quantitative and Qualitative Disclosures About Market Risk . . . . . . . . . . . . . . . . . . . . . . . . . . .
Financial Statements and Supplementary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 8.
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure . . .
Item 9.
Item 9A. Controls and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 9B. Other Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PART III
Item 10.
Item 11.
Item 12.

Item 13.
Item 14.

Directors, Executive Officers and Corporate Governance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Executive Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder

Matters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certain Relationships and Related Transactions, and Director Independence . . . . . . . . . . . . . .
Principal Accountant Fees and Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Page
1
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40
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132
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133
134

134
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135

136
137

GLOSSARY OF TERMS

Average weather: equal to the 25-year average
degree days based on temperatures established
in our last Oregon general rate case.

Bcf: one billion cubic feet, a volumetric measure
of natural gas, roughly equal to 10 million
therms or one trillion Btu’s.

Btu: British thermal unit, a basic unit of thermal
energy measurement. One Btu equals the energy
required to raise one pound of water one degree
Fahrenheit at atmospheric pressure and 60
degrees Fahrenheit. One hundred thousand Btu’s
equal one therm.

Core utility customers: residential, commercial
and industrial customers receiving firm service
from the utility.

Cost of gas sold: the delivered cost of natural
gas sold to customers, including the cost of gas
purchased or withdrawn/produced from storage
inventory or reserves, gains and losses from gas
commodity hedges, pipeline demand costs,
seasonal demand cost balancing adjustments,
regulatory gas cost deferrals and company gas
use.

Decoupling: a rate mechanism, also referred to
as our conservation tariff, which is designed to
break the link between earnings and the quantity
of natural gas consumed by customers. The
design is intended to allow the utility to
encourage customers to conserve energy while
not adversely affecting its earnings due to
reductions in sales volumes.

Degree days: units of measure that reflect
temperature-sensitive consumption of natural
gas, calculated by subtracting the average of a
day’s high and low temperatures from 65
degrees Fahrenheit.

Demand cost: a component in core utility
customer rates that covers the cost of securing
firm pipeline capacity to meet peak demand,
whether that capacity is used or not.

Firm service: natural gas service offered to
customers under contracts or rate schedules that
will not be disrupted to meet the needs of other
customers, particularly during cold weather.

General rate case: a periodic filing with state or
federal regulators to establish equitable rates and

balance the interests of all classes of customers
and our shareholders.

Interruptible service: natural gas service
offered to customers (usually large commercial
or industrial users) under contracts or rate
schedules that allow for interruptions when
necessary to meet the needs of firm service
customers.

Liquefied natural gas (LNG): the cryogenic
liquid form of natural gas. To reach a liquid
form at atmospheric pressure, natural gas must
be cooled to approximately -260 degrees
Fahrenheit.

Purchased gas adjustment (PGA): a regulatory
mechanism for adjusting customer rates to
reflect changes in the expected cost to acquire
and deliver natural gas supplies.

Return on equity (ROE): a measure of
corporate profitability, calculated as net income
divided by average common stock
equity. Authorized ROE refers to the equity rate
approved by a regulatory agency for utility
investments funded by common stock equity.

Sales service: service provided whereby a
customer purchases both natural gas commodity
supply and transportation from the utility.

Therm: the basic unit of natural gas
measurement, equal to 100,000 Btu’s.

Transportation service: service provided
whereby a customer purchases natural gas
commodity directly from a supplier but pays the
utility to transport the gas over its distribution
system to the customer’s facility.

Utility margin: utility gross revenues less the
associated cost of gas sold, including regulatory
adjustments and applicable revenue taxes. Also
referred to as utility net operating revenues.

Weather normalization: a rate mechanism
applied to residential and commercial
customers’ bills to adjust residential and
commercial customer billings based on
temperature variances from average weather,
with rate decreases when the weather is colder
than average and rate increases when the
weather is warmer than average.

1

Forward-Looking Statements

This report contains “forward-looking statements” within the meaning of the U.S. Private
Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such
as “anticipates,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects” and similar references
to future periods. Examples of forward-looking statements include, but are not limited to statements
regarding the following:

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

plans;
objectives;
goals;
strategies;
assumptions and estimates;
future events or performance;
trends;
cyclicality;
earnings and dividends;
growth;
customer rates;
commodity costs;
gas reserves;
operational performance and costs;
liquidity and financial positions;
project development and expansion;
competition;
procurement and development of new gas supplies;
estimated expenditures;
costs of compliance;
credit exposures;
potential efficiencies;
rate case;
impacts of laws, rules and regulations;
tax liabilities or refunds;
outcomes and effects of litigation, regulatory actions, and other administrative matters;
projected obligations under retirement plans;
adequacy of, and shift in mix of, gas supplies;
approval and adequacy of regulatory deferrals; and
environmental, regulatory, litigation and insurance costs and recoveries.

Forward-looking statements are based on our current expectations and assumptions regarding our

business, the economy and other future conditions. Because forward-looking statements relate to the
future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to
predict. Our actual results may differ materially from those contemplated by the forward-looking
statements. We therefore caution you against relying on any of these forward-looking statements. They
are neither statements of historical fact nor guarantees or assurances of future performance. Important
factors that could cause actual results to differ materially from those in the forward-looking statements
are discussed at Item 1A., “Risk Factors” of Part I and Item 7. and Item 7A., “Management’s Discussion
and Analysis of Financial Condition and Results of Operations” and “Quantitative and Qualitative
Disclosures About Market Risk,” respectively, of Part II of this report.

Any forward-looking statement made by us in this report speaks only as of the date on which it

is made. Factors or events that could cause our actual results to differ may emerge from time to time,
and it is not possible for us to predict all of them. We undertake no obligation to publicly update any
forward-looking statement, whether as a result of new information, future developments or otherwise,
except as may be required by law.

2

NORTHWEST NATURAL GAS COMPANY
PART I

ITEM 1. BUSINESS

Overview

Northwest Natural Gas Company (NW Natural) was incorporated under the laws of Oregon in

1910. Our company and its predecessors have supplied gas service to the public since 1859, and we
have been doing business as NW Natural since 1997. We maintain operations in Oregon, Washington
and California and conduct businesses through NW Natural, its subsidiaries and joint ventures. A
reference to NW Natural (“we,” “us” or “our”) in this report means NW Natural and its subsidiaries
and joint ventures unless otherwise noted.

Business Segments

We operate in two primary reportable business segments, Local Gas Distribution and Gas
Storage. We also have other investments and business activities not specifically related to one of these
two reporting segments that we aggregate and report as Other.

Local Gas Distribution

We are principally engaged in the distribution of natural gas in Oregon and southwest
Washington. We refer to this business segment as our local gas distribution segment or utility. Our
local gas distribution segment involves building and maintaining a safe and reliable pipeline
distribution system, purchasing gas from producers and marketers, contracting for the transportation of
gas over pipelines from regional supply basins to our service territory, and reselling the gas to
customers subject to rates, terms and conditions approved by the Public Utility Commission of Oregon
(OPUC) or by the Washington Utilities and Transportation Commission (WUTC). Local gas
distribution also includes transporting gas owned by customers from an interstate pipeline connection,
or city gate, to the customers’ facilities for a fee, also approved by the OPUC or WUTC.
Approximately 90 percent of our consolidated assets and consolidated net income have been related to
the local gas distribution segment over the last few years. The OPUC has allocated to us as our
exclusive service area a major portion of western Oregon, including the Portland metropolitan area,
most of the Willamette Valley and the coastal area from Astoria to Coos Bay. We also hold certificates
from the WUTC granting us exclusive rights to serve portions of three southwest Washington counties
bordering the Columbia River. We provide gas service in 124 cities and neighboring communities in
15 Oregon counties, as well as in 16 cities and neighboring communities in three Washington
counties. The city of Portland is the principal retail and manufacturing center in the Columbia River
Basin, and is a major port for trade with Asia.

See Note 4 to the Consolidated Financial Statements for information on local gas distribution

assets and results of operations for the years ended December 31, 2011, 2010 and 2009.

Regulation and Rates

Our utility segment is subject to regulation with respect to, among other matters, rates and

systems of accounts by the OPUC, the WUTC, and Federal Energy Regulatory Commission (FERC).
The OPUC and WUTC also regulate NW Natural’s issuance of securities. In 2011, approximately 90
percent of our utility gas volumes were delivered to, and utility operating revenues were derived from,

3

Oregon customers and the balance from Washington customers. The OPUC and the WUTC generally
require the natural gas commodity cost to be billed to customers at the same cost incurred or expected
to be incurred by the utility. We have not historically earned a profit or incurred a loss on gas
commodity purchases; however, in Oregon we have an incentive sharing provision whereby we can
either increase or decrease margin revenues from gas cost variances as compared to gas costs
embedded in the PGA. Under this provision, our net income is affected by differences between actual
and expected purchased gas costs, which occur primarily because of market fluctuations and volatility
affecting unhedged gas purchases. In addition, we recently entered into a regulatory agreement where
we receive a rate base return on our investment in gas reserves. See Part II, Item 7., “Results of
Operations—Regulatory Matters—Rate Mechanisms—Purchased Gas Adjustment and Results of
Operations—Regulatory Matters—Rate Mechanisms—Gas Reserves”.

We file general rate case and rate tariff requests periodically with the OPUC, WUTC and FERC

to change the rates we charge our utility and storage customers. On December 30, 2011, we filed an
application for a general rate increase at the OPUC. We requested an increase in authorized annual
Oregon jurisdictional revenues of $43.7 million, or 6.2 percent, with an overall rate of return on capital
of 8.28 percent, including a return on common equity of 10.3 percent, and an authorized equity to
capitalization ratio of 50 percent. We also requested the establishment of a rate mechanism through
which deferred costs related to our environmental liabilities will be recovered through rates. The new
rates are requested to be effective by November 1, 2012. We expect the OPUC to make a decision on
this rate case by the end of October 2012.

Our most recent general rate case in Washington was approved in December 2008, and new

rates were effective on January 1, 2009 (see Part II, Item 7., “Results of Operations—Regulatory
Matters—General Rate Cases,” below).

We are required under our Mist interstate storage certificate authority to file with FERC every

five years either a petition for rate approval or a cost and revenue study to change or justify
maintaining the existing rates for the interstate storage service. For further information, see Part II,
Item 7., “Results of Operations—Regulatory Matters,” and “Business Segments—Gas Storage,”
below.

Gas Supply

Our gas supply strategy is based on forecasted customer requirements, which considers

estimated load growth by type of customer, attrition, conservation, distribution system constraints,
interstate pipeline capacity and contractual limitations and the forecasted transfer of large customers
between sales service and transportation-only service. We perform sensitivity analyses based on factors
such as weather variations and price elasticity effects. We have a diverse portfolio of short-, medium-
and long-term firm gas supply contracts that are supplemented during periods of peak demand with gas
from storage facilities either owned by or contractually committed to us.

To achieve our gas supply strategy, we employ a gas purchasing strategy that emphasizes a
diversity of supply sources; a diverse portfolio of contract types and durations; strategic uses of gas
storage facilities and capacity recall agreements; a variety of gas cost management strategies; and
physical acquisition of gas supplies.

4

We purchase our gas supplies at liquid trading points to facilitate competition and price
transparency. These trading points include the NOVA Inventory Transfer (NIT) point in Alberta (also
referred to as AECO), Huntingdon/Sumas and Station 2 in British Columbia, and multiple receipt
points in the U.S. Rocky Mountains.

Diversity of Supply Sources

We purchase natural gas for our core utility customers from three supply basins located

between western Canada and the U.S. Rocky Mountain areas. Currently, about 65 percent of our
supply comes from Canada, with the balance coming primarily from the U.S. Rocky Mountain
region. We believe that gas supplies available in the western United States and Canada are adequate to
serve our core utility requirements for the foreseeable future, but we continue to evaluate our long-term
supply mix based on projections of gas production and pricing in the U.S. Rocky Mountain regions as
well as other regions in North America. We believe that the cost of natural gas coming from western
Canada and the U.S. Rocky Mountain regions will continue to track the broader U.S. market prices.
Additionally, we expect increased availability of gas supplies throughout North America as a result of
the extraction of shale gas resources and the building of new transmission pipeline projects to increase
capacity out of the U.S. Rocky Mountain region.

Diverse Supply Portfolio of Contract Types and Durations

We maintain a diverse portfolio of short-, medium-, and long-term firm gas supply contracts.

We typically enter into gas purchase contracts for:

year-round baseload supply;
additional baseload supply for the winter heating season;

•
•
• winter heating season contracts where we have the option to call on all or some of the

•

supplies on a daily basis; and
spot purchases, taking into account forecasted customer requirements, storage injections
and withdrawals and seasonal weather fluctuations.

At December 31, 2011, we have contracts with gas suppliers for deliveries ranging from three
months to four years, which provide for a maximum of 2.0 million therms of firm gas per day during
the winter heating season and 0.7 million therms per day year-round. These contracts have a variety of
pricing structures and purchase obligations. In addition, we have another 1.3 million therms per day of
firm gas supplies whereby we can purchase supplies for delivery to our system during the winter
heating season. During 2011, we purchased a total of 808 million therms of gas under contracts with
durations outlined in the chart below.

Contract Duration (primary term)

Percent of Purchases

Long-term (one year or longer)
Short-term (more than one month, less than one year)
Spot (one month or less)

Total

29
26
45

100

We typically renew or replace our gas supply contracts with new agreements from existing and

new suppliers. Aside from the asset management of our core utility gas supplies by the independent

5

energy marketing company (see “Gas Cost Management Strategy—Asset management,” below), no
individual supplier generally provides more than 10 percent of our supply requirements. In 2011, one
supplier provided 11 percent of our supply requirements. Firm year-round supply contracts have
remaining terms ranging from one to four years. Currently, all firm gas supply contracts use price
formulas tied to monthly index prices.

In addition to our year-round contracts, we continue to contract in advance for firm gas supplies

to be delivered only during the winter heating season primarily under short-term contracts. During
2011, new short-term purchase contracts were entered into with 17 suppliers, which in addition to our
year- round contracts provide for a total of up to 2.0 million therms per day. We intend to enter into
new purchase contracts during 2012 for roughly the same volume of gas with existing or new
suppliers, as needed, to replace contracts that will expire in 2012.

We also buy gas on the spot market as needed to meet utility customer demand. We have
flexibility under the terms of some firm supply contracts, to purchase spot gas in lieu of the firm
contract volumes thereby allowing us to take advantage of more favorable pricing on the spot market
from time to time.

We continue to purchase a small amount of gas from a non-affiliated producer in the Mist gas

field in Oregon. The production area is situated near our underground gas storage facilities. Current
production supplies are less than 2 percent of our total annual purchase requirements. Production from
these wells varies as existing wells are depleted and new wells are drilled.

In 2011, we entered into an agreement with Encana Oil & Gas (USA) Inc. (Encana) to develop
physical gas reserves that are expected to supply a portion of our utility customers’ requirements over
the next 30 years. The volume of gas produced and allocated to us under the agreement will increase in
the early years as we continue to invest in drilling, with volumes expected to peak at about 13 percent
of our utility’s gas supply requirement in gas year 2015-2016. Over the first 10 years of the agreement
(2011-2020), volumes are expected to average approximately 8 to 10 percent of the annual gas
purchase requirements of our utility customers. In 2011, volumes from gas reserves were less than one
percent of our annual gas purchases.

Strategic Use of Gas Storage and Capacity Recall

We supplement our firm gas supply purchases with gas withdrawals from storage facilities we

own or that are contractually committed to us. Gas is generally purchased and injected into storage
during periods of low demand so that it can be withdrawn for use at a later time during periods of peak
demand. In addition to enabling us to meet our peak demand, these facilities make it possible to lower
the annual average cost of gas by allowing us to minimize our pipeline capacity demand costs and to
purchase gas for storage during the summer months when gas prices are generally lower.

Underground storage. A portion of our daily and seasonal peaking supplies to core utility

customers are from our underground gas storage facility in the Mist gas storage field. This facility has
a maximum daily deliverability of 5.2 million therms and a total working gas capacity of about 16 Bcf,
which includes the capacity reserved for core utility customers as well as the capacity used for
non-utility service. Under our regulatory agreement with the OPUC, non-utility gas storage at Mist can
be developed in advance of core utility customer needs, but it is subject to recall by the utility when
needed to serve utility customers as utility demand increases. Storage capacity recalled by the utility is

6

added to utility rate base at net book value and tracked into utility rates in the annual PGA filing
immediately following the recall, so there is minimal regulatory lag in cost recovery. In May 2011, a
total of 100,000 therms per day of Mist storage capacity that had previously been available for
non-utility gas storage services was recalled and committed to use for core utility customers. There
was no Mist recall in 2010, but 100,000 therms per day were recalled in May 2009. The core utility
currently has 2.6 million therms per day of deliverability and approximately 9.5 Bcf of working gas
capacity available at the Mist storage facility.

We also have contracts with Northwest Pipeline (Northwest Pipeline), a subsidiary of The

Williams Companies, for firm gas storage from an underground facility at Jackson Prairie near
Chehalis, Washington, that provides us with daily firm deliverability of about 0.5 million therms and
total seasonal capacity of about 11.2 million therms. Separate contracts with Northwest Pipeline
provide for the transportation of these storage supplies to our service territory. All of these contracts
have reached the end of their primary terms, but we have exercised our renewal rights that allow for
annual extensions at our option.

We also contract for storage service in Alberta for amounts totaling just under 20 million

therms. This supply will displace equivalent volumes of spot purchases in Alberta as it uses the same
pipeline transportation for delivery from Alberta to our local gas distribution system. While this supply
helps manage price risks, it does not add to our total peak day resources.

LNG storage. We own and operate two LNG storage facilities in our Oregon service territory

that liquefy gas for storage during the summer months so that it is available for withdrawal during
periods of peak demand in the winter heating season. These two facilities provide a maximum
combined daily deliverability of 1.8 million therms and a total seasonal capacity of 16 million therms.
In addition, we have a contract for firm gas storage from an LNG facility in Plymouth, Washington,
which provides us with daily firm deliverability of about 0.6 million therms and total seasonal capacity
of about 4.8 million therms.

Capacity recall from transportation customers. We also have contracts with one electric
generator and two industrial customers that together provide 390,000 therms per day of recallable
pipeline capacity and supply.

Gas Cost Management Strategy

The cost of gas sold to core utility customers primarily consists of the purchase price paid to
suppliers (including the cost to acquire supplies in the form of gas reserves), charges paid to pipeline
companies to store and transport gas to our distribution system, and gains or losses related to gas
commodity hedge contracts entered into in connection with the purchase of gas for core utility
customers.

While volatility in natural gas commodity prices has ebbed and flowed over the last several

years due to a number of factors, recent success in new drilling technologies and substantial new
supplies from shale gas formations around the U.S. and Canada have resulted in increased North
American supplies of natural gas and lower gas prices. At the same time, pipeline transportation rates
charged by Canadian pipelines and U.S. interstate pipeline transportation service providers have been
relatively stable over the last several years, due in part to a 2006 rate case settlement for the U.S.
interstate pipelines. These rates periodically change when the Canadian pipelines and U.S. interstate

7

pipelines file for rate change approval from the Canadian National Energy Board or FERC, as
applicable. Pipeline transportation rate increases or decreases are generally passed on to our customers
through annual PGA updates.

We engage in a number of strategies to mitigate the cost of gas sold to utility customers. Our

primary strategies for managing gas commodity price risk include:

•
•

•

•
•
•

negotiating fixed prices directly with gas suppliers;
negotiating financial derivative instruments that effectively convert the floating index price
in a physical gas supply contract to a fixed price (referred to as commodity price swaps);
negotiating financial derivative instruments that effectively set a ceiling or floor price, or
both, on a floating price physical supply contract (referred to as commodity price options
such as calls, puts, and collars);
buying gas and injecting it into storage;
buying a physical supply of gas reserves for longer term price stability; and
using an asset management service provider to produce revenues that reduce our utility’s
net cost of gas sold;

Fixed-price contracts. We negotiate fixed price contracts directly with gas suppliers for a
portion of our gas purchases. When we enter into these fixed-price contracts with our suppliers, the
price is typically set based on the prevailing index price plus or minus a spread based on the forward
price curve of natural gas at that time.

Financial derivative instruments. We hedge a majority of our firm year-round supply
contracts each year using financial derivative instruments as a key component of our gas purchasing
strategy. Our financial hedge contracts make up a majority of our commodity price hedging activity,
and these contracts are with a variety of investment-grade credit counterparties, typically with credit
ratings of AA- or higher. See Part II, Item 7A., “Quantitative and Qualitative Disclosures About
Market Risk—Credit Risk—Credit exposure to financial derivative counterparties.” Under our
financial hedge policy, we enter into commodity swaps, puts, calls and collars with terms generally
ranging anywhere from one month to five years.

Storage supplies. We seek to mitigate the effects of higher gas commodity prices and price

volatility on core utility customers by using our underground gas storage facilities, LNG facilities and
other methods of gas storage strategically in an attempt to manage the cost of gas commodity
purchases. We purchase and inject gas into storage during the summer months when demand and gas
prices are generally lower. About 19 percent of our annual gas supply requirements is stored for
withdrawal during the winter months in five different market-area storage facilities and one contract
for supply-basin storage. We are able to draw on these supplies during peak demand, thereby reducing
the need for higher-priced spot gas purchases.

Gas reserves. In addition to hedging gas prices with financial derivative instruments and gas

storage, we recently signed an agreement with Encana to acquire physical gas supplies to provide a
portion of our core utility customers’ requirements over 30 years. During the first 10 years of the
agreement, we believe the volumes of gas received under the Encana agreement will provide
approximately 8 to 10 percent of the average annual requirements of our utility customers.

Asset management. We use our gas supply, storage and transportation flexibility to capture
opportunities that emerge during the course of the year for gas purchases, sales, exchanges or other

8

means to manage net gas costs. In particular, our Mist underground storage facility provides flexibility
in this regard. In addition to maximizing the value of our gas storage and pipeline capacity, we contract
with an independent energy marketing company that manages our unused capacity when those assets
are not serving the needs of our core utility customers. Our asset management provides cost savings
that reduces our utility’s cost of gas sold, and generates incremental revenues from a regulatory
incentive-sharing mechanism that are included in our gas storage business segment.

Gas Distribution Operations

The goals of our gas distribution operations for core utility customers are:

Safety—Building and maintaining a safe pipeline distribution system;

•
• Reliability—Ensuring a gas resource portfolio that is sufficient to satisfy core utility

customer requirements under extremely cold weather conditions;

• Lowest reasonable cost—Applying strategies to acquire gas supplies at the lowest

reasonable cost for utility customers;

• Price stability—Making the best use of physical assets and financial instruments to manage

commodity price volatility; and

• Cost recovery—Managing gas purchase costs prudently to minimize the risks associated

with regulatory review and recovery of gas acquisition costs.

Safety

Safety and protection of our employees, our customers and the public at large is and will
remain a top priority. We monitor and maintain our pipeline distribution system and storage operations
with the goal of ensuring that natural gas is stored and delivered safely, reliably and efficiently. We
have had various system integrity programs since 2004 and currently have a program which integrates
the company’s bare steel replacement, transmission pipeline integrity management and distribution
pipeline integrity management programs into a single program. In response to the recent pipeline
incidents involving other companies, natural gas distribution businesses are likely to be subject to even
greater federal and state regulatory oversight of the safety of their operations. The “Pipeline Safety,
Regulatory Certainty, and Job Creation Act of 2011” signed into law in early 2012, requires several
new safety initiatives including an analysis of the appropriateness of automatic or remote shut-off
valves on new and replaced gas transmission lines, an evaluation of the benefits of expanding
transmission integrity management regulations to additional pipelines, requirements for operators to
reverify the maximum allowable operating pressures for transmission pipelines, and other
requirements. We intend to work diligently with industry associations and federal and state regulators
to comply with all new laws and regulations. We expect that costs associated with compliance with
federal, state and local rules would be recoverable in rates.

Reliability

The effectiveness of our gas distribution program ultimately rests on whether we provide
reliable service at a reasonable cost to our core utility customers. For this purpose, we develop a
composite design year and include a three day design peak event that is based on the most severe cold
weather experienced during the last 20 years in our service territory. We also assume that all usage by
interruptible customers will be curtailed on the design day. Our projected sources of delivery for design
day firm utility customer sendout total approximately 9.2 million therms. Of this total, we are currently

9

capable of meeting nearly 60 percent of our maximum design day requirements with gas from storage
located within or adjacent to our service territory, while the remaining supply requirements would be
met by gas purchases under firm and recall gas purchase contracts. Optimal utilization of storage on
our design day reduces the cost and dependency on firm interstate pipeline transportation. On
January 5, 2004, we experienced our current record firm customer sendout of 7.2 million therms, and a
total sendout of 8.9 million therms, on a day that was approximately 9 degrees Fahrenheit warmer than
the design day temperature. That January 2004 cold weather event lasted about 10 days, and the actual
firm customer sendout each day provided data that confirmed our load forecasting models with little
re-calibration. Similar cold temperatures experienced in December 2008 and December 2009 produced
very high sendout days, but firm sendout in those years was still at least 3 percent below our 2004
record. Accordingly, we believe that our supplies would be sufficient to meet existing firm customer
demand if we were to experience maximum design day weather conditions. We will continue to
evaluate and update our forecasted requirements and incorporate changes in our integrated resource
plan (IRP) process (see further discussion of IRP below).

The following table shows the sources of supply that are projected to be used to satisfy the

design day sendout for the 2011-2012 winter heating season:

Projected Sources of Utility Supply for Design Day Sendout

Sources of Utility Supply

Firm supply purchases
Mist underground storage (utility only)
Company-owned LNG storage
Off-system firm storage contracts
Recall agreements

Total

Therms
(in millions)

Percent

3.3
2.6
1.8
1.1
0.4

9.2

36
28
20
12
4

100

The OPUC and WUTC have IRP processes in which utilities define different growth scenarios
and corresponding resource acquisition strategies in an effort to evaluate supply and demand resources,
consider uncertainties in the planning process and the need for flexibility to respond to changes, and
establish a plan for getting reliable service at the “least cost.”

In general, the IRP is filed biannually with both the OPUC and the WUTC. An annual update is

filed in Oregon in the off year. The OPUC acknowledges receipt of the IRP; whereas the WUTC
provides notice that our IRP met the requirements of the Washington Administrative
Code. Commission acknowledgment of the IRP does not constitute ratemaking approval of any
specific resource acquisition strategy or expenditure. However, the OPUC generally indicates that it
would give considerable weight in prudency reviews to utility actions that are consistent with
acknowledged plans. The WUTC has indicated that the IRP process is one factor it will consider in a
prudency review. We filed our 2011 IRP with Oregon in January 2011, and with Washington in March
2011. Subsequent to these filings, we filed a modified IRP in both states on September 1, 2011 to
address new assumptions about the schedule for the east segment of the Palomar pipeline (see Part II,
Item 7., “2012 Outlook-Strategic Opportunities-Pipeline Diversification,” below). The OPUC review
of our 2011 IRP filing is in process.

10

Lowest Reasonable Cost

We apply cost management strategies, including fixed-price contracts, financial derivative

instruments, storage supplies, gas reserve purchases and asset management, in seeking to acquire gas
supplies at the lowest reasonable cost for utility customers (see “Gas Supply—Gas Cost Management
Strategy” above).

Price Stability

We use physical assets and financial instruments to manage commodity price volatility. Our

gas storage facilities make it possible to lower the annual average cost of gas by allowing us to
minimize our pipeline capacity demand costs and to purchase gas for storage during the summer
months when gas prices are generally lower. (See “Strategic Use of Gas Storage and Capacity Recall”
above). In addition, we recently signed an agreement with Encana to acquire physical gas supplies to
provide a portion of our core utility customers’ requirements over 30 years. During the first 10 years of
the agreement, we believe the volumes of gas received under the Encana agreement will provide
approximately 8-10 percent of the average annual requirements of our utility customers. (see “Diverse
Supply Portfolio of Contract Types and Durations” above). We also mitigate year-to-year commodity
price volatility through financial hedge contracts such as commodity price swaps and options. (see
“Gas Cost Management Strategy—Financial derivatives instruments” above and Part II, Item 7A.,
“Quantitative and Qualitative Disclosures About Market Risk—Credit Risk—Credit exposure to
financial derivative counterparties.”)

Cost Recovery

Mechanisms for gas cost recovery are designed to be fair and to balance the interests of our

customers and shareholders. In general, utility rates are designed to recover the cost of, but not earn a
return on, the gas commodity sold. We attempt to minimize risks associated with gas cost recovery
through:

•

•

•

re-setting customer rates annually for changes in forecasted gas costs and recovery of
customer deferrals of prior year’s actual versus forecasted gas costs (see Part II, Item 7.,
“Results of Operations—Regulatory Matters—Rate Mechanisms—Purchased Gas
Adjustment”);
aligning customer and shareholder interests, such as through the use of our PGA incentive
sharing mechanism, weather normalization, conservation, and gas storage sharing
mechanisms (see Part II, Item 7., “Results of Operations—Regulatory Matters”); and
periodic review of regulatory deferrals with state regulatory commissions and key customer
groups.

Customers

At year-end 2011, we had approximately 680,000 utility customers, consisting of

approximately 616,000 residential, 63,000 commercial and 1,000 industrial customers. Approximately
90 percent of our utility customers are located in Oregon, and 10 percent are located in
Washington. Industries we serve include: pulp, paper and other forest products; the manufacture of
electronic, electrochemical and electrometallurgical products; the processing of farm and food
products; the production of various mineral products; metal fabrication and casting; the production of
machine tools, machinery and textiles; the manufacture of asphalt, concrete and rubber; printing and
publishing; nurseries; government and educational institutions; and electric generation. No individual
customer or industry accounts for a significant portion of our utility revenues.

11

Competition and Marketing

Competition with Other Energy Products

We have no direct competition in our service area from other natural gas distributors. However,
for residential customers we compete primarily with electricity, fuel oil, propane and renewable energy
providers. We also compete with electricity, fuel oil and renewable energy for commercial
applications. In the industrial market, we compete with all forms of energy, including competition from
third-party sellers of natural gas commodity. Competition among energy suppliers is based on price,
efficiency, reliability, performance, market conditions, technology, legislative policy, and
environmental impact. Whether or not we provide the gas supplies to serve our transportation-eligible
customers, our net margins are not materially affected because we generally do not make any margin
on the commodity sold to our utility customers (see “Industrial Markets,” below and “Regulation and
Rates” above).

Residential and Commercial Markets

The relatively low market saturation of natural gas in residential single-family dwellings in our

service territory, estimated at less than 60 percent, and our operating convenience and environmental
advantage over fuel oil, provides the potential for continuing growth from residential and commercial
conversions. In 2011, the net increase in residential customers was 5,072 primarily from single- and
multi-family new construction, and from the conversion of existing homes from oil, electric and
propane. The net increase of all new customers added in 2011 was 5,546. This represents a 12-month
growth rate of 0.8 percent, which is down slightly from 2010 and well below historical growth rates
due to the slow economic recovery and weak job market.

On an annual basis, residential and commercial customers typically account for about 55 to 60
percent of our utility’s total volumes delivered and about 85 to 90 percent of gross operating revenues,
while industrial customers account for about 40 to 45 percent of volumes and about 10 percent of gross
operating revenues. The remaining gross operating revenues are derived from miscellaneous services
and other regulatory revenues.

Industrial Markets

Competition to serve the industrial and large commercial market in the Pacific Northwest has

been relatively unchanged since the early 1990s in terms of numbers and types of
competitors. Competitors consist of gas marketers, oil/propane sellers and electric utilities.

The OPUC and WUTC have approved transportation tariffs under which we may contract with
customers to deliver customer-owned gas. Transportation tariffs are priced at our sales service rate less
the commodity cost included in that rate. Therefore, our transportation margins (i.e. sales minus the
cost of gas sold) are generally unaffected financially if industrial customers buy commodity supplies
directly from producers or marketers rather than purchasing gas from us, as long as they remain on a
tariff or contract with the same level of service. Other than our incentive sharing arrangements and rate
base return on gas reserves, we do not generally make any margin on the sale of the gas
commodity. However, industrial customers may select between firm and interruptible service as well
as other levels of service, and these choices can positively or negatively affect margin. Firm service
schedules have a higher profit margin than interruptible service. The relative level and volatility of

12

prices in the natural gas commodity markets, along with the availability of pipeline capacity to ship
customer-owned gas, are among the primary factors that have caused some industrial customers to
alternate between sales and transportation service or between higher and lower levels of service. See
“Regulation and Rates” above for a full discussion on incentive sharing agreements.

Our industrial tariffs include terms which are intended to give us more certainty in the level of

gas supplies we will need to purchase in order to serve this customer group. The terms include an
annual election cycle period, special pricing provisions for out-of-cycle changes, and the requirement
that industrial customers on our annual weighted average PGA tariff must complete the agreed upon
term of their service before switching to a new service schedule. In the case of customers switching
out-of-cycle from transportation to sales service, the customer will be charged the incremental cost of
gas supply in accordance with our regulatory tariff.

We have designed custom transportation service agreements with several of our largest
industrial customers. These agreements are primarily designed to provide transportation rates that are
competitive with the customer’s alternative capital and operating costs of installing direct pipeline
connections to Northwest Pipeline’s interstate pipeline system, which would allow them to bypass our
local gas distribution system. These agreements generally prohibit bypass during their terms. Due to
the cost pressures that confront a number of our largest customers competing in global markets, bypass
continues to be a competitive threat. Although we do not expect a significant number of our large
customers to bypass our system in the foreseeable future, we may experience further deterioration of
margin associated with customers transferring to special contracts where pricing is specifically
designed to be competitive with their bypass alternative.

Transportation of Gas Supplies

Single transportation pipeline

Our local gas distribution system is reliant on a single, bi-directional interstate transmission
pipeline, to bring gas supplies into our distribution system. Although we are dependent on a single
pipeline, the pipeline’s gas flows into the Portland metropolitan market from two directions: (1) the
north, which brings supplies from the British Columbia and Alberta supply basins; and (2) the east,
which brings supplies from Alberta as well as the U.S. Rocky Mountain supply basins. In 2003 a
federal order requiring Northwest Pipeline to replace its 26-inch mainline from the Canadian border to
our service territory underscored the potential need for pipeline transportation diversity. That
replacement project was completed by Northwest Pipeline in November 2006. We are pursuing other
options to further diversify our pipeline transportation paths. Specifically, we are jointly developing
plans to build a pipeline (Palomar pipeline) that would connect TransCanada Pipelines Limited’s
(TransCanada) Gas Transmission Northwest (GTN) interstate transmission line to our local gas
distribution system. We entered into an agreement with GTN for the purpose of jointly developing,
owning and operating this proposed pipeline. Additionally, we entered into precedent agreements to
become a shipper on the Palomar pipeline. If constructed, this pipeline would provide another
transportation path for gas purchases from Alberta and the U.S. Rocky Mountains in addition to the
one that currently moves gas through the Northwest Pipeline system (See Part II, Item 7., “2012
Outlook—Strategic Opportunities—Pipeline Diversification”).

13

Pipeline transportation agreements

We incur monthly demand charges related to the following firm pipeline contracts. The largest

of our transportation agreements with Northwest Pipeline extends through September 2018 and
provides for firm transportation capacity of up to 2.1 million therms per day. This agreement provides
access to natural gas supplies in British Columbia and the U.S. Rocky Mountains.

Our second largest transportation agreement with Northwest Pipeline extends through
November 2016. It provides up to 1.0 million therms per day of firm transportation capacity from the
point of interconnection with Northwest Pipeline and GTN systems in eastern Oregon to our service
territory. GTN’s pipeline runs from the U.S./Canadian border through northern Idaho, southeastern
Washington and central Oregon to the California/Oregon border. We have firm long-term capacity on
GTN’s pipeline and two upstream pipelines in Canada, which match the amount of Northwest Pipeline
capacity northward into Alberta, Canada.

We also have an agreement with Northwest Pipeline that extends into 2044 for approximately

350,000 therms per day of firm transportation capacity from the U.S. Rocky Mountain
region. Additionally, in 2008 we executed an agreement with a third party to take assignment of their
firm transportation contract starting January 1, 2017, with the term extending through 2046. This
contract consists of 120,000 therms per day on Northwest Pipeline from the U.S. Rocky Mountain
region.

In addition, we have firm long-term pipeline transportation contracts with two other major

transporters located in Canada. One contract extends through October 2014 and provides
approximately 580,000 therms per day of firm gas transportation from Station 2 in northern British
Columbia to the Huntingdon/Sumas connection with Northwest Pipeline at the U.S./Canadian
border. Another contract extends through October 2020 and provides approximately 480,000 therms
per day of firm transportation from southeastern British Columbia to the same Huntingdon/Sumas
connection with Northwest Pipeline. Our capacity on this second contract is matched with companion
contracts for pipeline capacity on the TransCanada systems in British Columbia and Alberta, allowing
purchases to be made from the gas fields of Alberta, Canada.

Rates governing transportation of gas supplies

FERC establishes rates for interstate pipeline transportation service under long-term agreements

within the U.S., and Canadian authorities establish rates for service under agreements with the
Canadian pipelines over which we ship gas.

Gas Storage

Our gas storage segment primarily consists of two underground natural gas storage facilities,

including the non-utility portion of our Mist gas storage facility near Mist, Oregon and our 75 percent
ownership share of the Gill Ranch gas storage facility near Fresno, California. Because transmission
pipeline capacity and natural gas production are relatively constant over the course of a year compared
to the demand for natural gas, which fluctuates daily and seasonally, natural gas storage facilities are
needed to manage the flow and availability of gas supplies during periods of low demand so these
supplies can be stored and delivered into markets during periods of high demand. We capitalize on the
imbalance of supply and demand for natural gas by providing our gas storage customers with the

14

ability to store gas for resale or use in a higher value period. Our natural gas storage facilities allow us
to offer customers “multi-cycle” storage service, which permits them to inject and withdraw natural
gas multiple times a year, providing more flexibility to capture market opportunities. See Note 4 for
more information on gas storage assets and results of operations for the three years ended
December 31, 2011.

Regulation and Rates

Our gas storage segment is subject to regulation with respect to, among other matters, rates,

terms of services, and system of accounts established by the OPUC, WUTC and FERC with respect to
the Mist facilities, and by the California Public Utilities Commission (CPUC) with respect to Gill
Ranch. Gill Ranch has a tariff on file with the CPUC authorizing it to charge market-based rates for the
storage services offered. FERC has approved maximum cost-based rates under our Mist interstate
storage certificate, and at least every five years we are required to file with FERC either a petition for
rate approval or a cost and revenue study to change or justify maintaining the existing rates for the
interstate storage service. For further information, See Part II, Item 7., “results of Operations—
Regulatory Matters,” below.

Facilities

Mist Storage Facility. We provide gas storage services to customers in the interstate and

intrastate markets from our Mist gas storage facilities located in Columbia County, Oregon, near the
town of Mist. The Mist field was converted to storage operations for our core local gas distribution
customers. Since 2001, we have made gas storage capacity at Mist available to interstate customers by
developing new incremental capacity in advance of core utility customer requirements to meet the
demands for interstate storage service. These interstate storage services are offered under a limited
jurisdiction blanket certificate issued by FERC. In addition, since 2005 we have offered firm storage
services in Oregon under an OPUC-approved rate schedule as an optional service to eligible
non-residential utility customers. Currently, the Mist facilities consist of seven depleted natural gas
reservoirs with a combined working gas capacity of approximately 16 Bcf, a combined deliverability
of approximately 0.5 Bcf per day, a central compression facility, gathering pipelines and other related
facilities.

In addition to earning revenue from storage contracts, we also contract with an independent
energy marketing company to provide asset management services using our utility and non-utility
storage and transportation capacity, the results of which are included in the gas storage business
segment. Pre-tax income from gas storage at Mist and third-party management services using our
utility’s storage or transportation capacity is subject to revenue sharing with core utility customers. In
Oregon, 80 percent of the pre-tax income is retained by the gas storage segment when the costs of the
capacity used have not been included in utility rates, and 33 percent of the pre-tax income is retained
when the capacity costs have been included in utility rates. The remaining 20 percent and 67 percent of
pre-tax income in each case are credited to a deferred regulatory account for refund to core utility
customers. We have a similar sharing mechanism in Washington for pre-tax income derived from gas
storage services and third-party asset management activities.

Gill Ranch Storage Facility. Gill Ranch Storage, LLC (Gill Ranch), our subsidiary, has a joint
project agreement with Pacific Gas and Electric Company (PG&E) to develop and own the Gill Ranch
underground natural gas storage facility near Fresno, California. Currently, Gill Ranch owns a 75
percent undivided interest in this facility and is the sole operator of the facility. The Gill Ranch facility
began operations in the fourth quarter of 2010.

15

The Gill Ranch facility currently consists of three depleted natural gas reservoirs, twelve

injection and withdrawal wells, a compressor station, dehydration and control equipment, gathering
lines, an electric substation, a natural gas transmission pipeline extending 27 miles from the storage
field to an interconnection with the PG&E transmission system, and other related facilities. Gill Ranch
owns the rights to 75 percent of the available storage capacity at the facility. Gill Ranch’s share is
designed to provide 15 Bcf of working gas capacity, which we expect to be in full use by the end of
2012.

Gill Ranch is offering storage services to the California market at market-based rates, subject to
regulation by the CPUC for certain activities including, but not limited to, service terms and operating
conditions.

Assets. The following table highlights certain important design information about the

Company’s non-utility gas storage assets.

Mist Storage (1)
Gill Ranch Storage

Storage
Capacity (Bcf)

Withdrawal
(MMcf/day) (3)

Injection
(MMcf/day) (3)

6
15 (2)

258
488

103
240

(1) Approximately 6 Bcf of a total 16 Bcf at Mist is currently available to our gas storage segment. The remaining 10 Bcf is
used to provide gas storage for our local distribution business and its utility customers. All storage capacity and daily
deliverability currently developed for the gas storage segment at Mist is available for recall by the utility.

(2) Our share of the Gill Ranch facility is currently designed to provide 15 Bcf out of a total of 20 Bcf.
(3) Our share of the expected daily maximum injection and withdrawal rates.

Gas Storage Operations

Asset management. With respect to the Mist gas storage facility, we contract with an
independent energy marketing company to provide asset management services for our utility pipeline
transportation contracts, our utility gas supplies and our unused utility and non-utility storage assets,
primarily through the use of commodity transactions and pipeline capacity release transactions (see
“Facilities—Mist Gas Storage Facility,” above). Similarly, we contract with an independent energy
marketing company to manage the value of our unused storage assets at the Gill Ranch gas storage
facility (see “Facilities—Gill Ranch Gas Storage Facility,” above). The results of asset management
services at both facilities are included in the gas storage business segment, except for amounts
allocated to our utility pursuant to regulatory sharing agreements involving the use of utility assets.

Seasonality of business. Generally, Mist gas storage revenues do not follow seasonal patterns

similar to those experienced by the utility because most of the storage capacity is contracted with
customers for firm service, and rates for firm service are primarily in the form of fixed monthly
reservation charges and not affected by customer usage. However, there is seasonal variation from the
management of available surplus storage capacity and related transportation capacity. Temporary
surplus capacity is quite often available during the spring and summer months when the demand for
gas by utility customers is low.

Although we expect much of the storage revenue at Gill Ranch to be in the form of fixed
monthly demand charges, total cash flows from the Gill Ranch storage facility could be more seasonal

16

in nature than the Mist storage facility. A significant portion of operating costs at Gill Ranch is related
to compression. Because compression is used primarily for the injection of gas rather than for
withdrawal, we expect power costs to be incurred disproportionately during the injection season.

Gas storage customers. For our Mist interstate storage services, firm service agreements with
customers are entered into with terms typically ranging from 1 to 10 years. Currently, our gas storage
revenues from Mist are derived primarily from firm storage service customers who provide energy
related services, including natural gas production or distribution, electric generation and energy
marketing. Three storage customers currently account for over 90 percent of our existing non-utility
gas storage capacity at Mist, with the largest customer accounting for about half of total
capacity. These three customers have contracts that expire at various dates through April 2017.

Customer contracts for firm storage capacity at Gill Ranch are as long as 28 years in duration,
but we expect Gill Ranch in the early years of operation to contract for terms mostly ranging from one
to five years due to current market conditions. Gill Ranch currently has several storage customers, with
the largest single contract accounting for approximately 13 percent of the facility’s design capacity.
The California market served by Gill Ranch is larger, and has a greater diversity of prospective
customers, than the Pacific Northwest market served by Mist. As such, we expect there to be less
sensitivity to any single customer or group of customers for capacity at Gill Ranch. Current Gill Ranch
customers provide energy related services, including natural gas production, marketing and electric
generation.

Competitive conditions. Our Mist gas storage facility benefits from limited competition from

other Pacific Northwest storage facilities primarily because of its geographic location. However,
competition from other storage providers in the Pacific Northwest region and Canada, as well as
competition for interstate pipeline capacity, does exist. In the future, we could face increased
competition from new or expanded gas storage facilities as well as from new natural gas pipelines,
marketers and alternative energy sources.

The Gill Ranch storage facility competes with a number of other storage providers, including

local integrated gas companies and other independent storage operators in the northern California
market. There is also ongoing expansions and proposed new construction of storage capacity in
northern California that could increase competition for Gill Ranch.

Interstate gas storage. The Mist gas storage facility currently provides firm and interruptible

gas storage services with related transportation services on the utility’s system to and from Mist to
interstate pipeline interconnections in order to serve customers in interstate commerce. The interstate
storage services, and maximum rates for these services, are authorized and regulated by the FERC. The
storage capacity used by this business segment has been developed as a non-utility investment by NW
Natural in advance of core utility customers’ requirements.

Gill Ranch storage facility is not currently authorized to provide interstate gas storage services.

Intrastate gas storage. The Mist gas storage facility provides intrastate gas storage services in

Oregon under an OPUC-approved rate schedule that includes service eligibility and site-specific
qualifications. The firm storage service rates, terms and conditions mirror our firm interstate storage
service regulated by FERC, except that these customers are located and served in Oregon.

17

Gill Ranch provides intrastate storage services in California at market-based rates under a

CPUC-approved tariff that includes firm storage service, interruptible storage service and park and
loan storage services.

Storage Expansions.

Mist Storage Facility. While the Pacific Northwest storage markets have been negatively
impacted by lower gas prices and lack of price volatility, albeit less so than in California, we continue
to plan for future expansion at Mist. We believe the earliest timeframe for completing the next
expansion is 2016. In the meantime, we expect to continue working on preliminary design and project
scope, which will likely include the development of storage wells, potentially a second compression
station, and additional pipeline gathering facilities that would enable more storage expansions in the
future.

Gill Ranch Storage Facility. Subject to market demand, project execution, available financing,

receipt of future permits, and other rights, Gill Ranch can be expanded beyond the current combined
permitted capacity of 20 Bcf without further expansion of the takeaway pipeline system. Taking these
considerations into account and with certain infrastructure modifications, we currently estimate that the
Gill Ranch storage facility could support an aggregate storage capacity of at least 40 Bcf, of which Gill
Ranch would have the rights to an aggregate of 20 Bcf or 50 percent of total estimated storage
capacity.

Other

We have non-utility investments and other business activities which are aggregated and
reported as a business segment called “Other.” Although in the aggregate these investments and
activities are not material, we identify and report them as a stand-alone segment because these
investments and activities are not specifically related to our utility or gas storage segments. This
segment primarily consists of: an equity method investment in a joint venture to build and operate a
gas transmission pipeline in Oregon (see Part II, Item 7., “2012 Outlook—Strategic Opportunities—
Pipeline Diversification,” below); a minority interest in other pipeline assets held by our wholly-owned
subsidiary NNG Financial; and other operating and non-operating expenses of the parent company that
are not included in utility or gas storage operations. Less than 1 percent of our consolidated assets and
consolidated net income are related to activities in the “Other” business segment. This pipeline is
regulated by FERC. See Note 4 for summary information on this Other segment’s assets and results of
operations for the three years ended December 31, 2011.

Environmental Issues

Properties and Facilities

We have properties and facilities that are subject to federal, state and local laws and regulations

related to environmental matters. These laws and regulations may require expenditures over a long
timeframe to address certain environmental impacts. Estimates of liabilities for environmental response
costs are difficult to determine with precision because of the various factors that can affect their
ultimate disposition. These factors include, but are not limited to, the following:

•
•
•

the complexity of the site;
changes in environmental laws and regulations at the federal, state and local levels;
the number of regulatory agencies or other parties involved;

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•

•
•
•

new technology that renders previous technology obsolete, or experience with existing
technology that proves ineffective;
the ultimate selection of a particular technology;
the level of remediation required; and
variations between the estimated and actual period of time that must be dedicated to
respond to an environmentally-contaminated site.

We own, or previously owned, properties currently being investigated that may require

environmental response. Based on our current assessment of regulatory and insurance recovery of
environmental costs, we do not expect that the ultimate resolution of these matters will have a material
adverse effect on our financial condition, results of operations or cash flows; however, if it is
determined that both the insurance recovery and future rate recovery of such costs are not probable,
then the costs not expected to be recovered will be charged to expense in the period such determination
is made and could have a material impact on our financial condition or results of operations. See Note
15 for a further discussion of potential environmental responses, related costs and regulatory and
insurance recovery.

Greenhouse Gas Issues

We recognize that our businesses are likely to be impacted by carbon constraints. A variety of

legislative and regulatory measures to address greenhouse gas emissions are in various phases of
discussion or implementation. These include proposed international standards, proposed federal
legislation, proposed or enacted federal regulations, and proposed or enacted state actions to develop
statewide or regional programs, each of which has imposed or would impose measures to achieve
reductions in greenhouse gas emissions. For example, in December 2009, the EPA published its
findings that concentrations of carbon dioxide, methane and other greenhouse gases present an
endangerment to human health and the environment as drivers of climate change, and that emissions
from motor vehicles contribute to that threat. Based on these findings by the EPA, the agency
proceeded with the adoption and implementation of regulations to regulate emissions of greenhouse
gas starting in January 2011 from new motor vehicles and from stationary sources of air pollution such
as power plants and oil refineries. One of these new regulations, which the EPA refers to as the
“Tailoring Rule,” requires that permits held by larger sources of air pollution address greenhouse
gases, and also requires additional permitting and implementation of best available control technology
for limiting greenhouse gas emissions at certain new facilities and at existing facilities when they
implement modifications that increase emissions of greenhouse gas above threshold levels. Lawsuits
have been filed challenging the EPA’s regulation of greenhouse gas emissions, and members of the
U.S. Congress have discussed proposing legislation that would limit the EPA’s ability to regulate
greenhouse gas emissions.

In September 2009, the EPA issued a final rule requiring the annual reporting of greenhouse
gas emissions from certain industries, specified large greenhouse gas emission sources, and facilities
that emit 25,000 metric tons or more of CO2 equivalents per year. The first reports were due on
March 31, 2011 for emissions occurring on or after January 1, 2010. Under this reporting rule, local
gas distribution companies like NW Natural are required to report system throughput to the EPA on an
annual basis. The EPA also issued additional greenhouse gas reporting regulations requiring the annual
reporting of fugitive emissions from our operations. The first report under these more recent
regulations is due by March 31, 2012.

The outcome of these and other international, federal and state climate change initiatives cannot

be determined at this time, but these initiatives could produce a number of results including potential

19

new regulations, legal actions, additional charges to fund energy efficiency activities, or other
regulatory actions. The adoption and implementation of any regulations limiting emissions of
greenhouse gas from our operations could require us to incur costs to reduce emissions of greenhouse
gas associated with our operations, which could result in an increase in the prices we charge our
customers or a decline in the demand for natural gas. On the other hand, because natural gas is a fossil
fuel with relatively low carbon content, it is also possible that future carbon constraints could create
additional demand for natural gas for electric generation, direct use of natural gas in homes and
businesses, and as a reliable and relatively low-emission back-up fuel source for alternative energy
sources. Requirements to reduce greenhouse gas emissions from the transportation sector, such as
those in Oregon’s low carbon fuel standard passed in 2009, could also result in additional demand for
natural gas for use in vehicles.

We continue to take steps to address future greenhouse gas emission issues, including actively

participating in policy development through participation on various Oregon taskforces and, at the
federal level, within the American Gas Association. We continue to engage in policy development and
in identifying ways to reduce greenhouse gas emissions associated with our operations and our
customers’ gas use, including offering the Smart Energy program, which allows customers to
voluntarily contribute funds to projects such as biodigesters on dairy farms that offset the greenhouse
gases produced from their natural gas use.

Employees

At December 31, 2011, the utility workforce consisted of 598 members of the Office and

Professional Employees International Union (OPEIU) Local No. 11, AFL-CIO, and 452 non-union
employees. Our labor agreement with members of OPEIU that covers wages, benefits and working
conditions extends to May 31, 2014, and thereafter from year to year unless either party serves notice
of its intent to negotiate modifications to the collective bargaining agreement.

At December 31, 2011, our subsidiaries had a combined workforce of 21 non-union employees.

Our subsidiaries receive certain services from centralized operations at the utility, and as such the
utility is reimbursed for those services pursuant to a Shared Services Agreement.

Additions to Infrastructure

We make capital expenditures in order to maintain and enhance the safety and integrity of our

pipelines, terminals, storage facilities and related assets, to expand the reach or capacity of those assets,
or improve the efficiency of our operations to pursue new business opportunities. We expect to make a
significant level of capital expenditures for additions to utility and gas storage infrastructure over the
next five years, reflecting continued investments in customer growth, technology, distribution system
improvements and gas storage facilities. In 2012, utility capital expenditures are estimated to be
between $145 and $160 million, and non-utility capital investments are estimated to be between $10
and $15 million. For the five-year period ending in 2016, capital expenditures for the utility are
estimated to be between $400 and $500 million, while the amount for gas storage and other
investments after 2012 will depend largely on future decisions about potential expansion opportunities
in gas storage and pipeline projects.

Executive Officers of the Registrant

For information concerning our executive officers, see Part III, Item 10.

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Available Information

We file annual, quarterly and special reports and other information with the Securities and
Exchange Commission (SEC). Reports, proxy statements and other information filed by us can be read
and copied at the Public Reference Room of the SEC, 100 F Street, N.E., Washington, D.C. 20549.
You can obtain additional information about the Public Reference Room by calling the SEC at
1-800-SEC-0330. The SEC also maintains a website (http://www.sec.gov) that contains reports, proxy
and information statements and other information that we file electronically. In addition, we make
available on our website (http://www.nwnatural.com), our annual report on Form 10-K, quarterly
reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished
pursuant to Section 13(a) or 15(d) and proxy materials filed under Section 14 of the Securities
Exchange Act of 1934, as amended (Exchange Act), as soon as reasonably practicable after we
electronically file such material with, or furnish it to, the SEC.

We have adopted a Code of Ethics for all employees and officers that is available on our
website. We intend to disclose amendments to, and any waivers from the Code of Ethics on our
website. Our Corporate Governance Standards, Director Independence Standards, charters of each of
the committees of the Board of Directors and additional information about us are also available at the
website. Copies of these documents may be requested, at no cost, by writing or calling Shareholder
Services, NW Natural, One Pacific Square, 220 N.W. Second Avenue, Portland, Oregon 97209,
telephone 503-226-4211 ext. 3412.

ITEM 1A. RISK FACTORS

Our business and financial results are subject to a number of risks and uncertainties, many of

which are not within our control. When considering any investment in our securities, investors should
carefully consider the following information, as well as information contained in the caption “Forward-
Looking Statements,” Item 7A., and other documents we file with the SEC. This list is not exhaustive
and the order of presentation does not reflect management’s determination of priority or likelihood.
Additionally, our listing of risk factors that primarily affect one of our business segments does not
indicate that such risk factor is inapplicable to our other business segments.

Risks Related to our Business Generally

Regulatory risk. Regulation of our businesses, including changes in the regulatory

environment in general, and failure of regulatory authorities to approve rates which provide for timely
recovery of our costs and an adequate return on invested capital in particular, or an unfavorable
outcome in ratemaking proceedings may adversely impact our financial condition and results of
operations.

The OPUC and WUTC have general regulatory authority over our utility business in Oregon
and Washington, respectively, including the rates charged to customers, authorized rates of return on
capital invested, the amounts and types of securities we may issue, services we provide, facilities we
own or operate, terms of customer services, system of accounts, the nature of investments we may
make, safety standards, deferral and recovery of various expenses, including, but not limited to,
pipeline replacement and environmental remediation costs, transactions with affiliated interests,
actions investors may take with respect to our company and other matters. Similarly, in our gas storage
business FERC has regulatory authority over interstate storage services, and the CPUC has regulatory
authority over our Gill Ranch storage operations.

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The prices that the OPUC and WUTC allow us to charge for retail service, and the tariff rate
that the Federal Energy Regulatory Commission permits us to charge for transmission, are the most
significant factors affecting our financial position, results of operations and liquidity. The OPUC and
WUTC have the authority to disallow recovery of any costs they consider unreasonable or imprudently
incurred, and the rates allowed by the FERC may be insufficient for recovery of costs incurred. For
example, we expect to continue to make expenditures to expand, improve and operate our utility
distribution and gas storage systems. Regulators can deny such expansions or improvements or
recovery of expenditures we make if they find that such expenditures were not prudently incurred
according to their regulatory standards. Additionally, while the OPUC and WUTC have established
through the ratemaking process an authorized rate of return for our utility, the regulatory process does
not provide assurance that we will be able to achieve the earnings level authorized.

Moreover, in the normal course of business we may place assets in service or incur higher than

expected levels of operating expense before rate cases can be filed to recover those costs—this is
commonly referred to as “regulatory lag.” The failure of any regulatory commission to approve
requested rate increases on a timely basis to recover increased costs or to allow an adequate return
could adversely impact our financial condition and results of operations.

We filed a general rate case in Oregon on December 30, 2011. While the OPUC is required to

establish rates that are fair, just and reasonable, they have significant discretion in applying this
standard. The ratemaking process typically involves multiple parties, including governmental agencies,
consumer advocacy groups, and others who are impacted by the use of natural gas. Each party has
differing concerns, but all generally have the same common objective of limiting rate increases or even
reducing rates. Our rate case proposes to establish rates based on forecasted operating and capital
expenditures that rely on many assumptions concerning future conditions and operating results. In the
ratemaking process, regulators and interveners can challenge these assumptions and may assert
different assumptions or apply different interpretations to the data. We cannot predict the ultimate
outcome of any ratemaking proceeding, including the extent to which certain costs, such as significant
capital projects, are recoverable; what rates of return will be allowed; and whether, or in what form,
our regulatory mechanisms, such as our weather normalization mechanism or conservation tariff, will
be renewed. Additionally, we may agree to conditions as part of a settlement or regulatory proceeding,
or there may be determinations made in regulatory investigations, that reduce our earnings and
liquidity, all of which could adversely affect our results of operations and financial condition.

Economic risk. Changes in the economy and in the financial markets may have a negative

impact on our financial condition and results of operations.

Changes in economic activity in our markets and in global financial markets can result in a

decline in or sustained lower levels of energy consumption, which could have a negative effect on our
financial condition and results of operations. In recent years, the U.S. and world economies have
slowed, credit markets have tightened, unemployment rates and mortgage defaults have risen, and the
value of homes and other personal as well as business investments have declined, which has adversely
affected the income and financial resources of many domestic households and businesses. It is unclear
whether the federal responses, as well as international, to these conditions will lessen the severity or
duration of this economic downturn, or could possibly trigger inflationary conditions. Our operations
and financial results are affected by these economic conditions. Less new housing construction, fewer
conversions to natural gas, fewer customer additions, higher levels of residential foreclosures and
vacancies, tighter lending restrictions, higher levels of personal and business bankruptcies or reduced

22

spending could all result in a decline in or sustained lower levels of energy consumption and customer
growth, a slowing of collections from our customers, and higher levels of delinquent accounts
receivable and bad debts, all of which could have a negative effect on our financial condition and
results of operations.

Environmental liability risk. Certain of our properties and facilities may pose environmental
risks requiring remediation, the cost of which could adversely affect our financial condition, results of
operations and cash flows.

We own, or previously owned, properties that require environmental remediation or other

action. We accrue all material loss contingencies relating to these properties. A regulatory asset at the
utility has already been recorded for estimated costs pursuant to a deferral order from the OPUC and
WUTC. To the extent we are unable to recover these deferred costs in utility customer rates or through
insurance, we would be required to reduce our regulatory asset which would result in a charge to
current year earnings. In addition, disputes may arise between potentially responsible parties and
regulators as to the severity of particular environmental matters and what remediation efforts are
appropriate.

We cannot predict with certainty the amount or timing of future expenditures related to

environmental investigation and remediation that may be required, or disputes arising in relation
thereto or the outcomes of those disputes, because of the difficulty of estimating such costs. There is
also uncertainty in quantifying liabilities under environmental laws that impose joint and several
liabilities on all potentially responsible parties. This uncertainty and disputes arising therefrom could
lead to adversarial administrative proceedings or litigation, with associated costs and uncertain
outcomes, all of which could adversely affect our financial condition, results of operations and cash
flows.

Business development risk. The development, construction, startup and operation of our
business development projects may involve unanticipated changes or delays that could negatively
impact our costs as well as our financial condition, results of operations and cash flows.

Business development projects involve many risks. We are currently engaged in several
business development projects, including, but not limited to, the early planning and development stage
on the Palomar gas transmission pipeline in Oregon. We may also engage in other business
development projects in the future, including expansion of our gas storage facilities at Mist or Gill
Ranch, or the investment in additional long-term gas reserves. With respect to these projects, we may
not be able to obtain required governmental permits and approvals, or financing, to complete our
projects in a cost-efficient or timely manner. If we do not obtain the necessary regulatory approvals in
a timely manner, development projects may be delayed or abandoned. There also may be startup and
construction delays, construction cost overruns, inability to negotiate acceptable agreements such as
rights-of-way, easements, construction, gas supply or other material contracts, changes in customer
demand or commitment, public opposition to projects, changes in market prices, and operating cost
increases. Additionally, natural gas storage and transportation markets are highly competitive, both
within the natural gas industry and with alternative sources of energy. To fund our business
development projects, we will need to secure financing from willing investors at reasonable costs. We
may be unable to finance our business development projects at acceptable interest rates or within a
scheduled timeframe for completing the project. One or more of these events could result in the project
becoming impaired, and such impairment could have an adverse effect on our financial condition and
results of operations.

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Joint partner risk. Investing in business development projects through partnerships, joint

ventures or other business arrangements affects our ability to manage certain risks and could
adversely impact our financial condition, results of operations and cash flows.

We use joint ventures and other business arrangements to manage and diversify the risks of

certain utility and non-utility development projects, including Palomar pipeline, Gill Ranch storage and
Encana gas reserves. Also, we may acquire or develop part-ownership interests in other similar
projects in the future. Under these types of business arrangements, we may not be able to fully direct
the management and policies of the business relationships, and other participants in those relationships
may take action contrary to our interests including making operational decisions that could affect our
costs and liabilities related to a project. In addition, other participants may withdraw from the project,
become financially distressed or bankrupt, or have economic or other business interests or goals that
are inconsistent with ours. With respect to our gas reserves venture, the drilling of new wells for gas
may not produce the expected volumes of gas, or any gas. Additionally, environmental regulations may
require operational improvements to mitigate potential environmental damage, increasing operating
costs to us. Although we have contractual and other legal remedies to mitigate these risks and enforce
our interests, dry wells, increased operational costs, or a participant in one of these business
arrangements acting contrary to our interests, it could adversely impact the project as well as our
financial condition, results of operations and cash flows.

Global climate change risk. Future legislation may impose carbon constraints to address

global climate change, exposing us to regulatory and financial risk. Additionally, certain properties
and facilities may be subject to physical risks associated with climate change.

There are a number of new international, federal and state legislative and regulatory initiatives

being proposed and adopted in an attempt to measure, control or limit the effects of global warming
and overall climate change, including greenhouse gas emissions such as carbon dioxide. The adoption
of current or future proposed legislation by the U.S. Congress or similar legislation by states, or the
adoption of related regulations by federal or state regulatory bodies such as the EPA, imposing
reporting obligations on, or limiting emissions of greenhouse gases from our equipment or operations
could have far-reaching and significant impacts on our business as well as the broader energy
industry. Such current or future legislation or regulation could also impose on us operational
requirements or restrictions or additional charges to fund energy efficiency initiatives. Such initiatives
could result in us incurring additional costs to comply with the imposed restrictions, provide a cost
advantage to energy sources other than natural gas, reduce demand for natural gas, impose costs or
restrictions on end users of natural gas, impact the prices we charge our customers, impose on us
increased costs associated with the adoption of new infrastructure and technology to respond to such
requirements, and may impact cultural perception of our service or products negatively, diminishing
the value of our brand, all of which could adversely affect our business practices, financial condition
and results of operations.

Climate change may cause physical risks, including an increase in sea level, intensified storms,

water scarcity and changes in weather conditions, such as changes in precipitation, average
temperatures and extreme wind or other climate conditions. A significant portion of the nation’s gas
infrastructure is located in areas susceptible to storm damage that could be aggravated by wetland and
barrier island erosion, which could give rise to gas supply interruptions and price spikes.

These and other physical changes could result in changes in customer demand, increased costs
associated with repairing and maintaining distribution systems resulting in increased maintenance and

24

capital costs, increased financing needs, limits on our ability to meet peak customer demand, increased
regulatory oversight, and lower customer satisfaction. Also, to the extent that climate change adversely
impacts the economic health of our region, it may adversely impact customer demand and
revenues. Such physical risks could have an adverse effect on our financial condition, results of
operations, and cash flows.

Operating risk. Transporting and storing natural gas involves numerous risks that may result

in accidents and other operating risks and costs, some or all of which may not be fully covered by
insurance, and which could adversely affect our financial condition, results of operations and cash
flows.

Our operations are subject to all of the risks and hazards inherent in the businesses of local gas

distribution and storage, including:

•
•

•

•
•

•

earthquakes, floods, storms, landslides and other adverse weather conditions and hazards;
leaks or other losses of natural gas or other hydrocarbons as a result of the malfunction of
equipment or facilities;
damages from third parties, including construction, farm and utility equipment or other
surface users;
operator errors;
negative unpredicted performance by our storage reservoirs that could cause us to fail to
meet expected or forecasted operational levels or contractual commitments to our
customers;
problems maintaining, or the malfunction of, pipelines, wellbores and related equipment
and facilities that form a part of the infrastructure that is critical to the operation of our gas
distribution and storage facilities;
collapse of underground storage caverns;

•
• migration of natural gas through faults in the rock or to some area of the reservoir where

•

•

existing wells cannot drain the gas effectively;
blowouts (uncontrolled escapes of gas from a pipeline or well) or other accidents, fires and
explosions; and
risks and hazards inherent in the drilling operations associated with the development of the
gas storage facilities and/or wells.

These risks could result in personal injury or loss of human life, damage to and destruction of

property and equipment, pollution or other environmental damage, breaches of our contractual
commitments, and may result in curtailment or suspension of our operations, which in turn could lead
to significant costs and lost revenues. Further, because our pipeline, storage and distribution facilities
are in or near populated areas, including residential areas, commercial business centers, and industrial
sites, any loss of human life or adverse financial outcome resulting from such events could be
significant. Natural gas that moves outside of the effective drainage area through migration could be
permanently lost and would need to be replaced. Additionally, we may not be able to obtain the level
or types of insurance we desire, and the insurance coverage we do obtain may contain large deductibles
or fail to cover certain hazards or cover all potential losses. The occurrence of any operating risks not
covered by insurance could adversely affect our financial condition, results of operations and cash
flows.

25

Business continuity risk. We may be adversely impacted by local or national disasters,

pandemic illness, terrorist activities and other extreme events to which we may not able to promptly
respond.

Local or national disasters, pandemic illness, terrorist activities and other extreme events are a

threat to our assets and operations. Companies in our industry may face a heightened risk due to
exposure to acts of terrorism that could target or impact our natural gas distribution, transmission or
storage facilities and result in a disruption in our operations and ability to meet customer
requirements. In addition, the threat of terrorist activities could lead to increased economic instability
and volatility in the price of natural gas that could affect our operations. Threatened or actual national
disasters or terrorist activities may also disrupt capital markets and our ability to raise capital, or
impact our suppliers or our customers directly. Local disaster or pandemic illness could result in part of
our workforce being unable to operate or maintain our infrastructure or perform other tasks necessary
to conduct our business. We maintain emergency planning and training programs to remain ready to
respond to events that could cause business interruption. However, a slow or inadequate response to
events may have an adverse impact on operations and earnings. We may not be able to obtain
sufficient insurance to cover all risks associated with local and national disasters, pandemic illness,
terrorist activities and other events, which could increase the risk that an event could adversely affect
our operations or financial results.

Employee benefit risk. The cost of providing pension and postretirement healthcare benefits is

subject to changes in pension assets and liabilities, changing employee demographics and changing
actuarial assumptions, which may have an adverse effect on our financial condition, results of
operations and cash flows.

We provide pension plans and postretirement healthcare benefits to most eligible full-time
employees and retirees. Our cost of providing such benefits is subject to changes in the market value of
our pension assets, changes in employee demographics including longer life expectancies, increases in
healthcare costs, current and future legislative changes including but not limited to the Health Care
Reform Act in 2010, and various actuarial calculations and assumptions. The actuarial assumptions
used to calculate our future pension and postretirement healthcare expense may differ materially from
actual results due to significant market fluctuations and changing withdrawal rates, wage rates, interest
rates and other factors. These differences may result in an adverse impact on the amount of pension
contributions, pension expense or other postretirement benefit costs recorded in future
periods. Sustained declines in equity markets and reductions in bond rates may have a material adverse
effect on the value of our pension fund assets. In these circumstances, we may be required to recognize
increased contributions and pension expense earlier than we had planned to the extent that the value of
pension assets is less than the total anticipated liability under the plans, which could have a negative
impact on financial condition, results of operations and cash flows.

Workforce risk. Our business is heavily dependent on being able to attract and retain
qualified employees and maintain a competitive cost structure with market-based salaries and
employee benefits, and workforce disruptions could adversely affect our operations and results.

Our ability to implement business strategy and serve our customers is dependent upon our

continuing ability to attract and retain talented professionals and a technically skilled workforce, and
being able to transfer the knowledge and expertise of our workforce to new employees as our aging
employees retire. Without an appropriately skilled workforce, our ability to provide quality service and

26

meet our regulatory requirements will be challenged and this could negatively impact our
earnings. Additionally, within our utility segment a majority of our workers are represented by the
Office and Professional Employees International Union Local No.11 AFL-CIO (the Union), and are
covered by a collective bargaining agreement that extends to May 31, 2014. Disputes with the Union
over terms and conditions of the agreement could result in instability in our labor relationship and work
stoppages that could impact the timely delivery of gas and other services from our utility and Mist gas
storage, which could strain relationships with customers and state regulators and cause a loss of
revenues. Our collective bargaining agreement may also increase the cost of employing our Union
workforce, affect our ability to continue offering market-based salaries and employee benefits, limit
our flexibility in dealing with our workforce, and limit our ability to change work rules and practices
and implement other efficiency-related improvements to successfully compete in today’s challenging
marketplace, which may negatively affect our financial condition and results of operations.

Legislative and taxing authority risk. We are subject to governmental regulation, and
compliance with local, state and federal requirements, including taxing requirements, and unforeseen
changes in or interpretations of such requirements could affect our financial condition and results of
operations.

We are subject to regulation by federal, state and local governmental authorities. We are
required to comply with a variety of laws and regulations and to obtain authorizations, permits,
approvals and certificates from governmental agencies in various aspects of our business. We cannot
predict with certainty the impact of any future revisions or changes in interpretations of existing
regulations or the adoption of new laws and regulations applicable to them. Changes in regulations or
the imposition of additional regulations could negatively influence our operating environment and
results of operations.

Additionally, changes in federal, state or local tax laws and their related regulations, or
differing interpretation or enforcement of applicable law by a federal, state or local taxing authority,
could result in substantial cost to us and negatively affect our results of operations. Tax law and its
related regulations and case law are inherently complex and dynamic. Disputes over interpretations of
tax laws may be settled with the taxing authority in examination, upon appeal or through litigation. Our
judgments may include reserves for potential adverse outcomes regarding tax positions that have been
taken that may be subject to challenge by taxing authorities. Changes in laws, regulations or adverse
judgments may negatively affect our financial condition and results of operations.

Environmental regulation risk. We are subject to environmental regulations which could

adversely affect our operations or financial results.

We are subject to laws, regulations and other legal requirements enacted or adopted by federal,
state and local governmental authorities relating to protection of the environment and health and safety
matters, including those legal requirements that govern discharges of substances into the air and water,
the management and disposal of hazardous substances and waste, the clean-up of contaminated sites,
groundwater quality and availability, plant and wildlife protection, as well as work practices related to
employee health and safety. Revised environmental regulations which result in increased compliance
costs or additional operating restrictions could have an adverse effect on our financial condition and
results of operations, particularly if those costs are not fully recoverable from insurance or through
utility customer rates.

27

Environmental legislation also requires that our facilities, sites and other properties associated
with our operations be operated, maintained, abandoned and reclaimed to the satisfaction of applicable
regulatory authorities. Failure to comply with these laws, regulations, permits and licenses may expose
us to fines, penalties or interruptions in our operations that could adversely affect our financial results.

Safety regulation risk. We may experience increased federal, state and local regulation of the
safety of our systems and operations, which could adversely affect our operating costs and financial
results.

The safety and protection of the public, our customers and our employees is and will remain

our top priority. We are committed to consistently monitoring and maintaining our distribution system
and storage operations to ensure that natural gas is acquired, stored and delivered safely, reliably and
efficiently. However, we anticipate companies in the natural gas distribution business may be subjected
to even greater federal, state and local regulatory oversight over the safety of their operations. We
intend to work diligently with industry associations and federal and state regulators to ensure
compliance with the new laws, such as the “Pipeline Safety, Regulatory Certainty, and Job Creation
Act of 2011” signed into law in early 2012. Although we believe these costs will ultimately be
recoverable through our rates to customers, the costs of complying with such increased regulation
could have at least a short-term negative impact on our operating costs and financial results.

Hedging risk. Our risk management policies and hedging activities cannot eliminate the risk of

commodity price movements and other financial market risks, and our hedging activities may expose
us to additional liabilities for which rate recovery may be disallowed, which could result in an adverse
impact on our operating revenues, costs, derivative assets and liabilities and operating cash flows.

In our utility segment, our gas purchasing requirements expose us to risks of commodity price
movements, while our use of debt and equity financing exposes us to interest rate, liquidity and other
financial market risks. We attempt to manage these exposures and mitigate our risks through adherence
to established risk limits and risk management procedures, including hedging activities that are in
accordance with our policy guidelines. We use both financial and physical hedging mechanisms,
including our recent gas reserve transaction in which we are acquiring long-term gas reserves through
an investment with Encana Oil & Gas (USA). These risk limits and risk management procedures may
not always work as planned and cannot entirely eliminate the risks associated with
hedging. Additionally, our hedging activities may cause us to incur additional expenses which could
adversely impact our financial condition, results of operations, and cash flows.

We do not hedge our entire interest rate or commodity cost exposure, and the unhedged
exposure will vary over time. Gains or losses experienced through hedging activities, including
carrying costs, generally flow through the PGA mechanism or are recovered in future general rate
cases, thereby limiting our exposure to earnings volatility on a year-to-year basis. However, the hedge
transactions we enter into for the utility are subject to a prudency review by the OPUC and WUTC,
and, if deemed imprudent, those expenses may be disallowed, which could have an adverse effect on
our financial condition and results of operations. In addition, actual business requirements and
available resources may vary from forecasts, which are used as the basis for our hedging decisions, and
could cause our exposure to be more or less than we anticipated. Moreover, if our derivative
instruments and hedging transactions do not qualify for hedge accounting under generally accepted
accounting standards, our hedges may not be effective and our results of operations and financial
condition could be adversely affected.

28

We also have credit-related exposure to derivative counterparties. In general, we require our

counterparties to have an investment-grade credit rating at the time the derivative instrument is entered
into, and we specify limits on the contract amount and duration based on each counterparty’s credit
rating. Nevertheless, counterparties owing us money or physical natural gas commodities could breach
their obligations. Should the counterparties to these arrangements fail to perform, we may be forced to
enter into alternative arrangements to meet our normal business requirements. In that event, our
financial results could be adversely affected. Although our valuations take into account the expected
probability of default and the potential loss due to a default by our counterparties, an actual default by
a particular counterparty could have a greater impact than we estimate. Additionally, under most of our
hedging arrangements, any downgrade of our senior unsecured long-term debt credit rating could allow
our counterparties to require us to post cash, a letter of credit or other form of collateral, which would
expose us to additional costs and may trigger significant increases in borrowing from our credit
facilities if the credit rating downgrade is below investment grade.

Inability to access capital market risk. Our inability to access capital, or significant
increases in the cost of capital, could adversely affect our financial condition and results of operations.

Our ability to obtain adequate and cost effective short-term and long-term financing depends on

maintaining investment grade credit ratings as well as the existence of liquid and stable financial
markets. Our businesses rely on access to capital markets, including commercial paper, bond and
equity markets, to finance our operations, construction expenditures and other business requirements,
and to refund maturing debt that cannot be funded entirely by internal cash flows. Disruptions in the
capital markets could adversely affect our ability to access short-term and long-term financing. Our
access to funds under committed short-term credit facilities, which are currently provided by a number
of banks, is dependent on the ability of the participating banks to meet their funding
commitments. Those banks may not be able to meet their funding commitments if they experience
shortages of capital and liquidity. Disruptions in the bank or capital financing markets as a result of
economic uncertainty, changing or increased regulation of the financial sector, or failure of major
financial institutions could adversely affect our access to capital and negatively impact our ability to
run our business and make strategic investments.

A negative change in our current credit ratings, particularly below investment grade, could
adversely affect our cost of borrowing and access to sources of liquidity and capital. Such a downgrade
could further limit our access to borrowing under available credit lines. Additionally, downgrades in
our current credit ratings below investment grade could cause additional delays in accessing the capital
markets by the utility while we seek supplemental state regulatory approval, which could hamper our
ability to access credit markets on a timely basis. A credit downgrade could also require additional
support in the form of letters of credit, cash or other forms of collateral and otherwise adversely affect
our financial condition and results of operations.

Changes in accounting standards. Changes in accounting standards may adversely impact

our financial condition and results of operations.

Our business is currently subject to accounting standards issued by the Financial Accounting

Standards Board. Changes in these standards could adversely impact our financial condition or results
of operations. Recently, the SEC has been considering whether issuers in the United States should be
required to prepare financial statements in accordance with International Financial Reporting Standards
(IFRS) instead of the current generally accepted accounting principles (GAAP) in the United States.

29

IFRS is a comprehensive set of accounting standards promulgated by the International Accounting
Standards Board (IASB), which are currently in effect for most other countries in the world. If the SEC
decides to adopt IFRS, we expect that U.S. companies would not be required to report under these new
standards until 2015 or 2016 at the earliest. Unlike U.S. GAAP, IFRS does not currently provide an
industry accounting standard for rate-regulated activities. As such, if IFRS were adopted in its current
state, we may be precluded from applying certain regulatory accounting principles, including the
recognition of certain regulatory assets and regulatory liabilities. The potential issues associated with
rate-regulated accounting, along with other potential changes associated with the adoption of IFRS,
may have a significant impact on our financial condition and results of operations. Also, the U.S.
Financial Accounting Standards Board is considering several changes to U.S. GAAP, some of which
may be significant, as part of a joint effort with the IASB to converge accounting standards over the
next several years. If approved, adoption of these changes may adversely impact our financial
condition and results of operations.

Risks Related Primarily to Our Local Utility Business

Gas price risk. Higher natural gas commodity prices and volatility in the price of gas may

adversely affect our results of operations and cash flows.

The cost of natural gas is affected by a variety of factors, including weather, changes in
demand, the level of production and availability of natural gas supplies, imports and exports of natural
gas, transportation constraints, availability of pipeline capacity, transportation capacity cost increases,
federal and state energy and environmental regulation and legislation, the degree of market liquidity,
supply disruption, natural disasters, wars and other catastrophic events, national and worldwide
economic and political conditions, and the price and availability of alternative fuels. In our utility
segment, the cost we pay for natural gas at the utility is generally passed through to our customers
through an annual PGA rate adjustment. Recent years have seen a substantial decline in natural gas
prices as new drilling technologies have been employed to produce abundant U.S. supplies of natural
gas. If this trend in commodity prices were to reverse and thereby result in significant increases in the
commodity price of natural gas, it would raise the cost of energy to our utility customers, potentially
causing those customers to conserve or switch to alternate sources of energy. Significant price
increases could also cause new home builders and commercial developers to select heating systems
other than natural gas. Decreases in the volume of gas we sell could reduce our earnings in the absence
of decoupled rate structures, and a decline in customers could slow growth in our future earnings.

Higher gas prices may also cause us to experience an increase in short-term debt and

temporarily reduce liquidity because we pay suppliers for gas when it is purchased, which can be
several months or even a year in advance of when these costs are recovered through rates. Significant
increases in the price of gas can also slow our collection efforts as customers experience increased
difficulty in paying their higher energy bills, leading to higher than normal delinquent accounts
receivable. This could contribute to higher short-term debt levels, greater expense associated with
collection efforts and increased bad debt expense.

In Oregon and Washington, our utility has PGA tariffs which provide for annual revisions in
rates resulting from changes in the cost of purchased gas including the expected impact on bad debt
expense. The Oregon PGA tariff provides an incentive to the Company to achieve lower gas costs such
that a small percentage, set annually, of any cost savings (i.e. the difference between the estimated
average PGA gas cost in rates and the actual average gas cost incurred) be recognized as current

30

income or expense. Accordingly, higher average gas costs than those assumed in setting rates can
adversely affect our operating cash flows, liquidity and results of operations. Notwithstanding our
current rate structure, higher gas costs could result in increased pressure on the OPUC or the WUTC to
seek other means to reduce rates, which also could adversely affect our results of operations and cash
flows.

Customer growth risk. Our utility margin, earnings and cash flow may be negatively affected

if we are unable to sustain customer growth rates in our local gas distribution segment.

Our utility margins and earnings growth have largely depended upon the sustained growth of
our residential and commercial customer base due, in part, to the new construction housing market,
conversions of customers to natural gas from other fuel sources and growing commercial use of natural
gas. Continued weakness in the residential new construction and conversion markets, and continued
decline in average use of natural gas by our residential and commercial customers, could result in an
adverse long-term impact on our utility margin, earnings and cash flows.

Risk of competition. Our gas distribution business is subject to increased competition which

could negatively affect our results of operations.

In the residential market, our gas distribution business competes primarily with suppliers of

electricity, fuel oil, propane, and renewable energy providers. We also compete with suppliers of
electricity, fuel oil and renewable energy providers for commercial applications. In the industrial
market, we compete with suppliers of all forms of energy, including oil, electricity, renewable energy
providers and, as it relates to sources of energy for electric power plants, coal and hydro. Competition
among these forms of energy is based on price, efficiency, reliability, performance, market conditions,
technology, environmental impacts and public perception.

Higher natural gas prices have at times eroded, or in some cases eliminated, the competitive

price advantage of natural gas over other energy sources. Technological improvements in other energy
sources such as heat pumps could also erode our competitive advantage. If natural gas prices rise
relative to other energy sources, or if the cost or environmental impact of other energy sources
improves relative to natural gas, it may negatively affect our ability to attract new customers or retain
our existing residential, commercial and industrial customers, which could have a negative impact on
our customer growth rate and results of operations.

Reliance on third parties to supply natural gas risk. We rely on third parties to supply
substantially all of the natural gas in our distribution segment, and limitations on our ability to obtain
supplies, or failure to receive expected supplies for which we have contracted, could have an adverse
impact on our financial results.

Our ability to secure natural gas for current and future sales depends upon our ability to

purchase and receive delivery of supplies of natural gas from third parties, as well as our ability to
acquire supplies directly from new sources. Certain factors including the following may affect our
ability to acquire and deliver natural gas to our current and future customers: suppliers’ or other third
parties’ control over drilling of new wells and operating facilities to transport natural gas to our
distribution system; competition for the acquisition of natural gas; priority allocations on transmission
pipelines; impact of severe weather disruptions to natural gas supplies; failure of third parties to deliver
gas for which we have contracted; the regulatory and pricing policies of federal, state and local

31

government agencies; and the availability of Canadian reserves for export to the United States. If we
are unable to obtain, or are limited in our ability to obtain, natural gas from our current suppliers or
new sources, our financial results could be adversely impacted.

Single transportation pipeline risk. We rely on a single pipeline company for the

transportation of gas to our service territory, a disruption of which could adversely impact our ability
to meet our customers’ gas requirements.

Our distribution system is directly connected to a single interstate pipeline, which is owned and

operated by Northwest Pipeline. The pipeline’s gas flows are bi-directional, transporting gas into the
Portland metropolitan market from two directions: (1) the north, which brings supplies from the British
Columbia and Alberta supply basins; and (2) the east, which brings supplies from the Alberta and the
U.S. Rocky Mountain supply basins. If there is a rupture or inadequate capacity in the pipeline, we
may not be able to meet our customers’ gas requirements and we would likely incur costs associated
with actions necessary to mitigate service disruptions, both of which could significantly and negatively
impact our results of operations.

Weather risk. Warmer than average weather or a failure to renew our weather normalization

mechanism may have a negative impact on our revenues and results of operations.

We are exposed to weather risk primarily in our utility segment. A majority of our volume is
driven by gas sales to space heating residential and commercial customers during the winter heating
season. Current utility rates are based on an assumption of average weather. Warmer than average
weather typically results in lower gas sales. Colder weather typically results in higher gas
sales. Although the effects of warmer or colder weather on utility margin in Oregon are expected to be
mitigated through the operation of our weather normalization mechanism, weather variations from
normal could adversely affect utility margin because we may be required to purchase more or less gas
at spot rates, which may be higher or lower than the rates assumed in our PGA. Also, approximately 9
percent of our Oregon residential and commercial customers have opted out of the weather
normalization mechanism, and 10 percent of our customers are located in Washington where we do not
have a weather normalization mechanism. Furthermore, continuation of the weather normalization
mechanism in Oregon after October 2012 is subject to regulatory approval. As a result, we may not be
fully protected against warmer than average or colder than average weather, both of which may have
an adverse effect on our financial condition, results of operations and cash flows.

Customer conservation risk. Customers’ conservation efforts or a failure to renew our

conservation tariff may have a negative impact on our revenues.

An increasing national focus on energy conservation, including improved building practices

and appliance efficiencies, may result in increased energy conservation by customers, which can
decrease our sales of natural gas and adversely affect our results of operations. In Oregon, we have a
conservation tariff which is designed to recover lost margin due to declines in residential and
commercial customers’ consumption. The conservation tariff is scheduled to expire in October
2012. The failure of the OPUC to extend the conservation tariff in the future could adversely affect our
financial condition, results of operations and cash flows. We do not have a conservation tariff in
Washington, so our results of operations are negatively affected by increasing conservation efforts.

Business improvements risk. Our efforts to integrate, consolidate and streamline our
operations have resulted in increased reliance on technology, the failure or security breach of which
could adversely affect our financial condition and results of operations.

32

Over the last several years we have undertaken a variety of initiatives to integrate, standardize,

centralize and streamline our operations. These efforts have resulted in greater reliance on
technological tools such as: an enterprise resource planning system, which provides an integrated suite
of business application software; an automated dispatch system, which provides integrated planning,
scheduling and dispatching of field resources; an automated meter reading system, which allows for
electronic reading of customers meters; a customer information system, which allows us to calculate
and bill customers for gas service including adjustments such as the weather normalization impact; and
other similar technological tools and initiatives. The failure of any of these or other similarly important
technologies, or our inability to have these technologies supported, updated, expanded or integrated
into other technologies, could adversely impact our operations. Although we have, when possible,
developed alternative sources of technology and built redundancy into our computer networks and
tools, there can be no assurance that these efforts to date would protect us against all potential issues or
disaster occurrences related to the loss of any such technologies or their use.

Furthermore, our operations are subject to cyber-security risks related to breaches in
technologies that are used in our natural gas distribution and storage operations and other business
processes. Additionally, our utility is subject to breaches of security pertaining to sensitive customer,
employee and vendor information maintained by the utility in the normal course of business. Although
we have preventive and detective measures in place to reduce the risk of such security breaches, they
could occur and result in a loss of confidential or proprietary data or security breaches of other
technology business tools, which could adversely affect the utility’s reputation, diminish customer
confidence, disrupt operations, and subject us to possible financial liability or increased regulation or
litigation, any of which could adversely affect our financial condition and results of operations.

Risks Related Primarily to Our Gas Storage Business

Long-term stabilization of gas price risk. Any significant stabilization of natural gas prices

could have a negative impact on the demand for our natural gas storage services, which could
adversely affect our financial results.

Storage businesses benefit from price volatility, which impacts the level of demand for services

and the rates that can be charged for storage services. On a system-wide basis, natural gas is typically
injected into storage between April and October when natural gas prices are generally lower and
withdrawn during the winter months of November through March when natural gas prices are typically
higher. However, the market for natural gas may not continue to experience volatility and seasonal
price sensitivity in the future at the levels previously seen. Largely due to the abundant supply of
natural gas made available by hydraulic fracturing techniques, natural gas prices have dropped
significantly to levels that are near a 10-year low. If prices and volatility remain low or decline further,
then the demand for storage services, and the prices that we will be able to charge for those services,
may decline or be depressed for a prolonged period of time. A sustained decline in these prices could
have an adverse impact on our financial condition, results of operations and cash flows.

Natural gas storage competition risk. Increasing competition in the natural gas storage

business could reduce the demand for our storage services and drive prices down for storage, which
could adversely affect our financial condition, results of operation and cash flows.

Our natural gas storage segment competes primarily with other storage facilities and pipelines.

Natural gas storage is an increasingly competitive business, with ongoing expansions and proposed

33

construction of new storage capacity in California, the U.S. Rocky Mountains and elsewhere in the
United States and Canada. Increased competition in the natural gas storage business could reduce the
demand for our natural gas storage services, drive prices down for our storage business, and adversely
affect our ability to renew or replace existing contracts at rates sufficient to maintain current revenues
and cash flows, which could adversely affect our financial condition, results of operations and cash
flows.

Third-party pipeline risk. Our gas storage business depends on third-party pipelines that
connect our storage facilities to interstate pipelines, the failure or unavailability of which could
adversely affect our financial condition, results of operations and cash flows.

Our gas storage facilities are reliant on the continued operation of a third-party pipeline and

other facilities that provide delivery options to and from our storage facilities. Because we do not own
all of these pipelines, their operation is not within our control. If the third-party pipeline to which we
are connected were to become unavailable for current or future withdrawals or injections of natural gas
due to repairs, damage to the infrastructure, lack of capacity or other reason, our ability to operate
efficiently and satisfy our customers’ needs could be compromised, thereby potentially could have an
adverse impact on our financial condition, results of operations and cash flows.

Operations at new storage facility risk. Operations at our new Gill Ranch storage facility
involves numerous operational risks that may result in a failure to meet expectations or contractual
obligations, additional or unexpected costs and other business risks that could adversely impact our
financial condition, results of operations and cash flows.

In October 2010, we commenced operations at our Gill Ranch storage facility. Operations at a

new storage facility involve many risks. Although we believe that Gill Ranch has been successfully
completed to meet our contractual obligations and project specifications with respect to injection,
withdrawal and gas specifications, the facility is new, has a limited operating history, and is not
expected to reach full design capacity until the end of 2012. If we fail to achieve design capacity, inject
or withdraw natural gas at the levels we expect or at contracted rates, or cannot deliver natural gas
consistent with our expectations or contractual specifications, or otherwise operate as expected, or if
operating costs are substantially higher than we expect or if we fail to control those costs, we may not
be able to contract for storage at the levels and on the terms we expect, and we could incur higher than
expected costs to satisfy our contractual obligations under contracts we obtain, and this could adversely
impact our financial condition, results of operations and cash flows.

ITEM 1B. UNRESOLVED STAFF COMMENTS

We have no unresolved comments.

ITEM 2. PROPERTIES

Utility Properties

Our natural gas pipeline system consists of approximately 13,900 miles of distribution and

transmission mains located in our service territory in Oregon and Washington. In addition, the piping
system includes service pipelines, meters and regulators, and gas regulating and metering stations.
Pipeline mains are located in municipal streets or alleys pursuant to valid franchise or occupation

34

ordinances, in county roads or state highways pursuant to valid agreements or permits granted pursuant
to statute, or on lands of others pursuant to valid easements obtained from the owners of such lands.
We also hold all necessary permits for the crossing of numerous navigable waterways and smaller
tributaries throughout our entire service territory.

We own service building facilities in Portland, as well as various satellite service centers,

garages, warehouses and other buildings necessary and useful in the conduct of our business. We also
lease office space in Portland for our corporate headquarters, which expires on May 31, 2018.
Resource centers are maintained on owned or leased premises at convenient points in the distribution
system to provide service within our utility service territory. We also own LNG storage facilities in
Portland and near Newport, Oregon.

In order to reduce risks associated with gas leakage in older parts of our system, we undertook

an accelerated pipe replacement program under which we removed and replaced 100 percent of our
cast iron mains by the end of 2000. In 2001, we initiated an accelerated pipe replacement program
under which we expect to eliminate all bare steel mains and services in the system by 2021.

Gas Storage Properties

We hold leases and other property interests in approximately 11,300 net acres of underground
natural gas storage in Oregon and approximately 5,000 net acres of underground natural gas storage in
California, and easements and other property interests related to pipelines associates with those
facilities. We own rights to depleted gas reservoirs near Mist, Oregon, that are continuing to be
developed and operated as underground gas storage facilities. We also hold an option to purchase
future storage rights in certain other areas of the Mist gas field in Oregon, as well as in California
related to the Gill Ranch storage project.

We consider all of our properties currently used in our operations, both owned and leased, to be

well maintained, in good operating condition, and, along with planned additions, adequate for our
present and foreseeable future needs.

Our Mortgage and Deed of Trust is a first mortgage lien on substantially all of the property

constituting our utility plant.

ITEM 3. LEGAL PROCEEDINGS

Other than the proceedings disclosed in Note 15 and as discussed below, we have only

nonmaterial litigation in the ordinary course of business.

In December 2010, NW Natural commenced litigation against certain of its historical liability

insurers in Multnomah County Circuit Court, State of Oregon, Case Number 1012-17532. The
defendants include Associated Electric & Gas Insurance Services Limited, Allianz Global Risk US
Insurance Company, certain underwriters at Lloyd’s London, certain London market insurance
companies and 10 other insurance companies. In the suit, NW Natural alleges that the defendant
insurance companies issued third party liability insurance policies to NW Natural and that the
defendants have breached the terms of those policies by failing to reimburse and indemnify NW
Natural for liabilities arising from environmental contamination at certain sites caused or alleged to be
caused by its historical operations. NW Natural seeks damages in excess of $50 million in losses it has

35

incurred to date, as well as declaratory relief for additional losses it expects to incur in the future. In
December 2011, NW Natural reached a settlement with Associated Electric & Gas Insurance Services
Limited and dismissed that insurer from the litigation.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

36

PART II

ITEM 5. MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER

MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

(A) Our common stock is listed and trades on the New York Stock Exchange under the

symbol “NWN.”

The high and low trades for our common stock during the past two years were as follows:

Quarter Ended

March 31
June 30
September 30
December 31

2011

High

$48.72
46.40
46.77
48.98

Low

$43.92
43.57
39.63
42.52

2010

High

$47.54
49.18
49.00
50.86

Low

$41.05
41.90
42.63
44.02

The closing quotations for our common stock on December 31, 2011 and 2010 were $47.93 and

$46.47, respectively.

(B) As of December 31, 2011, there were 6,745 holders of record of our common stock.

(C) We have paid quarterly dividends on our common stock in each year since the stock first

was issued to the public in 1951. Annual common dividend payments per share, adjusted for stock
splits, have increased each year since 1956. Dividends per share paid during the past two years were as
follows:

Payment Date

February 15
May 15
August 15
November 15

Total per share

2011

$0.435
0.435
0.435
0.445

$1.750

2010

$0.415
0.415
0.415
0.435

$1.680

The amount and timing of dividends payable on our common stock are within the sole
discretion of our Board of Directors. Subject to Board approval, we expect to continue paying cash
dividends on our common stock on a quarterly basis. However, the declaration and amount of future
dividends depend upon our earnings, cash flows, financial condition and other factors.

37

(D) The following table provides information about purchases of our equity securities that are

registered pursuant to Section 12 of the Securities Exchange Act of 1934 during the quarter ended
December 2011:

ISSUER PURCHASES OF EQUITY SECURITIES

(a)

(b)

Total Number
of Shares
Purchased (1)

Average
Price Paid
per Share

(c)
Total Number of Shares
Purchased as Part of
Publicly Announced
Plans or Programs (2)

(d)
Maximum Dollar Value of
Shares that May Yet Be
Purchased Under the
Plans or Programs (2)

-
3,262
-

3,262

-
$
$47.00
-
$

$47.00

2,124,528
-
-
-

2,124,528

$16,732,648
-
-
-

$16,732,648

Period

Balance forward
10/01/11-10/31/11
11/01/11-11/30/11
12/01/11-12/31/11

Total

(1) During the quarter ended December 31, 2011, 3,262 shares of our common stock were purchased on the
open market to meet the requirements of our deferred compensation programs. During the quarter ended
December 31, 2011, no shares of our common stock were accepted as payment for stock option exercises
pursuant to our Restated Stock Option Plan.

(2) We have a share repurchase program under which we purchase NWN common stock on the open market or
through privately negotiated transactions. The program is currently authorized by the Board through
May 31, 2012, with approval to repurchase up to an aggregate of 2.8 million shares or up to an aggregate of
$100 million. During the quarter ended December 31, 2011, no shares of our common stock were
repurchased pursuant to this program. Since the program’s inception in 2000, we have repurchased
approximately 2.1 million shares of common stock at a total cost of approximately $83.3 million.

38

ITEM 6. SELECTED FINANCIAL DATA

Thousands, except per share amounts

2011

For the year ended December 31,
2008
2009
2010

2007

Net operating revenues
Net income
Earnings per share of common stock:

Basic
Diluted

Dividends paid per share of common stock
Total assets—at end of period
Common stock equity
Long-term debt

$ 369,433
63,898

$ 367,581
72,667

$ 376,887
75,122

$ 356,215
69,525

$ 369,042
74,497

2.39
2.39
1.75
2,746,574
714,488
641,700

2.73
2.73
1.68
2,616,616
693,101
591,700

2.83
2.83
1.60
2,399,252
660,105
601,700

2.63
2.61
1.52
2,378,152
628,373
512,000

2.78
2.76
1.44
2,014,061
594,751
512,000

39

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

RESULTS OF OPERATIONS

The following is management’s assessment of Northwest Natural Gas Company’s (NW
Natural) financial condition, including the principal factors that affect results of operations. The
discussion refers to our consolidated activities for the years ended December 31, 2011, 2010, and 2009.
Unless otherwise indicated, references in this discussion to “Notes” are to the Notes to Consolidated
Financial Statements in this report.

The consolidated financial statements include the accounts of NW Natural and its direct and

indirect wholly-owned subsidiaries which include: Gill Ranch Storage, LLC (Gill Ranch), NW Natural
Energy, LLC (NWN Energy), NW Natural Gas Storage, LLC (NWN Gas Storage), and NNG Financial
Corporation (NNG Financial). These statements also include accounts related to an equity investment
in Palomar Gas Holdings, LLC (PGH), which is pursuing the development of a proposed natural gas
pipeline through its wholly-owned subsidiary Palomar Gas Transmission, LLC (Palomar). These
accounts make up our regulated local gas distribution business, our regulated gas storage businesses,
and other regulated and non-regulated investments primarily in energy-related businesses. In this
report, the term “utility” is used to describe our regulated local gas distribution business (local
distribution company), and the term “non-utility” is used to describe our regulated gas storage
businesses (gas storage) as well as our other regulated and non-regulated investments and business
activities (other). For a further discussion of our business segments, see Note 4.

In addition to presenting results of operations and earnings amounts in total, certain measures

are expressed in cents per share. These amounts reflect factors that directly impact earnings. We
believe this per share information is useful because it enables readers to better understand the impact of
these factors on consolidated earnings. All references in this section to earnings per share are on the
basis of diluted shares. We also present free cash flow as we believe this supplemental information
enables the reader of the financial statements to better understand our cash generating ability and to
benefit from seeing cash flow results from management’s perspective in addition to the traditional
GAAP presentation (see “Cash Flows—Financing Activities,” below). We use such non-GAAP (i.e.
non-generally accepted accounting principles) measures in analyzing our financial performance
because we believe that they provide useful information to our investors and creditors in evaluating
NW Natural’s financial condition and results of operations.

Executive Summary

Highlights of 2011 include:

• Consolidated earnings of $63.9 million and $2.39 per share in 2011, compared to $72.7

million and $2.73 in 2010;

• Net income from utility operations decreased $5.7 million, from $66.3 million in 2010 to

$60.5 million in 2011;

• Net income from gas storage operations decreased $2.0 million, from $6.1 million in 2010

to $4.1 million in 2011;

• Net operating revenues (margin) increased 1 percent, from $367.6 million in 2010 to $369.4

million in 2011;

• Total operating expenses increased 7 percent, from $210.0 million in 2010 to $224.6 million

in 2011;

40

• Cash flow from operations increased $107.0 million, from $126.5 million in 2010 to $233.5

million in 2011;

• Utility customer growth rate was 0.8 percent in 2011, compared to 0.9 percent in 2010; and
• Dividends paid increased 4 percent, from $1.68 per share in 2010 to $1.75 in 2011,

reflecting the 56th consecutive year of dividend increases to shareholders.

Our primary businesses consist of regulated utility and gas storage operations. Factors critical
to the success of the utility include: maintaining a safe and reliable distribution system; acquiring an
adequate supply of natural gas; providing distribution services at competitive prices; and being able to
recover our operating and capital costs in the rates charged to customers in a reasonable and timely
manner. Our utility business is regulated by two state commissions, the Public Utility Commission of
Oregon (OPUC) and the Washington Utilities and Transportation Commission (WUTC). Factors
critical to the success of our gas storage business include: developing and operating storage capacity at
competitive market prices; retaining customers and successfully marketing available storage capacity
to new customers; planning for the replacement of capacity that is expected to be recalled by the utility
to serve growing demands of its core customers; charging adequate rates to recover investment and
operating costs; and being able to obtain financing to fund expansions and working capital
requirements. Our gas storage businesses are, in part, regulated by the California Public Utilities
Commission (CPUC), the Federal Energy Regulatory Commission (FERC) and the OPUC.

2012 Outlook

In 2012, we will be focused on strengthening our core businesses, enhancing our strategic

position, advancing key business projects, and leveraging our organizational resources.

Strengthen Core Businesses. Our core businesses are local gas distribution (utility) and gas

storage. In the utility, we will continue our efforts to develop, integrate, consolidate and streamline our
operations using new technologies, which are expected to include a workforce scheduling system, a
procurement system, and an automated dispatching system. In our storage business, we will focus on
maximizing our storage capacity and optimizing our revenue opportunities. We believe that investing
in operating efficiencies and in marketing opportunities for our core businesses positions us well for
growth now and into the future as the economy recovers.

Enhance Strategic Position. We believe our core businesses are positioned strategically and
competitively. The decline in gas prices and the abundance of shale gas supplies creates opportunities
for both core businesses. Specifically, it creates opportunities for us to expand our market share in the
utility by leveraging our natural gas’ competitive price advantage. Moreover, our gas storage facilities
strategically position us to quickly respond to market demand with storage capacity when gas prices
increase or become more volatile. Together, our businesses competitively position us to meet market
demands when the economy recovers.

Advance Key Projects. We seek to create shareholder value by innovatively addressing the

needs of our customers, employees and the communities we serve while addressing economic,
regulatory and environmental challenges. To that end, we are advancing key business projects such as
acquiring long-term gas reserves on behalf of our utility customers, pursuing future storage
opportunities at Mist, and improving our operations at Gill Ranch. We also continue to pursue regional
solutions for reliable and safe energy needs through our investment in natural gas infrastructure, such
as the Palomar pipeline.

41

Leverage Resources. Our employees are our most valued resource. To support and leverage
this valuable resource, we will continue to invest in new technologies and improve our facilities. We
believe this will allow us to maintain a positive and safe work environment, to provide on-going
training and workforce development, and also to gain greater operational efficiency.

Issues, Challenges and Performance Measures

Economic weakness. Weakness in local, national and global economies continues to impact

utility customer growth, business demand for natural gas and market prices for gas storage. Our
utility’s customer growth rate remained relatively flat for the third year in a row at 0.8 percent,
compared to 0.9 percent in 2010 and 0.8 percent in 2009. The local economy is beginning to show
signs of a slow recovery as unemployment rates in Oregon and southwest Washington dropped from
approximately 10 percent in 2010 to about 9 percent at the end of 2011, and industrial demand for
natural gas increased in 2011 by 1 percent over 2010. We believe our utility is well positioned to add
customers as the economy recovers because of low and stable natural gas prices, our relatively low
market penetration, our ongoing focus on converting homes and businesses to natural gas, and the
potential for environmental initiatives that could favor natural gas use in our region.

Managing gas prices and supplies. Our gas acquisition strategy is regularly updated to secure
sufficient supplies of natural gas to meet the needs of our utility customers and to hedge gas prices so
that we can effectively manage costs, reduce price volatility and maintain a competitive advantage.
With recent developments in drilling technologies and substantial access to supplies from shale gas
formations around the U.S. and in Canada, the supply outlook for North American natural gas is
strong, which is contributing to lower and more stable gas prices.

The Purchased Gas Adjustment (PGA) mechanisms in Oregon and Washington, along with our
gas price hedging strategies, including gas reserves and storage supplies, enable us to reduce earnings
exposure for the company and secure lower gas costs for our customers. These lower gas prices,
coupled with our focus on customer service and cost-effective energy efficiency programs, can help
strengthen natural gas’ competitive advantage over other energy sources in key markets.

We typically hedge gas prices on approximately 75 percent of our anticipated year-round sales
volumes based on normal weather. For the 2011-12 gas year (November 1, 2011 – October 31, 2012),
we entered the gas year hedged at a level of approximately 75 percent of our forecasted sales volumes,
including 51 percent financially hedged and 24 percent physically hedged with a combination of gas
inventories in storage, local production from the Mist area, and production of gas reserves from our
investment with Encana Oil & Gas (USA) Inc. (Encana). The production of gas reserves is related to a
new investment we made beginning in 2011 to hold working interests in leases related to both currently
producing and new wells in Encana’s Jonah gas field located in Rock Springs, Wyoming. For further
discussion of gas reserves, see Investments in Gas Reserves under Strategic Opportunities below and
Gas Reserves under Rate Mechanisms below.

In addition to the amount of gas hedged for the current gas contract year, we are also hedged at

approximately 32 percent for the 2012-13 gas year and between 9 and 13 percent hedged for annual
requirements over the following five gas years. Our hedge levels are subject to change based on actual
load volumes, which depend to a certain extent on weather and economic conditions. Also, our storage
levels may increase or decrease based on storage expansion or storage recall by the utility. As for gas
reserves, these levels are estimates of production, which are subject to change based on possible
unforeseen events that include the impact from speed of drilling and the volume of production.

42

Although stable gas prices provide opportunities to manage costs for our utility customers, they

also present challenges for our gas storage business. Stable natural gas prices may reduce the pricing
for storage services. We are focused on improving the results from our gas storage businesses.

Environmental costs. We accrue all material environmental loss contingencies related to our

properties that require environmental investigation or remediation. Due to numerous uncertainties
surrounding the preliminary nature of investigations or the developing nature of remediation
requirements, actual costs could vary significantly from our loss estimates. As a regulated utility, we
are allowed to defer certain costs pursuant to regulatory decisions. We currently have regulatory
approval to defer certain environmental costs, and to seek recovery of these amounts in future rates to
customers. However, we are expected to pursue recovery from insurance policies and only seek
recovery from customers for amounts not covered by insurance. Ultimate recovery of environmental
costs, either from regulated utility rates or from insurance, will depend on our ability to effectively
manage costs and demonstrate that costs were prudently incurred. Recovery may vary significantly
from amounts currently recorded as regulatory assets, and amounts not recovered would be required to
be charged to income in the period they were deemed to be unrecoverable. See Note 15.

Climate change. We recognize that our businesses are likely to be impacted by future carbon

constraints, and we are seeking clean energy growth opportunities that position us for long-term
success in a lower carbon energy economy and to advance our customers’ interests in energy
conservation, efficiency and environmental stewardship. A variety of federal, state, local and
international climate change initiatives, including new regulations, are underway, but we cannot
determine the impact of these initiatives at this time. For example, an array of Environmental
Protection Agency (EPA) rules impacting coal plants may cause some coal plants to shut down early
although the EPA is not mandating coal plant closures. Coal plant shut downs could increase the
demand for natural gas as a lower carbon emission fuel and create opportunities for us. Similarly,
because natural gas has a relatively low carbon content, it is also possible that future carbon constraints
could create additional demand for natural gas for base load electric generation, direct use in homes
and businesses, backing up intermittent renewable resources and as a transportation fuel to displace
gasoline and diesel. Under EPA’s greenhouse gas reporting rules adopted in 2009, we report system
throughput to the EPA on an annual basis. The first report under these provisions was due to EPA in
September 2011. EPA also issued additional greenhouse gas reporting regulations in 2010, which
required mandatory reporting of unintended greenhouse gas releases from petroleum and natural gas
facilities. The first report is due under these rules in September 2012. While our CO2 equivalent
emission levels are relatively small, the adoption and implementation of any regulations imposing
reporting obligations, or limiting emissions of greenhouse gases associated with our operations, could
result in an increase in the prices we charge our customers or a decline in the demand for natural gas.

Performance measures. In order to deal with the challenges affecting our businesses, we

annually review and update our strategic plan to map out a course for the next several years. Our plan
includes strategies for: further improving our utility gas distribution system; enhancing utility services
and operations; optimizing and growing our non-utility gas storage businesses; investing in natural gas
infrastructure projects when necessary to support the energy needs of our region; and maintaining a
leadership role within the gas utility industry by addressing long-term energy policies and pursuing
business opportunities that support new clean energy technologies. We intend to measure our
performance and monitor progress on relevant metrics including, but not limited to: earnings per share
growth; total shareholder return; return on invested capital; utility return on equity; utility customer
satisfaction ratings; utility margin; utility capital and operations and maintenance expense per
customer; and earnings before interest, taxes, depreciation and amortization and (EBITDA).

43

Strategic Opportunities

Business Process Improvements. We continue to evaluate, develop and implement business

strategies to improve operational efficiencies and respond to economic and competitive challenges.
Over the last few years, our efforts have been to develop, integrate, consolidate and streamline
operations, while supporting our employees with training and new technology tools.

From 2006 through 2010, we reduced staffing levels in response to work load declines related
to the low customer growth environment and efficiency improvements, resulting in a reduction of full-
time, utility positions from over 1,300 in early 2006 to about 1,050 at the end of 2011. Technology
investments, workforce reductions and other initiatives have contributed to a significant increase in
productivity. The number of utility customers served per operating employee increased by 32 percent,
from 738 at the end of 2005 to 976 at the end of 2011. These efforts are expected to contribute to long-
term operational efficiencies and lower operating and capital costs throughout NW Natural. However,
we continue to look for new ways to improve our business as service demands and system safety
requirements increase and we remain committed to increasing shareholder value.

Gas Storage Development. We own and operate two underground gas storage facilities—the

Mist facility in Oregon and the Gill Ranch facility in Fresno, California. Our wholly-owned subsidiary,
Gill Ranch, holds a 75 percent undivided ownership interest in the Gill Ranch facility, with Pacific Gas
and Electric Company (PG&E) owning the other 25 percent interest. The initial development of Gill
Ranch was designed to provide us with 15 Bcf of gas storage capacity by the end of 2012, with
pipeline capacity on 27 miles of gas transmission pipeline connecting the Gill Ranch facility to an
interconnect on PG&E’s transmission system. See Note 4.

Due to an abundant supply of natural gas and lower, more stable prices in North America,
current storage values are expected to remain low in the near term, which will likely affect the prices at
which Gill Ranch is able to contract. Gas prices have hit a 10-year low and this has resulted in certain
natural gas producers reducing their levels of exploration and production. At the same time, we expect
these lower gas prices to increase demand for natural gas as the pricing provides a competitive
advantage over alternative fuel sources including potential demand for exporting natural gas.
Combined, these forces may ultimately result in upward pressure on gas prices and return some price
volatility to natural gas markets.

Our storage facilities help position us to capitalize on rising demand, increasing gas prices or

greater market volatility because storage operations benefit from seasonal swings in commodity pricing
and market volatility. Additionally, if market demand increases and we are able to obtain financing and
regulatory permits, we have the ability to expand the Gill Ranch facility beyond its current capacity
without further expansion of our gas transmission pipeline. We estimate that the current Gill Ranch
storage facility could support an aggregate storage capacity of around 40 Bcf with certain infrastructure
modifications, of which we would have the rights to 50 percent of the total.

The Pacific Northwest storage markets also are impacted by lower gas prices and lack of gas

price volatility, although less than California markets primarily because of fewer regional competitors.
Nevertheless, we continue to plan for expansion of our gas storage facilities at Mist in anticipation of
increased natural gas demand for electric generation in the Pacific Northwest. Currently we do not
have a set timeline for development, but we believe the earliest timeframe for completing the next Mist
expansion is 2016. In the meantime, we expect to continue working on preliminary design and project
scope, which will most likely include the development of storage wells, a second compression
station and additional pipeline gathering facilities that would enable future storage expansions.

44

Pipeline Diversification. Currently, our utility operations and gas storage operations at Mist

depend on a single bi-directional interstate transmission pipeline to ship gas supplies. Palomar, a
wholly-owned subsidiary of PGH, is pursuing the development of a new gas transmission pipeline that
would provide an interconnection with our utility distribution system. PGH is owned 50 percent by our
NWN Energy subsidiary and 50 percent by TransCanada American Investments Ltd., an indirect
wholly-owned subsidiary of TransCanada Corporation. The Palomar pipeline was originally proposed
with an east and a west segment, but Palomar currently plans to design and develop an east-only
pipeline to serve our utility customers as well as growing natural gas markets in Oregon and other parts
of the Pacific Northwest. In the second quarter of 2011, Palomar determined it should discontinue
efforts to develop the west segment of the pipeline after the supporting shipper declared bankruptcy.
As a result, we recorded a charge of $0.3 million for our portion of the unrecovered costs related to the
west segment.

Regarding the proposed east pipeline segment, Palomar negotiated a non-binding memorandum

of understanding with The Williams Companies’ Northwest Pipeline (Northwest Pipeline), which
contemplates Northwest Pipeline becoming a part owner in the Palomar project. This joint agreement
would consolidate the region’s efforts to develop a cross-Cascades pipeline around the use of the
Palomar route. Northwest Pipeline owns and operates the single bi-directional pipeline that connects to
NW Natural’s utility distribution system.

The proposed east segment pipeline would be regulated by FERC. In March 2011, Palomar

withdrew its original application with FERC for the proposed pipeline in Oregon, but at the same time
informed FERC that it intends to file a new application with a modified scope that excludes the west
segment, after it has conducted a new open season to obtain commercial support for the east segment.
The timing for when the Palomar pipeline is expected to be built and placed into service will be
dependent upon regulatory permits and commercial support from shippers.

In the fourth quarter of 2011, we recorded a charge of $1.0 million related to the investment in
the east segment of the project. This charge was for costs that were determined to be less than probable
of recovery in a FERC rate making proceeding because they might be deemed outdated when we refile
with FERC. Our investment balance in Palomar at December 31, 2011 after the charge was $13.5
million, which represents our share of Palomar’s development costs related to the east segment. See
Note 12 and see also “Financial Condition—Cash Flows—Investing Activities,” below for further
discussion on the status of Palomar.

Gas Reserves. In addition to hedging gas prices with financial derivative contracts, we recently

signed an agreement with Encana to acquire physical gas supplies to meet a portion of our Oregon
utility customers’ requirements over 30 years. During the first 10 years, we forecast the volumes of gas
received under the Encana agreement to provide approximately 8 to 10 percent of the average annual
requirements of our utility customers. Under the agreement, we expect to invest approximately $45
million to $55 million per year for five years, with our total investment expected to be about $250
million. We pay a fixed portion of drilling costs per well. Encana assigns to us working interests in
leases to certain sections of the Jonah gas field, located near Rock Springs, Wyoming. These sections
include both future and currently producing wells. The working interests will entitle us to receive a
portion of the gas produced in these sections. Operation of the wells will be governed by a joint
operating agreement under which Encana will be the operator, and we will pay our proportionate share
of operating costs. See Results of Operations—Regulatory Matters—Rate Mechanisms—Gas Reserves
below and 2012 Outlook—Issues, Challenges and Performance Measures—Managing gas prices and
supplies above.

45

Consolidated Earnings and Dividends

Consolidated net income was $63.9 million, or $2.39 per share, for the year ended
December 31, 2011, compared to $72.7 million, or $2.73 per share, and $75.1 million, or $2.83 per
share, for the years ended December 31, 2010 and 2009, respectively. Consolidated earnings decreased
in fiscal year 2011 primarily due to the loss of income from the repeal of Oregon’s legislative rule on
utility income tax true up, a refund of utility property taxes in 2010, and a lower earnings contribution
from our gas storage segment, which includes the first full year of operations for subsidiaries Gill
Ranch and NWN Gas Storage. These decreases were partially offset by increased margin results from
sales and transportation revenues reported by our utility gas distribution business. Consolidated returns
on average stockholders’ equity for these three years were 9.1 percent, 10.7 percent and 11.7 percent,
respectively. See “Application of Critical Accounting Policies and Estimates—Regulatory
Accounting” for a discussion of the legislative rule.

2011 compared to 2010:

The most significant factors contributing to the $8.8 million decrease in consolidated net

income were:

•

•

•

•

a $7.2 million net charge against utility margin taken in 2011, plus the $7.7 million of
margin revenues accrued in 2010, related to the repeal of Oregon’s legislative rule on utility
income taxes. See “Results of Operations—Business Segments—Utility Operations—
Regulatory Adjustment for Income Taxes Paid,” below for further explanation;
a $5.4 million increase in general taxes, primarily due to a $5.2 million refund of utility
property taxes received in 2010, partially offset by a $0.9 million decrease in other taxes at
the utility, and a $1.3 million increase in property and other taxes at Gill Ranch;
a $4.9 million increase in depreciation and amortization expense, due to a $1.2 million
increase at the utility and a $3.7 million increase at Gill Ranch; and
a $4.3 million increase in operations and maintenance expense, primarily due to a $3.2
million increase at Gill Ranch reflecting first-year operating expenses.

Partially offsetting the above factors were:

•

•

an $11.3 million increase in utility margin attributable to an increase in customers gas use,
reflecting gains from colder weather, customer growth and a slight increase in industrial
demand; and
a $6.1 million decrease in income tax expense related to lower taxable income.

2010 compared to 2009:

The most significant factors contributing to the $2.4 million decrease in consolidated net

income were:

•

•

•

a $13.5 million decrease in utility margin from the regulatory gas cost incentive sharing
mechanism, which reflects gains of $15.1 million in 2009 compared to gains of $1.6 million
in 2010;
a $2.9 million net loss from Gill Ranch, and a $0.6 million net loss from NWN Gas Storage,
primarily reflecting higher operating expenses related to start-up activities;
a $2.8 million increase in income tax expense primarily reflecting higher taxable income
from the utility, including higher amortization of regulatory tax balances related to pre-1981
assets which are offset by increased revenues collected in utility margin; and

46

•

a $1.9 million increase in interest expense primarily reflecting the full year effect of lower-
rate short-term debt refinanced with higher-rate long-term debt during 2009 and higher
balances of total debt outstanding.

Partially offsetting the above factors were:

•

•

•

a $14.3 million decrease in utility operating expenses primarily due to lower property tax,
payroll, bad debt, and employee benefit costs;
a $5.0 million increase in utility margin from residential and commercial customers, after
adjustments for weather and decoupling mechanisms, primarily due to colder weather
benefits in the second quarter of 2010 when weather normalization was not in effect,
customer growth and the rate recovery of higher income tax expenses related to an increase
in Oregon tax rates and the accelerated amortization of regulatory tax assets; and
a $3.4 million increase in other income primarily due to higher carrying costs from utility
deferred regulatory account balances and interest income from a utility property tax refund,
partially offset by a decrease in non-utility gains from company-owned life insurance.

Dividends paid on our common stock were $1.75 per share in 2011, compared to $1.68 per

share in 2010 and $1.60 per share in 2009. The Board of Directors declared a quarterly dividend on our
common stock of 44.5 cents per share, payable on February 15, 2012, increasing the indicated annual
dividend rate to $1.78 per share.

Application of Critical Accounting Policies and Estimates

In preparing our financial statements using generally accepted accounting principles in the

United States of America (U.S. GAAP), management exercises judgment in the selection and
application of accounting principles, including making estimates and assumptions that affect reported
amounts of assets, liabilities, revenues, expenses and related disclosures in the financial
statements. Management considers our critical accounting policies to be those which are most
important to the representation of our financial condition and results of operations and which require
management’s most difficult and subjective or complex judgments, including accounting estimates that
could result in materially different amounts if we reported under different conditions or used different
assumptions. Our most critical estimates and judgments include accounting for:

•
•
•
•
•
•

regulatory cost recovery and amortizations;
revenue recognition;
derivative instruments and hedging activities;
pensions and postretirement benefits;
income taxes; and
environmental contingencies.

Management has discussed its current estimates and judgments used in the application of

critical accounting policies with the Audit Committee of the Board. Within the context of our critical
accounting policies and estimates, management is not aware of any reasonably likely events or
circumstances that would result in materially different amounts being reported. For a description of
recent accounting pronouncements that could have an impact on our financial condition, results of
operations or cash flows, see Note 2.

47

Regulatory Accounting

Our utility is regulated by the OPUC and WUTC, which establish the rates and rules governing
utility services provided to customers, and, to a certain extent, set forth special accounting treatment for
certain regulatory transactions. In general, we use the same accounting principles as non-regulated
companies reporting under U.S. GAAP. However, authoritative guidance for regulated operations
(regulatory accounting) require different accounting treatment for regulated companies to show the effects
of such regulation. For example, we account for the cost of gas using a PGA deferral and cost recovery
mechanism, which is submitted for approval annually to the OPUC and WUTC (see “Results of
Operations—Regulatory Matters—Rate Mechanisms,” below). There are other expenses and revenues that
the OPUC or WUTC may require us to defer for recovery or refund in future periods. Regulatory
accounting requires us to account for these types of deferred expenses (or deferred revenues) as regulatory
assets (or regulatory liabilities) on the balance sheet. When we are allowed to recover these expenses from,
or are required to refund them to, customers, we recognize the expense or revenue on the income statement
at the same time we realize the adjustment to amounts included in utility rates charged to customers.

The conditions we must satisfy to adopt the accounting policies and practices of regulatory

accounting, which are applicable to regulated companies, include:

•
•
•

an independent regulator sets rates;
the regulator sets the rates to cover specific costs of delivering service; and
the service territory lacks competitive pressures to reduce rates below the rates set by the
regulator.

Because our utility satisfies all three conditions, we continue to apply regulatory accounting to

our utility operations. Future accounting changes, regulatory changes or changes in the competitive
environment could require us to discontinue the application of regulatory accounting for some or all of
our regulated businesses. This would require the write-off of those regulatory assets and liabilities that
would no longer be probable of recovery from or refund to customers. Based on current accounting,
regulatory and competitive conditions, we believe that it is reasonable to expect continued application
of regulatory accounting for our utility activities, and that all of our regulatory assets and liabilities at
December 31, 2011 and 2010 are recoverable or refundable through future customer rates. The net
balance in regulatory asset and liability accounts as of December 31, 2011 and 2010 was $156.6
million and $125.8 million, of assets, respectively. See “Industry Regulation” in Note 2.

Revenue Recognition

Utility and non-utility revenues, which are derived primarily from the sale, transportation and

storage of natural gas, are recognized upon the delivery of gas commodity or services rendered to
customers. Revenues are accrued for gas delivered and services rendered to customers, but not yet
billed, based on estimates from the last meter reading date to month end (accrued unbilled
revenues). Accrued unbilled revenues are primarily based on a percentage estimate of amounts
unbilled each month, which is dependent upon a number of factors, some of which require
management’s judgment. These factors include total gas receipts and deliveries, customer meter
reading dates, customer usage patterns and weather. Accrued unbilled revenue estimates are reversed
the following month when actual billings occur. Estimated unbilled revenues at December 31, 2011
and 2010 were $61.9 million and $64.8 million, respectively. The decrease in accrued unbilled
revenues at year-end 2011 was primarily due to lower volumes in December 2011, reflecting warmer
weather late in the month, and lower customer billing rates. If the estimated percentage of unbilled

48

volume at December 31, 2011 was adjusted up or down by 1 percent, then unbilled revenues, net
operating revenues and net income would have increased or decreased by an estimated $1.9 million,
$0.5 million and $0.6 million, respectively.

From 2007 through 2010, utility revenues included the recognition of a regulatory adjustment

for income taxes paid (commonly referred to as SB 408). Under SB 408, we were required to
automatically implement a rate refund, or a rate surcharge, to utility customers on an annual basis. The
refund or surcharge amount was based on estimated differences between income taxes paid and income
taxes collected in customer rates. We recorded the refund, or surcharge, each quarter based on the
annual amount to be recognized. On May 24, 2011 the Oregon Governor signed Senate Bill 967 (SB
967), which repealed SB 408. The new law required utilities in Oregon to reverse amounts accrued for
the 2010 and 2011 tax years, which resulted in us recording a one-time pre-tax charge to earnings in
the second quarter of 2011 in the amount of $7.4 million ($4.4 million after-tax or 17 cents per share).
For further discussion, see “Results of Operations—Business Segments—Utility Operations—
Regulatory Adjustment for Income Taxes Paid,” below.

Non-utility revenues, derived primarily from our gas storage business segment, are recognized
upon delivery of service to customers. Revenues from our asset management partner are recognized as
earned based on multiple revenue elements, which is generally over the period of each asset
management deal, except for contracts with a guaranteed amount which are amortized pro-rata over the
life of the contract.

Accounting for Derivative Instruments and Hedging Activities

Our gas acquisition and hedging policies set forth guidelines for using financial derivative

instruments to support prudent risk management strategies. These policies specifically prohibit the use
of derivatives for trading or speculative purposes. The accounting rules for determining whether a
contract meets the definition of a derivative instrument or qualifies for hedge accounting treatment are
complex. The contracts that meet the definition of a derivative instrument are recorded on our balance
sheet at fair value. If certain regulatory conditions are met, then the derivative instrument fair value is
recorded together with an offsetting entry to a regulatory asset or liability account pursuant to
regulatory accounting (see Note 2, “Industry Regulation”), and no unrealized gain or loss is recognized
in current income. The gain or loss from the fair value of a derivative instrument subject to regulatory
deferral is included in the recovery from, or refund to, utility customers in future periods (see
“Regulatory Accounting,” above). If a derivative contract is not subject to regulatory deferral, then the
accounting treatment for unrealized gains and losses is recorded in accordance with accounting
standards for derivatives and hedging (see Note 2, “Derivatives” and “Industry Regulation”) which is
either in current income or in accumulated other comprehensive income under common stock equity on
the balance sheet. Our derivative contracts outstanding at December 31, 2011 were measured at fair
value using models or other market accepted valuation methodologies derived from observable market
data. Our estimate of fair value may change significantly from period-to-period depending on market
conditions and prices. These changes may have an impact on our results of operations, but the impact
would largely be mitigated due to the majority of our derivatives activities being subject to regulatory
deferral treatment. For estimated fair value of unrealized gains and losses at December 31, 2011 and
2010, see Note 13.

Commodity-based derivative contracts entered into by the utility after our annual PGA filing
for the current gas contract period are subject to a regulatory incentive sharing mechanism in Oregon
(see “Results of Operations—Regulatory Matters—Rate Mechanisms—Purchased Gas Adjustment,”

49

below). The portion not deferred to a regulatory account pursuant to that sharing agreement is
recognized either in current income for contracts not qualifying for hedge accounting or in
accumulated other comprehensive income for contracts qualifying for hedge accounting.

Derivative contracts not qualifying for regulatory deferral are subject to a hedge effectiveness

test to determine the financial statement treatment of each specific derivative. As of December 31,
2011, all of our derivatives were effective economic hedges and either qualified or were expected to
qualify for regulatory deferral or hedge accounting treatment. We use the hypothetical derivative
method under accounting standards for derivatives and hedging to determine the hedge effectiveness
for our interest rate swaps and the dollar offset method for other derivative contracts under accounting
standards for derivatives and hedging. The effectiveness test applied to financial derivatives is
dependent on the type of derivative and its use.

The following table summarizes the amount of gains and losses realized from commodity price,

interest rate and currency hedge transactions for the last three years:

Thousands

Net gain (loss) on commodity-price swaps—utility
Net gain (loss) on commodity-price options—utility
Net gain (loss) on interest rate swap—utility

2011

2010

2009

$(53,834) $(60,362) $(172,089)
(5,809)
(10,096)

(2,695)
-

(610)
-

Subtotal—utility

Net gain (loss) on foreign currency forward purchases—utility

Total net gain (loss) realized

(56,529)
(52)

(60,972)
72

(187,994)
88

$(56,581) $(60,900) $(187,906)

Realized gains (losses) from commodity hedges and foreign currency forward purchase
contracts are recorded as reductions (increases) to the cost of gas and are included in the calculation of
annual PGA rate changes. Realized gains (losses) from interest rate hedges are recorded as reductions
(increases) to interest charges over the term of the underlying debt issuances. Unrealized gains and
losses from commodity hedges, foreign currency hedges and interest rate hedges, which reflect
quarterly mark-to-market valuations, are generally not recognized in current income or accumulated
other comprehensive income, but are recorded as regulatory liabilities or regulatory assets, and are
offset by a corresponding balance in derivative instruments (see Note 13).

Accounting for Pensions and Postretirement Benefits

We maintain two qualified non-contributory defined benefit pension plans covering a majority

of our regular employees with more than one year of service, several non-qualified supplemental
pension plans for eligible executive officers and certain key employees, and other postretirement
employee benefit plans. We also have a qualified defined contribution plan (Retirement K Savings
Plan) for all eligible employees. Only the two qualified defined benefit pension plans and Retirement K
Savings Plan have plan assets, which are held in qualified trusts to fund the respective retirement
benefits. Effective January 1, 2007 and 2010, the qualified defined benefit retirement plans for
non-union employees and for union employees, respectively, were closed to new participants. These
plans were not available to employees at any of our subsidiary companies. Non-union and union
employees hired or re-hired after December 31, 2006 and 2009, respectively, and our subsidiary
employees, are provided an enhanced Retirement K Savings Plan benefit. Also, effective January 1,
2007 the postretirement Welfare Benefit Plan for Non-Bargaining Unit Employees was closed to new
participants after December 31, 2006.

50

Net periodic pension and postretirement benefit costs (retirement benefit costs) and projected
benefit obligations (benefit obligations) are determined in accordance with accounting standards for
compensation and retirement benefits using a number of key assumptions including discount rates, rate
of compensation increases, retirement ages, mortality rates and an expected long-term return on plan
assets (see Note 9). These key assumptions have a significant impact on the pension amounts recorded
and disclosed. Retirement benefit costs consist of service costs, interest costs, the amortization of
actuarial gains, losses and prior service costs, the expected returns on plan assets and, in part, on a
market-related valuation of assets, if applicable. The market-related asset valuation reflects differences
between expected returns and actual investment returns, which we recognize over a three-year period
or less from the year in which they occur, thereby reducing year-to-year volatility in retirement benefit
costs.

Accounting standards also require balance sheet recognition of the overfunded or underfunded

status of pension and postretirement benefit plans in accumulated other comprehensive income
(AOCI), net of tax, based on the fair value of plan assets compared to the actuarial value of future
benefit obligations. However, the retirement benefit costs relating to our qualified defined benefit
pension and postretirement benefit plans are generally recovered in utility rates which are set based on
accounting standards for pensions and postretirement benefits, and as such we received approval from
the OPUC pursuant to regulatory accounting to recognize the overfunded or underfunded status as a
regulatory asset or regulatory liability based on expected rate recovery, rather than including it as
AOCI under common equity (see “Regulatory Accounting”, above, and Note 2, “Industry
Regulation”).

The retirement benefit cost for pensions consists of service costs, interest costs, the expected

returns on plan assets, and the amortization of actuarial gains and losses. Effective January 1, 2011, we
began deferring a portion of our pension expense to a regulatory account on the balance sheet pursuant
to OPUC approval of pension expenses above or below the amount set in rates. In 2011, the cumulative
amount deferred for future pension cost recovery was $6.0 million. The regulatory asset account earns
a carrying cost at the authorized cost of capital rate set by the OPUC.

A number of factors are considered in developing pension and postretirement assumptions,

including evaluations of relevant discount rates, an evaluation of expected long-term investment
returns based on asset classes and target asset allocations, expected changes in salaries and wages,
analyses of past retirement plan experience and current market conditions and input from actuaries and
other consultants. For the December 31, 2011 measurement date, we reviewed and updated:

•

•

•

•

our weighted-average discount rate assumptions for pensions and other postretirement
benefits, which went from 5.49 percent to 4.51 percent and from 5.16 percent to 4.33
percent, respectively. The new rate assumptions were determined for each plan based on a
matching of benchmark interest rates to the estimated cash flows, which reflects the timing
and amount of future benefit payments. Benchmark interest rates are drawn from the
Citigroup Above Median Curve, which consists of high quality bonds rated AA- or higher
by Standard & Poor’s (S&P) or Aa3 or higher by Moody’s Investors Service (Moody’s);
our expected annual rate of future compensation increases, which remained unchanged at a
range of 3.25 to 5.0 percent;
our expected long-term return on qualified defined benefit plan assets, which was reduced
to 8.00 percent from 8.25 percent; and
other key assumptions, which were based on actual experience and actuarial
recommendations.

51

At December 31, 2011, our net pension liability (benefit obligations less market value of plan

assets) for the two qualified defined benefit plans increased $51.5 million compared to 2010. The
increase in our net pension liability is primarily due to the $48.4 million increase in our pension
obligation. The liability for non-qualified plans increased $3.3 million and the liability for other
postretirement benefits increased $2.4 million in 2011.

We determine the expected long-term rate of return on plan assets by averaging the expected
earnings for the target asset portfolio. In developing our expected return, we evaluate an analysis of
historical actual performance and long-term return projections, which gives consideration to the current
asset mix and our target asset allocation. As of December 31, 2011, the actual annualized returns on
plan assets, net of management fees, for the past one-year, five-years, 10-years and since inception
were 2.4 percent, 0.2 percent, 4.8 percent and 9.9 percent, respectively.

We believe our pension assumptions to be appropriate based on plan design and an assessment
of market conditions. However, the following shows the sensitivity of our retirement benefit costs and
benefit obligations to future changes in certain actuarial assumptions:

Thousands, except percent

Discount rate:

Qualified defined benefit plans
Non-qualified plans
Other postretirement benefits

Expected long-term return on plan assets:

Qualified defined benefit plans

Accounting for Income Taxes

Change in
Assumption

(0.25%)

(0.25%)

Impact on 2011
Retirement
Benefit Costs

Impact on Retirement
Benefit Obligations
at Dec. 31, 2011

$1,162
8
54

580

$11,796
53
754

N/A

We account for income taxes in accordance with accounting standards that require the
recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary
differences between financial statement carrying amount and tax basis of assets and
liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to
taxable income in the years in which those temporary differences are expected to be recovered or
settled. At December 31, 2011 and 2010, our net long-term deferred tax liability totaled $413.2 million
and $373.4 million, respectively. After application of the federal statutory tax rate to book income,
judgment is required with respect to the timing and deductibility of expense in our tax returns. For state
income tax and local income taxes, judgment is also required with respect to the apportionment among
the various jurisdictions. A valuation allowance is recorded if we expect that it is “more likely than
not” that our deferred tax assets will not be realized. At December 31, 2011, we did not have a
valuation allowance due to our expectation that all of these assets and liabilities will be realized.

These accounting standards also require the recognition of deferred income tax assets and

liabilities for temporary differences where regulators require us to flow through deferred income tax
benefits or expenses in the ratemaking process of the regulated utility (regulatory tax assets and
liabilities). This is consistent with the ratemaking policies of the OPUC and WUTC. Regulatory tax
assets and liabilities are recorded to the extent we believe they will be recoverable from, or refunded to,
customers in future rates. At December 31, 2011 and 2010, we had regulatory assets representing
differences between book and tax basis related to pre-1981 property of $68.5 million and $72.3 million,

52

respectively, and recorded an offsetting deferred tax liability. We received authorization from the OPUC
and WUTC in 2009 to accelerate the recovery of these pre-1981 regulatory assets through future utility
rates. See Notes 2 and 10.

Uncertain tax positions are accounted for in accordance with accounting standards that require

management’s assessment of the expected treatment of a tax position taken in a filed tax return, or
planned to be taken in a future tax return, that has not been reflected in measuring income tax expense
for financial reporting purposes. Until such positions are sustained by the taxing authorities, we would
not recognize the tax benefits resulting from such positions and would report the tax effect as a liability
in the Company’s consolidated balance sheet. As of December 31, 2011, we had no uncertain tax
positions.

The IRS completed its examination of the 2006 through 2008 tax years in 2011. The

examination resulted in payments of $1.5 million of tax and $0.2 million of interest. The Oregon
Department of Revenue (ODOR) completed its field examination of our 2006 through 2009
consolidated Oregon income tax returns and issued preliminary assessments. If sustained by the
ODOR, these assessments would result in an additional state tax liability of approximately $0.8
million, including interest and penalties. The Company is engaged in discussions with ODOR to
resolve these issues; however, uncertainty exists with respect to the outcome of the audit as a result of
information not yet fully considered by the ODOR. Resolution is expected to be reached within the
next 12 months, and we have determined that it is more-likely-than-not that we will prevail on these
issues. As such, no amounts have been recorded in our financial statements as of December 31, 2011
related to this matter.

Interest and penalties related to any future income tax deficiencies are recorded in income tax

expense in our consolidated statements of income.

Accounting for Contingencies

Loss contingencies are recorded as liabilities when it is probable that a liability has been

incurred and the amount of the loss is reasonably estimable in accordance with accounting standards
for contingencies. Estimates of loss contingencies, including estimates of legal costs when such costs
are probable of being incurred and are reasonably estimable and related disclosures are updated when
new information becomes available. Estimating probable losses requires an analysis of uncertainties
that often depend upon judgments about potential actions by third parties. Accruals for loss
contingencies are recorded based on an analysis of potential results. When information is sufficient to
estimate only a range of potential liabilities, and no point within the range is more likely than any
other, we recognize an accrued liability at the low end of the range and disclose the range (see
“Contingent Liabilities,” below). It is possible, however, that the range of potential liabilities could be
significantly different than amounts currently accrued and disclosed, with the result that our financial
condition and results of operations could be materially affected by changes in the assumptions or
estimates related to these contingencies.

With respect to environmental liabilities and related costs, we develop estimates based on a

review of information available from numerous sources, including completed studies and site specific
negotiations. Using sampling data, feasibility studies, existing technology and enacted laws and
regulations, we estimate that the total future expenditures for environmental investigation, monitoring
and remediation are $72.7 million as of December 31, 2011. It is our policy to accrue the full amount
of such liability when information is sufficient to reasonably estimate the amount of probable liability.

53

When information is not available to reasonably estimate the probable liability, or when only the range
of probable liabilities can be estimated and no amount within the range is more likely than another,
then it is our policy to accrue at the lower end of the range. Accordingly, due to numerous uncertainties
surrounding the course of environmental remediation and the preliminary nature of several site
investigations, in some cases, we may not be able to reasonably estimate the high end of the range of
possible loss. In those cases we have disclosed the nature of the potential loss and the fact that the high
end of the range cannot be reasonably estimated.

We will continue to seek recovery of such costs through insurance and through customer rates,
and we believe recovery of these costs is probable. If it is determined that both the insurance recovery
and future rate recovery of such costs are not probable, the costs will be charged to expense in the
period such determination is made. See Note 15.

Results of Operations

Regulatory Matters

Regulation and Rates

Utility. We are subject to regulation with respect to, among other matters, rates and systems of

accounts set by the OPUC, WUTC, and FERC. The OPUC and WUTC also regulate our issuance of
securities by the utility. In 2011, approximately 90 percent of our utility gas volumes and revenues
were derived from Oregon customers and approximately 10 percent from Washington customers.
Future earnings and cash flows from utility operations will be determined by the Oregon and
Washington economies in general, by the pace of growth in the residential and commercial markets in
particular, and by our ability to remain price competitive, control expenses, and obtain reasonable and
timely regulatory recovery for our utility gas costs, including operating and maintenance expenses and
investment costs made in utility plant and other regulatory assets.

Gas Storage. Our gas storage business is subject to regulation with respect to, among other

matters, issuance of securities and systems of accounts set by the OPUC, FERC, and the CPUC. The
CPUC regulates Gill Ranch under a market based rates model which allows for the price for storage
services to be set by market conditions. The OPUC and FERC regulate intrastate and interstate storage
services, respectively, under a maximum cost of service model which allows for storage prices to be
set at or below the cost of service as set in the last approved regulatory filing for each agency. In 2011,
approximately 65 percent of our storage revenues were derived from FERC and Oregon approved rates
to customers and approximately 35 percent from California approved rates to customers.

General Rate Cases

Oregon. On December 30, 2011, we filed an application for a general rate increase at the

OPUC. In the filing, we have requested an increase in authorized annual Oregon jurisdictional
revenues of $43.7 million, equivalent to a rate increase of 6.2 percent. The amount and percent of this
rate increase includes an estimated $15.1 million that represents the cumulative effect of declining use
per customer. This cost is already included in customers’ current rates through the operation of the
Company’s conservation tariff, which has been in place since 2003. The increase also includes costs
related to pension contributions and additional utility services. The filing also requests an authorized
overall rate of return on capital of 8.28 percent, with a return on common stock equity (ROE) of 10.3
percent and a capital structure of 50 percent common equity. In addition, we have requested the
establishment of rate recovery mechanisms for deferred costs related to our environmental

54

liabilities. The filing also requests rate redesign for residential customers with a higher fixed fee, which
would effectively combine and incorporate the effects of the weather normalization and decoupling
tariffs in the new fixed fee amount. The new rates are requested to be effective by November 1,
2012. We are unable to predict the outcome of this rate proceeding.

Our most recent general rate case in Oregon was effective September 2003. The OPUC
authorized rates to customers based on an ROE of 10.2 percent. In 2007, in connection with the
renewal of our conservation tariff and weather normalization rate mechanism, the OPUC approved a
stipulation that restricted us from filing a general rate case in Oregon prior to September 2011.
However, in 2011 the OPUC approved our gas reserve acquisition (see “Rate Mechanisms—Gas
Reserves” below) with a condition that we file a general rate case by the end of 2011. These
agreements did not impact our requirement to file annual rate adjustments to reflect changes in gas
purchase costs under the PGA mechanism or our ability to collect or refund prior year’s gas cost
deferrals. See “Rate Mechanisms—Purchased Gas Adjustment,” below.

Washington. Our most recent general rate case in Washington was in 2008, and in it the
WUTC authorized rates to customers based on an ROE of 10.1 percent and an overall rate of return of
8.4 percent. These customer rates went into effect on January 1, 2009, with annual revenue
requirements increased by $2.7 million or 3 percent.

FERC Jurisdiction. We are required under our Mist interstate storage certificate authority and

rate approval orders to file every five years either a petition for rate approval or a cost and revenue
study to change or justify maintaining the existing rates for our interstate storage services. Our most
recent filing of a cost and revenue study was in April 2008. As a result of that proceeding, the current
maximum cost-based rates for our interstate gas storage services were approved by FERC, with
maximum rates unchanged from prior levels approved by FERC in 2005. In addition, we made a filing
in December 2008 to obtain FERC approval to revise the depreciation rates associated with Mist assets
used to derive the cost-based interstate storage rates. These new depreciation rates were designed to
match the depreciation rates for the same type of assets approved under state regulation. We did not
make any changes to the previously approved maximum rates, and FERC approved the depreciation
rate filing in May 2009. We are required to make our next cost and revenue study filing at FERC on or
before December 11, 2013.

California. Gill Ranch is authorized by the CPUC to charge market-based rates for the

intrastate storage services offered to customers in California.

Rate Mechanisms

Purchased Gas Adjustment. Rate changes are established for the utility each year under PGA

mechanisms in Oregon and Washington to reflect changes in the expected cost of natural gas
commodity purchases, including contract gas purchase prices, gas prices hedged with financial
derivatives or physical gas reserves, gas inventory prices, interstate pipeline demand costs, the
application of temporary rate adjustments to amortize balances in deferred regulatory accounts and the
removal of temporary rate adjustments effective for the previous year.

In October 2011, the OPUC and WUTC approved PGA rate changes effective November 1,

2011. The effect of these rate changes was to decrease the average monthly bills of Oregon and
Washington residential customers by about 2 percent. This was our third consecutive year of PGA rate
decreases, and cumulatively our average utility residential customer bills declined 20 percent in
Oregon and 26 percent in Washington since 2008.

55

Under the current PGA mechanism in Oregon, there is an incentive sharing provision whereby
we are required to select each year either an 80 percent or 90 percent deferral of higher or lower actual
gas costs compared to estimated PGA prices, such that the impact on current earnings from the
incentive sharing is either 20 percent or 10 percent of the difference between actual and estimated gas
costs, respectively. In addition to the gas cost incentive sharing mechanism, we are subject to an annual
earnings test to determine if the utility is earning above its authorized ROE threshold. If utility earnings
exceed a specific ROE level, then 33 percent of the amount above that level is required to be deferred
for refund to customers. Under this provision, if we select the 80 percent deferral option, then we retain
all of our earnings up to 150 basis points above the currently authorized ROE. If we select the 90
percent deferral option, then we retain all of our earnings up to 100 basis points above the currently
authorized ROE. We selected the 90 percent deferral option for the 2009-10, the 2010-2011 and the
2011-2012 PGA years. The ROE threshold is subject to adjustment annually based on movements in
long-term interest rates. For calendar years 2009 and 2010, the ROE threshold after adjustment for
long-term interest rates was 11.5 percent and 11.02 percent, respectively. No amounts were required to
be refunded to customers as a result of the 2009 utility earnings test, while we are refunding $0.2
million to customers in the current PGA for the 2010 utility earnings test. For 2011, we accrued an
estimated $1.5 million for potential refund to customers in the next PGA.

There has been no change to the Washington PGA mechanism under which we defer 100
percent of the higher or lower actual gas costs, with those cost differences passed on to customers
through an adjustment to future rates.

Gas Reserves. In April, 2011 the OPUC approved the Encana gas reserve transaction for utility
customers and determined that the Company’s costs under the agreement will be recovered, plus a rate
base return on our investment, on an ongoing basis through our annual PGA mechanism, including the
regulatory deferral and incentive sharing process for the commodity cost of gas. Annually, a forecast
will be established for the amounts related to costs and volumes expected, and any variances between
forecasted and actual results will be subject to our PGA incentive sharing in Oregon, up to a maximum
variance of $10 million of which 10 percent (or $1 million maximum) would be recognized in current
income. Variances in excess of $10 million, both negative and positive, will be deferred and passed
through to customers in future rates at 100 percent.

Conservation Tariff. In October 2002, the OPUC authorized the implementation of a
“conservation tariff” to adjust utility margin for changes in consumption patterns due to residential and
commercial customers’ conservation efforts. The conservation tariff is a decoupling mechanism that is
intended to break the link between utility earnings and the quantity of gas consumed by customers,
removing any financial incentive by the utility to discourage customers’ efforts to conserve energy. In
Washington, customer use is not covered by a conservation or decoupling tariff, and as such our utility
earnings are affected by increases and decreases in usage based on customers’ conservation
efforts. Washington customers account for about 10 percent of our utility volumes and revenues.

The Oregon conservation tariff includes two components: (1) an annual price elasticity

adjustment, which adjusts rates for increases or decreases from expected customer volumes due to
changes in commodity costs or changes in our general rates; and (2) a monthly conservation
adjustment, which adjusts margin revenues to account for the difference between actual and expected
customer volumes (also referred to as the decoupling adjustment). The margin adjustment resulting
from differences between actual and expected volumes under the decoupling component is recorded to
a deferral account, which is included in the next annual PGA filing. Baseline consumption was
determined by customer consumption data used in the 2003 Oregon general rate case and is adjusted

56

annually for customer growth and the effect of the price elasticity adjustment discussed above. From
2003 to 2011, we have experienced approximately 14 percent decline in average use per residential
customer and approximately 8 percent decline in average use per commercial customer. As a result of
these declines, customers have paid surcharges related to a decoupling adjustment in seven of the past
nine heating seasons. See “Business Segments—Utility Operations,” below.

In 2005, an independent study was commissioned to measure the effectiveness of Oregon’s

conservation tariff mechanism. The results of this study recommended continuation of the tariff with
minor modifications. The tariff modifications were approved by the OPUC, and the mechanism was
extended through October 2012.

Weather Normalization Tariff. In Oregon, we have an approved weather normalization

mechanism applied to residential and commercial customer bills. This mechanism is designed to help
stabilize the collection of fixed costs by adjusting residential and commercial customer billings based
on temperature variances from average weather, with rate decreases when the weather is colder than
average and rate increases when the weather is warmer than average. The mechanism is applied to bills
between December 1 and May 15 of each heating season. The mechanism adjusts the margin
component of customers’ rates to reflect average weather, which uses the 25-year average temperature
for each day of the billing period. Daily average temperatures and 25-year average temperatures are
based on a set point temperature of 59 degrees Fahrenheit for residential customers and 58 degrees
Fahrenheit for commercial customers (see “Business Segments—Utility Operations,” below). The
weather normalization mechanism for Oregon utility operations is approved through October 2012.
Customers in Oregon are allowed to opt out of the weather normalization mechanism, and as of
December 31, 2011, 9 percent had opted out. We do not have a weather normalization mechanism
approved for Washington customers, which account for about 10 percent of our utility volumes and
revenues.

Industrial Tariffs. The OPUC and WUTC approve tariffs covering utility service to our major

industrial customers, including terms which are intended to give us certainty in the level of gas
supplies we need to acquire to serve this customer group. The terms include, among other things, an
annual election period, special pricing provisions for out-of-cycle changes, and a requirement that
industrial customers under our annual PGA tariff complete the term of their service election.

System Integrity Program. Since 2002, various laws requiring minimum standards for
integrity management programs and system integrity programs (SIP) for natural gas distribution
pipelines have been enacted. Most recently, in January 2012 the “Pipeline Safety, Regulatory
Certainty, and Job Creation Act of 2011” was signed into law and requires increased civil penalties for
pipeline safety violations, improvements in prevention programs for pipelines, and additional review
and analysis of various aspects of gas transmission lines. We are working diligently with industry
associations and federal and state regulators to ensure NW Natural’s compliance with the provisions of
this new law.

The OPUC has approved specific accounting treatment and cost recovery for our transmission
pipeline integrity management program, SIP, and the related rules adopted by the U.S. Department of
Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA). We record the
costs related to the integrity management program as either capital expenditures or regulatory assets,
accumulate the costs over each 12-month period, and recover the revenue requirement associated with
the costs, subject to audit, through rate changes effective with the annual PGA in Oregon. Our SIP
costs are tracked into rates annually, with rate recovery after the first $3.3 million of capital costs. An

57

annual cap for expenditures has been set at $12 million, but extraordinary costs above the cap may be
approved with written consent of the OPUC staff and other interested parties and approval of the
OPUC. The SIP allows recovery of costs incurred in Oregon during the period from October 2008
through the effective date of our next general rate case. We do not have any special accounting or rate
treatment for our SIP costs incurred in the state of Washington.

Environmental Costs. The OPUC has authorized us to defer environmental costs associated

with certain named sites and to accrue a carrying cost on environmental costs paid, subject to an annual
demonstration that we have maximized our insurance recovery or made substantial progress in
securing insurance recovery for unrecovered environmental expenses. Through a series of extensions,
the authorized cost deferral and accrual of carrying costs was extended through January 2012. In
January 2012, we filed a request with the OPUC to continue our deferral of these environmental costs.
See Note 15 for further discussion of our regulatory and insurance recovery of environmental costs.

The WUTC has also authorized the deferral of environmental costs, if any, that are incurred in

connection with services provided to Washington customers. The order granting approval of that
request was effective January 26, 2011.

Pension Deferral. Effective January 1, 2011, the OPUC approved our request to defer annual

pension expenses above the amount set in rates in our last general rate case, with recovery of these
deferred amounts through the implementation of a balancing account, which includes the expectation
of higher and lower pension expenses in future years. Our recovery of these deferred balances includes
accrued interest on the account balance at the utility’s authorized rate of return, which is currently 8.62
percent. The reduction to operations and maintenance expense for 2011 was $6.0 million. Future years’
deferrals will depend on changes in plan assets and projected benefit liabilities using a number of key
assumptions, as well as our pension contributions. We estimate deferrals totaling $8 million to $9
million in 2012. See “Application of Critical Accounting Policies and Estimates,” above.

Customer Credits for Gas Storage Sharing. In June 2011, $12.5 million was credited to

Oregon utility customers from our regulatory incentive sharing mechanism related to gas storage and
asset management services of pipeline capacity and gas storage at Mist (see “Gas Storage,” below). In
June 2010, we credited $11.0 million to customers under the same regulatory sharing mechanism. Our
Washington utility customers receive their respective share of this credit as part of the annual PGA
filing. In November 2011, a $0.9 million credit was placed in Washington utility customer rates for
these activities, compared to a $1.2 million credit to Washington customers in November 2010.

Business Segments—Utility Operations

Utility net operating revenues (margins) are affected by customer growth, and to a certain

extent, by changes in volume due to weather and customer consumption patterns because a significant
portion of our revenues are derived from natural gas sales to residential and commercial customers. In
Oregon, we have a conservation tariff, which adjusts revenues to offset changes in margin resulting
from increases or decreases in average use by residential and commercial customers, and a weather
normalization tariff, which adjusts to offset changes in margin resulting from above- or below-average
temperatures during the winter heating season (see “Results of Operations—Regulatory Matters—Rate
Mechanisms,” above). Both the conservation and weather normalization mechanisms have the effect of
reducing the volatility of our utility earnings. We also have other regulatory mechanisms, which
increase or decrease utility margins to account for other costs and revenues approved by the OPUC or
WUTC. See “Results of Operations—Regulatory Matters—Rate Mechanisms,” below.

58

2011 compared to 2010:

Our utility segment in 2011 earned $60.5 million, or $2.26 per share, compared to $66.3
million, or $2.49 per share in 2010. The major factors contributing to the change was a $14.9 million
reduction in utility margins related to the repealed Oregon legislative rule on utility income taxes paid,
including of a $7.4 million write-off in 2011 plus a $7.7 million revenue accrual recognized in 2010,
and a net gain of $6.1 million recognized in 2010 related to a refund of property taxes plus accrued
interest from a favorable tax ruling. These were partially offset by increases in residential and
commercial customer margins of $11.3 million, including the effects of weather normalization and
decoupling mechanisms, a slight gain in industrial customer margins of $0.2 million, and an increase in
gas cost incentive sharing of $0.5 million. Total utility volumes sold and delivered in 2011 increased 9
percent over last year primarily due to the impact of colder weather on residential and commercial use.

Our weather normalization mechanism adjusted residential and commercial margins down by
$13.1 million for the year ended December 31, 2011 based on weather that was 9 percent colder than
average, compared to a margin increase of $14.0 million for the year ended December 31, 2010 when
weather was 2 percent warmer than average. Our decoupling mechanism adjusted residential and
commercial margins up by $19.3 million in 2011, after adjusting for expected price elasticity impacts
from lower PGA prices effective November 1, 2010, compared to margin adjustments up by $15.5
million in 2010.

2010 compared to 2009:

Our utility segment in 2010 earned $66.3 million, or $2.49 per share, compared to $66.0
million, or $2.48 per share in 2009. The major factors contributing to the change were reduced
operating expenses largely offset by lower utility margins. The lower margins consisted of a $13.5
million decrease from the prior year’s gas cost incentive sharing, partially offset by a net $5 million
increase from residential and commercial customers, including the effects of the weather normalization
and decoupling mechanisms, and a $0.7 million increase in industrial margin. Total utility volumes
sold and delivered in 2010 decreased by 6 percent over last year due to the effects of warmer weather
on residential and commercial use and the lingering effects of a weak economy on commercial and
industrial use. The regulatory adjustment for income taxes paid increased margin by $1.8 million
compared to 2009.

Our weather normalization mechanism adjusted residential and commercial margins up by

$14.0 million for the year ended December 31, 2010 based on weather that was 2 percent warmer than
average, compared to a margin reduction of $15.2 million for the year ended December 31, 2009 when
weather was 3 percent colder than average. Our decoupling mechanism adjusted residential and
commercial margins up by $15.5 million in 2010, after adjusting for expected price elasticity impacts
from lower PGA prices effective November 1, 2009, compared to margin adjustments totaling $11.6
million in 2009.

59

The following table summarizes the composition of gas utility volumes and revenues for the

years ended December 31, 2011, 2010 and 2009:

Thousands, except degree day and
customer data

Utility volumes—therms:
Residential sales
Commercial sales
Industrial—firm sales
Industrial—firm transportation
Industrial—interruptible sales
Industrial—interruptible transportation

Total utility volumes sold and delivered

Utility operating revenues—dollars:
Residential sales
Commercial sales
Industrial—firm sales
Industrial—firm transportation
Industrial—interruptible sales
Industrial—interruptible transportation
Regulatory adjustment for income taxes paid (1)
Other revenues

Total utility operating revenues

Cost of gas sold
Revenue taxes

Utility margin

Utility margin: (2)
Residential sales
Commercial sales
Industrial—sales and transportation
Miscellaneous revenues
Gain (loss) from gas cost incentive sharing
Other margin adjustments

Margin before regulatory adjustments

Weather normalization adjustment
Decoupling adjustment
Regulatory adjustment for income taxes paid (1)

Utility margin

Customers—end of period:
Residential customers
Commercial customers
Industrial customers

Total number of customers—end of period

Actual degree days

2011

2010

2009

425,139
259,675
37,344
129,898
59,308
240,990
1,152,354

368,682
230,196
37,085
127,796
58,387
239,823
1,061,969

412,867
255,593
39,447
124,218
72,525
226,715
1,131,365

$ 492,490 $ 456,174 $ 555,844
292,697
41,407
5,671
62,116
7,964
5,884
21,166
992,749
611,088
24,656
$ 342,970 $ 346,148 $ 357,005

244,922
30,455
6,250
34,961
9,169
(7,162)
11,134
822,219
458,508
20,741

227,994
30,830
5,702
36,164
8,131
7,721
17,917
790,633
424,494
19,991

$ 222,526 $ 197,045 $ 217,124
85,850
27,713
6,670
15,064
2,308
354,729
(15,236)
11,628
5,884
$ 342,970 $ 346,148 $ 357,005

86,971
28,635
4,875
2,107
(1,173)
343,941
(13,106)
19,297
(7,162)

77,831
28,451
4,658
1,594
(647)
308,932
13,996
15,499
7,721

615,670
62,948
925
679,543

610,598
62,489
910
673,997

604,692
62,169
933
667,794

4,652

4,171

4,383

Favorable/(Unfavorable)

2011
vs. 2010

2010
vs. 2009

56,457
29,479
259
2,102
921
1,167
90,385

$ 36,316
16,928
(375)
548
(1,203)
1,038
(14,883)
(6,783)
31,586
(34,014)
(750)
$ (3,178)

$ 25,481
9,140
184
217
513
(526)
35,009
(27,102)
3,798
(14,883)
$ (3,178)

5,072
459
15
5,546

(44,185)
(25,397)
(2,362)
3,578
(14,138)
13,108
(69,396)

$ (99,670)
(64,703)
(10,577)
31
(25,952)
167
1,837
(3,249)
(202,116)
186,594
4,665
$ (10,857)

$ (20,079)
(8,019)
738
(2,012)
(13,470)
(2,955)
(45,797)
29,232
3,871
1,837
$ (10,857)

5,906
320
(23)
6,203

Percent colder (warmer) than average weather (3)

9%

(2)%

3%

(1) Regulatory adjustment for income taxes paid is described below.
(2) Amounts reported as margin for each category of customers are net of cost of gas sold and revenue taxes.
(3) Average weather represents the 25-year average degree days, as determined in our last Oregon general rate

case.

60

Residential and Commercial Sales

The primary factors that impact results of operations in the residential and commercial markets
are customer growth, seasonal weather patterns, energy prices, competition from other energy sources
and economic conditions in our service areas. Typically, 80 percent or more of our annual utility
operating revenues are derived from gas sales to weather-sensitive residential and commercial
customers. Although variations in temperatures between periods will affect volumes of gas sold to
these customers, the effect on margin and net income is significantly reduced due to our weather
normalization mechanism in Oregon where about 90 percent of our customers are served. For more
information on our weather mechanism, see “Regulatory Matters—Rate Mechanisms—Weather
Normalization,” above.

The primary changes that impacted margin from residential and commercial sales were as

follows:

2011 compared to 2010:

•

•

•

utility volumes were 14 percent higher, primarily reflecting 12 percent colder weather; sales
volumes to core utility customers are sensitive to weather variations especially in the
winter-heating season;
utility operating revenues increased $53.2 million or 8 percent primarily due to the 14
percent volume increase;
utility margin increased $11.3 million or 4 percent primarily due to customer growth of 0.8
percent and colder weather, with colder weather benefits partially offset by weather
normalization adjustments that reduce customer bills and Company margins when weather
is colder than average.

2010 compared to 2009:

•

•

•

utility volumes were 10 percent lower, primarily reflecting 5 percent warmer weather,
conservation efforts and weak economic conditions;
utility operating revenues decreased $164.4 million or 19 percent primarily due to the 10
percent volume decline and customer rate decreases of 16 and 22 percent in Oregon and
Washington, respectively, effective November 1, 2009; and
utility margin increased $5 million or 2 percent primarily due to customer growth of 0.9
percent and the colder weather in the spring of 2010 that was not entirely offset by
Oregon’s weather normalization mechanism.

61

Industrial Sales and Transportation

Operating revenues from industrial customers include the commodity cost component of gas

sold under sales service but not under transportation service. Therefore, operating revenues from
industrial customers can increase or decrease when customers switch between sales service and
transportation service, but generally our margins from these customers are unaffected by these changes
because we do not generally include a profit mark-up for the cost of gas. As such, we believe volumes
delivered and margins are better measures of performance for the industrial sector. The primary
changes that impacted margin from industrial sales and transportation were as follows:

2011 compared to 2010:

•

volumes delivered to industrial customers increased 4.4 million therms, or 1 percent,
reflecting increased energy demand, with the majority of the increased volume attributable
to the manufacturing sector; and

• margins increased $0.2 million, or 1 percent.

2010 compared to 2009:

volumes delivered to industrial customers increased 0.2 million therms; and

•
• margin increased $0.7 million, or 3 percent.

The slight margin increases in 2011 and 2010 were primarily due to an increase in industrial

use of natural gas as a result of higher costs for oil and propane fuels, which caused some customers to
switch to natural gas. Partially offsetting this trend was the loss of a few large industrial customers due
to the economy.

Regulatory Adjustment for Income Taxes Paid

From 2007 through 2010, Oregon law required the Company and certain regulated natural gas

and electric utilities to annually review the amount of income taxes collected in rates from utility
operations and compare it to the amount the utility actually pays to taxing authorities. Under this law,
if the amount paid for income taxes related to utility operations is less than the amount collected from
Oregon utility customers, then we were required to refund the excess to Oregon utility customers.
Conversely, if the amount paid in income taxes was more than the amount collected from Oregon
utility customers, then we were required to collect a surcharge from Oregon utility customers.

The Company’s income tax review resulted in a surcharge to customers each year SB 408 was

in effect. For 2009, the OPUC approved the Company’s recovery of $5.1 million plus interest from
customers. For the 2010 tax year, we originally estimated and accrued $7.1 million. However, when
SB 967 was signed into law in May of 2011, it effectively repealed the regulatory adjustment for
income taxes paid for the 2010 tax year and all years thereafter, thus resulting in the Company
recording a $7.4 million write-off in the second quarter of 2011 to write-off the amount from SB 408,
plus interest, related to 2010 tax year. Results related to SB 408 for 2011 were a pre-tax loss of $7.4
million, compared to pre-tax gains of $7.7 million in 2010 and $5.9 million in 2009.

SB 967 requires the OPUC to make decisions in future ratemaking proceedings on the amounts

of income taxes to be recovered in customer rates. For additional information, see “Revenue
Recognition” above under Application of Critical Accounting Policies and Estimates.

62

Other Revenues

Other revenues include miscellaneous fee income as well as regulatory revenue adjustments,

which reflect current period deferrals to and prior year amortizations from, regulatory asset and
liability accounts, except for gas cost deferrals which flow through cost of gas sold. Other revenues
increased utility margins by $11.1 million in 2011, compared to $17.9 million in 2010 and $21.2
million in 2009.

2011 compared to 2010:

Other revenues decreased $6.8 to $11.1 million in 2011 primarily reflecting a decrease in the

amortization of decoupling adjustments totaling $5.9 million and a decrease in other regulatory
amortizations of $4.6 million, partially offset by a $1.0 million increase in the refund to utility
customers related to gas storage incentive sharing mechanism and an increase in the current decoupling
deferral of $3.8 million.

Decoupling amortizations and other regulatory amortizations from prior year deferrals are
included in current or future revenues from residential, commercial and industrial firm customers.

2010 compared to 2009:

Other revenues decreased $3.2 to $17.9 in 2010 primarily reflecting an increase in the
amortization of decoupling adjustments totaling $7.9 million, partially offset by a $4.0 million increase
in the refund to utility customers related to gas storage incentive sharing mechanism.

Cost of Gas Sold

The cost of gas sold includes gas purchases, gas drawn from storage inventory, gains and losses

from commodity hedges, pipeline demand costs, seasonal demand cost balancing adjustments,
regulatory gas cost deferrals, production from gas reserves, and company gas use. The OPUC and the
WUTC generally require the natural gas commodity costs to be billed to customers at the same cost
incurred or expected to be incurred by the utility. We have not historically earned a profit or incurred a
loss on gas commodity purchases; however, in Oregon we have an incentive sharing provision
whereby we can either increase or decrease margin revenues from gas cost variances as compared to
gas costs embedded in the PGA. Under this provision, our net income can be affected by differences
between actual and expected purchased gas costs, which occur primarily because of market
fluctuations and volatility affecting unhedged gas purchases. In addition, we recently entered into a
regulatory agreement where we receive a rate base return on our investment in gas reserves. (see
“Regulatory Matters—Rate Mechanisms—Purchased Gas Adjustment and Regulatory Matters—Rate
Mechanisms—Gas Reserves,” above). We use natural gas commodity-based hedge contracts
(derivatives), primarily fixed-price commodity swaps, consistent with our financial derivatives policies
to help manage our exposure to rising gas prices. Gains and losses from financial hedge contracts are
generally included in our PGA prices and normally do not impact net income because the hedge prices
are usually 100 percent passed through to customers in annual rate changes, subject to a regulatory
prudency review. However, utility hedge contracts entered into after the annual PGA rates are set in
Oregon can impact net income because we would be required to share in any gains or losses compared
to the corresponding commodity prices included in rates in the PGA. In Washington, 100 percent of the
actual gas costs, including hedge gains and losses allocated to Washington gas sales, are passed

63

through in customer rates (see “Application of Critical Accounting Policies and Estimates—
Accounting for Derivative Instruments and Hedging Activities,” and “Regulatory Matters—Rate
Mechanisms—Purchased Gas Adjustment,” above, and Note 15). The following summarizes the major
factors that contributed to changes in cost of gas sold:

2011 compared to 2010:

•

•

•

total cost of gas sold increased $34 million, or 8 percent, due to an 9 percent increase in
total sales volumes partially offset by a 4 percent decrease in the average cost of gas sold
per therm;
the average gas cost collected through rates decreased from 61 cents per therm in 2010 to
59 cents per therm in 2011, primarily reflecting lower commodity prices that were passed
through to PGA rate decreases effective November 1, 2010 and 2011; and
hedge losses totaling $56.5 million were realized and included in cost of gas sold for the
year ended December 31, 2011, compared to $61.0 million of hedge losses in the same
period of 2010.

2010 compared to 2009:

•

•

•

total cost of gas sold decreased $186.6 million, or 31 percent, due to a 6 percent decrease in
total sales volumes and a 22 percent decrease in the average cost of gas sold per therm;
the average gas cost collected through rates decreased from 78 cents per therm in 2009 to
61 cents per therm in 2010, primarily reflecting lower commodity prices that were passed
through to PGA rate decreases effective November 1, 2009 and 2010; and
hedge losses totaling $61.0 million were realized and included in cost of gas sold for the
year ended December 31, 2010, compared to $187.9 million of hedge losses in the same
period of 2009.

Actual gas costs in both 2011 and 2010 were slightly below those embedded in rates, while in
2009 actual gas costs were significantly lower. The effect on shareholders from the gas cost incentive
sharing mechanism was a contribution to margin of $2.1 million in 2011, $1.6 million in 2010 and
$15.1 million in 2009. For a discussion of our gas cost incentive sharing mechanism, see “Regulatory
Matters—Rate Mechanisms—Purchased Gas Adjustment,” above.

Gas Storage

Our gas storage segment consists of the non-utility portion of our Mist underground storage

facility and our 75 percent ownership interest in the Gill Ranch facility. For the year ended
December 31, 2011, we earned $4.1 million, or 15 cents per share, from gas storage compared to $6.1
million, or 23 cents per share, for 2010. The primary reason for the decline was lower storage pricing
driven by lower, more stable gas costs.

At Mist, we provide gas storage services to customers in the interstate and intrastate markets

primarily using storage capacity that has been developed in advance of core utility customers’
requirements. Under a regulatory incentive sharing mechanism in Oregon, we retain 80 percent of
pre-tax income from Mist gas storage services, and from asset management services, when the
underlying costs of the capacity being used are not included in our utility rates, and 33 percent of
pre-tax income from such storage and asset management services when the capacity being used is

64

included in utility rates. The remaining 20 percent and 67 percent, respectively, are credited to a
deferred regulatory account for credit to our core utility customers. We have a similar sharing
mechanism in Washington for pre-tax income derived from gas storage and asset management
services.

Our 75 percent undivided ownership interest in the Gill Ranch facility is held by our wholly-
owned subsidiary Gill Ranch, which is also the operator of the project. Our portion of the facility is
currently designed to provide 15 Bcf of gas storage capacity by the end of 2012. Gill Ranch
commenced operations at the end of October 2010 and had approximately 13 Bcf of storage capacity
available for contracting to customers beginning April 1, 2011, which was the beginning of the first
full storage injection season at Gill Ranch, after a partial injection season, which commenced in
October 2010. See Note 4.

Other

Our other business segment consists of NNG Financial, an investment in PGH, and other

non-utility investments and business activities. NNG Financial had total assets of $1.1 million as of
both December 31, 2011 and 2010 primarily reflecting a non-controlling minority interest in the Kelso-
Beaver interstate gas transmission pipeline. Our equity investment in PGH as of December 31, 2011
and 2010 was $13.5 million and $14.8 million, respectively. Total earnings from our other business
segment as of December 31, 2011 and 2010 was a net loss of $0.7 million and net income of $0.3
million, respectively. The loss for 2011 was primarily due to approximately $1.3 million of charges on
our investment in PGH. See Note 4.

Consolidated Operations

Operations and Maintenance

Operations and maintenance expense was $125.3 million in 2011, compared to $121.0 million

in 2010, an increase of $4.3 million or 4 percent. The following summarizes the major factors that
contributed to changes in operations and maintenance expense:

2011 compared to 2010:

•

•

•

•

•

a $3.2 million increase in operating expenses at Gill Ranch related to the first full year of
operations;
a $2.3 million increase in utility payroll expense related to additional field support staff and
general pay increases;
a $1.2 million increase in utility health care costs and other related employee benefit
expense (see further discussion below);
a $1.5 million increase in other non-payroll expense at the utility for costs related to the
general rate case of $0.7 million, storage leases of $0.3 million, and pipeline integrity and
corporate ethics initiatives of $0.2 million; and
a $0.2 million increase in utility bad debt expense (see further discussion below).

Partially offsetting the above factors were:

•

a $1.8 million decrease in performance bonuses at the utility based on below-target results
compared to last year;

65

•

•

a $1.5 million decrease in pension expense due to the regulatory deferral of costs above the
amount net in rates (see further discussion below); and
a $1.0 million decrease in specific consulting and legal fees which were incurred by the
utility in 2010 related to our successful property tax appeal.

2010 compared to 2009:

•

•
•

•

•

a $5.6 million decrease in utility payroll expense related to a reduced number of employees.
There was a reduction of 105 employees or 9 percent over the two year period beginning
January 2009;
a $2.4 million decrease in utility bad debt expense (see further discussion below);
a $1.9 million decrease in pension expense, due to the increase in market value of plan
investments from contributions in 2009 and 2010;
a $1.5 million decrease in health care and other employee benefit expense due to reduced
employee count, offset by an increase in healthcare premiums (see further discussion
below); and
a $0.2 million decrease in damage claims in 2010.

Partially offsetting the above increases were:

•

•

a $4.9 million increase in gas storage expenses, primarily related to start-up costs including
salaries and benefits, power costs, legal fees and investment bank consulting costs; and
a $1.0 million increase for consulting and legal fees at the utility related to a successful
property tax appeal.

Our bad debt expense as a percent of revenues was 0.23 percent for the year ended

December 31, 2011, compared to 0.21 percent for the same period last year. The comparative increase
in our bad debt expense ratio was largely due to lower than normal expense ratio in 2010 due to
improved collections and higher recoveries of delinquent account balances. Despite the modest
increase, we believe bad debt losses are comparable to last year and credit risks remain elevated due to
the weak economy and high unemployment rates. Higher customer usage from colder weather these
past few months may increase our exposure to credit losses in the near term, but we expect bad debt
expense over the long term to remain below 0.5 percent of revenues.

Overall national healthcare spending has slowed as a result of the weak economy; however,
healthcare trends for the cost of the services provided are forecasted to continue to rise at around 10
percent to 11 percent year over year. Initial projections for increases to employer paid premiums for
2012 are estimated to be between 7 percent and 9 percent. Based on our actual premium increase for
2012, NW Natural’s employer paid portion of health premiums (medical, dental, vision) are expected
to increase 6 percent.

In addition, total pension costs are expected to increase in 2012. However, effective January 1,
2011 the OPUC approved the deferral of utility pension expense above the amount recovered in rates,
which was set in our last general rate case. The pension expense deferral is recorded to a regulatory
balancing account, which reduced operations and maintenance expense by $6.0 million for 2011, and
we expect additional cost deferrals to the pension balancing account in 2012 at or above the levels of
2011. For further explanation of the pension balancing account, see “Regulatory Matters—Rate
Mechanisms—Pension Deferral,” above.

66

General Taxes

General taxes, which are principally comprised of property and payroll taxes and regulatory

fees, increased $5.4 million, or 23 percent, in 2011 compared to 2010, and decreased $4.4 million, or
16 percent, in 2010 compared to 2009. The major factors that contributed to changes in general taxes
are:

2011 compared to 2010:

•

•

a $5.2 million increase due to the refund of property taxes in 2010 pursuant to a favorable
ruling from the Oregon Supreme Court regarding taxation of utility gas inventory held for
sale (see further discussion below); and
a $1.3 million increase in property taxes at Gill Ranch as a result of the first full year of
operations.

2010 compared to 2009:

•

a $5.2 million decrease due to the refund of property taxes received in 2010, as mentioned
above, partially offset by an increase in property taxes related to a 2 percent increase in net
utility plant balances.

Prior to 2011, we had been involved for a number of years in litigation with the ODOR over

whether inventories held for sale were required to be taxed as personal property. In January 2010, the
Oregon Supreme Court unanimously ruled in our favor, stating that these inventories were exempt
from property tax. As a result of this ruling, we were entitled to a refund of approximately $5.2 million,
plus accrued interest, for property taxes paid on inventories beginning with the 2002-03 tax year. We
recognized a net $6.1 million increase in pre-tax income in the first quarter of 2010, which consisted of
$5.2 million for the refund of property taxes, $1.9 million for accrued interest income, and $1.0 million
of increased operations and maintenance expense for legal and consulting services. We received all of
the property tax refunds in 2010.

Depreciation and Amortization

Total depreciation and amortization expense in 2011 increased by $4.9 million, or 7 percent, as

compared to a $2.3 million or 4 percent increase in 2010 over 2009. The increased expense in 2011
was primarily related to an increase of $3.7 million in Gill Ranch’s depreciation, plus additional
depreciation on investments in utility plant for customer growth and system improvements. The
increased expense in 2010 was primarily related to $1.1 million of depreciation at Gill Ranch as they
went into service in the fourth quarter of 2010, plus additional depreciation on investments in utility
plant.

67

Other Income and Expense—Net

The following table provides details on other income and expense—net for the last three years:

Thousands

Gains from company-owned life insurance
Interest income
Income (loss) from equity investments
Net interest on deferred regulatory accounts
Gain (loss) on sale of investments
Other non-operating

Total other income and expense—net

2011 compared to 2010:

2011

2010

2009

$ 2,247
50
(1,641)
5,999
(96)
(2,036)

$ 2,042
2,024
588
4,692
223
(2,467)

$ 3,416
211
1,329
2,051
45
(3,338)

$ 4,523

$ 7,102

$ 3,714

Other income and expense—net decreased $2.6 million, primarily due to $1.9 million of

interest income received from the property tax refund in 2010 which did not occur in 2011, a $1.4
million loss from equity investments due to Palomar charges (see Note 12), partially offset by a $1.3
million increase in interest and carrying costs from regulatory account balances largely due to smaller
balances in gas costs between 2011 and 2010. See discussion of Palomar in “Strategic Opportunities—
Pipeline Diversification” above.

2010 compared to 2009:

Other income and expense—net increased $3.4 million, primarily due to $1.9 million of interest

income related to property tax refund plus a $2.6 million increase in interest from regulatory account
balances largely due to smaller balances in gas costs between 2010 and 2009, partially offset by a $1.4
million decrease in income from life insurance due to higher policy gains realized in 2009.

Interest Expense—Net

Interest expense—net of amounts capitalized in 2011 decreased by $0.5 million, or 1 percent,

compared to 2010, and increased in 2010 by $1.9 million, or 5 percent, compared to 2009. The current
year decrease was primarily due to a $1.9 million savings from interest expense on long-term debt as a
result of bonds that were redeemed in 2010, partially offset by a $1.1 million increase for gas storage
interest expense related to the Gill Ranch base gas agreement, as well as the issuance of $50 million of
3.176 percent medium term notes (MTN’s) in September 2011 and the issuance of $40 million of
subsidiary senior secured notes with an average interest rate of 7.38 percent for Gill Ranch in
November 2011. The increases in 2010 compared to 2009 reflect the issuance of long-term debt during
2009, which included $75 million of 5.37 percent MTN’s issued in March 2009 and $50 million of
3.95 percent MTN’s issued in July 2009, and higher short-term debt balances. Interest expense also
reflects a lower average interest rate used in calculating the allowance for funds used during
construction, which is referred to as AFUDC. AFUDC rates, comprised of short-term and long-term
capital costs as appropriate, were 0.5 percent in 2011, 0.6 percent in 2010 and 1.0 percent in 2009.

Income Tax Expense

The decrease in income tax expense of $6.1 million, or 12 percent, compared to 2010 was

primarily due to lower pre-tax consolidated earnings. Effective tax rate for 2011 and 2010 was 40.4
percent, compared to 40.5 percent in 2010 and 38.3 percent in 2009. Income tax expense increased
$2.8 million, or 6 percent, for the year ended December 31, 2010 compared to 2009, primarily due to
higher pre-tax consolidated earnings and a slightly higher effective tax rate.

68

For the 2011 tax year, the lower effective tax rate was primarily due to a decrease in state tax

expense (see further discussion below). For the 2010 tax year, the higher effective tax rate was
primarily the result of increased amortization of our regulatory tax account on pre-1981 utility plant
assets (see “Regulatory Matters—Rate Mechanisms,” above) and a lower non-taxable gain on
company-owned life insurance. For more information on our income taxes, including a reconciliation
between the statutory federal and state income tax rates and the effective rate, see Note 2 and Note 10.

In July 2009, the governor of Oregon signed House Bill 3405 establishing increases in the state

income tax rate for corporations, and Oregon voters approved this legislation in January 2010. The
corporate income tax rate in Oregon increased from 6.6 percent to 7.9 percent for tax years 2009 and
2010 when taxable income was greater than $250,000. For tax years 2011 and 2012, the state income
tax rate decreased to 7.6 percent, and for years after 2012 the tax rate will return to 6.6 percent, except
for corporations with taxable income over $10 million the tax rate will remain at 7.6 percent.
Following existing accounting guidance on income taxes, we re-measured our deferred income tax
assets and liabilities, resulting in an adjustment to increase the balance by $3.6 million in
2009. Approximately $3.5 million of the adjustment was attributed to our utility operations. As we
anticipate future recovery in rates, we recorded a regulatory asset for the grossed up revenue
requirement. With respect to our non-utility business segments, a $0.1 million adjustment was charged
to income tax expense in 2009. In 2010 we decreased the deferred income tax liability by $0.8 million
as a result of the decrease from 7.9 percent to 7.6 percent. This decrease was almost entirely
attributable to the utility business.

Financial Condition

Capital Structure

One of our long-term goals is to maintain a strong consolidated capital structure, generally
consisting of 45 to 50 percent common stock equity and 50 to 55 percent long-term and short-term
debt. When additional capital is required, debt or equity securities are issued depending upon both the
target capital structure and market conditions. These sources of financing are also used to fund long-
term debt redemptions and short-term commercial paper maturities (see “Liquidity and Capital
Resources,” below, and Notes 7 and 8). Achieving the target capital structure and maintaining
sufficient liquidity to meet operating requirements are necessary to maintain attractive credit ratings
and have access to capital markets at reasonable costs. Our consolidated capital structure was as
follows for the years ended December 31, 2011 and 2010:

Common stock equity
Long-term debt
Short-term debt, including current maturities of long-term debt

Total

Liquidity and Capital Resources

December 31,

2011

46.5%
41.7%
11.8%

100%

2010

44.7%
38.1%
17.2%

100%

At December 31, 2011, we had $5.8 million of cash and cash equivalents, compared to $3.5

million at December 31, 2010. We also had $4.0 million in restricted cash at Gill Ranch as of
December 31, 2011, which is being held as collateral for long-term debt outstanding, compared to $0.9
million as of December 31, 2010, which was being held as collateral for equipment purchase contracts

69

and construction loans. In order to maintain sufficient liquidity during periods of volatile capital
markets, at times we will maintain higher cash balances, add short-term borrowing capacity, and
potentially pre-fund utility capital expenditures when long-term fixed rate environments are
attractive. As a regulated entity, our issuance of equity securities and most forms of debt securities are
subject to approval by the OPUC and WUTC, and our use of proceeds from utility specific issuances
are restricted to certain utility purposes. Our use of retained earnings is not subject to those same
restrictions.

For the utility segment, our short-term liquidity is supported by cash balances, internal cash

flow from operations, proceeds from the sale of commercial paper notes, borrowings from multi-year
credit facilities, cash available from surrender value in company-owned life insurance policies, and
proceeds from the sale of long-term debt. We use utility long-term debt proceeds to finance utility
capital expenditures, refinance maturing debt of the utility and provide for general corporate purposes
of the utility.

Capital markets over the past few years, including the commercial paper market, experienced

significant volatility and tight credit conditions, but conditions have been improving as reflected by
tighter credit spreads and increased access to new financing for investment grade issuers. With our
current debt ratings (see “Credit Ratings,” below), we have been able to issue commercial paper and
MTNs at attractive rates and have not needed to borrow from our back-up credit facilities. In the event
that we are not able to issue new debt due to market conditions, we expect that our near term liquidity
needs can be met by using cash balances or, for the utility segment, drawing upon our committed credit
facilities. We also have a universal shelf registration filed with the SEC for the issuance of secured and
unsecured debt or equity securities, subject to market conditions and regulatory approvals. As of
December 31, 2011, we have OPUC approval to issue up to $125 million of additional MTNs under
the existing shelf registration for approved purposes.

In the event that our senior unsecured long-term debt credit ratings are downgraded, or our

outstanding derivative position exceeds a certain credit threshold, our counterparties under derivative
contracts could require us to post cash, a letter of credit or other form of collateral, which could expose
us to additional cash requirements and may trigger significant increases in short-term borrowings. If
the credit risk-related contingent features underlying these contracts were triggered on December 31,
2011, we could have been required to post up to $45.9 million of collateral to our counterparties, but
that assumes our long-term debt ratings were downgraded to non-investment grade levels, which would
be a very significant change from current rating levels for NW Natural (see Note 13 and “Credit
Ratings,” below).

Additionally, in July 2010, the U.S. Congress passed and President Obama signed into law the

“Wall Street Reform and Consumer Protection Act.” The legislation requires additional government
regulation of derivative and over-the-counter transactions, and could expand collateral requirements.
While we continue to evaluate the legislation to determine its impact, if any, on our hedging
procedures, results of operations, financial position and liquidity, we do not expect to know the full
impact of the legislation until final regulations implementing the legislation are issued.

Recent developments that may have a significant impact on our liquidity and capital resources
include pension contribution requirements, tax benefits, and environmental expenditures and insurance
recoveries. With respect to pension requirements, we expect to make significant contributions over the
next seven years until we are fully funded under the Pension Protection Act rules (see “Pension Cost

70

and Funding Status of Qualified Retirement Plans,” below). With respect to federal income tax
liabilities, an extension was granted that allows us to take 100 percent bonus depreciation on qualified
expenditures during 2011, and 50 percent bonus depreciation on a majority of our capital expenditures
in 2012, which will significantly reduce our tax liability for the 2011 and 2012 tax years thereby
providing cash flow benefits in late 2012 and 2013 (see “Cash Flows—Operating Activities,” below).
With respect to environmental liabilities, we expect to continue using cash resources to fund our
environmental liabilities, but we also anticipate recovering amounts through insurance or utility rates
over the next several years, although the amount and timing of these expenditures and recoveries is
uncertain (see Note 15).

Our storage segment’s short-term liquidity is supported by cash balances, internal cash flow
from operations, external financing, and to a certain extent on funding from its parent company. Gill
Ranch has a limited operational history, having begun operations in October 2010. Although we
anticipate operating cash flows to be sufficient for liquidity purposes, the amount and timing of these
cash flows are uncertain. In November 2011, Gill Ranch issued $40 million of senior secured notes,
with fixed interest rate component on $20 million and a variable interest rate on the remaining $20
million. The average combined interest rate on the notes was 7.38 percent per annum in 2011. These
notes are secured by our membership interest in Gill Ranch Storage, LLC, and are nonrecourse to NW
Natural. The maturity date of these notes is November 30, 2016.

Under the note agreements, Gill Ranch is subject to certain covenants and restrictions,

including but not limited to, a financial covenant that requires Gill Ranch to maintain minimum
adjusted EBITDA at various levels over the term of the notes. The minimum adjusted EBITDA
increases incrementally over the first few years, reaching its highest level in the 12-month period
beginning April 1, 2015. Under the agreements, Gill Ranch is also subject to a debt service reserve
requirement of 10 percent of the outstanding principal amount, initially $4 million, certain prepayment
penalties, restrictions on dividends out of Gill Ranch unless certain earnings ratios are met, and
restrictions on incurrence of additional debt.

Based on several factors, including our current credit ratings, our commercial paper program,

current cash reserves, committed credit facilities, and our expected ability to issue long-term debt
under our universal shelf registration, we believe our liquidity is sufficient to meet anticipated near-
term cash requirements, including all contractual obligations and investing and financing activities
discussed below.

Dividend Policy

We have paid quarterly dividends on our common stock each year since the stock was first

issued to the public in 1951. Annual common stock dividend payments per share, adjusted for stock
splits, have increased each year since 1956. The amount and timing of dividends payable on our
common stock is within the sole discretion of our Board of Directors. Subject to Board approval, we
expect to continue paying quarterly cash dividends on common stock. However, the declarations and
amount of future dividends will depend upon our earnings, cash flows, financial condition and other
factors including Board approval.

Off-Balance Sheet Arrangements

Except for certain lease and purchase commitments (see “Contractual Obligations,” below), we

have no material off-balance sheet financing arrangements.

71

Contractual Obligations

The following table shows our contractual obligations at December 31, 2011 by maturity and

type of obligation.

Thousands

Payments Due in Years Ending December 31,
2016
2014
2012

2013

2015

Thereafter

Total

Commercial paper
Long-term debt maturities
Interest on long-term debt
Postretirement benefit payments (1)
Capital leases
Operating leases
Gas purchases (2)
Gas pipeline commitments
Gas reserves (3)
Other purchase commitments

$141,600 $
40,000
39,056
21,430
443
4,929
98,534
94,491
59,040
-

- $
-
38,145
21,703
313
4,841
18,331
87,983
51,660
157

- $

- $

- $

60,000
37,984
22,245
118
5,078
15,290
82,898
49,200
82

40,000
36,489
22,789
23
5,042
5,651
72,316
41,820
37

65,000
33,518
23,482
-
5,018
-
61,358
-
-

- $ 141,600
681,700
413,503
245,627
897
49,567
137,806
686,587
201,720
13,835

476,700
228,311
133,978
-
24,659
-
287,541
-
13,559

Total

$499,523 $223,133 $272,895 $224,167 $188,376 $1,164,748 $2,572,842

(1)

The majority of postretirement benefit payments are related to our qualified defined benefit pension plans, which are
funded by plan assets and future cash contributions. See Note 9.

(2) Gas purchases include contracts which use price formulas tied to monthly index prices, plus hedged derivative

liabilities. Commitment amounts are based on futures prices as of December 31, 2011. For a summary of derivatives/
liabilities, see Note 13. For a summary of gas purchase commitments, see Note 15.

(3) Gas reserves contracts include provisions for cancelation, under which further payment would not be required.

Other purchase commitments primarily consist of remaining balances under existing purchase

orders. These and other contractual obligations are financed with cash from operations and from
issuance of short-term debt, which is periodically refinanced through the sale of long-term debt or
equity securities.

At December 31, 2011, 598 of our utility employees were members of the Office and
Professional Employees International Union Local No. 11. In July 2009, these union employees and
the Company agreed to a new five-year labor agreement called the Joint Accord. The Joint Accord
provides for a one percent automatic wage increase each year, plus the potential for us to an additional
two percent based on wage inflation and other factors. It also provides competitive health benefits
while limiting the cost increases for these benefits to the same level as the annual wage increases. The
term of the new Joint Accord extends to May 31, 2014, and thereafter from year to year unless either
party serves notice of its intent to negotiate modifications to the collective bargaining agreement.

Short-Term Debt

Our primary source of utility short-term liquidity is from internal cash flows and the sale of

commercial paper. In addition to issuing commercial paper to meet working capital requirements,
including seasonal requirements to finance gas inventories and accounts receivable, short-term debt
may also be used to temporarily fund utility capital requirements. Commercial paper is periodically
refinanced through the sale of long-term debt or equity securities. Our outstanding commercial paper,
which is sold through two commercial banks under an issuing and paying agency agreement, is
supported by one or more unsecured revolving credit facilities (see “Credit Agreements,” below). Our
commercial paper program did not experience any liquidity disruptions as a result of the credit
problems that affected issuers of asset-backed commercial paper and certain other commercial paper

72

programs over the last several years. At December 31, 2011 and 2010, our utility had commercial
paper outstanding of $141.6 million and $257.4 million, respectively. The effective interest rate on the
utility’s commercial paper outstanding at December 31, 2011 and 2010 was 0.3 percent and 0.4
percent, respectively.

In March 2009, Gill Ranch entered into a cash collateralized credit facility for up to $40

million, which was extended through September 30, 2010. In June 2010, Gill Ranch repaid its $40
million bank loan outstanding using the proceeds from its cash collateralized account. The effective
interest rate on the Gill Ranch credit facility was 0.8 percent during 2010.

Credit Agreements

We have a syndicated multi-year credit agreement for unsecured revolving loans totaling $250

million. The original term of this credit agreement was extended through May 31, 2013. All lenders
under our syndicated agreement are major financial institutions with committed balances and
investment grade credit ratings as of December 31, 2011 (see table below). We also had three bilateral
credit agreements totaling $50 million in effect from November 30, 2010 through March 31, 2011 for
seasonal working capital needs.

Lender rating, by category

AAA/Aaa
AA/Aa
A/A
BBB/Baa

Total

Loan Commitment
(In Thousands)
Syndicated
Facility

-
$
230,000
20,000
-

$250,000

Based on credit market conditions, it is possible that one or more lending commitments could
be unavailable to us if the lender defaulted due to lack of funds or insolvency. However, based on our
current assessment of our lenders’ creditworthiness, including a review of capital ratios, credit default
swap spreads and credit ratings, we believe the risk of lender default is minimal.

As discussed above, we extended commitments with all of our lenders under the $250 million

syndicated agreement through May 31, 2013. This syndicated agreement also allows us to request
increases in the total commitment amount from time to time, up to a maximum amount of $400
million. This syndicated agreement also permits the issuance of letters of credit in an aggregate amount
up to the applicable total borrowing commitment.

Any principal and unpaid interest amounts owed on borrowings under the credit agreements are
due and payable on or before the maturity date. There were no outstanding balances under these credit
agreements at December 31, 2011 and 2010. These agreements require us to maintain a consolidated
indebtedness to total capitalization ratio of 70 percent or less. Failure to comply with this covenant
would entitle the lenders to terminate their lending commitments and accelerate the maturity of all
amounts outstanding. We were in compliance with this covenant at December 31, 2011 and 2010, with
consolidated indebtedness to total capitalization ratios of 53.5 percent and 55.4 percent, respectively.

73

The syndicated agreement also requires that we maintain credit ratings with S&P and Moody’s

and notify the lenders of any change in our senior unsecured debt ratings by such rating agencies. A
change in our debt ratings by S&P or by Moody’s is not an event of default, nor is the maintenance of a
specific minimum level of debt rating a condition of drawing upon the credit agreement. However, a
change in our debt rating below BBB- by S&P or Baa3 by Moody’s would require additional approval
from the OPUC prior to issuance of utility debt, and interest rates on any loans outstanding under the
credit agreements are tied to debt ratings, which would increase or decrease the cost of any loans under
the credit agreements when ratings are changed (see “Credit Ratings,” below).

Credit Ratings

Our debt credit ratings are a factor in our liquidity, affecting our access to the capital markets,

including the commercial paper market. Our debt credit ratings also have an impact on the cost of
funds and the need to post collateral under derivative contracts. A change in our ratings below BBB-
by S&P or Baa3 by Moody’s would require additional approval from the OPUC prior to our issuing
additional long-term debt.

The following table summarizes our NW Natural debt ratings from S&P and Moody’s at

December 31, 2011:

Commercial paper (short-term debt)
Senior secured (long-term debt)
Senior unsecured (long-term debt)
Corporate credit rating
Ratings outlook

S&P

A-1
A+
n/a
A+
Stable

Moody’s

P-1
A1
A3
n/a
Stable

The above credit ratings are dependent upon a number of factors, both qualitative and

quantitative, and are subject to change at any time. The disclosure of these credit ratings is not a
recommendation to buy, sell or hold NW Natural securities. Each rating should be evaluated
independently of any other rating.

Redemptions of Long-Term Debt

We redeemed MTN’s during 2011, 2010 and 2009 as follows:

Thousands (Years ended December 31)

Medium-Term Notes

6.65% Series B due 2027 (1)
4.11% Series B due 2010
7.45% Series B due 2010
6.665% Series B due 2011

Amounts Redeemed

2011

2010

2009

$

-
-
-
10,000

$

-
10,000
25,000
-

$10,000

$35,000

$300
-
-
-

$300

(1)

In November 2009, $0.3 million of our 6.65 percent secured MTNs due 2027 were redeemed pursuant to a one-time put
option. This one-time put option has now expired, and the $19.7 million remaining principal outstanding is expected to
be paid at maturity in November 2027.

74

Cash Flows

Operating Activities

2011 compared to 2010:

For the year ended December 31, 2011, cash flow from operating activities totaled $233.5

million compared to $126.5 million in 2010 and $240.3 million in 2009. The significant factors
contributing to changes in operating cash flow in 2011 compared to 2010 are as follows:

•

•

•

•

•

•

•

an increase of $85.7 million from accrued taxes, primarily related to bonus depreciation
which resulted in federal tax refunds of $36.6 in 2011 and a net operating loss (NOL)
carryforward;
an increase of $34.7 million from changes in deferred gas costs, which reflects a higher
level of gas cost savings which will be refunded to utility customers in subsequent years’
PGA;
an increase of $33.4 million from insurance recoveries for environmental claims, net of
deferred environmental expenditures in 2011;
an increase of $12.0 million from changes in accounts payable due to decreased
construction activity at Gill Ranch;
a decrease of $29.5 million from changes in deferred tax liabilities primarily reflecting
higher tax benefits in 2010 compared to 2011, largely driven by utility and Gill Ranch
bonus depreciation for investments placed in service during 2010;
a decrease of $22.1 million from changes in receivables primarily due to higher balances at
the end of 2009, which benefitted cash flows during 2010; and
a decrease of $12.0 million from higher pension contributions due to a decline in interest
rates and asset values, which increased pension funding requirements.

In September 2010, Congress passed the Unemployment Insurance, Reauthorization and Job
Creation Act of 2010 (the Jobs Act) and the legislation was signed into law by President Obama. The
Jobs Act extended for one year the temporary bonus depreciation rules first enacted in the Economic
Stimulus Act of 2008 and subsequently renewed in the American Recovery and Reinvestment Act of
2009. Under the bonus depreciation provision, and additional first-year tax deduction was allowed for
depreciation equal to 50 percent of the adjusted basis of qualified property through September 8, 2010,
in the year the property was placed in service, with the remaining percentage recovered under the
normal depreciation rules. In addition, on December 17, 2010, President Barack Obama signed into
law the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 (the Tax
Relief Act), which allows 100 percent bonus depreciation for qualified property placed in service
between September 9, 2010 through December 31, 2011. It also extended the 50 percent bonus
depreciation deduction to qualifying property placed in service in 2012. As a result of this legislation,
we generated a tax net operating loss in 2010 which was carried back to the tax year 2009, resulting in
a federal income tax refund of $22.3 million which we received in 2011. We also recognized an
increase in our cash flow by reducing our current tax liabilities for the 2011 and 2012 tax years. As of
December 31, 2011, we have a federal and state income tax receivable balance of $7.0 million, which
we expect to realize in cash flows during 2012.

75

2010 compared to 2009:

•

•
•
•

•

•

•

•

an increase of $39.6 million from deferred income taxes, primarily reflecting higher tax
benefits from bonus depreciation taken in 2010 related to Gill Ranch capital investments
placed in service;
an increase of $15.0 million from a smaller pension contribution in 2010 compared to 2009;
an increase of $10.1 million from the 2009 settlement of an interest rate hedge;
a decrease of $75 million from accrued taxes, primarily related to 2010 benefits that will be
refunded in 2011, and due to tax refunds received in 2009 related to a change in tax
accounting method for repairs and maintenance costs;
a decrease of $62.9 million from changes in deferred gas cost regulatory account which
reflects actual gas prices compared to estimated gas prices embedded in customer rates;
a decrease of $19.7 million from changes in receivables primarily due to higher balances at
the end of 2008, which benefitted cash flows during 2009;
a decrease of $14.5 million from changes in inventories primarily due to higher price of gas
in inventory at the end of 2008, which benefitted cash flows during 2009 as higher cost
inventories were recovered through utility rates; and
a decrease of $13.0 million in accounts payable due to decreased Gill Ranch construction
activity at the end of 2010 compared to the end of 2009.

We have lease and purchase commitments relating to our operating activities that are financed

with cash flows from operations. For information on cash flow requirements related to leases and other
purchase commitments, see “Contractual Obligations,” above and Note 15.

Investing Activities

Cash used in investing activities for the year ended December 31, 2011 totaled $153.1 million,
down from $212.9 million for the same period in 2010. Our capital expenditures were $100.5 million
in the year ended December 31, 2011, down from $248.5 million for the same period in 2010. Capital
expenditures decreased in non-utility construction activity in 2011, which were largely due to Gill
Ranch construction expenditures in 2010. We also invested $50.6 million in utility gas reserves in 2011
under the agreement with Encana discussed earlier.

Restricted cash decreased $37.7 million compared to 2010, due to settling our $40 million cash

collateralized loan in June 2010, partially offset by a $4 million restricted cash collateral requirement
imposed under the new Gill Ranch debt issued in 2011 (see Financing Activities, below).

Over the five-year period 2012 through 2016, total utility capital expenditures are estimated to

be between $400 and $500 million and utility expenditures for gas reserves are estimated to be $200
million. The estimated level of utility capital expenditures over the next five years reflects assumptions
for customer growth, storage development for the utility, technology investments and utility
distribution improvements, including requirements under current pipeline safety programs. Most of the
required funds are expected to be internally generated over the five-year period, and any remaining
funding will be obtained through the issuance of long-term debt or equity securities, with short-term
debt providing liquidity and bridge financing.

In 2012, we expect to spend less than $15 million on non-utility development projects,

including the storage businesses and Palomar. Storage business capital expenditures in 2012 are

76

expected to be paid primarily from working capital, and potentially with additional funds from NW
Natural. Palomar expects to continue working on revised plans for the east pipeline segment, including
plans to conduct an open season to re-evaluate regional needs. The initial planning and permitting costs
have been financed with equity funds from NW Natural and our partner, TransCanada American
Investments Ltd. For more information, see Note 12 and “Strategic Opportunities—Pipeline
Diversification,” above.

Financing Activities

Cash used in financing activities for the year ended December 31, 2011 totaled $78.0 million,

down significantly from cash provided of $81.4 million for the same period in 2010. Our short-term
debt balances decreased $115.8 million for the year ended December 31, 2011, compared to an
increase of $155.4 million for the same period in 2010. We also redeemed $10 million of long-term
debt in June of 2011. This was offset by long-term debt issuances of $50 million in September 2011 by
the utility and $40 million in November 2011 by Gill Ranch. We continue to use long-term debt
proceeds primarily to finance capital expenditures, refinance short-term and long-term debt maturities
as well as for general corporate purposes.

We have a repurchase program approved through May 2011 which provides authorization to

repurchase up to 2.8 million shares of NW Natural common stock or up to $100 million. The purchases
are made in the open market or through privately negotiated transactions. No repurchases were made in
2011, 2010 or 2009 under the program. Since the program’s inception, we have repurchased an
aggregate 2.1 million shares of common stock at a total cost of $83.3 million, at the average price of
$39.19 per share (see Part II, Item 5, “Market for the Registrant’s Common Equity, Related
Stockholder Matters and Issuer Purchases of Equity Securities,” above).

Free Cash Flow

Free cash flow is the amount of cash remaining after the payment of all cash expenses, capital

expenditures and investment activities, and dividends. Free cash flow is a non-GAAP financial
measure, but we believe this supplemental information enables the reader of the financial statements to
better understand our cash generating ability of the Company and to benefit from seeing cash flow
results from management’s perspective in addition to the traditional GAAP presentation. We monitor
free cash flow as one measure of our return on investments. Provided below is a reconciliation from
cash provided by operations (GAAP basis) to our non-GAAP free cash flow.

Thousands

Cash provided by operating activities
Cash used in investing activities
Cash dividend payments on common stock

Free cash flow

2011

2010

2009

$ 233,462
(153,065)
(46,690)

$ 126,469
(212,871)
(44,652)

$ 240,335
(162,141)
(42,415)

$ 33,707

$(131,054) $ 35,779

The free cash flow information presented above is not intended to be a substitute for, nor is it

meant to be a better measure of, cash flow results prepared in accordance with GAAP. In addition, the
non-GAAP measure we provide may be calculated differently by other companies that present a
similar non-GAAP financial measure for cash flow.

77

Pension Cost and Funding Status of Qualified Retirement Plans

Pension costs are determined in accordance with accounting standards for compensation and
retirement benefits (see “Application of Critical Accounting Policies and Estimates—Accounting for
Pensions and Postretirement Benefits,” above). Pension costs for our two qualified defined benefit
plans, which are allocated between operation and maintenance expenses, capital expenditures and the
deferred regulatory balancing account totaled $16.3 million in 2011, an increase of $4.9 million from
2010. See Note 9 for additional details.

The fair market value of pension assets in these two plans decreased to $216.0 million at

December 31, 2011 from $219.0 million at December 31, 2010. The decrease was due to a negative
return on plan assets of $6.7 million and benefit payments of $16.6 million, offset by $20.2 million in
employer contributions.

We make contributions to company-sponsored qualified defined benefit pension plans based on

actuarial assumptions and estimates, tax regulations and funding requirements under federal law. Our
qualified defined benefit pension plans were underfunded by $146.9 million at December 31, 2011. We
plan to make contributions during 2012 of approximately $28 million. For more information on the
funding status of our qualified retirement plans and other postretirement benefits, see Note 9.

We also contribute to a multiemployer pension plan for our employees (the Union Plan, or

otherwise known as Western States Plan) pursuant to our collective bargaining agreement. We made
contributions totaling $0.4 million to the Union Plan in both 2011 and 2010. See Note 9 for further
disclosures.

Ratios of Earnings to Fixed Charges

For the years ended December 31, 2011, 2010 and 2009, our ratios of earnings to fixed charges,

computed using the Securities and Exchange Commission method, were 3.41, 3.73, and 3.86,
respectively. For this purpose, earnings consist of net income before taxes plus fixed charges, and fixed
charges consist of interest on all indebtedness, the amortization of debt expense and discount or
premium and the estimated interest portion of rentals charged to income. See Exhibit 12.

Contingent Liabilities

Loss contingencies are recorded as liabilities when it is probable that a liability has been

incurred and the amount of the loss is reasonably estimable in accordance with accounting standards
for contingencies (see “Application of Critical Accounting Policies and Estimates,” above). At
December 31, 2011, we had a regulatory asset of $105.7 million for deferred environmental costs. If it
is determined that both the insurance recovery and future customer rate recovery of such costs are not
probable, then the costs will be charged to expense in the period such determination is made. For
further discussion of contingent liabilities, see Note 15.

New Accounting Pronouncements

For a description of recent accounting pronouncements that may have an impact on our

financial condition, results of operations or cash flows, see Note 2.

78

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to various forms of market risk including commodity supply risk, commodity

price risk, interest rate risk, foreign currency risk, credit risk and weather risk. The following describes
our exposure to these risks.

Commodity Supply Risk

We enter into spot, short-term and long-term natural gas supply contracts, along with associated
pipeline transportation contracts, to manage our commodity supply risk. Historically, we have arranged
for physical delivery of an adequate supply of gas, including gas in our Mist storage facility, to meet
the expected requirements of our core utility customers. Our gas purchase contracts are primarily
index-based and subject to monthly re-pricing, a strategy that is intended to reflect market price trends
during the upcoming year.

Commodity Price and Storage Value Risk

Natural gas commodity prices and storage values are subject to market fluctuations due to
unpredictable factors including weather, pipeline transportation congestion, drilling technologies,
potential market speculation and other factors that affect short-term supply and demand. In addition to
managing storage positions through a combination of short- and long-term fixed price contracts, we
use commodity-price financial swap and option contracts (financial hedge contracts) to convert certain
natural gas supply contracts from floating prices to fixed or capped prices, and physical gas reserves
from a long-term investment with Encana, for utility gas purchase requirements. These financial hedge
contracts and gas reserve volumes are generally included in our annual PGA filing for recovery,
subject to a regulatory prudence review. We also regularly monitor and manage the financial exposure
and liquidity risk of our storage position.

Interest Rate Risk

We are exposed to interest rate risk primarily associated with new debt financing needed to
fund capital requirements, including future contractual obligations and maturities of long-term and
short-term debt. Interest rate risk is primarily managed through the issuance of fixed-rate debt with
varying maturities. We may also enter into financial derivative instruments, including interest rate
swaps, options and other hedging instruments, to manage and mitigate interest rate exposure.

Foreign Currency Risk

The costs of certain natural gas commodity supplies and certain pipeline services purchased

from Canadian suppliers are subject to changes in the value of the Canadian currency in relation to the
U.S. currency. Foreign currency forward contracts are used to hedge against fluctuations in exchange
rates for our commodity and commodity related demand charges paid in Canadian dollars. At
December 31, 2011 and 2010, notional amounts under foreign currency forward contracts totaled $12.3
million and $13.9 million, respectively. As of December 31, 2011 , all foreign currency forward
contracts mature within one year. If all of the foreign currency forward contracts had been settled on
December 31, 2011, a loss of $0.2 million would have been realized (see Note 13).

79

Credit Risk

Credit exposure to suppliers. Certain suppliers that sell us gas have either relatively low
credit ratings or are not rated by major credit rating agencies. To manage this supply risk, we purchase
gas from a number of different suppliers at liquid exchange points. We evaluate and monitor suppliers’
creditworthiness and maintain the ability to require additional financial assurances, including deposits,
letters of credit or surety bonds, in case a supplier defaults. In the event of a supplier’s failure to deliver
contracted volumes of gas, the regulated utility would need to replace those volumes at prevailing
market prices, which may be higher or lower than the original transaction prices. We believe these
costs would be subject to the PGA sharing mechanism discussed above. Since most of our commodity
supply contracts are priced at the monthly market index price tied to liquid exchange points, and we
have significant storage flexibility, we believe that it is unlikely that a supplier default would have an
adverse effect on our financial condition or results of operations.

Credit exposure to financial derivative counterparties. Based on estimated fair value at
December 31, 2011, our overall credit exposure relating to commodity hedge contracts is considered to
be immaterial as it reflects amounts we owed to our financial derivative counterparties totaling $63.5
million. However, changes in natural gas prices could result in counterparties owing us money.
Therefore our financial derivatives policy requires counterparties to have at least an investment-grade
credit rating at the time the derivative instrument is entered into, and specific limits on the contract
amount and duration based on each counterparty’s credit rating. Due to potential changes in market
conditions and credit concerns, we continue to enforce strong credit requirements. We actively monitor
and manage our derivative credit exposure and place counterparties on hold for trading purposes or
require cash collateral, letters of credit or guarantees as circumstances warrant. As of December 31,
2011, we do not have any actual derivative credit risk exposure, which reflects amounts that financial
derivative counterparties owe to us.

The following table summarizes our overall credit exposure, based on estimated fair value, and

the corresponding counterparty credit ratings. The table uses credit ratings from S&P and Moody’s,
reflecting the higher of the S&P or Moody’s rating or a middle rating if the entity is split-rated with
more than one rating level difference:

Thousands

AAA/Aaa
AA/Aa
A/A
BBB/Baa

Total

Financial Derivative Position by Credit Rating
Unrealized Fair Value Gain (Loss)
2010
2011

$
-
(57,542)
(5,924)
-

$(63,466)

$
-
(43,656)
(9,017)
-

$(52,673)

In most cases, we also mitigate the credit risk of financial derivatives by having master netting

arrangements with our counterparties which provide for making or receiving net cash settlements.
Generally, transactions of the same type in the same currency that have a settlement on the same day
with a single counterparty are netted and a single payment is delivered or received depending on which
party is due funds.

Additionally we have master contracts in place with each of our derivative counterparties that

include provisions for posting or calling for collateral. Generally we can obtain cash or marketable

80

securities as collateral with one day’s notice. We use various collateral management strategies to
reduce liquidity risk. The collateral provisions vary by counterparty but are not expected to result in the
significant posting of collateral, if any. We have performed stress tests on the portfolio and concluded
that the liquidity risk from collateral calls is not material. Our derivative credit exposure is primarily
with investment grade counterparties rated AA-/Aa3 or higher. Contracts are diversified across
counterparties to reduce credit and liquidity risk.

Credit exposure to insurance companies for environmental damage claims. We regularly

monitor the financial condition of insurance companies who provide or provided general liability
insurance policy coverage to NW Natural and its predecessors with respect to environmental damage
claims. We have filed claims for our environmental costs with a number of insurance companies. The
majority of these companies have credit ratings of A- or better from A.M. Best Co. (AM Best). AM
Best is a global independent credit rating agency who has provided quantitative and qualitative
analysis of insurance company balance sheet strength for over 100 years. AM Best uses a rating scale
that ranges from A++ (“Superior” financial strength) to F (“In Liquidation”), with a rating of A-
considered “Excellent.” A strong credit rating from AM Best is not a guarantee that an insurance
company will be able to meet its contractual obligations. The remaining insurance companies who do
not have credit ratings of A- or better are expected to have sufficient funds in reserves to cover these
claims. Our credit exposure to insurance companies for environmental claims, which reflects amounts
we believe are owed to us, could be material. In the event we are unable to recover environmental
expenses from these insurance policies, we will seek recovery of unreimbursed amounts through
customer rates.

Weather Risk

We are exposed to weather risk primarily from our regulated utility business. A large
percentage of our utility margin is volume driven, and current rates are based on an assumption of
average weather. In 2003, the OPUC approved a weather normalization mechanism for residential and
commercial customers. This mechanism affects customer bills between December 1 through May 15 of
each winter heating season, increasing or decreasing the margin component of customers’ rates to
reflect gas usage based on “average” weather using the 25-year average temperature for each day of
the billing period. The mechanism is intended to stabilize the recovery of our utility’s fixed costs and
reduce fluctuations in customers’ bills due to colder or warmer than average weather. Customers in
Oregon are allowed to opt out of the weather normalization mechanism. As of December 31, 2011,
approximately 9 percent of our Oregon customers had opted out. In addition to the Oregon customers
opting out, our Washington residential and commercial customers account for approximately 10
percent of our total customer base and are not covered by weather normalization. The combination of
Oregon and Washington customers not covered by a weather normalization mechanism is less than 20
percent of all residential and commercial customers.

81

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Table of Contents

1.

2.

3.

4.

5.

Management’s Report on Internal Control Over Financial Reporting . . . . . . . . . . . . . . . . .

Report of Independent Registered Public Accounting Firm . . . . . . . . . . . . . . . . . . . . . . . .

Consolidated Financial Statements:

Consolidated Statements of Comprehensive Income for the Years Ended December 31,

2011, 2010 and 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Consolidated Balance Sheets at December 31, 2011 and 2010 . . . . . . . . . . . . . . . . . . . . . .

Page

83

84

85

86

Consolidated Statements of Shareholders’ Equity for the Years Ended December 31,

2011, 2010 and 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

88

Consolidated Statements of Cash Flows for the Years Ended December 31, 2011, 2010

and 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Notes to Consolidated Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

89

90

Quarterly Financial Information (unaudited) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

130

Supplementary Data for the Years Ended December 31, 2011, 2010 and 2009:

Financial Statement Schedule

Schedule II—Valuation and Qualifying Accounts and Reserves . . . . . . . . . . . . . . . . . . . .

131

Supplemental Schedules Omitted

All other schedules are omitted because of the absence of the conditions under which they are
required or because the required information is included elsewhere in the financial statements

82

MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Management is responsible for establishing and maintaining adequate internal control over

financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of
1934, as amended. Our internal control over financial reporting is 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 in the United States of
America (GAAP). Our 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 involving company assets;

(ii) provide reasonable assurance that transactions are recorded as necessary to permit the

preparation of financial statements in accordance with GAAP, and that receipts and expenditures
are being made only in accordance with authorizations of management and the Board of
Directors; and

(iii) provide reasonable assurance regarding prevention or timely detection of the

unauthorized acquisition, use or disposition of our 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 or fraud. 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.

Management assessed the effectiveness of our internal control over financial reporting as of

December 31, 2011. In making this assessment, management used the criteria set forth by the
Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-
Integrated Framework.

Based on our assessment and those criteria, management has concluded that we maintained

effective internal control over financial reporting as of December 31, 2011.

The effectiveness of internal control over financial reporting as of December 31, 2011 has been

audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated
in their report which appears in this annual report.

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer

/s/ David H. Anderson
David H. Anderson
Senior Vice President and Chief Financial Officer

February 28, 2012

83

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of
Northwest Natural Gas Company:

In our opinion, the consolidated financial statements listed in the accompanying table of contents present fairly, in all
material respects, the financial position of Northwest Natural Gas Company and its subsidiaries at December 31,
2011 and 2010, and the results of their operations and their cash flows for each of the three years in the period
ended December 31, 2011 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 accompanying table of
contents 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, 2011, 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 schedule,
for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal
control over financial reporting, included in the accompanying Management’s Report on Internal Control over
Financial Reporting. Our responsibility is to express opinions on these financial statements, on the financial statement
schedule, 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

Portland, Oregon
February 28, 2012

84

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Thousands, except per share amounts (year ended December 31)

2011

2010

2009

Operating revenues:

Gross operating revenues
Less: Cost of sales

Revenue taxes

Net operating revenues

Operating expenses:

Operations and maintenance
General taxes
Depreciation and amortization

Total operating expenses

Income from operations

Other income and expense - net
Interest expense - net

Income before income taxes
Income tax expense

Net income

Other comprehensive income:

$848,796
458,622
20,741

$812,106
424,534
19,991

$1,012,711
611,168
24,656

369,433

367,581

376,887

125,303
29,281
70,004

120,980
23,872
65,124

224,588

209,976

144,845

157,605

4,523
42,088

107,280
43,382

7,102
42,578

122,129
49,462

63,898

72,667

127,104
28,253
62,814

218,171

158,716

3,714
40,637

121,793
46,671

75,122

Change in employee benefit plan liability, net of taxes of $1,161 for

2011, $674 for 2010 and $1,273 for 2009

(1,779)

(1,027)

(1,936)

Amortization of non-qualified employee benefit plan liability, net of

taxes of ($383) for 2011, ($257) for 2010 and ($58) for 2009

583

391

354

Comprehensive income

Average common shares outstanding:

Basic
Diluted

Earnings per share of common stock:

Basic
Diluted

Dividends declared per share of common stock

$ 62,702

$ 72,031

$

73,540

26,687
26,744

26,589
26,657

26,511
26,576

$
$
$

2.39
2.39
1.75

$
$
$

2.73
2.73
1.68

$
$
$

2.83
2.83
1.60

See Notes to Consolidated Financial Statements

85

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED BALANCE SHEETS

Thousands (December 31)

Assets:
Current assets:

Cash and cash equivalents
Restricted cash
Accounts receivable
Accrued unbilled revenue
Allowance for uncollectible accounts
Regulatory assets
Derivative instruments
Inventories
Gas reserves
Income taxes receivable
Other current assets

Total current assets

Non-current assets:

Property, plant and equipment
Less accumulated depreciation

Total property, plant and equipment - net

Gas reserves
Regulatory assets
Derivative instruments
Other investments
Restricted cash
Other non-current assets

Total non-current assets

Total assets

2011

2010

$

$

5,833
-
77,449
61,925
(2,895)
94,673
2,853
74,363
4,463
7,045
22,980

3,457
924
67,969
64,803
(2,950)
52,714
2,245
80,385
-
41,066
19,652

348,689

330,265

2,661,102
767,226

1,893,876
47,451
371,392
-
68,263
4,000
12,903

2,576,402
722,239

1,854,163
-
348,897
628
69,094
-
13,569

2,397,885

2,286,351

$2,746,574

$2,616,616

See Notes to Consolidated Financial Statements

86

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED BALANCE SHEETS

Thousands (December 31)

Capitalization and liabilities:
Capitalization:

Common stock - no par value; authorized 100,000 shares; issued and outstanding

26,756 and 26,668 at December 31, 2011 and 2010, respectively

Retained earnings
Accumulated other comprehensive loss

Total common stock equity

Long-term debt

Total capitalization

Current liabilities:
Short-term debt
Current maturities of long-term debt
Accounts payable
Taxes accrued
Interest accrued
Regulatory liabilities
Derivative instruments
Other current liabilities

Total current liabilities

Deferred credits and other non-current liabilities:

Deferred tax liabilities
Regulatory liabilities
Pension and other postretirement benefit liabilities
Derivative instruments
Other non-current liabilities

Total deferred credits and other non-current liabilities

Commitments and contingencies (see Note 15)

Total capitalization and liabilities

2011

2010

$ 348,383
373,905
(7,800)

$ 342,978
356,727
(6,604)

714,488
641,700

693,101
591,700

1,356,188

1,284,801

141,600
40,000
86,300
10,747
5,857
31,046
57,317
41,597

414,464

413,209
278,382
201,530
6,536
76,265

975,922

-

257,435
10,000
93,243
10,579
5,182
17,828
38,437
35,457

468,161

373,409
258,031
144,250
17,022
70,942

863,654

-

$2,746,574

$2,616,616

See Notes to Consolidated Financial Statements

87

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

Thousands

Balance at Dec. 31, 2008
Comprehensive income
Restricted stock amortizations
Dividends paid on common stock
Tax benefits from employee stock option plan
Stock-based compensation
Issuance of common stock

Balance at Dec. 31, 2009
Comprehensive income
Dividends paid on common stock
Tax expense from employee stock option plan
Stock-based compensation
Issuance of common stock

Balance at Dec. 31, 2010
Comprehensive income
Dividends paid on common stock
Tax expense from employee stock option plan
Stock-based compensation
Issuance of common stock
Common stock expense

Common
Stock

Retained
Earnings

$336,754
-
39
-
229
(776)
1,115

$296,005
75,122
-
(42,415)
-
-
-

337,361
-
-
(125)
554
5,188

342,978
-
-
(26)
1,769
3,632
30

328,712
72,667
(44,652)
-
-
-

356,727
63,898
(46,690)
-
-
-
(30)

Accumulated
Other
Comprehensive
Income (Loss)

$(4,386)
(1,582)
-
-
-
-
-

(5,968)
(636)
-
-
-
-

(6,604)
(1,196)
-
-
-
-
-

Total
Equity

$628,373
73,540
39
(42,415)
229
(776)
1,115

660,105
72,031
(44,652)
(125)
554
5,188

693,101
62,702
(46,690)
(26)
1,769
3,632
-

Balance at Dec. 31, 2011

$348,383

$373,905

$(7,800)

$714,488

See Notes to Consolidated Financial Statements

88

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS

Thousands (year ended December 31)

2011

2010

2009

Operating activities:

Net income
Adjustments to reconcile net income to cash provided by operations:

Depreciation and amortization
Undistributed earnings from equity investments
Non-cash expenses related to qualified defined benefit pension plans
Contributions to qualified defined benefit pension plans
Deferred environmental expenditures, net of recoveries
Settlement of interest rate hedge
Other
Changes in assets and liabilities:

Receivables
Inventories
Taxes accrued
Accounts payable
Interest accrued
Deferred gas costs
Deferred tax liabilities
Other - net

$ 63,898

$ 72,667

$ 75,122

70,004
1,329
7,191
(22,045)
25,586
-
(1,049)

(6,246)
6,022
34,189
148
675
8,565
46,877
(1,682)

65,124
(588)
8,009
(10,000)
(7,826)
-
(2,265)

15,830
572
(51,524)
(11,846)
(253)
(26,090)
76,410
(1,751)

62,814
(1,329)
9,914
(25,000)
(10,069)
(10,096)
(3,461)

35,506
15,110
23,461
1,188
8,582
36,819
36,775
(15,001)

Cash provided by operating activities

233,462

126,469

240,335

Investing activities:

Capital expenditures
Utility gas reserves
Restricted cash
Other

Cash used in investing activities

Financing activities:

Common stock issued - net
Long-term debt issued
Long-term debt retired
Change in short-term debt
Cash dividend payments on common stock
Other

Cash provided by (used in) financing activities

Increase (decrease) in cash and cash equivalents
Cash and cash equivalents - beginning of period

Cash and cash equivalents - end of period

Supplemental disclosure of cash flow information:

Interest paid
Income taxes paid

(100,534)
(50,597)
(3,076)
1,142

(248,505)
-
34,619
1,015

(135,124)
-
(30,524)
3,507

(153,065)

(212,871)

(162,141)

3,040
90,000
(10,000)
(115,835)
(46,690)
1,464

4,598
-
(35,000)
155,435
(44,652)
1,046

(375)
125,000
(300)
(158,851)
(42,415)
263

(78,021)

81,427

(76,678)

2,376
3,457

(4,975)
8,432

1,516
6,916

$

5,833

$

3,457

$

8,432

$ 41,413
1,756
$

$ 41,037
$ 22,600

$ 36,762
$ 10,000

See Notes to Consolidated Financial Statements

89

NORTHWEST NATURAL GAS COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.

Organization and Principles of Consolidation

The accompanying consolidated financial statements represent the consolidation of Northwest

Natural Gas Company (NW Natural) and all companies that we directly or indirectly control, either
through majority ownership or otherwise. Our direct and indirect wholly-owned subsidiaries include
Gill Ranch Storage, LLC (Gill Ranch), NW Natural Energy, LLC (NWN Energy), NW Natural Gas
Storage, LLC (NWN Gas Storage), and NNG Financial Corporation (NNG Financial). Investments in
corporate joint ventures and partnerships that we do not directly or indirectly control, and for which we
are not the primary beneficiary, are accounted for under the equity method or the cost method, which
includes NWN Energy’s investment in Palomar Gas Holdings, LLC (PGH). NW Natural and its
affiliated companies are collectively referred to herein as “NW Natural.” The consolidated financial
statements are presented after elimination of all significant intercompany balances and transactions,
except for amounts required to be included under regulatory accounting standards to reflect the effect
of such regulation. In this report, the term “utility” is used to describe our regulated gas distribution
business, and the term “non-utility” is used to describe our gas storage business and other non-utility
investments and business activities.

Certain prior year balances in our consolidated financial statements have been combined to

conform with the current presentation. These changes had no impact on our prior year’s consolidated
results of operations, financial condition or cash flows.

2.

Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting

principles in the United States of America (U.S. GAAP) requires management to make estimates and
assumptions that affect reported amounts in the consolidated financial statements and accompanying
notes. Actual amounts could differ from those estimates, and changes would most likely be reported in
future periods. Management believes that the estimates and assumptions used are reasonable.

Industry Regulation

Our principal businesses are the distribution of natural gas, which is regulated by the Public

Utility Commission of Oregon (OPUC) and Washington Utilities and Transportation Commission
(WUTC), and natural gas storage services, which are regulated by either the Federal Energy
Regulatory Commission (FERC) or the California Public Utilities Commission (CPUC), and to a
certain extent by the OPUC. Accounting records and practices of our regulated businesses conform to
the requirements and uniform system of accounts prescribed by these regulatory authorities in
accordance with U.S. GAAP. Our businesses regulated by the OPUC, WUTC and FERC earn a
reasonable return on invested capital from approved cost-based rates, while our business regulated by
the CPUC earns a return to the extent we are able to charge competitive prices above our costs (i.e.
market-based rates).

In applying regulatory accounting principles, we capitalize or defer certain costs and revenues

as regulatory assets and liabilities pursuant to orders of the OPUC or WUTC, which provides for the
recovery of revenues or expenses from, or refunds to, utility customers in future periods, including a
return or a carrying charge in most cases.

90

At December 31, 2011 and 2010, the amounts deferred as regulatory assets and liabilities were

as follows:

Thousands
Current:

Unrealized loss on derivatives (1)
Pension and other postretirement benefit liabilities (2)
Other (3)

Total current

Non-current:

Unrealized loss on derivatives (1)
Income tax asset
Pension and other postretirement benefit liabilities(2)
Environmental costs (4)
Other (3)

Total non-current

Thousands
Current:

Gas costs
Unrealized gain on derivatives (1)
Other (3)

Total current

Non-current:
Gas costs
Unrealized gain on derivatives (1)
Accrued asset removal costs
Other (3)

Total non-current

Regulatory Assets
2010
2011

$ 57,317
15,491
21,865

$ 38,437
10,988
3,289

$ 94,673

$ 52,714

$

6,536
65,264
170,512
105,670
23,410

$ 17,022
72,341
118,248
114,311
26,975

$371,392

$348,897

Regulatory Liabilities

2011

2010

$ 17,994
2,853
10,199

$ 15,583
2,245
-

$ 31,046

$ 17,828

$

8,420
-
267,355
2,607

$

2,297
628
252,941
2,165

$278,382

$258,031

(1) An unrealized gain or loss on derivatives does not earn a rate of return or a carrying charge. These amounts are

recoverable through utility rates as part of the annual Purchased Gas Adjustment mechanism when realized at settlement.

(2) Certain pension and other postretirement benefit liabilities of the utility are approved for regulatory deferral, including

amounts recorded to the pension cost balancing account to defer the effects of higher and lower pension expenses. Such
amounts include an interest component when recognized in net periodic benefit costs or earn a rate of return or carrying
charge (see Note 9).

(3) Other primarily consists of deferrals and amortizations under other approved regulatory mechanisms. The accounts being

(4)

amortized typically earn a rate of return or carrying charge.
Environmental costs are related to those sites that are approved for regulatory deferral. In Oregon, we earn a rate of
return on amounts paid, whereas amounts accrued but not yet paid do not earn a rate of return or a carrying charge until
expended. Environmental costs related to Washington were deferred beginning in 2011, with cost recovery and carrying
charge to be determined in a future proceeding.

91

The amortization period for our regulatory assets and liabilities ranges from less than one year

to an undeterminable period. Our regulatory deferrals for gas costs payable are generally amortized
over 12 months beginning each November 1 following the gas contract year during which the deferred
gas costs are realized. Similarly, most of our regulatory deferred accounts are amortized over 12
months. However, certain regulatory account balances, such as income taxes, environmental costs,
pension liabilities and accrued asset removal costs, are large and tend to be amortized over longer
periods once we have agreed upon an amortization period with the respective regulatory agency.

We believe that continued application of regulatory accounting for these activities is
appropriate and consistent with the current regulatory environment, and that all regulated assets and
liabilities at December 31, 2011 and 2010 will be recoverable or refundable through future rate making
decisions. We annually review all regulatory assets and liabilities for recoverability and more often if
circumstances warrant. If we should determine that all or a portion of these regulatory assets or
liabilities no longer meet the criteria for continued application of regulatory accounting, then we would
be required to write off the net unrecoverable balances against earnings.

New Accounting Standards

Adopted Standards

Fair Value Disclosures. In January 2011, the Financial Accounting Standards Board (FASB)
issued authoritative guidance on new fair value measurements and disclosures. This guidance requires
additional disclosures for fair value measurements that use significant assumptions not observable in
active markets (i.e. level 3 valuations), including a roll-forward schedule. These changes were effective
for periods beginning after December 15, 2010; however, we elected to early adopt these disclosure
requirements, as shown in Note 9. The adoption of this standard did not have a material effect on our
financial statement disclosures.

Comprehensive Income. In June 2011, the FASB issued authoritative guidance on the

presentation of comprehensive income within the financial statements. An entity can elect to present
items of net income and other comprehensive income in one continuous statement—referred to as the
statement of comprehensive income—or in two separate, but consecutive, statements. These changes
are effective for periods beginning after December 15, 2011. We have elected to early adopt this
standard and present net income and other comprehensive income in one continuous statement.

Multiemployer Pension Plans. In September 2011, the FASB issued authoritative guidance
regarding multiemployer pension plan disclosures. The revised standard is intended to provide more
information about an employer’s financial obligations to a multiemployer pension plan and, therefore,
help financial statement users better understand the financial health of all significant plans in which the
employer participates. This standard has been adopted as shown in Note 9.

Recent Accounting Pronouncements

Fair Value Measurement. In May 2011, the FASB issued amendments to the authoritative

guidance on fair value measurement. The amendments are primarily related to disclosure requirements,
which go into effect for periods beginning after December 15, 2011. Early implementation is not
allowed, and we are currently assessing the impact on our financial statement disclosures.

92

Balance Sheet Offsetting. In December 2011, the FASB issued authoritative guidance
regarding the offsetting of assets and liabilities on the balance sheet. The revised standard is intended
to provide more comparable guidance between the U.S. GAAP and international accounting standards
by requiring entities to disclose both gross and net amounts for assets and liabilities offset on the
balance sheet as well as other disclosures concerning their enforceable master netting arrangements.
This guidance is effective for annual reporting periods beginning after January 1, 2013 and we are
currently assessing the impact on our financial statement disclosures.

Plant, Property and Accrued Asset Removal Costs

Plant and property are stated at cost, including capitalized labor, materials and overhead (see
Note 11). In accordance with regulatory accounting standards, the cost of acquiring and constructing
long-lived plant and property generally includes an allowance for funds used during construction
(AFUDC) or capitalized interest. AFUDC represents the regulatory financing cost incurred when debt
and equity funds are used for construction (see “Allowance for Funds Used During Construction,”
below). When constructed assets are subject to market-based rates rather than cost-based rates, then the
financing cost incurred during construction are included in capitalized interest in accordance with U.S.
GAAP, not regulatory financing cost under AFUDC.

In accordance with long-standing regulatory treatment, our depreciation rates are comprised of

three components: one based on the average service life of the asset, a second based on the estimated
salvage value of the asset, and a third based on the asset’s cost of removal. We collect, through rates,
the estimated cost of removal on certain regulated properties through depreciation expense, with a
corresponding offset to accumulated depreciation. These removal costs are non-legal obligations as
defined by regulatory accounting guidance. Therefore, we have included these costs in non-current
regulatory liabilities on our consolidated balance sheets. In the rate setting process, the liability for the
removal costs is treated as a reduction to the net rate base upon which the regulated utility has the
opportunity to earn its allowed rate of return.

Our provision for depreciation of utility plant and property is computed under the straight-line

method in accordance with engineering studies approved by regulatory authorities. The weighted
average depreciation rate for utility assets in service was approximately 2.8 percent in 2011 and 2010,
and 2.9 percent in 2009 reflecting the approximate average economic life of the property. This includes
2011 weighted average depreciation rates for the following asset categories: 2.7 percent for
transmission and distribution plant, 2.2 percent for gas storage facilities, 4.6 percent for general plant,
and 5.1 percent for intangible and other fixed assets.

Allowance for Funds Used During Construction

Certain additions to utility plant include AFUDC, which represents the net cost of debt and
equity funds used during construction. AFUDC is calculated using actual interest rates for debt and
authorized rates for return on equity, if applicable. If short-term debt balances are less than the total
balance of construction work in progress, then a composite AFUDC rate is used to represent interest on
all debt funds, shown as a reduction to interest charges, and a return on equity funds, shown as other
income. While cash is not immediately recognized from recording AFUDC, it is realized in future
years through rate recovery resulting from the higher utility cost of service. Our composite AFUDC
rates were 0.5 percent in 2011, 0.6 percent in 2010 and 1.0 percent in 2009.

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Cash and Cash Equivalents

For purposes of reporting cash flows, cash and cash equivalents include cash on hand plus

highly liquid investment accounts with maturity dates of three months or less. At December 31, 2011,
outstanding checks of approximately $3.9 million were included in accounts payable.

Revenue Recognition and Accrued Unbilled Revenues

Utility revenues, derived primarily from the sale and transportation of natural gas, are
recognized upon delivery of gas commodity or service to customers. Revenues include accruals for gas
delivered but not yet billed to customers based on estimates of deliveries from meter reading dates to
month end (accrued unbilled revenues). Accrued unbilled revenues are dependent upon a number of
factors that require management’s judgment, including total gas receipts and deliveries, customer use
by billing cycle and weather factors. Accrued unbilled revenues are reversed the following month
when actual billings occur. Our accrued unbilled revenues at December 31, 2011 and 2010 were $61.9
million and $64.8 million, respectively.

From 2007 through 2010, utility net operating revenues also included the recognition of a

regulatory adjustment for income taxes paid pursuant to a legislative rule (commonly referred to as SB
408) in effect for certain gas and electric utilities in Oregon. Under SB 408, we were required to
automatically implement a rate refund, or a rate surcharge, to utility customers on an annual basis. The
refund or surcharge amount was based on the difference between income taxes paid and income taxes
authorized to be collected in customer rates. We recorded the refund, or surcharge, each quarter based
on estimates of the annual amount to be recognized. On May 24, 2011, SB 408 was repealed and
replaced by Senate Bill 967. SB 967 required utilities to eliminate amounts accrued under SB 408 for
the 2010 and 2011 tax years, thereby denying recovery by NW Natural of the surcharge accrued for
2010, which resulted in a one-time pre-tax charge of $7.4 million in the second quarter of 2011.
Pursuant to SB 967, we changed our revenue recognition policy effective January 1, 2011 and no
longer recognize a regulatory adjustment for income taxes for SB 408.

Non-utility revenues are derived primarily from the gas storage business segment. At Mist,

revenues are recognized upon delivery of services to customers. Revenues from our asset management
partner are recognized over the life of the asset management contract for guaranteed amounts, if any,
and are recognized as earned for amounts above the guaranteed amount. At Gill Ranch, firm storage
services resulting from short-term and long-term contracts are typically recognized in revenue ratably
over the term of the contract regardless of the actual storage capacity utilized. Asset management
revenue is recognized using a straight-line, pro rata methodology over the term of each contract and
provides us with 80 percent of the pre-tax income from our independent energy marketing company.
See Note 4.

Accounts Receivable and Allowance for Uncollectible Accounts

Accounts receivable consist primarily of amounts due for natural gas sales and transportation

services to core utility customers, plus amounts due for gas storage services. With respect to these
trade receivables, including accrued unbilled revenues, we establish an allowance for uncollectible
accounts (allowance) based on the aging of receivables, collection experience of past due account
balances including payment plans, and historical trends of write-offs as a percent of revenues. With
respect to large individual customer receivables, a specific allowance is established and added to the
general allowance when amounts are identified as unlikely to be partially or fully recovered. Inactive
accounts are written-off against the allowance after they are 120 days past due or when deemed to be

94

uncollectible. Differences between our estimated allowance and actual write-offs will occur based on a
number of factors, including changes in economic conditions, customer credit worthiness and the level
of natural gas prices. Each quarter the allowance for uncollectible accounts is adjusted, as necessary,
based on information currently available.

Inventories

Utility gas inventories, which consist of natural gas in storage for the utility, are generally

stated at the lower of average cost or net realizable value. The regulatory treatment of utility gas
inventories provides for cost recovery in customer rates. Utility gas inventories that are injected into
storage are priced into inventory based on actual purchase costs. Utility gas inventories that are
withdrawn from storage are charged to cost of gas during the current period at the weighted average
inventory cost.

Gas Storage inventories, which primarily represent inventories at Gill Ranch, exclude cushion

gas and consist of natural gas that we received as fuel-in-kind from storage customers. Gas Storage
inventories are valued at the lower of average cost or net realizable value. Cushion gas is recorded at
original cost and classified as long-term assets.

Material and supplies inventories, which consist of both utility and non-utility inventories, are

stated at the lower of average cost or net realizable value.

Our utility and gas storage inventories totaled $65.6 million and $70.7 million at December 31,

2011 and 2010, respectively, and our materials and supplies inventories totaled $8.8 million and $9.7
million at December 31, 2011 and 2010, respectively.

Gas Reserves

Our gas reserves are stated at cost, adjusted for regulatory amortization, with the associated
deferred tax benefits recorded as liabilities on the balance sheet. Transactional costs to enter into the
agreement (see Note 12) and payments by NW Natural to Encana Oil & Gas (USA) Inc. (Encana) are
recognized as gas reserves on the balance sheet. The current portion is calculated based on expected
gas deliveries within the next fiscal year. We recognize regulatory amortization of this asset on a
volumetric basis and calculate using the proven reserves and the therms extracted and sold each
month. The amortization of gas reserves is recorded as an adjustment to the cost of gas.

Derivatives

In accordance with accounting for derivatives and hedges, we measure derivatives at fair value

and recognize them as either assets or liabilities on the balance sheet. Accounting for derivatives
requires that changes in the fair value be recognized currently in earnings unless specific hedge
accounting criteria are met. Accounting for derivatives and hedges provides an exception for contracts
intended for normal purchases and normal sales for which physical delivery is probable. In addition,
certain derivative contracts are approved by regulatory authorities for recovery or refund through
customer rates. Accordingly, the changes in fair value of these approved contracts are deferred as
regulatory assets or liabilities pursuant to regulatory accounting principles. Derivative contracts entered

95

into for core utility customer requirements after the annual purchased gas adjustment (PGA) rate has
been set are subject to the PGA incentive sharing mechanism. Effective November 1, 2008, Oregon
approved a PGA sharing mechanism under which we are required to select either an 80 percent deferral
or 90 percent deferral of higher or lower gas costs such that the impact on current earnings from the
gas cost sharing is either 20 percent or 10 percent of gas cost differences compared to PGA prices,
respectively. For the PGA years in Oregon beginning November 1, 2011, 2010 and 2009, we selected a
90 percent deferral of gas cost differences. In Washington, 100 percent of our gas cost differences are
deferred. See Note 13.

Our financial derivatives policy sets forth the guidelines for using selected derivative products

to support prudent risk management strategies within designated parameters. Our objective for using
derivatives is to decrease the volatility of gas prices, earnings and cash flows and to prevent
speculative risk. The use of derivatives is permitted only after the risk exposures have been identified,
are determined to exceed acceptable tolerance levels and are necessary to support normal business
activities. We do not enter into derivative instruments for trading purposes and we believe that any
increase in market risk created by holding derivatives should be offset by the exposures they modify.

Fair Value

In accordance with fair value accounting, we use the following fair value hierarchy for

determining inputs for our debt, pension plan assets and our derivative fair value measurements:

• Level 1: Valuation is based upon quoted prices for identical instruments traded in active

markets;

• Level 2: Valuation is based upon quoted prices for similar instruments in active markets,

quoted prices for identical or similar instruments in markets that are not active, and model-
based valuation techniques for which all significant assumptions are observable in the
market; and

• Level 3: Valuation is generated from model-based techniques that use significant

assumptions not observable in the market. These unobservable assumptions reflect our own
estimates of assumptions that market participants would use in valuing the asset or liability.

When developing fair value measurements, it is our policy to use quoted market prices
whenever available, or to maximize the use of observable inputs and minimize the use of unobservable
inputs when quoted market prices are not available. Fair values are primarily developed using industry-
standard models that consider various inputs including: (a) quoted future prices for commodities;
(b) forward currency prices; (c) time value; (d) volatility factors; (e) current market and contractual
prices for underlying instruments; (f) market interest rates and yield curves; (g) credit spreads; (h) and
other relevant economic measures.

Revenue Taxes

We account for revenue-based taxes as a separate cost item collected from customers.

Therefore, revenue taxes are accounted for as a cost of sale and presented separately on the income
statement.

Income Tax Expense

NW Natural and its wholly-owned subsidiaries file consolidated federal and state income tax

returns. Current income taxes are allocated based on each entity’s respective taxable income or loss

96

and tax credits as if each entity filed a separate return. We account for income taxes in accordance with
accounting standards for income taxes. Accounting for income taxes requires recognition of deferred
tax liabilities and assets for the future tax consequences of events that have been included in the
consolidated financial statements or tax returns. Under this method, deferred tax liabilities and assets
are determined based on the difference between the financial statement and tax basis of assets and
liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse
(see Note 10).

Accounting for income taxes also requires recognition of deferred income tax assets and
liabilities for temporary differences where regulators prohibit deferred income tax treatment for
ratemaking purposes. We have recorded a deferred tax liability equivalent of $68.5 million and $72.3
million at December 31, 2011 and 2010, respectively, to recognize future taxes payable resulting from
transactions that have previously been reflected in the financial statements for these temporary
differences. Regulatory assets or liabilities corresponding to such additional deferred income tax assets
or liabilities may be recorded to the extent we believe they will be recoverable from or payable to
customers through the ratemaking process. Pursuant to regulatory accounting principles, a
corresponding regulatory asset has been recorded which represents the probable future revenue that
will result from inclusion in rates charged to customers of taxes which will be paid in the future. The
probable future revenue to be recorded takes into consideration the additional future taxes which will
be generated by that revenue. Amounts applicable to income taxes due from customers primarily
represent differences between the book and tax basis of net utility plant in service and actual removal
costs incurred.

Deferred investment tax credits on utility plant additions, which reduce income taxes payable,

are deferred for financial statement purposes and amortized over the life of the related plant or lease.

Subsequent Events

We monitor significant events occurring after the balance sheet date and prior to the issuance
of the financial statements to determine the impacts, if any, of events on the financial statements to be
issued. We do not have any subsequent events to report.

97

3.

Earnings Per Share

Basic earnings per share are computed using net income and the weighted average number of
common shares outstanding for each period presented. Diluted earnings per share are computed in the
same manner, except it uses the weighted average number of common shares outstanding plus the
effects of the assumed exercise of stock options and the payment of estimated stock awards from other
stock-based compensation plans that are outstanding at the end of each period presented. Diluted
earnings per share are calculated as follows:

Thousands, except per share amounts

Net income

Average common shares outstanding—basic

Additional shares for stock-based compensation plans

Average common shares outstanding—diluted

Earnings per share of common stock—basic

Earnings per share of common stock—diluted

Additional information:

Antidilutive shares not included in net income per diluted

2011

2010

2009

$63,898

$72,667

$75,122

26,687
57

26,744

26,589
68

26,657

26,511
65

26,576

$

$

2.39

2.39

$

$

2.73

2.73

$

$

2.83

2.83

common share calculation

2,101

743

2,142

4.

Segment Information

We operate in two primary reportable business segments, local gas distribution and gas
storage. We also have other investments and business activities not specifically related to one of these
two reporting segments, which we aggregate and report as “other.” We refer to our local gas
distribution business as the “utility,” and our “gas storage” and “other” business segments as “non-
utility.” Our gas storage segment includes NWN Gas Storage, which is a wholly-owned subsidiary of
NWN Energy, Gill Ranch, which is a wholly-owned subsidiary of NWN Gas Storage, the non-utility
portion of our Mist underground storage facility in Oregon (Mist) and third-party asset management
services. Our “other” segment includes NNG Financial and our equity investment in PGH, which is
pursuing development of the Palomar pipeline project (see Other, below).

Local Gas Distribution

Our local gas distribution segment is a regulated utility principally engaged in the purchase, sale
and delivery of natural gas and related services to customers in Oregon and southwest Washington. As a
regulated utility, we are responsible for building and maintaining a safe and reliable pipeline distribution
system, purchasing sufficient gas supplies from producers and marketers, contracting for firm and
interruptible transportation of gas over interstate pipelines to bring gas from the supply basins into our
service territory, and re-selling the gas to customers subject to rates, terms and conditions approved by
the OPUC or WUTC. Gas distribution also includes taking customer-owned gas and transporting it from
interstate pipeline connections, or city gates, to the customers’ end-use facilities for a fee, which is
approved by the OPUC or WUTC. Approximately 90 percent of our customers are located in Oregon and
10 percent in Washington. On an annual basis, residential and commercial customers typically account
for 50 to 60 percent of our utility’s total volumes delivered and 80 to 90 percent of our utility’s margin.
Industrial customers account for the remaining 40 to 50 percent of volumes and 5 to 15 percent of
margin. The remaining 10 percent or less of margin is derived from miscellaneous services, gains or
losses from an incentive gas cost sharing mechanism and other fees.

98

Industrial customers we serve include: pulp, paper and other forest products; the manufacture

of electronic, electrochemical and electrometallurgical products; the processing of farm and food
products; the production of various mineral products; metal fabrication and casting; the production of
machine tools, machinery and textiles; the manufacture of asphalt, concrete and rubber; printing and
publishing; nurseries; government and educational institutions; and electric generation. No individual
customer or industry group accounts for a significant portion of our utility revenues or margins.

Gas Storage

Our gas storage business segment includes natural gas storage services provided to customers

primarily from two underground natural gas storage facilities, our Gill Ranch gas storage facility,
which commenced commercial operations in October 2010, and the non-utility portion of our Mist gas
storage facility. In addition to earning revenue from customer storage contracts, we also use an
independent energy marketing company to provide asset management services for utility and
non-utility capacity under contractual arrangement, the results of which are included in this business
segment. For the years ended December 31, 2011, 2010 and 2009, this business segment derived a
majority of its revenues from asset management services and from firm and interruptible gas storage
contracts.

Mist Gas Storage Facility. Earnings from non-utility assets at the Mist facility are primarily

related to firm storage capacity revenues. Earnings for the gas storage segment include revenues, net of
amounts shared with core utility customers, from management of utility assets at Mist and upstream
capacity when not needed to serve core utility customers. In Oregon, the gas storage segment retains
80 percent of the pre-tax income from these services when the costs of the capacity have not been
included in utility rates, or 33 percent of the pre-tax income when the costs have been included in
utility rates. The remaining 20 percent and 67 percent, respectively, are credited to a deferred
regulatory account for crediting back to core utility customers. We have a similar sharing mechanism
in Washington for revenue derived from storage and third party asset management services.

Gill Ranch Gas Storage Facility. Gill Ranch has a joint project agreement with Pacific

Gas and Electric Company (PG&E) to own the Gill Ranch underground natural gas storage facility
near Fresno, California. Gill Ranch has a 75 percent undivided ownership interest in the facility, which
offers storage services to the California market at market-based rates, subject to CPUC regulation
including, but not limited to, service terms and conditions and tariff regulations.

Other

We have non-utility investments and other business activities which are aggregated and
reported as a business segment called “other.” Although in the aggregate these investments and
activities are currently not material to consolidated operations, we identify and report them as a stand-
alone segment based on our organizational structure and decision-making process because these
business investments and activities are not specifically related to our utility or gas storage
segments. This segment primarily consists of an equity method investment in a joint venture to build
and operate an interstate gas transmission pipeline in Oregon (Palomar) and other pipeline assets in
NNG Financial. For more on information on Palomar, see Note 12. This segment also includes some
operating and non-operating revenues and expenses of the parent company that cannot be allocated to
utility operations.

99

NNG Financial holds certain non-utility financial investments, but its assets primarily consist

of an active, wholly-owned subsidiary which owns a 10 percent interest in an 18-mile interstate natural
gas pipeline. NNG Financial’s total assets were $1.1 million at both December 31, 2011 and 2010.

Segment Information Summary

The following table presents summary financial information about the reportable segments for

the years ended 2011, 2010 and 2009. Inter-segment transactions are insignificant.

Thousands
2011
Net operating revenues
Depreciation and amortization
Income from operations
Net income
Total assets at December 31, 2011

2010
Net operating revenues
Depreciation and amortization
Income from operations
Net income
Total assets at December 31, 2010

2009
Net operating revenues
Depreciation and amortization
Income from operations
Net income

Utility

Gas Storage

Other

Total

$ 342,970
63,843
135,722
60,527
2,435,888

$ 346,148
62,661
145,688
66,262
2,310,388

$ 357,005
61,472
142,228
65,960

$ 26,354
6,161
9,090
4,101
294,637

$ 21,249
2,463
11,855
6,110
282,945

$ 19,738
1,342
16,442
8,923

$

109
-
33
(730)
16,049

$ 369,433
70,004
144,845
63,898
2,746,574

$

184
-
62
295
23,283

$ 367,581
65,124
157,605
72,667
2,616,616

$

144
-
46
239

$ 376,887
62,814
158,716
75,122

5.

Common Stock

Common Stock

As of December 31, 2011 and 2010, our common shares authorized were 100,000,000. As of

December 31, 2011, we had reserved for issuances 155,955 shares of common stock under the
Employee Stock Purchase Plan (ESPP), 293,246 shares under our Dividend Reinvestment and Direct
Stock Purchase Plan and 1,159,875 shares under our Restated Stock Option Plan (Restated SOP).

Stock Repurchase Program

We have a share repurchase program for our common stock under which we purchase shares

on the open market or through privately negotiated transactions. We currently have Board
authorization through May 2012 to repurchase up to an aggregate of 2.8 million shares, or up to $100
million. No shares of common stock were repurchased pursuant to this program in 2011, 2010 or
2009. Since inception in 2000, a total of 2.1 million shares have been repurchased at a total cost of
$83.3 million.

100

Summary of Changes in Common Stock

The following table shows the changes in the number of shares of our common stock issued

and outstanding for the years 2011, 2010 and 2009:

Thousands

Balance, December 31, 2008

Sales to employees under ESPP
Exercise of stock options under Restated SOP—net

Balance, December 31, 2009

Sales to employees under ESPP
Exercise of stock options under Restated SOP—net

Balance, December 31, 2010

Sales to employees under ESPP
Exercise of stock options under Restated SOP—net
Sales to shareholders under DRPP

Balance, December 31, 2011

Shares

26,501
9
23

26,533
24
111

26,668
15
24
49

26,756

6.

Stock-Based Compensation

We have several stock-based compensation plans, including the Long-Term Incentive Plan

(LTIP), the Restated SOP and the ESPP. These plans are designed to promote stock ownership in NW
Natural by employees and officers.

Long-Term Incentive Plan

The LTIP is intended to provide a flexible, competitive compensation program for eligible
officers and key employees. An aggregate of 600,000 shares of common stock was authorized for
grants under the LTIP as stock bonus, restricted stock or performance-based stock awards. Shares
awarded under the LTIP may be purchased on the open market or issued as new shares.

At December 31, 2011, 337,788 shares of common stock were available for award under the

LTIP, assuming that performance based grants currently outstanding are awarded at the target
level. The LTIP stock awards are compensatory awards for which compensation expense is based on
the fair value of stock awards, with expense being recognized over the performance and vesting period
for the outstanding awards.

Performance-based Stock Awards. Since the LTIP’s inception in 2001, performance-based
stock awards have been granted annually based on three-year performance periods. At December 31,
2011, certain performance-based stock award measures had been achieved for the 2009-11 award
period. Accordingly, participants are estimated to receive 8,428 shares of common stock and a
dividend equivalent cash payment equal to the number of shares of common stock received on the
award payout multiplied by the aggregate cash dividends paid per share during the performance period.
At December 31, 2010 and 2009, we awarded 8,007 and 15,900 shares of common stock, respectively,
for the 2008-10 and 2007-09 award periods, plus a dividend equivalent cash payment equal to the
number of shares of common stock received on the award payout multiplied by the aggregate cash
dividends paid per share during the performance period. In 2010 and 2009, we expensed $0.2 million
and $0.5 million respectively for both the 2008-10 and 2007-09 performance-based stock award
periods, and on a cumulative basis we accrued a total of $0.7 million and $1.5 million, respectively,
related to the 2008-10 and 2007-09 performance periods.

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At December 31, 2011, the aggregate number of performance-based shares granted and

outstanding at the threshold, target and maximum levels were as follows:

Performance
Period

2009-11
2010-12
2011-13

Total

Performance Share Awards Outstanding

Threshold

Target

Maximum

2011
Expense

Cumulative Expense
At Dec. 31, 2011

7,410

n/a (1)
n/a (1)

39,000
41,500
37,950

78,000
83,000
75,900

118,450

236,900

$ 353
430
276

$1,059

$763
718
$276

(1)

The threshold requirement was modified and is no longer applicable beginning in the 2010-12 performance
period.

The threshold level estimates future payout assuming the minimum award payable is achieved
for each component of the formula in the LTIP. For each of these performance periods, awards will be
based on total shareholder return relative to a peer group of gas distribution companies over the three-
year performance period and on performance results achieved relative to specific core and non-core
strategies. Compensation expense is recognized in accordance with the accounting standard for stock
compensation based on performance levels achieved and an estimated fair value using a Black-Scholes
or binomial model. The weighted-average grant date fair value of unvested shares at December 31,
2011 and 2010 was $25.06 and $23.10 per share, respectively. The weighted-average grant date fair
value of shares vested during the year was $22.35 per share and granted during the year was $19.38 per
share.

Restricted Stock Units. A new form of restricted stock awards was approved by the Board in

2011. Restricted Stock Units (RSUs) are expected to be used instead of the Restated SOP starting in
February of 2012. The LTIP plan was amended to allow RSUs to be granted under the plan. RSUs are
expected to include a performance based threshold and a vesting period of four years from the grant
date. An RSU obligates the Company upon vesting to issue the RSU holder one share of common
stock plus a cash payment equal to the total amount of dividends paid per share between the grant date
and vesting date of the RSU.

Restated Stock Option Plan

A total of 2,400,000 shares of common stock were reserved for issuance under the Restated

SOP with 580,650 available for grant as of December 31, 2011. Options under the Restated SOP may
be granted only to officers and key employees designated by a committee of our Board of
Directors. All options are granted at an option price equal to the closing market price on the date of
grant and may be exercised for a period up to 10 years and 7 days from the date of grant. Option
holders may exchange shares they have owned for at least six months, at the current market price, to
purchase shares at the option price.

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The fair value of each stock option is estimated on the grant date using the Black-Scholes

option pricing model with the following weighted average assumptions and outcomes:

2011

2010

2009

Risk-free interest rate
Expected life (in years)
Expected market price volatility factor
Expected dividend yield
Forfeiture rate
Weighted average grant date fair value

2.0%
4.5

2.3%
4.7

2.0%
4.7
24.5% 23.2% 22.5%
3.8%
3.8%
3.8%
3.7%
3.2%
3.1%
$ 5.46
$ 6.36
$ 6.73

The expected life of our grants was calculated based on our actual experience with previously

exercised option grants. The risk-free interest rate was based on the implied yield currently available
on U.S. Treasury zero-coupon issues with a life equal to the expected life of the options. Historical data
was used to estimate the volatility factor, measured on a daily basis, for a period equal to the duration
of the expected life of the option awards. The dividend yield was based on management’s current
estimate for future dividend payouts at the time of grant. We expense the total cost of stock option
awards granted to retirement eligible employees at the date of grant in accordance with stock option
accounting guidance and the retirement vesting provisions of our option agreements.

Information regarding the Restated SOP activity for the three years ended December 31, 2011

is summarized as follows:

Balance outstanding, Dec. 31, 2008
Granted
Exercised

Balance outstanding, Dec. 31, 2009
Granted
Exercised
Forfeited

Balance outstanding, Dec. 31, 2010
Granted
Exercised
Forfeited

Balance outstanding, Dec. 31, 2011

Exercisable, Dec. 31, 2011

Option
Shares

396,410
111,750
(23,225)

484,935
119,750
(111,525)
(2,700)

490,460
122,700
(24,185)
(9,750)

579,225

311,951

Weighted -
Average
Price Per Share

Intrinsic
Value
(In millions)

$38.62
41.15
30.92

39.57
44.25
39.01
43.00

40.82
45.74
33.88
44.38

$42.09

$40.20

$2.3
n/a
0.3

2.7
n/a
0.9
n/a

2.8
n/a
0.3
n/a

$3.4

$2.4

In the year ended December 31, 2011, cash of $0.8 million was received for option shares

exercised and a $26,000 thousand related tax benefit was realized. For the 12 months ended
December 31, 2011, 2010 and 2009, the total fair value of options that vested was $0.6 million, $0.5
million and $0.4 million, respectively. The weighted average remaining life of options exercisable and
outstanding at December 31, 2011 was 5.5 years and 6.8 years, respectively. As of December 31, 2011,
there was $1.0 million of unrecognized compensation cost related to the unvested portion of
outstanding stock option awards expected to be recognized over a period extending through 2014.

103

Employee Stock Purchase Plan

The ESPP allows employees to purchase common stock at 85 percent of the closing price on

the trading day immediately preceding the initial offering date, which is set annually. Each eligible
employee may purchase up to $21,210 worth of stock through payroll deductions over a 12-month
period.

In accordance with accounting for stock compensation, stock-based compensation expense is

recognized as operations and maintenance expense or is capitalized as part of construction
overhead. The following table summarizes the financial statement impact of stock-based compensation
under our LTIP, Restated SOP and ESPP:

Thousands

2011

2010

2009

Operations and maintenance expense, for stock-based compensation
Income tax benefit

$1,477
(597)

$1,032
(418)

$1,434
(559)

Net stock-based compensation effect on net income

Amounts capitalized for stock-based compensation

$ 880

$ 614

$ 875

$ 261

$ 182

$ 229

7.

Cost and Fair Value Basis of Long-Term Debt

Cost of Long-Term Debt

The issuance of first mortgage debt, including secured medium-term notes (MTNs), under the
Mortgage and Deed of Trust (Mortgage) is limited by eligible property, adjusted net earnings and other
provisions of the Mortgage. The Mortgage constitutes a first mortgage lien on substantially all of our
utility property. In addition, our Gill Ranch subsidiary senior secured notes are secured by all of the
membership interests in Gill Ranch Storage, LLC as well as Gill Ranch’s debt service reserve account.

104

The maturities on the long-term debt outstanding for each of the 12-month periods through

December 31, 2016 amount to: $40 million in 2012; none in 2013; $60 million in 2014; $40 million in
2015; and $65 million in 2016.

Thousands
Utility Medium-Term Notes:
First Mortgage Bonds:
4.11 % Series B due 2010
7.45 % Series B due 2010
6.665 % Series B due 2011
7.13 % Series B due 2012
8.26 % Series B due 2014
3.95 % Series B due 2014
4.70 % Series B due 2015
5.15 % Series B due 2016
7.00 % Series B due 2017
6.60 % Series B due 2018
8.31 % Series B due 2019
7.63 % Series B due 2019
5.37 % Series B due 2020
9.05 % Series A due 2021
3.176 % Series A due 2021
5.62 % Series B due 2023
7.72 % Series B due 2025
6.52 % Series B due 2025
7.05 % Series B due 2026
7.00 % Series B due 2027
6.65 % Series B due 2027
6.65 % Series B due 2028
7.74 % Series B due 2030
7.85 % Series B due 2030
5.82 % Series B due 2032
5.66 % Series B due 2033
5.25 % Series B due 2035

Subsidiary Senior Secured Notes:
Gill Ranch Notes due 2016 (1)

Less current maturities of long-term debt

Total long-term debt

2011

2010

2009

$

-
-
-
40,000
10,000
50,000
40,000
25,000
40,000
22,000
10,000
20,000
75,000
10,000
50,000
40,000
20,000
10,000
20,000
20,000
19,700
10,000
20,000
10,000
30,000
40,000
10,000

$

-
-
10,000
40,000
10,000
50,000
40,000
25,000
40,000
22,000
10,000
20,000
75,000
10,000
-
40,000
20,000
10,000
20,000
20,000
19,700
10,000
20,000
10,000
30,000
40,000
10,000

$ 10,000
25,000
10,000
40,000
10,000
50,000
40,000
25,000
40,000
22,000
10,000
20,000
75,000
10,000
-
40,000
20,000
10,000
20,000
20,000
19,700
10,000
20,000
10,000
30,000
40,000
10,000

641,700

601,700

636,700

40,000

681,700
40,000

-

-

601,700
10,000

636,700
35,000

$641,700

$591,700

$601,700

(1)

In November 2011, Gill Ranch issued senior secured notes consisting of $20 million of fixed rate notes with an interest
rate of 7.75 percent and $20 million of variable interest rate notes with an interest rate of LIBOR plus 5.50, or a
minimum of 7.00 percent. Currently, the variable interest rate is 7.00 percent.

Utility Medium-Term Notes

In March 2009, the utility issued $75 million of 5.37 percent secured MTNs due February 1,

2020, and in July 2009 issued another $50 million of 3.95 percent secured MTNs due July 15,
2014. The utility also issued $50 million of MTNs in September 2011 with an interest rate of 3.176
percent and a maturity date of September 15, 2021.

Subsidiary Senior Secured Notes

In November 2011, Gill Ranch issued $40 million of subsidiary senior secured notes with an

interest rate of 7.75 percent on the fixed portion and a 7.00 percent interest rate currently on the

105

variable portion. The notes are secured by all of the membership interests in Gill Ranch Storage, LLC,
and are nonrecourse notes to NW Natural. The maturity date of these notes is November 30, 2016.

Under the note agreements, Gill Ranch is subject to certain covenants and restrictions,
including but not limited to, a financial covenant that requires Gill Ranch to maintain minimum
adjusted earnings before interest, taxes, depreciation and amortization (EBITDA) at various levels over
the term of the notes. The minimum adjusted EBITDA increases incrementally over the first few years,
reaching its highest level in the 12-month period beginning April 1, 2015. Under the note agreements,
Gill Ranch is also subject to a debt service reserve requirement of 10 percent of the outstanding
principal amount, initially $4 million, certain prepayment penalties, restrictions on dividends out of
Gill Ranch unless certain earnings ratios are met, and restrictions on incurrence of additional debt.

Fair Value of Long-Term Debt

The following table provides an estimate of the fair value of our long-term debt including

current maturities of long-term debt, using market prices in effect on the valuation date. Because our
debt outstanding does not trade in active markets, we used interest rates for outstanding debt issues that
actively trade and have similar characteristics such as size, credit ratings, financial terms and
remaining maturities to estimate fair value for our long-term debt issues.

Thousands

Carrying amount
Estimated fair value

8.

Short-term Debt and Credit Facilities

December 31,

2011

2010

$681,700
$808,724

$601,700
$690,126

Our primary source of short-term funds is from the sale of commercial paper and bank
loans. In addition to issuing commercial paper or bank loans to meet seasonal working capital
requirements, short-term debt is used temporarily to fund capital requirements. Commercial paper and
bank loans are periodically refinanced through the sale of long-term debt or equity securities. Our
commercial paper program is supported by one or more committed credit facilities. At December 31,
2011 and 2010, the amounts and average interest rates of commercial paper debt outstanding were
$141.6 million at 0.3 percent and $257.4 million at 0.4 percent, respectively. There were no bank loans
outstanding at December 31, 2011 or 2010.

At NW Natural, we have a multi-year $250 million syndicated credit agreement, pursuant to

which we may extend commitments for additional one-year periods subject to lender approval. We
extended commitments under this syndicated agreement to May 31, 2013. The syndicated agreement
allows us to request increases in the total commitment amount from time to time, up to a maximum
amount of $400 million, and to replace any lenders who decline to extend the terms of the agreement.
The syndicated agreement also permits the issuance of letters of credit in an aggregate amount up to
the applicable total borrowing commitment. Any principal and unpaid interest owed on borrowings
under the syndicated agreement are due and payable on or before the expiration date. There were no
outstanding balances under the syndicated credit agreement and no letters of credit issued or
outstanding at December 31, 2011 and 2010.

The syndicated credit agreement requires that we maintain credit ratings with Standard &

Poor’s (S&P) and Moody’s Investors Service, Inc. (Moody’s) and notify the lenders of any change in

106

our senior unsecured debt ratings by such rating agencies. A change in our debt ratings is not an event
of default, nor is the maintenance of a specific minimum level of debt rating a condition of drawing
upon the credit facility. However, interest rates on any loans outstanding under the credit facility are
tied to debt ratings, which would increase or decrease the cost of any loans under the credit facility
when ratings are changed. There were no changes in our credit ratings during 2011.

The syndicated credit agreement also requires us to maintain a consolidated indebtedness to
total capitalization ratio of 70 percent or less. Failure to comply with this covenant would entitle the
lenders to terminate their lending commitments and accelerate the maturity of all amounts outstanding.
We were in compliance with this covenant at December 31, 2011 and 2010.

9.

Pension and Other Postretirement Benefits

We maintain two qualified non-contributory defined benefit pension plans covering a majority

of our regular NW Natural employees with more than one year of service, several non-qualified
supplemental pension plans for eligible executive officers and certain key employees and other
postretirement employee benefit plans. We also have a qualified defined contribution plan (Retirement
K Savings Plan) for all eligible employees. Only the two qualified defined benefit pension plans and
Retirement K Savings Plan have plan assets, which are held in a qualified trust to fund retirement
benefits. Effective January 1, 2007 and 2010, the qualified defined benefit retirement plans and
postretirement benefits for non-union employees and for union employees, respectively, were closed to
new participants. These plans were not available to employees of our NW Natural subsidiaries. Non-
union and union employees hired or re-hired after December 31, 2006 and 2009, respectively, and
employees of NW Natural subsidiaries are provided an enhanced Retirement K Savings Plan benefit.
Also, effective January 1, 2007, the postretirement Welfare Benefit Plan for Non-Bargaining Unit
Employees was closed to new participants after December 31, 2006.

107

The following table provides a reconciliation of the changes in benefit obligations and fair

value of plan assets, as applicable, for the pension and other postretirement benefit plans, excluding the
Retirement K Savings Plan, for the years ended December 31, 2011, 2010, and 2009, and a summary
of the funded status and amounts recognized in the consolidated balance sheets using measurement
dates as of December 31, 2011, 2010 and 2009:

Thousands

Reconciliation of change in

benefit obligation:
Obligation at January 1
Service cost
Interest cost
Net actuarial (gain) or loss
Benefits paid
Plan amendments

Postretirement Benefit Plans

Pension Benefits
2010

2011

2009

2011

Other Benefits
2010

2009

$ 339,338
7,122
18,134
44,802
(18,269)
-

$ 307,991
6,688
18,029
25,275
(18,645)
-

$ 281,127
6,402
17,948
23,584
(17,149)
(3,921)

$ 27,676
614
1,404
2,225
(1,870)
-

$ 24,741
588
1,436
2,387
(1,476)
-

$ 23,863
522
1,568
216
(1,428)
-

Obligation at December 31

$ 391,127

$ 339,338

$ 307,991

$ 30,049 $ 27,676

$ 24,741

Reconciliation of change in plan

assets:
Fair value of plan assets at

January 1

Actual return on plan assets
Employer contributions
Benefits paid

Fair value of plan assets at

$ 219,014
(6,684)
21,909
(18,269)

$ 201,312
24,651
11,696
(18,645)

$ 163,115
28,641
26,705
(17,149)

$

-
-
1,870
(1,870)

$

-
-
1,476
(1,476)

$

-
-
1,428
(1,428)

December 31

$ 215,970

$ 219,014

$ 201,312

$

-

$

-

$

-

Funded status at December 31

$(175,157) $(120,324) $(106,679) $(30,049) $(27,676) $(24,741)

Our qualified defined benefit pension plans had an aggregate projected benefit obligation of

$362.9 million, $314.5 million and $285.2 million at December 31, 2011, 2010, and 2009,
respectively, and the fair value of plan assets was $216.0 million, $219.0 million and $201.3 million,
respectively. Changes in certain pension assumptions impact our projected benefit obligations. Benefit
obligations at December 31, 2011 increased $40.3 million due to decreases in our discount rate
assumptions and increased by $0.9 million due to changes in other assumptions. The projected benefit
obligations at December 31, 2010 increased $17.9 million over the prior year due to decreases in our
discount rate assumptions and increased by $6.5 million due to changes in other assumptions.

108

The following table provides amounts amortized from accumulated other comprehensive

income (AOCI) or regulatory assets to net periodic benefit cost during 2011, 2010, and 2009:

Regulatory Asset Amortization

Pension Benefits
2010

2011

2009

Other Postretirement Benefits
2010

2011

2009

AOCI Amortization
Pension Benefits
2010

2011

2009

Thousands

Net periodic benefit costs:

Actuarial loss
Prior service cost
Transition obligation

$10,731
230
-

$6,740
230
-

$6,189
1,260
-

Total

$10,961

$6,970

$7,449

$289
197
411

$897

$131
197
411

$739

$ 17
197
411

$625

$854
122
-

$976

$707
(43)
-

$449
(37)
-

$664

$412

In 2012, an estimated $15.5 million will be amortized from regulatory assets to net periodic

benefit costs, consisting of $14.7 million of actuarial losses, $0.4 million of prior service costs and $0.4
million of transition obligations, and $1.0 million will be amortized from AOCI to earnings related to
actuarial losses.

Our assumed discount rate was determined independently for each pension plan and other

postretirement benefit plan based on the Citigroup Above Median Curve (discount rate curve) using
high quality bonds (i.e. rated AA- or higher by S&P or Aa3 or higher by Moody’s). The discount rate
curve was then applied to match the estimated cash flows in each plan to reflect the timing and amount
of expected future benefit payments for these plans.

The assumption for expected long-term rate of return on plan assets was developed as a

weighted average of the expected earnings for the target asset portfolio. In developing the expected
long-term rate of return assumption, consideration was given to the historical performance of each
asset class in which the plans’ assets are invested and the target asset allocation for plan assets.

Our investment strategy and policies for the qualified pension plan assets held in the

Retirement Trust Fund were approved by our retirement committee, which is composed of senior
management employees with the assistance of an investment consultant. The policies set forth the
guidelines and objectives governing the investment of plan assets. Plan assets are invested for total
return with appropriate consideration for liquidity and portfolio risk. All investments are expected to
satisfy the requirements of the rule of prudent investments as set forth under the Employee Retirement
Income Security Act of 1974. The approved asset classes include cash and short-term investments,
fixed income, common stock and convertible securities, absolute and real return strategies, real estate
and investments in our common stock. Plan assets may be invested in separately managed accounts or
in commingled or mutual funds. Investment re-balancing takes place periodically as needed, or when
significant cash flows occur, in order to maintain the allocation of assets within the stated target
ranges. Our expected long-term rate of return is based upon historical index returns by asset class,
adjusted by a factor based on our historical return experience, diversified asset allocation and active
portfolio management by professional investment managers. The Retirement Trust Fund is not
currently invested in any NW Natural securities.

109

The following is our pension plan asset target allocation at December 31, 2011:

Asset Category

U.S. large cap equity
U.S. small/mid cap equity
Non-U.S. equity
Emerging markets equity
Long government/credit
High yield
Emerging market debt
Real estate funds
Absolute return strategy
Real return strategy

Target
Allocation

15.0%
10.0%
14.5%
3.5%
24.0%
5.0%
5.0%
5.8%
12.0%
5.2%

Our non-qualified supplemental defined benefit pension benefit obligations were $28.2

million, $24.9 million and $22.8 million at December 31, 2011, 2010 and 2009, respectively. These
plans are not subject to regulatory deferral and the changes in actuarial gains and losses, prior service
costs and transition assets or obligations are recognized in AOCI under common stock equity, net of
tax, until they are amortized as a component of net periodic benefit cost. Although these are unfunded
plans with no plan assets due to their nature as non-qualified plans, we indirectly fund a portion of our
obligations with company- and trust-owned life insurance.

Our plans for providing postretirement benefits other than pensions also are unfunded plans,
but are subject to regulatory deferral. The gains and losses, prior service costs and transition assets or
obligations for these plans were recognized as a regulatory asset.

Net periodic benefit cost consists of service costs, interest costs, the amortization of actuarial

gains and losses, the expected returns on plan assets and, in part, on a market-related valuation of
assets. The market-related valuation reflects differences between expected returns and actual
investment returns, which are recognized over a three-year period or less from the year in which they
occur, thereby reducing year-to-year net periodic benefit cost volatility.

The following tables provide the components of net periodic benefit cost for the qualified and
non-qualified pension and other postretirement benefit plans for the years ended December 31, 2011,
2010 and 2009 and the assumptions used in measuring these costs and benefit obligations:

Thousands

Service cost
Interest cost
Expected return on plan assets
Amortization of transition obligations
Amortization of prior service costs
Amortization of net actuarial loss

Net periodic benefit cost

Amount allocated to construction
Amount deferred to regulatory

balancing account

Pension Benefits
2010
$ 6,688
18,029
(18,207)
-
187
7,447

2011
$ 7,122
18,134
(17,867)
-
352
11,584

2009
$ 6,402
17,948
(15,696)
-
1,223
6,810

Other Postretirement
Benefits
2010
$ 588
1,436
-
411
197
131

2011
$ 614
1,404
-
411
197
289

2009
$ 522
1,568
-
411
197
-

19,325
(4,905)

14,144
(3,729)

16,687
(4,636)

2,915
(878)

2,763
(904)

2,698
(858)

(6,008)

-

-

-

-

-

Net amount charged to expense

$ 8,412

$ 10,415

$ 12,051

$2,037

$1,859

$1,840

110

Assumptions for net periodic benefit

cost:
Weighted-average discount rate
Rate of increase in compensation
Expected long-term rate of return

Assumptions for funded status:

Weighted-average discount rate
Rate of increase in compensation
Expected long-term rate of return

Pension Benefits
2010

2011

2009

Other Postretirement
Benefits
2010

2011

2009

5.49%

6.01%

3.25-5.0% 3.25-5.0% 3.25-5.0%
8.25%

8.25%

8.25%

6.60% 5.16% 5.78% 7.12%
n/a
n/a

n/a
n/a

n/a
n/a

4.51%

5.49%

3.25-5.0% 3.25-5.0% 3.25-5.0%
8.25%

8.00%

8.25%

6.01% 4.33% 5.16% 5.78%
n/a
n/a

n/a
n/a

n/a
n/a

The assumed annual increase in health care cost trend rates used in measuring other
postretirement benefits as of December 31, 2011 were 8.0 percent for medical and 10.0 percent for
prescription drugs. Medical costs and prescription drugs are assumed to decrease gradually each year
to a rate of 5.0 percent by 2021.

Assumed health care cost trend rates can have a significant effect on the amounts reported for

the health care plans. A one percentage point change in assumed health care cost trend rates would
have the following effects:

Thousands

Effect on net periodic postretirement health care benefit cost
Effect on the accumulated postretirement benefit obligation

1% Increase

1% Decrease

$ 67
$678

$ (60)
$(613)

The impact of a change in retirement benefit costs on operating results would be less than the
amounts shown above because 30 to 40 percent of these amounts would be capitalized to construction
accounts as payroll overhead and included in utility plant, and a certain amount of increases or
decreases could be recorded to the regulatory balancing account for pensions, with the remaining
amount recognized in current earnings.

111

The following table provides information regarding employer contributions and benefit

payments for the two qualified pension plans, non-qualified pension plans and other postretirement
benefit plans for the years ended December 31, 2011 and 2010, and estimated future contributions and
payments:

Thousands

Employer Contributions

Pension Benefits

Other Benefits

2010
2011
2012 (estimated)

Benefit Payments

2009
2010
2011

Estimated Future Payments

2012
2013
2014
2015
2016
2017-2021

$ 12,088
22,325
30,109

17,149
18,645
18,269

19,374
19,620
20,107
20,640
21,284
122,680

$ 1,476
1,870
2,056

1,428
1,476
1,870

2,056
2,083
2,138
2,149
2,198
11,298

We make contributions to our qualified defined benefit pension plans based on actuarial

assumptions and estimates, tax regulations and funding requirements under federal law. The Pension
Protection Act of 2006 (the Act) established new funding requirements for defined benefit plans. The
Act establishes a 100 percent funding target over seven years for plan years beginning after
December 31, 2008. Our qualified defined benefit pension plans are currently underfunded by $146.9
million at December 31, 2011, and we expect to make contributions during 2012 of approximately $28
million.

The Retirement K Savings Plan provided to our employees is a qualified defined contribution
plan under Internal Revenue Code Section 401(k). Our contributions to this plan totaled $2.4 million
2011 and $2.1 million in 2010 and 2009. The Retirement K Savings Plan includes an Employee Stock
Ownership Plan.

The supplemental deferred compensation plans for eligible officers and senior managers are
non-qualified plans. These plans are designed to enhance the retirement savings of employees and to
assist them in strengthening their financial security by providing an incentive to save and invest
regularly.

In addition to the company-sponsored defined benefit plans referred to above, we contribute to

a multiemployer pension plan for our bargaining unit employees known as the Western States Office
and Professional Employees International Union Pension Fund (Western States Plan) in accordance
with our collective bargaining agreement. The employer identification number of the plan is
94-6076144. The cost of this plan is in addition to pension expense in the table above. The Western
States Plan is managed by a board of trustees that includes equal representation from participating
employers and labor unions. Contribution rates are established by collective bargaining agreements,
and benefit levels are set by the board of trustees based on the advice of an independent actuary

112

regarding the level of benefits that agreed-upon contributions are expected to support. The Western
States Plan has reported an accumulated funding deficit for the current plan year and remains in critical
status. A plan is considered to be in critical status if its funded status is 65 percent or less. Federal law
requires pension plans in critical status to adopt a rehabilitation plan designed to restore the financial
health of the plan. Rehabilitation plans may specify benefit reductions, contribution surcharges, or a
combination of the two. The Western States Plan trustees adopted a rehabilitation plan that reduced
benefit accrual rates and adjustable benefits for active employee participants and increased future
employer contribution rates. These changes are expected to improve the funded status of the plan. Our
contributions to the Western States Plan amounted to $0.4 million in 2011, 2010 and 2009 which is
greater than 5 percent of the total contributions to the plan by all participants.

This amount includes the 10 percent contribution surcharge. Contribution surcharges above the

current 10 percent rate will be assessed to employer participants, but these higher surcharges will not
go into effect for NW Natural until its next collective bargaining agreement, which is expected to be no
earlier than June 1, 2014. Under the terms of our current collective bargaining agreement, which
became effective in July 2009, we can withdraw from the Western States Plan at any time. However, if
we withdraw and the plan is underfunded, we could be assessed a withdrawal liability. In accordance
with accounting rules for multiemployer plans, we have not currently recognized these potential
withdrawal liabilities on the balance sheet. Currently, we have no intent to withdraw from the plan, so
we have not recorded a withdrawal liability.

Fair Value

Following is a description of the valuation methodologies used for assets measured at fair

value. In cases where the pension plan is invested through a collective trust fund or mutual fund, our
custodian uses the fund’s market value. The custodian also provides the market values for investments
directly owned.

U.S. large cap equity: These are level 1 assets valued at the closing price reported on the

active market on which the individual security is traded. This asset class includes investments
primarily in U.S. common stocks.

U.S. small/mid cap equity: These are level 2 assets valued based on information provided by

the plan’s investment custodians. The financial statements of the commingled fund are audited
annually by independent accountants. Values for such funds are stated at estimated fair values, which
have been determined based on the unit values of the funds. Unit values are determined by the bank
sponsoring such funds by dividing the fund’s net assets at fair value by its units outstanding at the
valuation date. This asset class includes investments primarily in U.S. common stocks.

Non-U.S. equity: These are level 1 and 2 assets. Level 1 assets are valued at the closing price

reported on the active market on which the individual security is traded. Level 2 assets are valued
based on information provided by the plan’s investment custodians. The financial statements of the
commingled fund are audited annually by independent accountants. Values for such funds are stated at
estimated fair values, which have been determined based on the unit values of the funds. Unit values
are determined by the bank sponsoring such funds by dividing the fund’s net assets at fair value by its
units outstanding at the valuation date. This asset class includes investments primarily in foreign equity
common stocks.

113

Emerging market equity: These are level 1 assets valued at the net asset value of the shares

held by the plan at the valuation date. This asset class includes investments primarily in common
stocks in emerging markets.

Fixed income: These are level 1 assets valued at the net asset value of the shares held by the

plan at the valuation date. This asset class includes investments primarily in investment grade debt and
fixed income securities.

Long Government/Credit: These are level 2 assets whose values are determined by closing
values if available and by matrix pricing for illiquid securities. This asset class includes long duration
fixed income investments primarily in U.S. treasuries, U.S. government agencies, municipal securities,
mortgage-backed securities, asset-backed securities, as well as U.S. and international investment-grade
corporate bonds.

Real estate funds: These are level 3 assets valued based on the interest held by the plan, for

which fair values of the underlying investments are subject to appraisal as directed by the funds’
management. This asset class includes a real estate fund that invests directly in real estate. The
underlying properties held in the funds are appraised utilizing the following approaches: the cost
approach (the current cost of replacing the real estate less deterioration and functional and economic
obsolescence); the income approach (the ability of the underlying properties to generate net rental
income); and the comparable sales approach (recent sales of comparable real estate in the same
market). The plan’s ability to redeem these investments is subject to certain restrictions and cash
availability.

Absolute return strategy: These are level 2 assets valued based on information provided by
the plan’s investment custodians. The financial statements of the partnerships are audited annually by
independent accountants, with the value of the underlying investments based on the estimated fair
value of the various holdings in the portfolio as reported in the financial statements at net asset
value. This asset class includes a hedge fund. Our investment normally provides for a quarterly
distribution subject to 95 days advance notice of withdrawal. Currently there are no restrictions on
withdrawal requests, and as of December 31, 2011 we have not submitted a withdrawal request.

Real return strategy: These are level 1 assets valued at the net asset value of the shares held
by the plan at the valuation date. This asset class includes an investment in a broad range of assets and
strategies primarily including fixed income and equity securities, along with commodities.

Cash and cash equivalents: These are level 2 assets valued at the net asset value of the shares
held by the plan at the valuation date. This asset class primarily includes a money market mutual fund.

The preceding valuation methods may produce a fair value calculation that is not indicative of
net realizable value or reflective of future fair values. Although we believe these valuation methods are
appropriate and consistent with other market participants, the use of different methodologies or
assumptions to determine the fair value of certain financial instruments could result in a different fair
value measurement at the reporting date.

Investment securities are exposed to various financial risks including interest rate, market and

credit risks. Due to the level of risk associated with certain investment securities, it is reasonably
possible that changes in the values of our investment securities will occur in the near term and that
such changes could materially affect our investment account balances and the amounts reported as plan
assets available for benefits payments.

114

The following table presents the fair value of plan assets, including outstanding receivables

and liabilities, of the Retirement Trust Fund as of December 31, 2011 and 2010:

Investments, in thousands

U.S. large cap equity
U.S. small/mid cap equity
Non-U.S. equity
Emerging markets equity
Fixed income
Long government/credit
Real estate funds
Absolute return strategy
Real return strategy
Cash and cash equivalents

Total investments

Investments, in thousands

U.S. large cap equity
U.S. small/mid cap equity
Non-U.S. equity
Emerging markets equity
Fixed income
Real estate funds
Absolute return strategy
Real return strategy
Cash and cash equivalents

Total investments

Receivables

Accrued interest and dividend income
Due from broker for securities sold

Total receivables

Liabilities
Due to broker for securities purchased

Total investment in retirement trust

Level 1

$ 36,236
-
22,158
10,208
19,121
-
-
-
15,475
-

December 31, 2011
Level 2 Level 3

$

-
27,310
11,587
-
-
18,897
-
30,475
-
9,290

$

-
-
-
-
-
-
15,317
-
-
-

Total

$ 36,236
27,310
33,745
10,208
19,121
18,897
15,317
30,475
15,475
9,290

$103,198

$97,559

$15,317

$216,074

Level 1

$ 37,231
-
24,630
11,476
36,429
-
-
15,452
-

December 31, 2010
Level 2 Level 3

$

-
27,864
14,549
-
-
-
32,378
-
3,629

$

-
-
-
-
-
14,721
-
-
-

Total

$ 37,231
27,864
39,179
11,476
36,429
14,721
32,378
15,452
3,629

$125,218

$78,420

$14,721

$218,359

December 31,

2011

2010

414
321

735

$

$

249
448

697

839

$

42

$

$

$

$215,970

$219,014

115

Level 3 Investments

The following table presents the beginning balance, activity and ending balance of Level 3

investments that have their fair values established using significant unobservable inputs as of
December 31, 2011:

Thousands

January 1, 2011 balance
Total gains or (losses):

Included in earnings (or changes in net assets)

December 31, 2011 balance

10.

Income Tax

Level 3 Assets
Real estate Funds

$14,721

596

$15,317

A reconciliation between income taxes calculated at the statutory federal tax rate and the

provision for income taxes reflected in the consolidated financial statements is as follows:

Thousands, except percentages

Income taxes at federal statutory rate
Increase (decrease):

Current state income tax, net of federal tax benefit
Amortization of investment and energy tax credits
Differences required to be flowed-through by regulatory

commissions

Gains on company and trust-owned life insurance
Other—net

Total provision for income taxes

Effective tax rate

2011

2010

2009

$37,550

$42,745

$42,627

4,945
(442)

1,647
(786)
468

5,803
(525)

1,647
(715)
507

5,568
(593)

(116)
(1,195)
380

$43,382

$49,462

$46,671

40.4%

40.5%

38.3%

The provision (benefit) for current and deferred income taxes consists of the following:

Thousands
Current

Federal
State

Deferred

Federal
State

Total provision for income taxes

Total income taxes paid

2011

2010

2009

$

130
(929)
(799)

$(28,592) $ 6,221
2,300
8,521

1,441
(27,151)

35,481
8,700
44,181
$43,382

69,159
7,454
76,613
$ 49,462

31,937
6,213
38,150
$46,671

$ 1,756

$ 22,600

$10,000

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The following table summarizes the total provision (benefit) for income taxes for the regulated

utility and non-utility business segments for the three years ended December 31:

Thousands
Regulated utility:
Current
Deferred
Deferred investment and energy tax credits

Non-utility business segments:

Current
Deferred

Total provision for income taxes

2011

2010

2009

$ (4,646) $ (1,464) $
50,152
(422)
45,084

47,741
(525)
45,752

871
40,829
(593)
41,107

3,846
(5,548)
(1,702)
$43,382

(25,687)
29,397
3,710
$ 49,462

7,650
(2,086)
5,564
$46,671

The following table summarizes the tax effect of significant items comprising our deferred

income tax accounts for the two years ended December 31:

Thousands
Deferred tax liabilities:
Plant and property
Regulatory adjustment for income taxes paid
Regulatory income tax assets
Regulatory liabilities
Non-regulated deferred tax liabilities

Total

Deferred tax assets:

Regulatory assets
Unfunded pension and postretirement obligations
Non-regulated deferred tax assets
Alternative minimum tax credit carryforward
Loss and credit carryforwards

Total

Deferred income tax liabilities—net
Deferred investment tax credits
Deferred income taxes and investment tax credits

2011

2010

$292,235
2,106
65,755
35,638
43,373
$439,107

$255,471
5,272
68,822
23,159
34,544
$387,268

$ (4,727) $ (1,402)
(4,342)
(772)
(1,702)
(7,071)
(15,289)
371,979
1,430
$373,409

(5,119)
(1,161)
(1,626)
(14,255)
(26,888)
412,219
990
$413,209

We have determined that we are more likely than not to realize all recorded deferred tax assets

as of December 31, 2011.

We calculate our deferred tax assets and liabilities according to accounting guidance on
income taxes, whereby deferred income taxes are generally determined based on the difference
between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect
in the years in which the differences are expected to reverse. Deferred tax provisions are not recorded
in the income statement for certain temporary differences where regulators require that we flow
through deferred income tax benefits or expenses in the utility ratemaking process.

In September 2010, Congress passed the Unemployment Insurance, Reauthorization and Job
Creation Act of 2010 (the Act) and the legislation was signed into law by President Obama. The Act
extended for one year the temporary bonus depreciation rules first enacted in the Economic Stimulus

117

Act of 2008 and subsequently renewed in the American Recovery and Reinvestment Act of 2009.
Under the bonus depreciation provision, an additional first-year tax deduction was allowed for
depreciation equal to 50 percent of the adjusted basis of qualified property through September 8, 2010,
in the year the property was placed in service, with the remaining percentage recovered under the
normal depreciation rules. In addition, on December 17, 2010, President Barack Obama signed into
law the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 (Tax
Relief Act), which allows 100 percent bonus depreciation for qualified property placed in service
between September 9, 2010 through December 31, 2011. It also extended the 50% bonus depreciation
deduction to qualifying property placed in service through 2012.

In 2011 the Company received a tax refund of $14.4 million for tax year 2010. In addition, the
company carried back a portion of its 2010 net operating loss to tax year 2009 and received a refund of
$22.3 million. In 2011 we filed an amended federal income tax return for 2009, primarily to report a
deduction for repairs expense consistent with a change in accounting method approved by the IRS and
in conformity with the deduction allowed by the IRS in its examination of years 2006-2008. The
Company then amended its net operating loss carryback to tax year 2009. The result of the amended
federal tax return for tax year 2009 and the amended net operating loss carryback is a federal income
tax refund receivable of $3.5 million at December 31, 2011. The company estimates that it has a
consolidated net operating loss carryforward to 2012 of $33.7 million. The net operating loss
carryforward will be carried forward to reduce our current tax liability in future years. We anticipate
that we will be able to utilize the entire net operating loss carryforward before its expiration in twenty
years.

For the year ended December 31, 2010, we reported taxable income for Oregon purposes due
to lack of federal-state conformity with respect to the accelerated depreciation effects cited above. The
Company recorded a current receivable of $3.5 million to reflect the excess of payments applied to
year 2010 over the amount owed. The Company received this refund in the first quarter of 2012. As of
January 1, 2011, Oregon conformed to federal rules including bonus depreciation. As a result, we
anticipate generating an NOL for state purposes in 2011. Oregon does not allow NOL carrybacks, but
allows NOLs to be carried forward for fifteen years. We expect to fully utilize the estimated NOL
generated in 2011.

Uncertain tax positions are accounted for in accordance with accounting standards that require

management’s assessment of the expected treatment of a tax position taken in a filed tax return, or
planned to be taken in a future tax return, that has not been reflected in measuring income tax expense
for financial reporting purposes. Until such positions are sustained by the taxing authorities, we would
not recognize the tax benefits resulting from such positions and would report the tax effect as a liability
in the Company’s consolidated balance sheet. As of December 31, 2011, we had no uncertain tax
positions.

The IRS completed its examination of the 2006 through 2008 tax years in 2011. The

examination resulted in payments of $1.5 million of tax and $0.2 million of interest. The Oregon
Department of Revenue (ODOR) completed its field examination of our 2006 through 2009
consolidated Oregon income tax returns and issued preliminary assessments. If sustained by the
ODOR, these assessments would result in an additional state tax liability of approximately $0.8
million, including interest and penalties. The Company is engaged in discussions with ODOR to
resolve these issues; however, uncertainty exists with respect to the outcome of the audit as a result of
information not yet fully considered by the ODOR. Resolution is expected to be reached within the

118

next 12 months, and we have determined that it is more-likely-than-not that we will prevail on these
issues. As such, no amounts have been recorded in our financial statements as of December 31, 2011
related to this matter.

Interest and penalties related to any future income tax deficiencies are recorded within income

tax expense in the consolidated statements of income.

11.

Property, Plant and Equipment

The following table sets forth the major classifications of our property, plant and equipment

and accumulated depreciation at December 31:

Thousands

Utility plant in service
Utility construction work in progress
Less accumulated depreciation

Utility plant-net

Non-utility plant in service
Non-utility construction work in progress
Less accumulated depreciation

Non-utility plant-net

Total property plant and equipment

2011

2010

$2,323,467
36,051
749,603

$2,247,952
29,324
710,214

1,609,915

1,567,062

293,205
8,379
17,623

283,961

290,038
9,088
12,025

287,101

$1,893,876

$1,854,163

The weighted average depreciation rate for utility assets was 2.8 percent in 2011 and 2010.

The weighted average depreciation rate for non-utility assets was 2.2 percent in 2011 and 2.5 percent in
2010.

Accumulated depreciation does not include the accumulated provision for asset removal costs

of $267.4 million and $252.9 million at December 31, 2011 and 2010, respectively. These accrued
asset removal costs are reflected on the balance sheets as regulatory liabilities (see Note 2, “Plant,
Property and Accrued Asset Removal Costs”).

12.

Gas Reserves and Other Investments

Our gas reserves are stated at cost, net of regulatory amortization, with the associated deferred

tax benefits recorded as liabilities on the balance sheet. Other investments include financial
investments in life insurance policies, which are accounted for at fair value, and equity investments in
certain partnerships and limited liability companies, which are accounted for under the equity or cost
methods. The following table summarizes our other investments at December 31:

Thousands

Investments in life insurance policies
Investments in gas pipeline joint ventures
Other

Total other investments

2011

2010

$51,911
14,340
2,012

$51,090
15,742
2,262

$68,263

$69,094

119

Gas Reserves

We entered into an agreement with Encana to develop physical gas reserves that are expected

to supply a portion of our utility customers’ requirements over the next 30 years. The volume of gas
produced and allocated to us under the agreement will increase in the early years as we continue to
invest in drilling, with volumes expected to peak at about 13 percent of our utility’s gas supply
requirement in gas year 2015-2016. Over the first 10 years of the agreement (2011-2020), volumes are
expected to average approximately 8 to 10 percent of the annual gas purchase requirements of our
utility customers. Under the agreement, we expect to invest approximately $45 million to $55 million
per year for five years, and our total investment is expected to be approximately $250 million.

Upon reviewing the transaction, the OPUC determined that our costs under the agreement will
be recovered on an ongoing basis through its annual PGA mechanism, including the regulatory deferral
and incentive sharing process for the commodity cost of gas. Annually, a forecast will be established
for the amounts related to costs and volumes expected, and any variances between forecasted and
actual will be subject to the PGA incentive sharing in Oregon, up to a maximum variance of $10
million of which 10 percent (or $1 million maximum) would be recognized in current income.
Variances in excess of $10 million, both negative and positive, will be deferred and passed through to
customers in future rates at 100 percent. As part of the decision by the OPUC, we agreed to file a
general rate case in Oregon no later than December 31, 2011.

Encana began drilling in May 2011 under the agreements referred to above, and we are

currently receiving gas from our interests in a section of the gas field. In 2011, volumes from gas
reserves were less than one percent of our total gas purchases. Our net investment at December 31,
2011 is $36.3 million, including deferred tax liabilities totaling $15.6 million.

Variable Interest Entity (VIE) Analysis. We concluded that the arrangements with Encana

qualify as a VIE, but that we are not the primary beneficiary of these activities as defined by the
authoritative guidance related to consolidations due to the fact that our interest represents a minor
portion of total extraction activities. We account for our investment in this VIE on the cost basis, and it
is included under gas reserves on our balance sheet. Our maximum loss exposure related to this VIE is
limited to our investment balance.

Palomar

Palomar, a wholly-owned subsidiary of PGH, is pursuing the development of a new gas
transmission pipeline that would provide an interconnection with our utility distribution system. PGH
is owned 50 percent by NWN Energy and 50 percent by TransCanada American Investments Ltd., an
indirect wholly-owned subsidiary of TransCanada Corporation. PGH is a development stage variable
interest entity.

Variable Interest Entity (VIE) Analysis. As of December 31, 2011, we updated our VIE

analysis and reconfirmed that we are not the primary beneficiary of PGH’s activities as defined by the
authoritative guidance related to consolidations due to the fact that we have a 50 percent share and
there are no stipulations that allow disproportionate influence over the entity. Therefore, we account
for our investment in PGH and the Palomar project under the equity method, which is included in other
investments on our balance sheet. Our maximum loss exposure related to PGH is limited to our equity
investment balance, less our share of any cash or other assets available to us as a 50 percent owner.

120

Impairment Analysis. Our investments in nonconsolidated entities accounted for under the

equity method are reviewed for impairment at each reporting period, and following updates to our
corporate planning assumptions. When it is determined that a loss in value is other than temporary, a
charge is recognized for the difference between the investment’s carrying value and its estimated fair
value. Fair value is based on quoted market prices when available, or on the present value of expected
future cash flows. Differing assumptions could affect the timing and amount of a charge recorded in
any period.

In 2011, our investment in PGH was reviewed for impairment when Palomar withdrew its

original application with the FERC for a proposed natural gas pipeline in Oregon. At the same time,
Palomar informed FERC that it intended to re-file an application to reflect changes in the project
scope, which was expected to eliminate the western portion of the proposed pipeline and align the
revised project with the region’s current and future gas infrastructure needs. Palomar is working with
customers in the Pacific Northwest to further understand their gas transportation needs and determine
the commercial support for a revised pipeline proposal. We expect to file a new FERC certificate
application to reflect a revised scope based on regional needs.

The evaluation of assets related to the west portion of the Palomar pipeline determined that

these costs were impaired, and as a result we recorded a pre-tax charge of $0.3 million for our share of
the project. An evaluation of the assets related to the east portion was also performed in 2011, and a
charge of $1.0 million was recorded. The east segment charge was related to costs that would
potentially be outdated and, if so, would need to be redone for the refiled application. Our remaining
investment balance in Palomar was $13.5 million at December 31, 2011, which consists of costs
related to the east segment. We also determined that our remaining equity investment was not impaired
because the fair value of expected cash flows from planned development of the eastern portion of the
pipeline project exceeds our equity investment. However, if we learn later that the project is not viable
or will not go forward, then we could be required to recognize a maximum charge of up to
approximately $13.2 million based on the current amount of our equity investment net of cash and
working capital at Palomar. We will continue to monitor and update our impairment analysis as
required.

Investment in Life Insurance Policies

We have invested in key person life insurance contracts to provide an indirect funding vehicle

for certain long-term employee and director benefit plan liabilities. The amount in the above table is
reported as cash surrender value, net of policy loans.

13.

Derivative Instruments

We enter into swap, option and combinations of option contracts for the purpose of hedging

natural gas. We primarily use these derivative financial instruments to manage commodity prices
related to our natural gas purchase requirements. A small portion of our derivative hedging strategy
involves foreign currency exchange transactions related to purchases of natural gas from Canadian
suppliers.

In the normal course of business, we enter into indexed-price physical forward natural gas

commodity purchase (gas supply) contracts to meet the requirements of core utility customers. We also
enter into financial derivatives, up to prescribed limits, to hedge price variability related to these

121

physical gas supply contracts. Derivatives entered into prudently for future gas years prior to our
annual PGA filing receive regulatory deferred accounting treatment. Derivative contracts entered into
after the annual PGA rate is set for the current gas contract year are subject to our PGA incentive
sharing mechanism, which provides for either an 80 or a 90 percent deferral of any gains and losses as
regulatory assets or liabilities, with the remaining 10 or 20 percent recognized in current income. All of
our commodity hedging for the 2011-12 gas year was completed prior to the start of the gas year, and
these hedge prices were included in our PGA filing.

Certain natural gas purchases from Canadian suppliers are payable in Canadian dollars,
including both commodity and demand charges, which expose us to adverse changes in foreign
currency rates. Foreign currency forward contracts are used to hedge the fluctuation in foreign
currency exchange rates for our commodity and commodity-related demand charges paid in Canadian
dollars. Foreign currency contracts for commodity costs are purchased on a month-to-month basis
because the Canadian cost is priced at the average noon-day exchange rate for each month. Foreign
currency contracts for demand costs have terms ranging up to 12 months. The gains and losses on the
shorter-term currency contracts for commodity costs are recognized immediately in cost of gas. The
gains and losses on the currency contracts for demand charges are not recognized in current income
because they are subject to a regulatory deferral tariff and, as such, are recorded as a regulatory asset or
liability. The mark-to-market adjustment at December 31, 2011 was an unrealized loss of $0.2
million. This unrealized gain is subject to regulatory deferral and, as such, was recorded as a derivative
instrument, which is offset by recording a corresponding amount to a regulatory liability account.

Derivative hedge contracts are subject to a hedge effectiveness test to determine the financial
statement treatment of each specific derivative. As of December 31, 2011, all of our derivatives were
effective economic hedges and either qualified or were expected to qualify for regulatory deferral or
hedge accounting treatment. The effectiveness test applied to financial derivatives is dependent on the
type of derivative and its use. We use the hypothetical derivative method under accounting standards
for derivatives and hedging to determine the hedge effectiveness for our interest rate swaps and the
dollar offset method for other derivative contracts under accounting standards for derivatives and
hedging. All derivatives were effective as of December 31, 2011.

The following table reflects the income statement presentation for the unrealized gains and
losses from our derivative instruments for the year ended December 31, 2011 and 2010. All of our
currently outstanding derivative instruments are related to regulated utility operations as illustrated by
the derivative gains and losses being deferred to balance sheet accounts in accordance with regulatory
accounting standards.

Thousands

Cost of sales
Other comprehensive income (loss)
Less:
Amounts deferred to regulatory
accounts on balance sheet

Total impact on earnings

2011

2010

Natural gas
commodity (1)

Foreign
exchange (2)

Natural gas
commodity (1)

Foreign
exchange (2)

$(60,799)
-

$

-
(201)

$(52,677)
-

60,799

$

-

201

$

-

52,677

$

-

$

-
91

(91)

$

-

(1)

Unrealized gain (loss) from natural gas commodity hedge contracts is recorded in cost of sales and reclassified to
regulatory deferral accounts on the balance sheet.

122

(2) Unrealized gain (loss) from foreign exchange forward purchase contracts is recorded in other comprehensive

income, and reclassified to regulatory deferral accounts on the balance sheet.

No collateral was posted with or by our counterparties as of December 31, 2011 or 2010. We

attempt to minimize the potential exposure to collateral calls by counterparties to manage our liquidity
risk. Counterparties generally allow a certain credit limit threshold before requiring us to post collateral
against loss positions. Given our counterparty credit limits and diversification, we have not been
subject to collateral calls in 2010 or 2011. Our collateral call exposure is set forth under credit support
agreements, which generally contain credit limits. We could also be subject to collateral call
exposure where we have agreed to provide adequate assurance, which is not specific as to the amount
of credit limit allowed, but could potentially require additional collateral in the event of a material
adverse change. Based upon current contracts outstanding, which reflect unrealized losses of $63.5
million at December 31, 2011, we have estimated the level of collateral demands, with and without
potential adequate assurance calls, using current gas prices and various downgrade credit rating
scenarios for NW Natural as follows:

Thousands

Credit Rating Downgrade Scenarios

(Current
Ratings)
A+/A3 BBB+/Baa1 BBB/Baa2

BBB-/Baa3

Speculative

With Adequate Assurance Calls
Without Adequate Assurance Calls

$-
$-

$-
$-

$2,013
$ 851

$9,585
$5,923

$45,869
$37,206

As of December 31, 2011 and 2010, we realized net losses of $56.5 million and $61.0 million,

respectively, from the settlement of natural gas hedge contracts at maturity, which were recorded as
increases to the cost of gas. The currency exchange rate in all foreign currency forward purchase
contracts is included in our purchased cost of gas at settlement; therefore, no gain or loss is recorded
from the settlement of those contracts.

We are exposed to derivative credit risk primarily through securing pay-fixed natural gas

commodity swaps to hedge the risk of price increases for our natural gas purchases on behalf of
customers. We utilize master netting arrangements through International Swaps and Derivatives
Association contracts to minimize this risk along with collateral support agreements with
counterparties based on their credit ratings. In certain cases we require guarantees or letters of credit
from counterparties in order for them to meet our minimum credit requirement standards.

Our financial derivatives policy requires counterparties to have a certain investment-grade

credit rating at the time the derivative instrument is entered into, and the policy specifies limits on the
contract amount and duration based on each counterparty’s credit rating. We do not speculate on
derivatives; instead we utilize derivatives to hedge our exposure above risk tolerance limits. Any
increase in market risk created by the use of derivatives should be offset by the exposures they modify.

We actively monitor our derivative credit exposure and place counterparties on hold for

trading purposes or require other forms of credit assurance, such as letters of credit, cash collateral or
guarantees as circumstances warrant. Our ongoing assessment of counterparty credit risk includes
consideration of credit ratings, credit default swap spreads, bond market credit spreads, financial
condition, government actions and market news. We utilize a Monte-Carlo simulation model to
estimate the change in credit and liquidity risk from the volatility of natural gas prices. We use the
results of the model to establish earnings-at-risk trading limits. Our credit risk for all outstanding
derivatives at December 31, 2011 currently does not extend beyond October 2013.

123

We could become materially exposed to credit risk with one or more of our counterparties if
natural gas prices experience a significant increase. If a counterparty were to become insolvent or fail
to perform on its obligations, we could suffer a material loss, but we would expect such loss to be
eligible for regulatory deferral and rate recovery, subject to prudency review. All of our existing
counterparties currently have investment-grade credit ratings.

Fair Value

In accordance with fair value accounting, we include nonperformance risk in calculating fair

value adjustments. This includes a credit risk adjustment based on the credit spreads of our
counterparties when we are in an unrealized gain position, or on our own credit spread when we are in
an unrealized loss position. Our assessment of non-performance risk is generally derived from the
credit default swap market and from bond market credit spreads. The impact of the credit risk
adjustments for all outstanding derivatives was immaterial to the fair value calculation at December 31,
2011. As of December 31, 2011 and 2010, the fair value was a liability of $61.0 million and $52.6
million, respectively, using significant other observable, or level 2, inputs. We have used no level 3
inputs in our derivative valuations. We also did not have any transfers between level 1 or level 2 during
the years ended December 31, 2011 and 2010.

14.

Leases

We lease land, buildings and equipment under agreements that expire in various years through

2095. Rental expense under operating leases was $5.4 million, $5.1 million and $5.3 million for the
years ended December 31, 2011, 2010 and 2009, respectively. The table below reflects the future
minimum lease payments due under non-cancelable leases at December 31, 2011. These commitments
relate principally to the lease of our office headquarters, underground gas storage facilities, vehicles
and computer equipment.

Thousands

Operating leases
Capital leases

2012

2013

2014

2015

2016

Later
years

Total

$4,929
443

$4,841
313

$5,078
118

$5,042
23

$5,018
-

$24,659
-

$49,567
897

Minimum lease payments

$5,372

$5,154

$5,196

$5,065

$5,018

$24,659

$50,464

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15.

Commitments and Contingencies

Gas Purchase and Pipeline Capacity Purchase and Release Commitments

We have signed agreements providing for the reservation of firm pipeline capacity under

which we are required to make fixed monthly payments for contracted capacity. The pricing
component of the monthly payment is established, subject to change, by U.S. or Canadian regulatory
bodies. In addition, we have entered into long-term sale agreements to release firm pipeline
capacity. We also enter into short-term and long-term gas purchase agreements. The aggregate
amounts of these agreements were as follows at December 31, 2011:

Thousands

2012
2013
2014
2015
2016
Thereafter

Total
Less: Amount representing interest

Gas
Purchase
Agreements

Pipeline
Capacity
Purchase
Agreements

Pipeline
Capacity
Release
Agreements

$ 98,534
18,331
15,290
5,651
-
-

137,806
682

$ 91,027
87,983
82,898
72,316
61,358
287,541

683,123
99,252

$3,464
-
-
-
-
-

3,464
2

$3,462

Total at present value

$137,124

$583,871

Our total payments for fixed charges under capacity purchase agreements in 2011, 2010 and

2009 were $94.2 million, $91.4 million and $84.6 million, respectively. Included in the amounts were
reductions for capacity release sales of $3.1 million for 2011 and $4.2 million for 2010 and 2009. In
addition, per-unit charges are required to be paid based on the actual quantities shipped under the
agreements. In certain take-or-pay purchase commitments, annual deficiencies may be offset by
prepayments subject to recovery over a longer term if future purchases exceed the minimum annual
requirements.

Environmental Matters

We own, or previously owned, properties that may require environmental remediation or

action. We recognize an environmental liability when it is probable the liability exists and the amount
is reasonably estimable. We estimate the duration and extent of our remediation obligations based upon
reports of outside consultants; internal analyses of clean-up costs and ongoing monitoring costs;
communications with regulatory agencies; and changes in environmental law. If we were to determine
that our estimates of the duration or extent of our environmental obligations were no longer accurate,
we would adjust our environmental liabilities accordingly in the period that such determination is
made. Estimated future expenditures for environmental remediation are not discounted to their present
value. Accrued environmental liabilities are not reduced by potential insurance reimbursements. We
continue to study and evaluate the extent of our potential environmental liabilities, but due to the
numerous uncertainties surrounding the course of environmental remediation and the preliminary
nature of several site investigations, in some cases, we may not be able to reasonably estimate the high
end of the range of possible loss which could be material. In those cases we have disclosed the nature
of the potential loss and the fact that the high end of the range cannot be reasonably estimated.

125

We estimate the range of loss for environmental liabilities using current technology, enacted

laws and regulations, industry experience gained at similar sites and an assessment of the probable
level of involvement and financial condition of other potentially responsible parties. Unless there is an
estimate within this range of possible losses that is more likely than other cost estimates, we record the
liability at the lower end of this range. It is likely that changes in these estimates and ranges will occur
throughout the remediation process for each of these sites due to uncertainty concerning our
responsibility, the complexity of environmental laws and regulations and the selection of potentially
compliant remediation alternatives. The status of each of the sites currently under investigation is
provided below.

We regularly review our environmental liability for each site where we may be exposed to

remediation responsibilities. The costs of environmental remediation are difficult to estimate. A
number of steps are involved in each environmental remediation effort, including site investigations,
remediation, operations and maintenance, monitoring and site closure. Each of these steps may, over
time, involve a number of alternative actions, each of which can change the course and scope of the
effort. Many of these steps are dependent upon the approval and direction of federal and state
environmental regulators. The policies, determinations and directions of the regulators may develop
and change over time and different regulators may take different positions on the various steps,
creating further uncertainty as to the timing and scope of remediation activities. In certain cases, in
addition to us, there are a number of other potentially responsible parties, each of which, in
proceedings and negotiations with other potentially responsible parties and regulators, may influence
the course and scope of the remediation effort. The allocation of liabilities among the potentially
responsible parties is often subject to dispute and can be highly uncertain. The events giving rise to
environmental liabilities often occurred many decades ago, which complicates the determination of
allocating liabilities among potentially responsible parties. Site investigations and remediation efforts
often develop slowly over many years. In addition, disputes may arise between potentially responsible
parties and regulators as to the severity of particular environmental matters and what remediation
efforts are appropriate. These disputes could lead to adversarial administrative proceedings or
litigation, with uncertain outcomes.

Gasco site. We own property in Multnomah County, Oregon that is the site of a former gas

manufacturing plant that was closed in 1956 (Gasco site). The Gasco site has been under investigation
by us for environmental contamination under the Oregon Department of Environmental Quality’s
(ODEQ) Voluntary Clean-Up Program. In June 2003, we filed a Feasibility Scoping Plan and an
Ecological and Human Health Risk Assessment with the ODEQ, which outlined a range of compliant
remedial alternatives for the most contaminated portion of the Gasco site. In May 2007, we completed
a revised Remediation Investigation Report and submitted it to the ODEQ for review. We also
submitted a Focused Feasibility Study (FFS) for the groundwater source control portion of the Gasco
site, which ODEQ conditionally approved in March 2008, subject to the submission of additional
information. We provided that information to ODEQ and are now working with the agency on the final
design of the source control system. Based on the information currently available for groundwater
source control at the Gasco site and our current assumptions regarding remediation, we have estimated
a range of liability between $11 million and $30 million, for which we have recorded an accrued
liability of $12 million at December 31, 2011. The range of liability will be reassessed when ODEQ
makes a final source control design decision, expected later this year.

In addition to groundwater source control, we signed a joint Order on Consent with the
Environmental Protection Agency (EPA), which requires us to design remedial action for sediments

126

from the Gasco site. This design project is underway. We also have other investigation and clean-up
work, including potential work on the uplands portion of the Gasco site. For the sediments project and
upland work, we have recorded an additional accrued liability of $49.2 million, which reflects the low
end of the range of potential liability. We have accrued at the low end of the range of potential liability
for the work at the Gasco site because no amount within the range is considered to be more likely than
another, and the high end of the range cannot reasonably be estimated. However, during 2012, we
expect EPA to complete a feasibility study that will provide additional cost information about the
sediment cleanup work.

Siltronic site. We previously owned property adjacent to the Gasco site that now is the

location of a manufacturing plant owned by Siltronic Corporation (Siltronic site). We are currently
conducting an investigation of manufactured gas plant wastes on the uplands at this site for the
ODEQ. The liability accrued at December 31, 2011 for the Siltronic site is $1.0 million, which is at the
low end of the range of potential liability because no amount within the range is considered to be more
likely than another, and the high end of the range cannot reasonably be estimated.

Portland Harbor site. In 1998, the ODEQ and the EPA completed a study of sediments in a

5.5-mile segment of the Willamette River (Portland Harbor) that includes an area adjacent to the Gasco
and Siltronic sites. The Portland Harbor was listed by the EPA as a Superfund site in 2000 and we were
notified that we are a potentially responsible party. We then joined with other potentially responsible
parties, referred to as the Lower Willamette Group, to fund environmental studies in the Portland
Harbor to allow the EPA to develop a feasibility study. Subsequently, the EPA approved a
Programmatic Work Plan, Field Sampling Plan and Quality Assurance Project Plan for the Portland
Harbor Remedial Investigation/Feasibility Study (RI/FS), completion of which is scheduled for 2012.
The EPA and the Lower Willamette Group are conducting more focused studies on approximately nine
miles of the lower Willamette River, including the 5.5-mile segment previously studied by the EPA.
Further, in August 2008, we signed a cooperative agreement with the Portland Harbor Natural
Resource Trustee Council to participate in a phased natural resource damage (NRD) assessment. The
NRD assessment is intended to identify additional information necessary to estimate further liabilities
to support an early restoration-based settlement of natural resource damage claims. During 2012, the
Lower Willamette Group will submit a draft feasibility study for this site to EPA, resulting in more
information regarding the scope of potential costs. We expect that the feasibility study will allow us to
estimate a range of potential liability and that the range may include significant estimates of potential
liability. As of December 31, 2011, we have a liability accrued of $8.2 million for this site, which is at
the low end of the range of the potential liability because no amount within the range is considered to
be more likely than another, and the high end of the range cannot reasonably be estimated.

Central Service Center site. In 2006, we received notice from the ODEQ that our Central
Service Center in southeast Portland (Central Service Center site) was assigned a high priority for
further environmental investigation. Previously there were three manufactured gas storage tanks on the
premises. The ODEQ believes there could be site contamination associated with releases of condensate
from stored manufactured gas as a result of historic gas handling practices. In the early 1990s, we
excavated waste piles and much of the contaminated surface soils and removed accessible waste from
some of the abandoned piping. In early 2008, we received notice that this site was added to the
ODEQ’s list of sites where releases of hazardous substances have been confirmed and to its list where
additional investigation or cleanup is necessary. We are currently performing an environmental
investigation of the property with the ODEQ’s Independent Cleanup Pathway. As of December 31,
2011, we have a liability accrued of $0.5 million for investigation at this site. The estimate is at the low

127

end of the range of potential liability because no amount within the range is considered to be more
likely than another and the high end of the range cannot reasonably be estimated.

Front Street site. The Front Street site was the former location of a gas manufacturing plant
we operated. It is near but outside the geographic scope of the current Portland Harbor site sediment
studies. The EPA directed the Lower Willamette Group to collect a series of surface and subsurface
sediment samples off the river bank adjacent to where that facility was located. Based on the results of
that sampling, the EPA notified the Lower Willamette Group that additional sampling would be
required. As the Front Street site is upstream from the Portland Harbor site, the EPA agreed that we
could manage the site separately from the Portland Harbor site under ODEQ authority. We submitted
work plans for source control investigation and a historical report to ODEQ and completed initial
studies. In 2010, ODEQ required additional studies which are underway. As of December 31, 2011, we
have an estimated liability accrued of $1.7 million for the study of the sediments and riverbank
groundwater and soils at the site. The estimate is at the low end of the range of potential liability
because no amount within the range is considered to be more likely than another and the high end of
the range cannot reasonably be estimated.

Oregon Steel Mills site. See “Other Legal Proceedings,” below.

Accrued Liabilities Relating to Environmental Sites. The following table summarizes the

accrued liabilities relating to environmental sites at December 31, 2011 and 2010:

Thousands
Gasco site
Siltronic site
Portland Harbor site
Central Service Center site
Front Street site
Other sites

Total

Current Liabilities

Non-Current Liabilities

2011
$16,510
887
1,089
-
1,697
-

$20,183

2010
$11,366
720
2,304
5
1
-

$14,396

2011
$44,697
128
7,066
495
-
120

$52,506

2010
$38,921
201
5,784
510
1,097
108

$46,621

Regulatory and Insurance Recovery for Environmental Costs. In May 2003, the OPUC

approved our request to defer unreimbursed environmental costs associated with certain named sites,
including those described above. Beginning in 2006, the OPUC granted us additional authorization to
accrue carrying costs on deferred environmental cost balances, subject to an annual demonstration that
we have maximized our insurance recovery or made substantial progress in securing insurance
recovery for unrecovered environmental expenses. Through a series of extensions, the authorized cost
deferral and carrying cost accrual was extended through January 2012. We have filed a request with
the OPUC to reauthorize this deferral and expect reauthorization during the first half of 2012. In
addition, we filed a request with the WUTC in January 2011 to defer certain environmental costs
associated with services provided to Washington customers. We received an order from the WUTC on
June 20, 2011 granting that request. Environmental costs related to Washington are being deferred as
of January 26, 2011 with cost recovery to be determined in a future proceeding.

On a cumulative basis, we have recognized a total of $124.8 million for environmental costs,
including legal, investigation, monitoring and remediation costs, including $4.9 million accrued and
paid prior to regulatory deferral order approval. At December 31, 2011, we had a regulatory asset of
$105.7 million for deferred environmental costs.

128

In December 2010, NW Natural commenced litigation against certain of its historical liability

insurers in Multnomah County Circuit Court, State of Oregon (see Item 3. Legal Proceedings). NW
Natural seeks damages in excess of $50 million in losses it has incurred to date, as well as declaratory
relief for additional losses it expects to incur in the future. In December 2011, NW Natural reached a
settlement with Associated Electric & Gas Insurance Services Limited and dismissed that insurer from
the litigation.

Other Legal Proceedings

We are subject to claims and litigation arising in the ordinary course of business. We do not

expect that the ultimate disposition of any of these matters, including the matter described below, will
have a material effect on our financial condition, results of operations or cash flows.

Oregon Steel Mills site. In 2004, NW Natural was served with a third-party complaint by the
Port of Portland (Port) in a Multnomah County Circuit Court case, Oregon Steel Mills, Inc. v. The Port
of Portland. The Port alleges that in the 1940s and 1950s petroleum wastes generated by our
predecessor, Portland Gas & Coke Company, and 10 other third-party defendants were disposed of in a
waste oil disposal facility operated by the United States or Shaver Transportation Company on
property then owned by the Port and now owned by Oregon Steel Mills. The complaint seeks
contribution for unspecified past remedial action costs incurred by the Port regarding the former waste
oil disposal facility as well as a declaratory judgment allocating liability for future remedial action
costs. No date has been set for trial. Although the final outcome of this proceeding cannot be predicted
with certainty, we do not expect that the ultimate disposition of this matter will have a material effect
on our financial condition, results of operations or cash flows.

129

NORTHWEST NATURAL GAS COMPANY
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Thousands, except per share amounts
2011
Operating revenues
Net operating revenues
Net income (loss)
Basic earnings (loss) per share
Diluted earnings (loss) per share

2010
Operating revenues
Net operating revenues
Net income (loss)
Basic earnings (loss) per share
Diluted earnings (loss) per share

Quarter ended

March 31

June 30

Sept. 30 Dec. 31

Total

$323,088
134,508
40,773
1.53
1.53

$161,197
67,232
2,193
0.08
0.08

$93,313
47,783
(8,312)
(0.31)
(0.31)

$271,198
119,910
29,244
1.09
1.09

$848,796
369,433
63,898

2.39 (1)
2.39 (1)

$286,529
130,926
43,608
1.64
1.64

$162,365
72,193
6,888
0.26
0.26

$95,067
46,211
(7,420)
(0.28)
(0.28)

$268,145
118,251
29,591
1.11
1.11

$812,106
367,581
72,667

2.73 (1)
2.73 (1)

(1)

Quarterly earnings (loss) per share are based upon the average number of common shares outstanding during each
quarter. Because the average number of shares outstanding has changed in each quarter shown, the sum of quarterly
earnings (loss) per share may not equal earnings per share for the year. Variations in earnings between quarterly
periods are due primarily to the seasonal nature of our business.

130

NORTHWEST NATURAL GAS COMPANY
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

COLUMN A

COLUMN B

COLUMN C

COLUMN D COLUMN E

Balance at
beginning
of
period

Additions

Deductions

Charged to
costs
and expenses

Charged to
other
accounts

Net
Write-offs

Balance
at end
of
period

Thousands (year ended Dec. 31)
2011
Reserves deducted in balance sheet from
assets to which they apply:

Allowance for uncollectible accounts

$2,950

$1,919

$-

$1,974

$2,895

2010
Reserves deducted in balance sheet from
assets to which they apply:

Allowance for uncollectible accounts

$3,125

$1,717

$-

$1,892

$2,950

2009
Reserves deducted in balance sheet from
assets to which they apply:

Allowance for uncollectible accounts

$2,927

$4,201

$-

$4,003

$3,125

131

Item 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING

AND FINANCIAL DISCLOSURE

None.

Item 9A.CONTROLS AND PROCEDURES

(a) Evaluation of Disclosure Controls and Procedures

Our management, under the supervision and with the participation of our Chief Executive Officer and
Chief Financial Officer, has completed an evaluation of the effectiveness of the design and operation of
our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities
Exchange Act of 1934, as amended (the “Exchange Act”)). Based upon this evaluation, our Chief
Executive Officer and Chief Financial Officer have concluded that, as of the end of the period covered
by this report, our disclosure controls and procedures were effective to ensure that information required
to be disclosed by us and included in our reports filed or submitted under the Exchange Act is
recorded, processed, summarized and reported within the time periods specified in the Securities and
Exchange Commission rules and forms and that such information is accumulated and communicated to
management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to
allow timely decisions regarding required disclosure.

(b) Changes in Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over
financial reporting, as such term is defined in the Exchange Act Rule 13a-15(f).

There have been no changes in our internal control over financial reporting that occurred during the
quarter ended December 31, 2011 that have materially affected, or are reasonably likely to materially
affect, our internal control over financial reporting. The statements contained in Exhibit 31.1 and
Exhibit 31.2 should be considered in light of, and read together with, the information set forth in this
Item 9(a).

Item 9B. OTHER INFORMATION

None.

132

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Information concerning our Board of Directors, its Committees and the Audit Committee

financial expert contained in NW Natural’s definitive Proxy Statement for the May 24, 2012 Annual
Meeting of Shareholders is hereby incorporated by reference. The information concerning “Section
16(a) Beneficial Ownership Reporting Compliance” and “Corporate Governance” contained in our
definitive Proxy Statement for the May 24, 2012 Annual Meeting of Shareholders is hereby
incorporated by reference.

Name

Dec. 31, 2011 Positions held during last five years

Age at

Gregg S. Kantor

David H. Anderson

Margaret D. Kirkpatrick

Lea Anne Doolittle

J. Keith White

David R. Williams

Grant M. Yoshihara

C. Alex Miller

Stephen P. Feltz

MardiLyn Saathoff

54

50

57

56

58

58

56

54

56

55

President and Chief Executive Officer (2009-

); President and Chief
Operating Officer (2007 - 2008); Executive Vice President (2006 -
2007); Senior Vice President, Public and Regulatory Affairs (2003-
2006).

Senior Vice President and Chief Financial Officer (2004-

).

Vice President and General Counsel (2005-
firm of Stoel Rives LLP (1991-2005).

); Partner in the law

Senior Vice President (2008-

); Vice President, Human Resources

(2000-2007).

Vice President, Business Development and Energy Supply/Chief

Strategic Officer (2007-
and Wholesale Services (2005-2006); Managing Director and Chief
Strategic Officer (2003-2005).

); Managing Director, Gas Operations

Vice President, Utility Services (2007-

); Director of Utility

Operations, Districts and managed Labor Relations (2004-2006).

Vice President, Utility Operations (2007-

); Managing Director,
Utility Services (2005-2006); Director, Utility Services (2004-
2005).

Vice President, Finance and Regulation (2009-

); Assistant

Treasurer (2008-
Affairs (2002-2009).

); General Manager of Rates and Regulatory

Assistant Secretary (2007-

); Treasurer and Controller (1999-

).

); Chief Governance Officer and

Deputy General Counsel (2010-
Corporate Secretary (2008-
Assistant General Counsel, Tektronix, Inc. (2005-2008); General
Counsel to Oregon Governor Kulongoski and Business and
Economic Development Advisor (2003-2005).

); Chief Compliance Officer and

David A. Weber

52

President and Chief Executive Officer, NW Natural Gas Storage, LLC

); Interim President and

and Gill Ranch Storage, LLC (2012 -
Chief Executive Officer, NW Natural Gas Storage LLC, and Gill
Ranch Storage, LLC (2011-2012); Chief Operating Officer NW
Natural Gas Storage, LLC and Gill Ranch Storage LLC (November
2010 - January 2011); Managing Director of Information Services
and Chief Information Officer (2005 - 2011); Director of
Information Services and Chief Information Officer (2001-2005).

133

Each executive officer serves successive annual terms; present terms end on May 24, 2012.

There are no family relationships among our executive officers, directors or any person chosen to
become one of our officers or directors.

NW Natural has adopted a Code of Ethics (Code) applicable to all employees and officers that

is available on our website at www.nwnatural.com. We intend to disclose on our website at
www.nwnatural.com any amendments to the Code or waivers of the Code for executive officers.

ITEM 11. EXECUTIVE COMPENSATION

The information concerning “Executive Compensation” and “Report of the Organization and

Executive Compensation Committee” contained in our definitive Proxy Statement for the May 24,
2012 Annual Meeting of Shareholders is hereby incorporated by reference. Information related to
Executive Officers as of December 31, 2011 is reflected in Part III, Item 10, above.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND

MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The following table sets forth information regarding compensation plans under which equity

securities of NW Natural are authorized for issuance as of December 31, 2011 (see Note 6 to the
Consolidated Financial Statements):

(a)

(b)

Number of securities
to be issued upon
exercise of
outstanding options,
warrants and rights

Weighted-average
exercise price of
outstanding options,
warrants and rights

(c)
Number of securities
remaining available for
future issuance under
equity compensation
plans (excluding
securities reflected in
column (a))

118,617
579,225
19,917

3,723

62,831

120,028

904,341

n/a
$42.09
$39.72

n/a

n/a

n/a

337,788
580,650
136,038

n/a

n/a

n/a

1,054,476

Plan Category

Equity compensation plans approved by

security holders:

Long-Term Incentive Plan (LTIP) (Target

Award) (1)

Restated Stock Option Plan
Employee Stock Purchase Plan

Equity compensation plans not approved by

security holders:

Executive Deferred Compensation Plan

(EDCP) (2)

Directors Deferred Compensation Plan

(DDCP) (2)

Deferred Compensation Plan for

Directors and Executives (DCP) (3)

Total

The information captioned “Beneficial Ownership of Common Stock by Directors and
Executive Officers” contained in our definitive Proxy Statement for the May 24, 2012 Annual Meeting
of Shareholders is incorporated herein by reference.

(1)

Shares issued pursuant to the LTIP do not include an exercise price, but are payable when the award criteria are
satisfied. If the maximum awards were paid pursuant to the performance-based awards outstanding at December 31,

134

(2)

(3)

2011, the number of shares shown in column (a) would increase by 118,617 shares and the number of shares shown in
column (c) would decrease by the same amount of shares.
Prior to January 1, 2005, deferred amounts were credited, at the participant’s election, to either a “cash account” or a
“stock account.” If deferred amounts were credited to stock accounts, such accounts were credited with a number of
shares of NW Natural common stock based on the purchase price of the common stock on the next purchase date under
our Dividend Reinvestment and Direct Stock Purchase Plan, and such accounts were credited with additional shares
based on the deemed reinvestment of dividends. Cash accounts are credited quarterly with interest at a rate equal to
Moody’s Average Corporate Bond Yield plus two percentage points, subject to a six percent minimum rate. At the
election of the participant, deferred balances in the stock accounts are payable after termination of Board service or
employment in a lump sum, in installments over a period not to exceed 10 years in the case of the DDCP, or 15 years in
the case of the EDCP, or in a combination of lump sum and installments. We have contributed common stock to the
trustee of the Umbrella Trusts such that the Umbrella Trusts hold approximately the number of shares of common stock
equal to the number of shares credited to all participants’ stock accounts.
Effective January 1, 2005, the EDCP and DDCP were closed to new participants and replaced with the DCP. The DCP
continues the basic provisions of the EDCP and DDCP under which deferred amounts are credited to either a “cash
account” or a “stock account.” Stock accounts represent a right to receive shares of NW Natural common stock on a
deferred basis, and such accounts are credited with additional shares based on the deemed reinvestment of dividends.
Effective January 1, 2007, cash accounts are credited quarterly with interest at a rate equal to Moody’s Average
Corporate Bond Yield. Our obligation to pay deferred compensation in accordance with the terms of the DCP will
generally become due on retirement, death, or other termination of service, and will be paid in a lump sum or in
installments of five or 10 years as elected by the participant in accordance with the terms of the DCP. We have
contributed common stock to the trustee of the Supplemental Trust such that this trust holds approximately the number of
common shares equal to the number of shares credited to all participants stock accounts. The right of each participant in
the DCP is that of a general, unsecured creditor of the Company.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR

INDEPENDENCE

The information captioned “Transactions with Related Persons” and “Corporate Governance”

in the Company’s definitive Proxy Statement for the May 24, 2012 Annual Meeting of Shareholders is
hereby incorporated by reference.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information captioned “2011 and 2010 Audit Firm Fees” in the Company’s definitive
Proxy Statement for the May 24, 2012 Annual Meeting of Shareholders is hereby incorporated by
reference.

135

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as part of this report:

1. A list of all Financial Statements and Supplemental Schedules is incorporated by

reference to Item 8.

2.

List of Exhibits filed:

Reference is made to the Exhibit Index commencing on page 138.

136

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the

registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly
authorized.

Date: February 28, 2012

NORTHWEST NATURAL GAS COMPANY

By:

/s/ Gregg S. Kantor

Gregg S. Kantor

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.

SIGNATURE

TITLE

DATE

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer
/s/ David H. Anderson
David H. Anderson
Senior Vice President
and Chief Financial Officer
/s/ Stephen P. Feltz
Stephen P. Feltz
Treasurer and Controller
/s/ Timothy P. Boyle
Timothy P. Boyle

/s/ Martha L. Byorum

Martha L. Byorum

/s/ John D. Carter

John D. Carter

/s/ Mark S. Dodson

Mark S. Dodson

/s/ C. Scott Gibson

C. Scott Gibson

/s/ Tod R. Hamachek
Tod R. Hamachek

/s/ Jane L. Peverett

Jane L. Peverett

/s/ George J. Puentes

George J. Puentes

/s/ Kenneth Thrasher

Kenneth Thrasher

/s/ Russell F. Tromley

Russell F. Tromley

Principal Executive Officer and Director

February 28, 2012

Principal Financial Officer

February 28, 2012

Principal Accounting Officer

February 28, 2012

Director

Director

Director

Director

Director

Director

Director

Director

Director

Director

137

)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)

February 28, 2012

NORTHWEST NATURAL GAS COMPANY

EXHIBIT INDEX
To
Annual Report on Form 10-K
For Fiscal Year Ended
December 31, 2011

Exhibit Number

Document

*3a.

*3b.

*4a.

*4b.

*4c.

*4d.

Restated Articles of Incorporation, as filed and effective May 31, 2006 and
amended June 3, 2008 (incorporated herein by reference to Exhibit 3a. to
Form 10-K for 2006, File No. 1-15973).

Bylaws as amended May 24, 2007 (incorporated herein by reference to
Exhibit 3.1 to Form 8-K dated May 29, 2007, File No. 1-15973).

Copy of Mortgage and Deed of Trust, dated as of July 1, 1946, to Bankers
Trust and R. G. Page (to whom Stanley Burg is now successor), Trustees
(incorporated herein by reference to Exhibit 7(j) in File No. 2-6494); and
copies of Supplemental Indentures Nos. 1 through 14 to the Mortgage and
Deed of Trust, dated respectively, as of June 1, 1949, March 1, 1954, April
1, 1956, February 1, 1959, July 1, 1961, January 1, 1964, March 1, 1966,
December 1, 1969, April 1, 1971, January 1, 1975, December 1, 1975, July
1, 1981, June 1, 1985 and November 1, 1985 (incorporated herein by
reference to Exhibit 4(d) in File No. 33-1929); Supplemental Indenture No.
15 to the Mortgage and Deed of Trust, dated as of July 1, 1986 (filed as
Exhibit 4(c) in File No. 33-24168); Supplemental Indentures Nos. 16, 17
and 18 to the Mortgage and Deed of Trust, dated, respectively, as of
November 1, 1988, October 1, 1989 and July 1, 1990 (incorporated herein
by reference to Exhibit 4(c) in File No. 33-40482); Supplemental Indenture
No. 19 to the Mortgage and Deed of Trust, dated as of June 1, 1991
(incorporated herein by reference to Exhibit 4(c) in File No. 33-64014); and
Supplemental Indenture No. 20 to the Mortgage and Deed of Trust, dated as
of June 1, 1993 (incorporated herein by reference to Exhibit 4(c) in File No.
33-53795).

Copy of Indenture, dated as of June 1, 1991, between the Company and
Bankers Trust Company, Trustee, relating to the Company’s Unsecured
Medium-Term Notes (incorporated herein by reference to Exhibit 4(e) in
File No. 33-64014).

Officers’ Certificate dated June 12, 1991 creating Series A of the
Company’s Unsecured Medium-Term Notes (incorporated herein by
reference to Exhibit 4e. to Form 10-K for 1993, File No. 0-994).

Officers’ Certificate dated June 18, 1993 creating Series B of the
Company’s Unsecured Medium-Term Notes (incorporated herein by
reference to Exhibit 4f. to Form 10-K for 1993, File No. 0-994).

138

Exhibit Number

Document

*4e.

*4f.

*4g.

*4h.

*4i.

*4j.

*4k.

*4l.

4m.

12

21

Officers’ Certificate dated January 17, 2003 relating to Series B of the
Company’s Unsecured Medium-Term Notes and supplementing the
Officers’ Certificate dated June 18, 1993 (incorporated herein by reference
to Exhibit 4f.(1) to Form 10-K for 2002, File No. 0-994).

Form of Credit Agreement between Northwest Natural Gas Company and
the banks that are party thereto, with JPMorgan Chase Bank, N.A., as
administrative agent and Bank of America, N.A., as syndication agent, dated
as of May 31, 2007, including Form of Note (incorporated herein by
reference to Exhibit 4 to Form 10-Q dated November 5, 2010, File No.
1-15973).

Form of Letter Agreement, between each of JPMorgan Chase Bank, N.A.,
Bank of America, N.A., U.S. Bank National Association, UBS Loan
Finance LLC, Wells Fargo Bank, N.A., Merrill Lynch Bank USA, dated as
of April 29, 2008, extending the Credit Agreement between Northwest
Natural Gas Company and each financial institution with JPMorgan Chase
Bank, N.A., as Administrative Agent (incorporated herein by reference to
Exhibit 4i.(1) to Form 10-K for 2008, File No. 1-15973).

Form of Secured Medium-Term Notes, Series B (incorporated herein by
reference to Exhibit 4.1 to Form 8-K dated October 4, 2004, File No.
1-15973).

Letter Agreement among the Company, JPMorgan Chase Bank, N.A., Bank
of America, N.A., U.S. Bank National Association, Wachovia Bank,
National Association, Wells Fargo Bank, N.A., Bank of America, N.A.,
Successor by merger to Merrill Lynch Bank USA, and UBS Loan Finance
LLC, dated October 29, 2009 (incorporated herein by reference to Exhibit
4i. to Form 10-K for 2009, File No. 1-15973).

Distribution Agreement, dated March 18, 2009, among Banc of America
Securities LLC, UBS Securities LLC, J.P. Morgan Securities Inc., and Piper
Jaffray and Co. (Incorporated herein by reference to Exhibit 1.1 to
Form 8-K dated March 23, 2009, File No. 1-15973).

Form of Letter Agreement, dated August 24, 2009, among Banc of America
Securities, LLC, UBS Securities LLC, J.P. Morgan Securities Inc., Piper
Jaffray & Co. and Wells Fargo Securities, LLC (incorporated herein by
reference to Exhibit 4k. to Form 10-K for 2009, File No. 1-15973).

Form of Unsecured Medium-Term Notes, Series B (incorporated herein by
reference to Exhibit 4.2 to Form 8-K dated October 4, 2004,
File No. 1-15973).

Gill Ranch Note Purchase Agreement, dated November 30, 2011, among
Gill Ranch Storage, LLC and the parties listed thereto.

Statement re computation of ratios of earnings to fixed charges.

Subsidiaries of Northwest Natural Gas Company.

139

Exhibit Number

Document

23

31.1

31.2

32.1

Consent of PricewaterhouseCoopers LLP.

Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/
15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/
15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of Principal Executive Officer and Principal Financial Officer
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Executive Compensation Plans and Arrangements:

*10b.

*10c.

*10d.

*10e.

*10f.

*10g.

*10h.

*10i.

*10j.

10k.

*10l.

Executive Supplemental Retirement Income Plan 2010 Restatement
(incorporated herein by reference to Exhibit 10b. to Form 10-K for 2009, File
No. 1-15973).

Supplemental Executive Retirement Plan, effective September 1, 2004
restated 2011 (incorporated herein by reference to Exhibit 10.1 to Form 10-Q
for the quarter ended September 30, 2011, File No. 1-15973).

Northwest Natural Gas Company Supplemental Trust, effective January 1,
2005, restated as of December 15, 2005 (incorporated herein by reference to
Exhibit 10.7 to Form 8-K dated December 16, 2005, File No. 1-15973).

Northwest Natural Gas Company Umbrella Trust for Directors, effective
January 1, 1991, restated as of December 15, 2005 (incorporated herein by
reference to Exhibit 10.5 to Form 8-K dated December 16, 2005, File No.
1-15973).

Northwest Natural Gas Company Umbrella Trust for Executives, effective
January 1, 1988, restated as of December 15, 2005 (incorporated herein by
reference to Exhibit 10.6 to Form 8-K dated December 16, 2005, File No.
1-15973).

Restated Stock Option Plan, as amended effective December 14, 2006
(incorporated herein by reference to Exhibit 10c. to Form 10-K for 2006, File
No. 1-15973).

Form of Restated Stock Option Plan Agreement (incorporated herein by
reference to Exhibit 10h. to Form 10-K for 2009, File No. 1-15973).

Executive Deferred Compensation Plan, effective as of January 1, 1987,
restated as of February 26, 2009 (incorporated herein by reference to Exhibit
10(e). to Form 10-K for 2008, File No. 1-15973).

Directors Deferred Compensation Plan, effective June 1, 1981, restated as of
February 26, 2009 (incorporated herein by reference to Exhibit 10(f). to Form
10-K for 2008, File No. 1-15973).

Deferred Compensation Plan for Directors and Executives effective January
1, 2005, restated as of January 1, 2012.

Form of Indemnity Agreement as entered into between the Company and each
director and certain executive officers (incorporated herein by reference to
Exhibit 10l. to Form 10-K for 2009, File No. 1-15973).

140

Exhibit Number

*10l.(1)

*10m.

10n.

*10o.

*10p.

*10q.

*10r.

10s.

10t.

10u.

10v.

*10w.

*10x.

*10y.

*10z.

Document

Form of Indemnity Agreement as entered into between the Company and
certain executive officers (incorporated herein by reference to Exhibit
10l.(1) to Form 10-K for 2009, File No. 1-15973).

Non-Employee Directors Stock Compensation Plan, as amended effective
December 15, 2005 (incorporated herein by reference to Exhibit 10.2 to
Form 8-K dated December 16, 2005, File No. 1-15973).

Executive Annual Incentive Plan, effective February 23, 2012.

Form of Agreement to Recoupment Provisions of Executive Annual
Incentive Plan, effective as of January 1, 2010 (incorporated herein by
reference to Exhibit 10o. to Form 10-K for 2009, File No. 1-15973).

Form of Change in Control Severance Agreement between the Company
and each executive officer (incorporated herein by reference to Exhibit 10o.
to Form 10-K for 2008, File No. 1-15973).

Severance agreement dated December 19, 2008 between the Company and
Gregg S. Kantor (incorporated herein by reference to Exhibit 10.1 to Form
8-K dated December 23, 2008, File No. 1-15973).

Northwest Natural Gas Company Long-Term Incentive Plan, as amended
and restated effective December 15, 2011 (incorporated herein by reference
to Exhibit 10.2 to Form 8-K dated December 14, 2011, File No. 1-15973).

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Restricted Stock Bonus Agreement under the Long-Term Incentive
Plan (incorporated herein by reference to Exhibit 10.9 to Form 8-K dated
December 16, 2005, File No. 1-15973).

Form of Consent dated December 14, 2006 entered into by each executive
officer (incorporated herein by reference to Exhibit 10.1 to Form 8-K dated
December 19, 2006, File No. 1-15973).

Consent to Amendment of Deferred Compensation Plan for Directors and
Executives, dated February 28, 2008 entered into by each executive officer
(incorporated herein by reference to Exhibit 10bb to Form 10-K for 2007,
File No. 1-15973).

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan relating to a special award to an executive officer
(incorporated herein by reference to Exhibit 10z. to Form 10-K for 2009,
File No. 1-15973).

141

Exhibit Number

Document

*10bb.

101.

Form of Restricted Stock Unit Award Agreement under the Long-Term
Incentive Plan (incorporated herein by reference to Exhibit 10.1 to
Form 8-K dated December 14, 2011, File No. 1-15973).

**The following materials from Northwest Natural Gas Company Annual
Report on Form 10-K for the fiscal year ended December 31, 2011,
formatted in Extensible Business Reporting Language (XBRL):

(i) Consolidated Statements of Income;
(ii) Consolidated Balance Sheets;
(iii) Consolidated Statements of Cash Flows; and
(iv) Related notes.

*
**

Incorporated herein by reference as indicated
In accordance with Rule 406T of Regulation S-T, the XBRL-related information in Exhibit 101 to this Annual Report on
Form 10-K is deemed not filed or part of a registration statement or prospectus for purposes of Section 11 or 12 of the
Securities Act, is deemed not filed for purposes of Section 18 of the Exchange Act and otherwise is not subject to
liability under these sections

142

NORTHWEST NATURAL GAS COMPANY
Ratio of Earnings to Fixed Charges
Thousands, except per share amount
(Unaudited)

EXHIBIT 12

Year Ended December 31,

2011

2010

2009

2008

2007

Fixed Charges, as defined:

Interest on Long-Term Debt . . . . . . . . . . . . . . . . .
Other Interest
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amortization of Debt Discount and Expense . . . .
Interest Portion of Rentals . . . . . . . . . . . . . . . . . .

$ 37,515
2,976
1,729
2,213

$ 39,198
1,587
1,766
2,130

$ 37,447
1,937
1,503
1,735

$ 33,605
4,022
700
1,551

$ 34,294
4,116
711
1,523

Total Fixed Charges, as defined . . . . . . . . . . . . . .

$ 44,433

$ 44,681

$ 42,622

$ 39,878

$ 40,644

Earnings, as defined:

Net Income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taxes on Income . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Charges, as above . . . . . . . . . . . . . . . . . . . .

$ 63,898
43,382
44,433

$ 72,667
49,462
44,681

$ 75,122
46,671
42,622

$ 69,525
40,678
39,878

$ 74,497
44,060
40,644

Total Earnings, as defined . . . . . . . . . . . . . . . . . .

$151,713

$166,810

$164,415

$150,081

$159,201

Ratio of Earnings to Fixed Charges . . . . . . . . . . . . . . .

3.41

3.73

3.86

3.76

3.92

Consent of Independent Registered Public Accounting Firm

EXHIBIT 23

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8
(Nos. 333-70218, 333-100885, 333-120955, 333-134973 and 333-139819) and in the Registration
Statement on Form S-3 (No. 333-171596) of Northwest Natural Gas Company of our report dated
February 28, 2012 relating to the consolidated financial statements, financial statement schedule and
the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Portland, Oregon
February 28, 2012

I, Gregg S. Kantor, certify that:

CERTIFICATION

EXHIBIT 31.1

I have reviewed this annual report on Form 10-K of Northwest Natural Gas Company;
1.
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;

4.

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;
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 28, 2012

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer

I, David H. Anderson, certify that:

CERTIFICATION

EXHIBIT 31.2

I have reviewed this annual report on Form 10-K of Northwest Natural Gas Company;
1.
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;

4.

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;
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 28, 2012

/s/ David H. Anderson
David H. Anderson
Senior Vice President and Chief Financial Officer

NORTHWEST NATURAL GAS COMPANY
Certificate Pursuant to Section 906
of Sarbanes – Oxley Act of 2002

EXHIBIT 32.1

Each of the undersigned, GREGG S. KANTOR, the President and Chief Executive Officer, and

DAVID H. ANDERSON, the Senior Vice President and Chief Financial Officer, of NORTHWEST
NATURAL GAS COMPANY (the Company), DOES HEREBY CERTIFY that:

1.

2.

The Company’s Annual Report on Form 10-K for the year ended December 31, 2011 (the Report)
fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of
1934, as amended; and

Information contained in the Report fairly presents, in all material respects, the financial condition
and results of operations of the Company.

IN WITNESS WHEREOF, each of the undersigned has caused this instrument to be executed

this 28th day of February 2012.

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer

/s/ David H. Anderson
David H. Anderson
Senior Vice President and
Chief Financial Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002
has been provided to Northwest Natural Gas Company and will be retained by Northwest Natural Gas
Company and furnished to the Securities and Exchange Commission or its staff upon request.

LIVING OUR MISSION & VALUES

NW Natural Community and Sustainability Report

Learn more about NW Natural’s community involvement and philanthropic contributions, environ-

mental stewardship, employee safety efforts and other company initiatives. 

View the Community & Sustainability Annual Report at nwnatural.com/aboutnwnatural/community.

NW Natural Energy-Effi  ciency Programs

NW Natural partners with Energy Trust of Oregon to offer our Oregon and Washington customers 

energy-efficiency programs and services. Learn more about the results of these programs and 

the benefits to our customers. 

View the Energy Trust of Oregon Annual Report at 

nwnatural.com/aboutnwnatural/environmentalstewardship.

NW Natural Low-Income Weatherization Program

NW Natural offers a program to our low-income customers designed to reduce their natural gas 

use through the installation of energy-efficient equipment and weatherization measures. Find out 

more about this innovative Oregon program. 

View the Low-Income Energy-Efficiency Program Annual Report at 

nwnatural.com/aboutnwnatural/environmentalstewardship.

Produced by NW Natural’s Corporate Communications

PHOTO CREDITS
Page 4 - Gregg Kantor and Paul O’Neal: Robbie McClaran, photographer. 

Page 6 - Mist facility: Corky Miller, photographer; Portland LNG: Bruce Beaton, photographer.

Page 7 - Drilling rig: Courtesy Encana Corporation.

Page 8 - NW Natural crew members: Corky Miller, photographer.

Page 9 - NW Natural Tualatin facility employees: Robbie McClaran, photographer.

Page 10 - Safety training (top): Corky Miller, photographer. 

Tualatin facility employee (bottom): Robbie McClaran, photographer.

Pages 18-19 - Corporate offi cers and board of directors: Robbie McClaran, photographer.

Page 21 - Robert Hess and Chu Lee: Robbie McClaran, photographer.

PRINTING

RR Donnelley

220 NW Second Avenue

Portland, Oregon 97209

nwnatural.com

NYSE: NWN

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K

(Mark One)
[X]

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2011
OR

[

]

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from

to
Commission file number 1-15973

NORTHWEST NATURAL GAS COMPANY
(Exact name of registrant as specified in its charter)

Oregon
(State or other jurisdiction of
incorporation or organization)

93-0256722
(I.R.S. Employer
Identification No.)

220 N.W. Second Avenue, Portland, Oregon 97209
(Address of principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (503) 226-4211

Securities registered pursuant to Section 12(b) of the Act:
Title of each class
Common Stock
Securities registered pursuant to Section 12(g) of the Act: None.

Name of each exchange on which registered
New York Stock Exchange

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

Act. Yes [ X ] No [

]

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

Act. Yes [

] No [ X ]

Indicate by check mark whether the registrant (1) has 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) has been subject to such filing requirements for the past 90 days. Yes [ X ] No [

]

Indicate by check mark whether the 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 (§232.405 of this
chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files). Yes [ X ] No [

]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405) is not

contained herein, and will not be contained, to the best of 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. [ X ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or

a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting
company” in Rule 12b-2 of the Exchange Act. (Check one):
Large Accelerated Filer [ X ]
Non-accelerated filer [

Accelerated Filer [
Smaller Reporting Company [

]

]

]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange

Act). Yes [

] No [ X ]

As of June 30, 2011, the registrant had 26,672,812 shares of its 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 non-affiliates was $1,189,774,420.

At February 24, 2012, 26,791,793 shares of the registrant’s Common Stock (the only class of Common Stock) were

outstanding.

Portions of the Proxy Statement of the registrant, to be filed in connection with the 2012 Annual Meeting of

Shareholders, are incorporated by reference in Part III.

DOCUMENTS INCORPORATED BY REFERENCE

NORTHWEST NATURAL GAS COMPANY
Annual Report to Securities and Exchange Commission
on Form 10-K
For the Fiscal Year Ended December 31, 2011
Table of Contents

PART I

Item 1.

Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forward-Looking Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Business . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Business Segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Gas Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Employees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additions to Infrastructure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Executive Officers of the Registrant
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Available Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 1A. Risk Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 1B. Unresolved Staff Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 2.
Legal Proceedings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 3.
Mine Safety Disclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 4.

PART II
Item 5.

Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer

Purchases of Equity Securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selected Financial Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 6.
Item 7.
Management’s Discussion and Analysis of Financial Condition and Results of Operations . . .
Item 7A. Quantitative and Qualitative Disclosures About Market Risk . . . . . . . . . . . . . . . . . . . . . . . . . . .
Financial Statements and Supplementary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 8.
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure . . .
Item 9.
Item 9A. Controls and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 9B. Other Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PART III
Item 10.
Item 11.
Item 12.

Item 13.
Item 14.

Directors, Executive Officers and Corporate Governance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Executive Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder

Matters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certain Relationships and Related Transactions, and Director Independence . . . . . . . . . . . . . .
Principal Accountant Fees and Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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GLOSSARY OF TERMS

Average weather: equal to the 25-year average
degree days based on temperatures established
in our last Oregon general rate case.

Bcf: one billion cubic feet, a volumetric measure
of natural gas, roughly equal to 10 million
therms or one trillion Btu’s.

Btu: British thermal unit, a basic unit of thermal
energy measurement. One Btu equals the energy
required to raise one pound of water one degree
Fahrenheit at atmospheric pressure and 60
degrees Fahrenheit. One hundred thousand Btu’s
equal one therm.

Core utility customers: residential, commercial
and industrial customers receiving firm service
from the utility.

Cost of gas sold: the delivered cost of natural
gas sold to customers, including the cost of gas
purchased or withdrawn/produced from storage
inventory or reserves, gains and losses from gas
commodity hedges, pipeline demand costs,
seasonal demand cost balancing adjustments,
regulatory gas cost deferrals and company gas
use.

Decoupling: a rate mechanism, also referred to
as our conservation tariff, which is designed to
break the link between earnings and the quantity
of natural gas consumed by customers. The
design is intended to allow the utility to
encourage customers to conserve energy while
not adversely affecting its earnings due to
reductions in sales volumes.

Degree days: units of measure that reflect
temperature-sensitive consumption of natural
gas, calculated by subtracting the average of a
day’s high and low temperatures from 65
degrees Fahrenheit.

Demand cost: a component in core utility
customer rates that covers the cost of securing
firm pipeline capacity to meet peak demand,
whether that capacity is used or not.

Firm service: natural gas service offered to
customers under contracts or rate schedules that
will not be disrupted to meet the needs of other
customers, particularly during cold weather.

General rate case: a periodic filing with state or
federal regulators to establish equitable rates and

balance the interests of all classes of customers
and our shareholders.

Interruptible service: natural gas service
offered to customers (usually large commercial
or industrial users) under contracts or rate
schedules that allow for interruptions when
necessary to meet the needs of firm service
customers.

Liquefied natural gas (LNG): the cryogenic
liquid form of natural gas. To reach a liquid
form at atmospheric pressure, natural gas must
be cooled to approximately -260 degrees
Fahrenheit.

Purchased gas adjustment (PGA): a regulatory
mechanism for adjusting customer rates to
reflect changes in the expected cost to acquire
and deliver natural gas supplies.

Return on equity (ROE): a measure of
corporate profitability, calculated as net income
divided by average common stock
equity. Authorized ROE refers to the equity rate
approved by a regulatory agency for utility
investments funded by common stock equity.

Sales service: service provided whereby a
customer purchases both natural gas commodity
supply and transportation from the utility.

Therm: the basic unit of natural gas
measurement, equal to 100,000 Btu’s.

Transportation service: service provided
whereby a customer purchases natural gas
commodity directly from a supplier but pays the
utility to transport the gas over its distribution
system to the customer’s facility.

Utility margin: utility gross revenues less the
associated cost of gas sold, including regulatory
adjustments and applicable revenue taxes. Also
referred to as utility net operating revenues.

Weather normalization: a rate mechanism
applied to residential and commercial
customers’ bills to adjust residential and
commercial customer billings based on
temperature variances from average weather,
with rate decreases when the weather is colder
than average and rate increases when the
weather is warmer than average.

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Forward-Looking Statements

This report contains “forward-looking statements” within the meaning of the U.S. Private
Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such
as “anticipates,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects” and similar references
to future periods. Examples of forward-looking statements include, but are not limited to statements
regarding the following:

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plans;
objectives;
goals;
strategies;
assumptions and estimates;
future events or performance;
trends;
cyclicality;
earnings and dividends;
growth;
customer rates;
commodity costs;
gas reserves;
operational performance and costs;
liquidity and financial positions;
project development and expansion;
competition;
procurement and development of new gas supplies;
estimated expenditures;
costs of compliance;
credit exposures;
potential efficiencies;
rate case;
impacts of laws, rules and regulations;
tax liabilities or refunds;
outcomes and effects of litigation, regulatory actions, and other administrative matters;
projected obligations under retirement plans;
adequacy of, and shift in mix of, gas supplies;
approval and adequacy of regulatory deferrals; and
environmental, regulatory, litigation and insurance costs and recoveries.

Forward-looking statements are based on our current expectations and assumptions regarding our

business, the economy and other future conditions. Because forward-looking statements relate to the
future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to
predict. Our actual results may differ materially from those contemplated by the forward-looking
statements. We therefore caution you against relying on any of these forward-looking statements. They
are neither statements of historical fact nor guarantees or assurances of future performance. Important
factors that could cause actual results to differ materially from those in the forward-looking statements
are discussed at Item 1A., “Risk Factors” of Part I and Item 7. and Item 7A., “Management’s Discussion
and Analysis of Financial Condition and Results of Operations” and “Quantitative and Qualitative
Disclosures About Market Risk,” respectively, of Part II of this report.

Any forward-looking statement made by us in this report speaks only as of the date on which it

is made. Factors or events that could cause our actual results to differ may emerge from time to time,
and it is not possible for us to predict all of them. We undertake no obligation to publicly update any
forward-looking statement, whether as a result of new information, future developments or otherwise,
except as may be required by law.

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NORTHWEST NATURAL GAS COMPANY
PART I

ITEM 1. BUSINESS

Overview

Northwest Natural Gas Company (NW Natural) was incorporated under the laws of Oregon in

1910. Our company and its predecessors have supplied gas service to the public since 1859, and we
have been doing business as NW Natural since 1997. We maintain operations in Oregon, Washington
and California and conduct businesses through NW Natural, its subsidiaries and joint ventures. A
reference to NW Natural (“we,” “us” or “our”) in this report means NW Natural and its subsidiaries
and joint ventures unless otherwise noted.

Business Segments

We operate in two primary reportable business segments, Local Gas Distribution and Gas
Storage. We also have other investments and business activities not specifically related to one of these
two reporting segments that we aggregate and report as Other.

Local Gas Distribution

We are principally engaged in the distribution of natural gas in Oregon and southwest
Washington. We refer to this business segment as our local gas distribution segment or utility. Our
local gas distribution segment involves building and maintaining a safe and reliable pipeline
distribution system, purchasing gas from producers and marketers, contracting for the transportation of
gas over pipelines from regional supply basins to our service territory, and reselling the gas to
customers subject to rates, terms and conditions approved by the Public Utility Commission of Oregon
(OPUC) or by the Washington Utilities and Transportation Commission (WUTC). Local gas
distribution also includes transporting gas owned by customers from an interstate pipeline connection,
or city gate, to the customers’ facilities for a fee, also approved by the OPUC or WUTC.
Approximately 90 percent of our consolidated assets and consolidated net income have been related to
the local gas distribution segment over the last few years. The OPUC has allocated to us as our
exclusive service area a major portion of western Oregon, including the Portland metropolitan area,
most of the Willamette Valley and the coastal area from Astoria to Coos Bay. We also hold certificates
from the WUTC granting us exclusive rights to serve portions of three southwest Washington counties
bordering the Columbia River. We provide gas service in 124 cities and neighboring communities in
15 Oregon counties, as well as in 16 cities and neighboring communities in three Washington
counties. The city of Portland is the principal retail and manufacturing center in the Columbia River
Basin, and is a major port for trade with Asia.

See Note 4 to the Consolidated Financial Statements for information on local gas distribution

assets and results of operations for the years ended December 31, 2011, 2010 and 2009.

Regulation and Rates

Our utility segment is subject to regulation with respect to, among other matters, rates and

systems of accounts by the OPUC, the WUTC, and Federal Energy Regulatory Commission (FERC).
The OPUC and WUTC also regulate NW Natural’s issuance of securities. In 2011, approximately 90
percent of our utility gas volumes were delivered to, and utility operating revenues were derived from,

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Oregon customers and the balance from Washington customers. The OPUC and the WUTC generally
require the natural gas commodity cost to be billed to customers at the same cost incurred or expected
to be incurred by the utility. We have not historically earned a profit or incurred a loss on gas
commodity purchases; however, in Oregon we have an incentive sharing provision whereby we can
either increase or decrease margin revenues from gas cost variances as compared to gas costs
embedded in the PGA. Under this provision, our net income is affected by differences between actual
and expected purchased gas costs, which occur primarily because of market fluctuations and volatility
affecting unhedged gas purchases. In addition, we recently entered into a regulatory agreement where
we receive a rate base return on our investment in gas reserves. See Part II, Item 7., “Results of
Operations—Regulatory Matters—Rate Mechanisms—Purchased Gas Adjustment and Results of
Operations—Regulatory Matters—Rate Mechanisms—Gas Reserves”.

We file general rate case and rate tariff requests periodically with the OPUC, WUTC and FERC

to change the rates we charge our utility and storage customers. On December 30, 2011, we filed an
application for a general rate increase at the OPUC. We requested an increase in authorized annual
Oregon jurisdictional revenues of $43.7 million, or 6.2 percent, with an overall rate of return on capital
of 8.28 percent, including a return on common equity of 10.3 percent, and an authorized equity to
capitalization ratio of 50 percent. We also requested the establishment of a rate mechanism through
which deferred costs related to our environmental liabilities will be recovered through rates. The new
rates are requested to be effective by November 1, 2012. We expect the OPUC to make a decision on
this rate case by the end of October 2012.

Our most recent general rate case in Washington was approved in December 2008, and new

rates were effective on January 1, 2009 (see Part II, Item 7., “Results of Operations—Regulatory
Matters—General Rate Cases,” below).

We are required under our Mist interstate storage certificate authority to file with FERC every

five years either a petition for rate approval or a cost and revenue study to change or justify
maintaining the existing rates for the interstate storage service. For further information, see Part II,
Item 7., “Results of Operations—Regulatory Matters,” and “Business Segments—Gas Storage,”
below.

Gas Supply

Our gas supply strategy is based on forecasted customer requirements, which considers

estimated load growth by type of customer, attrition, conservation, distribution system constraints,
interstate pipeline capacity and contractual limitations and the forecasted transfer of large customers
between sales service and transportation-only service. We perform sensitivity analyses based on factors
such as weather variations and price elasticity effects. We have a diverse portfolio of short-, medium-
and long-term firm gas supply contracts that are supplemented during periods of peak demand with gas
from storage facilities either owned by or contractually committed to us.

To achieve our gas supply strategy, we employ a gas purchasing strategy that emphasizes a
diversity of supply sources; a diverse portfolio of contract types and durations; strategic uses of gas
storage facilities and capacity recall agreements; a variety of gas cost management strategies; and
physical acquisition of gas supplies.

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We purchase our gas supplies at liquid trading points to facilitate competition and price
transparency. These trading points include the NOVA Inventory Transfer (NIT) point in Alberta (also
referred to as AECO), Huntingdon/Sumas and Station 2 in British Columbia, and multiple receipt
points in the U.S. Rocky Mountains.

Diversity of Supply Sources

We purchase natural gas for our core utility customers from three supply basins located

between western Canada and the U.S. Rocky Mountain areas. Currently, about 65 percent of our
supply comes from Canada, with the balance coming primarily from the U.S. Rocky Mountain
region. We believe that gas supplies available in the western United States and Canada are adequate to
serve our core utility requirements for the foreseeable future, but we continue to evaluate our long-term
supply mix based on projections of gas production and pricing in the U.S. Rocky Mountain regions as
well as other regions in North America. We believe that the cost of natural gas coming from western
Canada and the U.S. Rocky Mountain regions will continue to track the broader U.S. market prices.
Additionally, we expect increased availability of gas supplies throughout North America as a result of
the extraction of shale gas resources and the building of new transmission pipeline projects to increase
capacity out of the U.S. Rocky Mountain region.

Diverse Supply Portfolio of Contract Types and Durations

We maintain a diverse portfolio of short-, medium-, and long-term firm gas supply contracts.

We typically enter into gas purchase contracts for:

year-round baseload supply;
additional baseload supply for the winter heating season;

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•
• winter heating season contracts where we have the option to call on all or some of the

•

supplies on a daily basis; and
spot purchases, taking into account forecasted customer requirements, storage injections
and withdrawals and seasonal weather fluctuations.

At December 31, 2011, we have contracts with gas suppliers for deliveries ranging from three
months to four years, which provide for a maximum of 2.0 million therms of firm gas per day during
the winter heating season and 0.7 million therms per day year-round. These contracts have a variety of
pricing structures and purchase obligations. In addition, we have another 1.3 million therms per day of
firm gas supplies whereby we can purchase supplies for delivery to our system during the winter
heating season. During 2011, we purchased a total of 808 million therms of gas under contracts with
durations outlined in the chart below.

Contract Duration (primary term)

Percent of Purchases

Long-term (one year or longer)
Short-term (more than one month, less than one year)
Spot (one month or less)

Total

29
26
45

100

We typically renew or replace our gas supply contracts with new agreements from existing and

new suppliers. Aside from the asset management of our core utility gas supplies by the independent

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energy marketing company (see “Gas Cost Management Strategy—Asset management,” below), no
individual supplier generally provides more than 10 percent of our supply requirements. In 2011, one
supplier provided 11 percent of our supply requirements. Firm year-round supply contracts have
remaining terms ranging from one to four years. Currently, all firm gas supply contracts use price
formulas tied to monthly index prices.

In addition to our year-round contracts, we continue to contract in advance for firm gas supplies

to be delivered only during the winter heating season primarily under short-term contracts. During
2011, new short-term purchase contracts were entered into with 17 suppliers, which in addition to our
year- round contracts provide for a total of up to 2.0 million therms per day. We intend to enter into
new purchase contracts during 2012 for roughly the same volume of gas with existing or new
suppliers, as needed, to replace contracts that will expire in 2012.

We also buy gas on the spot market as needed to meet utility customer demand. We have
flexibility under the terms of some firm supply contracts, to purchase spot gas in lieu of the firm
contract volumes thereby allowing us to take advantage of more favorable pricing on the spot market
from time to time.

We continue to purchase a small amount of gas from a non-affiliated producer in the Mist gas

field in Oregon. The production area is situated near our underground gas storage facilities. Current
production supplies are less than 2 percent of our total annual purchase requirements. Production from
these wells varies as existing wells are depleted and new wells are drilled.

In 2011, we entered into an agreement with Encana Oil & Gas (USA) Inc. (Encana) to develop
physical gas reserves that are expected to supply a portion of our utility customers’ requirements over
the next 30 years. The volume of gas produced and allocated to us under the agreement will increase in
the early years as we continue to invest in drilling, with volumes expected to peak at about 13 percent
of our utility’s gas supply requirement in gas year 2015-2016. Over the first 10 years of the agreement
(2011-2020), volumes are expected to average approximately 8 to 10 percent of the annual gas
purchase requirements of our utility customers. In 2011, volumes from gas reserves were less than one
percent of our annual gas purchases.

Strategic Use of Gas Storage and Capacity Recall

We supplement our firm gas supply purchases with gas withdrawals from storage facilities we

own or that are contractually committed to us. Gas is generally purchased and injected into storage
during periods of low demand so that it can be withdrawn for use at a later time during periods of peak
demand. In addition to enabling us to meet our peak demand, these facilities make it possible to lower
the annual average cost of gas by allowing us to minimize our pipeline capacity demand costs and to
purchase gas for storage during the summer months when gas prices are generally lower.

Underground storage. A portion of our daily and seasonal peaking supplies to core utility

customers are from our underground gas storage facility in the Mist gas storage field. This facility has
a maximum daily deliverability of 5.2 million therms and a total working gas capacity of about 16 Bcf,
which includes the capacity reserved for core utility customers as well as the capacity used for
non-utility service. Under our regulatory agreement with the OPUC, non-utility gas storage at Mist can
be developed in advance of core utility customer needs, but it is subject to recall by the utility when
needed to serve utility customers as utility demand increases. Storage capacity recalled by the utility is

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added to utility rate base at net book value and tracked into utility rates in the annual PGA filing
immediately following the recall, so there is minimal regulatory lag in cost recovery. In May 2011, a
total of 100,000 therms per day of Mist storage capacity that had previously been available for
non-utility gas storage services was recalled and committed to use for core utility customers. There
was no Mist recall in 2010, but 100,000 therms per day were recalled in May 2009. The core utility
currently has 2.6 million therms per day of deliverability and approximately 9.5 Bcf of working gas
capacity available at the Mist storage facility.

We also have contracts with Northwest Pipeline (Northwest Pipeline), a subsidiary of The

Williams Companies, for firm gas storage from an underground facility at Jackson Prairie near
Chehalis, Washington, that provides us with daily firm deliverability of about 0.5 million therms and
total seasonal capacity of about 11.2 million therms. Separate contracts with Northwest Pipeline
provide for the transportation of these storage supplies to our service territory. All of these contracts
have reached the end of their primary terms, but we have exercised our renewal rights that allow for
annual extensions at our option.

We also contract for storage service in Alberta for amounts totaling just under 20 million

therms. This supply will displace equivalent volumes of spot purchases in Alberta as it uses the same
pipeline transportation for delivery from Alberta to our local gas distribution system. While this supply
helps manage price risks, it does not add to our total peak day resources.

LNG storage. We own and operate two LNG storage facilities in our Oregon service territory

that liquefy gas for storage during the summer months so that it is available for withdrawal during
periods of peak demand in the winter heating season. These two facilities provide a maximum
combined daily deliverability of 1.8 million therms and a total seasonal capacity of 16 million therms.
In addition, we have a contract for firm gas storage from an LNG facility in Plymouth, Washington,
which provides us with daily firm deliverability of about 0.6 million therms and total seasonal capacity
of about 4.8 million therms.

Capacity recall from transportation customers. We also have contracts with one electric
generator and two industrial customers that together provide 390,000 therms per day of recallable
pipeline capacity and supply.

Gas Cost Management Strategy

The cost of gas sold to core utility customers primarily consists of the purchase price paid to
suppliers (including the cost to acquire supplies in the form of gas reserves), charges paid to pipeline
companies to store and transport gas to our distribution system, and gains or losses related to gas
commodity hedge contracts entered into in connection with the purchase of gas for core utility
customers.

While volatility in natural gas commodity prices has ebbed and flowed over the last several

years due to a number of factors, recent success in new drilling technologies and substantial new
supplies from shale gas formations around the U.S. and Canada have resulted in increased North
American supplies of natural gas and lower gas prices. At the same time, pipeline transportation rates
charged by Canadian pipelines and U.S. interstate pipeline transportation service providers have been
relatively stable over the last several years, due in part to a 2006 rate case settlement for the U.S.
interstate pipelines. These rates periodically change when the Canadian pipelines and U.S. interstate

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pipelines file for rate change approval from the Canadian National Energy Board or FERC, as
applicable. Pipeline transportation rate increases or decreases are generally passed on to our customers
through annual PGA updates.

We engage in a number of strategies to mitigate the cost of gas sold to utility customers. Our

primary strategies for managing gas commodity price risk include:

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•

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negotiating fixed prices directly with gas suppliers;
negotiating financial derivative instruments that effectively convert the floating index price
in a physical gas supply contract to a fixed price (referred to as commodity price swaps);
negotiating financial derivative instruments that effectively set a ceiling or floor price, or
both, on a floating price physical supply contract (referred to as commodity price options
such as calls, puts, and collars);
buying gas and injecting it into storage;
buying a physical supply of gas reserves for longer term price stability; and
using an asset management service provider to produce revenues that reduce our utility’s
net cost of gas sold;

Fixed-price contracts. We negotiate fixed price contracts directly with gas suppliers for a
portion of our gas purchases. When we enter into these fixed-price contracts with our suppliers, the
price is typically set based on the prevailing index price plus or minus a spread based on the forward
price curve of natural gas at that time.

Financial derivative instruments. We hedge a majority of our firm year-round supply
contracts each year using financial derivative instruments as a key component of our gas purchasing
strategy. Our financial hedge contracts make up a majority of our commodity price hedging activity,
and these contracts are with a variety of investment-grade credit counterparties, typically with credit
ratings of AA- or higher. See Part II, Item 7A., “Quantitative and Qualitative Disclosures About
Market Risk—Credit Risk—Credit exposure to financial derivative counterparties.” Under our
financial hedge policy, we enter into commodity swaps, puts, calls and collars with terms generally
ranging anywhere from one month to five years.

Storage supplies. We seek to mitigate the effects of higher gas commodity prices and price

volatility on core utility customers by using our underground gas storage facilities, LNG facilities and
other methods of gas storage strategically in an attempt to manage the cost of gas commodity
purchases. We purchase and inject gas into storage during the summer months when demand and gas
prices are generally lower. About 19 percent of our annual gas supply requirements is stored for
withdrawal during the winter months in five different market-area storage facilities and one contract
for supply-basin storage. We are able to draw on these supplies during peak demand, thereby reducing
the need for higher-priced spot gas purchases.

Gas reserves. In addition to hedging gas prices with financial derivative instruments and gas

storage, we recently signed an agreement with Encana to acquire physical gas supplies to provide a
portion of our core utility customers’ requirements over 30 years. During the first 10 years of the
agreement, we believe the volumes of gas received under the Encana agreement will provide
approximately 8 to 10 percent of the average annual requirements of our utility customers.

Asset management. We use our gas supply, storage and transportation flexibility to capture
opportunities that emerge during the course of the year for gas purchases, sales, exchanges or other

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means to manage net gas costs. In particular, our Mist underground storage facility provides flexibility
in this regard. In addition to maximizing the value of our gas storage and pipeline capacity, we contract
with an independent energy marketing company that manages our unused capacity when those assets
are not serving the needs of our core utility customers. Our asset management provides cost savings
that reduces our utility’s cost of gas sold, and generates incremental revenues from a regulatory
incentive-sharing mechanism that are included in our gas storage business segment.

Gas Distribution Operations

The goals of our gas distribution operations for core utility customers are:

Safety—Building and maintaining a safe pipeline distribution system;

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• Reliability—Ensuring a gas resource portfolio that is sufficient to satisfy core utility

customer requirements under extremely cold weather conditions;

• Lowest reasonable cost—Applying strategies to acquire gas supplies at the lowest

reasonable cost for utility customers;

• Price stability—Making the best use of physical assets and financial instruments to manage

commodity price volatility; and

• Cost recovery—Managing gas purchase costs prudently to minimize the risks associated

with regulatory review and recovery of gas acquisition costs.

Safety

Safety and protection of our employees, our customers and the public at large is and will
remain a top priority. We monitor and maintain our pipeline distribution system and storage operations
with the goal of ensuring that natural gas is stored and delivered safely, reliably and efficiently. We
have had various system integrity programs since 2004 and currently have a program which integrates
the company’s bare steel replacement, transmission pipeline integrity management and distribution
pipeline integrity management programs into a single program. In response to the recent pipeline
incidents involving other companies, natural gas distribution businesses are likely to be subject to even
greater federal and state regulatory oversight of the safety of their operations. The “Pipeline Safety,
Regulatory Certainty, and Job Creation Act of 2011” signed into law in early 2012, requires several
new safety initiatives including an analysis of the appropriateness of automatic or remote shut-off
valves on new and replaced gas transmission lines, an evaluation of the benefits of expanding
transmission integrity management regulations to additional pipelines, requirements for operators to
reverify the maximum allowable operating pressures for transmission pipelines, and other
requirements. We intend to work diligently with industry associations and federal and state regulators
to comply with all new laws and regulations. We expect that costs associated with compliance with
federal, state and local rules would be recoverable in rates.

Reliability

The effectiveness of our gas distribution program ultimately rests on whether we provide
reliable service at a reasonable cost to our core utility customers. For this purpose, we develop a
composite design year and include a three day design peak event that is based on the most severe cold
weather experienced during the last 20 years in our service territory. We also assume that all usage by
interruptible customers will be curtailed on the design day. Our projected sources of delivery for design
day firm utility customer sendout total approximately 9.2 million therms. Of this total, we are currently

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capable of meeting nearly 60 percent of our maximum design day requirements with gas from storage
located within or adjacent to our service territory, while the remaining supply requirements would be
met by gas purchases under firm and recall gas purchase contracts. Optimal utilization of storage on
our design day reduces the cost and dependency on firm interstate pipeline transportation. On
January 5, 2004, we experienced our current record firm customer sendout of 7.2 million therms, and a
total sendout of 8.9 million therms, on a day that was approximately 9 degrees Fahrenheit warmer than
the design day temperature. That January 2004 cold weather event lasted about 10 days, and the actual
firm customer sendout each day provided data that confirmed our load forecasting models with little
re-calibration. Similar cold temperatures experienced in December 2008 and December 2009 produced
very high sendout days, but firm sendout in those years was still at least 3 percent below our 2004
record. Accordingly, we believe that our supplies would be sufficient to meet existing firm customer
demand if we were to experience maximum design day weather conditions. We will continue to
evaluate and update our forecasted requirements and incorporate changes in our integrated resource
plan (IRP) process (see further discussion of IRP below).

The following table shows the sources of supply that are projected to be used to satisfy the

design day sendout for the 2011-2012 winter heating season:

Projected Sources of Utility Supply for Design Day Sendout

Sources of Utility Supply

Firm supply purchases
Mist underground storage (utility only)
Company-owned LNG storage
Off-system firm storage contracts
Recall agreements

Total

Therms
(in millions)

Percent

3.3
2.6
1.8
1.1
0.4

9.2

36
28
20
12
4

100

The OPUC and WUTC have IRP processes in which utilities define different growth scenarios
and corresponding resource acquisition strategies in an effort to evaluate supply and demand resources,
consider uncertainties in the planning process and the need for flexibility to respond to changes, and
establish a plan for getting reliable service at the “least cost.”

In general, the IRP is filed biannually with both the OPUC and the WUTC. An annual update is

filed in Oregon in the off year. The OPUC acknowledges receipt of the IRP; whereas the WUTC
provides notice that our IRP met the requirements of the Washington Administrative
Code. Commission acknowledgment of the IRP does not constitute ratemaking approval of any
specific resource acquisition strategy or expenditure. However, the OPUC generally indicates that it
would give considerable weight in prudency reviews to utility actions that are consistent with
acknowledged plans. The WUTC has indicated that the IRP process is one factor it will consider in a
prudency review. We filed our 2011 IRP with Oregon in January 2011, and with Washington in March
2011. Subsequent to these filings, we filed a modified IRP in both states on September 1, 2011 to
address new assumptions about the schedule for the east segment of the Palomar pipeline (see Part II,
Item 7., “2012 Outlook-Strategic Opportunities-Pipeline Diversification,” below). The OPUC review
of our 2011 IRP filing is in process.

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Lowest Reasonable Cost

We apply cost management strategies, including fixed-price contracts, financial derivative

instruments, storage supplies, gas reserve purchases and asset management, in seeking to acquire gas
supplies at the lowest reasonable cost for utility customers (see “Gas Supply—Gas Cost Management
Strategy” above).

Price Stability

We use physical assets and financial instruments to manage commodity price volatility. Our

gas storage facilities make it possible to lower the annual average cost of gas by allowing us to
minimize our pipeline capacity demand costs and to purchase gas for storage during the summer
months when gas prices are generally lower. (See “Strategic Use of Gas Storage and Capacity Recall”
above). In addition, we recently signed an agreement with Encana to acquire physical gas supplies to
provide a portion of our core utility customers’ requirements over 30 years. During the first 10 years of
the agreement, we believe the volumes of gas received under the Encana agreement will provide
approximately 8-10 percent of the average annual requirements of our utility customers. (see “Diverse
Supply Portfolio of Contract Types and Durations” above). We also mitigate year-to-year commodity
price volatility through financial hedge contracts such as commodity price swaps and options. (see
“Gas Cost Management Strategy—Financial derivatives instruments” above and Part II, Item 7A.,
“Quantitative and Qualitative Disclosures About Market Risk—Credit Risk—Credit exposure to
financial derivative counterparties.”)

Cost Recovery

Mechanisms for gas cost recovery are designed to be fair and to balance the interests of our

customers and shareholders. In general, utility rates are designed to recover the cost of, but not earn a
return on, the gas commodity sold. We attempt to minimize risks associated with gas cost recovery
through:

•

•

•

re-setting customer rates annually for changes in forecasted gas costs and recovery of
customer deferrals of prior year’s actual versus forecasted gas costs (see Part II, Item 7.,
“Results of Operations—Regulatory Matters—Rate Mechanisms—Purchased Gas
Adjustment”);
aligning customer and shareholder interests, such as through the use of our PGA incentive
sharing mechanism, weather normalization, conservation, and gas storage sharing
mechanisms (see Part II, Item 7., “Results of Operations—Regulatory Matters”); and
periodic review of regulatory deferrals with state regulatory commissions and key customer
groups.

Customers

At year-end 2011, we had approximately 680,000 utility customers, consisting of

approximately 616,000 residential, 63,000 commercial and 1,000 industrial customers. Approximately
90 percent of our utility customers are located in Oregon, and 10 percent are located in
Washington. Industries we serve include: pulp, paper and other forest products; the manufacture of
electronic, electrochemical and electrometallurgical products; the processing of farm and food
products; the production of various mineral products; metal fabrication and casting; the production of
machine tools, machinery and textiles; the manufacture of asphalt, concrete and rubber; printing and
publishing; nurseries; government and educational institutions; and electric generation. No individual
customer or industry accounts for a significant portion of our utility revenues.

11

Competition and Marketing

Competition with Other Energy Products

We have no direct competition in our service area from other natural gas distributors. However,
for residential customers we compete primarily with electricity, fuel oil, propane and renewable energy
providers. We also compete with electricity, fuel oil and renewable energy for commercial
applications. In the industrial market, we compete with all forms of energy, including competition from
third-party sellers of natural gas commodity. Competition among energy suppliers is based on price,
efficiency, reliability, performance, market conditions, technology, legislative policy, and
environmental impact. Whether or not we provide the gas supplies to serve our transportation-eligible
customers, our net margins are not materially affected because we generally do not make any margin
on the commodity sold to our utility customers (see “Industrial Markets,” below and “Regulation and
Rates” above).

Residential and Commercial Markets

The relatively low market saturation of natural gas in residential single-family dwellings in our

service territory, estimated at less than 60 percent, and our operating convenience and environmental
advantage over fuel oil, provides the potential for continuing growth from residential and commercial
conversions. In 2011, the net increase in residential customers was 5,072 primarily from single- and
multi-family new construction, and from the conversion of existing homes from oil, electric and
propane. The net increase of all new customers added in 2011 was 5,546. This represents a 12-month
growth rate of 0.8 percent, which is down slightly from 2010 and well below historical growth rates
due to the slow economic recovery and weak job market.

On an annual basis, residential and commercial customers typically account for about 55 to 60
percent of our utility’s total volumes delivered and about 85 to 90 percent of gross operating revenues,
while industrial customers account for about 40 to 45 percent of volumes and about 10 percent of gross
operating revenues. The remaining gross operating revenues are derived from miscellaneous services
and other regulatory revenues.

Industrial Markets

Competition to serve the industrial and large commercial market in the Pacific Northwest has

been relatively unchanged since the early 1990s in terms of numbers and types of
competitors. Competitors consist of gas marketers, oil/propane sellers and electric utilities.

The OPUC and WUTC have approved transportation tariffs under which we may contract with
customers to deliver customer-owned gas. Transportation tariffs are priced at our sales service rate less
the commodity cost included in that rate. Therefore, our transportation margins (i.e. sales minus the
cost of gas sold) are generally unaffected financially if industrial customers buy commodity supplies
directly from producers or marketers rather than purchasing gas from us, as long as they remain on a
tariff or contract with the same level of service. Other than our incentive sharing arrangements and rate
base return on gas reserves, we do not generally make any margin on the sale of the gas
commodity. However, industrial customers may select between firm and interruptible service as well
as other levels of service, and these choices can positively or negatively affect margin. Firm service
schedules have a higher profit margin than interruptible service. The relative level and volatility of

12

prices in the natural gas commodity markets, along with the availability of pipeline capacity to ship
customer-owned gas, are among the primary factors that have caused some industrial customers to
alternate between sales and transportation service or between higher and lower levels of service. See
“Regulation and Rates” above for a full discussion on incentive sharing agreements.

Our industrial tariffs include terms which are intended to give us more certainty in the level of

gas supplies we will need to purchase in order to serve this customer group. The terms include an
annual election cycle period, special pricing provisions for out-of-cycle changes, and the requirement
that industrial customers on our annual weighted average PGA tariff must complete the agreed upon
term of their service before switching to a new service schedule. In the case of customers switching
out-of-cycle from transportation to sales service, the customer will be charged the incremental cost of
gas supply in accordance with our regulatory tariff.

We have designed custom transportation service agreements with several of our largest
industrial customers. These agreements are primarily designed to provide transportation rates that are
competitive with the customer’s alternative capital and operating costs of installing direct pipeline
connections to Northwest Pipeline’s interstate pipeline system, which would allow them to bypass our
local gas distribution system. These agreements generally prohibit bypass during their terms. Due to
the cost pressures that confront a number of our largest customers competing in global markets, bypass
continues to be a competitive threat. Although we do not expect a significant number of our large
customers to bypass our system in the foreseeable future, we may experience further deterioration of
margin associated with customers transferring to special contracts where pricing is specifically
designed to be competitive with their bypass alternative.

Transportation of Gas Supplies

Single transportation pipeline

Our local gas distribution system is reliant on a single, bi-directional interstate transmission
pipeline, to bring gas supplies into our distribution system. Although we are dependent on a single
pipeline, the pipeline’s gas flows into the Portland metropolitan market from two directions: (1) the
north, which brings supplies from the British Columbia and Alberta supply basins; and (2) the east,
which brings supplies from Alberta as well as the U.S. Rocky Mountain supply basins. In 2003 a
federal order requiring Northwest Pipeline to replace its 26-inch mainline from the Canadian border to
our service territory underscored the potential need for pipeline transportation diversity. That
replacement project was completed by Northwest Pipeline in November 2006. We are pursuing other
options to further diversify our pipeline transportation paths. Specifically, we are jointly developing
plans to build a pipeline (Palomar pipeline) that would connect TransCanada Pipelines Limited’s
(TransCanada) Gas Transmission Northwest (GTN) interstate transmission line to our local gas
distribution system. We entered into an agreement with GTN for the purpose of jointly developing,
owning and operating this proposed pipeline. Additionally, we entered into precedent agreements to
become a shipper on the Palomar pipeline. If constructed, this pipeline would provide another
transportation path for gas purchases from Alberta and the U.S. Rocky Mountains in addition to the
one that currently moves gas through the Northwest Pipeline system (See Part II, Item 7., “2012
Outlook—Strategic Opportunities—Pipeline Diversification”).

13

Pipeline transportation agreements

We incur monthly demand charges related to the following firm pipeline contracts. The largest

of our transportation agreements with Northwest Pipeline extends through September 2018 and
provides for firm transportation capacity of up to 2.1 million therms per day. This agreement provides
access to natural gas supplies in British Columbia and the U.S. Rocky Mountains.

Our second largest transportation agreement with Northwest Pipeline extends through
November 2016. It provides up to 1.0 million therms per day of firm transportation capacity from the
point of interconnection with Northwest Pipeline and GTN systems in eastern Oregon to our service
territory. GTN’s pipeline runs from the U.S./Canadian border through northern Idaho, southeastern
Washington and central Oregon to the California/Oregon border. We have firm long-term capacity on
GTN’s pipeline and two upstream pipelines in Canada, which match the amount of Northwest Pipeline
capacity northward into Alberta, Canada.

We also have an agreement with Northwest Pipeline that extends into 2044 for approximately

350,000 therms per day of firm transportation capacity from the U.S. Rocky Mountain
region. Additionally, in 2008 we executed an agreement with a third party to take assignment of their
firm transportation contract starting January 1, 2017, with the term extending through 2046. This
contract consists of 120,000 therms per day on Northwest Pipeline from the U.S. Rocky Mountain
region.

In addition, we have firm long-term pipeline transportation contracts with two other major

transporters located in Canada. One contract extends through October 2014 and provides
approximately 580,000 therms per day of firm gas transportation from Station 2 in northern British
Columbia to the Huntingdon/Sumas connection with Northwest Pipeline at the U.S./Canadian
border. Another contract extends through October 2020 and provides approximately 480,000 therms
per day of firm transportation from southeastern British Columbia to the same Huntingdon/Sumas
connection with Northwest Pipeline. Our capacity on this second contract is matched with companion
contracts for pipeline capacity on the TransCanada systems in British Columbia and Alberta, allowing
purchases to be made from the gas fields of Alberta, Canada.

Rates governing transportation of gas supplies

FERC establishes rates for interstate pipeline transportation service under long-term agreements

within the U.S., and Canadian authorities establish rates for service under agreements with the
Canadian pipelines over which we ship gas.

Gas Storage

Our gas storage segment primarily consists of two underground natural gas storage facilities,

including the non-utility portion of our Mist gas storage facility near Mist, Oregon and our 75 percent
ownership share of the Gill Ranch gas storage facility near Fresno, California. Because transmission
pipeline capacity and natural gas production are relatively constant over the course of a year compared
to the demand for natural gas, which fluctuates daily and seasonally, natural gas storage facilities are
needed to manage the flow and availability of gas supplies during periods of low demand so these
supplies can be stored and delivered into markets during periods of high demand. We capitalize on the
imbalance of supply and demand for natural gas by providing our gas storage customers with the

14

ability to store gas for resale or use in a higher value period. Our natural gas storage facilities allow us
to offer customers “multi-cycle” storage service, which permits them to inject and withdraw natural
gas multiple times a year, providing more flexibility to capture market opportunities. See Note 4 for
more information on gas storage assets and results of operations for the three years ended
December 31, 2011.

Regulation and Rates

Our gas storage segment is subject to regulation with respect to, among other matters, rates,

terms of services, and system of accounts established by the OPUC, WUTC and FERC with respect to
the Mist facilities, and by the California Public Utilities Commission (CPUC) with respect to Gill
Ranch. Gill Ranch has a tariff on file with the CPUC authorizing it to charge market-based rates for the
storage services offered. FERC has approved maximum cost-based rates under our Mist interstate
storage certificate, and at least every five years we are required to file with FERC either a petition for
rate approval or a cost and revenue study to change or justify maintaining the existing rates for the
interstate storage service. For further information, See Part II, Item 7., “results of Operations—
Regulatory Matters,” below.

Facilities

Mist Storage Facility. We provide gas storage services to customers in the interstate and

intrastate markets from our Mist gas storage facilities located in Columbia County, Oregon, near the
town of Mist. The Mist field was converted to storage operations for our core local gas distribution
customers. Since 2001, we have made gas storage capacity at Mist available to interstate customers by
developing new incremental capacity in advance of core utility customer requirements to meet the
demands for interstate storage service. These interstate storage services are offered under a limited
jurisdiction blanket certificate issued by FERC. In addition, since 2005 we have offered firm storage
services in Oregon under an OPUC-approved rate schedule as an optional service to eligible
non-residential utility customers. Currently, the Mist facilities consist of seven depleted natural gas
reservoirs with a combined working gas capacity of approximately 16 Bcf, a combined deliverability
of approximately 0.5 Bcf per day, a central compression facility, gathering pipelines and other related
facilities.

In addition to earning revenue from storage contracts, we also contract with an independent
energy marketing company to provide asset management services using our utility and non-utility
storage and transportation capacity, the results of which are included in the gas storage business
segment. Pre-tax income from gas storage at Mist and third-party management services using our
utility’s storage or transportation capacity is subject to revenue sharing with core utility customers. In
Oregon, 80 percent of the pre-tax income is retained by the gas storage segment when the costs of the
capacity used have not been included in utility rates, and 33 percent of the pre-tax income is retained
when the capacity costs have been included in utility rates. The remaining 20 percent and 67 percent of
pre-tax income in each case are credited to a deferred regulatory account for refund to core utility
customers. We have a similar sharing mechanism in Washington for pre-tax income derived from gas
storage services and third-party asset management activities.

Gill Ranch Storage Facility. Gill Ranch Storage, LLC (Gill Ranch), our subsidiary, has a joint
project agreement with Pacific Gas and Electric Company (PG&E) to develop and own the Gill Ranch
underground natural gas storage facility near Fresno, California. Currently, Gill Ranch owns a 75
percent undivided interest in this facility and is the sole operator of the facility. The Gill Ranch facility
began operations in the fourth quarter of 2010.

15

The Gill Ranch facility currently consists of three depleted natural gas reservoirs, twelve

injection and withdrawal wells, a compressor station, dehydration and control equipment, gathering
lines, an electric substation, a natural gas transmission pipeline extending 27 miles from the storage
field to an interconnection with the PG&E transmission system, and other related facilities. Gill Ranch
owns the rights to 75 percent of the available storage capacity at the facility. Gill Ranch’s share is
designed to provide 15 Bcf of working gas capacity, which we expect to be in full use by the end of
2012.

Gill Ranch is offering storage services to the California market at market-based rates, subject to
regulation by the CPUC for certain activities including, but not limited to, service terms and operating
conditions.

Assets. The following table highlights certain important design information about the

Company’s non-utility gas storage assets.

Mist Storage (1)
Gill Ranch Storage

Storage
Capacity (Bcf)

Withdrawal
(MMcf/day) (3)

Injection
(MMcf/day) (3)

6
15 (2)

258
488

103
240

(1) Approximately 6 Bcf of a total 16 Bcf at Mist is currently available to our gas storage segment. The remaining 10 Bcf is
used to provide gas storage for our local distribution business and its utility customers. All storage capacity and daily
deliverability currently developed for the gas storage segment at Mist is available for recall by the utility.

(2) Our share of the Gill Ranch facility is currently designed to provide 15 Bcf out of a total of 20 Bcf.
(3) Our share of the expected daily maximum injection and withdrawal rates.

Gas Storage Operations

Asset management. With respect to the Mist gas storage facility, we contract with an
independent energy marketing company to provide asset management services for our utility pipeline
transportation contracts, our utility gas supplies and our unused utility and non-utility storage assets,
primarily through the use of commodity transactions and pipeline capacity release transactions (see
“Facilities—Mist Gas Storage Facility,” above). Similarly, we contract with an independent energy
marketing company to manage the value of our unused storage assets at the Gill Ranch gas storage
facility (see “Facilities—Gill Ranch Gas Storage Facility,” above). The results of asset management
services at both facilities are included in the gas storage business segment, except for amounts
allocated to our utility pursuant to regulatory sharing agreements involving the use of utility assets.

Seasonality of business. Generally, Mist gas storage revenues do not follow seasonal patterns

similar to those experienced by the utility because most of the storage capacity is contracted with
customers for firm service, and rates for firm service are primarily in the form of fixed monthly
reservation charges and not affected by customer usage. However, there is seasonal variation from the
management of available surplus storage capacity and related transportation capacity. Temporary
surplus capacity is quite often available during the spring and summer months when the demand for
gas by utility customers is low.

Although we expect much of the storage revenue at Gill Ranch to be in the form of fixed
monthly demand charges, total cash flows from the Gill Ranch storage facility could be more seasonal

16

in nature than the Mist storage facility. A significant portion of operating costs at Gill Ranch is related
to compression. Because compression is used primarily for the injection of gas rather than for
withdrawal, we expect power costs to be incurred disproportionately during the injection season.

Gas storage customers. For our Mist interstate storage services, firm service agreements with
customers are entered into with terms typically ranging from 1 to 10 years. Currently, our gas storage
revenues from Mist are derived primarily from firm storage service customers who provide energy
related services, including natural gas production or distribution, electric generation and energy
marketing. Three storage customers currently account for over 90 percent of our existing non-utility
gas storage capacity at Mist, with the largest customer accounting for about half of total
capacity. These three customers have contracts that expire at various dates through April 2017.

Customer contracts for firm storage capacity at Gill Ranch are as long as 28 years in duration,
but we expect Gill Ranch in the early years of operation to contract for terms mostly ranging from one
to five years due to current market conditions. Gill Ranch currently has several storage customers, with
the largest single contract accounting for approximately 13 percent of the facility’s design capacity.
The California market served by Gill Ranch is larger, and has a greater diversity of prospective
customers, than the Pacific Northwest market served by Mist. As such, we expect there to be less
sensitivity to any single customer or group of customers for capacity at Gill Ranch. Current Gill Ranch
customers provide energy related services, including natural gas production, marketing and electric
generation.

Competitive conditions. Our Mist gas storage facility benefits from limited competition from

other Pacific Northwest storage facilities primarily because of its geographic location. However,
competition from other storage providers in the Pacific Northwest region and Canada, as well as
competition for interstate pipeline capacity, does exist. In the future, we could face increased
competition from new or expanded gas storage facilities as well as from new natural gas pipelines,
marketers and alternative energy sources.

The Gill Ranch storage facility competes with a number of other storage providers, including

local integrated gas companies and other independent storage operators in the northern California
market. There is also ongoing expansions and proposed new construction of storage capacity in
northern California that could increase competition for Gill Ranch.

Interstate gas storage. The Mist gas storage facility currently provides firm and interruptible

gas storage services with related transportation services on the utility’s system to and from Mist to
interstate pipeline interconnections in order to serve customers in interstate commerce. The interstate
storage services, and maximum rates for these services, are authorized and regulated by the FERC. The
storage capacity used by this business segment has been developed as a non-utility investment by NW
Natural in advance of core utility customers’ requirements.

Gill Ranch storage facility is not currently authorized to provide interstate gas storage services.

Intrastate gas storage. The Mist gas storage facility provides intrastate gas storage services in

Oregon under an OPUC-approved rate schedule that includes service eligibility and site-specific
qualifications. The firm storage service rates, terms and conditions mirror our firm interstate storage
service regulated by FERC, except that these customers are located and served in Oregon.

17

Gill Ranch provides intrastate storage services in California at market-based rates under a

CPUC-approved tariff that includes firm storage service, interruptible storage service and park and
loan storage services.

Storage Expansions.

Mist Storage Facility. While the Pacific Northwest storage markets have been negatively
impacted by lower gas prices and lack of price volatility, albeit less so than in California, we continue
to plan for future expansion at Mist. We believe the earliest timeframe for completing the next
expansion is 2016. In the meantime, we expect to continue working on preliminary design and project
scope, which will likely include the development of storage wells, potentially a second compression
station, and additional pipeline gathering facilities that would enable more storage expansions in the
future.

Gill Ranch Storage Facility. Subject to market demand, project execution, available financing,

receipt of future permits, and other rights, Gill Ranch can be expanded beyond the current combined
permitted capacity of 20 Bcf without further expansion of the takeaway pipeline system. Taking these
considerations into account and with certain infrastructure modifications, we currently estimate that the
Gill Ranch storage facility could support an aggregate storage capacity of at least 40 Bcf, of which Gill
Ranch would have the rights to an aggregate of 20 Bcf or 50 percent of total estimated storage
capacity.

Other

We have non-utility investments and other business activities which are aggregated and
reported as a business segment called “Other.” Although in the aggregate these investments and
activities are not material, we identify and report them as a stand-alone segment because these
investments and activities are not specifically related to our utility or gas storage segments. This
segment primarily consists of: an equity method investment in a joint venture to build and operate a
gas transmission pipeline in Oregon (see Part II, Item 7., “2012 Outlook—Strategic Opportunities—
Pipeline Diversification,” below); a minority interest in other pipeline assets held by our wholly-owned
subsidiary NNG Financial; and other operating and non-operating expenses of the parent company that
are not included in utility or gas storage operations. Less than 1 percent of our consolidated assets and
consolidated net income are related to activities in the “Other” business segment. This pipeline is
regulated by FERC. See Note 4 for summary information on this Other segment’s assets and results of
operations for the three years ended December 31, 2011.

Environmental Issues

Properties and Facilities

We have properties and facilities that are subject to federal, state and local laws and regulations

related to environmental matters. These laws and regulations may require expenditures over a long
timeframe to address certain environmental impacts. Estimates of liabilities for environmental response
costs are difficult to determine with precision because of the various factors that can affect their
ultimate disposition. These factors include, but are not limited to, the following:

•
•
•

the complexity of the site;
changes in environmental laws and regulations at the federal, state and local levels;
the number of regulatory agencies or other parties involved;

18

•

•
•
•

new technology that renders previous technology obsolete, or experience with existing
technology that proves ineffective;
the ultimate selection of a particular technology;
the level of remediation required; and
variations between the estimated and actual period of time that must be dedicated to
respond to an environmentally-contaminated site.

We own, or previously owned, properties currently being investigated that may require

environmental response. Based on our current assessment of regulatory and insurance recovery of
environmental costs, we do not expect that the ultimate resolution of these matters will have a material
adverse effect on our financial condition, results of operations or cash flows; however, if it is
determined that both the insurance recovery and future rate recovery of such costs are not probable,
then the costs not expected to be recovered will be charged to expense in the period such determination
is made and could have a material impact on our financial condition or results of operations. See Note
15 for a further discussion of potential environmental responses, related costs and regulatory and
insurance recovery.

Greenhouse Gas Issues

We recognize that our businesses are likely to be impacted by carbon constraints. A variety of

legislative and regulatory measures to address greenhouse gas emissions are in various phases of
discussion or implementation. These include proposed international standards, proposed federal
legislation, proposed or enacted federal regulations, and proposed or enacted state actions to develop
statewide or regional programs, each of which has imposed or would impose measures to achieve
reductions in greenhouse gas emissions. For example, in December 2009, the EPA published its
findings that concentrations of carbon dioxide, methane and other greenhouse gases present an
endangerment to human health and the environment as drivers of climate change, and that emissions
from motor vehicles contribute to that threat. Based on these findings by the EPA, the agency
proceeded with the adoption and implementation of regulations to regulate emissions of greenhouse
gas starting in January 2011 from new motor vehicles and from stationary sources of air pollution such
as power plants and oil refineries. One of these new regulations, which the EPA refers to as the
“Tailoring Rule,” requires that permits held by larger sources of air pollution address greenhouse
gases, and also requires additional permitting and implementation of best available control technology
for limiting greenhouse gas emissions at certain new facilities and at existing facilities when they
implement modifications that increase emissions of greenhouse gas above threshold levels. Lawsuits
have been filed challenging the EPA’s regulation of greenhouse gas emissions, and members of the
U.S. Congress have discussed proposing legislation that would limit the EPA’s ability to regulate
greenhouse gas emissions.

In September 2009, the EPA issued a final rule requiring the annual reporting of greenhouse
gas emissions from certain industries, specified large greenhouse gas emission sources, and facilities
that emit 25,000 metric tons or more of CO2 equivalents per year. The first reports were due on
March 31, 2011 for emissions occurring on or after January 1, 2010. Under this reporting rule, local
gas distribution companies like NW Natural are required to report system throughput to the EPA on an
annual basis. The EPA also issued additional greenhouse gas reporting regulations requiring the annual
reporting of fugitive emissions from our operations. The first report under these more recent
regulations is due by March 31, 2012.

The outcome of these and other international, federal and state climate change initiatives cannot

be determined at this time, but these initiatives could produce a number of results including potential

19

new regulations, legal actions, additional charges to fund energy efficiency activities, or other
regulatory actions. The adoption and implementation of any regulations limiting emissions of
greenhouse gas from our operations could require us to incur costs to reduce emissions of greenhouse
gas associated with our operations, which could result in an increase in the prices we charge our
customers or a decline in the demand for natural gas. On the other hand, because natural gas is a fossil
fuel with relatively low carbon content, it is also possible that future carbon constraints could create
additional demand for natural gas for electric generation, direct use of natural gas in homes and
businesses, and as a reliable and relatively low-emission back-up fuel source for alternative energy
sources. Requirements to reduce greenhouse gas emissions from the transportation sector, such as
those in Oregon’s low carbon fuel standard passed in 2009, could also result in additional demand for
natural gas for use in vehicles.

We continue to take steps to address future greenhouse gas emission issues, including actively

participating in policy development through participation on various Oregon taskforces and, at the
federal level, within the American Gas Association. We continue to engage in policy development and
in identifying ways to reduce greenhouse gas emissions associated with our operations and our
customers’ gas use, including offering the Smart Energy program, which allows customers to
voluntarily contribute funds to projects such as biodigesters on dairy farms that offset the greenhouse
gases produced from their natural gas use.

Employees

At December 31, 2011, the utility workforce consisted of 598 members of the Office and

Professional Employees International Union (OPEIU) Local No. 11, AFL-CIO, and 452 non-union
employees. Our labor agreement with members of OPEIU that covers wages, benefits and working
conditions extends to May 31, 2014, and thereafter from year to year unless either party serves notice
of its intent to negotiate modifications to the collective bargaining agreement.

At December 31, 2011, our subsidiaries had a combined workforce of 21 non-union employees.

Our subsidiaries receive certain services from centralized operations at the utility, and as such the
utility is reimbursed for those services pursuant to a Shared Services Agreement.

Additions to Infrastructure

We make capital expenditures in order to maintain and enhance the safety and integrity of our

pipelines, terminals, storage facilities and related assets, to expand the reach or capacity of those assets,
or improve the efficiency of our operations to pursue new business opportunities. We expect to make a
significant level of capital expenditures for additions to utility and gas storage infrastructure over the
next five years, reflecting continued investments in customer growth, technology, distribution system
improvements and gas storage facilities. In 2012, utility capital expenditures are estimated to be
between $145 and $160 million, and non-utility capital investments are estimated to be between $10
and $15 million. For the five-year period ending in 2016, capital expenditures for the utility are
estimated to be between $400 and $500 million, while the amount for gas storage and other
investments after 2012 will depend largely on future decisions about potential expansion opportunities
in gas storage and pipeline projects.

Executive Officers of the Registrant

For information concerning our executive officers, see Part III, Item 10.

20

Available Information

We file annual, quarterly and special reports and other information with the Securities and
Exchange Commission (SEC). Reports, proxy statements and other information filed by us can be read
and copied at the Public Reference Room of the SEC, 100 F Street, N.E., Washington, D.C. 20549.
You can obtain additional information about the Public Reference Room by calling the SEC at
1-800-SEC-0330. The SEC also maintains a website (http://www.sec.gov) that contains reports, proxy
and information statements and other information that we file electronically. In addition, we make
available on our website (http://www.nwnatural.com), our annual report on Form 10-K, quarterly
reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished
pursuant to Section 13(a) or 15(d) and proxy materials filed under Section 14 of the Securities
Exchange Act of 1934, as amended (Exchange Act), as soon as reasonably practicable after we
electronically file such material with, or furnish it to, the SEC.

We have adopted a Code of Ethics for all employees and officers that is available on our
website. We intend to disclose amendments to, and any waivers from the Code of Ethics on our
website. Our Corporate Governance Standards, Director Independence Standards, charters of each of
the committees of the Board of Directors and additional information about us are also available at the
website. Copies of these documents may be requested, at no cost, by writing or calling Shareholder
Services, NW Natural, One Pacific Square, 220 N.W. Second Avenue, Portland, Oregon 97209,
telephone 503-226-4211 ext. 3412.

ITEM 1A. RISK FACTORS

Our business and financial results are subject to a number of risks and uncertainties, many of

which are not within our control. When considering any investment in our securities, investors should
carefully consider the following information, as well as information contained in the caption “Forward-
Looking Statements,” Item 7A., and other documents we file with the SEC. This list is not exhaustive
and the order of presentation does not reflect management’s determination of priority or likelihood.
Additionally, our listing of risk factors that primarily affect one of our business segments does not
indicate that such risk factor is inapplicable to our other business segments.

Risks Related to our Business Generally

Regulatory risk. Regulation of our businesses, including changes in the regulatory

environment in general, and failure of regulatory authorities to approve rates which provide for timely
recovery of our costs and an adequate return on invested capital in particular, or an unfavorable
outcome in ratemaking proceedings may adversely impact our financial condition and results of
operations.

The OPUC and WUTC have general regulatory authority over our utility business in Oregon
and Washington, respectively, including the rates charged to customers, authorized rates of return on
capital invested, the amounts and types of securities we may issue, services we provide, facilities we
own or operate, terms of customer services, system of accounts, the nature of investments we may
make, safety standards, deferral and recovery of various expenses, including, but not limited to,
pipeline replacement and environmental remediation costs, transactions with affiliated interests,
actions investors may take with respect to our company and other matters. Similarly, in our gas storage
business FERC has regulatory authority over interstate storage services, and the CPUC has regulatory
authority over our Gill Ranch storage operations.

21

The prices that the OPUC and WUTC allow us to charge for retail service, and the tariff rate
that the Federal Energy Regulatory Commission permits us to charge for transmission, are the most
significant factors affecting our financial position, results of operations and liquidity. The OPUC and
WUTC have the authority to disallow recovery of any costs they consider unreasonable or imprudently
incurred, and the rates allowed by the FERC may be insufficient for recovery of costs incurred. For
example, we expect to continue to make expenditures to expand, improve and operate our utility
distribution and gas storage systems. Regulators can deny such expansions or improvements or
recovery of expenditures we make if they find that such expenditures were not prudently incurred
according to their regulatory standards. Additionally, while the OPUC and WUTC have established
through the ratemaking process an authorized rate of return for our utility, the regulatory process does
not provide assurance that we will be able to achieve the earnings level authorized.

Moreover, in the normal course of business we may place assets in service or incur higher than

expected levels of operating expense before rate cases can be filed to recover those costs—this is
commonly referred to as “regulatory lag.” The failure of any regulatory commission to approve
requested rate increases on a timely basis to recover increased costs or to allow an adequate return
could adversely impact our financial condition and results of operations.

We filed a general rate case in Oregon on December 30, 2011. While the OPUC is required to

establish rates that are fair, just and reasonable, they have significant discretion in applying this
standard. The ratemaking process typically involves multiple parties, including governmental agencies,
consumer advocacy groups, and others who are impacted by the use of natural gas. Each party has
differing concerns, but all generally have the same common objective of limiting rate increases or even
reducing rates. Our rate case proposes to establish rates based on forecasted operating and capital
expenditures that rely on many assumptions concerning future conditions and operating results. In the
ratemaking process, regulators and interveners can challenge these assumptions and may assert
different assumptions or apply different interpretations to the data. We cannot predict the ultimate
outcome of any ratemaking proceeding, including the extent to which certain costs, such as significant
capital projects, are recoverable; what rates of return will be allowed; and whether, or in what form,
our regulatory mechanisms, such as our weather normalization mechanism or conservation tariff, will
be renewed. Additionally, we may agree to conditions as part of a settlement or regulatory proceeding,
or there may be determinations made in regulatory investigations, that reduce our earnings and
liquidity, all of which could adversely affect our results of operations and financial condition.

Economic risk. Changes in the economy and in the financial markets may have a negative

impact on our financial condition and results of operations.

Changes in economic activity in our markets and in global financial markets can result in a

decline in or sustained lower levels of energy consumption, which could have a negative effect on our
financial condition and results of operations. In recent years, the U.S. and world economies have
slowed, credit markets have tightened, unemployment rates and mortgage defaults have risen, and the
value of homes and other personal as well as business investments have declined, which has adversely
affected the income and financial resources of many domestic households and businesses. It is unclear
whether the federal responses, as well as international, to these conditions will lessen the severity or
duration of this economic downturn, or could possibly trigger inflationary conditions. Our operations
and financial results are affected by these economic conditions. Less new housing construction, fewer
conversions to natural gas, fewer customer additions, higher levels of residential foreclosures and
vacancies, tighter lending restrictions, higher levels of personal and business bankruptcies or reduced

22

spending could all result in a decline in or sustained lower levels of energy consumption and customer
growth, a slowing of collections from our customers, and higher levels of delinquent accounts
receivable and bad debts, all of which could have a negative effect on our financial condition and
results of operations.

Environmental liability risk. Certain of our properties and facilities may pose environmental
risks requiring remediation, the cost of which could adversely affect our financial condition, results of
operations and cash flows.

We own, or previously owned, properties that require environmental remediation or other

action. We accrue all material loss contingencies relating to these properties. A regulatory asset at the
utility has already been recorded for estimated costs pursuant to a deferral order from the OPUC and
WUTC. To the extent we are unable to recover these deferred costs in utility customer rates or through
insurance, we would be required to reduce our regulatory asset which would result in a charge to
current year earnings. In addition, disputes may arise between potentially responsible parties and
regulators as to the severity of particular environmental matters and what remediation efforts are
appropriate.

We cannot predict with certainty the amount or timing of future expenditures related to

environmental investigation and remediation that may be required, or disputes arising in relation
thereto or the outcomes of those disputes, because of the difficulty of estimating such costs. There is
also uncertainty in quantifying liabilities under environmental laws that impose joint and several
liabilities on all potentially responsible parties. This uncertainty and disputes arising therefrom could
lead to adversarial administrative proceedings or litigation, with associated costs and uncertain
outcomes, all of which could adversely affect our financial condition, results of operations and cash
flows.

Business development risk. The development, construction, startup and operation of our
business development projects may involve unanticipated changes or delays that could negatively
impact our costs as well as our financial condition, results of operations and cash flows.

Business development projects involve many risks. We are currently engaged in several
business development projects, including, but not limited to, the early planning and development stage
on the Palomar gas transmission pipeline in Oregon. We may also engage in other business
development projects in the future, including expansion of our gas storage facilities at Mist or Gill
Ranch, or the investment in additional long-term gas reserves. With respect to these projects, we may
not be able to obtain required governmental permits and approvals, or financing, to complete our
projects in a cost-efficient or timely manner. If we do not obtain the necessary regulatory approvals in
a timely manner, development projects may be delayed or abandoned. There also may be startup and
construction delays, construction cost overruns, inability to negotiate acceptable agreements such as
rights-of-way, easements, construction, gas supply or other material contracts, changes in customer
demand or commitment, public opposition to projects, changes in market prices, and operating cost
increases. Additionally, natural gas storage and transportation markets are highly competitive, both
within the natural gas industry and with alternative sources of energy. To fund our business
development projects, we will need to secure financing from willing investors at reasonable costs. We
may be unable to finance our business development projects at acceptable interest rates or within a
scheduled timeframe for completing the project. One or more of these events could result in the project
becoming impaired, and such impairment could have an adverse effect on our financial condition and
results of operations.

23

Joint partner risk. Investing in business development projects through partnerships, joint

ventures or other business arrangements affects our ability to manage certain risks and could
adversely impact our financial condition, results of operations and cash flows.

We use joint ventures and other business arrangements to manage and diversify the risks of

certain utility and non-utility development projects, including Palomar pipeline, Gill Ranch storage and
Encana gas reserves. Also, we may acquire or develop part-ownership interests in other similar
projects in the future. Under these types of business arrangements, we may not be able to fully direct
the management and policies of the business relationships, and other participants in those relationships
may take action contrary to our interests including making operational decisions that could affect our
costs and liabilities related to a project. In addition, other participants may withdraw from the project,
become financially distressed or bankrupt, or have economic or other business interests or goals that
are inconsistent with ours. With respect to our gas reserves venture, the drilling of new wells for gas
may not produce the expected volumes of gas, or any gas. Additionally, environmental regulations may
require operational improvements to mitigate potential environmental damage, increasing operating
costs to us. Although we have contractual and other legal remedies to mitigate these risks and enforce
our interests, dry wells, increased operational costs, or a participant in one of these business
arrangements acting contrary to our interests, it could adversely impact the project as well as our
financial condition, results of operations and cash flows.

Global climate change risk. Future legislation may impose carbon constraints to address

global climate change, exposing us to regulatory and financial risk. Additionally, certain properties
and facilities may be subject to physical risks associated with climate change.

There are a number of new international, federal and state legislative and regulatory initiatives

being proposed and adopted in an attempt to measure, control or limit the effects of global warming
and overall climate change, including greenhouse gas emissions such as carbon dioxide. The adoption
of current or future proposed legislation by the U.S. Congress or similar legislation by states, or the
adoption of related regulations by federal or state regulatory bodies such as the EPA, imposing
reporting obligations on, or limiting emissions of greenhouse gases from our equipment or operations
could have far-reaching and significant impacts on our business as well as the broader energy
industry. Such current or future legislation or regulation could also impose on us operational
requirements or restrictions or additional charges to fund energy efficiency initiatives. Such initiatives
could result in us incurring additional costs to comply with the imposed restrictions, provide a cost
advantage to energy sources other than natural gas, reduce demand for natural gas, impose costs or
restrictions on end users of natural gas, impact the prices we charge our customers, impose on us
increased costs associated with the adoption of new infrastructure and technology to respond to such
requirements, and may impact cultural perception of our service or products negatively, diminishing
the value of our brand, all of which could adversely affect our business practices, financial condition
and results of operations.

Climate change may cause physical risks, including an increase in sea level, intensified storms,

water scarcity and changes in weather conditions, such as changes in precipitation, average
temperatures and extreme wind or other climate conditions. A significant portion of the nation’s gas
infrastructure is located in areas susceptible to storm damage that could be aggravated by wetland and
barrier island erosion, which could give rise to gas supply interruptions and price spikes.

These and other physical changes could result in changes in customer demand, increased costs
associated with repairing and maintaining distribution systems resulting in increased maintenance and

24

capital costs, increased financing needs, limits on our ability to meet peak customer demand, increased
regulatory oversight, and lower customer satisfaction. Also, to the extent that climate change adversely
impacts the economic health of our region, it may adversely impact customer demand and
revenues. Such physical risks could have an adverse effect on our financial condition, results of
operations, and cash flows.

Operating risk. Transporting and storing natural gas involves numerous risks that may result

in accidents and other operating risks and costs, some or all of which may not be fully covered by
insurance, and which could adversely affect our financial condition, results of operations and cash
flows.

Our operations are subject to all of the risks and hazards inherent in the businesses of local gas

distribution and storage, including:

•
•

•

•
•

•

earthquakes, floods, storms, landslides and other adverse weather conditions and hazards;
leaks or other losses of natural gas or other hydrocarbons as a result of the malfunction of
equipment or facilities;
damages from third parties, including construction, farm and utility equipment or other
surface users;
operator errors;
negative unpredicted performance by our storage reservoirs that could cause us to fail to
meet expected or forecasted operational levels or contractual commitments to our
customers;
problems maintaining, or the malfunction of, pipelines, wellbores and related equipment
and facilities that form a part of the infrastructure that is critical to the operation of our gas
distribution and storage facilities;
collapse of underground storage caverns;

•
• migration of natural gas through faults in the rock or to some area of the reservoir where

•

•

existing wells cannot drain the gas effectively;
blowouts (uncontrolled escapes of gas from a pipeline or well) or other accidents, fires and
explosions; and
risks and hazards inherent in the drilling operations associated with the development of the
gas storage facilities and/or wells.

These risks could result in personal injury or loss of human life, damage to and destruction of

property and equipment, pollution or other environmental damage, breaches of our contractual
commitments, and may result in curtailment or suspension of our operations, which in turn could lead
to significant costs and lost revenues. Further, because our pipeline, storage and distribution facilities
are in or near populated areas, including residential areas, commercial business centers, and industrial
sites, any loss of human life or adverse financial outcome resulting from such events could be
significant. Natural gas that moves outside of the effective drainage area through migration could be
permanently lost and would need to be replaced. Additionally, we may not be able to obtain the level
or types of insurance we desire, and the insurance coverage we do obtain may contain large deductibles
or fail to cover certain hazards or cover all potential losses. The occurrence of any operating risks not
covered by insurance could adversely affect our financial condition, results of operations and cash
flows.

25

Business continuity risk. We may be adversely impacted by local or national disasters,

pandemic illness, terrorist activities and other extreme events to which we may not able to promptly
respond.

Local or national disasters, pandemic illness, terrorist activities and other extreme events are a

threat to our assets and operations. Companies in our industry may face a heightened risk due to
exposure to acts of terrorism that could target or impact our natural gas distribution, transmission or
storage facilities and result in a disruption in our operations and ability to meet customer
requirements. In addition, the threat of terrorist activities could lead to increased economic instability
and volatility in the price of natural gas that could affect our operations. Threatened or actual national
disasters or terrorist activities may also disrupt capital markets and our ability to raise capital, or
impact our suppliers or our customers directly. Local disaster or pandemic illness could result in part of
our workforce being unable to operate or maintain our infrastructure or perform other tasks necessary
to conduct our business. We maintain emergency planning and training programs to remain ready to
respond to events that could cause business interruption. However, a slow or inadequate response to
events may have an adverse impact on operations and earnings. We may not be able to obtain
sufficient insurance to cover all risks associated with local and national disasters, pandemic illness,
terrorist activities and other events, which could increase the risk that an event could adversely affect
our operations or financial results.

Employee benefit risk. The cost of providing pension and postretirement healthcare benefits is

subject to changes in pension assets and liabilities, changing employee demographics and changing
actuarial assumptions, which may have an adverse effect on our financial condition, results of
operations and cash flows.

We provide pension plans and postretirement healthcare benefits to most eligible full-time
employees and retirees. Our cost of providing such benefits is subject to changes in the market value of
our pension assets, changes in employee demographics including longer life expectancies, increases in
healthcare costs, current and future legislative changes including but not limited to the Health Care
Reform Act in 2010, and various actuarial calculations and assumptions. The actuarial assumptions
used to calculate our future pension and postretirement healthcare expense may differ materially from
actual results due to significant market fluctuations and changing withdrawal rates, wage rates, interest
rates and other factors. These differences may result in an adverse impact on the amount of pension
contributions, pension expense or other postretirement benefit costs recorded in future
periods. Sustained declines in equity markets and reductions in bond rates may have a material adverse
effect on the value of our pension fund assets. In these circumstances, we may be required to recognize
increased contributions and pension expense earlier than we had planned to the extent that the value of
pension assets is less than the total anticipated liability under the plans, which could have a negative
impact on financial condition, results of operations and cash flows.

Workforce risk. Our business is heavily dependent on being able to attract and retain
qualified employees and maintain a competitive cost structure with market-based salaries and
employee benefits, and workforce disruptions could adversely affect our operations and results.

Our ability to implement business strategy and serve our customers is dependent upon our

continuing ability to attract and retain talented professionals and a technically skilled workforce, and
being able to transfer the knowledge and expertise of our workforce to new employees as our aging
employees retire. Without an appropriately skilled workforce, our ability to provide quality service and

26

meet our regulatory requirements will be challenged and this could negatively impact our
earnings. Additionally, within our utility segment a majority of our workers are represented by the
Office and Professional Employees International Union Local No.11 AFL-CIO (the Union), and are
covered by a collective bargaining agreement that extends to May 31, 2014. Disputes with the Union
over terms and conditions of the agreement could result in instability in our labor relationship and work
stoppages that could impact the timely delivery of gas and other services from our utility and Mist gas
storage, which could strain relationships with customers and state regulators and cause a loss of
revenues. Our collective bargaining agreement may also increase the cost of employing our Union
workforce, affect our ability to continue offering market-based salaries and employee benefits, limit
our flexibility in dealing with our workforce, and limit our ability to change work rules and practices
and implement other efficiency-related improvements to successfully compete in today’s challenging
marketplace, which may negatively affect our financial condition and results of operations.

Legislative and taxing authority risk. We are subject to governmental regulation, and
compliance with local, state and federal requirements, including taxing requirements, and unforeseen
changes in or interpretations of such requirements could affect our financial condition and results of
operations.

We are subject to regulation by federal, state and local governmental authorities. We are
required to comply with a variety of laws and regulations and to obtain authorizations, permits,
approvals and certificates from governmental agencies in various aspects of our business. We cannot
predict with certainty the impact of any future revisions or changes in interpretations of existing
regulations or the adoption of new laws and regulations applicable to them. Changes in regulations or
the imposition of additional regulations could negatively influence our operating environment and
results of operations.

Additionally, changes in federal, state or local tax laws and their related regulations, or
differing interpretation or enforcement of applicable law by a federal, state or local taxing authority,
could result in substantial cost to us and negatively affect our results of operations. Tax law and its
related regulations and case law are inherently complex and dynamic. Disputes over interpretations of
tax laws may be settled with the taxing authority in examination, upon appeal or through litigation. Our
judgments may include reserves for potential adverse outcomes regarding tax positions that have been
taken that may be subject to challenge by taxing authorities. Changes in laws, regulations or adverse
judgments may negatively affect our financial condition and results of operations.

Environmental regulation risk. We are subject to environmental regulations which could

adversely affect our operations or financial results.

We are subject to laws, regulations and other legal requirements enacted or adopted by federal,
state and local governmental authorities relating to protection of the environment and health and safety
matters, including those legal requirements that govern discharges of substances into the air and water,
the management and disposal of hazardous substances and waste, the clean-up of contaminated sites,
groundwater quality and availability, plant and wildlife protection, as well as work practices related to
employee health and safety. Revised environmental regulations which result in increased compliance
costs or additional operating restrictions could have an adverse effect on our financial condition and
results of operations, particularly if those costs are not fully recoverable from insurance or through
utility customer rates.

27

Environmental legislation also requires that our facilities, sites and other properties associated
with our operations be operated, maintained, abandoned and reclaimed to the satisfaction of applicable
regulatory authorities. Failure to comply with these laws, regulations, permits and licenses may expose
us to fines, penalties or interruptions in our operations that could adversely affect our financial results.

Safety regulation risk. We may experience increased federal, state and local regulation of the
safety of our systems and operations, which could adversely affect our operating costs and financial
results.

The safety and protection of the public, our customers and our employees is and will remain

our top priority. We are committed to consistently monitoring and maintaining our distribution system
and storage operations to ensure that natural gas is acquired, stored and delivered safely, reliably and
efficiently. However, we anticipate companies in the natural gas distribution business may be subjected
to even greater federal, state and local regulatory oversight over the safety of their operations. We
intend to work diligently with industry associations and federal and state regulators to ensure
compliance with the new laws, such as the “Pipeline Safety, Regulatory Certainty, and Job Creation
Act of 2011” signed into law in early 2012. Although we believe these costs will ultimately be
recoverable through our rates to customers, the costs of complying with such increased regulation
could have at least a short-term negative impact on our operating costs and financial results.

Hedging risk. Our risk management policies and hedging activities cannot eliminate the risk of

commodity price movements and other financial market risks, and our hedging activities may expose
us to additional liabilities for which rate recovery may be disallowed, which could result in an adverse
impact on our operating revenues, costs, derivative assets and liabilities and operating cash flows.

In our utility segment, our gas purchasing requirements expose us to risks of commodity price
movements, while our use of debt and equity financing exposes us to interest rate, liquidity and other
financial market risks. We attempt to manage these exposures and mitigate our risks through adherence
to established risk limits and risk management procedures, including hedging activities that are in
accordance with our policy guidelines. We use both financial and physical hedging mechanisms,
including our recent gas reserve transaction in which we are acquiring long-term gas reserves through
an investment with Encana Oil & Gas (USA). These risk limits and risk management procedures may
not always work as planned and cannot entirely eliminate the risks associated with
hedging. Additionally, our hedging activities may cause us to incur additional expenses which could
adversely impact our financial condition, results of operations, and cash flows.

We do not hedge our entire interest rate or commodity cost exposure, and the unhedged
exposure will vary over time. Gains or losses experienced through hedging activities, including
carrying costs, generally flow through the PGA mechanism or are recovered in future general rate
cases, thereby limiting our exposure to earnings volatility on a year-to-year basis. However, the hedge
transactions we enter into for the utility are subject to a prudency review by the OPUC and WUTC,
and, if deemed imprudent, those expenses may be disallowed, which could have an adverse effect on
our financial condition and results of operations. In addition, actual business requirements and
available resources may vary from forecasts, which are used as the basis for our hedging decisions, and
could cause our exposure to be more or less than we anticipated. Moreover, if our derivative
instruments and hedging transactions do not qualify for hedge accounting under generally accepted
accounting standards, our hedges may not be effective and our results of operations and financial
condition could be adversely affected.

28

We also have credit-related exposure to derivative counterparties. In general, we require our

counterparties to have an investment-grade credit rating at the time the derivative instrument is entered
into, and we specify limits on the contract amount and duration based on each counterparty’s credit
rating. Nevertheless, counterparties owing us money or physical natural gas commodities could breach
their obligations. Should the counterparties to these arrangements fail to perform, we may be forced to
enter into alternative arrangements to meet our normal business requirements. In that event, our
financial results could be adversely affected. Although our valuations take into account the expected
probability of default and the potential loss due to a default by our counterparties, an actual default by
a particular counterparty could have a greater impact than we estimate. Additionally, under most of our
hedging arrangements, any downgrade of our senior unsecured long-term debt credit rating could allow
our counterparties to require us to post cash, a letter of credit or other form of collateral, which would
expose us to additional costs and may trigger significant increases in borrowing from our credit
facilities if the credit rating downgrade is below investment grade.

Inability to access capital market risk. Our inability to access capital, or significant
increases in the cost of capital, could adversely affect our financial condition and results of operations.

Our ability to obtain adequate and cost effective short-term and long-term financing depends on

maintaining investment grade credit ratings as well as the existence of liquid and stable financial
markets. Our businesses rely on access to capital markets, including commercial paper, bond and
equity markets, to finance our operations, construction expenditures and other business requirements,
and to refund maturing debt that cannot be funded entirely by internal cash flows. Disruptions in the
capital markets could adversely affect our ability to access short-term and long-term financing. Our
access to funds under committed short-term credit facilities, which are currently provided by a number
of banks, is dependent on the ability of the participating banks to meet their funding
commitments. Those banks may not be able to meet their funding commitments if they experience
shortages of capital and liquidity. Disruptions in the bank or capital financing markets as a result of
economic uncertainty, changing or increased regulation of the financial sector, or failure of major
financial institutions could adversely affect our access to capital and negatively impact our ability to
run our business and make strategic investments.

A negative change in our current credit ratings, particularly below investment grade, could
adversely affect our cost of borrowing and access to sources of liquidity and capital. Such a downgrade
could further limit our access to borrowing under available credit lines. Additionally, downgrades in
our current credit ratings below investment grade could cause additional delays in accessing the capital
markets by the utility while we seek supplemental state regulatory approval, which could hamper our
ability to access credit markets on a timely basis. A credit downgrade could also require additional
support in the form of letters of credit, cash or other forms of collateral and otherwise adversely affect
our financial condition and results of operations.

Changes in accounting standards. Changes in accounting standards may adversely impact

our financial condition and results of operations.

Our business is currently subject to accounting standards issued by the Financial Accounting

Standards Board. Changes in these standards could adversely impact our financial condition or results
of operations. Recently, the SEC has been considering whether issuers in the United States should be
required to prepare financial statements in accordance with International Financial Reporting Standards
(IFRS) instead of the current generally accepted accounting principles (GAAP) in the United States.

29

IFRS is a comprehensive set of accounting standards promulgated by the International Accounting
Standards Board (IASB), which are currently in effect for most other countries in the world. If the SEC
decides to adopt IFRS, we expect that U.S. companies would not be required to report under these new
standards until 2015 or 2016 at the earliest. Unlike U.S. GAAP, IFRS does not currently provide an
industry accounting standard for rate-regulated activities. As such, if IFRS were adopted in its current
state, we may be precluded from applying certain regulatory accounting principles, including the
recognition of certain regulatory assets and regulatory liabilities. The potential issues associated with
rate-regulated accounting, along with other potential changes associated with the adoption of IFRS,
may have a significant impact on our financial condition and results of operations. Also, the U.S.
Financial Accounting Standards Board is considering several changes to U.S. GAAP, some of which
may be significant, as part of a joint effort with the IASB to converge accounting standards over the
next several years. If approved, adoption of these changes may adversely impact our financial
condition and results of operations.

Risks Related Primarily to Our Local Utility Business

Gas price risk. Higher natural gas commodity prices and volatility in the price of gas may

adversely affect our results of operations and cash flows.

The cost of natural gas is affected by a variety of factors, including weather, changes in
demand, the level of production and availability of natural gas supplies, imports and exports of natural
gas, transportation constraints, availability of pipeline capacity, transportation capacity cost increases,
federal and state energy and environmental regulation and legislation, the degree of market liquidity,
supply disruption, natural disasters, wars and other catastrophic events, national and worldwide
economic and political conditions, and the price and availability of alternative fuels. In our utility
segment, the cost we pay for natural gas at the utility is generally passed through to our customers
through an annual PGA rate adjustment. Recent years have seen a substantial decline in natural gas
prices as new drilling technologies have been employed to produce abundant U.S. supplies of natural
gas. If this trend in commodity prices were to reverse and thereby result in significant increases in the
commodity price of natural gas, it would raise the cost of energy to our utility customers, potentially
causing those customers to conserve or switch to alternate sources of energy. Significant price
increases could also cause new home builders and commercial developers to select heating systems
other than natural gas. Decreases in the volume of gas we sell could reduce our earnings in the absence
of decoupled rate structures, and a decline in customers could slow growth in our future earnings.

Higher gas prices may also cause us to experience an increase in short-term debt and

temporarily reduce liquidity because we pay suppliers for gas when it is purchased, which can be
several months or even a year in advance of when these costs are recovered through rates. Significant
increases in the price of gas can also slow our collection efforts as customers experience increased
difficulty in paying their higher energy bills, leading to higher than normal delinquent accounts
receivable. This could contribute to higher short-term debt levels, greater expense associated with
collection efforts and increased bad debt expense.

In Oregon and Washington, our utility has PGA tariffs which provide for annual revisions in
rates resulting from changes in the cost of purchased gas including the expected impact on bad debt
expense. The Oregon PGA tariff provides an incentive to the Company to achieve lower gas costs such
that a small percentage, set annually, of any cost savings (i.e. the difference between the estimated
average PGA gas cost in rates and the actual average gas cost incurred) be recognized as current

30

income or expense. Accordingly, higher average gas costs than those assumed in setting rates can
adversely affect our operating cash flows, liquidity and results of operations. Notwithstanding our
current rate structure, higher gas costs could result in increased pressure on the OPUC or the WUTC to
seek other means to reduce rates, which also could adversely affect our results of operations and cash
flows.

Customer growth risk. Our utility margin, earnings and cash flow may be negatively affected

if we are unable to sustain customer growth rates in our local gas distribution segment.

Our utility margins and earnings growth have largely depended upon the sustained growth of
our residential and commercial customer base due, in part, to the new construction housing market,
conversions of customers to natural gas from other fuel sources and growing commercial use of natural
gas. Continued weakness in the residential new construction and conversion markets, and continued
decline in average use of natural gas by our residential and commercial customers, could result in an
adverse long-term impact on our utility margin, earnings and cash flows.

Risk of competition. Our gas distribution business is subject to increased competition which

could negatively affect our results of operations.

In the residential market, our gas distribution business competes primarily with suppliers of

electricity, fuel oil, propane, and renewable energy providers. We also compete with suppliers of
electricity, fuel oil and renewable energy providers for commercial applications. In the industrial
market, we compete with suppliers of all forms of energy, including oil, electricity, renewable energy
providers and, as it relates to sources of energy for electric power plants, coal and hydro. Competition
among these forms of energy is based on price, efficiency, reliability, performance, market conditions,
technology, environmental impacts and public perception.

Higher natural gas prices have at times eroded, or in some cases eliminated, the competitive

price advantage of natural gas over other energy sources. Technological improvements in other energy
sources such as heat pumps could also erode our competitive advantage. If natural gas prices rise
relative to other energy sources, or if the cost or environmental impact of other energy sources
improves relative to natural gas, it may negatively affect our ability to attract new customers or retain
our existing residential, commercial and industrial customers, which could have a negative impact on
our customer growth rate and results of operations.

Reliance on third parties to supply natural gas risk. We rely on third parties to supply
substantially all of the natural gas in our distribution segment, and limitations on our ability to obtain
supplies, or failure to receive expected supplies for which we have contracted, could have an adverse
impact on our financial results.

Our ability to secure natural gas for current and future sales depends upon our ability to

purchase and receive delivery of supplies of natural gas from third parties, as well as our ability to
acquire supplies directly from new sources. Certain factors including the following may affect our
ability to acquire and deliver natural gas to our current and future customers: suppliers’ or other third
parties’ control over drilling of new wells and operating facilities to transport natural gas to our
distribution system; competition for the acquisition of natural gas; priority allocations on transmission
pipelines; impact of severe weather disruptions to natural gas supplies; failure of third parties to deliver
gas for which we have contracted; the regulatory and pricing policies of federal, state and local

31

government agencies; and the availability of Canadian reserves for export to the United States. If we
are unable to obtain, or are limited in our ability to obtain, natural gas from our current suppliers or
new sources, our financial results could be adversely impacted.

Single transportation pipeline risk. We rely on a single pipeline company for the

transportation of gas to our service territory, a disruption of which could adversely impact our ability
to meet our customers’ gas requirements.

Our distribution system is directly connected to a single interstate pipeline, which is owned and

operated by Northwest Pipeline. The pipeline’s gas flows are bi-directional, transporting gas into the
Portland metropolitan market from two directions: (1) the north, which brings supplies from the British
Columbia and Alberta supply basins; and (2) the east, which brings supplies from the Alberta and the
U.S. Rocky Mountain supply basins. If there is a rupture or inadequate capacity in the pipeline, we
may not be able to meet our customers’ gas requirements and we would likely incur costs associated
with actions necessary to mitigate service disruptions, both of which could significantly and negatively
impact our results of operations.

Weather risk. Warmer than average weather or a failure to renew our weather normalization

mechanism may have a negative impact on our revenues and results of operations.

We are exposed to weather risk primarily in our utility segment. A majority of our volume is
driven by gas sales to space heating residential and commercial customers during the winter heating
season. Current utility rates are based on an assumption of average weather. Warmer than average
weather typically results in lower gas sales. Colder weather typically results in higher gas
sales. Although the effects of warmer or colder weather on utility margin in Oregon are expected to be
mitigated through the operation of our weather normalization mechanism, weather variations from
normal could adversely affect utility margin because we may be required to purchase more or less gas
at spot rates, which may be higher or lower than the rates assumed in our PGA. Also, approximately 9
percent of our Oregon residential and commercial customers have opted out of the weather
normalization mechanism, and 10 percent of our customers are located in Washington where we do not
have a weather normalization mechanism. Furthermore, continuation of the weather normalization
mechanism in Oregon after October 2012 is subject to regulatory approval. As a result, we may not be
fully protected against warmer than average or colder than average weather, both of which may have
an adverse effect on our financial condition, results of operations and cash flows.

Customer conservation risk. Customers’ conservation efforts or a failure to renew our

conservation tariff may have a negative impact on our revenues.

An increasing national focus on energy conservation, including improved building practices

and appliance efficiencies, may result in increased energy conservation by customers, which can
decrease our sales of natural gas and adversely affect our results of operations. In Oregon, we have a
conservation tariff which is designed to recover lost margin due to declines in residential and
commercial customers’ consumption. The conservation tariff is scheduled to expire in October
2012. The failure of the OPUC to extend the conservation tariff in the future could adversely affect our
financial condition, results of operations and cash flows. We do not have a conservation tariff in
Washington, so our results of operations are negatively affected by increasing conservation efforts.

Business improvements risk. Our efforts to integrate, consolidate and streamline our
operations have resulted in increased reliance on technology, the failure or security breach of which
could adversely affect our financial condition and results of operations.

32

Over the last several years we have undertaken a variety of initiatives to integrate, standardize,

centralize and streamline our operations. These efforts have resulted in greater reliance on
technological tools such as: an enterprise resource planning system, which provides an integrated suite
of business application software; an automated dispatch system, which provides integrated planning,
scheduling and dispatching of field resources; an automated meter reading system, which allows for
electronic reading of customers meters; a customer information system, which allows us to calculate
and bill customers for gas service including adjustments such as the weather normalization impact; and
other similar technological tools and initiatives. The failure of any of these or other similarly important
technologies, or our inability to have these technologies supported, updated, expanded or integrated
into other technologies, could adversely impact our operations. Although we have, when possible,
developed alternative sources of technology and built redundancy into our computer networks and
tools, there can be no assurance that these efforts to date would protect us against all potential issues or
disaster occurrences related to the loss of any such technologies or their use.

Furthermore, our operations are subject to cyber-security risks related to breaches in
technologies that are used in our natural gas distribution and storage operations and other business
processes. Additionally, our utility is subject to breaches of security pertaining to sensitive customer,
employee and vendor information maintained by the utility in the normal course of business. Although
we have preventive and detective measures in place to reduce the risk of such security breaches, they
could occur and result in a loss of confidential or proprietary data or security breaches of other
technology business tools, which could adversely affect the utility’s reputation, diminish customer
confidence, disrupt operations, and subject us to possible financial liability or increased regulation or
litigation, any of which could adversely affect our financial condition and results of operations.

Risks Related Primarily to Our Gas Storage Business

Long-term stabilization of gas price risk. Any significant stabilization of natural gas prices

could have a negative impact on the demand for our natural gas storage services, which could
adversely affect our financial results.

Storage businesses benefit from price volatility, which impacts the level of demand for services

and the rates that can be charged for storage services. On a system-wide basis, natural gas is typically
injected into storage between April and October when natural gas prices are generally lower and
withdrawn during the winter months of November through March when natural gas prices are typically
higher. However, the market for natural gas may not continue to experience volatility and seasonal
price sensitivity in the future at the levels previously seen. Largely due to the abundant supply of
natural gas made available by hydraulic fracturing techniques, natural gas prices have dropped
significantly to levels that are near a 10-year low. If prices and volatility remain low or decline further,
then the demand for storage services, and the prices that we will be able to charge for those services,
may decline or be depressed for a prolonged period of time. A sustained decline in these prices could
have an adverse impact on our financial condition, results of operations and cash flows.

Natural gas storage competition risk. Increasing competition in the natural gas storage

business could reduce the demand for our storage services and drive prices down for storage, which
could adversely affect our financial condition, results of operation and cash flows.

Our natural gas storage segment competes primarily with other storage facilities and pipelines.

Natural gas storage is an increasingly competitive business, with ongoing expansions and proposed

33

construction of new storage capacity in California, the U.S. Rocky Mountains and elsewhere in the
United States and Canada. Increased competition in the natural gas storage business could reduce the
demand for our natural gas storage services, drive prices down for our storage business, and adversely
affect our ability to renew or replace existing contracts at rates sufficient to maintain current revenues
and cash flows, which could adversely affect our financial condition, results of operations and cash
flows.

Third-party pipeline risk. Our gas storage business depends on third-party pipelines that
connect our storage facilities to interstate pipelines, the failure or unavailability of which could
adversely affect our financial condition, results of operations and cash flows.

Our gas storage facilities are reliant on the continued operation of a third-party pipeline and

other facilities that provide delivery options to and from our storage facilities. Because we do not own
all of these pipelines, their operation is not within our control. If the third-party pipeline to which we
are connected were to become unavailable for current or future withdrawals or injections of natural gas
due to repairs, damage to the infrastructure, lack of capacity or other reason, our ability to operate
efficiently and satisfy our customers’ needs could be compromised, thereby potentially could have an
adverse impact on our financial condition, results of operations and cash flows.

Operations at new storage facility risk. Operations at our new Gill Ranch storage facility
involves numerous operational risks that may result in a failure to meet expectations or contractual
obligations, additional or unexpected costs and other business risks that could adversely impact our
financial condition, results of operations and cash flows.

In October 2010, we commenced operations at our Gill Ranch storage facility. Operations at a

new storage facility involve many risks. Although we believe that Gill Ranch has been successfully
completed to meet our contractual obligations and project specifications with respect to injection,
withdrawal and gas specifications, the facility is new, has a limited operating history, and is not
expected to reach full design capacity until the end of 2012. If we fail to achieve design capacity, inject
or withdraw natural gas at the levels we expect or at contracted rates, or cannot deliver natural gas
consistent with our expectations or contractual specifications, or otherwise operate as expected, or if
operating costs are substantially higher than we expect or if we fail to control those costs, we may not
be able to contract for storage at the levels and on the terms we expect, and we could incur higher than
expected costs to satisfy our contractual obligations under contracts we obtain, and this could adversely
impact our financial condition, results of operations and cash flows.

ITEM 1B. UNRESOLVED STAFF COMMENTS

We have no unresolved comments.

ITEM 2. PROPERTIES

Utility Properties

Our natural gas pipeline system consists of approximately 13,900 miles of distribution and

transmission mains located in our service territory in Oregon and Washington. In addition, the piping
system includes service pipelines, meters and regulators, and gas regulating and metering stations.
Pipeline mains are located in municipal streets or alleys pursuant to valid franchise or occupation

34

ordinances, in county roads or state highways pursuant to valid agreements or permits granted pursuant
to statute, or on lands of others pursuant to valid easements obtained from the owners of such lands.
We also hold all necessary permits for the crossing of numerous navigable waterways and smaller
tributaries throughout our entire service territory.

We own service building facilities in Portland, as well as various satellite service centers,

garages, warehouses and other buildings necessary and useful in the conduct of our business. We also
lease office space in Portland for our corporate headquarters, which expires on May 31, 2018.
Resource centers are maintained on owned or leased premises at convenient points in the distribution
system to provide service within our utility service territory. We also own LNG storage facilities in
Portland and near Newport, Oregon.

In order to reduce risks associated with gas leakage in older parts of our system, we undertook

an accelerated pipe replacement program under which we removed and replaced 100 percent of our
cast iron mains by the end of 2000. In 2001, we initiated an accelerated pipe replacement program
under which we expect to eliminate all bare steel mains and services in the system by 2021.

Gas Storage Properties

We hold leases and other property interests in approximately 11,300 net acres of underground
natural gas storage in Oregon and approximately 5,000 net acres of underground natural gas storage in
California, and easements and other property interests related to pipelines associates with those
facilities. We own rights to depleted gas reservoirs near Mist, Oregon, that are continuing to be
developed and operated as underground gas storage facilities. We also hold an option to purchase
future storage rights in certain other areas of the Mist gas field in Oregon, as well as in California
related to the Gill Ranch storage project.

We consider all of our properties currently used in our operations, both owned and leased, to be

well maintained, in good operating condition, and, along with planned additions, adequate for our
present and foreseeable future needs.

Our Mortgage and Deed of Trust is a first mortgage lien on substantially all of the property

constituting our utility plant.

ITEM 3. LEGAL PROCEEDINGS

Other than the proceedings disclosed in Note 15 and as discussed below, we have only

nonmaterial litigation in the ordinary course of business.

In December 2010, NW Natural commenced litigation against certain of its historical liability

insurers in Multnomah County Circuit Court, State of Oregon, Case Number 1012-17532. The
defendants include Associated Electric & Gas Insurance Services Limited, Allianz Global Risk US
Insurance Company, certain underwriters at Lloyd’s London, certain London market insurance
companies and 10 other insurance companies. In the suit, NW Natural alleges that the defendant
insurance companies issued third party liability insurance policies to NW Natural and that the
defendants have breached the terms of those policies by failing to reimburse and indemnify NW
Natural for liabilities arising from environmental contamination at certain sites caused or alleged to be
caused by its historical operations. NW Natural seeks damages in excess of $50 million in losses it has

35

incurred to date, as well as declaratory relief for additional losses it expects to incur in the future. In
December 2011, NW Natural reached a settlement with Associated Electric & Gas Insurance Services
Limited and dismissed that insurer from the litigation.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

36

PART II

ITEM 5. MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER

MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

(A) Our common stock is listed and trades on the New York Stock Exchange under the

symbol “NWN.”

The high and low trades for our common stock during the past two years were as follows:

Quarter Ended

March 31
June 30
September 30
December 31

2011

High

$48.72
46.40
46.77
48.98

Low

$43.92
43.57
39.63
42.52

2010

High

$47.54
49.18
49.00
50.86

Low

$41.05
41.90
42.63
44.02

The closing quotations for our common stock on December 31, 2011 and 2010 were $47.93 and

$46.47, respectively.

(B) As of December 31, 2011, there were 6,745 holders of record of our common stock.

(C) We have paid quarterly dividends on our common stock in each year since the stock first

was issued to the public in 1951. Annual common dividend payments per share, adjusted for stock
splits, have increased each year since 1956. Dividends per share paid during the past two years were as
follows:

Payment Date

February 15
May 15
August 15
November 15

Total per share

2011

$0.435
0.435
0.435
0.445

$1.750

2010

$0.415
0.415
0.415
0.435

$1.680

The amount and timing of dividends payable on our common stock are within the sole
discretion of our Board of Directors. Subject to Board approval, we expect to continue paying cash
dividends on our common stock on a quarterly basis. However, the declaration and amount of future
dividends depend upon our earnings, cash flows, financial condition and other factors.

37

(D) The following table provides information about purchases of our equity securities that are

registered pursuant to Section 12 of the Securities Exchange Act of 1934 during the quarter ended
December 2011:

ISSUER PURCHASES OF EQUITY SECURITIES

(a)

(b)

Total Number
of Shares
Purchased (1)

Average
Price Paid
per Share

(c)
Total Number of Shares
Purchased as Part of
Publicly Announced
Plans or Programs (2)

(d)
Maximum Dollar Value of
Shares that May Yet Be
Purchased Under the
Plans or Programs (2)

-
3,262
-

3,262

-
$
$47.00
-
$

$47.00

2,124,528
-
-
-

2,124,528

$16,732,648
-
-
-

$16,732,648

Period

Balance forward
10/01/11-10/31/11
11/01/11-11/30/11
12/01/11-12/31/11

Total

(1) During the quarter ended December 31, 2011, 3,262 shares of our common stock were purchased on the
open market to meet the requirements of our deferred compensation programs. During the quarter ended
December 31, 2011, no shares of our common stock were accepted as payment for stock option exercises
pursuant to our Restated Stock Option Plan.

(2) We have a share repurchase program under which we purchase NWN common stock on the open market or
through privately negotiated transactions. The program is currently authorized by the Board through
May 31, 2012, with approval to repurchase up to an aggregate of 2.8 million shares or up to an aggregate of
$100 million. During the quarter ended December 31, 2011, no shares of our common stock were
repurchased pursuant to this program. Since the program’s inception in 2000, we have repurchased
approximately 2.1 million shares of common stock at a total cost of approximately $83.3 million.

38

ITEM 6. SELECTED FINANCIAL DATA

Thousands, except per share amounts

2011

For the year ended December 31,
2008
2009
2010

2007

Net operating revenues
Net income
Earnings per share of common stock:

Basic
Diluted

Dividends paid per share of common stock
Total assets—at end of period
Common stock equity
Long-term debt

$ 369,433
63,898

$ 367,581
72,667

$ 376,887
75,122

$ 356,215
69,525

$ 369,042
74,497

2.39
2.39
1.75
2,746,574
714,488
641,700

2.73
2.73
1.68
2,616,616
693,101
591,700

2.83
2.83
1.60
2,399,252
660,105
601,700

2.63
2.61
1.52
2,378,152
628,373
512,000

2.78
2.76
1.44
2,014,061
594,751
512,000

39

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

RESULTS OF OPERATIONS

The following is management’s assessment of Northwest Natural Gas Company’s (NW
Natural) financial condition, including the principal factors that affect results of operations. The
discussion refers to our consolidated activities for the years ended December 31, 2011, 2010, and 2009.
Unless otherwise indicated, references in this discussion to “Notes” are to the Notes to Consolidated
Financial Statements in this report.

The consolidated financial statements include the accounts of NW Natural and its direct and

indirect wholly-owned subsidiaries which include: Gill Ranch Storage, LLC (Gill Ranch), NW Natural
Energy, LLC (NWN Energy), NW Natural Gas Storage, LLC (NWN Gas Storage), and NNG Financial
Corporation (NNG Financial). These statements also include accounts related to an equity investment
in Palomar Gas Holdings, LLC (PGH), which is pursuing the development of a proposed natural gas
pipeline through its wholly-owned subsidiary Palomar Gas Transmission, LLC (Palomar). These
accounts make up our regulated local gas distribution business, our regulated gas storage businesses,
and other regulated and non-regulated investments primarily in energy-related businesses. In this
report, the term “utility” is used to describe our regulated local gas distribution business (local
distribution company), and the term “non-utility” is used to describe our regulated gas storage
businesses (gas storage) as well as our other regulated and non-regulated investments and business
activities (other). For a further discussion of our business segments, see Note 4.

In addition to presenting results of operations and earnings amounts in total, certain measures

are expressed in cents per share. These amounts reflect factors that directly impact earnings. We
believe this per share information is useful because it enables readers to better understand the impact of
these factors on consolidated earnings. All references in this section to earnings per share are on the
basis of diluted shares. We also present free cash flow as we believe this supplemental information
enables the reader of the financial statements to better understand our cash generating ability and to
benefit from seeing cash flow results from management’s perspective in addition to the traditional
GAAP presentation (see “Cash Flows—Financing Activities,” below). We use such non-GAAP (i.e.
non-generally accepted accounting principles) measures in analyzing our financial performance
because we believe that they provide useful information to our investors and creditors in evaluating
NW Natural’s financial condition and results of operations.

Executive Summary

Highlights of 2011 include:

• Consolidated earnings of $63.9 million and $2.39 per share in 2011, compared to $72.7

million and $2.73 in 2010;

• Net income from utility operations decreased $5.7 million, from $66.3 million in 2010 to

$60.5 million in 2011;

• Net income from gas storage operations decreased $2.0 million, from $6.1 million in 2010

to $4.1 million in 2011;

• Net operating revenues (margin) increased 1 percent, from $367.6 million in 2010 to $369.4

million in 2011;

• Total operating expenses increased 7 percent, from $210.0 million in 2010 to $224.6 million

in 2011;

40

• Cash flow from operations increased $107.0 million, from $126.5 million in 2010 to $233.5

million in 2011;

• Utility customer growth rate was 0.8 percent in 2011, compared to 0.9 percent in 2010; and
• Dividends paid increased 4 percent, from $1.68 per share in 2010 to $1.75 in 2011,

reflecting the 56th consecutive year of dividend increases to shareholders.

Our primary businesses consist of regulated utility and gas storage operations. Factors critical
to the success of the utility include: maintaining a safe and reliable distribution system; acquiring an
adequate supply of natural gas; providing distribution services at competitive prices; and being able to
recover our operating and capital costs in the rates charged to customers in a reasonable and timely
manner. Our utility business is regulated by two state commissions, the Public Utility Commission of
Oregon (OPUC) and the Washington Utilities and Transportation Commission (WUTC). Factors
critical to the success of our gas storage business include: developing and operating storage capacity at
competitive market prices; retaining customers and successfully marketing available storage capacity
to new customers; planning for the replacement of capacity that is expected to be recalled by the utility
to serve growing demands of its core customers; charging adequate rates to recover investment and
operating costs; and being able to obtain financing to fund expansions and working capital
requirements. Our gas storage businesses are, in part, regulated by the California Public Utilities
Commission (CPUC), the Federal Energy Regulatory Commission (FERC) and the OPUC.

2012 Outlook

In 2012, we will be focused on strengthening our core businesses, enhancing our strategic

position, advancing key business projects, and leveraging our organizational resources.

Strengthen Core Businesses. Our core businesses are local gas distribution (utility) and gas

storage. In the utility, we will continue our efforts to develop, integrate, consolidate and streamline our
operations using new technologies, which are expected to include a workforce scheduling system, a
procurement system, and an automated dispatching system. In our storage business, we will focus on
maximizing our storage capacity and optimizing our revenue opportunities. We believe that investing
in operating efficiencies and in marketing opportunities for our core businesses positions us well for
growth now and into the future as the economy recovers.

Enhance Strategic Position. We believe our core businesses are positioned strategically and
competitively. The decline in gas prices and the abundance of shale gas supplies creates opportunities
for both core businesses. Specifically, it creates opportunities for us to expand our market share in the
utility by leveraging our natural gas’ competitive price advantage. Moreover, our gas storage facilities
strategically position us to quickly respond to market demand with storage capacity when gas prices
increase or become more volatile. Together, our businesses competitively position us to meet market
demands when the economy recovers.

Advance Key Projects. We seek to create shareholder value by innovatively addressing the

needs of our customers, employees and the communities we serve while addressing economic,
regulatory and environmental challenges. To that end, we are advancing key business projects such as
acquiring long-term gas reserves on behalf of our utility customers, pursuing future storage
opportunities at Mist, and improving our operations at Gill Ranch. We also continue to pursue regional
solutions for reliable and safe energy needs through our investment in natural gas infrastructure, such
as the Palomar pipeline.

41

Leverage Resources. Our employees are our most valued resource. To support and leverage
this valuable resource, we will continue to invest in new technologies and improve our facilities. We
believe this will allow us to maintain a positive and safe work environment, to provide on-going
training and workforce development, and also to gain greater operational efficiency.

Issues, Challenges and Performance Measures

Economic weakness. Weakness in local, national and global economies continues to impact

utility customer growth, business demand for natural gas and market prices for gas storage. Our
utility’s customer growth rate remained relatively flat for the third year in a row at 0.8 percent,
compared to 0.9 percent in 2010 and 0.8 percent in 2009. The local economy is beginning to show
signs of a slow recovery as unemployment rates in Oregon and southwest Washington dropped from
approximately 10 percent in 2010 to about 9 percent at the end of 2011, and industrial demand for
natural gas increased in 2011 by 1 percent over 2010. We believe our utility is well positioned to add
customers as the economy recovers because of low and stable natural gas prices, our relatively low
market penetration, our ongoing focus on converting homes and businesses to natural gas, and the
potential for environmental initiatives that could favor natural gas use in our region.

Managing gas prices and supplies. Our gas acquisition strategy is regularly updated to secure
sufficient supplies of natural gas to meet the needs of our utility customers and to hedge gas prices so
that we can effectively manage costs, reduce price volatility and maintain a competitive advantage.
With recent developments in drilling technologies and substantial access to supplies from shale gas
formations around the U.S. and in Canada, the supply outlook for North American natural gas is
strong, which is contributing to lower and more stable gas prices.

The Purchased Gas Adjustment (PGA) mechanisms in Oregon and Washington, along with our
gas price hedging strategies, including gas reserves and storage supplies, enable us to reduce earnings
exposure for the company and secure lower gas costs for our customers. These lower gas prices,
coupled with our focus on customer service and cost-effective energy efficiency programs, can help
strengthen natural gas’ competitive advantage over other energy sources in key markets.

We typically hedge gas prices on approximately 75 percent of our anticipated year-round sales
volumes based on normal weather. For the 2011-12 gas year (November 1, 2011 – October 31, 2012),
we entered the gas year hedged at a level of approximately 75 percent of our forecasted sales volumes,
including 51 percent financially hedged and 24 percent physically hedged with a combination of gas
inventories in storage, local production from the Mist area, and production of gas reserves from our
investment with Encana Oil & Gas (USA) Inc. (Encana). The production of gas reserves is related to a
new investment we made beginning in 2011 to hold working interests in leases related to both currently
producing and new wells in Encana’s Jonah gas field located in Rock Springs, Wyoming. For further
discussion of gas reserves, see Investments in Gas Reserves under Strategic Opportunities below and
Gas Reserves under Rate Mechanisms below.

In addition to the amount of gas hedged for the current gas contract year, we are also hedged at

approximately 32 percent for the 2012-13 gas year and between 9 and 13 percent hedged for annual
requirements over the following five gas years. Our hedge levels are subject to change based on actual
load volumes, which depend to a certain extent on weather and economic conditions. Also, our storage
levels may increase or decrease based on storage expansion or storage recall by the utility. As for gas
reserves, these levels are estimates of production, which are subject to change based on possible
unforeseen events that include the impact from speed of drilling and the volume of production.

42

Although stable gas prices provide opportunities to manage costs for our utility customers, they

also present challenges for our gas storage business. Stable natural gas prices may reduce the pricing
for storage services. We are focused on improving the results from our gas storage businesses.

Environmental costs. We accrue all material environmental loss contingencies related to our

properties that require environmental investigation or remediation. Due to numerous uncertainties
surrounding the preliminary nature of investigations or the developing nature of remediation
requirements, actual costs could vary significantly from our loss estimates. As a regulated utility, we
are allowed to defer certain costs pursuant to regulatory decisions. We currently have regulatory
approval to defer certain environmental costs, and to seek recovery of these amounts in future rates to
customers. However, we are expected to pursue recovery from insurance policies and only seek
recovery from customers for amounts not covered by insurance. Ultimate recovery of environmental
costs, either from regulated utility rates or from insurance, will depend on our ability to effectively
manage costs and demonstrate that costs were prudently incurred. Recovery may vary significantly
from amounts currently recorded as regulatory assets, and amounts not recovered would be required to
be charged to income in the period they were deemed to be unrecoverable. See Note 15.

Climate change. We recognize that our businesses are likely to be impacted by future carbon

constraints, and we are seeking clean energy growth opportunities that position us for long-term
success in a lower carbon energy economy and to advance our customers’ interests in energy
conservation, efficiency and environmental stewardship. A variety of federal, state, local and
international climate change initiatives, including new regulations, are underway, but we cannot
determine the impact of these initiatives at this time. For example, an array of Environmental
Protection Agency (EPA) rules impacting coal plants may cause some coal plants to shut down early
although the EPA is not mandating coal plant closures. Coal plant shut downs could increase the
demand for natural gas as a lower carbon emission fuel and create opportunities for us. Similarly,
because natural gas has a relatively low carbon content, it is also possible that future carbon constraints
could create additional demand for natural gas for base load electric generation, direct use in homes
and businesses, backing up intermittent renewable resources and as a transportation fuel to displace
gasoline and diesel. Under EPA’s greenhouse gas reporting rules adopted in 2009, we report system
throughput to the EPA on an annual basis. The first report under these provisions was due to EPA in
September 2011. EPA also issued additional greenhouse gas reporting regulations in 2010, which
required mandatory reporting of unintended greenhouse gas releases from petroleum and natural gas
facilities. The first report is due under these rules in September 2012. While our CO2 equivalent
emission levels are relatively small, the adoption and implementation of any regulations imposing
reporting obligations, or limiting emissions of greenhouse gases associated with our operations, could
result in an increase in the prices we charge our customers or a decline in the demand for natural gas.

Performance measures. In order to deal with the challenges affecting our businesses, we

annually review and update our strategic plan to map out a course for the next several years. Our plan
includes strategies for: further improving our utility gas distribution system; enhancing utility services
and operations; optimizing and growing our non-utility gas storage businesses; investing in natural gas
infrastructure projects when necessary to support the energy needs of our region; and maintaining a
leadership role within the gas utility industry by addressing long-term energy policies and pursuing
business opportunities that support new clean energy technologies. We intend to measure our
performance and monitor progress on relevant metrics including, but not limited to: earnings per share
growth; total shareholder return; return on invested capital; utility return on equity; utility customer
satisfaction ratings; utility margin; utility capital and operations and maintenance expense per
customer; and earnings before interest, taxes, depreciation and amortization and (EBITDA).

43

Strategic Opportunities

Business Process Improvements. We continue to evaluate, develop and implement business

strategies to improve operational efficiencies and respond to economic and competitive challenges.
Over the last few years, our efforts have been to develop, integrate, consolidate and streamline
operations, while supporting our employees with training and new technology tools.

From 2006 through 2010, we reduced staffing levels in response to work load declines related
to the low customer growth environment and efficiency improvements, resulting in a reduction of full-
time, utility positions from over 1,300 in early 2006 to about 1,050 at the end of 2011. Technology
investments, workforce reductions and other initiatives have contributed to a significant increase in
productivity. The number of utility customers served per operating employee increased by 32 percent,
from 738 at the end of 2005 to 976 at the end of 2011. These efforts are expected to contribute to long-
term operational efficiencies and lower operating and capital costs throughout NW Natural. However,
we continue to look for new ways to improve our business as service demands and system safety
requirements increase and we remain committed to increasing shareholder value.

Gas Storage Development. We own and operate two underground gas storage facilities—the

Mist facility in Oregon and the Gill Ranch facility in Fresno, California. Our wholly-owned subsidiary,
Gill Ranch, holds a 75 percent undivided ownership interest in the Gill Ranch facility, with Pacific Gas
and Electric Company (PG&E) owning the other 25 percent interest. The initial development of Gill
Ranch was designed to provide us with 15 Bcf of gas storage capacity by the end of 2012, with
pipeline capacity on 27 miles of gas transmission pipeline connecting the Gill Ranch facility to an
interconnect on PG&E’s transmission system. See Note 4.

Due to an abundant supply of natural gas and lower, more stable prices in North America,
current storage values are expected to remain low in the near term, which will likely affect the prices at
which Gill Ranch is able to contract. Gas prices have hit a 10-year low and this has resulted in certain
natural gas producers reducing their levels of exploration and production. At the same time, we expect
these lower gas prices to increase demand for natural gas as the pricing provides a competitive
advantage over alternative fuel sources including potential demand for exporting natural gas.
Combined, these forces may ultimately result in upward pressure on gas prices and return some price
volatility to natural gas markets.

Our storage facilities help position us to capitalize on rising demand, increasing gas prices or

greater market volatility because storage operations benefit from seasonal swings in commodity pricing
and market volatility. Additionally, if market demand increases and we are able to obtain financing and
regulatory permits, we have the ability to expand the Gill Ranch facility beyond its current capacity
without further expansion of our gas transmission pipeline. We estimate that the current Gill Ranch
storage facility could support an aggregate storage capacity of around 40 Bcf with certain infrastructure
modifications, of which we would have the rights to 50 percent of the total.

The Pacific Northwest storage markets also are impacted by lower gas prices and lack of gas

price volatility, although less than California markets primarily because of fewer regional competitors.
Nevertheless, we continue to plan for expansion of our gas storage facilities at Mist in anticipation of
increased natural gas demand for electric generation in the Pacific Northwest. Currently we do not
have a set timeline for development, but we believe the earliest timeframe for completing the next Mist
expansion is 2016. In the meantime, we expect to continue working on preliminary design and project
scope, which will most likely include the development of storage wells, a second compression
station and additional pipeline gathering facilities that would enable future storage expansions.

44

Pipeline Diversification. Currently, our utility operations and gas storage operations at Mist

depend on a single bi-directional interstate transmission pipeline to ship gas supplies. Palomar, a
wholly-owned subsidiary of PGH, is pursuing the development of a new gas transmission pipeline that
would provide an interconnection with our utility distribution system. PGH is owned 50 percent by our
NWN Energy subsidiary and 50 percent by TransCanada American Investments Ltd., an indirect
wholly-owned subsidiary of TransCanada Corporation. The Palomar pipeline was originally proposed
with an east and a west segment, but Palomar currently plans to design and develop an east-only
pipeline to serve our utility customers as well as growing natural gas markets in Oregon and other parts
of the Pacific Northwest. In the second quarter of 2011, Palomar determined it should discontinue
efforts to develop the west segment of the pipeline after the supporting shipper declared bankruptcy.
As a result, we recorded a charge of $0.3 million for our portion of the unrecovered costs related to the
west segment.

Regarding the proposed east pipeline segment, Palomar negotiated a non-binding memorandum

of understanding with The Williams Companies’ Northwest Pipeline (Northwest Pipeline), which
contemplates Northwest Pipeline becoming a part owner in the Palomar project. This joint agreement
would consolidate the region’s efforts to develop a cross-Cascades pipeline around the use of the
Palomar route. Northwest Pipeline owns and operates the single bi-directional pipeline that connects to
NW Natural’s utility distribution system.

The proposed east segment pipeline would be regulated by FERC. In March 2011, Palomar

withdrew its original application with FERC for the proposed pipeline in Oregon, but at the same time
informed FERC that it intends to file a new application with a modified scope that excludes the west
segment, after it has conducted a new open season to obtain commercial support for the east segment.
The timing for when the Palomar pipeline is expected to be built and placed into service will be
dependent upon regulatory permits and commercial support from shippers.

In the fourth quarter of 2011, we recorded a charge of $1.0 million related to the investment in
the east segment of the project. This charge was for costs that were determined to be less than probable
of recovery in a FERC rate making proceeding because they might be deemed outdated when we refile
with FERC. Our investment balance in Palomar at December 31, 2011 after the charge was $13.5
million, which represents our share of Palomar’s development costs related to the east segment. See
Note 12 and see also “Financial Condition—Cash Flows—Investing Activities,” below for further
discussion on the status of Palomar.

Gas Reserves. In addition to hedging gas prices with financial derivative contracts, we recently

signed an agreement with Encana to acquire physical gas supplies to meet a portion of our Oregon
utility customers’ requirements over 30 years. During the first 10 years, we forecast the volumes of gas
received under the Encana agreement to provide approximately 8 to 10 percent of the average annual
requirements of our utility customers. Under the agreement, we expect to invest approximately $45
million to $55 million per year for five years, with our total investment expected to be about $250
million. We pay a fixed portion of drilling costs per well. Encana assigns to us working interests in
leases to certain sections of the Jonah gas field, located near Rock Springs, Wyoming. These sections
include both future and currently producing wells. The working interests will entitle us to receive a
portion of the gas produced in these sections. Operation of the wells will be governed by a joint
operating agreement under which Encana will be the operator, and we will pay our proportionate share
of operating costs. See Results of Operations—Regulatory Matters—Rate Mechanisms—Gas Reserves
below and 2012 Outlook—Issues, Challenges and Performance Measures—Managing gas prices and
supplies above.

45

Consolidated Earnings and Dividends

Consolidated net income was $63.9 million, or $2.39 per share, for the year ended
December 31, 2011, compared to $72.7 million, or $2.73 per share, and $75.1 million, or $2.83 per
share, for the years ended December 31, 2010 and 2009, respectively. Consolidated earnings decreased
in fiscal year 2011 primarily due to the loss of income from the repeal of Oregon’s legislative rule on
utility income tax true up, a refund of utility property taxes in 2010, and a lower earnings contribution
from our gas storage segment, which includes the first full year of operations for subsidiaries Gill
Ranch and NWN Gas Storage. These decreases were partially offset by increased margin results from
sales and transportation revenues reported by our utility gas distribution business. Consolidated returns
on average stockholders’ equity for these three years were 9.1 percent, 10.7 percent and 11.7 percent,
respectively. See “Application of Critical Accounting Policies and Estimates—Regulatory
Accounting” for a discussion of the legislative rule.

2011 compared to 2010:

The most significant factors contributing to the $8.8 million decrease in consolidated net

income were:

•

•

•

•

a $7.2 million net charge against utility margin taken in 2011, plus the $7.7 million of
margin revenues accrued in 2010, related to the repeal of Oregon’s legislative rule on utility
income taxes. See “Results of Operations—Business Segments—Utility Operations—
Regulatory Adjustment for Income Taxes Paid,” below for further explanation;
a $5.4 million increase in general taxes, primarily due to a $5.2 million refund of utility
property taxes received in 2010, partially offset by a $0.9 million decrease in other taxes at
the utility, and a $1.3 million increase in property and other taxes at Gill Ranch;
a $4.9 million increase in depreciation and amortization expense, due to a $1.2 million
increase at the utility and a $3.7 million increase at Gill Ranch; and
a $4.3 million increase in operations and maintenance expense, primarily due to a $3.2
million increase at Gill Ranch reflecting first-year operating expenses.

Partially offsetting the above factors were:

•

•

an $11.3 million increase in utility margin attributable to an increase in customers gas use,
reflecting gains from colder weather, customer growth and a slight increase in industrial
demand; and
a $6.1 million decrease in income tax expense related to lower taxable income.

2010 compared to 2009:

The most significant factors contributing to the $2.4 million decrease in consolidated net

income were:

•

•

•

a $13.5 million decrease in utility margin from the regulatory gas cost incentive sharing
mechanism, which reflects gains of $15.1 million in 2009 compared to gains of $1.6 million
in 2010;
a $2.9 million net loss from Gill Ranch, and a $0.6 million net loss from NWN Gas Storage,
primarily reflecting higher operating expenses related to start-up activities;
a $2.8 million increase in income tax expense primarily reflecting higher taxable income
from the utility, including higher amortization of regulatory tax balances related to pre-1981
assets which are offset by increased revenues collected in utility margin; and

46

•

a $1.9 million increase in interest expense primarily reflecting the full year effect of lower-
rate short-term debt refinanced with higher-rate long-term debt during 2009 and higher
balances of total debt outstanding.

Partially offsetting the above factors were:

•

•

•

a $14.3 million decrease in utility operating expenses primarily due to lower property tax,
payroll, bad debt, and employee benefit costs;
a $5.0 million increase in utility margin from residential and commercial customers, after
adjustments for weather and decoupling mechanisms, primarily due to colder weather
benefits in the second quarter of 2010 when weather normalization was not in effect,
customer growth and the rate recovery of higher income tax expenses related to an increase
in Oregon tax rates and the accelerated amortization of regulatory tax assets; and
a $3.4 million increase in other income primarily due to higher carrying costs from utility
deferred regulatory account balances and interest income from a utility property tax refund,
partially offset by a decrease in non-utility gains from company-owned life insurance.

Dividends paid on our common stock were $1.75 per share in 2011, compared to $1.68 per

share in 2010 and $1.60 per share in 2009. The Board of Directors declared a quarterly dividend on our
common stock of 44.5 cents per share, payable on February 15, 2012, increasing the indicated annual
dividend rate to $1.78 per share.

Application of Critical Accounting Policies and Estimates

In preparing our financial statements using generally accepted accounting principles in the

United States of America (U.S. GAAP), management exercises judgment in the selection and
application of accounting principles, including making estimates and assumptions that affect reported
amounts of assets, liabilities, revenues, expenses and related disclosures in the financial
statements. Management considers our critical accounting policies to be those which are most
important to the representation of our financial condition and results of operations and which require
management’s most difficult and subjective or complex judgments, including accounting estimates that
could result in materially different amounts if we reported under different conditions or used different
assumptions. Our most critical estimates and judgments include accounting for:

•
•
•
•
•
•

regulatory cost recovery and amortizations;
revenue recognition;
derivative instruments and hedging activities;
pensions and postretirement benefits;
income taxes; and
environmental contingencies.

Management has discussed its current estimates and judgments used in the application of

critical accounting policies with the Audit Committee of the Board. Within the context of our critical
accounting policies and estimates, management is not aware of any reasonably likely events or
circumstances that would result in materially different amounts being reported. For a description of
recent accounting pronouncements that could have an impact on our financial condition, results of
operations or cash flows, see Note 2.

47

Regulatory Accounting

Our utility is regulated by the OPUC and WUTC, which establish the rates and rules governing
utility services provided to customers, and, to a certain extent, set forth special accounting treatment for
certain regulatory transactions. In general, we use the same accounting principles as non-regulated
companies reporting under U.S. GAAP. However, authoritative guidance for regulated operations
(regulatory accounting) require different accounting treatment for regulated companies to show the effects
of such regulation. For example, we account for the cost of gas using a PGA deferral and cost recovery
mechanism, which is submitted for approval annually to the OPUC and WUTC (see “Results of
Operations—Regulatory Matters—Rate Mechanisms,” below). There are other expenses and revenues that
the OPUC or WUTC may require us to defer for recovery or refund in future periods. Regulatory
accounting requires us to account for these types of deferred expenses (or deferred revenues) as regulatory
assets (or regulatory liabilities) on the balance sheet. When we are allowed to recover these expenses from,
or are required to refund them to, customers, we recognize the expense or revenue on the income statement
at the same time we realize the adjustment to amounts included in utility rates charged to customers.

The conditions we must satisfy to adopt the accounting policies and practices of regulatory

accounting, which are applicable to regulated companies, include:

•
•
•

an independent regulator sets rates;
the regulator sets the rates to cover specific costs of delivering service; and
the service territory lacks competitive pressures to reduce rates below the rates set by the
regulator.

Because our utility satisfies all three conditions, we continue to apply regulatory accounting to

our utility operations. Future accounting changes, regulatory changes or changes in the competitive
environment could require us to discontinue the application of regulatory accounting for some or all of
our regulated businesses. This would require the write-off of those regulatory assets and liabilities that
would no longer be probable of recovery from or refund to customers. Based on current accounting,
regulatory and competitive conditions, we believe that it is reasonable to expect continued application
of regulatory accounting for our utility activities, and that all of our regulatory assets and liabilities at
December 31, 2011 and 2010 are recoverable or refundable through future customer rates. The net
balance in regulatory asset and liability accounts as of December 31, 2011 and 2010 was $156.6
million and $125.8 million, of assets, respectively. See “Industry Regulation” in Note 2.

Revenue Recognition

Utility and non-utility revenues, which are derived primarily from the sale, transportation and

storage of natural gas, are recognized upon the delivery of gas commodity or services rendered to
customers. Revenues are accrued for gas delivered and services rendered to customers, but not yet
billed, based on estimates from the last meter reading date to month end (accrued unbilled
revenues). Accrued unbilled revenues are primarily based on a percentage estimate of amounts
unbilled each month, which is dependent upon a number of factors, some of which require
management’s judgment. These factors include total gas receipts and deliveries, customer meter
reading dates, customer usage patterns and weather. Accrued unbilled revenue estimates are reversed
the following month when actual billings occur. Estimated unbilled revenues at December 31, 2011
and 2010 were $61.9 million and $64.8 million, respectively. The decrease in accrued unbilled
revenues at year-end 2011 was primarily due to lower volumes in December 2011, reflecting warmer
weather late in the month, and lower customer billing rates. If the estimated percentage of unbilled

48

volume at December 31, 2011 was adjusted up or down by 1 percent, then unbilled revenues, net
operating revenues and net income would have increased or decreased by an estimated $1.9 million,
$0.5 million and $0.6 million, respectively.

From 2007 through 2010, utility revenues included the recognition of a regulatory adjustment

for income taxes paid (commonly referred to as SB 408). Under SB 408, we were required to
automatically implement a rate refund, or a rate surcharge, to utility customers on an annual basis. The
refund or surcharge amount was based on estimated differences between income taxes paid and income
taxes collected in customer rates. We recorded the refund, or surcharge, each quarter based on the
annual amount to be recognized. On May 24, 2011 the Oregon Governor signed Senate Bill 967 (SB
967), which repealed SB 408. The new law required utilities in Oregon to reverse amounts accrued for
the 2010 and 2011 tax years, which resulted in us recording a one-time pre-tax charge to earnings in
the second quarter of 2011 in the amount of $7.4 million ($4.4 million after-tax or 17 cents per share).
For further discussion, see “Results of Operations—Business Segments—Utility Operations—
Regulatory Adjustment for Income Taxes Paid,” below.

Non-utility revenues, derived primarily from our gas storage business segment, are recognized
upon delivery of service to customers. Revenues from our asset management partner are recognized as
earned based on multiple revenue elements, which is generally over the period of each asset
management deal, except for contracts with a guaranteed amount which are amortized pro-rata over the
life of the contract.

Accounting for Derivative Instruments and Hedging Activities

Our gas acquisition and hedging policies set forth guidelines for using financial derivative

instruments to support prudent risk management strategies. These policies specifically prohibit the use
of derivatives for trading or speculative purposes. The accounting rules for determining whether a
contract meets the definition of a derivative instrument or qualifies for hedge accounting treatment are
complex. The contracts that meet the definition of a derivative instrument are recorded on our balance
sheet at fair value. If certain regulatory conditions are met, then the derivative instrument fair value is
recorded together with an offsetting entry to a regulatory asset or liability account pursuant to
regulatory accounting (see Note 2, “Industry Regulation”), and no unrealized gain or loss is recognized
in current income. The gain or loss from the fair value of a derivative instrument subject to regulatory
deferral is included in the recovery from, or refund to, utility customers in future periods (see
“Regulatory Accounting,” above). If a derivative contract is not subject to regulatory deferral, then the
accounting treatment for unrealized gains and losses is recorded in accordance with accounting
standards for derivatives and hedging (see Note 2, “Derivatives” and “Industry Regulation”) which is
either in current income or in accumulated other comprehensive income under common stock equity on
the balance sheet. Our derivative contracts outstanding at December 31, 2011 were measured at fair
value using models or other market accepted valuation methodologies derived from observable market
data. Our estimate of fair value may change significantly from period-to-period depending on market
conditions and prices. These changes may have an impact on our results of operations, but the impact
would largely be mitigated due to the majority of our derivatives activities being subject to regulatory
deferral treatment. For estimated fair value of unrealized gains and losses at December 31, 2011 and
2010, see Note 13.

Commodity-based derivative contracts entered into by the utility after our annual PGA filing
for the current gas contract period are subject to a regulatory incentive sharing mechanism in Oregon
(see “Results of Operations—Regulatory Matters—Rate Mechanisms—Purchased Gas Adjustment,”

49

below). The portion not deferred to a regulatory account pursuant to that sharing agreement is
recognized either in current income for contracts not qualifying for hedge accounting or in
accumulated other comprehensive income for contracts qualifying for hedge accounting.

Derivative contracts not qualifying for regulatory deferral are subject to a hedge effectiveness

test to determine the financial statement treatment of each specific derivative. As of December 31,
2011, all of our derivatives were effective economic hedges and either qualified or were expected to
qualify for regulatory deferral or hedge accounting treatment. We use the hypothetical derivative
method under accounting standards for derivatives and hedging to determine the hedge effectiveness
for our interest rate swaps and the dollar offset method for other derivative contracts under accounting
standards for derivatives and hedging. The effectiveness test applied to financial derivatives is
dependent on the type of derivative and its use.

The following table summarizes the amount of gains and losses realized from commodity price,

interest rate and currency hedge transactions for the last three years:

Thousands

Net gain (loss) on commodity-price swaps—utility
Net gain (loss) on commodity-price options—utility
Net gain (loss) on interest rate swap—utility

2011

2010

2009

$(53,834) $(60,362) $(172,089)
(5,809)
(10,096)

(2,695)
-

(610)
-

Subtotal—utility

Net gain (loss) on foreign currency forward purchases—utility

Total net gain (loss) realized

(56,529)
(52)

(60,972)
72

(187,994)
88

$(56,581) $(60,900) $(187,906)

Realized gains (losses) from commodity hedges and foreign currency forward purchase
contracts are recorded as reductions (increases) to the cost of gas and are included in the calculation of
annual PGA rate changes. Realized gains (losses) from interest rate hedges are recorded as reductions
(increases) to interest charges over the term of the underlying debt issuances. Unrealized gains and
losses from commodity hedges, foreign currency hedges and interest rate hedges, which reflect
quarterly mark-to-market valuations, are generally not recognized in current income or accumulated
other comprehensive income, but are recorded as regulatory liabilities or regulatory assets, and are
offset by a corresponding balance in derivative instruments (see Note 13).

Accounting for Pensions and Postretirement Benefits

We maintain two qualified non-contributory defined benefit pension plans covering a majority

of our regular employees with more than one year of service, several non-qualified supplemental
pension plans for eligible executive officers and certain key employees, and other postretirement
employee benefit plans. We also have a qualified defined contribution plan (Retirement K Savings
Plan) for all eligible employees. Only the two qualified defined benefit pension plans and Retirement K
Savings Plan have plan assets, which are held in qualified trusts to fund the respective retirement
benefits. Effective January 1, 2007 and 2010, the qualified defined benefit retirement plans for
non-union employees and for union employees, respectively, were closed to new participants. These
plans were not available to employees at any of our subsidiary companies. Non-union and union
employees hired or re-hired after December 31, 2006 and 2009, respectively, and our subsidiary
employees, are provided an enhanced Retirement K Savings Plan benefit. Also, effective January 1,
2007 the postretirement Welfare Benefit Plan for Non-Bargaining Unit Employees was closed to new
participants after December 31, 2006.

50

Net periodic pension and postretirement benefit costs (retirement benefit costs) and projected
benefit obligations (benefit obligations) are determined in accordance with accounting standards for
compensation and retirement benefits using a number of key assumptions including discount rates, rate
of compensation increases, retirement ages, mortality rates and an expected long-term return on plan
assets (see Note 9). These key assumptions have a significant impact on the pension amounts recorded
and disclosed. Retirement benefit costs consist of service costs, interest costs, the amortization of
actuarial gains, losses and prior service costs, the expected returns on plan assets and, in part, on a
market-related valuation of assets, if applicable. The market-related asset valuation reflects differences
between expected returns and actual investment returns, which we recognize over a three-year period
or less from the year in which they occur, thereby reducing year-to-year volatility in retirement benefit
costs.

Accounting standards also require balance sheet recognition of the overfunded or underfunded

status of pension and postretirement benefit plans in accumulated other comprehensive income
(AOCI), net of tax, based on the fair value of plan assets compared to the actuarial value of future
benefit obligations. However, the retirement benefit costs relating to our qualified defined benefit
pension and postretirement benefit plans are generally recovered in utility rates which are set based on
accounting standards for pensions and postretirement benefits, and as such we received approval from
the OPUC pursuant to regulatory accounting to recognize the overfunded or underfunded status as a
regulatory asset or regulatory liability based on expected rate recovery, rather than including it as
AOCI under common equity (see “Regulatory Accounting”, above, and Note 2, “Industry
Regulation”).

The retirement benefit cost for pensions consists of service costs, interest costs, the expected

returns on plan assets, and the amortization of actuarial gains and losses. Effective January 1, 2011, we
began deferring a portion of our pension expense to a regulatory account on the balance sheet pursuant
to OPUC approval of pension expenses above or below the amount set in rates. In 2011, the cumulative
amount deferred for future pension cost recovery was $6.0 million. The regulatory asset account earns
a carrying cost at the authorized cost of capital rate set by the OPUC.

A number of factors are considered in developing pension and postretirement assumptions,

including evaluations of relevant discount rates, an evaluation of expected long-term investment
returns based on asset classes and target asset allocations, expected changes in salaries and wages,
analyses of past retirement plan experience and current market conditions and input from actuaries and
other consultants. For the December 31, 2011 measurement date, we reviewed and updated:

•

•

•

•

our weighted-average discount rate assumptions for pensions and other postretirement
benefits, which went from 5.49 percent to 4.51 percent and from 5.16 percent to 4.33
percent, respectively. The new rate assumptions were determined for each plan based on a
matching of benchmark interest rates to the estimated cash flows, which reflects the timing
and amount of future benefit payments. Benchmark interest rates are drawn from the
Citigroup Above Median Curve, which consists of high quality bonds rated AA- or higher
by Standard & Poor’s (S&P) or Aa3 or higher by Moody’s Investors Service (Moody’s);
our expected annual rate of future compensation increases, which remained unchanged at a
range of 3.25 to 5.0 percent;
our expected long-term return on qualified defined benefit plan assets, which was reduced
to 8.00 percent from 8.25 percent; and
other key assumptions, which were based on actual experience and actuarial
recommendations.

51

At December 31, 2011, our net pension liability (benefit obligations less market value of plan

assets) for the two qualified defined benefit plans increased $51.5 million compared to 2010. The
increase in our net pension liability is primarily due to the $48.4 million increase in our pension
obligation. The liability for non-qualified plans increased $3.3 million and the liability for other
postretirement benefits increased $2.4 million in 2011.

We determine the expected long-term rate of return on plan assets by averaging the expected
earnings for the target asset portfolio. In developing our expected return, we evaluate an analysis of
historical actual performance and long-term return projections, which gives consideration to the current
asset mix and our target asset allocation. As of December 31, 2011, the actual annualized returns on
plan assets, net of management fees, for the past one-year, five-years, 10-years and since inception
were 2.4 percent, 0.2 percent, 4.8 percent and 9.9 percent, respectively.

We believe our pension assumptions to be appropriate based on plan design and an assessment
of market conditions. However, the following shows the sensitivity of our retirement benefit costs and
benefit obligations to future changes in certain actuarial assumptions:

Thousands, except percent

Discount rate:

Qualified defined benefit plans
Non-qualified plans
Other postretirement benefits

Expected long-term return on plan assets:

Qualified defined benefit plans

Accounting for Income Taxes

Change in
Assumption

(0.25%)

(0.25%)

Impact on 2011
Retirement
Benefit Costs

Impact on Retirement
Benefit Obligations
at Dec. 31, 2011

$1,162
8
54

580

$11,796
53
754

N/A

We account for income taxes in accordance with accounting standards that require the
recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary
differences between financial statement carrying amount and tax basis of assets and
liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to
taxable income in the years in which those temporary differences are expected to be recovered or
settled. At December 31, 2011 and 2010, our net long-term deferred tax liability totaled $413.2 million
and $373.4 million, respectively. After application of the federal statutory tax rate to book income,
judgment is required with respect to the timing and deductibility of expense in our tax returns. For state
income tax and local income taxes, judgment is also required with respect to the apportionment among
the various jurisdictions. A valuation allowance is recorded if we expect that it is “more likely than
not” that our deferred tax assets will not be realized. At December 31, 2011, we did not have a
valuation allowance due to our expectation that all of these assets and liabilities will be realized.

These accounting standards also require the recognition of deferred income tax assets and

liabilities for temporary differences where regulators require us to flow through deferred income tax
benefits or expenses in the ratemaking process of the regulated utility (regulatory tax assets and
liabilities). This is consistent with the ratemaking policies of the OPUC and WUTC. Regulatory tax
assets and liabilities are recorded to the extent we believe they will be recoverable from, or refunded to,
customers in future rates. At December 31, 2011 and 2010, we had regulatory assets representing
differences between book and tax basis related to pre-1981 property of $68.5 million and $72.3 million,

52

respectively, and recorded an offsetting deferred tax liability. We received authorization from the OPUC
and WUTC in 2009 to accelerate the recovery of these pre-1981 regulatory assets through future utility
rates. See Notes 2 and 10.

Uncertain tax positions are accounted for in accordance with accounting standards that require

management’s assessment of the expected treatment of a tax position taken in a filed tax return, or
planned to be taken in a future tax return, that has not been reflected in measuring income tax expense
for financial reporting purposes. Until such positions are sustained by the taxing authorities, we would
not recognize the tax benefits resulting from such positions and would report the tax effect as a liability
in the Company’s consolidated balance sheet. As of December 31, 2011, we had no uncertain tax
positions.

The IRS completed its examination of the 2006 through 2008 tax years in 2011. The

examination resulted in payments of $1.5 million of tax and $0.2 million of interest. The Oregon
Department of Revenue (ODOR) completed its field examination of our 2006 through 2009
consolidated Oregon income tax returns and issued preliminary assessments. If sustained by the
ODOR, these assessments would result in an additional state tax liability of approximately $0.8
million, including interest and penalties. The Company is engaged in discussions with ODOR to
resolve these issues; however, uncertainty exists with respect to the outcome of the audit as a result of
information not yet fully considered by the ODOR. Resolution is expected to be reached within the
next 12 months, and we have determined that it is more-likely-than-not that we will prevail on these
issues. As such, no amounts have been recorded in our financial statements as of December 31, 2011
related to this matter.

Interest and penalties related to any future income tax deficiencies are recorded in income tax

expense in our consolidated statements of income.

Accounting for Contingencies

Loss contingencies are recorded as liabilities when it is probable that a liability has been

incurred and the amount of the loss is reasonably estimable in accordance with accounting standards
for contingencies. Estimates of loss contingencies, including estimates of legal costs when such costs
are probable of being incurred and are reasonably estimable and related disclosures are updated when
new information becomes available. Estimating probable losses requires an analysis of uncertainties
that often depend upon judgments about potential actions by third parties. Accruals for loss
contingencies are recorded based on an analysis of potential results. When information is sufficient to
estimate only a range of potential liabilities, and no point within the range is more likely than any
other, we recognize an accrued liability at the low end of the range and disclose the range (see
“Contingent Liabilities,” below). It is possible, however, that the range of potential liabilities could be
significantly different than amounts currently accrued and disclosed, with the result that our financial
condition and results of operations could be materially affected by changes in the assumptions or
estimates related to these contingencies.

With respect to environmental liabilities and related costs, we develop estimates based on a

review of information available from numerous sources, including completed studies and site specific
negotiations. Using sampling data, feasibility studies, existing technology and enacted laws and
regulations, we estimate that the total future expenditures for environmental investigation, monitoring
and remediation are $72.7 million as of December 31, 2011. It is our policy to accrue the full amount
of such liability when information is sufficient to reasonably estimate the amount of probable liability.

53

When information is not available to reasonably estimate the probable liability, or when only the range
of probable liabilities can be estimated and no amount within the range is more likely than another,
then it is our policy to accrue at the lower end of the range. Accordingly, due to numerous uncertainties
surrounding the course of environmental remediation and the preliminary nature of several site
investigations, in some cases, we may not be able to reasonably estimate the high end of the range of
possible loss. In those cases we have disclosed the nature of the potential loss and the fact that the high
end of the range cannot be reasonably estimated.

We will continue to seek recovery of such costs through insurance and through customer rates,
and we believe recovery of these costs is probable. If it is determined that both the insurance recovery
and future rate recovery of such costs are not probable, the costs will be charged to expense in the
period such determination is made. See Note 15.

Results of Operations

Regulatory Matters

Regulation and Rates

Utility. We are subject to regulation with respect to, among other matters, rates and systems of

accounts set by the OPUC, WUTC, and FERC. The OPUC and WUTC also regulate our issuance of
securities by the utility. In 2011, approximately 90 percent of our utility gas volumes and revenues
were derived from Oregon customers and approximately 10 percent from Washington customers.
Future earnings and cash flows from utility operations will be determined by the Oregon and
Washington economies in general, by the pace of growth in the residential and commercial markets in
particular, and by our ability to remain price competitive, control expenses, and obtain reasonable and
timely regulatory recovery for our utility gas costs, including operating and maintenance expenses and
investment costs made in utility plant and other regulatory assets.

Gas Storage. Our gas storage business is subject to regulation with respect to, among other

matters, issuance of securities and systems of accounts set by the OPUC, FERC, and the CPUC. The
CPUC regulates Gill Ranch under a market based rates model which allows for the price for storage
services to be set by market conditions. The OPUC and FERC regulate intrastate and interstate storage
services, respectively, under a maximum cost of service model which allows for storage prices to be
set at or below the cost of service as set in the last approved regulatory filing for each agency. In 2011,
approximately 65 percent of our storage revenues were derived from FERC and Oregon approved rates
to customers and approximately 35 percent from California approved rates to customers.

General Rate Cases

Oregon. On December 30, 2011, we filed an application for a general rate increase at the

OPUC. In the filing, we have requested an increase in authorized annual Oregon jurisdictional
revenues of $43.7 million, equivalent to a rate increase of 6.2 percent. The amount and percent of this
rate increase includes an estimated $15.1 million that represents the cumulative effect of declining use
per customer. This cost is already included in customers’ current rates through the operation of the
Company’s conservation tariff, which has been in place since 2003. The increase also includes costs
related to pension contributions and additional utility services. The filing also requests an authorized
overall rate of return on capital of 8.28 percent, with a return on common stock equity (ROE) of 10.3
percent and a capital structure of 50 percent common equity. In addition, we have requested the
establishment of rate recovery mechanisms for deferred costs related to our environmental

54

liabilities. The filing also requests rate redesign for residential customers with a higher fixed fee, which
would effectively combine and incorporate the effects of the weather normalization and decoupling
tariffs in the new fixed fee amount. The new rates are requested to be effective by November 1,
2012. We are unable to predict the outcome of this rate proceeding.

Our most recent general rate case in Oregon was effective September 2003. The OPUC
authorized rates to customers based on an ROE of 10.2 percent. In 2007, in connection with the
renewal of our conservation tariff and weather normalization rate mechanism, the OPUC approved a
stipulation that restricted us from filing a general rate case in Oregon prior to September 2011.
However, in 2011 the OPUC approved our gas reserve acquisition (see “Rate Mechanisms—Gas
Reserves” below) with a condition that we file a general rate case by the end of 2011. These
agreements did not impact our requirement to file annual rate adjustments to reflect changes in gas
purchase costs under the PGA mechanism or our ability to collect or refund prior year’s gas cost
deferrals. See “Rate Mechanisms—Purchased Gas Adjustment,” below.

Washington. Our most recent general rate case in Washington was in 2008, and in it the
WUTC authorized rates to customers based on an ROE of 10.1 percent and an overall rate of return of
8.4 percent. These customer rates went into effect on January 1, 2009, with annual revenue
requirements increased by $2.7 million or 3 percent.

FERC Jurisdiction. We are required under our Mist interstate storage certificate authority and

rate approval orders to file every five years either a petition for rate approval or a cost and revenue
study to change or justify maintaining the existing rates for our interstate storage services. Our most
recent filing of a cost and revenue study was in April 2008. As a result of that proceeding, the current
maximum cost-based rates for our interstate gas storage services were approved by FERC, with
maximum rates unchanged from prior levels approved by FERC in 2005. In addition, we made a filing
in December 2008 to obtain FERC approval to revise the depreciation rates associated with Mist assets
used to derive the cost-based interstate storage rates. These new depreciation rates were designed to
match the depreciation rates for the same type of assets approved under state regulation. We did not
make any changes to the previously approved maximum rates, and FERC approved the depreciation
rate filing in May 2009. We are required to make our next cost and revenue study filing at FERC on or
before December 11, 2013.

California. Gill Ranch is authorized by the CPUC to charge market-based rates for the

intrastate storage services offered to customers in California.

Rate Mechanisms

Purchased Gas Adjustment. Rate changes are established for the utility each year under PGA

mechanisms in Oregon and Washington to reflect changes in the expected cost of natural gas
commodity purchases, including contract gas purchase prices, gas prices hedged with financial
derivatives or physical gas reserves, gas inventory prices, interstate pipeline demand costs, the
application of temporary rate adjustments to amortize balances in deferred regulatory accounts and the
removal of temporary rate adjustments effective for the previous year.

In October 2011, the OPUC and WUTC approved PGA rate changes effective November 1,

2011. The effect of these rate changes was to decrease the average monthly bills of Oregon and
Washington residential customers by about 2 percent. This was our third consecutive year of PGA rate
decreases, and cumulatively our average utility residential customer bills declined 20 percent in
Oregon and 26 percent in Washington since 2008.

55

Under the current PGA mechanism in Oregon, there is an incentive sharing provision whereby
we are required to select each year either an 80 percent or 90 percent deferral of higher or lower actual
gas costs compared to estimated PGA prices, such that the impact on current earnings from the
incentive sharing is either 20 percent or 10 percent of the difference between actual and estimated gas
costs, respectively. In addition to the gas cost incentive sharing mechanism, we are subject to an annual
earnings test to determine if the utility is earning above its authorized ROE threshold. If utility earnings
exceed a specific ROE level, then 33 percent of the amount above that level is required to be deferred
for refund to customers. Under this provision, if we select the 80 percent deferral option, then we retain
all of our earnings up to 150 basis points above the currently authorized ROE. If we select the 90
percent deferral option, then we retain all of our earnings up to 100 basis points above the currently
authorized ROE. We selected the 90 percent deferral option for the 2009-10, the 2010-2011 and the
2011-2012 PGA years. The ROE threshold is subject to adjustment annually based on movements in
long-term interest rates. For calendar years 2009 and 2010, the ROE threshold after adjustment for
long-term interest rates was 11.5 percent and 11.02 percent, respectively. No amounts were required to
be refunded to customers as a result of the 2009 utility earnings test, while we are refunding $0.2
million to customers in the current PGA for the 2010 utility earnings test. For 2011, we accrued an
estimated $1.5 million for potential refund to customers in the next PGA.

There has been no change to the Washington PGA mechanism under which we defer 100
percent of the higher or lower actual gas costs, with those cost differences passed on to customers
through an adjustment to future rates.

Gas Reserves. In April, 2011 the OPUC approved the Encana gas reserve transaction for utility
customers and determined that the Company’s costs under the agreement will be recovered, plus a rate
base return on our investment, on an ongoing basis through our annual PGA mechanism, including the
regulatory deferral and incentive sharing process for the commodity cost of gas. Annually, a forecast
will be established for the amounts related to costs and volumes expected, and any variances between
forecasted and actual results will be subject to our PGA incentive sharing in Oregon, up to a maximum
variance of $10 million of which 10 percent (or $1 million maximum) would be recognized in current
income. Variances in excess of $10 million, both negative and positive, will be deferred and passed
through to customers in future rates at 100 percent.

Conservation Tariff. In October 2002, the OPUC authorized the implementation of a
“conservation tariff” to adjust utility margin for changes in consumption patterns due to residential and
commercial customers’ conservation efforts. The conservation tariff is a decoupling mechanism that is
intended to break the link between utility earnings and the quantity of gas consumed by customers,
removing any financial incentive by the utility to discourage customers’ efforts to conserve energy. In
Washington, customer use is not covered by a conservation or decoupling tariff, and as such our utility
earnings are affected by increases and decreases in usage based on customers’ conservation
efforts. Washington customers account for about 10 percent of our utility volumes and revenues.

The Oregon conservation tariff includes two components: (1) an annual price elasticity

adjustment, which adjusts rates for increases or decreases from expected customer volumes due to
changes in commodity costs or changes in our general rates; and (2) a monthly conservation
adjustment, which adjusts margin revenues to account for the difference between actual and expected
customer volumes (also referred to as the decoupling adjustment). The margin adjustment resulting
from differences between actual and expected volumes under the decoupling component is recorded to
a deferral account, which is included in the next annual PGA filing. Baseline consumption was
determined by customer consumption data used in the 2003 Oregon general rate case and is adjusted

56

annually for customer growth and the effect of the price elasticity adjustment discussed above. From
2003 to 2011, we have experienced approximately 14 percent decline in average use per residential
customer and approximately 8 percent decline in average use per commercial customer. As a result of
these declines, customers have paid surcharges related to a decoupling adjustment in seven of the past
nine heating seasons. See “Business Segments—Utility Operations,” below.

In 2005, an independent study was commissioned to measure the effectiveness of Oregon’s

conservation tariff mechanism. The results of this study recommended continuation of the tariff with
minor modifications. The tariff modifications were approved by the OPUC, and the mechanism was
extended through October 2012.

Weather Normalization Tariff. In Oregon, we have an approved weather normalization

mechanism applied to residential and commercial customer bills. This mechanism is designed to help
stabilize the collection of fixed costs by adjusting residential and commercial customer billings based
on temperature variances from average weather, with rate decreases when the weather is colder than
average and rate increases when the weather is warmer than average. The mechanism is applied to bills
between December 1 and May 15 of each heating season. The mechanism adjusts the margin
component of customers’ rates to reflect average weather, which uses the 25-year average temperature
for each day of the billing period. Daily average temperatures and 25-year average temperatures are
based on a set point temperature of 59 degrees Fahrenheit for residential customers and 58 degrees
Fahrenheit for commercial customers (see “Business Segments—Utility Operations,” below). The
weather normalization mechanism for Oregon utility operations is approved through October 2012.
Customers in Oregon are allowed to opt out of the weather normalization mechanism, and as of
December 31, 2011, 9 percent had opted out. We do not have a weather normalization mechanism
approved for Washington customers, which account for about 10 percent of our utility volumes and
revenues.

Industrial Tariffs. The OPUC and WUTC approve tariffs covering utility service to our major

industrial customers, including terms which are intended to give us certainty in the level of gas
supplies we need to acquire to serve this customer group. The terms include, among other things, an
annual election period, special pricing provisions for out-of-cycle changes, and a requirement that
industrial customers under our annual PGA tariff complete the term of their service election.

System Integrity Program. Since 2002, various laws requiring minimum standards for
integrity management programs and system integrity programs (SIP) for natural gas distribution
pipelines have been enacted. Most recently, in January 2012 the “Pipeline Safety, Regulatory
Certainty, and Job Creation Act of 2011” was signed into law and requires increased civil penalties for
pipeline safety violations, improvements in prevention programs for pipelines, and additional review
and analysis of various aspects of gas transmission lines. We are working diligently with industry
associations and federal and state regulators to ensure NW Natural’s compliance with the provisions of
this new law.

The OPUC has approved specific accounting treatment and cost recovery for our transmission
pipeline integrity management program, SIP, and the related rules adopted by the U.S. Department of
Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA). We record the
costs related to the integrity management program as either capital expenditures or regulatory assets,
accumulate the costs over each 12-month period, and recover the revenue requirement associated with
the costs, subject to audit, through rate changes effective with the annual PGA in Oregon. Our SIP
costs are tracked into rates annually, with rate recovery after the first $3.3 million of capital costs. An

57

annual cap for expenditures has been set at $12 million, but extraordinary costs above the cap may be
approved with written consent of the OPUC staff and other interested parties and approval of the
OPUC. The SIP allows recovery of costs incurred in Oregon during the period from October 2008
through the effective date of our next general rate case. We do not have any special accounting or rate
treatment for our SIP costs incurred in the state of Washington.

Environmental Costs. The OPUC has authorized us to defer environmental costs associated

with certain named sites and to accrue a carrying cost on environmental costs paid, subject to an annual
demonstration that we have maximized our insurance recovery or made substantial progress in
securing insurance recovery for unrecovered environmental expenses. Through a series of extensions,
the authorized cost deferral and accrual of carrying costs was extended through January 2012. In
January 2012, we filed a request with the OPUC to continue our deferral of these environmental costs.
See Note 15 for further discussion of our regulatory and insurance recovery of environmental costs.

The WUTC has also authorized the deferral of environmental costs, if any, that are incurred in

connection with services provided to Washington customers. The order granting approval of that
request was effective January 26, 2011.

Pension Deferral. Effective January 1, 2011, the OPUC approved our request to defer annual

pension expenses above the amount set in rates in our last general rate case, with recovery of these
deferred amounts through the implementation of a balancing account, which includes the expectation
of higher and lower pension expenses in future years. Our recovery of these deferred balances includes
accrued interest on the account balance at the utility’s authorized rate of return, which is currently 8.62
percent. The reduction to operations and maintenance expense for 2011 was $6.0 million. Future years’
deferrals will depend on changes in plan assets and projected benefit liabilities using a number of key
assumptions, as well as our pension contributions. We estimate deferrals totaling $8 million to $9
million in 2012. See “Application of Critical Accounting Policies and Estimates,” above.

Customer Credits for Gas Storage Sharing. In June 2011, $12.5 million was credited to

Oregon utility customers from our regulatory incentive sharing mechanism related to gas storage and
asset management services of pipeline capacity and gas storage at Mist (see “Gas Storage,” below). In
June 2010, we credited $11.0 million to customers under the same regulatory sharing mechanism. Our
Washington utility customers receive their respective share of this credit as part of the annual PGA
filing. In November 2011, a $0.9 million credit was placed in Washington utility customer rates for
these activities, compared to a $1.2 million credit to Washington customers in November 2010.

Business Segments—Utility Operations

Utility net operating revenues (margins) are affected by customer growth, and to a certain

extent, by changes in volume due to weather and customer consumption patterns because a significant
portion of our revenues are derived from natural gas sales to residential and commercial customers. In
Oregon, we have a conservation tariff, which adjusts revenues to offset changes in margin resulting
from increases or decreases in average use by residential and commercial customers, and a weather
normalization tariff, which adjusts to offset changes in margin resulting from above- or below-average
temperatures during the winter heating season (see “Results of Operations—Regulatory Matters—Rate
Mechanisms,” above). Both the conservation and weather normalization mechanisms have the effect of
reducing the volatility of our utility earnings. We also have other regulatory mechanisms, which
increase or decrease utility margins to account for other costs and revenues approved by the OPUC or
WUTC. See “Results of Operations—Regulatory Matters—Rate Mechanisms,” below.

58

2011 compared to 2010:

Our utility segment in 2011 earned $60.5 million, or $2.26 per share, compared to $66.3
million, or $2.49 per share in 2010. The major factors contributing to the change was a $14.9 million
reduction in utility margins related to the repealed Oregon legislative rule on utility income taxes paid,
including of a $7.4 million write-off in 2011 plus a $7.7 million revenue accrual recognized in 2010,
and a net gain of $6.1 million recognized in 2010 related to a refund of property taxes plus accrued
interest from a favorable tax ruling. These were partially offset by increases in residential and
commercial customer margins of $11.3 million, including the effects of weather normalization and
decoupling mechanisms, a slight gain in industrial customer margins of $0.2 million, and an increase in
gas cost incentive sharing of $0.5 million. Total utility volumes sold and delivered in 2011 increased 9
percent over last year primarily due to the impact of colder weather on residential and commercial use.

Our weather normalization mechanism adjusted residential and commercial margins down by
$13.1 million for the year ended December 31, 2011 based on weather that was 9 percent colder than
average, compared to a margin increase of $14.0 million for the year ended December 31, 2010 when
weather was 2 percent warmer than average. Our decoupling mechanism adjusted residential and
commercial margins up by $19.3 million in 2011, after adjusting for expected price elasticity impacts
from lower PGA prices effective November 1, 2010, compared to margin adjustments up by $15.5
million in 2010.

2010 compared to 2009:

Our utility segment in 2010 earned $66.3 million, or $2.49 per share, compared to $66.0
million, or $2.48 per share in 2009. The major factors contributing to the change were reduced
operating expenses largely offset by lower utility margins. The lower margins consisted of a $13.5
million decrease from the prior year’s gas cost incentive sharing, partially offset by a net $5 million
increase from residential and commercial customers, including the effects of the weather normalization
and decoupling mechanisms, and a $0.7 million increase in industrial margin. Total utility volumes
sold and delivered in 2010 decreased by 6 percent over last year due to the effects of warmer weather
on residential and commercial use and the lingering effects of a weak economy on commercial and
industrial use. The regulatory adjustment for income taxes paid increased margin by $1.8 million
compared to 2009.

Our weather normalization mechanism adjusted residential and commercial margins up by

$14.0 million for the year ended December 31, 2010 based on weather that was 2 percent warmer than
average, compared to a margin reduction of $15.2 million for the year ended December 31, 2009 when
weather was 3 percent colder than average. Our decoupling mechanism adjusted residential and
commercial margins up by $15.5 million in 2010, after adjusting for expected price elasticity impacts
from lower PGA prices effective November 1, 2009, compared to margin adjustments totaling $11.6
million in 2009.

59

The following table summarizes the composition of gas utility volumes and revenues for the

years ended December 31, 2011, 2010 and 2009:

Thousands, except degree day and
customer data

Utility volumes—therms:
Residential sales
Commercial sales
Industrial—firm sales
Industrial—firm transportation
Industrial—interruptible sales
Industrial—interruptible transportation

Total utility volumes sold and delivered

Utility operating revenues—dollars:
Residential sales
Commercial sales
Industrial—firm sales
Industrial—firm transportation
Industrial—interruptible sales
Industrial—interruptible transportation
Regulatory adjustment for income taxes paid (1)
Other revenues

Total utility operating revenues

Cost of gas sold
Revenue taxes

Utility margin

Utility margin: (2)
Residential sales
Commercial sales
Industrial—sales and transportation
Miscellaneous revenues
Gain (loss) from gas cost incentive sharing
Other margin adjustments

Margin before regulatory adjustments

Weather normalization adjustment
Decoupling adjustment
Regulatory adjustment for income taxes paid (1)

Utility margin

Customers—end of period:
Residential customers
Commercial customers
Industrial customers

Total number of customers—end of period

Actual degree days

2011

2010

2009

425,139
259,675
37,344
129,898
59,308
240,990
1,152,354

368,682
230,196
37,085
127,796
58,387
239,823
1,061,969

412,867
255,593
39,447
124,218
72,525
226,715
1,131,365

$ 492,490 $ 456,174 $ 555,844
292,697
41,407
5,671
62,116
7,964
5,884
21,166
992,749
611,088
24,656
$ 342,970 $ 346,148 $ 357,005

244,922
30,455
6,250
34,961
9,169
(7,162)
11,134
822,219
458,508
20,741

227,994
30,830
5,702
36,164
8,131
7,721
17,917
790,633
424,494
19,991

$ 222,526 $ 197,045 $ 217,124
85,850
27,713
6,670
15,064
2,308
354,729
(15,236)
11,628
5,884
$ 342,970 $ 346,148 $ 357,005

86,971
28,635
4,875
2,107
(1,173)
343,941
(13,106)
19,297
(7,162)

77,831
28,451
4,658
1,594
(647)
308,932
13,996
15,499
7,721

615,670
62,948
925
679,543

610,598
62,489
910
673,997

604,692
62,169
933
667,794

4,652

4,171

4,383

Favorable/(Unfavorable)

2011
vs. 2010

2010
vs. 2009

56,457
29,479
259
2,102
921
1,167
90,385

$ 36,316
16,928
(375)
548
(1,203)
1,038
(14,883)
(6,783)
31,586
(34,014)
(750)
$ (3,178)

$ 25,481
9,140
184
217
513
(526)
35,009
(27,102)
3,798
(14,883)
$ (3,178)

5,072
459
15
5,546

(44,185)
(25,397)
(2,362)
3,578
(14,138)
13,108
(69,396)

$ (99,670)
(64,703)
(10,577)
31
(25,952)
167
1,837
(3,249)
(202,116)
186,594
4,665
$ (10,857)

$ (20,079)
(8,019)
738
(2,012)
(13,470)
(2,955)
(45,797)
29,232
3,871
1,837
$ (10,857)

5,906
320
(23)
6,203

Percent colder (warmer) than average weather (3)

9%

(2)%

3%

(1) Regulatory adjustment for income taxes paid is described below.
(2) Amounts reported as margin for each category of customers are net of cost of gas sold and revenue taxes.
(3) Average weather represents the 25-year average degree days, as determined in our last Oregon general rate

case.

60

Residential and Commercial Sales

The primary factors that impact results of operations in the residential and commercial markets
are customer growth, seasonal weather patterns, energy prices, competition from other energy sources
and economic conditions in our service areas. Typically, 80 percent or more of our annual utility
operating revenues are derived from gas sales to weather-sensitive residential and commercial
customers. Although variations in temperatures between periods will affect volumes of gas sold to
these customers, the effect on margin and net income is significantly reduced due to our weather
normalization mechanism in Oregon where about 90 percent of our customers are served. For more
information on our weather mechanism, see “Regulatory Matters—Rate Mechanisms—Weather
Normalization,” above.

The primary changes that impacted margin from residential and commercial sales were as

follows:

2011 compared to 2010:

•

•

•

utility volumes were 14 percent higher, primarily reflecting 12 percent colder weather; sales
volumes to core utility customers are sensitive to weather variations especially in the
winter-heating season;
utility operating revenues increased $53.2 million or 8 percent primarily due to the 14
percent volume increase;
utility margin increased $11.3 million or 4 percent primarily due to customer growth of 0.8
percent and colder weather, with colder weather benefits partially offset by weather
normalization adjustments that reduce customer bills and Company margins when weather
is colder than average.

2010 compared to 2009:

•

•

•

utility volumes were 10 percent lower, primarily reflecting 5 percent warmer weather,
conservation efforts and weak economic conditions;
utility operating revenues decreased $164.4 million or 19 percent primarily due to the 10
percent volume decline and customer rate decreases of 16 and 22 percent in Oregon and
Washington, respectively, effective November 1, 2009; and
utility margin increased $5 million or 2 percent primarily due to customer growth of 0.9
percent and the colder weather in the spring of 2010 that was not entirely offset by
Oregon’s weather normalization mechanism.

61

Industrial Sales and Transportation

Operating revenues from industrial customers include the commodity cost component of gas

sold under sales service but not under transportation service. Therefore, operating revenues from
industrial customers can increase or decrease when customers switch between sales service and
transportation service, but generally our margins from these customers are unaffected by these changes
because we do not generally include a profit mark-up for the cost of gas. As such, we believe volumes
delivered and margins are better measures of performance for the industrial sector. The primary
changes that impacted margin from industrial sales and transportation were as follows:

2011 compared to 2010:

•

volumes delivered to industrial customers increased 4.4 million therms, or 1 percent,
reflecting increased energy demand, with the majority of the increased volume attributable
to the manufacturing sector; and

• margins increased $0.2 million, or 1 percent.

2010 compared to 2009:

volumes delivered to industrial customers increased 0.2 million therms; and

•
• margin increased $0.7 million, or 3 percent.

The slight margin increases in 2011 and 2010 were primarily due to an increase in industrial

use of natural gas as a result of higher costs for oil and propane fuels, which caused some customers to
switch to natural gas. Partially offsetting this trend was the loss of a few large industrial customers due
to the economy.

Regulatory Adjustment for Income Taxes Paid

From 2007 through 2010, Oregon law required the Company and certain regulated natural gas

and electric utilities to annually review the amount of income taxes collected in rates from utility
operations and compare it to the amount the utility actually pays to taxing authorities. Under this law,
if the amount paid for income taxes related to utility operations is less than the amount collected from
Oregon utility customers, then we were required to refund the excess to Oregon utility customers.
Conversely, if the amount paid in income taxes was more than the amount collected from Oregon
utility customers, then we were required to collect a surcharge from Oregon utility customers.

The Company’s income tax review resulted in a surcharge to customers each year SB 408 was

in effect. For 2009, the OPUC approved the Company’s recovery of $5.1 million plus interest from
customers. For the 2010 tax year, we originally estimated and accrued $7.1 million. However, when
SB 967 was signed into law in May of 2011, it effectively repealed the regulatory adjustment for
income taxes paid for the 2010 tax year and all years thereafter, thus resulting in the Company
recording a $7.4 million write-off in the second quarter of 2011 to write-off the amount from SB 408,
plus interest, related to 2010 tax year. Results related to SB 408 for 2011 were a pre-tax loss of $7.4
million, compared to pre-tax gains of $7.7 million in 2010 and $5.9 million in 2009.

SB 967 requires the OPUC to make decisions in future ratemaking proceedings on the amounts

of income taxes to be recovered in customer rates. For additional information, see “Revenue
Recognition” above under Application of Critical Accounting Policies and Estimates.

62

Other Revenues

Other revenues include miscellaneous fee income as well as regulatory revenue adjustments,

which reflect current period deferrals to and prior year amortizations from, regulatory asset and
liability accounts, except for gas cost deferrals which flow through cost of gas sold. Other revenues
increased utility margins by $11.1 million in 2011, compared to $17.9 million in 2010 and $21.2
million in 2009.

2011 compared to 2010:

Other revenues decreased $6.8 to $11.1 million in 2011 primarily reflecting a decrease in the

amortization of decoupling adjustments totaling $5.9 million and a decrease in other regulatory
amortizations of $4.6 million, partially offset by a $1.0 million increase in the refund to utility
customers related to gas storage incentive sharing mechanism and an increase in the current decoupling
deferral of $3.8 million.

Decoupling amortizations and other regulatory amortizations from prior year deferrals are
included in current or future revenues from residential, commercial and industrial firm customers.

2010 compared to 2009:

Other revenues decreased $3.2 to $17.9 in 2010 primarily reflecting an increase in the
amortization of decoupling adjustments totaling $7.9 million, partially offset by a $4.0 million increase
in the refund to utility customers related to gas storage incentive sharing mechanism.

Cost of Gas Sold

The cost of gas sold includes gas purchases, gas drawn from storage inventory, gains and losses

from commodity hedges, pipeline demand costs, seasonal demand cost balancing adjustments,
regulatory gas cost deferrals, production from gas reserves, and company gas use. The OPUC and the
WUTC generally require the natural gas commodity costs to be billed to customers at the same cost
incurred or expected to be incurred by the utility. We have not historically earned a profit or incurred a
loss on gas commodity purchases; however, in Oregon we have an incentive sharing provision
whereby we can either increase or decrease margin revenues from gas cost variances as compared to
gas costs embedded in the PGA. Under this provision, our net income can be affected by differences
between actual and expected purchased gas costs, which occur primarily because of market
fluctuations and volatility affecting unhedged gas purchases. In addition, we recently entered into a
regulatory agreement where we receive a rate base return on our investment in gas reserves. (see
“Regulatory Matters—Rate Mechanisms—Purchased Gas Adjustment and Regulatory Matters—Rate
Mechanisms—Gas Reserves,” above). We use natural gas commodity-based hedge contracts
(derivatives), primarily fixed-price commodity swaps, consistent with our financial derivatives policies
to help manage our exposure to rising gas prices. Gains and losses from financial hedge contracts are
generally included in our PGA prices and normally do not impact net income because the hedge prices
are usually 100 percent passed through to customers in annual rate changes, subject to a regulatory
prudency review. However, utility hedge contracts entered into after the annual PGA rates are set in
Oregon can impact net income because we would be required to share in any gains or losses compared
to the corresponding commodity prices included in rates in the PGA. In Washington, 100 percent of the
actual gas costs, including hedge gains and losses allocated to Washington gas sales, are passed

63

through in customer rates (see “Application of Critical Accounting Policies and Estimates—
Accounting for Derivative Instruments and Hedging Activities,” and “Regulatory Matters—Rate
Mechanisms—Purchased Gas Adjustment,” above, and Note 15). The following summarizes the major
factors that contributed to changes in cost of gas sold:

2011 compared to 2010:

•

•

•

total cost of gas sold increased $34 million, or 8 percent, due to an 9 percent increase in
total sales volumes partially offset by a 4 percent decrease in the average cost of gas sold
per therm;
the average gas cost collected through rates decreased from 61 cents per therm in 2010 to
59 cents per therm in 2011, primarily reflecting lower commodity prices that were passed
through to PGA rate decreases effective November 1, 2010 and 2011; and
hedge losses totaling $56.5 million were realized and included in cost of gas sold for the
year ended December 31, 2011, compared to $61.0 million of hedge losses in the same
period of 2010.

2010 compared to 2009:

•

•

•

total cost of gas sold decreased $186.6 million, or 31 percent, due to a 6 percent decrease in
total sales volumes and a 22 percent decrease in the average cost of gas sold per therm;
the average gas cost collected through rates decreased from 78 cents per therm in 2009 to
61 cents per therm in 2010, primarily reflecting lower commodity prices that were passed
through to PGA rate decreases effective November 1, 2009 and 2010; and
hedge losses totaling $61.0 million were realized and included in cost of gas sold for the
year ended December 31, 2010, compared to $187.9 million of hedge losses in the same
period of 2009.

Actual gas costs in both 2011 and 2010 were slightly below those embedded in rates, while in
2009 actual gas costs were significantly lower. The effect on shareholders from the gas cost incentive
sharing mechanism was a contribution to margin of $2.1 million in 2011, $1.6 million in 2010 and
$15.1 million in 2009. For a discussion of our gas cost incentive sharing mechanism, see “Regulatory
Matters—Rate Mechanisms—Purchased Gas Adjustment,” above.

Gas Storage

Our gas storage segment consists of the non-utility portion of our Mist underground storage

facility and our 75 percent ownership interest in the Gill Ranch facility. For the year ended
December 31, 2011, we earned $4.1 million, or 15 cents per share, from gas storage compared to $6.1
million, or 23 cents per share, for 2010. The primary reason for the decline was lower storage pricing
driven by lower, more stable gas costs.

At Mist, we provide gas storage services to customers in the interstate and intrastate markets

primarily using storage capacity that has been developed in advance of core utility customers’
requirements. Under a regulatory incentive sharing mechanism in Oregon, we retain 80 percent of
pre-tax income from Mist gas storage services, and from asset management services, when the
underlying costs of the capacity being used are not included in our utility rates, and 33 percent of
pre-tax income from such storage and asset management services when the capacity being used is

64

included in utility rates. The remaining 20 percent and 67 percent, respectively, are credited to a
deferred regulatory account for credit to our core utility customers. We have a similar sharing
mechanism in Washington for pre-tax income derived from gas storage and asset management
services.

Our 75 percent undivided ownership interest in the Gill Ranch facility is held by our wholly-
owned subsidiary Gill Ranch, which is also the operator of the project. Our portion of the facility is
currently designed to provide 15 Bcf of gas storage capacity by the end of 2012. Gill Ranch
commenced operations at the end of October 2010 and had approximately 13 Bcf of storage capacity
available for contracting to customers beginning April 1, 2011, which was the beginning of the first
full storage injection season at Gill Ranch, after a partial injection season, which commenced in
October 2010. See Note 4.

Other

Our other business segment consists of NNG Financial, an investment in PGH, and other

non-utility investments and business activities. NNG Financial had total assets of $1.1 million as of
both December 31, 2011 and 2010 primarily reflecting a non-controlling minority interest in the Kelso-
Beaver interstate gas transmission pipeline. Our equity investment in PGH as of December 31, 2011
and 2010 was $13.5 million and $14.8 million, respectively. Total earnings from our other business
segment as of December 31, 2011 and 2010 was a net loss of $0.7 million and net income of $0.3
million, respectively. The loss for 2011 was primarily due to approximately $1.3 million of charges on
our investment in PGH. See Note 4.

Consolidated Operations

Operations and Maintenance

Operations and maintenance expense was $125.3 million in 2011, compared to $121.0 million

in 2010, an increase of $4.3 million or 4 percent. The following summarizes the major factors that
contributed to changes in operations and maintenance expense:

2011 compared to 2010:

•

•

•

•

•

a $3.2 million increase in operating expenses at Gill Ranch related to the first full year of
operations;
a $2.3 million increase in utility payroll expense related to additional field support staff and
general pay increases;
a $1.2 million increase in utility health care costs and other related employee benefit
expense (see further discussion below);
a $1.5 million increase in other non-payroll expense at the utility for costs related to the
general rate case of $0.7 million, storage leases of $0.3 million, and pipeline integrity and
corporate ethics initiatives of $0.2 million; and
a $0.2 million increase in utility bad debt expense (see further discussion below).

Partially offsetting the above factors were:

•

a $1.8 million decrease in performance bonuses at the utility based on below-target results
compared to last year;

65

•

•

a $1.5 million decrease in pension expense due to the regulatory deferral of costs above the
amount net in rates (see further discussion below); and
a $1.0 million decrease in specific consulting and legal fees which were incurred by the
utility in 2010 related to our successful property tax appeal.

2010 compared to 2009:

•

•
•

•

•

a $5.6 million decrease in utility payroll expense related to a reduced number of employees.
There was a reduction of 105 employees or 9 percent over the two year period beginning
January 2009;
a $2.4 million decrease in utility bad debt expense (see further discussion below);
a $1.9 million decrease in pension expense, due to the increase in market value of plan
investments from contributions in 2009 and 2010;
a $1.5 million decrease in health care and other employee benefit expense due to reduced
employee count, offset by an increase in healthcare premiums (see further discussion
below); and
a $0.2 million decrease in damage claims in 2010.

Partially offsetting the above increases were:

•

•

a $4.9 million increase in gas storage expenses, primarily related to start-up costs including
salaries and benefits, power costs, legal fees and investment bank consulting costs; and
a $1.0 million increase for consulting and legal fees at the utility related to a successful
property tax appeal.

Our bad debt expense as a percent of revenues was 0.23 percent for the year ended

December 31, 2011, compared to 0.21 percent for the same period last year. The comparative increase
in our bad debt expense ratio was largely due to lower than normal expense ratio in 2010 due to
improved collections and higher recoveries of delinquent account balances. Despite the modest
increase, we believe bad debt losses are comparable to last year and credit risks remain elevated due to
the weak economy and high unemployment rates. Higher customer usage from colder weather these
past few months may increase our exposure to credit losses in the near term, but we expect bad debt
expense over the long term to remain below 0.5 percent of revenues.

Overall national healthcare spending has slowed as a result of the weak economy; however,
healthcare trends for the cost of the services provided are forecasted to continue to rise at around 10
percent to 11 percent year over year. Initial projections for increases to employer paid premiums for
2012 are estimated to be between 7 percent and 9 percent. Based on our actual premium increase for
2012, NW Natural’s employer paid portion of health premiums (medical, dental, vision) are expected
to increase 6 percent.

In addition, total pension costs are expected to increase in 2012. However, effective January 1,
2011 the OPUC approved the deferral of utility pension expense above the amount recovered in rates,
which was set in our last general rate case. The pension expense deferral is recorded to a regulatory
balancing account, which reduced operations and maintenance expense by $6.0 million for 2011, and
we expect additional cost deferrals to the pension balancing account in 2012 at or above the levels of
2011. For further explanation of the pension balancing account, see “Regulatory Matters—Rate
Mechanisms—Pension Deferral,” above.

66

General Taxes

General taxes, which are principally comprised of property and payroll taxes and regulatory

fees, increased $5.4 million, or 23 percent, in 2011 compared to 2010, and decreased $4.4 million, or
16 percent, in 2010 compared to 2009. The major factors that contributed to changes in general taxes
are:

2011 compared to 2010:

•

•

a $5.2 million increase due to the refund of property taxes in 2010 pursuant to a favorable
ruling from the Oregon Supreme Court regarding taxation of utility gas inventory held for
sale (see further discussion below); and
a $1.3 million increase in property taxes at Gill Ranch as a result of the first full year of
operations.

2010 compared to 2009:

•

a $5.2 million decrease due to the refund of property taxes received in 2010, as mentioned
above, partially offset by an increase in property taxes related to a 2 percent increase in net
utility plant balances.

Prior to 2011, we had been involved for a number of years in litigation with the ODOR over

whether inventories held for sale were required to be taxed as personal property. In January 2010, the
Oregon Supreme Court unanimously ruled in our favor, stating that these inventories were exempt
from property tax. As a result of this ruling, we were entitled to a refund of approximately $5.2 million,
plus accrued interest, for property taxes paid on inventories beginning with the 2002-03 tax year. We
recognized a net $6.1 million increase in pre-tax income in the first quarter of 2010, which consisted of
$5.2 million for the refund of property taxes, $1.9 million for accrued interest income, and $1.0 million
of increased operations and maintenance expense for legal and consulting services. We received all of
the property tax refunds in 2010.

Depreciation and Amortization

Total depreciation and amortization expense in 2011 increased by $4.9 million, or 7 percent, as

compared to a $2.3 million or 4 percent increase in 2010 over 2009. The increased expense in 2011
was primarily related to an increase of $3.7 million in Gill Ranch’s depreciation, plus additional
depreciation on investments in utility plant for customer growth and system improvements. The
increased expense in 2010 was primarily related to $1.1 million of depreciation at Gill Ranch as they
went into service in the fourth quarter of 2010, plus additional depreciation on investments in utility
plant.

67

Other Income and Expense—Net

The following table provides details on other income and expense—net for the last three years:

Thousands

Gains from company-owned life insurance
Interest income
Income (loss) from equity investments
Net interest on deferred regulatory accounts
Gain (loss) on sale of investments
Other non-operating

Total other income and expense—net

2011 compared to 2010:

2011

2010

2009

$ 2,247
50
(1,641)
5,999
(96)
(2,036)

$ 2,042
2,024
588
4,692
223
(2,467)

$ 3,416
211
1,329
2,051
45
(3,338)

$ 4,523

$ 7,102

$ 3,714

Other income and expense—net decreased $2.6 million, primarily due to $1.9 million of

interest income received from the property tax refund in 2010 which did not occur in 2011, a $1.4
million loss from equity investments due to Palomar charges (see Note 12), partially offset by a $1.3
million increase in interest and carrying costs from regulatory account balances largely due to smaller
balances in gas costs between 2011 and 2010. See discussion of Palomar in “Strategic Opportunities—
Pipeline Diversification” above.

2010 compared to 2009:

Other income and expense—net increased $3.4 million, primarily due to $1.9 million of interest

income related to property tax refund plus a $2.6 million increase in interest from regulatory account
balances largely due to smaller balances in gas costs between 2010 and 2009, partially offset by a $1.4
million decrease in income from life insurance due to higher policy gains realized in 2009.

Interest Expense—Net

Interest expense—net of amounts capitalized in 2011 decreased by $0.5 million, or 1 percent,

compared to 2010, and increased in 2010 by $1.9 million, or 5 percent, compared to 2009. The current
year decrease was primarily due to a $1.9 million savings from interest expense on long-term debt as a
result of bonds that were redeemed in 2010, partially offset by a $1.1 million increase for gas storage
interest expense related to the Gill Ranch base gas agreement, as well as the issuance of $50 million of
3.176 percent medium term notes (MTN’s) in September 2011 and the issuance of $40 million of
subsidiary senior secured notes with an average interest rate of 7.38 percent for Gill Ranch in
November 2011. The increases in 2010 compared to 2009 reflect the issuance of long-term debt during
2009, which included $75 million of 5.37 percent MTN’s issued in March 2009 and $50 million of
3.95 percent MTN’s issued in July 2009, and higher short-term debt balances. Interest expense also
reflects a lower average interest rate used in calculating the allowance for funds used during
construction, which is referred to as AFUDC. AFUDC rates, comprised of short-term and long-term
capital costs as appropriate, were 0.5 percent in 2011, 0.6 percent in 2010 and 1.0 percent in 2009.

Income Tax Expense

The decrease in income tax expense of $6.1 million, or 12 percent, compared to 2010 was

primarily due to lower pre-tax consolidated earnings. Effective tax rate for 2011 and 2010 was 40.4
percent, compared to 40.5 percent in 2010 and 38.3 percent in 2009. Income tax expense increased
$2.8 million, or 6 percent, for the year ended December 31, 2010 compared to 2009, primarily due to
higher pre-tax consolidated earnings and a slightly higher effective tax rate.

68

For the 2011 tax year, the lower effective tax rate was primarily due to a decrease in state tax

expense (see further discussion below). For the 2010 tax year, the higher effective tax rate was
primarily the result of increased amortization of our regulatory tax account on pre-1981 utility plant
assets (see “Regulatory Matters—Rate Mechanisms,” above) and a lower non-taxable gain on
company-owned life insurance. For more information on our income taxes, including a reconciliation
between the statutory federal and state income tax rates and the effective rate, see Note 2 and Note 10.

In July 2009, the governor of Oregon signed House Bill 3405 establishing increases in the state

income tax rate for corporations, and Oregon voters approved this legislation in January 2010. The
corporate income tax rate in Oregon increased from 6.6 percent to 7.9 percent for tax years 2009 and
2010 when taxable income was greater than $250,000. For tax years 2011 and 2012, the state income
tax rate decreased to 7.6 percent, and for years after 2012 the tax rate will return to 6.6 percent, except
for corporations with taxable income over $10 million the tax rate will remain at 7.6 percent.
Following existing accounting guidance on income taxes, we re-measured our deferred income tax
assets and liabilities, resulting in an adjustment to increase the balance by $3.6 million in
2009. Approximately $3.5 million of the adjustment was attributed to our utility operations. As we
anticipate future recovery in rates, we recorded a regulatory asset for the grossed up revenue
requirement. With respect to our non-utility business segments, a $0.1 million adjustment was charged
to income tax expense in 2009. In 2010 we decreased the deferred income tax liability by $0.8 million
as a result of the decrease from 7.9 percent to 7.6 percent. This decrease was almost entirely
attributable to the utility business.

Financial Condition

Capital Structure

One of our long-term goals is to maintain a strong consolidated capital structure, generally
consisting of 45 to 50 percent common stock equity and 50 to 55 percent long-term and short-term
debt. When additional capital is required, debt or equity securities are issued depending upon both the
target capital structure and market conditions. These sources of financing are also used to fund long-
term debt redemptions and short-term commercial paper maturities (see “Liquidity and Capital
Resources,” below, and Notes 7 and 8). Achieving the target capital structure and maintaining
sufficient liquidity to meet operating requirements are necessary to maintain attractive credit ratings
and have access to capital markets at reasonable costs. Our consolidated capital structure was as
follows for the years ended December 31, 2011 and 2010:

Common stock equity
Long-term debt
Short-term debt, including current maturities of long-term debt

Total

Liquidity and Capital Resources

December 31,

2011

46.5%
41.7%
11.8%

100%

2010

44.7%
38.1%
17.2%

100%

At December 31, 2011, we had $5.8 million of cash and cash equivalents, compared to $3.5

million at December 31, 2010. We also had $4.0 million in restricted cash at Gill Ranch as of
December 31, 2011, which is being held as collateral for long-term debt outstanding, compared to $0.9
million as of December 31, 2010, which was being held as collateral for equipment purchase contracts

69

and construction loans. In order to maintain sufficient liquidity during periods of volatile capital
markets, at times we will maintain higher cash balances, add short-term borrowing capacity, and
potentially pre-fund utility capital expenditures when long-term fixed rate environments are
attractive. As a regulated entity, our issuance of equity securities and most forms of debt securities are
subject to approval by the OPUC and WUTC, and our use of proceeds from utility specific issuances
are restricted to certain utility purposes. Our use of retained earnings is not subject to those same
restrictions.

For the utility segment, our short-term liquidity is supported by cash balances, internal cash

flow from operations, proceeds from the sale of commercial paper notes, borrowings from multi-year
credit facilities, cash available from surrender value in company-owned life insurance policies, and
proceeds from the sale of long-term debt. We use utility long-term debt proceeds to finance utility
capital expenditures, refinance maturing debt of the utility and provide for general corporate purposes
of the utility.

Capital markets over the past few years, including the commercial paper market, experienced

significant volatility and tight credit conditions, but conditions have been improving as reflected by
tighter credit spreads and increased access to new financing for investment grade issuers. With our
current debt ratings (see “Credit Ratings,” below), we have been able to issue commercial paper and
MTNs at attractive rates and have not needed to borrow from our back-up credit facilities. In the event
that we are not able to issue new debt due to market conditions, we expect that our near term liquidity
needs can be met by using cash balances or, for the utility segment, drawing upon our committed credit
facilities. We also have a universal shelf registration filed with the SEC for the issuance of secured and
unsecured debt or equity securities, subject to market conditions and regulatory approvals. As of
December 31, 2011, we have OPUC approval to issue up to $125 million of additional MTNs under
the existing shelf registration for approved purposes.

In the event that our senior unsecured long-term debt credit ratings are downgraded, or our

outstanding derivative position exceeds a certain credit threshold, our counterparties under derivative
contracts could require us to post cash, a letter of credit or other form of collateral, which could expose
us to additional cash requirements and may trigger significant increases in short-term borrowings. If
the credit risk-related contingent features underlying these contracts were triggered on December 31,
2011, we could have been required to post up to $45.9 million of collateral to our counterparties, but
that assumes our long-term debt ratings were downgraded to non-investment grade levels, which would
be a very significant change from current rating levels for NW Natural (see Note 13 and “Credit
Ratings,” below).

Additionally, in July 2010, the U.S. Congress passed and President Obama signed into law the

“Wall Street Reform and Consumer Protection Act.” The legislation requires additional government
regulation of derivative and over-the-counter transactions, and could expand collateral requirements.
While we continue to evaluate the legislation to determine its impact, if any, on our hedging
procedures, results of operations, financial position and liquidity, we do not expect to know the full
impact of the legislation until final regulations implementing the legislation are issued.

Recent developments that may have a significant impact on our liquidity and capital resources
include pension contribution requirements, tax benefits, and environmental expenditures and insurance
recoveries. With respect to pension requirements, we expect to make significant contributions over the
next seven years until we are fully funded under the Pension Protection Act rules (see “Pension Cost

70

and Funding Status of Qualified Retirement Plans,” below). With respect to federal income tax
liabilities, an extension was granted that allows us to take 100 percent bonus depreciation on qualified
expenditures during 2011, and 50 percent bonus depreciation on a majority of our capital expenditures
in 2012, which will significantly reduce our tax liability for the 2011 and 2012 tax years thereby
providing cash flow benefits in late 2012 and 2013 (see “Cash Flows—Operating Activities,” below).
With respect to environmental liabilities, we expect to continue using cash resources to fund our
environmental liabilities, but we also anticipate recovering amounts through insurance or utility rates
over the next several years, although the amount and timing of these expenditures and recoveries is
uncertain (see Note 15).

Our storage segment’s short-term liquidity is supported by cash balances, internal cash flow
from operations, external financing, and to a certain extent on funding from its parent company. Gill
Ranch has a limited operational history, having begun operations in October 2010. Although we
anticipate operating cash flows to be sufficient for liquidity purposes, the amount and timing of these
cash flows are uncertain. In November 2011, Gill Ranch issued $40 million of senior secured notes,
with fixed interest rate component on $20 million and a variable interest rate on the remaining $20
million. The average combined interest rate on the notes was 7.38 percent per annum in 2011. These
notes are secured by our membership interest in Gill Ranch Storage, LLC, and are nonrecourse to NW
Natural. The maturity date of these notes is November 30, 2016.

Under the note agreements, Gill Ranch is subject to certain covenants and restrictions,

including but not limited to, a financial covenant that requires Gill Ranch to maintain minimum
adjusted EBITDA at various levels over the term of the notes. The minimum adjusted EBITDA
increases incrementally over the first few years, reaching its highest level in the 12-month period
beginning April 1, 2015. Under the agreements, Gill Ranch is also subject to a debt service reserve
requirement of 10 percent of the outstanding principal amount, initially $4 million, certain prepayment
penalties, restrictions on dividends out of Gill Ranch unless certain earnings ratios are met, and
restrictions on incurrence of additional debt.

Based on several factors, including our current credit ratings, our commercial paper program,

current cash reserves, committed credit facilities, and our expected ability to issue long-term debt
under our universal shelf registration, we believe our liquidity is sufficient to meet anticipated near-
term cash requirements, including all contractual obligations and investing and financing activities
discussed below.

Dividend Policy

We have paid quarterly dividends on our common stock each year since the stock was first

issued to the public in 1951. Annual common stock dividend payments per share, adjusted for stock
splits, have increased each year since 1956. The amount and timing of dividends payable on our
common stock is within the sole discretion of our Board of Directors. Subject to Board approval, we
expect to continue paying quarterly cash dividends on common stock. However, the declarations and
amount of future dividends will depend upon our earnings, cash flows, financial condition and other
factors including Board approval.

Off-Balance Sheet Arrangements

Except for certain lease and purchase commitments (see “Contractual Obligations,” below), we

have no material off-balance sheet financing arrangements.

71

Contractual Obligations

The following table shows our contractual obligations at December 31, 2011 by maturity and

type of obligation.

Thousands

Payments Due in Years Ending December 31,
2016
2014
2012

2013

2015

Thereafter

Total

Commercial paper
Long-term debt maturities
Interest on long-term debt
Postretirement benefit payments (1)
Capital leases
Operating leases
Gas purchases (2)
Gas pipeline commitments
Gas reserves (3)
Other purchase commitments

$141,600 $
40,000
39,056
21,430
443
4,929
98,534
94,491
59,040
-

- $
-
38,145
21,703
313
4,841
18,331
87,983
51,660
157

- $

- $

- $

60,000
37,984
22,245
118
5,078
15,290
82,898
49,200
82

40,000
36,489
22,789
23
5,042
5,651
72,316
41,820
37

65,000
33,518
23,482
-
5,018
-
61,358
-
-

- $ 141,600
681,700
413,503
245,627
897
49,567
137,806
686,587
201,720
13,835

476,700
228,311
133,978
-
24,659
-
287,541
-
13,559

Total

$499,523 $223,133 $272,895 $224,167 $188,376 $1,164,748 $2,572,842

(1)

The majority of postretirement benefit payments are related to our qualified defined benefit pension plans, which are
funded by plan assets and future cash contributions. See Note 9.

(2) Gas purchases include contracts which use price formulas tied to monthly index prices, plus hedged derivative

liabilities. Commitment amounts are based on futures prices as of December 31, 2011. For a summary of derivatives/
liabilities, see Note 13. For a summary of gas purchase commitments, see Note 15.

(3) Gas reserves contracts include provisions for cancelation, under which further payment would not be required.

Other purchase commitments primarily consist of remaining balances under existing purchase

orders. These and other contractual obligations are financed with cash from operations and from
issuance of short-term debt, which is periodically refinanced through the sale of long-term debt or
equity securities.

At December 31, 2011, 598 of our utility employees were members of the Office and
Professional Employees International Union Local No. 11. In July 2009, these union employees and
the Company agreed to a new five-year labor agreement called the Joint Accord. The Joint Accord
provides for a one percent automatic wage increase each year, plus the potential for us to an additional
two percent based on wage inflation and other factors. It also provides competitive health benefits
while limiting the cost increases for these benefits to the same level as the annual wage increases. The
term of the new Joint Accord extends to May 31, 2014, and thereafter from year to year unless either
party serves notice of its intent to negotiate modifications to the collective bargaining agreement.

Short-Term Debt

Our primary source of utility short-term liquidity is from internal cash flows and the sale of

commercial paper. In addition to issuing commercial paper to meet working capital requirements,
including seasonal requirements to finance gas inventories and accounts receivable, short-term debt
may also be used to temporarily fund utility capital requirements. Commercial paper is periodically
refinanced through the sale of long-term debt or equity securities. Our outstanding commercial paper,
which is sold through two commercial banks under an issuing and paying agency agreement, is
supported by one or more unsecured revolving credit facilities (see “Credit Agreements,” below). Our
commercial paper program did not experience any liquidity disruptions as a result of the credit
problems that affected issuers of asset-backed commercial paper and certain other commercial paper

72

programs over the last several years. At December 31, 2011 and 2010, our utility had commercial
paper outstanding of $141.6 million and $257.4 million, respectively. The effective interest rate on the
utility’s commercial paper outstanding at December 31, 2011 and 2010 was 0.3 percent and 0.4
percent, respectively.

In March 2009, Gill Ranch entered into a cash collateralized credit facility for up to $40

million, which was extended through September 30, 2010. In June 2010, Gill Ranch repaid its $40
million bank loan outstanding using the proceeds from its cash collateralized account. The effective
interest rate on the Gill Ranch credit facility was 0.8 percent during 2010.

Credit Agreements

We have a syndicated multi-year credit agreement for unsecured revolving loans totaling $250

million. The original term of this credit agreement was extended through May 31, 2013. All lenders
under our syndicated agreement are major financial institutions with committed balances and
investment grade credit ratings as of December 31, 2011 (see table below). We also had three bilateral
credit agreements totaling $50 million in effect from November 30, 2010 through March 31, 2011 for
seasonal working capital needs.

Lender rating, by category

AAA/Aaa
AA/Aa
A/A
BBB/Baa

Total

Loan Commitment
(In Thousands)
Syndicated
Facility

-
$
230,000
20,000
-

$250,000

Based on credit market conditions, it is possible that one or more lending commitments could
be unavailable to us if the lender defaulted due to lack of funds or insolvency. However, based on our
current assessment of our lenders’ creditworthiness, including a review of capital ratios, credit default
swap spreads and credit ratings, we believe the risk of lender default is minimal.

As discussed above, we extended commitments with all of our lenders under the $250 million

syndicated agreement through May 31, 2013. This syndicated agreement also allows us to request
increases in the total commitment amount from time to time, up to a maximum amount of $400
million. This syndicated agreement also permits the issuance of letters of credit in an aggregate amount
up to the applicable total borrowing commitment.

Any principal and unpaid interest amounts owed on borrowings under the credit agreements are
due and payable on or before the maturity date. There were no outstanding balances under these credit
agreements at December 31, 2011 and 2010. These agreements require us to maintain a consolidated
indebtedness to total capitalization ratio of 70 percent or less. Failure to comply with this covenant
would entitle the lenders to terminate their lending commitments and accelerate the maturity of all
amounts outstanding. We were in compliance with this covenant at December 31, 2011 and 2010, with
consolidated indebtedness to total capitalization ratios of 53.5 percent and 55.4 percent, respectively.

73

The syndicated agreement also requires that we maintain credit ratings with S&P and Moody’s

and notify the lenders of any change in our senior unsecured debt ratings by such rating agencies. A
change in our debt ratings by S&P or by Moody’s is not an event of default, nor is the maintenance of a
specific minimum level of debt rating a condition of drawing upon the credit agreement. However, a
change in our debt rating below BBB- by S&P or Baa3 by Moody’s would require additional approval
from the OPUC prior to issuance of utility debt, and interest rates on any loans outstanding under the
credit agreements are tied to debt ratings, which would increase or decrease the cost of any loans under
the credit agreements when ratings are changed (see “Credit Ratings,” below).

Credit Ratings

Our debt credit ratings are a factor in our liquidity, affecting our access to the capital markets,

including the commercial paper market. Our debt credit ratings also have an impact on the cost of
funds and the need to post collateral under derivative contracts. A change in our ratings below BBB-
by S&P or Baa3 by Moody’s would require additional approval from the OPUC prior to our issuing
additional long-term debt.

The following table summarizes our NW Natural debt ratings from S&P and Moody’s at

December 31, 2011:

Commercial paper (short-term debt)
Senior secured (long-term debt)
Senior unsecured (long-term debt)
Corporate credit rating
Ratings outlook

S&P

A-1
A+
n/a
A+
Stable

Moody’s

P-1
A1
A3
n/a
Stable

The above credit ratings are dependent upon a number of factors, both qualitative and

quantitative, and are subject to change at any time. The disclosure of these credit ratings is not a
recommendation to buy, sell or hold NW Natural securities. Each rating should be evaluated
independently of any other rating.

Redemptions of Long-Term Debt

We redeemed MTN’s during 2011, 2010 and 2009 as follows:

Thousands (Years ended December 31)

Medium-Term Notes

6.65% Series B due 2027 (1)
4.11% Series B due 2010
7.45% Series B due 2010
6.665% Series B due 2011

Amounts Redeemed

2011

2010

2009

$

-
-
-
10,000

$

-
10,000
25,000
-

$10,000

$35,000

$300
-
-
-

$300

(1)

In November 2009, $0.3 million of our 6.65 percent secured MTNs due 2027 were redeemed pursuant to a one-time put
option. This one-time put option has now expired, and the $19.7 million remaining principal outstanding is expected to
be paid at maturity in November 2027.

74

Cash Flows

Operating Activities

2011 compared to 2010:

For the year ended December 31, 2011, cash flow from operating activities totaled $233.5

million compared to $126.5 million in 2010 and $240.3 million in 2009. The significant factors
contributing to changes in operating cash flow in 2011 compared to 2010 are as follows:

•

•

•

•

•

•

•

an increase of $85.7 million from accrued taxes, primarily related to bonus depreciation
which resulted in federal tax refunds of $36.6 in 2011 and a net operating loss (NOL)
carryforward;
an increase of $34.7 million from changes in deferred gas costs, which reflects a higher
level of gas cost savings which will be refunded to utility customers in subsequent years’
PGA;
an increase of $33.4 million from insurance recoveries for environmental claims, net of
deferred environmental expenditures in 2011;
an increase of $12.0 million from changes in accounts payable due to decreased
construction activity at Gill Ranch;
a decrease of $29.5 million from changes in deferred tax liabilities primarily reflecting
higher tax benefits in 2010 compared to 2011, largely driven by utility and Gill Ranch
bonus depreciation for investments placed in service during 2010;
a decrease of $22.1 million from changes in receivables primarily due to higher balances at
the end of 2009, which benefitted cash flows during 2010; and
a decrease of $12.0 million from higher pension contributions due to a decline in interest
rates and asset values, which increased pension funding requirements.

In September 2010, Congress passed the Unemployment Insurance, Reauthorization and Job
Creation Act of 2010 (the Jobs Act) and the legislation was signed into law by President Obama. The
Jobs Act extended for one year the temporary bonus depreciation rules first enacted in the Economic
Stimulus Act of 2008 and subsequently renewed in the American Recovery and Reinvestment Act of
2009. Under the bonus depreciation provision, and additional first-year tax deduction was allowed for
depreciation equal to 50 percent of the adjusted basis of qualified property through September 8, 2010,
in the year the property was placed in service, with the remaining percentage recovered under the
normal depreciation rules. In addition, on December 17, 2010, President Barack Obama signed into
law the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 (the Tax
Relief Act), which allows 100 percent bonus depreciation for qualified property placed in service
between September 9, 2010 through December 31, 2011. It also extended the 50 percent bonus
depreciation deduction to qualifying property placed in service in 2012. As a result of this legislation,
we generated a tax net operating loss in 2010 which was carried back to the tax year 2009, resulting in
a federal income tax refund of $22.3 million which we received in 2011. We also recognized an
increase in our cash flow by reducing our current tax liabilities for the 2011 and 2012 tax years. As of
December 31, 2011, we have a federal and state income tax receivable balance of $7.0 million, which
we expect to realize in cash flows during 2012.

75

2010 compared to 2009:

•

•
•
•

•

•

•

•

an increase of $39.6 million from deferred income taxes, primarily reflecting higher tax
benefits from bonus depreciation taken in 2010 related to Gill Ranch capital investments
placed in service;
an increase of $15.0 million from a smaller pension contribution in 2010 compared to 2009;
an increase of $10.1 million from the 2009 settlement of an interest rate hedge;
a decrease of $75 million from accrued taxes, primarily related to 2010 benefits that will be
refunded in 2011, and due to tax refunds received in 2009 related to a change in tax
accounting method for repairs and maintenance costs;
a decrease of $62.9 million from changes in deferred gas cost regulatory account which
reflects actual gas prices compared to estimated gas prices embedded in customer rates;
a decrease of $19.7 million from changes in receivables primarily due to higher balances at
the end of 2008, which benefitted cash flows during 2009;
a decrease of $14.5 million from changes in inventories primarily due to higher price of gas
in inventory at the end of 2008, which benefitted cash flows during 2009 as higher cost
inventories were recovered through utility rates; and
a decrease of $13.0 million in accounts payable due to decreased Gill Ranch construction
activity at the end of 2010 compared to the end of 2009.

We have lease and purchase commitments relating to our operating activities that are financed

with cash flows from operations. For information on cash flow requirements related to leases and other
purchase commitments, see “Contractual Obligations,” above and Note 15.

Investing Activities

Cash used in investing activities for the year ended December 31, 2011 totaled $153.1 million,
down from $212.9 million for the same period in 2010. Our capital expenditures were $100.5 million
in the year ended December 31, 2011, down from $248.5 million for the same period in 2010. Capital
expenditures decreased in non-utility construction activity in 2011, which were largely due to Gill
Ranch construction expenditures in 2010. We also invested $50.6 million in utility gas reserves in 2011
under the agreement with Encana discussed earlier.

Restricted cash decreased $37.7 million compared to 2010, due to settling our $40 million cash

collateralized loan in June 2010, partially offset by a $4 million restricted cash collateral requirement
imposed under the new Gill Ranch debt issued in 2011 (see Financing Activities, below).

Over the five-year period 2012 through 2016, total utility capital expenditures are estimated to

be between $400 and $500 million and utility expenditures for gas reserves are estimated to be $200
million. The estimated level of utility capital expenditures over the next five years reflects assumptions
for customer growth, storage development for the utility, technology investments and utility
distribution improvements, including requirements under current pipeline safety programs. Most of the
required funds are expected to be internally generated over the five-year period, and any remaining
funding will be obtained through the issuance of long-term debt or equity securities, with short-term
debt providing liquidity and bridge financing.

In 2012, we expect to spend less than $15 million on non-utility development projects,

including the storage businesses and Palomar. Storage business capital expenditures in 2012 are

76

expected to be paid primarily from working capital, and potentially with additional funds from NW
Natural. Palomar expects to continue working on revised plans for the east pipeline segment, including
plans to conduct an open season to re-evaluate regional needs. The initial planning and permitting costs
have been financed with equity funds from NW Natural and our partner, TransCanada American
Investments Ltd. For more information, see Note 12 and “Strategic Opportunities—Pipeline
Diversification,” above.

Financing Activities

Cash used in financing activities for the year ended December 31, 2011 totaled $78.0 million,

down significantly from cash provided of $81.4 million for the same period in 2010. Our short-term
debt balances decreased $115.8 million for the year ended December 31, 2011, compared to an
increase of $155.4 million for the same period in 2010. We also redeemed $10 million of long-term
debt in June of 2011. This was offset by long-term debt issuances of $50 million in September 2011 by
the utility and $40 million in November 2011 by Gill Ranch. We continue to use long-term debt
proceeds primarily to finance capital expenditures, refinance short-term and long-term debt maturities
as well as for general corporate purposes.

We have a repurchase program approved through May 2011 which provides authorization to

repurchase up to 2.8 million shares of NW Natural common stock or up to $100 million. The purchases
are made in the open market or through privately negotiated transactions. No repurchases were made in
2011, 2010 or 2009 under the program. Since the program’s inception, we have repurchased an
aggregate 2.1 million shares of common stock at a total cost of $83.3 million, at the average price of
$39.19 per share (see Part II, Item 5, “Market for the Registrant’s Common Equity, Related
Stockholder Matters and Issuer Purchases of Equity Securities,” above).

Free Cash Flow

Free cash flow is the amount of cash remaining after the payment of all cash expenses, capital

expenditures and investment activities, and dividends. Free cash flow is a non-GAAP financial
measure, but we believe this supplemental information enables the reader of the financial statements to
better understand our cash generating ability of the Company and to benefit from seeing cash flow
results from management’s perspective in addition to the traditional GAAP presentation. We monitor
free cash flow as one measure of our return on investments. Provided below is a reconciliation from
cash provided by operations (GAAP basis) to our non-GAAP free cash flow.

Thousands

Cash provided by operating activities
Cash used in investing activities
Cash dividend payments on common stock

Free cash flow

2011

2010

2009

$ 233,462
(153,065)
(46,690)

$ 126,469
(212,871)
(44,652)

$ 240,335
(162,141)
(42,415)

$ 33,707

$(131,054) $ 35,779

The free cash flow information presented above is not intended to be a substitute for, nor is it

meant to be a better measure of, cash flow results prepared in accordance with GAAP. In addition, the
non-GAAP measure we provide may be calculated differently by other companies that present a
similar non-GAAP financial measure for cash flow.

77

Pension Cost and Funding Status of Qualified Retirement Plans

Pension costs are determined in accordance with accounting standards for compensation and
retirement benefits (see “Application of Critical Accounting Policies and Estimates—Accounting for
Pensions and Postretirement Benefits,” above). Pension costs for our two qualified defined benefit
plans, which are allocated between operation and maintenance expenses, capital expenditures and the
deferred regulatory balancing account totaled $16.3 million in 2011, an increase of $4.9 million from
2010. See Note 9 for additional details.

The fair market value of pension assets in these two plans decreased to $216.0 million at

December 31, 2011 from $219.0 million at December 31, 2010. The decrease was due to a negative
return on plan assets of $6.7 million and benefit payments of $16.6 million, offset by $20.2 million in
employer contributions.

We make contributions to company-sponsored qualified defined benefit pension plans based on

actuarial assumptions and estimates, tax regulations and funding requirements under federal law. Our
qualified defined benefit pension plans were underfunded by $146.9 million at December 31, 2011. We
plan to make contributions during 2012 of approximately $28 million. For more information on the
funding status of our qualified retirement plans and other postretirement benefits, see Note 9.

We also contribute to a multiemployer pension plan for our employees (the Union Plan, or

otherwise known as Western States Plan) pursuant to our collective bargaining agreement. We made
contributions totaling $0.4 million to the Union Plan in both 2011 and 2010. See Note 9 for further
disclosures.

Ratios of Earnings to Fixed Charges

For the years ended December 31, 2011, 2010 and 2009, our ratios of earnings to fixed charges,

computed using the Securities and Exchange Commission method, were 3.41, 3.73, and 3.86,
respectively. For this purpose, earnings consist of net income before taxes plus fixed charges, and fixed
charges consist of interest on all indebtedness, the amortization of debt expense and discount or
premium and the estimated interest portion of rentals charged to income. See Exhibit 12.

Contingent Liabilities

Loss contingencies are recorded as liabilities when it is probable that a liability has been

incurred and the amount of the loss is reasonably estimable in accordance with accounting standards
for contingencies (see “Application of Critical Accounting Policies and Estimates,” above). At
December 31, 2011, we had a regulatory asset of $105.7 million for deferred environmental costs. If it
is determined that both the insurance recovery and future customer rate recovery of such costs are not
probable, then the costs will be charged to expense in the period such determination is made. For
further discussion of contingent liabilities, see Note 15.

New Accounting Pronouncements

For a description of recent accounting pronouncements that may have an impact on our

financial condition, results of operations or cash flows, see Note 2.

78

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to various forms of market risk including commodity supply risk, commodity

price risk, interest rate risk, foreign currency risk, credit risk and weather risk. The following describes
our exposure to these risks.

Commodity Supply Risk

We enter into spot, short-term and long-term natural gas supply contracts, along with associated
pipeline transportation contracts, to manage our commodity supply risk. Historically, we have arranged
for physical delivery of an adequate supply of gas, including gas in our Mist storage facility, to meet
the expected requirements of our core utility customers. Our gas purchase contracts are primarily
index-based and subject to monthly re-pricing, a strategy that is intended to reflect market price trends
during the upcoming year.

Commodity Price and Storage Value Risk

Natural gas commodity prices and storage values are subject to market fluctuations due to
unpredictable factors including weather, pipeline transportation congestion, drilling technologies,
potential market speculation and other factors that affect short-term supply and demand. In addition to
managing storage positions through a combination of short- and long-term fixed price contracts, we
use commodity-price financial swap and option contracts (financial hedge contracts) to convert certain
natural gas supply contracts from floating prices to fixed or capped prices, and physical gas reserves
from a long-term investment with Encana, for utility gas purchase requirements. These financial hedge
contracts and gas reserve volumes are generally included in our annual PGA filing for recovery,
subject to a regulatory prudence review. We also regularly monitor and manage the financial exposure
and liquidity risk of our storage position.

Interest Rate Risk

We are exposed to interest rate risk primarily associated with new debt financing needed to
fund capital requirements, including future contractual obligations and maturities of long-term and
short-term debt. Interest rate risk is primarily managed through the issuance of fixed-rate debt with
varying maturities. We may also enter into financial derivative instruments, including interest rate
swaps, options and other hedging instruments, to manage and mitigate interest rate exposure.

Foreign Currency Risk

The costs of certain natural gas commodity supplies and certain pipeline services purchased

from Canadian suppliers are subject to changes in the value of the Canadian currency in relation to the
U.S. currency. Foreign currency forward contracts are used to hedge against fluctuations in exchange
rates for our commodity and commodity related demand charges paid in Canadian dollars. At
December 31, 2011 and 2010, notional amounts under foreign currency forward contracts totaled $12.3
million and $13.9 million, respectively. As of December 31, 2011 , all foreign currency forward
contracts mature within one year. If all of the foreign currency forward contracts had been settled on
December 31, 2011, a loss of $0.2 million would have been realized (see Note 13).

79

Credit Risk

Credit exposure to suppliers. Certain suppliers that sell us gas have either relatively low
credit ratings or are not rated by major credit rating agencies. To manage this supply risk, we purchase
gas from a number of different suppliers at liquid exchange points. We evaluate and monitor suppliers’
creditworthiness and maintain the ability to require additional financial assurances, including deposits,
letters of credit or surety bonds, in case a supplier defaults. In the event of a supplier’s failure to deliver
contracted volumes of gas, the regulated utility would need to replace those volumes at prevailing
market prices, which may be higher or lower than the original transaction prices. We believe these
costs would be subject to the PGA sharing mechanism discussed above. Since most of our commodity
supply contracts are priced at the monthly market index price tied to liquid exchange points, and we
have significant storage flexibility, we believe that it is unlikely that a supplier default would have an
adverse effect on our financial condition or results of operations.

Credit exposure to financial derivative counterparties. Based on estimated fair value at
December 31, 2011, our overall credit exposure relating to commodity hedge contracts is considered to
be immaterial as it reflects amounts we owed to our financial derivative counterparties totaling $63.5
million. However, changes in natural gas prices could result in counterparties owing us money.
Therefore our financial derivatives policy requires counterparties to have at least an investment-grade
credit rating at the time the derivative instrument is entered into, and specific limits on the contract
amount and duration based on each counterparty’s credit rating. Due to potential changes in market
conditions and credit concerns, we continue to enforce strong credit requirements. We actively monitor
and manage our derivative credit exposure and place counterparties on hold for trading purposes or
require cash collateral, letters of credit or guarantees as circumstances warrant. As of December 31,
2011, we do not have any actual derivative credit risk exposure, which reflects amounts that financial
derivative counterparties owe to us.

The following table summarizes our overall credit exposure, based on estimated fair value, and

the corresponding counterparty credit ratings. The table uses credit ratings from S&P and Moody’s,
reflecting the higher of the S&P or Moody’s rating or a middle rating if the entity is split-rated with
more than one rating level difference:

Thousands

AAA/Aaa
AA/Aa
A/A
BBB/Baa

Total

Financial Derivative Position by Credit Rating
Unrealized Fair Value Gain (Loss)
2010
2011

$
-
(57,542)
(5,924)
-

$(63,466)

$
-
(43,656)
(9,017)
-

$(52,673)

In most cases, we also mitigate the credit risk of financial derivatives by having master netting

arrangements with our counterparties which provide for making or receiving net cash settlements.
Generally, transactions of the same type in the same currency that have a settlement on the same day
with a single counterparty are netted and a single payment is delivered or received depending on which
party is due funds.

Additionally we have master contracts in place with each of our derivative counterparties that

include provisions for posting or calling for collateral. Generally we can obtain cash or marketable

80

securities as collateral with one day’s notice. We use various collateral management strategies to
reduce liquidity risk. The collateral provisions vary by counterparty but are not expected to result in the
significant posting of collateral, if any. We have performed stress tests on the portfolio and concluded
that the liquidity risk from collateral calls is not material. Our derivative credit exposure is primarily
with investment grade counterparties rated AA-/Aa3 or higher. Contracts are diversified across
counterparties to reduce credit and liquidity risk.

Credit exposure to insurance companies for environmental damage claims. We regularly

monitor the financial condition of insurance companies who provide or provided general liability
insurance policy coverage to NW Natural and its predecessors with respect to environmental damage
claims. We have filed claims for our environmental costs with a number of insurance companies. The
majority of these companies have credit ratings of A- or better from A.M. Best Co. (AM Best). AM
Best is a global independent credit rating agency who has provided quantitative and qualitative
analysis of insurance company balance sheet strength for over 100 years. AM Best uses a rating scale
that ranges from A++ (“Superior” financial strength) to F (“In Liquidation”), with a rating of A-
considered “Excellent.” A strong credit rating from AM Best is not a guarantee that an insurance
company will be able to meet its contractual obligations. The remaining insurance companies who do
not have credit ratings of A- or better are expected to have sufficient funds in reserves to cover these
claims. Our credit exposure to insurance companies for environmental claims, which reflects amounts
we believe are owed to us, could be material. In the event we are unable to recover environmental
expenses from these insurance policies, we will seek recovery of unreimbursed amounts through
customer rates.

Weather Risk

We are exposed to weather risk primarily from our regulated utility business. A large
percentage of our utility margin is volume driven, and current rates are based on an assumption of
average weather. In 2003, the OPUC approved a weather normalization mechanism for residential and
commercial customers. This mechanism affects customer bills between December 1 through May 15 of
each winter heating season, increasing or decreasing the margin component of customers’ rates to
reflect gas usage based on “average” weather using the 25-year average temperature for each day of
the billing period. The mechanism is intended to stabilize the recovery of our utility’s fixed costs and
reduce fluctuations in customers’ bills due to colder or warmer than average weather. Customers in
Oregon are allowed to opt out of the weather normalization mechanism. As of December 31, 2011,
approximately 9 percent of our Oregon customers had opted out. In addition to the Oregon customers
opting out, our Washington residential and commercial customers account for approximately 10
percent of our total customer base and are not covered by weather normalization. The combination of
Oregon and Washington customers not covered by a weather normalization mechanism is less than 20
percent of all residential and commercial customers.

81

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Table of Contents

1.

2.

3.

4.

5.

Management’s Report on Internal Control Over Financial Reporting . . . . . . . . . . . . . . . . .

Report of Independent Registered Public Accounting Firm . . . . . . . . . . . . . . . . . . . . . . . .

Consolidated Financial Statements:

Consolidated Statements of Comprehensive Income for the Years Ended December 31,

2011, 2010 and 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Consolidated Balance Sheets at December 31, 2011 and 2010 . . . . . . . . . . . . . . . . . . . . . .

Page

83

84

85

86

Consolidated Statements of Shareholders’ Equity for the Years Ended December 31,

2011, 2010 and 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

88

Consolidated Statements of Cash Flows for the Years Ended December 31, 2011, 2010

and 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Notes to Consolidated Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

89

90

Quarterly Financial Information (unaudited) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

130

Supplementary Data for the Years Ended December 31, 2011, 2010 and 2009:

Financial Statement Schedule

Schedule II—Valuation and Qualifying Accounts and Reserves . . . . . . . . . . . . . . . . . . . .

131

Supplemental Schedules Omitted

All other schedules are omitted because of the absence of the conditions under which they are
required or because the required information is included elsewhere in the financial statements

82

MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Management is responsible for establishing and maintaining adequate internal control over

financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of
1934, as amended. Our internal control over financial reporting is 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 in the United States of
America (GAAP). Our 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 involving company assets;

(ii) provide reasonable assurance that transactions are recorded as necessary to permit the

preparation of financial statements in accordance with GAAP, and that receipts and expenditures
are being made only in accordance with authorizations of management and the Board of
Directors; and

(iii) provide reasonable assurance regarding prevention or timely detection of the

unauthorized acquisition, use or disposition of our 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 or fraud. 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.

Management assessed the effectiveness of our internal control over financial reporting as of

December 31, 2011. In making this assessment, management used the criteria set forth by the
Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-
Integrated Framework.

Based on our assessment and those criteria, management has concluded that we maintained

effective internal control over financial reporting as of December 31, 2011.

The effectiveness of internal control over financial reporting as of December 31, 2011 has been

audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated
in their report which appears in this annual report.

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer

/s/ David H. Anderson
David H. Anderson
Senior Vice President and Chief Financial Officer

February 28, 2012

83

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of
Northwest Natural Gas Company:

In our opinion, the consolidated financial statements listed in the accompanying table of contents present fairly, in all
material respects, the financial position of Northwest Natural Gas Company and its subsidiaries at December 31,
2011 and 2010, and the results of their operations and their cash flows for each of the three years in the period
ended December 31, 2011 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 accompanying table of
contents 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, 2011, 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 schedule,
for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal
control over financial reporting, included in the accompanying Management’s Report on Internal Control over
Financial Reporting. Our responsibility is to express opinions on these financial statements, on the financial statement
schedule, 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

Portland, Oregon
February 28, 2012

84

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Thousands, except per share amounts (year ended December 31)

2011

2010

2009

Operating revenues:

Gross operating revenues
Less: Cost of sales

Revenue taxes

Net operating revenues

Operating expenses:

Operations and maintenance
General taxes
Depreciation and amortization

Total operating expenses

Income from operations

Other income and expense - net
Interest expense - net

Income before income taxes
Income tax expense

Net income

Other comprehensive income:

$848,796
458,622
20,741

$812,106
424,534
19,991

$1,012,711
611,168
24,656

369,433

367,581

376,887

125,303
29,281
70,004

120,980
23,872
65,124

224,588

209,976

144,845

157,605

4,523
42,088

107,280
43,382

7,102
42,578

122,129
49,462

63,898

72,667

127,104
28,253
62,814

218,171

158,716

3,714
40,637

121,793
46,671

75,122

Change in employee benefit plan liability, net of taxes of $1,161 for

2011, $674 for 2010 and $1,273 for 2009

(1,779)

(1,027)

(1,936)

Amortization of non-qualified employee benefit plan liability, net of

taxes of ($383) for 2011, ($257) for 2010 and ($58) for 2009

583

391

354

Comprehensive income

Average common shares outstanding:

Basic
Diluted

Earnings per share of common stock:

Basic
Diluted

Dividends declared per share of common stock

$ 62,702

$ 72,031

$

73,540

26,687
26,744

26,589
26,657

26,511
26,576

$
$
$

2.39
2.39
1.75

$
$
$

2.73
2.73
1.68

$
$
$

2.83
2.83
1.60

See Notes to Consolidated Financial Statements

85

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED BALANCE SHEETS

Thousands (December 31)

Assets:
Current assets:

Cash and cash equivalents
Restricted cash
Accounts receivable
Accrued unbilled revenue
Allowance for uncollectible accounts
Regulatory assets
Derivative instruments
Inventories
Gas reserves
Income taxes receivable
Other current assets

Total current assets

Non-current assets:

Property, plant and equipment
Less accumulated depreciation

Total property, plant and equipment - net

Gas reserves
Regulatory assets
Derivative instruments
Other investments
Restricted cash
Other non-current assets

Total non-current assets

Total assets

2011

2010

$

$

5,833
-
77,449
61,925
(2,895)
94,673
2,853
74,363
4,463
7,045
22,980

3,457
924
67,969
64,803
(2,950)
52,714
2,245
80,385
-
41,066
19,652

348,689

330,265

2,661,102
767,226

1,893,876
47,451
371,392
-
68,263
4,000
12,903

2,576,402
722,239

1,854,163
-
348,897
628
69,094
-
13,569

2,397,885

2,286,351

$2,746,574

$2,616,616

See Notes to Consolidated Financial Statements

86

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED BALANCE SHEETS

Thousands (December 31)

Capitalization and liabilities:
Capitalization:

Common stock - no par value; authorized 100,000 shares; issued and outstanding

26,756 and 26,668 at December 31, 2011 and 2010, respectively

Retained earnings
Accumulated other comprehensive loss

Total common stock equity

Long-term debt

Total capitalization

Current liabilities:
Short-term debt
Current maturities of long-term debt
Accounts payable
Taxes accrued
Interest accrued
Regulatory liabilities
Derivative instruments
Other current liabilities

Total current liabilities

Deferred credits and other non-current liabilities:

Deferred tax liabilities
Regulatory liabilities
Pension and other postretirement benefit liabilities
Derivative instruments
Other non-current liabilities

Total deferred credits and other non-current liabilities

Commitments and contingencies (see Note 15)

Total capitalization and liabilities

2011

2010

$ 348,383
373,905
(7,800)

$ 342,978
356,727
(6,604)

714,488
641,700

693,101
591,700

1,356,188

1,284,801

141,600
40,000
86,300
10,747
5,857
31,046
57,317
41,597

414,464

413,209
278,382
201,530
6,536
76,265

975,922

-

257,435
10,000
93,243
10,579
5,182
17,828
38,437
35,457

468,161

373,409
258,031
144,250
17,022
70,942

863,654

-

$2,746,574

$2,616,616

See Notes to Consolidated Financial Statements

87

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

Thousands

Balance at Dec. 31, 2008
Comprehensive income
Restricted stock amortizations
Dividends paid on common stock
Tax benefits from employee stock option plan
Stock-based compensation
Issuance of common stock

Balance at Dec. 31, 2009
Comprehensive income
Dividends paid on common stock
Tax expense from employee stock option plan
Stock-based compensation
Issuance of common stock

Balance at Dec. 31, 2010
Comprehensive income
Dividends paid on common stock
Tax expense from employee stock option plan
Stock-based compensation
Issuance of common stock
Common stock expense

Common
Stock

Retained
Earnings

$336,754
-
39
-
229
(776)
1,115

$296,005
75,122
-
(42,415)
-
-
-

337,361
-
-
(125)
554
5,188

342,978
-
-
(26)
1,769
3,632
30

328,712
72,667
(44,652)
-
-
-

356,727
63,898
(46,690)
-
-
-
(30)

Accumulated
Other
Comprehensive
Income (Loss)

$(4,386)
(1,582)
-
-
-
-
-

(5,968)
(636)
-
-
-
-

(6,604)
(1,196)
-
-
-
-
-

Total
Equity

$628,373
73,540
39
(42,415)
229
(776)
1,115

660,105
72,031
(44,652)
(125)
554
5,188

693,101
62,702
(46,690)
(26)
1,769
3,632
-

Balance at Dec. 31, 2011

$348,383

$373,905

$(7,800)

$714,488

See Notes to Consolidated Financial Statements

88

NORTHWEST NATURAL GAS COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS

Thousands (year ended December 31)

2011

2010

2009

Operating activities:

Net income
Adjustments to reconcile net income to cash provided by operations:

Depreciation and amortization
Undistributed earnings from equity investments
Non-cash expenses related to qualified defined benefit pension plans
Contributions to qualified defined benefit pension plans
Deferred environmental expenditures, net of recoveries
Settlement of interest rate hedge
Other
Changes in assets and liabilities:

Receivables
Inventories
Taxes accrued
Accounts payable
Interest accrued
Deferred gas costs
Deferred tax liabilities
Other - net

$ 63,898

$ 72,667

$ 75,122

70,004
1,329
7,191
(22,045)
25,586
-
(1,049)

(6,246)
6,022
34,189
148
675
8,565
46,877
(1,682)

65,124
(588)
8,009
(10,000)
(7,826)
-
(2,265)

15,830
572
(51,524)
(11,846)
(253)
(26,090)
76,410
(1,751)

62,814
(1,329)
9,914
(25,000)
(10,069)
(10,096)
(3,461)

35,506
15,110
23,461
1,188
8,582
36,819
36,775
(15,001)

Cash provided by operating activities

233,462

126,469

240,335

Investing activities:

Capital expenditures
Utility gas reserves
Restricted cash
Other

Cash used in investing activities

Financing activities:

Common stock issued - net
Long-term debt issued
Long-term debt retired
Change in short-term debt
Cash dividend payments on common stock
Other

Cash provided by (used in) financing activities

Increase (decrease) in cash and cash equivalents
Cash and cash equivalents - beginning of period

Cash and cash equivalents - end of period

Supplemental disclosure of cash flow information:

Interest paid
Income taxes paid

(100,534)
(50,597)
(3,076)
1,142

(248,505)
-
34,619
1,015

(135,124)
-
(30,524)
3,507

(153,065)

(212,871)

(162,141)

3,040
90,000
(10,000)
(115,835)
(46,690)
1,464

4,598
-
(35,000)
155,435
(44,652)
1,046

(375)
125,000
(300)
(158,851)
(42,415)
263

(78,021)

81,427

(76,678)

2,376
3,457

(4,975)
8,432

1,516
6,916

$

5,833

$

3,457

$

8,432

$ 41,413
1,756
$

$ 41,037
$ 22,600

$ 36,762
$ 10,000

See Notes to Consolidated Financial Statements

89

NORTHWEST NATURAL GAS COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.

Organization and Principles of Consolidation

The accompanying consolidated financial statements represent the consolidation of Northwest

Natural Gas Company (NW Natural) and all companies that we directly or indirectly control, either
through majority ownership or otherwise. Our direct and indirect wholly-owned subsidiaries include
Gill Ranch Storage, LLC (Gill Ranch), NW Natural Energy, LLC (NWN Energy), NW Natural Gas
Storage, LLC (NWN Gas Storage), and NNG Financial Corporation (NNG Financial). Investments in
corporate joint ventures and partnerships that we do not directly or indirectly control, and for which we
are not the primary beneficiary, are accounted for under the equity method or the cost method, which
includes NWN Energy’s investment in Palomar Gas Holdings, LLC (PGH). NW Natural and its
affiliated companies are collectively referred to herein as “NW Natural.” The consolidated financial
statements are presented after elimination of all significant intercompany balances and transactions,
except for amounts required to be included under regulatory accounting standards to reflect the effect
of such regulation. In this report, the term “utility” is used to describe our regulated gas distribution
business, and the term “non-utility” is used to describe our gas storage business and other non-utility
investments and business activities.

Certain prior year balances in our consolidated financial statements have been combined to

conform with the current presentation. These changes had no impact on our prior year’s consolidated
results of operations, financial condition or cash flows.

2.

Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting

principles in the United States of America (U.S. GAAP) requires management to make estimates and
assumptions that affect reported amounts in the consolidated financial statements and accompanying
notes. Actual amounts could differ from those estimates, and changes would most likely be reported in
future periods. Management believes that the estimates and assumptions used are reasonable.

Industry Regulation

Our principal businesses are the distribution of natural gas, which is regulated by the Public

Utility Commission of Oregon (OPUC) and Washington Utilities and Transportation Commission
(WUTC), and natural gas storage services, which are regulated by either the Federal Energy
Regulatory Commission (FERC) or the California Public Utilities Commission (CPUC), and to a
certain extent by the OPUC. Accounting records and practices of our regulated businesses conform to
the requirements and uniform system of accounts prescribed by these regulatory authorities in
accordance with U.S. GAAP. Our businesses regulated by the OPUC, WUTC and FERC earn a
reasonable return on invested capital from approved cost-based rates, while our business regulated by
the CPUC earns a return to the extent we are able to charge competitive prices above our costs (i.e.
market-based rates).

In applying regulatory accounting principles, we capitalize or defer certain costs and revenues

as regulatory assets and liabilities pursuant to orders of the OPUC or WUTC, which provides for the
recovery of revenues or expenses from, or refunds to, utility customers in future periods, including a
return or a carrying charge in most cases.

90

At December 31, 2011 and 2010, the amounts deferred as regulatory assets and liabilities were

as follows:

Thousands
Current:

Unrealized loss on derivatives (1)
Pension and other postretirement benefit liabilities (2)
Other (3)

Total current

Non-current:

Unrealized loss on derivatives (1)
Income tax asset
Pension and other postretirement benefit liabilities(2)
Environmental costs (4)
Other (3)

Total non-current

Thousands
Current:

Gas costs
Unrealized gain on derivatives (1)
Other (3)

Total current

Non-current:
Gas costs
Unrealized gain on derivatives (1)
Accrued asset removal costs
Other (3)

Total non-current

Regulatory Assets
2010
2011

$ 57,317
15,491
21,865

$ 38,437
10,988
3,289

$ 94,673

$ 52,714

$

6,536
65,264
170,512
105,670
23,410

$ 17,022
72,341
118,248
114,311
26,975

$371,392

$348,897

Regulatory Liabilities

2011

2010

$ 17,994
2,853
10,199

$ 15,583
2,245
-

$ 31,046

$ 17,828

$

8,420
-
267,355
2,607

$

2,297
628
252,941
2,165

$278,382

$258,031

(1) An unrealized gain or loss on derivatives does not earn a rate of return or a carrying charge. These amounts are

recoverable through utility rates as part of the annual Purchased Gas Adjustment mechanism when realized at settlement.

(2) Certain pension and other postretirement benefit liabilities of the utility are approved for regulatory deferral, including

amounts recorded to the pension cost balancing account to defer the effects of higher and lower pension expenses. Such
amounts include an interest component when recognized in net periodic benefit costs or earn a rate of return or carrying
charge (see Note 9).

(3) Other primarily consists of deferrals and amortizations under other approved regulatory mechanisms. The accounts being

(4)

amortized typically earn a rate of return or carrying charge.
Environmental costs are related to those sites that are approved for regulatory deferral. In Oregon, we earn a rate of
return on amounts paid, whereas amounts accrued but not yet paid do not earn a rate of return or a carrying charge until
expended. Environmental costs related to Washington were deferred beginning in 2011, with cost recovery and carrying
charge to be determined in a future proceeding.

91

The amortization period for our regulatory assets and liabilities ranges from less than one year

to an undeterminable period. Our regulatory deferrals for gas costs payable are generally amortized
over 12 months beginning each November 1 following the gas contract year during which the deferred
gas costs are realized. Similarly, most of our regulatory deferred accounts are amortized over 12
months. However, certain regulatory account balances, such as income taxes, environmental costs,
pension liabilities and accrued asset removal costs, are large and tend to be amortized over longer
periods once we have agreed upon an amortization period with the respective regulatory agency.

We believe that continued application of regulatory accounting for these activities is
appropriate and consistent with the current regulatory environment, and that all regulated assets and
liabilities at December 31, 2011 and 2010 will be recoverable or refundable through future rate making
decisions. We annually review all regulatory assets and liabilities for recoverability and more often if
circumstances warrant. If we should determine that all or a portion of these regulatory assets or
liabilities no longer meet the criteria for continued application of regulatory accounting, then we would
be required to write off the net unrecoverable balances against earnings.

New Accounting Standards

Adopted Standards

Fair Value Disclosures. In January 2011, the Financial Accounting Standards Board (FASB)
issued authoritative guidance on new fair value measurements and disclosures. This guidance requires
additional disclosures for fair value measurements that use significant assumptions not observable in
active markets (i.e. level 3 valuations), including a roll-forward schedule. These changes were effective
for periods beginning after December 15, 2010; however, we elected to early adopt these disclosure
requirements, as shown in Note 9. The adoption of this standard did not have a material effect on our
financial statement disclosures.

Comprehensive Income. In June 2011, the FASB issued authoritative guidance on the

presentation of comprehensive income within the financial statements. An entity can elect to present
items of net income and other comprehensive income in one continuous statement—referred to as the
statement of comprehensive income—or in two separate, but consecutive, statements. These changes
are effective for periods beginning after December 15, 2011. We have elected to early adopt this
standard and present net income and other comprehensive income in one continuous statement.

Multiemployer Pension Plans. In September 2011, the FASB issued authoritative guidance
regarding multiemployer pension plan disclosures. The revised standard is intended to provide more
information about an employer’s financial obligations to a multiemployer pension plan and, therefore,
help financial statement users better understand the financial health of all significant plans in which the
employer participates. This standard has been adopted as shown in Note 9.

Recent Accounting Pronouncements

Fair Value Measurement. In May 2011, the FASB issued amendments to the authoritative

guidance on fair value measurement. The amendments are primarily related to disclosure requirements,
which go into effect for periods beginning after December 15, 2011. Early implementation is not
allowed, and we are currently assessing the impact on our financial statement disclosures.

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Balance Sheet Offsetting. In December 2011, the FASB issued authoritative guidance
regarding the offsetting of assets and liabilities on the balance sheet. The revised standard is intended
to provide more comparable guidance between the U.S. GAAP and international accounting standards
by requiring entities to disclose both gross and net amounts for assets and liabilities offset on the
balance sheet as well as other disclosures concerning their enforceable master netting arrangements.
This guidance is effective for annual reporting periods beginning after January 1, 2013 and we are
currently assessing the impact on our financial statement disclosures.

Plant, Property and Accrued Asset Removal Costs

Plant and property are stated at cost, including capitalized labor, materials and overhead (see
Note 11). In accordance with regulatory accounting standards, the cost of acquiring and constructing
long-lived plant and property generally includes an allowance for funds used during construction
(AFUDC) or capitalized interest. AFUDC represents the regulatory financing cost incurred when debt
and equity funds are used for construction (see “Allowance for Funds Used During Construction,”
below). When constructed assets are subject to market-based rates rather than cost-based rates, then the
financing cost incurred during construction are included in capitalized interest in accordance with U.S.
GAAP, not regulatory financing cost under AFUDC.

In accordance with long-standing regulatory treatment, our depreciation rates are comprised of

three components: one based on the average service life of the asset, a second based on the estimated
salvage value of the asset, and a third based on the asset’s cost of removal. We collect, through rates,
the estimated cost of removal on certain regulated properties through depreciation expense, with a
corresponding offset to accumulated depreciation. These removal costs are non-legal obligations as
defined by regulatory accounting guidance. Therefore, we have included these costs in non-current
regulatory liabilities on our consolidated balance sheets. In the rate setting process, the liability for the
removal costs is treated as a reduction to the net rate base upon which the regulated utility has the
opportunity to earn its allowed rate of return.

Our provision for depreciation of utility plant and property is computed under the straight-line

method in accordance with engineering studies approved by regulatory authorities. The weighted
average depreciation rate for utility assets in service was approximately 2.8 percent in 2011 and 2010,
and 2.9 percent in 2009 reflecting the approximate average economic life of the property. This includes
2011 weighted average depreciation rates for the following asset categories: 2.7 percent for
transmission and distribution plant, 2.2 percent for gas storage facilities, 4.6 percent for general plant,
and 5.1 percent for intangible and other fixed assets.

Allowance for Funds Used During Construction

Certain additions to utility plant include AFUDC, which represents the net cost of debt and
equity funds used during construction. AFUDC is calculated using actual interest rates for debt and
authorized rates for return on equity, if applicable. If short-term debt balances are less than the total
balance of construction work in progress, then a composite AFUDC rate is used to represent interest on
all debt funds, shown as a reduction to interest charges, and a return on equity funds, shown as other
income. While cash is not immediately recognized from recording AFUDC, it is realized in future
years through rate recovery resulting from the higher utility cost of service. Our composite AFUDC
rates were 0.5 percent in 2011, 0.6 percent in 2010 and 1.0 percent in 2009.

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Cash and Cash Equivalents

For purposes of reporting cash flows, cash and cash equivalents include cash on hand plus

highly liquid investment accounts with maturity dates of three months or less. At December 31, 2011,
outstanding checks of approximately $3.9 million were included in accounts payable.

Revenue Recognition and Accrued Unbilled Revenues

Utility revenues, derived primarily from the sale and transportation of natural gas, are
recognized upon delivery of gas commodity or service to customers. Revenues include accruals for gas
delivered but not yet billed to customers based on estimates of deliveries from meter reading dates to
month end (accrued unbilled revenues). Accrued unbilled revenues are dependent upon a number of
factors that require management’s judgment, including total gas receipts and deliveries, customer use
by billing cycle and weather factors. Accrued unbilled revenues are reversed the following month
when actual billings occur. Our accrued unbilled revenues at December 31, 2011 and 2010 were $61.9
million and $64.8 million, respectively.

From 2007 through 2010, utility net operating revenues also included the recognition of a

regulatory adjustment for income taxes paid pursuant to a legislative rule (commonly referred to as SB
408) in effect for certain gas and electric utilities in Oregon. Under SB 408, we were required to
automatically implement a rate refund, or a rate surcharge, to utility customers on an annual basis. The
refund or surcharge amount was based on the difference between income taxes paid and income taxes
authorized to be collected in customer rates. We recorded the refund, or surcharge, each quarter based
on estimates of the annual amount to be recognized. On May 24, 2011, SB 408 was repealed and
replaced by Senate Bill 967. SB 967 required utilities to eliminate amounts accrued under SB 408 for
the 2010 and 2011 tax years, thereby denying recovery by NW Natural of the surcharge accrued for
2010, which resulted in a one-time pre-tax charge of $7.4 million in the second quarter of 2011.
Pursuant to SB 967, we changed our revenue recognition policy effective January 1, 2011 and no
longer recognize a regulatory adjustment for income taxes for SB 408.

Non-utility revenues are derived primarily from the gas storage business segment. At Mist,

revenues are recognized upon delivery of services to customers. Revenues from our asset management
partner are recognized over the life of the asset management contract for guaranteed amounts, if any,
and are recognized as earned for amounts above the guaranteed amount. At Gill Ranch, firm storage
services resulting from short-term and long-term contracts are typically recognized in revenue ratably
over the term of the contract regardless of the actual storage capacity utilized. Asset management
revenue is recognized using a straight-line, pro rata methodology over the term of each contract and
provides us with 80 percent of the pre-tax income from our independent energy marketing company.
See Note 4.

Accounts Receivable and Allowance for Uncollectible Accounts

Accounts receivable consist primarily of amounts due for natural gas sales and transportation

services to core utility customers, plus amounts due for gas storage services. With respect to these
trade receivables, including accrued unbilled revenues, we establish an allowance for uncollectible
accounts (allowance) based on the aging of receivables, collection experience of past due account
balances including payment plans, and historical trends of write-offs as a percent of revenues. With
respect to large individual customer receivables, a specific allowance is established and added to the
general allowance when amounts are identified as unlikely to be partially or fully recovered. Inactive
accounts are written-off against the allowance after they are 120 days past due or when deemed to be

94

uncollectible. Differences between our estimated allowance and actual write-offs will occur based on a
number of factors, including changes in economic conditions, customer credit worthiness and the level
of natural gas prices. Each quarter the allowance for uncollectible accounts is adjusted, as necessary,
based on information currently available.

Inventories

Utility gas inventories, which consist of natural gas in storage for the utility, are generally

stated at the lower of average cost or net realizable value. The regulatory treatment of utility gas
inventories provides for cost recovery in customer rates. Utility gas inventories that are injected into
storage are priced into inventory based on actual purchase costs. Utility gas inventories that are
withdrawn from storage are charged to cost of gas during the current period at the weighted average
inventory cost.

Gas Storage inventories, which primarily represent inventories at Gill Ranch, exclude cushion

gas and consist of natural gas that we received as fuel-in-kind from storage customers. Gas Storage
inventories are valued at the lower of average cost or net realizable value. Cushion gas is recorded at
original cost and classified as long-term assets.

Material and supplies inventories, which consist of both utility and non-utility inventories, are

stated at the lower of average cost or net realizable value.

Our utility and gas storage inventories totaled $65.6 million and $70.7 million at December 31,

2011 and 2010, respectively, and our materials and supplies inventories totaled $8.8 million and $9.7
million at December 31, 2011 and 2010, respectively.

Gas Reserves

Our gas reserves are stated at cost, adjusted for regulatory amortization, with the associated
deferred tax benefits recorded as liabilities on the balance sheet. Transactional costs to enter into the
agreement (see Note 12) and payments by NW Natural to Encana Oil & Gas (USA) Inc. (Encana) are
recognized as gas reserves on the balance sheet. The current portion is calculated based on expected
gas deliveries within the next fiscal year. We recognize regulatory amortization of this asset on a
volumetric basis and calculate using the proven reserves and the therms extracted and sold each
month. The amortization of gas reserves is recorded as an adjustment to the cost of gas.

Derivatives

In accordance with accounting for derivatives and hedges, we measure derivatives at fair value

and recognize them as either assets or liabilities on the balance sheet. Accounting for derivatives
requires that changes in the fair value be recognized currently in earnings unless specific hedge
accounting criteria are met. Accounting for derivatives and hedges provides an exception for contracts
intended for normal purchases and normal sales for which physical delivery is probable. In addition,
certain derivative contracts are approved by regulatory authorities for recovery or refund through
customer rates. Accordingly, the changes in fair value of these approved contracts are deferred as
regulatory assets or liabilities pursuant to regulatory accounting principles. Derivative contracts entered

95

into for core utility customer requirements after the annual purchased gas adjustment (PGA) rate has
been set are subject to the PGA incentive sharing mechanism. Effective November 1, 2008, Oregon
approved a PGA sharing mechanism under which we are required to select either an 80 percent deferral
or 90 percent deferral of higher or lower gas costs such that the impact on current earnings from the
gas cost sharing is either 20 percent or 10 percent of gas cost differences compared to PGA prices,
respectively. For the PGA years in Oregon beginning November 1, 2011, 2010 and 2009, we selected a
90 percent deferral of gas cost differences. In Washington, 100 percent of our gas cost differences are
deferred. See Note 13.

Our financial derivatives policy sets forth the guidelines for using selected derivative products

to support prudent risk management strategies within designated parameters. Our objective for using
derivatives is to decrease the volatility of gas prices, earnings and cash flows and to prevent
speculative risk. The use of derivatives is permitted only after the risk exposures have been identified,
are determined to exceed acceptable tolerance levels and are necessary to support normal business
activities. We do not enter into derivative instruments for trading purposes and we believe that any
increase in market risk created by holding derivatives should be offset by the exposures they modify.

Fair Value

In accordance with fair value accounting, we use the following fair value hierarchy for

determining inputs for our debt, pension plan assets and our derivative fair value measurements:

• Level 1: Valuation is based upon quoted prices for identical instruments traded in active

markets;

• Level 2: Valuation is based upon quoted prices for similar instruments in active markets,

quoted prices for identical or similar instruments in markets that are not active, and model-
based valuation techniques for which all significant assumptions are observable in the
market; and

• Level 3: Valuation is generated from model-based techniques that use significant

assumptions not observable in the market. These unobservable assumptions reflect our own
estimates of assumptions that market participants would use in valuing the asset or liability.

When developing fair value measurements, it is our policy to use quoted market prices
whenever available, or to maximize the use of observable inputs and minimize the use of unobservable
inputs when quoted market prices are not available. Fair values are primarily developed using industry-
standard models that consider various inputs including: (a) quoted future prices for commodities;
(b) forward currency prices; (c) time value; (d) volatility factors; (e) current market and contractual
prices for underlying instruments; (f) market interest rates and yield curves; (g) credit spreads; (h) and
other relevant economic measures.

Revenue Taxes

We account for revenue-based taxes as a separate cost item collected from customers.

Therefore, revenue taxes are accounted for as a cost of sale and presented separately on the income
statement.

Income Tax Expense

NW Natural and its wholly-owned subsidiaries file consolidated federal and state income tax

returns. Current income taxes are allocated based on each entity’s respective taxable income or loss

96

and tax credits as if each entity filed a separate return. We account for income taxes in accordance with
accounting standards for income taxes. Accounting for income taxes requires recognition of deferred
tax liabilities and assets for the future tax consequences of events that have been included in the
consolidated financial statements or tax returns. Under this method, deferred tax liabilities and assets
are determined based on the difference between the financial statement and tax basis of assets and
liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse
(see Note 10).

Accounting for income taxes also requires recognition of deferred income tax assets and
liabilities for temporary differences where regulators prohibit deferred income tax treatment for
ratemaking purposes. We have recorded a deferred tax liability equivalent of $68.5 million and $72.3
million at December 31, 2011 and 2010, respectively, to recognize future taxes payable resulting from
transactions that have previously been reflected in the financial statements for these temporary
differences. Regulatory assets or liabilities corresponding to such additional deferred income tax assets
or liabilities may be recorded to the extent we believe they will be recoverable from or payable to
customers through the ratemaking process. Pursuant to regulatory accounting principles, a
corresponding regulatory asset has been recorded which represents the probable future revenue that
will result from inclusion in rates charged to customers of taxes which will be paid in the future. The
probable future revenue to be recorded takes into consideration the additional future taxes which will
be generated by that revenue. Amounts applicable to income taxes due from customers primarily
represent differences between the book and tax basis of net utility plant in service and actual removal
costs incurred.

Deferred investment tax credits on utility plant additions, which reduce income taxes payable,

are deferred for financial statement purposes and amortized over the life of the related plant or lease.

Subsequent Events

We monitor significant events occurring after the balance sheet date and prior to the issuance
of the financial statements to determine the impacts, if any, of events on the financial statements to be
issued. We do not have any subsequent events to report.

97

3.

Earnings Per Share

Basic earnings per share are computed using net income and the weighted average number of
common shares outstanding for each period presented. Diluted earnings per share are computed in the
same manner, except it uses the weighted average number of common shares outstanding plus the
effects of the assumed exercise of stock options and the payment of estimated stock awards from other
stock-based compensation plans that are outstanding at the end of each period presented. Diluted
earnings per share are calculated as follows:

Thousands, except per share amounts

Net income

Average common shares outstanding—basic

Additional shares for stock-based compensation plans

Average common shares outstanding—diluted

Earnings per share of common stock—basic

Earnings per share of common stock—diluted

Additional information:

Antidilutive shares not included in net income per diluted

2011

2010

2009

$63,898

$72,667

$75,122

26,687
57

26,744

26,589
68

26,657

26,511
65

26,576

$

$

2.39

2.39

$

$

2.73

2.73

$

$

2.83

2.83

common share calculation

2,101

743

2,142

4.

Segment Information

We operate in two primary reportable business segments, local gas distribution and gas
storage. We also have other investments and business activities not specifically related to one of these
two reporting segments, which we aggregate and report as “other.” We refer to our local gas
distribution business as the “utility,” and our “gas storage” and “other” business segments as “non-
utility.” Our gas storage segment includes NWN Gas Storage, which is a wholly-owned subsidiary of
NWN Energy, Gill Ranch, which is a wholly-owned subsidiary of NWN Gas Storage, the non-utility
portion of our Mist underground storage facility in Oregon (Mist) and third-party asset management
services. Our “other” segment includes NNG Financial and our equity investment in PGH, which is
pursuing development of the Palomar pipeline project (see Other, below).

Local Gas Distribution

Our local gas distribution segment is a regulated utility principally engaged in the purchase, sale
and delivery of natural gas and related services to customers in Oregon and southwest Washington. As a
regulated utility, we are responsible for building and maintaining a safe and reliable pipeline distribution
system, purchasing sufficient gas supplies from producers and marketers, contracting for firm and
interruptible transportation of gas over interstate pipelines to bring gas from the supply basins into our
service territory, and re-selling the gas to customers subject to rates, terms and conditions approved by
the OPUC or WUTC. Gas distribution also includes taking customer-owned gas and transporting it from
interstate pipeline connections, or city gates, to the customers’ end-use facilities for a fee, which is
approved by the OPUC or WUTC. Approximately 90 percent of our customers are located in Oregon and
10 percent in Washington. On an annual basis, residential and commercial customers typically account
for 50 to 60 percent of our utility’s total volumes delivered and 80 to 90 percent of our utility’s margin.
Industrial customers account for the remaining 40 to 50 percent of volumes and 5 to 15 percent of
margin. The remaining 10 percent or less of margin is derived from miscellaneous services, gains or
losses from an incentive gas cost sharing mechanism and other fees.

98

Industrial customers we serve include: pulp, paper and other forest products; the manufacture

of electronic, electrochemical and electrometallurgical products; the processing of farm and food
products; the production of various mineral products; metal fabrication and casting; the production of
machine tools, machinery and textiles; the manufacture of asphalt, concrete and rubber; printing and
publishing; nurseries; government and educational institutions; and electric generation. No individual
customer or industry group accounts for a significant portion of our utility revenues or margins.

Gas Storage

Our gas storage business segment includes natural gas storage services provided to customers

primarily from two underground natural gas storage facilities, our Gill Ranch gas storage facility,
which commenced commercial operations in October 2010, and the non-utility portion of our Mist gas
storage facility. In addition to earning revenue from customer storage contracts, we also use an
independent energy marketing company to provide asset management services for utility and
non-utility capacity under contractual arrangement, the results of which are included in this business
segment. For the years ended December 31, 2011, 2010 and 2009, this business segment derived a
majority of its revenues from asset management services and from firm and interruptible gas storage
contracts.

Mist Gas Storage Facility. Earnings from non-utility assets at the Mist facility are primarily

related to firm storage capacity revenues. Earnings for the gas storage segment include revenues, net of
amounts shared with core utility customers, from management of utility assets at Mist and upstream
capacity when not needed to serve core utility customers. In Oregon, the gas storage segment retains
80 percent of the pre-tax income from these services when the costs of the capacity have not been
included in utility rates, or 33 percent of the pre-tax income when the costs have been included in
utility rates. The remaining 20 percent and 67 percent, respectively, are credited to a deferred
regulatory account for crediting back to core utility customers. We have a similar sharing mechanism
in Washington for revenue derived from storage and third party asset management services.

Gill Ranch Gas Storage Facility. Gill Ranch has a joint project agreement with Pacific

Gas and Electric Company (PG&E) to own the Gill Ranch underground natural gas storage facility
near Fresno, California. Gill Ranch has a 75 percent undivided ownership interest in the facility, which
offers storage services to the California market at market-based rates, subject to CPUC regulation
including, but not limited to, service terms and conditions and tariff regulations.

Other

We have non-utility investments and other business activities which are aggregated and
reported as a business segment called “other.” Although in the aggregate these investments and
activities are currently not material to consolidated operations, we identify and report them as a stand-
alone segment based on our organizational structure and decision-making process because these
business investments and activities are not specifically related to our utility or gas storage
segments. This segment primarily consists of an equity method investment in a joint venture to build
and operate an interstate gas transmission pipeline in Oregon (Palomar) and other pipeline assets in
NNG Financial. For more on information on Palomar, see Note 12. This segment also includes some
operating and non-operating revenues and expenses of the parent company that cannot be allocated to
utility operations.

99

NNG Financial holds certain non-utility financial investments, but its assets primarily consist

of an active, wholly-owned subsidiary which owns a 10 percent interest in an 18-mile interstate natural
gas pipeline. NNG Financial’s total assets were $1.1 million at both December 31, 2011 and 2010.

Segment Information Summary

The following table presents summary financial information about the reportable segments for

the years ended 2011, 2010 and 2009. Inter-segment transactions are insignificant.

Thousands
2011
Net operating revenues
Depreciation and amortization
Income from operations
Net income
Total assets at December 31, 2011

2010
Net operating revenues
Depreciation and amortization
Income from operations
Net income
Total assets at December 31, 2010

2009
Net operating revenues
Depreciation and amortization
Income from operations
Net income

Utility

Gas Storage

Other

Total

$ 342,970
63,843
135,722
60,527
2,435,888

$ 346,148
62,661
145,688
66,262
2,310,388

$ 357,005
61,472
142,228
65,960

$ 26,354
6,161
9,090
4,101
294,637

$ 21,249
2,463
11,855
6,110
282,945

$ 19,738
1,342
16,442
8,923

$

109
-
33
(730)
16,049

$ 369,433
70,004
144,845
63,898
2,746,574

$

184
-
62
295
23,283

$ 367,581
65,124
157,605
72,667
2,616,616

$

144
-
46
239

$ 376,887
62,814
158,716
75,122

5.

Common Stock

Common Stock

As of December 31, 2011 and 2010, our common shares authorized were 100,000,000. As of

December 31, 2011, we had reserved for issuances 155,955 shares of common stock under the
Employee Stock Purchase Plan (ESPP), 293,246 shares under our Dividend Reinvestment and Direct
Stock Purchase Plan and 1,159,875 shares under our Restated Stock Option Plan (Restated SOP).

Stock Repurchase Program

We have a share repurchase program for our common stock under which we purchase shares

on the open market or through privately negotiated transactions. We currently have Board
authorization through May 2012 to repurchase up to an aggregate of 2.8 million shares, or up to $100
million. No shares of common stock were repurchased pursuant to this program in 2011, 2010 or
2009. Since inception in 2000, a total of 2.1 million shares have been repurchased at a total cost of
$83.3 million.

100

Summary of Changes in Common Stock

The following table shows the changes in the number of shares of our common stock issued

and outstanding for the years 2011, 2010 and 2009:

Thousands

Balance, December 31, 2008

Sales to employees under ESPP
Exercise of stock options under Restated SOP—net

Balance, December 31, 2009

Sales to employees under ESPP
Exercise of stock options under Restated SOP—net

Balance, December 31, 2010

Sales to employees under ESPP
Exercise of stock options under Restated SOP—net
Sales to shareholders under DRPP

Balance, December 31, 2011

Shares

26,501
9
23

26,533
24
111

26,668
15
24
49

26,756

6.

Stock-Based Compensation

We have several stock-based compensation plans, including the Long-Term Incentive Plan

(LTIP), the Restated SOP and the ESPP. These plans are designed to promote stock ownership in NW
Natural by employees and officers.

Long-Term Incentive Plan

The LTIP is intended to provide a flexible, competitive compensation program for eligible
officers and key employees. An aggregate of 600,000 shares of common stock was authorized for
grants under the LTIP as stock bonus, restricted stock or performance-based stock awards. Shares
awarded under the LTIP may be purchased on the open market or issued as new shares.

At December 31, 2011, 337,788 shares of common stock were available for award under the

LTIP, assuming that performance based grants currently outstanding are awarded at the target
level. The LTIP stock awards are compensatory awards for which compensation expense is based on
the fair value of stock awards, with expense being recognized over the performance and vesting period
for the outstanding awards.

Performance-based Stock Awards. Since the LTIP’s inception in 2001, performance-based
stock awards have been granted annually based on three-year performance periods. At December 31,
2011, certain performance-based stock award measures had been achieved for the 2009-11 award
period. Accordingly, participants are estimated to receive 8,428 shares of common stock and a
dividend equivalent cash payment equal to the number of shares of common stock received on the
award payout multiplied by the aggregate cash dividends paid per share during the performance period.
At December 31, 2010 and 2009, we awarded 8,007 and 15,900 shares of common stock, respectively,
for the 2008-10 and 2007-09 award periods, plus a dividend equivalent cash payment equal to the
number of shares of common stock received on the award payout multiplied by the aggregate cash
dividends paid per share during the performance period. In 2010 and 2009, we expensed $0.2 million
and $0.5 million respectively for both the 2008-10 and 2007-09 performance-based stock award
periods, and on a cumulative basis we accrued a total of $0.7 million and $1.5 million, respectively,
related to the 2008-10 and 2007-09 performance periods.

101

At December 31, 2011, the aggregate number of performance-based shares granted and

outstanding at the threshold, target and maximum levels were as follows:

Performance
Period

2009-11
2010-12
2011-13

Total

Performance Share Awards Outstanding

Threshold

Target

Maximum

2011
Expense

Cumulative Expense
At Dec. 31, 2011

7,410

n/a (1)
n/a (1)

39,000
41,500
37,950

78,000
83,000
75,900

118,450

236,900

$ 353
430
276

$1,059

$763
718
$276

(1)

The threshold requirement was modified and is no longer applicable beginning in the 2010-12 performance
period.

The threshold level estimates future payout assuming the minimum award payable is achieved
for each component of the formula in the LTIP. For each of these performance periods, awards will be
based on total shareholder return relative to a peer group of gas distribution companies over the three-
year performance period and on performance results achieved relative to specific core and non-core
strategies. Compensation expense is recognized in accordance with the accounting standard for stock
compensation based on performance levels achieved and an estimated fair value using a Black-Scholes
or binomial model. The weighted-average grant date fair value of unvested shares at December 31,
2011 and 2010 was $25.06 and $23.10 per share, respectively. The weighted-average grant date fair
value of shares vested during the year was $22.35 per share and granted during the year was $19.38 per
share.

Restricted Stock Units. A new form of restricted stock awards was approved by the Board in

2011. Restricted Stock Units (RSUs) are expected to be used instead of the Restated SOP starting in
February of 2012. The LTIP plan was amended to allow RSUs to be granted under the plan. RSUs are
expected to include a performance based threshold and a vesting period of four years from the grant
date. An RSU obligates the Company upon vesting to issue the RSU holder one share of common
stock plus a cash payment equal to the total amount of dividends paid per share between the grant date
and vesting date of the RSU.

Restated Stock Option Plan

A total of 2,400,000 shares of common stock were reserved for issuance under the Restated

SOP with 580,650 available for grant as of December 31, 2011. Options under the Restated SOP may
be granted only to officers and key employees designated by a committee of our Board of
Directors. All options are granted at an option price equal to the closing market price on the date of
grant and may be exercised for a period up to 10 years and 7 days from the date of grant. Option
holders may exchange shares they have owned for at least six months, at the current market price, to
purchase shares at the option price.

102

The fair value of each stock option is estimated on the grant date using the Black-Scholes

option pricing model with the following weighted average assumptions and outcomes:

2011

2010

2009

Risk-free interest rate
Expected life (in years)
Expected market price volatility factor
Expected dividend yield
Forfeiture rate
Weighted average grant date fair value

2.0%
4.5

2.3%
4.7

2.0%
4.7
24.5% 23.2% 22.5%
3.8%
3.8%
3.8%
3.7%
3.2%
3.1%
$ 5.46
$ 6.36
$ 6.73

The expected life of our grants was calculated based on our actual experience with previously

exercised option grants. The risk-free interest rate was based on the implied yield currently available
on U.S. Treasury zero-coupon issues with a life equal to the expected life of the options. Historical data
was used to estimate the volatility factor, measured on a daily basis, for a period equal to the duration
of the expected life of the option awards. The dividend yield was based on management’s current
estimate for future dividend payouts at the time of grant. We expense the total cost of stock option
awards granted to retirement eligible employees at the date of grant in accordance with stock option
accounting guidance and the retirement vesting provisions of our option agreements.

Information regarding the Restated SOP activity for the three years ended December 31, 2011

is summarized as follows:

Balance outstanding, Dec. 31, 2008
Granted
Exercised

Balance outstanding, Dec. 31, 2009
Granted
Exercised
Forfeited

Balance outstanding, Dec. 31, 2010
Granted
Exercised
Forfeited

Balance outstanding, Dec. 31, 2011

Exercisable, Dec. 31, 2011

Option
Shares

396,410
111,750
(23,225)

484,935
119,750
(111,525)
(2,700)

490,460
122,700
(24,185)
(9,750)

579,225

311,951

Weighted -
Average
Price Per Share

Intrinsic
Value
(In millions)

$38.62
41.15
30.92

39.57
44.25
39.01
43.00

40.82
45.74
33.88
44.38

$42.09

$40.20

$2.3
n/a
0.3

2.7
n/a
0.9
n/a

2.8
n/a
0.3
n/a

$3.4

$2.4

In the year ended December 31, 2011, cash of $0.8 million was received for option shares

exercised and a $26,000 thousand related tax benefit was realized. For the 12 months ended
December 31, 2011, 2010 and 2009, the total fair value of options that vested was $0.6 million, $0.5
million and $0.4 million, respectively. The weighted average remaining life of options exercisable and
outstanding at December 31, 2011 was 5.5 years and 6.8 years, respectively. As of December 31, 2011,
there was $1.0 million of unrecognized compensation cost related to the unvested portion of
outstanding stock option awards expected to be recognized over a period extending through 2014.

103

Employee Stock Purchase Plan

The ESPP allows employees to purchase common stock at 85 percent of the closing price on

the trading day immediately preceding the initial offering date, which is set annually. Each eligible
employee may purchase up to $21,210 worth of stock through payroll deductions over a 12-month
period.

In accordance with accounting for stock compensation, stock-based compensation expense is

recognized as operations and maintenance expense or is capitalized as part of construction
overhead. The following table summarizes the financial statement impact of stock-based compensation
under our LTIP, Restated SOP and ESPP:

Thousands

2011

2010

2009

Operations and maintenance expense, for stock-based compensation
Income tax benefit

$1,477
(597)

$1,032
(418)

$1,434
(559)

Net stock-based compensation effect on net income

Amounts capitalized for stock-based compensation

$ 880

$ 614

$ 875

$ 261

$ 182

$ 229

7.

Cost and Fair Value Basis of Long-Term Debt

Cost of Long-Term Debt

The issuance of first mortgage debt, including secured medium-term notes (MTNs), under the
Mortgage and Deed of Trust (Mortgage) is limited by eligible property, adjusted net earnings and other
provisions of the Mortgage. The Mortgage constitutes a first mortgage lien on substantially all of our
utility property. In addition, our Gill Ranch subsidiary senior secured notes are secured by all of the
membership interests in Gill Ranch Storage, LLC as well as Gill Ranch’s debt service reserve account.

104

The maturities on the long-term debt outstanding for each of the 12-month periods through

December 31, 2016 amount to: $40 million in 2012; none in 2013; $60 million in 2014; $40 million in
2015; and $65 million in 2016.

Thousands
Utility Medium-Term Notes:
First Mortgage Bonds:
4.11 % Series B due 2010
7.45 % Series B due 2010
6.665 % Series B due 2011
7.13 % Series B due 2012
8.26 % Series B due 2014
3.95 % Series B due 2014
4.70 % Series B due 2015
5.15 % Series B due 2016
7.00 % Series B due 2017
6.60 % Series B due 2018
8.31 % Series B due 2019
7.63 % Series B due 2019
5.37 % Series B due 2020
9.05 % Series A due 2021
3.176 % Series A due 2021
5.62 % Series B due 2023
7.72 % Series B due 2025
6.52 % Series B due 2025
7.05 % Series B due 2026
7.00 % Series B due 2027
6.65 % Series B due 2027
6.65 % Series B due 2028
7.74 % Series B due 2030
7.85 % Series B due 2030
5.82 % Series B due 2032
5.66 % Series B due 2033
5.25 % Series B due 2035

Subsidiary Senior Secured Notes:
Gill Ranch Notes due 2016 (1)

Less current maturities of long-term debt

Total long-term debt

2011

2010

2009

$

-
-
-
40,000
10,000
50,000
40,000
25,000
40,000
22,000
10,000
20,000
75,000
10,000
50,000
40,000
20,000
10,000
20,000
20,000
19,700
10,000
20,000
10,000
30,000
40,000
10,000

$

-
-
10,000
40,000
10,000
50,000
40,000
25,000
40,000
22,000
10,000
20,000
75,000
10,000
-
40,000
20,000
10,000
20,000
20,000
19,700
10,000
20,000
10,000
30,000
40,000
10,000

$ 10,000
25,000
10,000
40,000
10,000
50,000
40,000
25,000
40,000
22,000
10,000
20,000
75,000
10,000
-
40,000
20,000
10,000
20,000
20,000
19,700
10,000
20,000
10,000
30,000
40,000
10,000

641,700

601,700

636,700

40,000

681,700
40,000

-

-

601,700
10,000

636,700
35,000

$641,700

$591,700

$601,700

(1)

In November 2011, Gill Ranch issued senior secured notes consisting of $20 million of fixed rate notes with an interest
rate of 7.75 percent and $20 million of variable interest rate notes with an interest rate of LIBOR plus 5.50, or a
minimum of 7.00 percent. Currently, the variable interest rate is 7.00 percent.

Utility Medium-Term Notes

In March 2009, the utility issued $75 million of 5.37 percent secured MTNs due February 1,

2020, and in July 2009 issued another $50 million of 3.95 percent secured MTNs due July 15,
2014. The utility also issued $50 million of MTNs in September 2011 with an interest rate of 3.176
percent and a maturity date of September 15, 2021.

Subsidiary Senior Secured Notes

In November 2011, Gill Ranch issued $40 million of subsidiary senior secured notes with an

interest rate of 7.75 percent on the fixed portion and a 7.00 percent interest rate currently on the

105

variable portion. The notes are secured by all of the membership interests in Gill Ranch Storage, LLC,
and are nonrecourse notes to NW Natural. The maturity date of these notes is November 30, 2016.

Under the note agreements, Gill Ranch is subject to certain covenants and restrictions,
including but not limited to, a financial covenant that requires Gill Ranch to maintain minimum
adjusted earnings before interest, taxes, depreciation and amortization (EBITDA) at various levels over
the term of the notes. The minimum adjusted EBITDA increases incrementally over the first few years,
reaching its highest level in the 12-month period beginning April 1, 2015. Under the note agreements,
Gill Ranch is also subject to a debt service reserve requirement of 10 percent of the outstanding
principal amount, initially $4 million, certain prepayment penalties, restrictions on dividends out of
Gill Ranch unless certain earnings ratios are met, and restrictions on incurrence of additional debt.

Fair Value of Long-Term Debt

The following table provides an estimate of the fair value of our long-term debt including

current maturities of long-term debt, using market prices in effect on the valuation date. Because our
debt outstanding does not trade in active markets, we used interest rates for outstanding debt issues that
actively trade and have similar characteristics such as size, credit ratings, financial terms and
remaining maturities to estimate fair value for our long-term debt issues.

Thousands

Carrying amount
Estimated fair value

8.

Short-term Debt and Credit Facilities

December 31,

2011

2010

$681,700
$808,724

$601,700
$690,126

Our primary source of short-term funds is from the sale of commercial paper and bank
loans. In addition to issuing commercial paper or bank loans to meet seasonal working capital
requirements, short-term debt is used temporarily to fund capital requirements. Commercial paper and
bank loans are periodically refinanced through the sale of long-term debt or equity securities. Our
commercial paper program is supported by one or more committed credit facilities. At December 31,
2011 and 2010, the amounts and average interest rates of commercial paper debt outstanding were
$141.6 million at 0.3 percent and $257.4 million at 0.4 percent, respectively. There were no bank loans
outstanding at December 31, 2011 or 2010.

At NW Natural, we have a multi-year $250 million syndicated credit agreement, pursuant to

which we may extend commitments for additional one-year periods subject to lender approval. We
extended commitments under this syndicated agreement to May 31, 2013. The syndicated agreement
allows us to request increases in the total commitment amount from time to time, up to a maximum
amount of $400 million, and to replace any lenders who decline to extend the terms of the agreement.
The syndicated agreement also permits the issuance of letters of credit in an aggregate amount up to
the applicable total borrowing commitment. Any principal and unpaid interest owed on borrowings
under the syndicated agreement are due and payable on or before the expiration date. There were no
outstanding balances under the syndicated credit agreement and no letters of credit issued or
outstanding at December 31, 2011 and 2010.

The syndicated credit agreement requires that we maintain credit ratings with Standard &

Poor’s (S&P) and Moody’s Investors Service, Inc. (Moody’s) and notify the lenders of any change in

106

our senior unsecured debt ratings by such rating agencies. A change in our debt ratings is not an event
of default, nor is the maintenance of a specific minimum level of debt rating a condition of drawing
upon the credit facility. However, interest rates on any loans outstanding under the credit facility are
tied to debt ratings, which would increase or decrease the cost of any loans under the credit facility
when ratings are changed. There were no changes in our credit ratings during 2011.

The syndicated credit agreement also requires us to maintain a consolidated indebtedness to
total capitalization ratio of 70 percent or less. Failure to comply with this covenant would entitle the
lenders to terminate their lending commitments and accelerate the maturity of all amounts outstanding.
We were in compliance with this covenant at December 31, 2011 and 2010.

9.

Pension and Other Postretirement Benefits

We maintain two qualified non-contributory defined benefit pension plans covering a majority

of our regular NW Natural employees with more than one year of service, several non-qualified
supplemental pension plans for eligible executive officers and certain key employees and other
postretirement employee benefit plans. We also have a qualified defined contribution plan (Retirement
K Savings Plan) for all eligible employees. Only the two qualified defined benefit pension plans and
Retirement K Savings Plan have plan assets, which are held in a qualified trust to fund retirement
benefits. Effective January 1, 2007 and 2010, the qualified defined benefit retirement plans and
postretirement benefits for non-union employees and for union employees, respectively, were closed to
new participants. These plans were not available to employees of our NW Natural subsidiaries. Non-
union and union employees hired or re-hired after December 31, 2006 and 2009, respectively, and
employees of NW Natural subsidiaries are provided an enhanced Retirement K Savings Plan benefit.
Also, effective January 1, 2007, the postretirement Welfare Benefit Plan for Non-Bargaining Unit
Employees was closed to new participants after December 31, 2006.

107

The following table provides a reconciliation of the changes in benefit obligations and fair

value of plan assets, as applicable, for the pension and other postretirement benefit plans, excluding the
Retirement K Savings Plan, for the years ended December 31, 2011, 2010, and 2009, and a summary
of the funded status and amounts recognized in the consolidated balance sheets using measurement
dates as of December 31, 2011, 2010 and 2009:

Thousands

Reconciliation of change in

benefit obligation:
Obligation at January 1
Service cost
Interest cost
Net actuarial (gain) or loss
Benefits paid
Plan amendments

Postretirement Benefit Plans

Pension Benefits
2010

2011

2009

2011

Other Benefits
2010

2009

$ 339,338
7,122
18,134
44,802
(18,269)
-

$ 307,991
6,688
18,029
25,275
(18,645)
-

$ 281,127
6,402
17,948
23,584
(17,149)
(3,921)

$ 27,676
614
1,404
2,225
(1,870)
-

$ 24,741
588
1,436
2,387
(1,476)
-

$ 23,863
522
1,568
216
(1,428)
-

Obligation at December 31

$ 391,127

$ 339,338

$ 307,991

$ 30,049 $ 27,676

$ 24,741

Reconciliation of change in plan

assets:
Fair value of plan assets at

January 1

Actual return on plan assets
Employer contributions
Benefits paid

Fair value of plan assets at

$ 219,014
(6,684)
21,909
(18,269)

$ 201,312
24,651
11,696
(18,645)

$ 163,115
28,641
26,705
(17,149)

$

-
-
1,870
(1,870)

$

-
-
1,476
(1,476)

$

-
-
1,428
(1,428)

December 31

$ 215,970

$ 219,014

$ 201,312

$

-

$

-

$

-

Funded status at December 31

$(175,157) $(120,324) $(106,679) $(30,049) $(27,676) $(24,741)

Our qualified defined benefit pension plans had an aggregate projected benefit obligation of

$362.9 million, $314.5 million and $285.2 million at December 31, 2011, 2010, and 2009,
respectively, and the fair value of plan assets was $216.0 million, $219.0 million and $201.3 million,
respectively. Changes in certain pension assumptions impact our projected benefit obligations. Benefit
obligations at December 31, 2011 increased $40.3 million due to decreases in our discount rate
assumptions and increased by $0.9 million due to changes in other assumptions. The projected benefit
obligations at December 31, 2010 increased $17.9 million over the prior year due to decreases in our
discount rate assumptions and increased by $6.5 million due to changes in other assumptions.

108

The following table provides amounts amortized from accumulated other comprehensive

income (AOCI) or regulatory assets to net periodic benefit cost during 2011, 2010, and 2009:

Regulatory Asset Amortization

Pension Benefits
2010

2011

2009

Other Postretirement Benefits
2010

2009

2011

AOCI Amortization
Pension Benefits
2010

2011

2009

Thousands

Net periodic benefit costs:

Actuarial loss
Prior service cost
Transition obligation

$10,731
230
-

$6,740
230
-

$6,189
1,260
-

Total

$10,961

$6,970

$7,449

$289
197
411

$897

$131
197
411

$739

$ 17
197
411

$625

$854
122
-

$976

$707
(43)
-

$449
(37)
-

$664

$412

In 2012, an estimated $15.5 million will be amortized from regulatory assets to net periodic

benefit costs, consisting of $14.7 million of actuarial losses, $0.4 million of prior service costs and $0.4
million of transition obligations, and $1.0 million will be amortized from AOCI to earnings related to
actuarial losses.

Our assumed discount rate was determined independently for each pension plan and other

postretirement benefit plan based on the Citigroup Above Median Curve (discount rate curve) using
high quality bonds (i.e. rated AA- or higher by S&P or Aa3 or higher by Moody’s). The discount rate
curve was then applied to match the estimated cash flows in each plan to reflect the timing and amount
of expected future benefit payments for these plans.

The assumption for expected long-term rate of return on plan assets was developed as a

weighted average of the expected earnings for the target asset portfolio. In developing the expected
long-term rate of return assumption, consideration was given to the historical performance of each
asset class in which the plans’ assets are invested and the target asset allocation for plan assets.

Our investment strategy and policies for the qualified pension plan assets held in the

Retirement Trust Fund were approved by our retirement committee, which is composed of senior
management employees with the assistance of an investment consultant. The policies set forth the
guidelines and objectives governing the investment of plan assets. Plan assets are invested for total
return with appropriate consideration for liquidity and portfolio risk. All investments are expected to
satisfy the requirements of the rule of prudent investments as set forth under the Employee Retirement
Income Security Act of 1974. The approved asset classes include cash and short-term investments,
fixed income, common stock and convertible securities, absolute and real return strategies, real estate
and investments in our common stock. Plan assets may be invested in separately managed accounts or
in commingled or mutual funds. Investment re-balancing takes place periodically as needed, or when
significant cash flows occur, in order to maintain the allocation of assets within the stated target
ranges. Our expected long-term rate of return is based upon historical index returns by asset class,
adjusted by a factor based on our historical return experience, diversified asset allocation and active
portfolio management by professional investment managers. The Retirement Trust Fund is not
currently invested in any NW Natural securities.

109

The following is our pension plan asset target allocation at December 31, 2011:

Asset Category

U.S. large cap equity
U.S. small/mid cap equity
Non-U.S. equity
Emerging markets equity
Long government/credit
High yield
Emerging market debt
Real estate funds
Absolute return strategy
Real return strategy

Target
Allocation

15.0%
10.0%
14.5%
3.5%
24.0%
5.0%
5.0%
5.8%
12.0%
5.2%

Our non-qualified supplemental defined benefit pension benefit obligations were $28.2

million, $24.9 million and $22.8 million at December 31, 2011, 2010 and 2009, respectively. These
plans are not subject to regulatory deferral and the changes in actuarial gains and losses, prior service
costs and transition assets or obligations are recognized in AOCI under common stock equity, net of
tax, until they are amortized as a component of net periodic benefit cost. Although these are unfunded
plans with no plan assets due to their nature as non-qualified plans, we indirectly fund a portion of our
obligations with company- and trust-owned life insurance.

Our plans for providing postretirement benefits other than pensions also are unfunded plans,
but are subject to regulatory deferral. The gains and losses, prior service costs and transition assets or
obligations for these plans were recognized as a regulatory asset.

Net periodic benefit cost consists of service costs, interest costs, the amortization of actuarial

gains and losses, the expected returns on plan assets and, in part, on a market-related valuation of
assets. The market-related valuation reflects differences between expected returns and actual
investment returns, which are recognized over a three-year period or less from the year in which they
occur, thereby reducing year-to-year net periodic benefit cost volatility.

The following tables provide the components of net periodic benefit cost for the qualified and
non-qualified pension and other postretirement benefit plans for the years ended December 31, 2011,
2010 and 2009 and the assumptions used in measuring these costs and benefit obligations:

Thousands

Service cost
Interest cost
Expected return on plan assets
Amortization of transition obligations
Amortization of prior service costs
Amortization of net actuarial loss

Net periodic benefit cost

Amount allocated to construction
Amount deferred to regulatory

balancing account

Pension Benefits
2010
$ 6,688
18,029
(18,207)
-
187
7,447

2011
$ 7,122
18,134
(17,867)
-
352
11,584

2009
$ 6,402
17,948
(15,696)
-
1,223
6,810

Other Postretirement
Benefits
2010
$ 588
1,436
-
411
197
131

2011
$ 614
1,404
-
411
197
289

2009
$ 522
1,568
-
411
197
-

19,325
(4,905)

14,144
(3,729)

16,687
(4,636)

2,915
(878)

2,763
(904)

2,698
(858)

(6,008)

-

-

-

-

-

Net amount charged to expense

$ 8,412

$ 10,415

$ 12,051

$2,037

$1,859

$1,840

110

Assumptions for net periodic benefit

cost:
Weighted-average discount rate
Rate of increase in compensation
Expected long-term rate of return

Assumptions for funded status:

Weighted-average discount rate
Rate of increase in compensation
Expected long-term rate of return

Pension Benefits
2010

2011

2009

Other Postretirement
Benefits
2010

2011

2009

5.49%

6.01%

3.25-5.0% 3.25-5.0% 3.25-5.0%
8.25%

8.25%

8.25%

6.60% 5.16% 5.78% 7.12%
n/a
n/a

n/a
n/a

n/a
n/a

4.51%

5.49%

3.25-5.0% 3.25-5.0% 3.25-5.0%
8.25%

8.25%

8.00%

6.01% 4.33% 5.16% 5.78%
n/a
n/a

n/a
n/a

n/a
n/a

The assumed annual increase in health care cost trend rates used in measuring other
postretirement benefits as of December 31, 2011 were 8.0 percent for medical and 10.0 percent for
prescription drugs. Medical costs and prescription drugs are assumed to decrease gradually each year
to a rate of 5.0 percent by 2021.

Assumed health care cost trend rates can have a significant effect on the amounts reported for

the health care plans. A one percentage point change in assumed health care cost trend rates would
have the following effects:

Thousands

Effect on net periodic postretirement health care benefit cost
Effect on the accumulated postretirement benefit obligation

1% Increase

1% Decrease

$ 67
$678

$ (60)
$(613)

The impact of a change in retirement benefit costs on operating results would be less than the
amounts shown above because 30 to 40 percent of these amounts would be capitalized to construction
accounts as payroll overhead and included in utility plant, and a certain amount of increases or
decreases could be recorded to the regulatory balancing account for pensions, with the remaining
amount recognized in current earnings.

111

The following table provides information regarding employer contributions and benefit

payments for the two qualified pension plans, non-qualified pension plans and other postretirement
benefit plans for the years ended December 31, 2011 and 2010, and estimated future contributions and
payments:

Thousands

Employer Contributions

Pension Benefits

Other Benefits

2010
2011
2012 (estimated)

Benefit Payments

2009
2010
2011

Estimated Future Payments

2012
2013
2014
2015
2016
2017-2021

$ 12,088
22,325
30,109

17,149
18,645
18,269

19,374
19,620
20,107
20,640
21,284
122,680

$ 1,476
1,870
2,056

1,428
1,476
1,870

2,056
2,083
2,138
2,149
2,198
11,298

We make contributions to our qualified defined benefit pension plans based on actuarial

assumptions and estimates, tax regulations and funding requirements under federal law. The Pension
Protection Act of 2006 (the Act) established new funding requirements for defined benefit plans. The
Act establishes a 100 percent funding target over seven years for plan years beginning after
December 31, 2008. Our qualified defined benefit pension plans are currently underfunded by $146.9
million at December 31, 2011, and we expect to make contributions during 2012 of approximately $28
million.

The Retirement K Savings Plan provided to our employees is a qualified defined contribution
plan under Internal Revenue Code Section 401(k). Our contributions to this plan totaled $2.4 million
2011 and $2.1 million in 2010 and 2009. The Retirement K Savings Plan includes an Employee Stock
Ownership Plan.

The supplemental deferred compensation plans for eligible officers and senior managers are
non-qualified plans. These plans are designed to enhance the retirement savings of employees and to
assist them in strengthening their financial security by providing an incentive to save and invest
regularly.

In addition to the company-sponsored defined benefit plans referred to above, we contribute to

a multiemployer pension plan for our bargaining unit employees known as the Western States Office
and Professional Employees International Union Pension Fund (Western States Plan) in accordance
with our collective bargaining agreement. The employer identification number of the plan is
94-6076144. The cost of this plan is in addition to pension expense in the table above. The Western
States Plan is managed by a board of trustees that includes equal representation from participating
employers and labor unions. Contribution rates are established by collective bargaining agreements,
and benefit levels are set by the board of trustees based on the advice of an independent actuary

112

regarding the level of benefits that agreed-upon contributions are expected to support. The Western
States Plan has reported an accumulated funding deficit for the current plan year and remains in critical
status. A plan is considered to be in critical status if its funded status is 65 percent or less. Federal law
requires pension plans in critical status to adopt a rehabilitation plan designed to restore the financial
health of the plan. Rehabilitation plans may specify benefit reductions, contribution surcharges, or a
combination of the two. The Western States Plan trustees adopted a rehabilitation plan that reduced
benefit accrual rates and adjustable benefits for active employee participants and increased future
employer contribution rates. These changes are expected to improve the funded status of the plan. Our
contributions to the Western States Plan amounted to $0.4 million in 2011, 2010 and 2009 which is
greater than 5 percent of the total contributions to the plan by all participants.

This amount includes the 10 percent contribution surcharge. Contribution surcharges above the

current 10 percent rate will be assessed to employer participants, but these higher surcharges will not
go into effect for NW Natural until its next collective bargaining agreement, which is expected to be no
earlier than June 1, 2014. Under the terms of our current collective bargaining agreement, which
became effective in July 2009, we can withdraw from the Western States Plan at any time. However, if
we withdraw and the plan is underfunded, we could be assessed a withdrawal liability. In accordance
with accounting rules for multiemployer plans, we have not currently recognized these potential
withdrawal liabilities on the balance sheet. Currently, we have no intent to withdraw from the plan, so
we have not recorded a withdrawal liability.

Fair Value

Following is a description of the valuation methodologies used for assets measured at fair

value. In cases where the pension plan is invested through a collective trust fund or mutual fund, our
custodian uses the fund’s market value. The custodian also provides the market values for investments
directly owned.

U.S. large cap equity: These are level 1 assets valued at the closing price reported on the

active market on which the individual security is traded. This asset class includes investments
primarily in U.S. common stocks.

U.S. small/mid cap equity: These are level 2 assets valued based on information provided by

the plan’s investment custodians. The financial statements of the commingled fund are audited
annually by independent accountants. Values for such funds are stated at estimated fair values, which
have been determined based on the unit values of the funds. Unit values are determined by the bank
sponsoring such funds by dividing the fund’s net assets at fair value by its units outstanding at the
valuation date. This asset class includes investments primarily in U.S. common stocks.

Non-U.S. equity: These are level 1 and 2 assets. Level 1 assets are valued at the closing price

reported on the active market on which the individual security is traded. Level 2 assets are valued
based on information provided by the plan’s investment custodians. The financial statements of the
commingled fund are audited annually by independent accountants. Values for such funds are stated at
estimated fair values, which have been determined based on the unit values of the funds. Unit values
are determined by the bank sponsoring such funds by dividing the fund’s net assets at fair value by its
units outstanding at the valuation date. This asset class includes investments primarily in foreign equity
common stocks.

113

Emerging market equity: These are level 1 assets valued at the net asset value of the shares

held by the plan at the valuation date. This asset class includes investments primarily in common
stocks in emerging markets.

Fixed income: These are level 1 assets valued at the net asset value of the shares held by the

plan at the valuation date. This asset class includes investments primarily in investment grade debt and
fixed income securities.

Long Government/Credit: These are level 2 assets whose values are determined by closing
values if available and by matrix pricing for illiquid securities. This asset class includes long duration
fixed income investments primarily in U.S. treasuries, U.S. government agencies, municipal securities,
mortgage-backed securities, asset-backed securities, as well as U.S. and international investment-grade
corporate bonds.

Real estate funds: These are level 3 assets valued based on the interest held by the plan, for

which fair values of the underlying investments are subject to appraisal as directed by the funds’
management. This asset class includes a real estate fund that invests directly in real estate. The
underlying properties held in the funds are appraised utilizing the following approaches: the cost
approach (the current cost of replacing the real estate less deterioration and functional and economic
obsolescence); the income approach (the ability of the underlying properties to generate net rental
income); and the comparable sales approach (recent sales of comparable real estate in the same
market). The plan’s ability to redeem these investments is subject to certain restrictions and cash
availability.

Absolute return strategy: These are level 2 assets valued based on information provided by
the plan’s investment custodians. The financial statements of the partnerships are audited annually by
independent accountants, with the value of the underlying investments based on the estimated fair
value of the various holdings in the portfolio as reported in the financial statements at net asset
value. This asset class includes a hedge fund. Our investment normally provides for a quarterly
distribution subject to 95 days advance notice of withdrawal. Currently there are no restrictions on
withdrawal requests, and as of December 31, 2011 we have not submitted a withdrawal request.

Real return strategy: These are level 1 assets valued at the net asset value of the shares held
by the plan at the valuation date. This asset class includes an investment in a broad range of assets and
strategies primarily including fixed income and equity securities, along with commodities.

Cash and cash equivalents: These are level 2 assets valued at the net asset value of the shares
held by the plan at the valuation date. This asset class primarily includes a money market mutual fund.

The preceding valuation methods may produce a fair value calculation that is not indicative of
net realizable value or reflective of future fair values. Although we believe these valuation methods are
appropriate and consistent with other market participants, the use of different methodologies or
assumptions to determine the fair value of certain financial instruments could result in a different fair
value measurement at the reporting date.

Investment securities are exposed to various financial risks including interest rate, market and

credit risks. Due to the level of risk associated with certain investment securities, it is reasonably
possible that changes in the values of our investment securities will occur in the near term and that
such changes could materially affect our investment account balances and the amounts reported as plan
assets available for benefits payments.

114

The following table presents the fair value of plan assets, including outstanding receivables

and liabilities, of the Retirement Trust Fund as of December 31, 2011 and 2010:

Investments, in thousands

U.S. large cap equity
U.S. small/mid cap equity
Non-U.S. equity
Emerging markets equity
Fixed income
Long government/credit
Real estate funds
Absolute return strategy
Real return strategy
Cash and cash equivalents

Total investments

Investments, in thousands

U.S. large cap equity
U.S. small/mid cap equity
Non-U.S. equity
Emerging markets equity
Fixed income
Real estate funds
Absolute return strategy
Real return strategy
Cash and cash equivalents

Total investments

Receivables

Accrued interest and dividend income
Due from broker for securities sold

Total receivables

Liabilities
Due to broker for securities purchased

Total investment in retirement trust

Level 1

$ 36,236
-
22,158
10,208
19,121
-
-
-
15,475
-

December 31, 2011
Level 2 Level 3

$

-
27,310
11,587
-
-
18,897
-
30,475
-
9,290

$

-
-
-
-
-
-
15,317
-
-
-

Total

$ 36,236
27,310
33,745
10,208
19,121
18,897
15,317
30,475
15,475
9,290

$103,198

$97,559

$15,317

$216,074

Level 1

$ 37,231
-
24,630
11,476
36,429
-
-
15,452
-

December 31, 2010
Level 2 Level 3

$

-
27,864
14,549
-
-
-
32,378
-
3,629

$

-
-
-
-
-
14,721
-
-
-

Total

$ 37,231
27,864
39,179
11,476
36,429
14,721
32,378
15,452
3,629

$125,218

$78,420

$14,721

$218,359

December 31,

2011

2010

414
321

735

$

$

249
448

697

839

$

42

$

$

$

$215,970

$219,014

115

Level 3 Investments

The following table presents the beginning balance, activity and ending balance of Level 3

investments that have their fair values established using significant unobservable inputs as of
December 31, 2011:

Thousands

January 1, 2011 balance
Total gains or (losses):

Included in earnings (or changes in net assets)

December 31, 2011 balance

10.

Income Tax

Level 3 Assets
Real estate Funds

$14,721

596

$15,317

A reconciliation between income taxes calculated at the statutory federal tax rate and the

provision for income taxes reflected in the consolidated financial statements is as follows:

Thousands, except percentages

Income taxes at federal statutory rate
Increase (decrease):

Current state income tax, net of federal tax benefit
Amortization of investment and energy tax credits
Differences required to be flowed-through by regulatory

commissions

Gains on company and trust-owned life insurance
Other—net

Total provision for income taxes

Effective tax rate

2011

2010

2009

$37,550

$42,745

$42,627

4,945
(442)

1,647
(786)
468

5,803
(525)

1,647
(715)
507

5,568
(593)

(116)
(1,195)
380

$43,382

$49,462

$46,671

40.4%

40.5%

38.3%

The provision (benefit) for current and deferred income taxes consists of the following:

Thousands
Current

Federal
State

Deferred

Federal
State

Total provision for income taxes

Total income taxes paid

2011

2010

2009

$

130
(929)
(799)

$(28,592) $ 6,221
2,300
8,521

1,441
(27,151)

35,481
8,700
44,181
$43,382

69,159
7,454
76,613
$ 49,462

31,937
6,213
38,150
$46,671

$ 1,756

$ 22,600

$10,000

116

The following table summarizes the total provision (benefit) for income taxes for the regulated

utility and non-utility business segments for the three years ended December 31:

Thousands
Regulated utility:
Current
Deferred
Deferred investment and energy tax credits

Non-utility business segments:

Current
Deferred

Total provision for income taxes

2011

2010

2009

$ (4,646) $ (1,464) $
50,152
(422)
45,084

47,741
(525)
45,752

871
40,829
(593)
41,107

3,846
(5,548)
(1,702)
$43,382

(25,687)
29,397
3,710
$ 49,462

7,650
(2,086)
5,564
$46,671

The following table summarizes the tax effect of significant items comprising our deferred

income tax accounts for the two years ended December 31:

Thousands
Deferred tax liabilities:
Plant and property
Regulatory adjustment for income taxes paid
Regulatory income tax assets
Regulatory liabilities
Non-regulated deferred tax liabilities

Total

Deferred tax assets:

Regulatory assets
Unfunded pension and postretirement obligations
Non-regulated deferred tax assets
Alternative minimum tax credit carryforward
Loss and credit carryforwards

Total

Deferred income tax liabilities—net
Deferred investment tax credits
Deferred income taxes and investment tax credits

2011

2010

$292,235
2,106
65,755
35,638
43,373
$439,107

$255,471
5,272
68,822
23,159
34,544
$387,268

$ (4,727) $ (1,402)
(4,342)
(772)
(1,702)
(7,071)
(15,289)
371,979
1,430
$373,409

(5,119)
(1,161)
(1,626)
(14,255)
(26,888)
412,219
990
$413,209

We have determined that we are more likely than not to realize all recorded deferred tax assets

as of December 31, 2011.

We calculate our deferred tax assets and liabilities according to accounting guidance on
income taxes, whereby deferred income taxes are generally determined based on the difference
between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect
in the years in which the differences are expected to reverse. Deferred tax provisions are not recorded
in the income statement for certain temporary differences where regulators require that we flow
through deferred income tax benefits or expenses in the utility ratemaking process.

In September 2010, Congress passed the Unemployment Insurance, Reauthorization and Job
Creation Act of 2010 (the Act) and the legislation was signed into law by President Obama. The Act
extended for one year the temporary bonus depreciation rules first enacted in the Economic Stimulus

117

Act of 2008 and subsequently renewed in the American Recovery and Reinvestment Act of 2009.
Under the bonus depreciation provision, an additional first-year tax deduction was allowed for
depreciation equal to 50 percent of the adjusted basis of qualified property through September 8, 2010,
in the year the property was placed in service, with the remaining percentage recovered under the
normal depreciation rules. In addition, on December 17, 2010, President Barack Obama signed into
law the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 (Tax
Relief Act), which allows 100 percent bonus depreciation for qualified property placed in service
between September 9, 2010 through December 31, 2011. It also extended the 50% bonus depreciation
deduction to qualifying property placed in service through 2012.

In 2011 the Company received a tax refund of $14.4 million for tax year 2010. In addition, the
company carried back a portion of its 2010 net operating loss to tax year 2009 and received a refund of
$22.3 million. In 2011 we filed an amended federal income tax return for 2009, primarily to report a
deduction for repairs expense consistent with a change in accounting method approved by the IRS and
in conformity with the deduction allowed by the IRS in its examination of years 2006-2008. The
Company then amended its net operating loss carryback to tax year 2009. The result of the amended
federal tax return for tax year 2009 and the amended net operating loss carryback is a federal income
tax refund receivable of $3.5 million at December 31, 2011. The company estimates that it has a
consolidated net operating loss carryforward to 2012 of $33.7 million. The net operating loss
carryforward will be carried forward to reduce our current tax liability in future years. We anticipate
that we will be able to utilize the entire net operating loss carryforward before its expiration in twenty
years.

For the year ended December 31, 2010, we reported taxable income for Oregon purposes due
to lack of federal-state conformity with respect to the accelerated depreciation effects cited above. The
Company recorded a current receivable of $3.5 million to reflect the excess of payments applied to
year 2010 over the amount owed. The Company received this refund in the first quarter of 2012. As of
January 1, 2011, Oregon conformed to federal rules including bonus depreciation. As a result, we
anticipate generating an NOL for state purposes in 2011. Oregon does not allow NOL carrybacks, but
allows NOLs to be carried forward for fifteen years. We expect to fully utilize the estimated NOL
generated in 2011.

Uncertain tax positions are accounted for in accordance with accounting standards that require

management’s assessment of the expected treatment of a tax position taken in a filed tax return, or
planned to be taken in a future tax return, that has not been reflected in measuring income tax expense
for financial reporting purposes. Until such positions are sustained by the taxing authorities, we would
not recognize the tax benefits resulting from such positions and would report the tax effect as a liability
in the Company’s consolidated balance sheet. As of December 31, 2011, we had no uncertain tax
positions.

The IRS completed its examination of the 2006 through 2008 tax years in 2011. The

examination resulted in payments of $1.5 million of tax and $0.2 million of interest. The Oregon
Department of Revenue (ODOR) completed its field examination of our 2006 through 2009
consolidated Oregon income tax returns and issued preliminary assessments. If sustained by the
ODOR, these assessments would result in an additional state tax liability of approximately $0.8
million, including interest and penalties. The Company is engaged in discussions with ODOR to
resolve these issues; however, uncertainty exists with respect to the outcome of the audit as a result of
information not yet fully considered by the ODOR. Resolution is expected to be reached within the

118

next 12 months, and we have determined that it is more-likely-than-not that we will prevail on these
issues. As such, no amounts have been recorded in our financial statements as of December 31, 2011
related to this matter.

Interest and penalties related to any future income tax deficiencies are recorded within income

tax expense in the consolidated statements of income.

11.

Property, Plant and Equipment

The following table sets forth the major classifications of our property, plant and equipment

and accumulated depreciation at December 31:

Thousands

Utility plant in service
Utility construction work in progress
Less accumulated depreciation

Utility plant-net

Non-utility plant in service
Non-utility construction work in progress
Less accumulated depreciation

Non-utility plant-net

Total property plant and equipment

2011

2010

$2,323,467
36,051
749,603

$2,247,952
29,324
710,214

1,609,915

1,567,062

293,205
8,379
17,623

283,961

290,038
9,088
12,025

287,101

$1,893,876

$1,854,163

The weighted average depreciation rate for utility assets was 2.8 percent in 2011 and 2010.

The weighted average depreciation rate for non-utility assets was 2.2 percent in 2011 and 2.5 percent in
2010.

Accumulated depreciation does not include the accumulated provision for asset removal costs

of $267.4 million and $252.9 million at December 31, 2011 and 2010, respectively. These accrued
asset removal costs are reflected on the balance sheets as regulatory liabilities (see Note 2, “Plant,
Property and Accrued Asset Removal Costs”).

12.

Gas Reserves and Other Investments

Our gas reserves are stated at cost, net of regulatory amortization, with the associated deferred

tax benefits recorded as liabilities on the balance sheet. Other investments include financial
investments in life insurance policies, which are accounted for at fair value, and equity investments in
certain partnerships and limited liability companies, which are accounted for under the equity or cost
methods. The following table summarizes our other investments at December 31:

Thousands

Investments in life insurance policies
Investments in gas pipeline joint ventures
Other

Total other investments

2011

2010

$51,911
14,340
2,012

$51,090
15,742
2,262

$68,263

$69,094

119

Gas Reserves

We entered into an agreement with Encana to develop physical gas reserves that are expected

to supply a portion of our utility customers’ requirements over the next 30 years. The volume of gas
produced and allocated to us under the agreement will increase in the early years as we continue to
invest in drilling, with volumes expected to peak at about 13 percent of our utility’s gas supply
requirement in gas year 2015-2016. Over the first 10 years of the agreement (2011-2020), volumes are
expected to average approximately 8 to 10 percent of the annual gas purchase requirements of our
utility customers. Under the agreement, we expect to invest approximately $45 million to $55 million
per year for five years, and our total investment is expected to be approximately $250 million.

Upon reviewing the transaction, the OPUC determined that our costs under the agreement will
be recovered on an ongoing basis through its annual PGA mechanism, including the regulatory deferral
and incentive sharing process for the commodity cost of gas. Annually, a forecast will be established
for the amounts related to costs and volumes expected, and any variances between forecasted and
actual will be subject to the PGA incentive sharing in Oregon, up to a maximum variance of $10
million of which 10 percent (or $1 million maximum) would be recognized in current income.
Variances in excess of $10 million, both negative and positive, will be deferred and passed through to
customers in future rates at 100 percent. As part of the decision by the OPUC, we agreed to file a
general rate case in Oregon no later than December 31, 2011.

Encana began drilling in May 2011 under the agreements referred to above, and we are

currently receiving gas from our interests in a section of the gas field. In 2011, volumes from gas
reserves were less than one percent of our total gas purchases. Our net investment at December 31,
2011 is $36.3 million, including deferred tax liabilities totaling $15.6 million.

Variable Interest Entity (VIE) Analysis. We concluded that the arrangements with Encana

qualify as a VIE, but that we are not the primary beneficiary of these activities as defined by the
authoritative guidance related to consolidations due to the fact that our interest represents a minor
portion of total extraction activities. We account for our investment in this VIE on the cost basis, and it
is included under gas reserves on our balance sheet. Our maximum loss exposure related to this VIE is
limited to our investment balance.

Palomar

Palomar, a wholly-owned subsidiary of PGH, is pursuing the development of a new gas
transmission pipeline that would provide an interconnection with our utility distribution system. PGH
is owned 50 percent by NWN Energy and 50 percent by TransCanada American Investments Ltd., an
indirect wholly-owned subsidiary of TransCanada Corporation. PGH is a development stage variable
interest entity.

Variable Interest Entity (VIE) Analysis. As of December 31, 2011, we updated our VIE

analysis and reconfirmed that we are not the primary beneficiary of PGH’s activities as defined by the
authoritative guidance related to consolidations due to the fact that we have a 50 percent share and
there are no stipulations that allow disproportionate influence over the entity. Therefore, we account
for our investment in PGH and the Palomar project under the equity method, which is included in other
investments on our balance sheet. Our maximum loss exposure related to PGH is limited to our equity
investment balance, less our share of any cash or other assets available to us as a 50 percent owner.

120

Impairment Analysis. Our investments in nonconsolidated entities accounted for under the

equity method are reviewed for impairment at each reporting period, and following updates to our
corporate planning assumptions. When it is determined that a loss in value is other than temporary, a
charge is recognized for the difference between the investment’s carrying value and its estimated fair
value. Fair value is based on quoted market prices when available, or on the present value of expected
future cash flows. Differing assumptions could affect the timing and amount of a charge recorded in
any period.

In 2011, our investment in PGH was reviewed for impairment when Palomar withdrew its

original application with the FERC for a proposed natural gas pipeline in Oregon. At the same time,
Palomar informed FERC that it intended to re-file an application to reflect changes in the project
scope, which was expected to eliminate the western portion of the proposed pipeline and align the
revised project with the region’s current and future gas infrastructure needs. Palomar is working with
customers in the Pacific Northwest to further understand their gas transportation needs and determine
the commercial support for a revised pipeline proposal. We expect to file a new FERC certificate
application to reflect a revised scope based on regional needs.

The evaluation of assets related to the west portion of the Palomar pipeline determined that

these costs were impaired, and as a result we recorded a pre-tax charge of $0.3 million for our share of
the project. An evaluation of the assets related to the east portion was also performed in 2011, and a
charge of $1.0 million was recorded. The east segment charge was related to costs that would
potentially be outdated and, if so, would need to be redone for the refiled application. Our remaining
investment balance in Palomar was $13.5 million at December 31, 2011, which consists of costs
related to the east segment. We also determined that our remaining equity investment was not impaired
because the fair value of expected cash flows from planned development of the eastern portion of the
pipeline project exceeds our equity investment. However, if we learn later that the project is not viable
or will not go forward, then we could be required to recognize a maximum charge of up to
approximately $13.2 million based on the current amount of our equity investment net of cash and
working capital at Palomar. We will continue to monitor and update our impairment analysis as
required.

Investment in Life Insurance Policies

We have invested in key person life insurance contracts to provide an indirect funding vehicle

for certain long-term employee and director benefit plan liabilities. The amount in the above table is
reported as cash surrender value, net of policy loans.

13.

Derivative Instruments

We enter into swap, option and combinations of option contracts for the purpose of hedging

natural gas. We primarily use these derivative financial instruments to manage commodity prices
related to our natural gas purchase requirements. A small portion of our derivative hedging strategy
involves foreign currency exchange transactions related to purchases of natural gas from Canadian
suppliers.

In the normal course of business, we enter into indexed-price physical forward natural gas

commodity purchase (gas supply) contracts to meet the requirements of core utility customers. We also
enter into financial derivatives, up to prescribed limits, to hedge price variability related to these

121

physical gas supply contracts. Derivatives entered into prudently for future gas years prior to our
annual PGA filing receive regulatory deferred accounting treatment. Derivative contracts entered into
after the annual PGA rate is set for the current gas contract year are subject to our PGA incentive
sharing mechanism, which provides for either an 80 or a 90 percent deferral of any gains and losses as
regulatory assets or liabilities, with the remaining 10 or 20 percent recognized in current income. All of
our commodity hedging for the 2011-12 gas year was completed prior to the start of the gas year, and
these hedge prices were included in our PGA filing.

Certain natural gas purchases from Canadian suppliers are payable in Canadian dollars,
including both commodity and demand charges, which expose us to adverse changes in foreign
currency rates. Foreign currency forward contracts are used to hedge the fluctuation in foreign
currency exchange rates for our commodity and commodity-related demand charges paid in Canadian
dollars. Foreign currency contracts for commodity costs are purchased on a month-to-month basis
because the Canadian cost is priced at the average noon-day exchange rate for each month. Foreign
currency contracts for demand costs have terms ranging up to 12 months. The gains and losses on the
shorter-term currency contracts for commodity costs are recognized immediately in cost of gas. The
gains and losses on the currency contracts for demand charges are not recognized in current income
because they are subject to a regulatory deferral tariff and, as such, are recorded as a regulatory asset or
liability. The mark-to-market adjustment at December 31, 2011 was an unrealized loss of $0.2
million. This unrealized gain is subject to regulatory deferral and, as such, was recorded as a derivative
instrument, which is offset by recording a corresponding amount to a regulatory liability account.

Derivative hedge contracts are subject to a hedge effectiveness test to determine the financial
statement treatment of each specific derivative. As of December 31, 2011, all of our derivatives were
effective economic hedges and either qualified or were expected to qualify for regulatory deferral or
hedge accounting treatment. The effectiveness test applied to financial derivatives is dependent on the
type of derivative and its use. We use the hypothetical derivative method under accounting standards
for derivatives and hedging to determine the hedge effectiveness for our interest rate swaps and the
dollar offset method for other derivative contracts under accounting standards for derivatives and
hedging. All derivatives were effective as of December 31, 2011.

The following table reflects the income statement presentation for the unrealized gains and
losses from our derivative instruments for the year ended December 31, 2011 and 2010. All of our
currently outstanding derivative instruments are related to regulated utility operations as illustrated by
the derivative gains and losses being deferred to balance sheet accounts in accordance with regulatory
accounting standards.

Thousands

Cost of sales
Other comprehensive income (loss)
Less:
Amounts deferred to regulatory
accounts on balance sheet

Total impact on earnings

2011

2010

Natural gas
commodity (1)

Foreign
exchange (2)

Natural gas
commodity (1)

Foreign
exchange (2)

$(60,799)
-

$

-
(201)

$(52,677)
-

60,799

$

-

201

$

-

52,677

$

-

$

-
91

(91)

$

-

(1)

Unrealized gain (loss) from natural gas commodity hedge contracts is recorded in cost of sales and reclassified to
regulatory deferral accounts on the balance sheet.

122

(2) Unrealized gain (loss) from foreign exchange forward purchase contracts is recorded in other comprehensive

income, and reclassified to regulatory deferral accounts on the balance sheet.

No collateral was posted with or by our counterparties as of December 31, 2011 or 2010. We

attempt to minimize the potential exposure to collateral calls by counterparties to manage our liquidity
risk. Counterparties generally allow a certain credit limit threshold before requiring us to post collateral
against loss positions. Given our counterparty credit limits and diversification, we have not been
subject to collateral calls in 2010 or 2011. Our collateral call exposure is set forth under credit support
agreements, which generally contain credit limits. We could also be subject to collateral call
exposure where we have agreed to provide adequate assurance, which is not specific as to the amount
of credit limit allowed, but could potentially require additional collateral in the event of a material
adverse change. Based upon current contracts outstanding, which reflect unrealized losses of $63.5
million at December 31, 2011, we have estimated the level of collateral demands, with and without
potential adequate assurance calls, using current gas prices and various downgrade credit rating
scenarios for NW Natural as follows:

Thousands

Credit Rating Downgrade Scenarios

(Current
Ratings)
A+/A3 BBB+/Baa1 BBB/Baa2

BBB-/Baa3

Speculative

With Adequate Assurance Calls
Without Adequate Assurance Calls

$-
$-

$-
$-

$2,013
$ 851

$9,585
$5,923

$45,869
$37,206

As of December 31, 2011 and 2010, we realized net losses of $56.5 million and $61.0 million,

respectively, from the settlement of natural gas hedge contracts at maturity, which were recorded as
increases to the cost of gas. The currency exchange rate in all foreign currency forward purchase
contracts is included in our purchased cost of gas at settlement; therefore, no gain or loss is recorded
from the settlement of those contracts.

We are exposed to derivative credit risk primarily through securing pay-fixed natural gas

commodity swaps to hedge the risk of price increases for our natural gas purchases on behalf of
customers. We utilize master netting arrangements through International Swaps and Derivatives
Association contracts to minimize this risk along with collateral support agreements with
counterparties based on their credit ratings. In certain cases we require guarantees or letters of credit
from counterparties in order for them to meet our minimum credit requirement standards.

Our financial derivatives policy requires counterparties to have a certain investment-grade

credit rating at the time the derivative instrument is entered into, and the policy specifies limits on the
contract amount and duration based on each counterparty’s credit rating. We do not speculate on
derivatives; instead we utilize derivatives to hedge our exposure above risk tolerance limits. Any
increase in market risk created by the use of derivatives should be offset by the exposures they modify.

We actively monitor our derivative credit exposure and place counterparties on hold for

trading purposes or require other forms of credit assurance, such as letters of credit, cash collateral or
guarantees as circumstances warrant. Our ongoing assessment of counterparty credit risk includes
consideration of credit ratings, credit default swap spreads, bond market credit spreads, financial
condition, government actions and market news. We utilize a Monte-Carlo simulation model to
estimate the change in credit and liquidity risk from the volatility of natural gas prices. We use the
results of the model to establish earnings-at-risk trading limits. Our credit risk for all outstanding
derivatives at December 31, 2011 currently does not extend beyond October 2013.

123

We could become materially exposed to credit risk with one or more of our counterparties if
natural gas prices experience a significant increase. If a counterparty were to become insolvent or fail
to perform on its obligations, we could suffer a material loss, but we would expect such loss to be
eligible for regulatory deferral and rate recovery, subject to prudency review. All of our existing
counterparties currently have investment-grade credit ratings.

Fair Value

In accordance with fair value accounting, we include nonperformance risk in calculating fair

value adjustments. This includes a credit risk adjustment based on the credit spreads of our
counterparties when we are in an unrealized gain position, or on our own credit spread when we are in
an unrealized loss position. Our assessment of non-performance risk is generally derived from the
credit default swap market and from bond market credit spreads. The impact of the credit risk
adjustments for all outstanding derivatives was immaterial to the fair value calculation at December 31,
2011. As of December 31, 2011 and 2010, the fair value was a liability of $61.0 million and $52.6
million, respectively, using significant other observable, or level 2, inputs. We have used no level 3
inputs in our derivative valuations. We also did not have any transfers between level 1 or level 2 during
the years ended December 31, 2011 and 2010.

14.

Leases

We lease land, buildings and equipment under agreements that expire in various years through

2095. Rental expense under operating leases was $5.4 million, $5.1 million and $5.3 million for the
years ended December 31, 2011, 2010 and 2009, respectively. The table below reflects the future
minimum lease payments due under non-cancelable leases at December 31, 2011. These commitments
relate principally to the lease of our office headquarters, underground gas storage facilities, vehicles
and computer equipment.

Thousands

Operating leases
Capital leases

2012

2013

2014

2015

2016

Later
years

Total

$4,929
443

$4,841
313

$5,078
118

$5,042
23

$5,018
-

$24,659
-

$49,567
897

Minimum lease payments

$5,372

$5,154

$5,196

$5,065

$5,018

$24,659

$50,464

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15.

Commitments and Contingencies

Gas Purchase and Pipeline Capacity Purchase and Release Commitments

We have signed agreements providing for the reservation of firm pipeline capacity under

which we are required to make fixed monthly payments for contracted capacity. The pricing
component of the monthly payment is established, subject to change, by U.S. or Canadian regulatory
bodies. In addition, we have entered into long-term sale agreements to release firm pipeline
capacity. We also enter into short-term and long-term gas purchase agreements. The aggregate
amounts of these agreements were as follows at December 31, 2011:

Thousands

2012
2013
2014
2015
2016
Thereafter

Total
Less: Amount representing interest

Gas
Purchase
Agreements

Pipeline
Capacity
Purchase
Agreements

Pipeline
Capacity
Release
Agreements

$ 98,534
18,331
15,290
5,651
-
-

137,806
682

$ 91,027
87,983
82,898
72,316
61,358
287,541

683,123
99,252

$3,464
-
-
-
-
-

3,464
2

$3,462

Total at present value

$137,124

$583,871

Our total payments for fixed charges under capacity purchase agreements in 2011, 2010 and

2009 were $94.2 million, $91.4 million and $84.6 million, respectively. Included in the amounts were
reductions for capacity release sales of $3.1 million for 2011 and $4.2 million for 2010 and 2009. In
addition, per-unit charges are required to be paid based on the actual quantities shipped under the
agreements. In certain take-or-pay purchase commitments, annual deficiencies may be offset by
prepayments subject to recovery over a longer term if future purchases exceed the minimum annual
requirements.

Environmental Matters

We own, or previously owned, properties that may require environmental remediation or

action. We recognize an environmental liability when it is probable the liability exists and the amount
is reasonably estimable. We estimate the duration and extent of our remediation obligations based upon
reports of outside consultants; internal analyses of clean-up costs and ongoing monitoring costs;
communications with regulatory agencies; and changes in environmental law. If we were to determine
that our estimates of the duration or extent of our environmental obligations were no longer accurate,
we would adjust our environmental liabilities accordingly in the period that such determination is
made. Estimated future expenditures for environmental remediation are not discounted to their present
value. Accrued environmental liabilities are not reduced by potential insurance reimbursements. We
continue to study and evaluate the extent of our potential environmental liabilities, but due to the
numerous uncertainties surrounding the course of environmental remediation and the preliminary
nature of several site investigations, in some cases, we may not be able to reasonably estimate the high
end of the range of possible loss which could be material. In those cases we have disclosed the nature
of the potential loss and the fact that the high end of the range cannot be reasonably estimated.

125

We estimate the range of loss for environmental liabilities using current technology, enacted

laws and regulations, industry experience gained at similar sites and an assessment of the probable
level of involvement and financial condition of other potentially responsible parties. Unless there is an
estimate within this range of possible losses that is more likely than other cost estimates, we record the
liability at the lower end of this range. It is likely that changes in these estimates and ranges will occur
throughout the remediation process for each of these sites due to uncertainty concerning our
responsibility, the complexity of environmental laws and regulations and the selection of potentially
compliant remediation alternatives. The status of each of the sites currently under investigation is
provided below.

We regularly review our environmental liability for each site where we may be exposed to

remediation responsibilities. The costs of environmental remediation are difficult to estimate. A
number of steps are involved in each environmental remediation effort, including site investigations,
remediation, operations and maintenance, monitoring and site closure. Each of these steps may, over
time, involve a number of alternative actions, each of which can change the course and scope of the
effort. Many of these steps are dependent upon the approval and direction of federal and state
environmental regulators. The policies, determinations and directions of the regulators may develop
and change over time and different regulators may take different positions on the various steps,
creating further uncertainty as to the timing and scope of remediation activities. In certain cases, in
addition to us, there are a number of other potentially responsible parties, each of which, in
proceedings and negotiations with other potentially responsible parties and regulators, may influence
the course and scope of the remediation effort. The allocation of liabilities among the potentially
responsible parties is often subject to dispute and can be highly uncertain. The events giving rise to
environmental liabilities often occurred many decades ago, which complicates the determination of
allocating liabilities among potentially responsible parties. Site investigations and remediation efforts
often develop slowly over many years. In addition, disputes may arise between potentially responsible
parties and regulators as to the severity of particular environmental matters and what remediation
efforts are appropriate. These disputes could lead to adversarial administrative proceedings or
litigation, with uncertain outcomes.

Gasco site. We own property in Multnomah County, Oregon that is the site of a former gas

manufacturing plant that was closed in 1956 (Gasco site). The Gasco site has been under investigation
by us for environmental contamination under the Oregon Department of Environmental Quality’s
(ODEQ) Voluntary Clean-Up Program. In June 2003, we filed a Feasibility Scoping Plan and an
Ecological and Human Health Risk Assessment with the ODEQ, which outlined a range of compliant
remedial alternatives for the most contaminated portion of the Gasco site. In May 2007, we completed
a revised Remediation Investigation Report and submitted it to the ODEQ for review. We also
submitted a Focused Feasibility Study (FFS) for the groundwater source control portion of the Gasco
site, which ODEQ conditionally approved in March 2008, subject to the submission of additional
information. We provided that information to ODEQ and are now working with the agency on the final
design of the source control system. Based on the information currently available for groundwater
source control at the Gasco site and our current assumptions regarding remediation, we have estimated
a range of liability between $11 million and $30 million, for which we have recorded an accrued
liability of $12 million at December 31, 2011. The range of liability will be reassessed when ODEQ
makes a final source control design decision, expected later this year.

In addition to groundwater source control, we signed a joint Order on Consent with the
Environmental Protection Agency (EPA), which requires us to design remedial action for sediments

126

from the Gasco site. This design project is underway. We also have other investigation and clean-up
work, including potential work on the uplands portion of the Gasco site. For the sediments project and
upland work, we have recorded an additional accrued liability of $49.2 million, which reflects the low
end of the range of potential liability. We have accrued at the low end of the range of potential liability
for the work at the Gasco site because no amount within the range is considered to be more likely than
another, and the high end of the range cannot reasonably be estimated. However, during 2012, we
expect EPA to complete a feasibility study that will provide additional cost information about the
sediment cleanup work.

Siltronic site. We previously owned property adjacent to the Gasco site that now is the

location of a manufacturing plant owned by Siltronic Corporation (Siltronic site). We are currently
conducting an investigation of manufactured gas plant wastes on the uplands at this site for the
ODEQ. The liability accrued at December 31, 2011 for the Siltronic site is $1.0 million, which is at the
low end of the range of potential liability because no amount within the range is considered to be more
likely than another, and the high end of the range cannot reasonably be estimated.

Portland Harbor site. In 1998, the ODEQ and the EPA completed a study of sediments in a

5.5-mile segment of the Willamette River (Portland Harbor) that includes an area adjacent to the Gasco
and Siltronic sites. The Portland Harbor was listed by the EPA as a Superfund site in 2000 and we were
notified that we are a potentially responsible party. We then joined with other potentially responsible
parties, referred to as the Lower Willamette Group, to fund environmental studies in the Portland
Harbor to allow the EPA to develop a feasibility study. Subsequently, the EPA approved a
Programmatic Work Plan, Field Sampling Plan and Quality Assurance Project Plan for the Portland
Harbor Remedial Investigation/Feasibility Study (RI/FS), completion of which is scheduled for 2012.
The EPA and the Lower Willamette Group are conducting more focused studies on approximately nine
miles of the lower Willamette River, including the 5.5-mile segment previously studied by the EPA.
Further, in August 2008, we signed a cooperative agreement with the Portland Harbor Natural
Resource Trustee Council to participate in a phased natural resource damage (NRD) assessment. The
NRD assessment is intended to identify additional information necessary to estimate further liabilities
to support an early restoration-based settlement of natural resource damage claims. During 2012, the
Lower Willamette Group will submit a draft feasibility study for this site to EPA, resulting in more
information regarding the scope of potential costs. We expect that the feasibility study will allow us to
estimate a range of potential liability and that the range may include significant estimates of potential
liability. As of December 31, 2011, we have a liability accrued of $8.2 million for this site, which is at
the low end of the range of the potential liability because no amount within the range is considered to
be more likely than another, and the high end of the range cannot reasonably be estimated.

Central Service Center site. In 2006, we received notice from the ODEQ that our Central
Service Center in southeast Portland (Central Service Center site) was assigned a high priority for
further environmental investigation. Previously there were three manufactured gas storage tanks on the
premises. The ODEQ believes there could be site contamination associated with releases of condensate
from stored manufactured gas as a result of historic gas handling practices. In the early 1990s, we
excavated waste piles and much of the contaminated surface soils and removed accessible waste from
some of the abandoned piping. In early 2008, we received notice that this site was added to the
ODEQ’s list of sites where releases of hazardous substances have been confirmed and to its list where
additional investigation or cleanup is necessary. We are currently performing an environmental
investigation of the property with the ODEQ’s Independent Cleanup Pathway. As of December 31,
2011, we have a liability accrued of $0.5 million for investigation at this site. The estimate is at the low

127

end of the range of potential liability because no amount within the range is considered to be more
likely than another and the high end of the range cannot reasonably be estimated.

Front Street site. The Front Street site was the former location of a gas manufacturing plant
we operated. It is near but outside the geographic scope of the current Portland Harbor site sediment
studies. The EPA directed the Lower Willamette Group to collect a series of surface and subsurface
sediment samples off the river bank adjacent to where that facility was located. Based on the results of
that sampling, the EPA notified the Lower Willamette Group that additional sampling would be
required. As the Front Street site is upstream from the Portland Harbor site, the EPA agreed that we
could manage the site separately from the Portland Harbor site under ODEQ authority. We submitted
work plans for source control investigation and a historical report to ODEQ and completed initial
studies. In 2010, ODEQ required additional studies which are underway. As of December 31, 2011, we
have an estimated liability accrued of $1.7 million for the study of the sediments and riverbank
groundwater and soils at the site. The estimate is at the low end of the range of potential liability
because no amount within the range is considered to be more likely than another and the high end of
the range cannot reasonably be estimated.

Oregon Steel Mills site. See “Other Legal Proceedings,” below.

Accrued Liabilities Relating to Environmental Sites. The following table summarizes the

accrued liabilities relating to environmental sites at December 31, 2011 and 2010:

Thousands
Gasco site
Siltronic site
Portland Harbor site
Central Service Center site
Front Street site
Other sites

Total

Current Liabilities

Non-Current Liabilities

2011
$16,510
887
1,089
-
1,697
-

$20,183

2010
$11,366
720
2,304
5
1
-

$14,396

2011
$44,697
128
7,066
495
-
120

$52,506

2010
$38,921
201
5,784
510
1,097
108

$46,621

Regulatory and Insurance Recovery for Environmental Costs. In May 2003, the OPUC

approved our request to defer unreimbursed environmental costs associated with certain named sites,
including those described above. Beginning in 2006, the OPUC granted us additional authorization to
accrue carrying costs on deferred environmental cost balances, subject to an annual demonstration that
we have maximized our insurance recovery or made substantial progress in securing insurance
recovery for unrecovered environmental expenses. Through a series of extensions, the authorized cost
deferral and carrying cost accrual was extended through January 2012. We have filed a request with
the OPUC to reauthorize this deferral and expect reauthorization during the first half of 2012. In
addition, we filed a request with the WUTC in January 2011 to defer certain environmental costs
associated with services provided to Washington customers. We received an order from the WUTC on
June 20, 2011 granting that request. Environmental costs related to Washington are being deferred as
of January 26, 2011 with cost recovery to be determined in a future proceeding.

On a cumulative basis, we have recognized a total of $124.8 million for environmental costs,
including legal, investigation, monitoring and remediation costs, including $4.9 million accrued and
paid prior to regulatory deferral order approval. At December 31, 2011, we had a regulatory asset of
$105.7 million for deferred environmental costs.

128

In December 2010, NW Natural commenced litigation against certain of its historical liability

insurers in Multnomah County Circuit Court, State of Oregon (see Item 3. Legal Proceedings). NW
Natural seeks damages in excess of $50 million in losses it has incurred to date, as well as declaratory
relief for additional losses it expects to incur in the future. In December 2011, NW Natural reached a
settlement with Associated Electric & Gas Insurance Services Limited and dismissed that insurer from
the litigation.

Other Legal Proceedings

We are subject to claims and litigation arising in the ordinary course of business. We do not

expect that the ultimate disposition of any of these matters, including the matter described below, will
have a material effect on our financial condition, results of operations or cash flows.

Oregon Steel Mills site. In 2004, NW Natural was served with a third-party complaint by the
Port of Portland (Port) in a Multnomah County Circuit Court case, Oregon Steel Mills, Inc. v. The Port
of Portland. The Port alleges that in the 1940s and 1950s petroleum wastes generated by our
predecessor, Portland Gas & Coke Company, and 10 other third-party defendants were disposed of in a
waste oil disposal facility operated by the United States or Shaver Transportation Company on
property then owned by the Port and now owned by Oregon Steel Mills. The complaint seeks
contribution for unspecified past remedial action costs incurred by the Port regarding the former waste
oil disposal facility as well as a declaratory judgment allocating liability for future remedial action
costs. No date has been set for trial. Although the final outcome of this proceeding cannot be predicted
with certainty, we do not expect that the ultimate disposition of this matter will have a material effect
on our financial condition, results of operations or cash flows.

129

NORTHWEST NATURAL GAS COMPANY
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Thousands, except per share amounts
2011
Operating revenues
Net operating revenues
Net income (loss)
Basic earnings (loss) per share
Diluted earnings (loss) per share

2010
Operating revenues
Net operating revenues
Net income (loss)
Basic earnings (loss) per share
Diluted earnings (loss) per share

Quarter ended

March 31

June 30

Sept. 30 Dec. 31

Total

$323,088
134,508
40,773
1.53
1.53

$161,197
67,232
2,193
0.08
0.08

$93,313
47,783
(8,312)
(0.31)
(0.31)

$271,198
119,910
29,244
1.09
1.09

$848,796
369,433
63,898

2.39 (1)
2.39 (1)

$286,529
130,926
43,608
1.64
1.64

$162,365
72,193
6,888
0.26
0.26

$95,067
46,211
(7,420)
(0.28)
(0.28)

$268,145
118,251
29,591
1.11
1.11

$812,106
367,581
72,667

2.73 (1)
2.73 (1)

(1)

Quarterly earnings (loss) per share are based upon the average number of common shares outstanding during each
quarter. Because the average number of shares outstanding has changed in each quarter shown, the sum of quarterly
earnings (loss) per share may not equal earnings per share for the year. Variations in earnings between quarterly
periods are due primarily to the seasonal nature of our business.

130

NORTHWEST NATURAL GAS COMPANY
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

COLUMN A

COLUMN B

COLUMN C

COLUMN D COLUMN E

Balance at
beginning
of
period

Additions

Deductions

Charged to
costs
and expenses

Charged to
other
accounts

Net
Write-offs

Balance
at end
of
period

Thousands (year ended Dec. 31)
2011
Reserves deducted in balance sheet from
assets to which they apply:

Allowance for uncollectible accounts

$2,950

$1,919

$-

$1,974

$2,895

2010
Reserves deducted in balance sheet from
assets to which they apply:

Allowance for uncollectible accounts

$3,125

$1,717

$-

$1,892

$2,950

2009
Reserves deducted in balance sheet from
assets to which they apply:

Allowance for uncollectible accounts

$2,927

$4,201

$-

$4,003

$3,125

131

Item 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING

AND FINANCIAL DISCLOSURE

None.

Item 9A.CONTROLS AND PROCEDURES

(a) Evaluation of Disclosure Controls and Procedures

Our management, under the supervision and with the participation of our Chief Executive Officer and
Chief Financial Officer, has completed an evaluation of the effectiveness of the design and operation of
our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities
Exchange Act of 1934, as amended (the “Exchange Act”)). Based upon this evaluation, our Chief
Executive Officer and Chief Financial Officer have concluded that, as of the end of the period covered
by this report, our disclosure controls and procedures were effective to ensure that information required
to be disclosed by us and included in our reports filed or submitted under the Exchange Act is
recorded, processed, summarized and reported within the time periods specified in the Securities and
Exchange Commission rules and forms and that such information is accumulated and communicated to
management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to
allow timely decisions regarding required disclosure.

(b) Changes in Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over
financial reporting, as such term is defined in the Exchange Act Rule 13a-15(f).

There have been no changes in our internal control over financial reporting that occurred during the
quarter ended December 31, 2011 that have materially affected, or are reasonably likely to materially
affect, our internal control over financial reporting. The statements contained in Exhibit 31.1 and
Exhibit 31.2 should be considered in light of, and read together with, the information set forth in this
Item 9(a).

Item 9B. OTHER INFORMATION

None.

132

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Information concerning our Board of Directors, its Committees and the Audit Committee

financial expert contained in NW Natural’s definitive Proxy Statement for the May 24, 2012 Annual
Meeting of Shareholders is hereby incorporated by reference. The information concerning “Section
16(a) Beneficial Ownership Reporting Compliance” and “Corporate Governance” contained in our
definitive Proxy Statement for the May 24, 2012 Annual Meeting of Shareholders is hereby
incorporated by reference.

Name

Dec. 31, 2011 Positions held during last five years

Age at

Gregg S. Kantor

David H. Anderson

Margaret D. Kirkpatrick

Lea Anne Doolittle

J. Keith White

David R. Williams

Grant M. Yoshihara

C. Alex Miller

Stephen P. Feltz

MardiLyn Saathoff

54

50

57

56

58

58

56

54

56

55

President and Chief Executive Officer (2009-

); President and Chief
Operating Officer (2007 - 2008); Executive Vice President (2006 -
2007); Senior Vice President, Public and Regulatory Affairs (2003-
2006).

Senior Vice President and Chief Financial Officer (2004-

).

Vice President and General Counsel (2005-
firm of Stoel Rives LLP (1991-2005).

); Partner in the law

Senior Vice President (2008-

); Vice President, Human Resources

(2000-2007).

Vice President, Business Development and Energy Supply/Chief

Strategic Officer (2007-
and Wholesale Services (2005-2006); Managing Director and Chief
Strategic Officer (2003-2005).

); Managing Director, Gas Operations

Vice President, Utility Services (2007-

); Director of Utility

Operations, Districts and managed Labor Relations (2004-2006).

Vice President, Utility Operations (2007-

); Managing Director,
Utility Services (2005-2006); Director, Utility Services (2004-
2005).

Vice President, Finance and Regulation (2009-

); Assistant

Treasurer (2008-
Affairs (2002-2009).

); General Manager of Rates and Regulatory

Assistant Secretary (2007-

); Treasurer and Controller (1999-

).

); Chief Governance Officer and

Deputy General Counsel (2010-
Corporate Secretary (2008-
Assistant General Counsel, Tektronix, Inc. (2005-2008); General
Counsel to Oregon Governor Kulongoski and Business and
Economic Development Advisor (2003-2005).

); Chief Compliance Officer and

David A. Weber

52

President and Chief Executive Officer, NW Natural Gas Storage, LLC

); Interim President and

and Gill Ranch Storage, LLC (2012 -
Chief Executive Officer, NW Natural Gas Storage LLC, and Gill
Ranch Storage, LLC (2011-2012); Chief Operating Officer NW
Natural Gas Storage, LLC and Gill Ranch Storage LLC (November
2010 - January 2011); Managing Director of Information Services
and Chief Information Officer (2005 - 2011); Director of
Information Services and Chief Information Officer (2001-2005).

133

Each executive officer serves successive annual terms; present terms end on May 24, 2012.

There are no family relationships among our executive officers, directors or any person chosen to
become one of our officers or directors.

NW Natural has adopted a Code of Ethics (Code) applicable to all employees and officers that

is available on our website at www.nwnatural.com. We intend to disclose on our website at
www.nwnatural.com any amendments to the Code or waivers of the Code for executive officers.

ITEM 11. EXECUTIVE COMPENSATION

The information concerning “Executive Compensation” and “Report of the Organization and

Executive Compensation Committee” contained in our definitive Proxy Statement for the May 24,
2012 Annual Meeting of Shareholders is hereby incorporated by reference. Information related to
Executive Officers as of December 31, 2011 is reflected in Part III, Item 10, above.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND

MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The following table sets forth information regarding compensation plans under which equity

securities of NW Natural are authorized for issuance as of December 31, 2011 (see Note 6 to the
Consolidated Financial Statements):

(a)

(b)

Number of securities
to be issued upon
exercise of
outstanding options,
warrants and rights

Weighted-average
exercise price of
outstanding options,
warrants and rights

(c)
Number of securities
remaining available for
future issuance under
equity compensation
plans (excluding
securities reflected in
column (a))

118,617
579,225
19,917

3,723

62,831

120,028

904,341

n/a
$42.09
$39.72

n/a

n/a

n/a

337,788
580,650
136,038

n/a

n/a

n/a

1,054,476

Plan Category

Equity compensation plans approved by

security holders:

Long-Term Incentive Plan (LTIP) (Target

Award) (1)

Restated Stock Option Plan
Employee Stock Purchase Plan

Equity compensation plans not approved by

security holders:

Executive Deferred Compensation Plan

(EDCP) (2)

Directors Deferred Compensation Plan

(DDCP) (2)

Deferred Compensation Plan for

Directors and Executives (DCP) (3)

Total

The information captioned “Beneficial Ownership of Common Stock by Directors and
Executive Officers” contained in our definitive Proxy Statement for the May 24, 2012 Annual Meeting
of Shareholders is incorporated herein by reference.

(1)

Shares issued pursuant to the LTIP do not include an exercise price, but are payable when the award criteria are
satisfied. If the maximum awards were paid pursuant to the performance-based awards outstanding at December 31,

134

(2)

(3)

2011, the number of shares shown in column (a) would increase by 118,617 shares and the number of shares shown in
column (c) would decrease by the same amount of shares.
Prior to January 1, 2005, deferred amounts were credited, at the participant’s election, to either a “cash account” or a
“stock account.” If deferred amounts were credited to stock accounts, such accounts were credited with a number of
shares of NW Natural common stock based on the purchase price of the common stock on the next purchase date under
our Dividend Reinvestment and Direct Stock Purchase Plan, and such accounts were credited with additional shares
based on the deemed reinvestment of dividends. Cash accounts are credited quarterly with interest at a rate equal to
Moody’s Average Corporate Bond Yield plus two percentage points, subject to a six percent minimum rate. At the
election of the participant, deferred balances in the stock accounts are payable after termination of Board service or
employment in a lump sum, in installments over a period not to exceed 10 years in the case of the DDCP, or 15 years in
the case of the EDCP, or in a combination of lump sum and installments. We have contributed common stock to the
trustee of the Umbrella Trusts such that the Umbrella Trusts hold approximately the number of shares of common stock
equal to the number of shares credited to all participants’ stock accounts.
Effective January 1, 2005, the EDCP and DDCP were closed to new participants and replaced with the DCP. The DCP
continues the basic provisions of the EDCP and DDCP under which deferred amounts are credited to either a “cash
account” or a “stock account.” Stock accounts represent a right to receive shares of NW Natural common stock on a
deferred basis, and such accounts are credited with additional shares based on the deemed reinvestment of dividends.
Effective January 1, 2007, cash accounts are credited quarterly with interest at a rate equal to Moody’s Average
Corporate Bond Yield. Our obligation to pay deferred compensation in accordance with the terms of the DCP will
generally become due on retirement, death, or other termination of service, and will be paid in a lump sum or in
installments of five or 10 years as elected by the participant in accordance with the terms of the DCP. We have
contributed common stock to the trustee of the Supplemental Trust such that this trust holds approximately the number of
common shares equal to the number of shares credited to all participants stock accounts. The right of each participant in
the DCP is that of a general, unsecured creditor of the Company.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR

INDEPENDENCE

The information captioned “Transactions with Related Persons” and “Corporate Governance”

in the Company’s definitive Proxy Statement for the May 24, 2012 Annual Meeting of Shareholders is
hereby incorporated by reference.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information captioned “2011 and 2010 Audit Firm Fees” in the Company’s definitive
Proxy Statement for the May 24, 2012 Annual Meeting of Shareholders is hereby incorporated by
reference.

135

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as part of this report:

1. A list of all Financial Statements and Supplemental Schedules is incorporated by

reference to Item 8.

2.

List of Exhibits filed:

Reference is made to the Exhibit Index commencing on page 138.

136

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the

registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly
authorized.

Date: February 28, 2012

NORTHWEST NATURAL GAS COMPANY

By:

/s/ Gregg S. Kantor

Gregg S. Kantor

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.

SIGNATURE

TITLE

DATE

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer
/s/ David H. Anderson
David H. Anderson
Senior Vice President
and Chief Financial Officer
/s/ Stephen P. Feltz
Stephen P. Feltz
Treasurer and Controller
/s/ Timothy P. Boyle
Timothy P. Boyle

/s/ Martha L. Byorum

Martha L. Byorum

/s/ John D. Carter

John D. Carter

/s/ Mark S. Dodson

Mark S. Dodson

/s/ C. Scott Gibson

C. Scott Gibson

/s/ Tod R. Hamachek
Tod R. Hamachek

/s/ Jane L. Peverett

Jane L. Peverett

/s/ George J. Puentes

George J. Puentes

/s/ Kenneth Thrasher

Kenneth Thrasher

/s/ Russell F. Tromley

Russell F. Tromley

Principal Executive Officer and Director

February 28, 2012

Principal Financial Officer

February 28, 2012

Principal Accounting Officer

February 28, 2012

Director

Director

Director

Director

Director

Director

Director

Director

Director

Director

137

)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)

February 28, 2012

NORTHWEST NATURAL GAS COMPANY

EXHIBIT INDEX
To
Annual Report on Form 10-K
For Fiscal Year Ended
December 31, 2011

Exhibit Number

Document

*3a.

*3b.

*4a.

*4b.

*4c.

*4d.

Restated Articles of Incorporation, as filed and effective May 31, 2006 and
amended June 3, 2008 (incorporated herein by reference to Exhibit 3a. to
Form 10-K for 2006, File No. 1-15973).

Bylaws as amended May 24, 2007 (incorporated herein by reference to
Exhibit 3.1 to Form 8-K dated May 29, 2007, File No. 1-15973).

Copy of Mortgage and Deed of Trust, dated as of July 1, 1946, to Bankers
Trust and R. G. Page (to whom Stanley Burg is now successor), Trustees
(incorporated herein by reference to Exhibit 7(j) in File No. 2-6494); and
copies of Supplemental Indentures Nos. 1 through 14 to the Mortgage and
Deed of Trust, dated respectively, as of June 1, 1949, March 1, 1954, April
1, 1956, February 1, 1959, July 1, 1961, January 1, 1964, March 1, 1966,
December 1, 1969, April 1, 1971, January 1, 1975, December 1, 1975, July
1, 1981, June 1, 1985 and November 1, 1985 (incorporated herein by
reference to Exhibit 4(d) in File No. 33-1929); Supplemental Indenture No.
15 to the Mortgage and Deed of Trust, dated as of July 1, 1986 (filed as
Exhibit 4(c) in File No. 33-24168); Supplemental Indentures Nos. 16, 17
and 18 to the Mortgage and Deed of Trust, dated, respectively, as of
November 1, 1988, October 1, 1989 and July 1, 1990 (incorporated herein
by reference to Exhibit 4(c) in File No. 33-40482); Supplemental Indenture
No. 19 to the Mortgage and Deed of Trust, dated as of June 1, 1991
(incorporated herein by reference to Exhibit 4(c) in File No. 33-64014); and
Supplemental Indenture No. 20 to the Mortgage and Deed of Trust, dated as
of June 1, 1993 (incorporated herein by reference to Exhibit 4(c) in File No.
33-53795).

Copy of Indenture, dated as of June 1, 1991, between the Company and
Bankers Trust Company, Trustee, relating to the Company’s Unsecured
Medium-Term Notes (incorporated herein by reference to Exhibit 4(e) in
File No. 33-64014).

Officers’ Certificate dated June 12, 1991 creating Series A of the
Company’s Unsecured Medium-Term Notes (incorporated herein by
reference to Exhibit 4e. to Form 10-K for 1993, File No. 0-994).

Officers’ Certificate dated June 18, 1993 creating Series B of the
Company’s Unsecured Medium-Term Notes (incorporated herein by
reference to Exhibit 4f. to Form 10-K for 1993, File No. 0-994).

138

Exhibit Number

Document

*4e.

*4f.

*4g.

*4h.

*4i.

*4j.

*4k.

*4l.

4m.

12

21

Officers’ Certificate dated January 17, 2003 relating to Series B of the
Company’s Unsecured Medium-Term Notes and supplementing the
Officers’ Certificate dated June 18, 1993 (incorporated herein by reference
to Exhibit 4f.(1) to Form 10-K for 2002, File No. 0-994).

Form of Credit Agreement between Northwest Natural Gas Company and
the banks that are party thereto, with JPMorgan Chase Bank, N.A., as
administrative agent and Bank of America, N.A., as syndication agent, dated
as of May 31, 2007, including Form of Note (incorporated herein by
reference to Exhibit 4 to Form 10-Q dated November 5, 2010, File No.
1-15973).

Form of Letter Agreement, between each of JPMorgan Chase Bank, N.A.,
Bank of America, N.A., U.S. Bank National Association, UBS Loan
Finance LLC, Wells Fargo Bank, N.A., Merrill Lynch Bank USA, dated as
of April 29, 2008, extending the Credit Agreement between Northwest
Natural Gas Company and each financial institution with JPMorgan Chase
Bank, N.A., as Administrative Agent (incorporated herein by reference to
Exhibit 4i.(1) to Form 10-K for 2008, File No. 1-15973).

Form of Secured Medium-Term Notes, Series B (incorporated herein by
reference to Exhibit 4.1 to Form 8-K dated October 4, 2004, File No.
1-15973).

Letter Agreement among the Company, JPMorgan Chase Bank, N.A., Bank
of America, N.A., U.S. Bank National Association, Wachovia Bank,
National Association, Wells Fargo Bank, N.A., Bank of America, N.A.,
Successor by merger to Merrill Lynch Bank USA, and UBS Loan Finance
LLC, dated October 29, 2009 (incorporated herein by reference to Exhibit
4i. to Form 10-K for 2009, File No. 1-15973).

Distribution Agreement, dated March 18, 2009, among Banc of America
Securities LLC, UBS Securities LLC, J.P. Morgan Securities Inc., and Piper
Jaffray and Co. (Incorporated herein by reference to Exhibit 1.1 to
Form 8-K dated March 23, 2009, File No. 1-15973).

Form of Letter Agreement, dated August 24, 2009, among Banc of America
Securities, LLC, UBS Securities LLC, J.P. Morgan Securities Inc., Piper
Jaffray & Co. and Wells Fargo Securities, LLC (incorporated herein by
reference to Exhibit 4k. to Form 10-K for 2009, File No. 1-15973).

Form of Unsecured Medium-Term Notes, Series B (incorporated herein by
reference to Exhibit 4.2 to Form 8-K dated October 4, 2004,
File No. 1-15973).

Gill Ranch Note Purchase Agreement, dated November 30, 2011, among
Gill Ranch Storage, LLC and the parties listed thereto.

Statement re computation of ratios of earnings to fixed charges.

Subsidiaries of Northwest Natural Gas Company.

139

Exhibit Number

Document

23

31.1

31.2

32.1

Consent of PricewaterhouseCoopers LLP.

Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/
15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/
15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of Principal Executive Officer and Principal Financial Officer
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Executive Compensation Plans and Arrangements:

*10b.

*10c.

*10d.

*10e.

*10f.

*10g.

*10h.

*10i.

*10j.

10k.

*10l.

Executive Supplemental Retirement Income Plan 2010 Restatement
(incorporated herein by reference to Exhibit 10b. to Form 10-K for 2009, File
No. 1-15973).

Supplemental Executive Retirement Plan, effective September 1, 2004
restated 2011 (incorporated herein by reference to Exhibit 10.1 to Form 10-Q
for the quarter ended September 30, 2011, File No. 1-15973).

Northwest Natural Gas Company Supplemental Trust, effective January 1,
2005, restated as of December 15, 2005 (incorporated herein by reference to
Exhibit 10.7 to Form 8-K dated December 16, 2005, File No. 1-15973).

Northwest Natural Gas Company Umbrella Trust for Directors, effective
January 1, 1991, restated as of December 15, 2005 (incorporated herein by
reference to Exhibit 10.5 to Form 8-K dated December 16, 2005, File No.
1-15973).

Northwest Natural Gas Company Umbrella Trust for Executives, effective
January 1, 1988, restated as of December 15, 2005 (incorporated herein by
reference to Exhibit 10.6 to Form 8-K dated December 16, 2005, File No.
1-15973).

Restated Stock Option Plan, as amended effective December 14, 2006
(incorporated herein by reference to Exhibit 10c. to Form 10-K for 2006, File
No. 1-15973).

Form of Restated Stock Option Plan Agreement (incorporated herein by
reference to Exhibit 10h. to Form 10-K for 2009, File No. 1-15973).

Executive Deferred Compensation Plan, effective as of January 1, 1987,
restated as of February 26, 2009 (incorporated herein by reference to Exhibit
10(e). to Form 10-K for 2008, File No. 1-15973).

Directors Deferred Compensation Plan, effective June 1, 1981, restated as of
February 26, 2009 (incorporated herein by reference to Exhibit 10(f). to Form
10-K for 2008, File No. 1-15973).

Deferred Compensation Plan for Directors and Executives effective January
1, 2005, restated as of January 1, 2012.

Form of Indemnity Agreement as entered into between the Company and each
director and certain executive officers (incorporated herein by reference to
Exhibit 10l. to Form 10-K for 2009, File No. 1-15973).

140

Exhibit Number

*10l.(1)

*10m.

10n.

*10o.

*10p.

*10q.

*10r.

10s.

10t.

10u.

10v.

*10w.

*10x.

*10y.

*10z.

Document

Form of Indemnity Agreement as entered into between the Company and
certain executive officers (incorporated herein by reference to Exhibit
10l.(1) to Form 10-K for 2009, File No. 1-15973).

Non-Employee Directors Stock Compensation Plan, as amended effective
December 15, 2005 (incorporated herein by reference to Exhibit 10.2 to
Form 8-K dated December 16, 2005, File No. 1-15973).

Executive Annual Incentive Plan, effective February 23, 2012.

Form of Agreement to Recoupment Provisions of Executive Annual
Incentive Plan, effective as of January 1, 2010 (incorporated herein by
reference to Exhibit 10o. to Form 10-K for 2009, File No. 1-15973).

Form of Change in Control Severance Agreement between the Company
and each executive officer (incorporated herein by reference to Exhibit 10o.
to Form 10-K for 2008, File No. 1-15973).

Severance agreement dated December 19, 2008 between the Company and
Gregg S. Kantor (incorporated herein by reference to Exhibit 10.1 to Form
8-K dated December 23, 2008, File No. 1-15973).

Northwest Natural Gas Company Long-Term Incentive Plan, as amended
and restated effective December 15, 2011 (incorporated herein by reference
to Exhibit 10.2 to Form 8-K dated December 14, 2011, File No. 1-15973).

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan.

Form of Restricted Stock Bonus Agreement under the Long-Term Incentive
Plan (incorporated herein by reference to Exhibit 10.9 to Form 8-K dated
December 16, 2005, File No. 1-15973).

Form of Consent dated December 14, 2006 entered into by each executive
officer (incorporated herein by reference to Exhibit 10.1 to Form 8-K dated
December 19, 2006, File No. 1-15973).

Consent to Amendment of Deferred Compensation Plan for Directors and
Executives, dated February 28, 2008 entered into by each executive officer
(incorporated herein by reference to Exhibit 10bb to Form 10-K for 2007,
File No. 1-15973).

Form of Long-Term Incentive Award Agreement under the Long-Term
Incentive Plan relating to a special award to an executive officer
(incorporated herein by reference to Exhibit 10z. to Form 10-K for 2009,
File No. 1-15973).

141

Exhibit Number

Document

*10bb.

101.

Form of Restricted Stock Unit Award Agreement under the Long-Term
Incentive Plan (incorporated herein by reference to Exhibit 10.1 to
Form 8-K dated December 14, 2011, File No. 1-15973).

**The following materials from Northwest Natural Gas Company Annual
Report on Form 10-K for the fiscal year ended December 31, 2011,
formatted in Extensible Business Reporting Language (XBRL):

(i) Consolidated Statements of Income;
(ii) Consolidated Balance Sheets;
(iii) Consolidated Statements of Cash Flows; and
(iv) Related notes.

*
**

Incorporated herein by reference as indicated
In accordance with Rule 406T of Regulation S-T, the XBRL-related information in Exhibit 101 to this Annual Report on
Form 10-K is deemed not filed or part of a registration statement or prospectus for purposes of Section 11 or 12 of the
Securities Act, is deemed not filed for purposes of Section 18 of the Exchange Act and otherwise is not subject to
liability under these sections

142

NORTHWEST NATURAL GAS COMPANY
Ratio of Earnings to Fixed Charges
Thousands, except per share amount
(Unaudited)

EXHIBIT 12

Year Ended December 31,

2011

2010

2009

2008

2007

Fixed Charges, as defined:

Interest on Long-Term Debt . . . . . . . . . . . . . . . . .
Other Interest
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amortization of Debt Discount and Expense . . . .
Interest Portion of Rentals . . . . . . . . . . . . . . . . . .

$ 37,515
2,976
1,729
2,213

$ 39,198
1,587
1,766
2,130

$ 37,447
1,937
1,503
1,735

$ 33,605
4,022
700
1,551

$ 34,294
4,116
711
1,523

Total Fixed Charges, as defined . . . . . . . . . . . . . .

$ 44,433

$ 44,681

$ 42,622

$ 39,878

$ 40,644

Earnings, as defined:

Net Income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taxes on Income . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Charges, as above . . . . . . . . . . . . . . . . . . . .

$ 63,898
43,382
44,433

$ 72,667
49,462
44,681

$ 75,122
46,671
42,622

$ 69,525
40,678
39,878

$ 74,497
44,060
40,644

Total Earnings, as defined . . . . . . . . . . . . . . . . . .

$151,713

$166,810

$164,415

$150,081

$159,201

Ratio of Earnings to Fixed Charges . . . . . . . . . . . . . . .

3.41

3.73

3.86

3.76

3.92

Consent of Independent Registered Public Accounting Firm

EXHIBIT 23

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8
(Nos. 333-70218, 333-100885, 333-120955, 333-134973 and 333-139819) and in the Registration
Statement on Form S-3 (No. 333-171596) of Northwest Natural Gas Company of our report dated
February 28, 2012 relating to the consolidated financial statements, financial statement schedule and
the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Portland, Oregon
February 28, 2012

I, Gregg S. Kantor, certify that:

CERTIFICATION

EXHIBIT 31.1

I have reviewed this annual report on Form 10-K of Northwest Natural Gas Company;
1.
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;

4.

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;
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 28, 2012

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer

I, David H. Anderson, certify that:

CERTIFICATION

EXHIBIT 31.2

I have reviewed this annual report on Form 10-K of Northwest Natural Gas Company;
1.
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;

4.

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;
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 28, 2012

/s/ David H. Anderson
David H. Anderson
Senior Vice President and Chief Financial Officer

NORTHWEST NATURAL GAS COMPANY
Certificate Pursuant to Section 906
of Sarbanes – Oxley Act of 2002

EXHIBIT 32.1

Each of the undersigned, GREGG S. KANTOR, the President and Chief Executive Officer, and

DAVID H. ANDERSON, the Senior Vice President and Chief Financial Officer, of NORTHWEST
NATURAL GAS COMPANY (the Company), DOES HEREBY CERTIFY that:

1.

2.

The Company’s Annual Report on Form 10-K for the year ended December 31, 2011 (the Report)
fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of
1934, as amended; and

Information contained in the Report fairly presents, in all material respects, the financial condition
and results of operations of the Company.

IN WITNESS WHEREOF, each of the undersigned has caused this instrument to be executed

this 28th day of February 2012.

/s/ Gregg S. Kantor
Gregg S. Kantor
President and Chief Executive Officer

/s/ David H. Anderson
David H. Anderson
Senior Vice President and
Chief Financial Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002
has been provided to Northwest Natural Gas Company and will be retained by Northwest Natural Gas
Company and furnished to the Securities and Exchange Commission or its staff upon request.