Southwest Gas Holdings Inc
Annual Report 2018

Plain-text annual report

FUTURE FUTURE S S O O U U T T H H W W E E S S T T G G A A S S H H O O L L D D I I N N G G S S , , I I N N C C . . 2 2 0 0 1 1 8 8 A A N N N N U U A A L L R R E E P P O O R R T T FOCUSED FOCUSED WWW.SWGASHOLDINGS.COM WWW.SWGASHOLDINGS.COM 2 0 1 8 A N N U A L R E P O R T 2 0 1 8 A N N U A L R E P O R T We are looking ahead, anticipating how we can better serve our customers while positioning the Company for long-term success in the dynamic landscape of tomorrow. As we prepare for a sustainable future, we are optimistic about our ability to embrace the growth prospects and opportunities on the horizon. COMPANY PROFILE Southwest Gas Holdings, Inc. (“Company”), through its subsidiaries, engages in the business of purchasing, distributing and transporting natural gas, and providing comprehensive utility infrastructure services across North America. Southwest Gas Corporation (“Southwest”), a wholly owned subsidiary, safely and reliably delivers natural gas to over two million customers in Arizona, California and Nevada. Centuri Construction Group, Inc. (“Centuri”), a wholly owned subsidiary, is a comprehensive utility infrastructure services enterprise dedicated to delivering a diverse array of solutions to North America’s gas and electric providers. SOUTHWEST GAS HOLDINGS, INC. | 1 I T H G R B S I E R U T U F E H T SOUTHWEST GAS HOLDINGS, INC. | 3 DEAR SHAREHOLDERS We are pleased to share the 2018 Southwest Gas Holdings (“Company”) Annual Report, which highlights our accomplishments in delivering safe and reliable service to customers during a year of strong economic growth across our service territories. A p o s i t i v e e c o n o m i c o u t l o o k , especially in the Southwestern U.S., has created growth opportunities that are positioning the Company for a solid and sustainable future. Over the past year, we acted on these opportunities with an eye toward setting a path for long-term success.This future- focused approach led the Company to achieve another year of solid fi nancial performance and a number of notable accomplishments across our two primary business segments—natural gas operations and utility infrastructure services. JOHN P. HESTER P R E S I D E N T A N D C E O O u r n a t u r a l g a s s e g m e n t , S o u t h w e s t G a s (“Southwest”), achieved its highest customer satisfaction and trust numbers to date, while fulfi lling a commitment to community and environmental stewardship. Southwest also benefi ted this past year from a robust job market, which drew thousands of new residents to the major counties where we operate and created demand for more housing and new commercial centers. This spurred the addition of more than 32,000 new customers, and the chance to engage large-scale commercial projects. To accommodate system growth and integrity now and for the future, we continued pipe replacement activity with established cost recovery programs. We also received regulatory approval for an expansion project to serve new customers in Mesquite, Nevada, another example of our eff orts to achieve pre-authorization and cost recovery where possible for planned capital investments. As we keep an eye on what is ahead in the industry, we see opportunities for renewable natural gas (RNG) as a sustainable energy choice of the future. Southwest made inroads this past year to advance this gas technology as we pursued projects in partnership with developers, producers and customers interested in the benefi ts of this carbon-neutral natural gas option. Our utility infrastructure services business, Centuri, experienced another year of record revenues while pursuing smart growth opportunities, such as the recent acquisition of Linetec, which grew the Centuri footprint in the Southeastern U.S. by adding another tenured customer base to their now-expanded portfolio. Linetec signifi cantly increases the Company’s work in the electric space. Th is addition means strong, potential work opportunities on the horizon for 2019, including a combination of electric distribution and transmission, and telecom. Continued growth will also enhance Linetec’s scale in storm response services. Th e previous year’s acquisition of New England Utility Constructors exceeded expectations and drove much of Centuri’s revenue growth in 2018. Th ese results highlight the smart, stable growth strategy we expect to continue at Centuri in order to chart a strong future for this burgeoning business segment. Our commitment to safety and world-class customer service never changes, but our approach to providing the level of service that has become synonymous with the Company grows and changes every day. We are continuously enhancing our processes and developing new solutions that will make it easier for customers to engage with us. For example, Southwest recently rolled-out a mobile application, advanced customer notifi cations, call center enhancements to shorten call wait time and additional appointment windows. As a Company, we strive to exceed customers’ expectations. We take our social responsibility seriously and strive to make a positive impact on our community at large. Southwest employees once again outdid themselves in charitable giving, donating more than $2 million from their paychecks to support community organizations. Similarly, Centuri employees enthusiastically supported community organizations by donating money and volunteering to help in various philanthropic causes. 2018 was a great year; and as we look ahead, we are well positioned to act on growth opportunities that will build a long-term and sustainable future. A BRIGHT FINANCIAL FUTURE This year’s strong financial results continued a trend of excellent performance. Backed by a corporate value of financial stewardship, the Company achieved consolidated net income of $182.3 million. Our core operations improved from the prior year, as Centuri posted an impressive $45 million in net income following the acquisition of New England Utility Constructors, Inc. in late 2017, surpassing our expectations. “Positive performance overall allowed the Board of Directors to approve a dividend increase again this year, as has been our legacy.” At the same time, the largest contributor to our bottom line, Southwest, delivered nearly $139 million by effectively managing its utility operations in light of inflationary pressures and supporting a growing customer base between rate cases. Th at same growth of over 32,000 customers positively contributed to the bottom line. We are pleased that our 2018 financial results compare favorably to 2017, after considering the impacts of tax reform and company-owned life insurance. Between our expansion into Mesquite, Nevada; 2019 rate case applications for our Arizona, California and Paiute jurisdictions; and our recent acquisition of Linetec, we are on the right trajectory. Positive performance overall allowed the Board of Directors to approve a dividend increase again this year, as has been our legacy. Our aim is to continue executing on strategies that focus on future performance and allow shareholders to share in our successes. COMPARISON OF 5-YEAR CUMULATIVE TOTAL RETURNS DIVIDENDS GREW AT A COMPOUND ANNUAL GROWTH RATE OF 8.4% SWX S&P 500 S&P Composite Utilities Index $2.18 $2.08 $1.98 $1.80 $1.62 $1.46 $180 $160 $140 $120 $100 $80 2013 2014 2015 2016 2017 2018 PERFORMANCE GRAPH The performance graph above compares the fi ve-year cumulative total shareholder return on Company common stock, assuming reinvestment of dividends, with the total returns on the Standard & Poor’s (S&P) 500 Stock Composite Index (“S&P 500”) and the S&P Composite Utilities Index. The total shareholder return (annualized) over the fi ve-year period for Southwest Gas Holdings, Inc. (SWX) was 9.31%, compared to the S&P Composite Utilities Index (S15UTIL) return of 10.90%, and the S&P 500 Index (SPX) return of 8.48%. 2014 2015 2016 2017 2018 2019 SOUTHWEST GAS HOLDINGS, INC. | 5 FOCUSED ON VALUE NET INCOME BY SEGMENT NATURAL GAS OPERATIONS 76% UTILITY INFRASTRUCTURE SERVICES 24% NET INCOME $182M NATURAL GAS OPERATIONS MARGIN BY CUSTOMER CLASS RESIDENTIAL 70% SMALL COMMERCIAL 15% TRANSPORTATION 12% LARGE COMMERCIAL 2% INDUSTRIAL/OTHER 1% STOCK PRICES AND TRADING VOLUME HIGH LOW VOLUME (in hundreds) NYSE: SWX 2014 $64.20 $47.21 487,354 2015 $63.68 $50.78 500,363 2016 $79.58 $53.51 695,062 2017 $86.87 $72.32 652,248 2018 $85.97 $62.54 602,220 CENTURI REVENUES (IN MILLIONS) $1,522 $1,246 $1,139 $1,009 $740 2014 2015 2016 2017 2018 SOUTHWEST GAS HOLDINGS, INC. | 7 CUSTOMER FOCUSED SOUTHWEST GAS HOLDINGS, INC. | 9 “Our goal is to ensure positive experiences at every customer touchpoint.” Exceeding Customer Expectations Earning and maintaining our customers’ trust is key to sustaining a strong future. At Southwest and Centuri, our goal is to ensure positive experiences at every customer touchpoint. This past year, Southwest rolled out new digital tools to better allow us to deliver personalized, high-value service to our customers. These tools were developed to give utility customers more control over their accounts and choices when interacting with Southwest. Customers are responding positively to this intuitive, multi- channel approach to customer service and awarded Southwest our highest-ever customer satisfaction level of 95 percent. In a Cogent Reports® study conducted independently by Market Strategies International, Southwest earned some of the highest scores amongst utilities in the nation. As a result of these high scores, we were named a 2018 Most Trusted Utility as well as a 2018 Utility Customer Champion. We are proud of this recognition and will continue to work tirelessly to make each customer interaction better than the last. SOUTHWEST GAS HOLDINGS, INC. | 1 1 95% CUSTOMER SATISFACTION H T W O R G N O D E S U C O F SOUTHWEST GAS HOLDINGS, INC. | 1 3 POSITIONED FOR THE FUTURE Growth Opportunities Southwest’s primary service territories in Arizona and Nevada continue to rank among the fastest growing locales in the country. In May, the U.S. Census Bureau ranked Phoenix, Arizona, and Henderson, Nevada, #2 and #15, respectively, for highest population growth in a single year. Spurred by industry startups and business expansion, an abundance of jobs is drawing new residents to our service territories by the thousands. As a result, Southwest added over 32,000 natural gas customers in 2018. By proactively tracking economic activity in key corridors, we were able to engage with customers in new and exciting large-scale economic expansion opportunities in Nevada and Arizona. CUSTOMER GROWTH (IN THOUSANDS) PROJECTED POPULATION CUMULATIVE % CHANGE 2019-2024 31 32 26 26 28 2014 2015 2016 2017 2018 CALIFORNIA 3.94 NEVADA 6.87 ARIZONA 5.93 UNITED STATES 3.56 Source: S&P Global Market Intelligence SINGLE-FAMILY MARKET PERMITS SOLD CLOSINGS 0 0 4 6 2 , 0 0 3 2 2 , 0 0 5 4 2 , 0 0 4 0 2 , 0 0 1 , 2 2 0 0 2 0 2 , 0 0 9 , 1 2 0 0 7 8 1 , 0 0 1 , 1 1 0 0 7 0 1 , 0 0 5 0 1 , 0 0 7 9 , 0 0 1 , 1 1 0 0 2 0 1 , 0 0 8 , 1 1 0 0 8 0 1 , 0 0 5 3 , 0 0 8 2 , 0 0 6 3 , 0 0 9 2 , 0 0 9 3 , 0 0 1 , 3 0 0 1 , 4 0 0 3 3 , 2018 2019* 2020* 2021* 2018 2019* 2020* 2021* 2018 2019* 2020* 2021* CENTRAL ARIZONA SOUTHERN ARIZONA SOUTHERN NEVADA *PROJECTED SOURCE: Arizona data from RL Brown Housing Reports. Nevada data from Las Vegas Housing Market Letter. INVESTING Now serving more than two million customers across these fast-growing areas, we are compelled to not only keep up with customer demand, but to anticipate future customer needs and act on the opportunities growth presents for our natural gas operations. Southwest invested $683 million in our gas infrastructure in 2018, beginning an expected three-year capital investment of $2 billion through 2020. Southwest continues to work collaboratively with regulators to utilize constructive recovery mechanisms that mitigate regulatory lag. SOUTHWEST GAS HOLDINGS, INC. | 1 5 SOUTHWEST GAS HOLDINGS, INC. | 15 IN THE FUTURE N O D E S U C O F N O I T A R O B A L L O C ““ SOUTHWEST GAS HOLDINGS, INC. | 1 7 COLLABORATING WITH REGULATORS Th e ability to align all stakeholders’ needs in providing safe and reliable service comes through successful collaboration with our regulators. We prioritize open lines of communication and partnerships to achieve thoughtfully-planned goals that keep our system safe, maintain aff ordable rates for customers and return value to our shareholders. In Nevada, we recently received approval to increase revenues by $7.1 million and an increase to operating income of $7.9 million, following a slight reduction to depreciation expense. Th ese new rates became eff ective in 2019. We are targeting rate case fi lings for our Arizona and California rate jurisductions in May 2019 and September 2019, respectively. We will also be fi ling a Paiute rate case with the Federal Energy Regulatory Commission in May 2019. IN ARIZONA IN NEVADA IN CALIFORNIA During 2018, Southwest invested $129 million in the replacement of both Customer-Owned Yard Lines (COYL) and Vintage Steel Pipe (VSP). Since the inception of both programs, Southwest has invested nearly $210 million replacing COYL and VSP. The Public Utilities Commission authorized $123 million in pipe replacement work during 2017 and 2018, and has given approval for $35.3 million in 2019. We have been authorized to invest over $216 million through our gas infrastructure recovery mechanism since 2014. Under the Commission’s Mobile Home Park Utility Upgrade Pilot Program, we have upgraded 8 parks to direct service by Southwest. In 2017, the Commission authorized an extension of the program through 2019, with 15 additional mobile home parks anticipated for conversion. We also worked with state and federal regulators this past year to address the impacts of federal tax reform passed in late 2017. We worked collaboratively with each of our regulators to develop plans on how to ensure our customers will receive the benefi ts from tax reform in a fair, balanced and timely manner. FOCUSED ON SAFETY & RELIABILITY SOUTHWEST GAS HOLDINGS, INC. | 1 9 As we plan for growth in our service territories, we hold ourselves to a level of operational excellence that continually asks—how can we do it better? This drive for continuous improvement impacts everything from safety to customer engagement to operational effi ciency and best practices. Improving Safety Our Company takes proactive efforts, both internally and externally, in ensuring safety is a high priority. Centuri has implemented successful safety initiatives and proven training methods, and has provided accountability to our customers and the communities where we work. At Southwest, our commitment has led to signifi cant improvement in our emergency response times, arriving within 30 minutes of a reported incident 70.1% of the time. EXCELLENCE IN EMERGENCY RESPONSE (ARRIVAL ON SCENE WITHIN 30 MINUTES) 68.6% 68.6% 70.1% 67.4% 2015 2016 2017 2018 VISION AND GROWTH FOR ALL SOUTHWEST GAS HOLDINGS, INC. | 2 1 Y T I L I B I S N O P S E R E T A R O P R O C SOUTHWEST GAS HOLDINGS, INC. | 23 Improving our Communities Southwest’s deep roots in the communities we serve are part of our enduring legacy of valuing stewardship and giving back. This is on full display through the generosity and spirit of giving that thrives in our employees. In 2018, Southwesters crossed the $2 million mark in annual contributions to local charitable organizations. They also gave thousands of hours of time to hands-on community volunteer projects and events. We strive to promote a positive and friendly workplace and embrace a culture of diversity and inclusivity. These efforts earned a “Zippia Best Companies to Work for in Las Vegas” recognition in 2018. Centuri is also growing in best practices and community profile. Over the last several years, Centuri significantly increased its spending with diverse suppliers from 2.5 percent in 2014 to 23 percent in 2017. EMPLOYEE GIVING (IN MILLIONS) $2.13 $1.90 $1.69 81% EMPLOYEE PARTICIPATION $1.47 $1.31 $1,153 AVERAGE EMPLOYEE DONATION 2014 2015 2016 2017 2018 Sustainability Stewarding our natural resources and identifying ways to reduce carbon emissions—both in our operations and for our customers—is an important part of charting a sustainable future. Through our energy efficiency programs, we have enabled customers to achieve significant savings that impact their pocketbook and their carbon footprint. ENERGY EFFICIENCY SAVINGS FOR OUR CUSTOMERS $71* ENERGY EFFICIENCY SAVINGS FOR OUR CUSTOMERS $1,980 AVERAGE LIFETIME SAVINGS / PARTICIPATING CUSTOMER *Based on Southwest February 2019 gas cost rates. Expected average annual and lifetime natural gas savings for customers participating in Southwest’s Arizona, California and Nevada residential and commercial energy efficiency programs during 2018. Internally, the Company is looking at ways to enhance our operations for long-term sustainability. By 2025, Southwest seeks to achieve a 20 percent reduction in greenhouse gas (GHG) emissions from fleet and facilities using 2015 emissions as a baseline. We are taking proactive steps by making improvements to building facilities and converting portions of Southwest’s fleet to compressed natural gas (CNG). Centuri is committed to protecting the environment and has made significant improvements in implementing environmental risk mitigation plans to the construction process on both engineering and administrative controls. These steps include the availability of on-site spill kits and monthly inspections of fire equipment. In 2018, Southwest helped customers displace 11 million gallons of diesel fuel by delivering cleaner-burning CNG for their vehicle fleets. DIESEL FUEL DISPLACED 11 MILLION GALLONS 5,500 VEHICLES SOUTHWEST GAS HOLDINGS, INC. | 25 Corporate Governance We support our core values and track record of excellence with a long-term focus, corporate governance practices aligned with shareholder interests, a pay-for-performance culture and an active program of shareholder engagement. Committed to building long-term shareholder value, we strive to operate sustainably with accountability, transparency and integrity. Long-term focus on building shareholder value, with a pay-for- performance compensation program structured to mitigate excessive short-term risk-taking. Corporate governance practices that align with shareholder interests and support our core values, including robust stock ownership guidelines, annual election of all directors and the ability for shareholders to call special meetings and act by written consent. Our Board of Directors is made up of our CEO and 11 independent directors who bring deep and diverse management, financial and operational experience; significant expertise in the industries that matter most to our business; and important ties to our key service territories. Sustainable and responsible business practices that protect the environment, preserve natural resources and support our local communities. We value input from shareholders and maintain a robust program of shareholder engagement on a range of topics, including our financial performance and matters of corporate governance. The past year marked an exciting new effort to make renewable natural gas (RNG) a reality for customers interested in the environmental benefits of this carbon-neutral fuel source. RNG is biogas, which comes from facilities like landfills, dairies or wastewater treatment plants that is cleaned and upgraded to meet pipeline quality standards. It is a carbon-neutral natural gas that can be injected into Southwest’s pipeline system and delivered to customers for use in various applications, such as fueling vehicle fleets or generating on-site power. As part of a commitment to sustainable energy development, we are working with various producers and developers, as well as customers who are interested in achieving greater environmental benefits through RNG. We are also partnering with regulators to establish a framework for RNG energy credits, which will further advance RNG energy development. RENEWABLE NATURAL GAS CUSTOMER USE CLEAN UP ➠ FARMS / LANDFILLS WATER TREATMENT / SEWAGE CO2 & METHANE COLLECTED CO2 & methane collected Position ed as one of North America’s largest full-service underground pipeline contractors operating in 28 markets across the U.S. and Canada, the Company’s utility infrastructure services business, Centuri, continues to grow in scope and profi tability. In 2018, Centuri acquired Linetec Services, LLC, a premier provider of recurring maintenance, refurbishment, upgrade and installation services for electrical transmission and distribution infrastructure throughout the Gulf Coast and Mid-Atlantic regions. Th e transaction will broaden Centuri’s capabilities in the electric services infrastructure space and extend its geographic footprint into the Southeast. As a result, Centuri will enhance its service offerings for existing customers while serving additional customers in new markets with an increased array of capabilities. Th is acquisition supports Centuri’s growth plans and enables our fast-growing utility infrastructure services business to stay ahead of client needs and industry trends. Similar to the previous year’s acquisition of Neuco, which exceeded expectations, we are enthusiastic about Linetec’s prospect for contributing to earnings within the fi rst year. Centuri continues to operate with a strategic vision focused on growth, profi tability and diversifi cation of services and customers, both organically and through acquisitions. Th e nature of the company’s core work lends itself to long-term industry and customer commitments, contributing to a more stable and tenured customer base. Specialty contracting primarily for investor-owned utilities and municipalities has proven to be a more resilient niche since industry customers are more likely to have long-term, funded projects that are less susceptible to economic or cyclical changes. “Centuri continues to operate with a strategic vision focused on growth, profi tability and diversifi cation of services and customers, both organically and through acquisitions.” OPERATING IN 28 MAJOR MARKETS SOUTHWEST GAS HOLDINGS, INC. | 27 UTILITY INFRASTRUCTURE SERVICES THE FUTURE SOUTHWEST GAS HOLDINGS, INC. | 29 IS BRIGHT Reflecting on the accomplishments of the past year inevitably casts our sights on the future—and the future is where our focus remains. Like all industries, we operate in a world of changing customer needs and expectations, along with evolving opportunities to grow and strengthen our business. As we execute on deliberate strategies, our direction is forward. We are looking ahead, anticipating how we can better serve our customers, while positioning the Company for long-term success in the dynamic landscape of tomorrow. As we prepare for a sustainable future, we are optimistic about our ability to embrace growth prospects and opportunities on the horizon. FINANCIALS SOUTHWEST GAS HOLDINGS, INC. | 31 Consolidated Selected Financial Data Year Ended December 31, (Thousands of dollars, except per share amounts) Operating revenues Operating expenses (1) 2018 2017 2016 2015 2014 $2,880,013 2,522,580 $2,548,792 2,205,668 $2,460,490 2,145,016 $2,463,625 2,151,926 $2,121,707 1,821,805 Operating income (1) $ 357,433 $ 343,124 $ 315,474 $ 311,699 $ 299,902 Net income attributable to Southwest Gas Holdings, Inc. Total assets at year end Capitalization at year end Total equity Redeemable noncontrolling interest Long-term debt, excluding current maturities Current maturities of long-term debt Common stock data Common equity percentage of capitalization Return on average common equity Basic earnings per share Diluted earnings per share Dividends declared per share Payout ratio Book value per share at year end Market value per share at year end Market value to book value per share Common shares outstanding at year end (000) Number of common shareholders at year end $ 182,277 $ 193,841 $ 152,041 $ 138,317 $ 141,126 $7,357,729 $6,237,066 $5,581,126 $5,358,685 $5,208,297 $2,251,590 81,831 2,107,258 $1,812,403 — 1,798,576 $1,661,273 22,590 1,549,983 $1,592,325 16,108 1,551,204 $1,486,266 20,042 1,631,374 $4,440,679 $3,610,979 $3,233,846 $3,159,637 $3,137,682 $ 33,060 $ 25,346 $ 50,101 $ 19,475 $ 19,192 50.7% 9.3% 3.69 3.68 2.08 56% 42.63 76.50 $ $ $ $ $ 50.2% 11.2% 4.04 4.04 1.98 49% 37.74 80.48 $ $ $ $ $ 51.4% 9.3% 3.20 3.18 1.80 56% 35.03 76.62 $ $ $ $ $ 50.4% 8.9% 2.94 2.92 1.62 55% 33.65 55.16 $ $ $ $ $ 47.4% 9.7% 3.04 3.01 1.46 48% 32.03 61.81 180% 213% 219% 164% 193% $ $ $ $ $ 46,523 14,749 (1) Periods prior to 2018 depict revised Operating expenses and Operating income for the reclassification of non-service cost components of net 53,026 12,541 48,090 13,077 47,378 14,153 47,482 13,619 periodic benefit costs in both the Company’s and Southwest’s Consolidated Statements of Income in the Annual Report to Shareholders due to the adoption of ASU 2017-07. Net income was not impacted. Refer to Note 11 – Pension and Other Postretirement Benefits in the notes to the Consolidated Financial Statements in this Annual Report to Shareholders for further information relating to the adoption of this update. 32 | SOUTHWEST GAS HOLDINGS, INC. Natural Gas Operations Year Ended December 31, (Thousands of dollars) Operating revenue Net cost of gas sold Operating margin Expenses Operations and maintenance (1) Depreciation and amortization Taxes other than income taxes 2018 2017 2016 2015 2014 $1,357,728 419,388 $1,302,308 355,045 $1,321,412 397,121 $1,454,639 563,809 $1,382,087 505,356 938,340 947,263 924,291 890,830 876,731 404,813 191,816 59,898 391,321 201,922 57,946 381,964 233,463 52,376 369,832 213,455 49,393 368,313 204,144 47,252 Operating income (1) $ 281,813 $ 296,074 $ 256,488 $ 258,150 $ 257,022 Contribution to consolidated net income $ 138,842 $ 156,818 $ 119,423 $ 111,625 $ 116,872 Total assets at year end Net gas plant at year end $6,141,584 $5,482,669 $5,001,756 $4,822,845 $4,652,307 $5,093,238 $4,523,650 $4,131,971 $3,891,085 $3,658,383 Construction expenditures and property additions $ 682,869 $ 560,448 $ 457,120 $ 438,289 $ 350,025 Cash flow, net From operating activities From (used in) investing activities From (used in) financing activities $ 382,502 (669,392) 280,906 $ 309,216 (557,384) 267,090 $ 507,224 (446,238) (63,339) $ 497,500 (416,727) (74,159) $ 288,534 (328,645) 23,413 Net change in cash $ (5,984) $ 18,922 $ (2,353) $ 6,614 $ (16,698) Total throughput (thousands of therms) Residential Small commercial Large commercial Industrial/Other Transportation Total throughput 697,011 305,342 92,548 37,753 1,050,551 674,271 297,677 92,561 33,816 974,407 684,626 294,525 90,949 30,275 970,561 655,421 285,118 92,284 30,973 1,035,707 617,377 276,582 94,391 32,374 906,691 2,183,205 2,072,732 2,070,936 2,099,503 1,927,415 $ 0.55 Weighted average cost of gas purchased ($/therm) 1,930,000 Customers at year end 2,196 Employees at year end 879 Customer to employee ratio 1,416 Degree days – actual 1,816 Degree days – ten-year average (1) Periods prior to 2018 depict revised Operations and maintenance expense and Operating income for the reclassification of non-service cost $ 0.44 1,956,000 2,219 881 1,512 1,792 $ 0.31 2,047,000 2,312 886 1,531 1,694 $ 0.44 2,015,000 2,285 882 1,478 1,733 $ 0.37 1,984,000 2,247 883 1,613 1,771 components of net periodic benefit costs in both the Company’s and Southwest’s Consolidated Statements of Income in the Annual Report to Shareholders due to the adoption of ASU 2017-07. Net income was not impacted. Refer to Note 11 – Pension and Other Postretirement Benefits in the notes to the Consolidated Financial Statements in this Annual Report to Shareholders for further information relating to the adoption of this update. SOUTHWEST GAS HOLDINGS, INC. | 33 Management’s Discussion and Analysis of Financial Condition and Results of Operations About Southwest Gas Holdings, Inc. Southwest Gas Holdings, Inc. is a holding company that owns all of the shares of common stock of Southwest Gas Corporation (“Southwest” or the “natural gas operations” segment), and all of the shares of common stock of Centuri Construction Group, Inc. (“Centuri” or the “utility infrastructure services” segment). Southwest Gas Holdings, Inc. and its subsidiaries are collectively referred to as the “Company.” Prior to August 2017, 96.6% of Centuri’s shares were owned by the Company. During August 2017, Southwest Gas Holdings, Inc. acquired the remaining 3.4% equity interest in Centuri that was held by the previous owners (which, prior to that date, was reflected as a redeemable noncontrolling interest). As part of a holding company reorganization, effective January 2017, designed to provide further separation between regulated and unregulated businesses, Centuri and Southwest became subsidiaries of the Company; whereas historically, Centuri had been a direct subsidiary of Southwest. To give effect to this change, the separate consolidated financial statements of Southwest Gas Corporation depict Centuri-related amounts for periods prior to 2017 as discontinued operations of Southwest. Refer to Note 1 – Background, Organization, and Summary of Significant Accounting Policies and Note 18 – Reorganization Impacts – Discontinued Operations Solely Related to Southwest Gas Corporation of this 2018 Annual Report for additional details regarding the reorganization and the presentation of financial information. As referred to above, the Company has two business segments (natural gas operations and utility infrastructure services), which are discussed in more detail below. Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Southwest is the largest distributor of natural gas in Arizona, selling and transporting natural gas in most of central and southern Arizona, including the Phoenix and Tucson metropolitan areas. Southwest is also the largest distributor of natural gas in Nevada, serving the majority of southern Nevada, including the Las Vegas metropolitan area, and portions of northern Nevada. In addition, Southwest distributes and transports natural gas for customers in portions of California, including the Lake Tahoe area and the high desert and mountain areas in San Bernardino County. As of December 31, 2018, Southwest had 2,047,000 residential, commercial, industrial, and other natural gas customers, of which 1,090,000 customers were located in Arizona, 761,000 in Nevada, and 196,000 in California. Residential and commercial customers represented over 99% of the total customer base. During 2018, 53% of operating margin (gas operating revenues less the net cost of gas sold) was earned in Arizona, 36% in Nevada, and 11% in California. During this same period, Southwest earned 85% of its operating margin from residential and small commercial customers, 3% from other sales customers, and 12% from transportation customers. These general patterns are expected to remain materially consistent for the foreseeable future. Southwest recognizes operating revenues from the distribution and transportation of natural gas (and related services) to customers. Operating margin is a financial measure defined by management as gas operating revenues less the net cost of gas sold. However, operating margin is not specifically defined in accounting principles generally accepted in the United States (“U.S. GAAP”). Thus, operating margin is considered a non-GAAP measure. Management uses this financial measure because natural gas operating revenues include the net cost of gas sold, which is a tracked cost that is passed through to customers without markup under purchased gas adjustment (“PGA”) mechanisms. Fluctuations in the net cost of gas sold impact revenues on a dollar-for-dollar basis, but do 34 | SOUTHWEST GAS HOLDINGS, INC. not impact operating margin or operating income. Therefore, management believes operating margin provides investors and other interested parties with useful and relevant information to analyze Southwest’s financial performance in a rate-regulated environment. The principal factors affecting changes in operating margin are general rate relief (including impacts of infrastructure trackers) and customer growth. Refer to the Summary Operating Results table for a reconciliation of revenues to operating margin. The demand for natural gas is seasonal, with greater demand in the colder winter months and decreased demand in the warmer summer months. All of Southwest’s service territories have decoupled rate structures (alternative revenue programs), which are designed to eliminate the direct link between volumetric sales and revenue, thereby mitigating the impacts of weather variability and conservation on operating margin, allowing Southwest to pursue energy efficiency initiatives. Centuri is a comprehensive utility infrastructure services enterprise dedicated to delivering a diverse array of solutions to North America’s gas and electric providers. Centuri derives revenue from installation, replacement, repair, and maintenance of energy distribution systems, and developing industrial construction solutions. Centuri operates in 26 major markets in the United States (“U.S.”), primarily as NPL, and in 2 major markets in Canada (as NPL Canada and W.S. Nicholls). In November 2017, Centuri expanded its operations in the Northeast region of the U.S. through the acquisition of New England Utility Constructors, Inc. (“Neuco”), and again in November 2018, in the Southeast region of the U.S. through the acquisition of an 80% interest in Linetec Services, LLC (“Linetec”). Both companies were privately owned utility infrastructure services businesses. Information surrounding these acquisitions can be found in Note 19 – Business Acquisitions in this annual report. Utility infrastructure services activity can be significantly impacted by changes in weather, general and local economic conditions (including the housing market), interest rates, employment levels, job growth, infrastructure replacement programs of utilities, and local and federal regulation (including tax rates and incentives). During the past few years, utilities have implemented or modified system integrity management programs to enhance safety pursuant to federal and state mandates. These programs, coupled with historic bonus depreciation tax deduction incentives, have resulted in a significant increase in multi-year utility system replacement programs throughout the U.S. Generally, Centuri revenues are lowest during the first quarter of the year due to less favorable winter weather working conditions. Revenues typically improve as more favorable weather conditions occur during the summer and fall months. In certain circumstances, such as with large bid contracts (especially those of a longer duration), or unit-price contracts with revenue caps, results may be impacted by differences between costs incurred and those anticipated when the work was originally bid. Work awarded, or failing to be awarded, by individual large customers can impact operating results. Executive Summary The items discussed in this Executive Summary are intended to provide an overview of the results of the Company’s operations and are covered in greater detail in later sections of management’s discussion and analysis. As reflected in the table below, the natural gas operations segment accounted for an average of 79% of consolidated net income over the past three years. Summary Operating Results Year ended December 31, (In thousands, except per share amounts) Contribution to net income: Natural gas operations Utility infrastructure services Corporate and administrative Net income Average number of common shares Consolidated basic earnings per share Natural Gas Operations Reconciliation of Revenue to Operating Margin (Non-GAAP measure) Gas operating revenues Less: Net cost of gas sold Operating margin SOUTHWEST GAS HOLDINGS, INC. | 35 2018 2017 2016 $ 138,842 44,977 (1,542) $ 156,818 38,360 (1,337) $ 119,423 32,618 — $ 182,277 $ 193,841 $ 152,041 49,419 47,965 47,469 $ 3.69 $ 4.04 $ 3.20 $1,357,728 419,388 $1,302,308 355,045 $1,321,412 397,121 $ 938,340 $ 947,263 $ 924,291 2018 Overview Consolidated results for 2018 decreased compared to 2017. Basic earnings per share were $3.69 in 2018 compared to $4.04 in 2017. Natural gas operations highlights include the following: • Added 32,000 net new customers (1.6% growth rate) in 2018 • Operating margin decreased $9 million between years, as $20 million of tax savings were returned to Arizona customers • Rate relief and customer growth, combined, provided $17 million in incremental margin in 2018 • Pension cost increased nearly $8 million between years • Company-Owned Life Insurance (“COLI”) cash surrender values declined $13.5 million between years • Issued $300 million in 3.70% senior notes in March 2018 Utility infrastructure services highlights include the following: • Record revenues of $1.5 billion were experienced in 2018, an increase of $276 million, or 22%, compared to 2017 • Utility infrastructure services expenses increased $239 million, or 21%, compared to 2017 • 2018 results include a full year of Neuco, which was acquired in November 2017 • Completed the acquisition of Linetec Services, LLC in November 2018 Southwest Gas Holdings highlights include the following: • Issued 3,565,000 shares of common stock in an underwritten public offering in November 2018 • Jane Lewis-Raymond and Leslie T. Thornton joined the Board of Directors in January 2019 36 | SOUTHWEST GAS HOLDINGS, INC. Results of Natural Gas Operations Year Ended December 31, (Thousands of dollars) Gas operating revenues Net cost of gas sold Operating margin Operations and maintenance expense Depreciation and amortization Taxes other than income taxes Operating income Other income (deductions) Net interest deductions Income before income taxes Income tax expense 2018 2017 2016 $1,357,728 419,388 $1,302,308 355,045 $1,321,412 397,121 938,340 404,813 191,816 59,898 281,813 (17,240) 81,740 182,833 43,991 947,263 391,321 201,922 57,946 296,074 (6,388) 69,733 219,953 63,135 924,291 381,964 233,463 52,376 256,488 (11,484) 66,997 178,007 58,584 Contribution to consolidated net income $ 138,842 $ 156,818 $ 119,423 2018vs.2017 Contribution to consolidated net income from natural gas operations decreased $18 million between 2018 and 2017. The decrease was primarily due to higher Operations and maintenance expense and Net interest deductions and higher Other deductions, partially offset by rate relief and lower Depreciation and amortization. The amounts above for Operations and maintenance expense and Other income (deductions) for the 2017 and 2016 periods reflect reclassifications of $19.4 million and $19.8 million, respectively, related to the non-service cost components of employee pensions and other post-retirement benefits, as a result of the adoption of the update to the Financial Accounting Standards Board (the “FASB”) Topic 715 (see Note 11 – Pension and Other Postretirement Benefits). The reclassification is intended to make the prior period comparable to the current period, but did not impact net income overall. Operating margin decreased $9 million between years due to a $20 million decrease in customer rates to reflect the reduced cost of service during 2018 from U.S. tax reform. The decline in applicable U.S. income tax rates also significantly reduced income tax expense. Operating margin was favorably impacted by rate relief in the Arizona and California jurisdictions, which collectively provided $6 million in operating margin (see Rates and Regulatory Proceedings). Customer growth contributed $11 million in operating margin. The remaining decline of $6 million relates to the combined impacts of reduced surcharge recoveries including Nevada Conservation and Energy Efficiency (“CEE”) programs and a California Climate Credit returned to customers (offset in Depreciation and amortization below), as well as variability in other miscellaneous revenues, margin from gas infrastructure replacement programs and from customers outside the decoupling mechanisms. Operations and maintenance expense increased $13.5 million, or 3%, between 2018 and 2017 primarily due to the impacts of an $8 million increase in pension cost and to other employee benefit costs. In addition, expenditures for pipeline integrity management and damage prevention programs were $3.5 million higher in 2018. Residual differences primarily relate to higher information technology related costs offset by lower claims experience for injuries and damages under insurance programs. SOUTHWEST GAS HOLDINGS, INC. | 37 Depreciation and amortization expense decreased $10.1 million, or 5%, primarily due to reduced depreciation rates in Arizona, a result of the April 2017 Arizona general rate case decision, and the impacts of surcharge recoveries for regulatory mechanisms, as discussed above. Partially offsetting the decline was increased depreciation expense associated with a $466 million, or 7%, increase in average gas plant in service for the current year as compared to the prior year. The increase in gas plant was attributable to pipeline capacity reinforcement work, franchise requirements, scheduled and accelerated pipe replacement activities, and new infrastructure. Taxes other than income taxes increased $2 million, or 3%, between 2018 and 2017 primarily due to higher property taxes associated with plant additions. Other income (deductions) declined $10.9 million between 2018 and 2017. The current year reflects a $3.2 million decrease in COLI policy cash surrender values net of recognized death benefits, while 2017 reflected $10.3 million of COLI-related income. The cash surrender values of these policies fluctuate based on the value of the underlying investments. Partially offsetting the decrease between periods was an increase in interest income of $3.2 million, including amounts related to the Gas Infrastructure Replacement (“GIR”) mechanism in Nevada (See the Rates and Regulatory Proceedings section for more information about the GIR mechanism). Additionally, this category in both periods reflects the non-service-related components of employee pension and post-retirement benefit cost, resulting from the update to FASB Topic 715 noted above. Net interest deductions increased $12 million between 2018 and 2017, primarily due to higher interest associated with credit facility borrowings and the issuance of $300 million of senior notes in March 2018. Income tax fluctuations between 2018 and 2017 resulted primarily from the December 2017 enactment of U.S. tax reform, which among other things reduced the corporate federal income tax rate from 35% to 21%, in addition to the impact of fluctuations in pre-tax earnings between periods, as discussed above. Refer to Note 13 – Income Taxes in the notes to the consolidated financial statements. 2017vs.2016 The contribution to consolidated net income from natural gas operations increased $37.4 million between 2017 and 2016. The improvement was primarily due to an increase in operating margin, lower depreciation expense, and higher other income, partially offset by an increase in general taxes and operations and maintenance expenses. The amounts presented in Operations and maintenance expense and Other income (deductions) for the 2017 and 2016 periods reflect reclassifications of $19.4 million and $19.8 million, respectively, related to the non-service cost components of employee pensions and other post-retirement benefits, as a result of the adoption of the update to FASB Topic 715. Operating margin increased $23 million between years. Combined rate relief in the Arizona and California jurisdictions provided $15 million in operating margin in 2017. Customer growth contributed $9 million in operating margin during the same period, while operating margin associated with recoveries of regulatory assets, infrastructure replacement mechanisms, customers outside the decoupling mechanisms, and other miscellaneous revenues decreased $1 million. Operations and maintenance expense increased $9 million, or 2%, between 2017 and 2016 as general cost increases were partially offset by a decline in self-insured employee medical costs. Higher expenses for pipeline integrity management and damage prevention programs accounted for $2.5 million of the increase. Both periods reflect the reclassification of non-service components of pension and other post-retirement benefit cost, as discussed above. 38 | SOUTHWEST GAS HOLDINGS, INC. Depreciation and amortization expense decreased $31.5 million, or 14%, between comparative periods, primarily due to reduced depreciation rates in Arizona, resulting from the 2017 Arizona general rate case decision. Partially offsetting the decline was increased depreciation expense associated with a $338 million, or 6%, increase in average gas plant in service in 2017 as compared to 2016. The increase in gas plant was attributable to pipeline capacity reinforcement work, franchise requirements, scheduled and accelerated pipe replacement activities, and new infrastructure. Taxes other than income taxes increased $5.6 million, or 11%, between 2017 and 2016 primarily due to higher property taxes associated with net plant additions and increased property taxes in Arizona, including the impact of a property tax regulatory tracking mechanism. Other income (deductions) improved $5.1 million between 2017 and 2016. The 2017 period reflects a $10.3 million increase in COLI policy cash surrender values, while 2016 reflected $7.4 million of combined COLI-related income and recognized death benefits. COLI amounts were greater than expected in both years. In addition, interest earned related to the GIR mechanism in Nevada was greater in 2017 due to a substantial increase in the amount of accelerated pipe replacement work under the program during 2017. Both periods reflect the reclassification of non-service pension cost in accordance with the update to FASB Topic 715 noted above. Net interest deductions increased $2.7 million between 2017 and 2016, primarily due to the issuance of $300 million of senior notes in September 2016 and higher interest associated with credit facility borrowings during 2017. The increase was substantially offset by reductions in interest expense associated with PGA balances as compared to the prior year and various debt redemptions in the second half of 2016 and early 2017. Income taxes were favorably impacted in 2017 by approximately $8 million due to the December 2017 enactment of U.S. tax reform. This reduction primarily related to the remeasurement of deferred tax liabilities not associated with utility plant depreciation timing differences. Results of Utility Infrastructure Services Year Ended December 31, (Thousands of dollars) Utility infrastructure services revenues Operating expenses: Utility infrastructure services expenses Depreciation and amortization Operating income Other income (deductions) Net interest deductions Income before income taxes Income tax expense Net income Net income (loss) attributable to noncontrolling interests SOUTHWEST GAS HOLDINGS, INC. | 39 2018 2017 2016 $1,522,285 $1,246,484 $1,139,078 1,387,689 57,396 1,148,963 49,029 1,024,423 55,669 77,200 (238) 14,190 62,772 18,420 44,352 (625) 48,492 345 7,986 40,851 2,390 38,461 101 58,986 1,193 6,663 53,516 19,884 33,632 1,014 Contribution to consolidated net income attributable to Centuri $ 44,977 $ 38,360 $ 32,618 In November 2018, Centuri acquired Linetec. Results for Linetec subsequent to the date of the acquisition have been included in the table above including $14.1 million of revenues. In November 2017, Centuri acquired Neuco. Line items in the table above reflect the results of Neuco subsequent to the acquisition date, including $147.9 million and $17.2 million in revenues during 2018 and 2017, respectively. 2018vs.2017 Contribution to consolidated net income from utility infrastructure services increased $6.6 million in 2018 compared to 2017. Results were positively impacted by a full year of activities from Neuco, which exceeded expectations, improved productivity on certain contracts compared to 2017, and from incremental non-routine projects with customers. These increases were partially offset by higher interest charges and increased amortization due to the Neuco and Linetec acquisitions. Additionally, net income in both years reflected benefits from U.S. tax reform; 2018 reflects lower tax rates on a higher level of pre-tax earnings and 2017 reflects the remeasurement of Centuri’s deferred tax liabilities following the enactment date. Utility infrastructure services revenue increased $275.8 million, or 22%, between 2018 and 2017, attributable primarily to a full year of Neuco operations ($147.9 million in 2018 compared to $17.2 million in 2017) and revenues from Linetec ($14.1 million) in December 2018 following the acquisition date, and to continued growth with existing customers under existing master service and bid agreements. In addition, revenue was favorably impacted from certain non-routine projects (including customer-requested support during strike-related and emergency response situations), and from the settlement in 2018 of a previous contract dispute on a water pipe replacement project, discussed below. Revenues in 2017 were negatively impacted by a temporary work stoppage with a customer (also discussed below), which began in the first quarter of 2017, with work resuming during the second quarter of the same year. Utility infrastructure services revenue includes contracts with Southwest totaling $135.9 million in 2018 and $97 million in 2017. Centuri accounts for services provided to Southwest at contractual prices. Refer to Consolidation in Note 1 – Background, Organization, and Summary of Significant Accounting Policies to the consolidated financial statements. During the past several years, utility infrastructure services segment efforts have been focused on obtaining utility system replacement work under both blanket contracts and incremental bid projects. For both 2018 and 2017, revenues from replacement work were approximately 60% of total revenues. Governmental safety-related programs and U.S. tax incentives have resulted in many utilities undertaking multi-year infrastructure system replacement projects in recent years. 40 | SOUTHWEST GAS HOLDINGS, INC. Utility infrastructure services expenses increased $238.7 million, or 21%, between 2018 and 2017 largely due to additional gas pipe replacement work and higher labor-related operating expenses to support business growth. Costs incurred overall during 2018 reflect changes that were implemented to align with the increased size and complexity of the business, while expenses in 2017 were negatively impacted by the water pipe replacement project noted above. Included in total Utility infrastructure services expense are general and administrative (“G&A”) costs, which increased $23.8 million in 2018 when compared to 2017, including $6.9 million (2018) and $2.6 million (2017) of deal costs from the acquisitions of Linetec and Neuco, respectively. Excluding deal costs, but including all other G&A components, there were a total of $133 million of expenses during 2018 related to Neuco ($120.3 million) and Linetec ($12.7 million), as compared to $14.4 million in 2017 from Neuco activity following the acquisition date. Gains on sale of equipment (reflected as an offset to Utility infrastructure services expenses) were approximately $1.7 million and $4.2 million for 2018 and 2017, respectively. Depreciation and amortization expense increased $8.4 million between 2018 and 2017 primarily due to $3.5 million of incremental amortization of finite-lived intangible assets related to the Neuco and Linetec acquisitions. Additional equipment purchased to support the growing volume of work being performed resulted in higher depreciation expense, partially offset by a $6.9 million reduction in depreciation with the extension of the estimated useful lives of certain depreciable equipment. The increase in net interest deductions was due primarily to interest expense and amortization of debt issuance costs associated with incremental borrowings under the $590 million secured revolving credit and term loan facility (primarily related to the Neuco and Linetec acquisitions). See Note 8 – Long-Term Debt in the notes to the consolidated financial statements. Income tax expense increased $16 million between 2018 and 2017 primarily due to the net benefit of $12 million from remeasurement of Centuri’s deferred tax liabilities related to enactment of U.S. tax reform in December 2017 and from an increase in taxable earnings in 2018. These increases were partially offset by lower U.S. income tax rates applied to taxable earnings in 2018. 2017vs.2016 Contribution to consolidated net income from utility infrastructure services increased $5.7 million in 2017 compared to 2016. Results were positively impacted by the remeasurement of Centuri’s deferred tax liabilities related to the enactment of U.S. tax reform noted above. Higher utility infrastructure services costs outpaced increased revenue, but were partially offset by lower depreciation. Revenues increased $107.4 million, or 9%, between 2017 and 2016, primarily due to additional pipe replacement work for natural gas distribution customers. This was partially offset by the temporary work stoppage with a significant customer noted earlier, which was due to regulatory issues attributable to requalifying employees of all contractors working on the customer’s natural gas system. Operations resumed during the second quarter of 2017 following the requalification period. In addition, Centuri performed work on a multi-year water pipe replacement program, which began in late 2016, for a customer that contributed incremental revenues of $29.7 million during 2017. Utility infrastructure services revenues includes contracts with Southwest totaling $97 million in 2017 and $98 million in 2016. Utility infrastructure services expenses increased by $124.5 million, or 12%, between 2017 and 2016. The increase in Utility infrastructure services expenses was disproportionate to the increase in revenues between these years due in part to logistics surrounding the timing and length of the temporary work stoppage noted above and higher labor costs incurred to complete work during inclement weather conditions in the first quarter of 2017. Expenses and results in 2017 were negatively impacted by costs related to the water pipe replacement project, a dispute for which was resolved in 2018. Gains on sale of equipment (reflected as an offset to Utility infrastructure services expenses) were approximately $4.2 million and $7.1 million for 2017 and 2016, respectively. Depreciation and amortization expense decreased $6.6 million between 2017 and 2016 primarily due to a $10 million reduction in depreciation associated with a change in the estimated useful lives of certain depreciable equipment, partially offset by incremental SOUTHWEST GAS HOLDINGS, INC. | 41 amortization of finite-lived intangible assets recognized from the Neuco acquisition and an increase in depreciation on additional equipment purchased to support the growing volume of work being performed. The increase in net interest deductions was due primarily to interest expense and amortization of debt issuance costs associated with incremental borrowings under the then existing $450 million secured revolving credit and term loan facility. Income tax expense decreased $17.5 million between 2017 and 2016 primarily due to the $12 million net benefit from remeasurement of deferred tax liabilities following the enactment of U.S. tax reform. Pre-tax income declined $12.6 million between 2017 and 2016. Rates and Regulatory Proceedings Southwest is subject to the regulation of the Arizona Corporation Commission (“ACC”), the Public Utilities Commission of Nevada (“PUCN”), the California Public Utilities Commission (“CPUC”), and the Federal Energy Regulatory Commission (“FERC”). GeneralRateReliefandRateDesign Rates charged to customers vary according to customer class and rate jurisdiction and are set by the individual state and federal regulatory commissions that govern Southwest’s service territories. Southwest makes periodic filings for rate adjustments as the costs of providing service (including the cost of natural gas purchased) changes, and as additional investments in new or replacement pipeline and related facilities are made. Rates are intended to provide for recovery of all commission-approved costs and provide a reasonable return on investment. The mix of fixed and variable components in rates assigned to various customer classes (rate design) can significantly impact the operating margin actually realized by Southwest. Management has worked with its regulatory commissions in designing rate structures that strive to provide affordable and reliable service to its customers while mitigating the volatility in prices to customers and stabilizing returns to investors. Such rate structures were in place in all of Southwest’s operating areas during all periods for which results of natural gas operations are disclosed above. Nevada Jurisdiction NevadaGeneralRateCase. Southwest filed its most recent general rate case with the PUCN in May 2018 and updated the request following the certification period ending in July 2018. The filing requested a statewide overall general rate increase of approximately $29.7 million to account for changes in the cost of service ($12.1 million) since the last general rate case, including those resulting from U.S. federal tax reform, and another $16.6 million associated with the inclusion in rate base of GIR mechanism projects previously approved by the PUCN under the ongoing program. Southwest also requested to adjust the GIR rate as part of the rate case process in lieu of filing a separate GIR rate application. That adjustment equates to an estimated incremental operating margin of $6 million. The PUCN issued a rate case decision on December 24, 2018, which authorized a return on equity (“ROE”) of 9.25% relative to the Company’s proposed capital structure of 49.66% equity applicable to both southern and northern Nevada and provided for an overall general rate increase of $9.5 million in southern Nevada and a rate decrease in northern Nevada of $2 million. The impact of U.S. tax reform was considered on a go-forward basis, including commencing the process to return excess amounts from the remeasurement of previous deferred tax balances. The PUCN also approved Southwest’s proposal to maintain its existing rate structure, including the continuation of its decoupling mechanism, referred to as the General Revenues Adjustment (the “GRA”). Southwest also proposed and was authorized to include two new tariff schedules (1) compression service and (2) biogas and renewable natural gas service. New rates associated with the PUCN’s decision became effective in January 2019. The rate relief is lower than the amounts requested due to several factors, including the 9.25% granted return on equity, vis-à-vis a requested 10.3%. Also contributing to the lower-than-expected result was the exclusion of costs of several software applications in 42 | SOUTHWEST GAS HOLDINGS, INC. rates at this time, albeit allowing the Company to reiterate its recovery request in its next general rate case filing. In response to the PUCN’s decision, management filed a Petition for Reconsideration (the “Petition”) of several rate case issues on January 9, 2019. The PUCN Staff also filed a Petition for Reconsideration requesting several technical clarifications on the rate case decision with respect to how to calculate the intended results of the decision. The PUCN, in turn, issued a decision regarding both petitions on February 15, 2019 that modified certain parts of the original order, but granted no further rate relief. The modified final decision results in a general rate increase of $9.5 million in southern Nevada and a rate decrease in northern Nevada of $2 million. The decision included a reduction in depreciation expense of $800,000 and results in a net increase in revenues of $7.1 million and an increase in operating income of $7.9 million. Management is currently evaluating additional administrative strategies, including pursuing judicial appeal of the PUCN’s rate order and/or accelerating its next general rate case filing. General Revenues Adjustment. As part of the Annual Rate Adjustment (“ARA”) filing in 2017, the PUCN authorized rate adjustments associated with the GRA. The rate adjustment returned $2.2 million to customers during 2018, a decrease in collections of $15.8 million as compared to 2017. In June 2018, Southwest filed to adjust the GRA surcharge, effective January 2019, which was approved by the PUCN during the fourth quarter of 2018. This rate adjustment is expected to result in collections from customers of $5.6 million. As indicated above, the continuation of the GRA was affirmed as part of the December 2018 rate case decision. While there is no impact to net income overall from this rate adjustment, operating cash flows will increase as the associated regulatory asset balance is recovered. Infrastructure Replacement Mechanisms. In 2014, the PUCN approved final rules for the GIR mechanism which defers and recovers certain costs associated with accelerated replacement of qualifying infrastructure that would not otherwise currently provide incremental revenues. Associated with the replacement of various types of pipe infrastructure under the mechanism (Early Vintage Plastic Pipe (“EVPP”), Customer-Owned Yard Line (“COYL”), and Vintage Steel Pipe (“VSP”)), each year Southwest files a GIR “Advance Application” in May and a “Rate Application,” generally in October. In May 2017, Southwest filed its Advance Application for projects totaling approximately $66 million to be completed during 2018, which the PUCN approved in September 2017. The $66 million in replacement work had an annualized revenue requirement estimated at $6 million. In June 2018, Southwest filed its Advance Application requesting authorization to replace qualifying infrastructure with projects totaling $228 million to be completed over a three-year period, with a total annualized revenue requirement (following the three-year replacement period) of approximately $21.7 million. Historically, Southwest has requested approval of projects on an annual basis; however, it requested to move to a multi- year approval process for projects to improve operational flexibility and enhance coordination with contractors and governmental agencies. The PUCN issued a decision limiting its approval to the 2019 projects, resulting in an annual approval of $34.3 million for projects to be completed in 2019 (EVPP $9.3 million, COYL $1.3 million, and VSP $23.7 million). The Rate Application is generally filed each October to reset the GIR recovery surcharge related to previously approved and completed projects, with new rates becoming effective each January. In November 2017, for projects approved in 2016 and completed by July 2017, a deferred annualized revenue requirement of $8.7 million was approved to be recovered from customers through updated rates effective January 2018. Included as part of the 2018 general rate case filing (noted above), management proposed to adjust the GIR surcharge rate as part of the rate case in lieu of filing a separate application during the third quarter. The rate was approved to be implemented in January 2019 and is expected to result in incremental annual margin of approximately $6 million. Conservation and Energy Efficiency(“CEE”). In June 2015, Southwest requested recovery of energy efficiency and conservation development and implementation costs, including promotions and incentives for various programs, as originally approved for deferral by the PUCN effective November 2009. While recovery of initial program costs were approved effective in 2013, amounts incurred subsequent to May 2012 (the related certification period) continued to be deferred. The 2017 ARA filing approved in November 2017, modified rates effective January 2018, designed to result in annualized margin decreases of $8.2 million in southern Nevada and $1.4 million in northern Nevada to return over-collected balances. As part of the 2018 ARA filing, Southwest requested modified SOUTHWEST GAS HOLDINGS, INC. | 43 rates, effective January 2019, which would authorize an annualized margin decrease of $4.1 million in southern Nevada and a $58,000 decrease in northern Nevada, both of which were approved. There is, however, no anticipated impact to net income overall from these changes as amortization expense will be impacted by approximately the same amounts. ExpansionandEconomicDevelopmentLegislation. In January 2016, final regulations were approved by the PUCN associated with legislation (“SB 151”) previously introduced and signed into law in Nevada. The legislation authorized natural gas utilities to expand their infrastructure to provide service to unserved and underserved areas in Nevada. In November 2017, Southwest filed for pre-approval of a project to extend service to Mesquite, Nevada, in accordance with the SB 151 regulations. Ultimately, the PUCN issued an order approving Southwest’s proposal to expand natural gas infrastructure to Mesquite. The order approved a capital investment of approximately $28 million and the construction of approximately 37 miles of distribution pipeline (including the approach main). The cost is expected to be recovered through volumetric rates from all southern Nevada customers (including new customers in Mesquite). The annual revenue requirement associated with the project is $2.8 million. Southwest conducted preliminary design work and began serving certain customers with an approved virtual pipeline network in February 2019, which will provide temporary natural gas supply using portions of the approved distribution system and compressed natural gas tanks. It is estimated that permitting and construction of the approach main to bring the permanent supply to Mesquite and construction of the remaining approved distribution system could take an additional two years to complete. California Jurisdiction CaliforniaGeneralRateCase. As part of the most recent Southwest general rate case application, with rates effective June 2014, the CPUC authorized an overall revenue increase of $7.1 million, a Post-Test Year (“PTY”) Ratemaking Mechanism, which allowed for annual attrition increases of 2.75% annually for 2015 to 2018, a depreciation reduction as requested, a limited COYL inspection program for schools, and an Infrastructure Reliability and Replacement Adjustment Mechanism (“IRRAM”) to recover the costs associated with the new limited COYL program. The CPUC decision also provided for a two-way pension balancing account to track differences between authorized and actual pension funding amounts. In December 2016, Southwest filed to modify the most recent general rate case decision to extend the current rate case cycle by two years, including extension of the annual PTY attrition adjustments for 2019 and 2020. Without the rate case extension, Southwest would have otherwise been required to file its next general rate application by September 2017. Expedited consideration was requested and in June 2017, the CPUC approved the request, thereby extending the rate case filing deadline. Southwest believes this extension is in the public interest as it provides rate stability to customers for two additional years consistent with the current reasonable rates approved as part of the last general rate case. The 2.75% PTY annual attrition adjustments were authorized for the two additional years. Southwest expects to file a general rate case application in the third quarter of 2019. TaxReform. In its 2017 decision approving Southwest’s request to extend the filing date of its next general rate case, the CPUC also directed Southwest to track income tax expenses resulting from mandatory or elective changes in tax law, procedure, or policy. The purpose is to identify differences between Southwest’s authorized income tax expenses and its actual incurred income tax expenses, the result of which would be reviewed in Southwest’s next general rate case. Excluding advance requested or required procedural changes, Southwest does not currently anticipate making an ad hoc filing in advance of the next general rate case filing to implement any changes resulting from U.S. tax reform. Refer to Note 1 – Background, Organization, and Summary of Significant Accounting Policies, Note 5 – Regulatory Assets and Liabilities, and Note 13 – Income Taxes. AttritionFiling. In November 2018, Southwest made its latest annual PTY attrition filing, requesting annual revenue increases of $2 million in southern California, $542,000 in northern California, and $271,000 for South Lake Tahoe. This filing was approved in December 2018 and rates were made effective in January 2019. At the same time, rates were updated to recover the regulatory asset associated with the revenue decoupling mechanism, or margin tracker. 44 | SOUTHWEST GAS HOLDINGS, INC. GreenhouseGas(“GHG”)Compliance. California Assembly Bill Number 32 and the regulations promulgated by the California Air Resources Board, require Southwest, as a covered entity, to comply with all applicable requirements associated with California GHG emissions reporting and the California Cap and Trade Program. The CPUC issued a decision in March 2018 adopting an allocation methodology to distribute the net revenues or costs for years 2015-2017 beginning in the second quarter of 2018. Southwest began amortizing its then existing net cost balance over a 12-month period with recovery rates effective July 2018 for all applicable rate schedules. In addition, for years 2019-2020, the decision adopted an allocation methodology to distribute the revenue proceeds through a California Climate Credit to active residential customers in April of each year, following initial required credits in October 2018. GHG compliance costs recovered through rates (including transportation customer rates) have no impact on earnings. Arizona Jurisdiction Arizona General Rate Case. Southwest filed a general rate application with the ACC in May 2016 requesting an increase in authorized annual operating revenues of approximately $32 million for its Arizona rate jurisdiction. A settlement was reached, with new rates effective April 2017. The ACC approved the settlement agreement in April 2017, which provided for an overall annual operating revenue increase of $16 million, the capital structure and cost of capital originally proposed by Southwest, and a return on common equity set at 9.50%. Annual depreciation expense was designed to be reduced by $44.7 million, as supported by a depreciation study included in the filing, for a combined net annual operating income increase of $60.7 million. Other key elements included approval of the continuation and expansion of the COYL program (adding the ability to seek out COYLs through a targeted approach and mobilization of work crews for replacement), implementation of a vintage steel pipe replacement program, and a continuation of the current decoupled rate design (excluding the previous winter-period adjustment to rates), which made the mechanism fundamentally similar to that which exists in Nevada. The settlement also included a property tax tracking mechanism to defer changes in property tax expense for recovery or return in the next general rate case. The settlement also included a three-year rate case moratorium prohibiting filing a new application to adjust base rates prior to May 2019. Southwest plans to file a new application in May 2019. DeliveryChargeAdjustment. The annual Delivery Charge Adjustment (“DCA”) rate adjustment is filed each April, which along with other reporting requirements, contemplates a rate to recover the over- or under-collected margin tracker amounts based on the balance at the end of the preceding calendar year. The DCA rate adjustment filed in April 2018, reflected the December 31, 2017 balance of approximately $40 million. Following a brief administrative delay, Southwest updated its request to instead include the balance at December 31, 2018 of $73 million. Southwest currently expects the updated rate to be approved and become effective during the first quarter of 2019. The existing rate continues to be collected from customers until such time as the updated rate becomes effective. While there is no impact to net income overall from this rate adjustment, operating cash flows will increase as the associated regulatory asset balance is collected. TaxReform. In February 2018, the ACC directed all Arizona utilities to address tax savings from the enactment of U.S. tax reform beginning January 1, 2018 through a tax expense adjuster mechanism, a notice of intent to file a rate case, or through a separate application. In April 2018, Southwest filed an application with the ACC, requesting approval for a tax refund process or, in the alternative, the authority to file a general rate case to reflect tax reform. Ultimately, Southwest was instructed to refund customers a one-time credit to reflect the tax savings from January through July 2018, effective with Southwest’s August 2018 billing cycles and that, effective August 2018, surcredits be established on a per-therm basis until new cost-of-service rates become effective following the Company’s next general rate case, with the combined amounts intended to refund $20 million annually (as compared to rate levels established in the most recent general rate case effective April 2017). Other recommendations included supplemental compliance reports related to excess deferred income taxes and an annual true-up to account for differences between the actual tax savings and the amount authorized by the ACC. However, the ACC decision did not direct refunding to commence with regard to excess amounts from the remeasurement of deferred tax balances, which are recognized as a regulatory liability following the enactment of tax reform. Through December 2018, Southwest reflected the annualized $20 million as a reduction in revenue and is tracking monthly SOUTHWEST GAS HOLDINGS, INC. | 45 differences between amounts expected to be returned and amounts actually returned to customers, resulting in a liability balance of $1.8 million as of December 31, 2018. Liquefied Natural Gas (“LNG”) Facility. In January 2014, Southwest filed an application with the ACC seeking preapproval to construct, operate, and maintain a 233,000 dekatherm LNG facility in southern Arizona. This facility is intended to enhance service reliability and flexibility related to natural gas deliveries in the southern Arizona area by providing a local storage option, to be operated by Southwest and connected directly to its distribution system. In December 2014, Southwest received an order from the ACC granting preapproval of the construction and deferral of costs, up to $50 million, which was later approved (December 2016) to be modified not to exceed $80 million, following land purchase and bid solicitation for the engineering, procurement, and construction of the facility. Construction began during the third quarter of 2017 and is expected to be substantially complete in the second quarter of 2019 with the facility available for use during the winter of 2019/2020. Through December 2018, Southwest has incurred approximately $60 million in capital expenditures toward the project (including land acquisition costs). COYLProgram. Southwest received approval, in connection with its 2010 Arizona general rate case, to implement a program to conduct leak surveys, and if leaks were present, to replace and relocate service lines and meters for Arizona customers whose meters were set off from the customer’s home, representing a non-traditional configuration. “Phase II” of the COYL program included the replacement of non-leaking COYLs. The surcharge is revised annually as the program progresses. In the annual filing made in February 2018, Southwest requested to establish an annual surcharge to collect $4.2 million related to the revenue requirement associated with $18 million in capital projects completed under both phases during 2017. In September 2018, the ACC approved the proposed surcharge application, while modifying the surcharge revenue to $3.5 million to reflect the impact of tax reform on the revenue requirement calculation. VintageSteelPipeProgram. Southwest received approval, in connection with its 2010 Arizona general rate case, to implement a VSP replacement program. Southwest currently has approximately 6,000 miles of pre-1970s vintage steel pipe in Arizona. Southwest proposed to start replacing the pipe on an accelerated basis and to recover the costs through an annual surcharge filing that is made in February of each year. The surcharge is designed to be revised annually as the program progresses. Southwest replaced approximately 119 miles of vintage steel pipe during 2018 totaling approximately $100 million, and is targeting replacement projects during 2019 of approximately $100 million. In the February 2018 VSP filing, Southwest requested to establish a surcharge to collect $3.1 million related to 2017 expenditures. In September 2018, the ACC approved the proposed surcharge application, while modifying the surcharge revenue to $2.4 million to reflect the impact of tax reform on the revenue requirement calculation. The annual VSP filing is expected to be made in the first quarter of 2019. FERC Jurisdiction GeneralRateCase. Paiute Pipeline Company (“Paiute”), a wholly owned subsidiary of Southwest, filed its most recent general rate case with the FERC in February 2014, and following settlement proceedings, tariff changes were filed in March 2015. The settlement implied an 11.5% pre-tax rate of return, and as part of the agreement, Paiute agreed to file a rate case no later than May 2019. Refer to Note 1 – Background, Organization, and Summary of Significant Accounting Policies, Note 5 – Regulatory Assets and Liabilities and Liabilities, and Note 13 – Income Taxes. 2018 Expansion. In response to growing demand in the Carson City and South Lake Tahoe areas of northern California and northern Nevada, Paiute evaluated shipper interest in acquiring additional transportation capacity; executed precedent agreements for incremental transportation capacity with Southwest during the third quarter of 2016; and initiated a pre-filing review process with the FERC in October 2016, at which time approval for an expansion was granted. Following this process, a certificate application was filed, including an applicant environmental assessment, and in May 2018, the FERC issued a Certificate of Public Convenience and Necessity authorizing Paiute to construct the $18 million project. Following receipt of contractor pricing for the project, Paiute 46 | SOUTHWEST GAS HOLDINGS, INC. updated the project costs to reflect approximately $22 million and requested to amend the certificate order to reflect the updated cost estimates. In October 2018, the FERC issued an order to reflect the updated costs of the project. Construction work began in July 2018 and consists of 8.5 miles of additional transmission pipeline infrastructure. The project was completed and placed in service in November 2018. TaxReform. The FERC issued a Notice of Proposed Rulemaking (“NOPR”) on whether the federal income tax changes from U.S. tax reform cause pipeline rates to no longer be just and reasonable. The NOPR provided for pipelines to file a FERC Form No. 501-G to evaluate the impact of tax reform on their revenue requirement. In addition to filing the form, pipelines would select one of the following four options: (1) make a limited “Section 4” filing to reduce rates by the percentage reduction in cost of service shown in its FERC Form No. 501-G; (2) commit to file either a prepackaged uncontested rate settlement or a general Section 4 rate case; (3) file a statement explaining why no change in rates was necessary; or (4) file the new FERC form without taking any other action. In July 2018, the FERC issued a final rule (Order No. 849), effective in September 2018, adopting procedures for determining which jurisdictional pipelines may be collecting unjust and unreasonable rates in light of tax reform. Paiute filed its Form No. 501-G in the fourth quarter of 2018. Two of Paiute’s shippers requested that FERC evaluate Paiute’s rates and/or take action to ensure that Paiute’s customers are afforded the relief contemplated in Order No. 849. The FERC has yet to act on these; however, in the absence of any action in advance, Paiute’s general rate case application, expected to be filed in May 2019, will further address tax reform. In November 2018, Southwest Gas Transmission Company (“SGTC”), also a FERC-regulated subsidiary of Southwest, filed an uncontested, prepackaged settlement in lieu of filing the FERC Form No. 501-G, with no material impacts overall. FERC issued an Order approving the settlement in December 2018, and new rates became effective in January 2019. PGA Filings The rate schedules in all of Southwest’s service territories contain provisions that permit adjustments to rates as the cost of purchased gas changes. These deferred energy provisions and purchased gas adjustment clauses are collectively referred to as “PGA” clauses. Differences between gas costs recovered from customers and amounts paid for gas by Southwest result in over- or under-collections. At December 31, 2018, over-collections in Arizona, southern Nevada, and California resulted in a liability of approximately $79.8 million and under-collections in northern Nevada resulted in an asset of $4.9 million on the Company’s and Southwest’s balance sheets. During the third quarter of 2018, a $49 million refund was received by Southwest from El Paso Natural Gas, LLC (“El Paso”) as part of a rate case settlement, the majority of which relates to Southwest’s transmission service into Arizona. Filings to change rates in accordance with PGA clauses are subject to audit by state regulatory commission staffs. PGA changes impact cash flows but have no direct impact on profit margin. However, gas cost deferrals and recoveries can impact comparisons between periods of individual Consolidated Statements of Income components. These include Gas operating revenues, Net cost of gas sold, Net interest deductions, and Other income (deductions). In October 2018, Southwest filed an application with the ACC requesting an alternate methodology for refunding the El Paso funds allocated to the Arizona rate jurisdiction customers, which would involve offsetting amounts currently receivable from Arizona customers under a different mechanism (the margin decoupling mechanism). Resolution of this issue is expected during the first quarter of 2019. The following table presents Southwest’s outstanding PGA balances receivable/(payable) at the end of its two most recent fiscal years (thousands of dollars): Arizona Northern Nevada Southern Nevada California 2018 2017 $(72,878) $ 5,069 8,189 (6,841) 1,323 4,928 (5,951) (933) $(74,834) $ 7,740 SOUTHWEST GAS HOLDINGS, INC. | 47 ArizonaPGAFilings. In Arizona, Southwest calculates the change in the gas cost component of customer rates monthly (to allow for timely refunds to/recoveries from customers), utilizing a rolling twelve-month average. During 2018, the Gas Cost Balancing Account changed from a surcharge position (to address the then-under-collected balance) to a surcredit in order to refund the over- collected balance at year end. CaliforniaGasCostFilings. adjustments modeled in this fashion provide the timeliest recovery of gas costs in any Southwest jurisdiction. In California, a monthly gas cost adjustment based on forecasted monthly prices is utilized. Monthly NevadaARAApplication. In November 2018, Southwest filed to adjust its quarterly Deferred Energy Account Adjustment rate, which is based upon a twelve-month rolling average, in addition to requesting adjusted Base Tariff Energy rates, both of which were approved effective January 2019. These new rates are intended to collect or refund the outstanding balances over a twelve-month period. GasPriceVolatilityMitigation Regulators in Southwest’s service territories have encouraged Southwest to take proactive steps to mitigate price volatility to its customers. To accomplish this, Southwest periodically enters into fixed-price term contracts and Swaps under its collective volatility mitigation programs for a portion (up to 25% in the Arizona and California jurisdictions) of its annual normal weather supply needs. For the 2018/2019 heating season, contracts contained in the fixed-price portion of the supply portfolio ranged from approximately $2.05 to approximately $4.15 per dekatherm. Southwest makes natural gas purchases, not covered by fixed-price contracts, under variable-price contracts with firm quantities, and on the spot market. The contract price for these contracts is determined at the beginning of each month to reflect that month’s published first-of-month index price. The contract price of commitments to purchase gas at daily market prices is based on a published daily price index. In either case, the index price is not published or known until the purchase period begins. Southwest does not currently enter into swaps or fixed-price purchases for its Nevada territories. See Note 14 – Derivatives. Pipeline Safety Regulation Congress passed the Pipeline Safety, Regulatory Certainty, and Job Creation Act of 2011 (“the Bill”), effective January 2012, which increased/strengthened previously existing safety requirements, including damage prevention programs, penalty provisions, and requirements related to automatic and remote-controlled shut-off valves, public awareness programs, incident notification, and maximum allowable operating pressure for certain facilities. The Bill required the Department of Transportation to conduct further study of existing programs and future requirements; these studies are nearing their completion and proposed regulation changes by the Pipeline and Hazardous Materials Safety Administration (“PHMSA”) are anticipated in 2019. Southwest continues to monitor changing pipeline safety legislation and participates, to the extent possible, in developing associated mandates and reporting requirements. Additionally, it works with its state and federal commissions to develop customer rates that are responsive to incremental costs of compliance. However, due to the timing of when rates are implemented in response to new requirements, and as additional rules are developed, compliance requirements could impact expenses and the timing and amount of capital expenditures. Capital Resources and Liquidity Over the past three years, cash on hand and cash flows from operations have generally provided the majority of cash used in investing activities (primarily construction expenditures and property additions). Certain pipe replacement work of Southwest was accelerated during these years to take advantage of bonus depreciation tax incentives (prior to 2018) and to fortify system integrity and reliability, notably in association with new gas infrastructure replacement programs as discussed previously. During the same period, the Company was able to establish long-term cost savings from debt refinancing and strategic debt redemptions. The Company’s 48 | SOUTHWEST GAS HOLDINGS, INC. capitalization strategy is to maintain an appropriate balance of equity and debt to maintain strong investment-grade credit ratings, which should minimize interest costs. CashFlows The enactment of U.S. tax reform will have an impact on future cash flows. The magnitude of the impact depends on the results of future regulatory proceedings surrounding the method and timing (which management cannot currently predict) of reflecting net tax benefits in customer rates. Due to the reduction in the applicable U.S. federal income tax rate from 35% to 21%, deferred tax assets and liabilities were remeasured. The reduction in plant-related deferred tax differences was reclassified to a regulatory liability. The period and timing of return are subject to Internal Revenue Code (“IRC”) provisions and regulatory actions in each jurisdiction. See the Rates and Regulatory Proceedings section, Note 5 – Regulatory Assets and Liabilities, and Note 13 – Income Taxes in the notes to consolidated financial statements for more information about potential developments regarding this topic. Southwest Gas Holdings, Inc.: OperatingCashFlows. Cash flows provided by consolidated operating activities increased $159 million between 2018 and 2017. Changes in operating cash flows are typically influenced significantly by the change in purchased gas costs, including amounts incurred and deferred, as well as when amounts are incorporated in customer bills to recover or return the deferred balances. In the third quarter 2018, as ordered by the FERC, El Paso refunded to Southwest $49 million previously billed to Southwest for transmission services in association with El Paso’s 2010 rate case. This amount is included in cash flows provided by operating activities in 2018 and will be refunded to customers in the future. Investing Cash Flows. Cash used in consolidated investing activities increased $299 million in 2018 as compared to 2017. The change was primarily due to Centuri’s acquisition of its 80% interest in Linetec (see Note 19 – Business Acquisitions). In addition, increased construction expenditures in the natural gas operations segment, including scheduled and accelerated replacement activity, contributed to the increase. FinancingCashFlows. Net cash provided by consolidated financing activities increased $166 million in 2018 as compared to 2017. The increase included the issuance of $300 million of senior notes in March 2018 by Southwest. During 2018, $63 million in payments were made to pay down short-term borrowings under credit facilities; however, in 2017, proceeds from short-term borrowing collectively by Southwest and the Company in the amount of $215 million were received, in addition to $145 million under the long-term portion of Southwest’s facility. The prior year also included a payment of $23 million by Southwest Gas Holdings, Inc. associated with a noncontrolling interest in Centuri previously held by other parties, and repayment of $25 million in medium-term notes by Southwest. The current period reflects net proceeds from the issuance by the Company of approximately $84 million under its Equity Shelf Program ($41 million in 2017) and $260 million during 2018 in common stock in an underwritten public offering (primarily to facilitate the Linetec acquisition at Centuri). Refer to Note 7 – Common Stock. Dividends paid increased in 2018 as compared to 2017 as a result of an increase in the quarterly dividend rate and an increase in the number of shares outstanding. During 2018, the Company issued approximately 143,000 shares of common stock through the Dividend Reinvestment and Stock Purchase Plan (“DRSPP”), raising approximately $10.6 million. Southwest Gas Corporation: OperatingCashFlows. Cash flows provided by operating activities increased $73 million between 2018 and 2017. The increase in operating cash flows was primarily attributable to the change in deferred purchased gas costs as discussed above, offset by other working capital changes such as the timing and sum of amounts related to Accounts receivable and associated net impacts of surcharge SOUTHWEST GAS HOLDINGS, INC. | 49 and surcredit activity associated with regulatory programs, which impact cash flows but not net income. Refer to Results of Natural Gas Operations and Rates and Regulatory Proceedings. Investing Cash Flows. Cash used in investing activities increased $112 million in 2018 as compared to 2017. The change was primarily due to increases in construction expenditures, as indicated above. FinancingCashFlows. Net cash provided by financing activities increased $14 million in 2018 as compared to 2017. The increase was primarily due to the issuance of $300 million in senior notes in March 2018 and higher capital contributions from Southwest Gas Holdings, Inc., offset by repayment of amounts outstanding under the short-term portion of Southwest’s credit facility. The prior period included $145 million in proceeds from borrowings under the long-term portion, and $191 million in borrowings under the short-term portion, of the Southwest credit facility and repayment of $25 million in medium-term notes. The capital requirements and resources of the Company generally are determined independently for the natural gas operations and utility infrastructure services segments. Each business activity is generally responsible for securing its own financing sources. However, the holding company may raise funds through stock issuance or other external financing sources in support of each business segment, as discussed above and in Note 7 – Common Stock. 2018ConstructionExpenditures During the three-year period ended December 31, 2018, total gas plant in service increased from $5.9 billion to $7.1 billion, or at an average annual rate of 7%. Replacement, reinforcement, and franchise work was a substantial portion of the plant increase. To a lesser extent, customer growth impacted expenditures as Southwest set approximately 90,000 meters during the three-year period. During 2018, construction expenditures for the natural gas operations segment were $683 million. The majority of these expenditures represented costs associated with scheduled and accelerated replacement of existing transmission, distribution, and general plant to fortify system integrity and reliability. Cash flows from operating activities of Southwest were $383 million and provided approximately 50% of construction expenditures and dividend requirements of the natural gas operations segment. Other necessary funding was provided by cash on hand, external financing activities, capital contributed by Southwest Gas Holdings, Inc., and, as needed, existing credit facilities. 2018FinancingActivity Net proceeds under the Equity Shelf Program for 2018 were $84 million, comprised of an aggregate of 1,145,705 shares of Southwest Gas Holdings, Inc. common stock sold in the open market at a weighted average price of $74.32 per share, net of $851,500 in agent commissions. These net proceeds were contributed to Southwest by the holding company. As of December 31, 2018, the Company had up to $23 million of common stock available for sale under the program. See Note 7 – Common Stock for more information. In November 2018, the Company sold an aggregate of 3,565,000 shares of common stock in an underwritten public offering under its effective universal shelf registration statement, at $75.50 per share, resulting in proceeds to the Company of $260 million, net of $9 million underwriters’ discount. The Company used the net proceeds from the offering to fund a portion of the purchase price of Linetec, to repay part of the Company’s credit facility, and used the remaining amounts for general corporate purposes. Refer to Note 19 – Business Acquisitions regarding the acquisition of Linetec, and Note 9 – Short-Term Debt for information on the Company’s credit facility. Three-YearConstructionExpenditures,DebtMaturities,andFinancing Management estimates natural gas segment construction expenditures during the three-year period ending December 31, 2021 will be approximately $2.1 billion. Of this amount, approximately $710 million is expected to be incurred in 2019. Southwest plans to 50 | SOUTHWEST GAS HOLDINGS, INC. continue to request regulatory support to accelerate projects that improve system flexibility and reliability (including replacement of early vintage plastic and steel pipe). This includes the recent approval to complete accelerated replacement projects in Nevada of $35.3 million in 2019. Southwest may expand existing, or initiate new, programs. Significant replacement activities are expected to continue well beyond the next few years. See also Rates and Regulatory Proceedings for discussion of Nevada infrastructure, Arizona COYL, and an LNG facility. During the three-year period, cash flows from operating activities of Southwest are expected to provide approximately 45% to 50% of the funding for gas operations total construction expenditures and dividend requirements. Any additional cash requirements are expected to be provided by existing credit facilities, equity contributions from the Company, and/or other external financing sources. The timing, types, and amounts of any additional external financings will be dependent on a number of factors, including the cost of gas purchases, conditions in the capital markets, timing and amounts of rate relief, timing differences remaining between U.S. federal taxes currently embedded in customer rates and amounts implemented under tax reform, as well as growth levels in Southwest’s service areas and earnings. External financings could include the issuance of debt securities, bank and other short-term borrowings, and other forms of financing. Liquidity Liquidity refers to the ability of an enterprise to generate sufficient amounts of cash through its operating activities and external financing to meet its cash requirements. Several general factors (some of which are out of the control of the Company) that could significantly affect liquidity in future years include: variability of natural gas prices, changes in the ratemaking policies of regulatory commissions, regulatory lag, customer growth in the natural gas segment’s service territories, the ability to access and obtain capital from external sources, interest rates, changes in income tax laws, pension funding requirements, inflation, and the level of earnings. Natural gas prices and related gas cost recovery rates, as well as plant investment, have historically had the most significant impact on liquidity. On an interim basis, Southwest defers over- or under-collections of gas costs to PGA balancing accounts. In addition, Southwest uses this mechanism to either refund amounts over-collected or recoup amounts under-collected as compared to the price paid for natural gas during the period since the last PGA rate change went into effect. During 2018, the combined balance in the PGA accounts totaled an over-collection of $74.8 million. See PGA Filings for more information. In March 2017, the Company entered into a credit facility with a borrowing capacity of $100 million that expires in March 2022. The Company utilizes this facility for short-term financing needs. The maximum amount outstanding during 2018 occurred during the first quarter and was $23.5 million. At December 31, 2018, no borrowings were outstanding on this facility. The maximum amount outstanding on the credit facility during each of the second, third, and fourth quarters was $22.5 million. Southwest has a $400 million credit and commercial paper facility which expires in March 2022. Southwest designates $150 million of the $400 million facility for long-term borrowing needs and the remaining $250 million for working capital purposes. The maximum amount outstanding during 2018 occurred during the first quarter and was $378 million ($150 million outstanding on the long-term portion of the credit facility, including $50 million on the commercial paper program, in addition to $228 million outstanding on the short-term portion). At December 31, 2018, $150 million was outstanding on the long-term portion of the credit facility ($50 million of which was in commercial paper), and $152 million was outstanding on the short-term portion. The maximum amount outstanding on the long-term portion of the credit facility (including the commercial paper program) during each of the second, third, and fourth quarters was $72 million, $159 million, and $302 million, respectively. The credit facility can be used as necessary to meet liquidity requirements, including temporarily financing under-collected PGA balances, meeting the refund needs of over-collected balances, or temporarily funding capital expenditures. At December 31, 2018, the credit facility was deemed adequate for working capital needs outside of funds raised through operations and other types of external financing. SOUTHWEST GAS HOLDINGS, INC. | 51 In March 2018, Southwest issued $300 million in 3.70% senior notes at a discount of 0.185%. The notes will mature in March 2028. The net proceeds were used to temporarily pay down, in full, the amount outstanding under the revolving portion of the credit facility and the remainder was used to repay amounts outstanding under the commercial paper program under the credit facility. Southwest has a $50 million commercial paper program as noted above. Any issuance under the commercial paper program is supported by the revolving credit facility and, therefore, does not represent additional borrowing capacity. Any borrowing under the commercial paper program will be designated as long-term debt. Interest rates for the commercial paper program are calculated at the then current commercial paper rate. At December 31, 2018, $50 million was outstanding on the commercial paper program. There were no long-term debt maturities in 2018. In November 2018, in association with the acquisition of Linetec (refer to Note 19 – Business Acquisitions), Centuri amended its secured revolving credit and term loan facility, increasing the borrowing capacity from $450 million to $590 million. The line of credit portion of the facility increased to $325 million; amounts borrowed and repaid under the revolving credit facility are available to be re-borrowed. The term loan facility portion has a limit of $265 million, which was reached in November 2018 after refinancing of the existing term loan noted above and additional borrowing that occurred under the amended facility. No further borrowing is permitted under the term loan facility. The $590 million secured revolving credit and term loan facility expires in November 2023. At December 31, 2018, $256 million was outstanding (after repayments) on the term facility. The maximum amount outstanding on the credit facility during 2018 was $294 million, which occurred in the third quarter, at which point $191 million was outstanding on the term loan facility. As of December 31, 2018, there was no balance outstanding and approximately $306 million, net of outstanding letters of credit, was available to be borrowed on the Centuri secured revolving credit facility. CreditRatings Credit ratings apply to debt securities such as bonds, notes, and other debt instruments and do not apply to equity securities such as common stock. Borrowing costs and the ability to raise funds are directly impacted by the credit ratings of the Company. Credit ratings issued by nationally recognized ratings agencies (Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s Ratings Services (“Standard & Poor’s”), and Fitch Ratings (“Fitch”)) provide a method for determining the credit worthiness of an issuer. Credit ratings are important because long-term debt constitutes a significant portion of total capitalization. These credit ratings are a factor considered by lenders when determining the cost of future debt for both Southwest and Southwest Gas Holdings, Inc. (i.e., generally the better the rating, the lower the cost to borrow funds). The current unsecured long-term debt ratings of both companies are all considered investment grade. Southwest Gas Holdings, Inc.: Issuer rating Outlook Last reaffirmed Southwest Gas Corporation: Senior unsecured long-term debt Outlook Last reaffirmed Moody’s (1) Standard & Poor’s (2) Fitch (3) Baa1 Stable January 2019 BBB+ Negative November 2018 BBB+ Stable November 2018 A3 Stable January 2019 BBB+ Negative November 2018 A Stable November 2018 (1) Moody’s debt ratings range from Aaa (highest rating possible) to C (lowest quality, usually in default). Moody’s applies an A rating to obligations which are considered upper-medium grade obligations with low credit risk. A numerical modifier of 1 (high end of the category) through 3 (low end of the category) is included with the A to indicate the approximate rank of a company within the range. (2) Standard & Poor’s (“S&P”) debt ratings range from AAA (highest rating possible) to D (obligation is in default). The S&P rating of BBB+ indicates the issuer of the debt is regarded as having an adequate capacity to pay interest and repay principal. The ratings from ‘AA’ to ‘CCC’ 52 | SOUTHWEST GAS HOLDINGS, INC. may be modified by the addition of a plus “+” or minus “-” sign to show relative standing within the major rating categories. The S&P outlook of “negative” was updated in November 2018 in consideration of an assumed cash flow impact from U.S. tax reform and growth in the utility infrastructure services segment. (3) Fitch debt ratings range from AAA (highest credit quality) to D (defaulted debt obligation). The Fitch rating of A indicates low default risk and a strong ability to pay financial commitments. The modifiers “+” or “-” may be appended to a rating to denote relative status within major rating categories. A credit rating is not a recommendation to buy, sell, or hold a debt security, but is intended to provide an estimation of the relative level of credit risk of debt securities, and is subject to change or withdrawal at any time by the rating agency. The foregoing credit ratings are subject to change at any time in the discretion of the applicable ratings agency. Numerous factors, including many that are not within management’s control, are considered by the ratings agencies in connection with assigning credit ratings. None of Southwest’s debt instruments have credit triggers or other clauses that result in default if these bond ratings are lowered by rating agencies. Interest and fees on certain debt instruments are subject to adjustment depending on Southwest’s bond ratings. Certain debt instruments are subject to a leverage ratio cap and the 6.1% note due 2041 is also subject to a minimum net worth requirement. At December 31, 2018, Southwest was in compliance with all of its covenants. Under the most restrictive of the financial covenants, approximately $2.1 billion in additional debt could be issued and the leverage ratio requirement would still be met. At least $1.2 billion of cushion in equity relating to the minimum net worth requirement exists at December 31, 2018. No specific limitations as to dividends exist under the collective covenants. None of the debt instruments contain material adverse change clauses. At December 31, 2018, Southwest Gas Holdings, Inc. was also in compliance with all of its credit facility covenants. Interest and fees on the credit facility are subject to adjustment depending on its bond ratings. The credit facility is subject to a leverage ratio cap. No specific limitations as to dividends exist under the collective covenants. The credit facility does not contain a material adverse change clause. Certain Centuri debt instruments have leverage ratio caps and fixed charge ratio coverage requirements. At December 31, 2018, Centuri was in compliance with all of its covenants. Under the most restrictive of the covenants, Centuri could issue over $101 million in additional debt and meet the leverage ratio requirement. Centuri has at least $78 million of cushion relating to the minimum fixed charge ratio coverage requirement. Centuri’s revolving credit and term loan facility is secured by underlying assets of the utility infrastructure services segment. Centuri also has restrictions on how much it could give to the Company in cash dividends, which is limited to 60% of Centuri’s consolidated net income. BonusDepreciation In 2017, with the enactment of U.S. tax reform, the bonus depreciation deduction percentage changed from 50% to 100% for “qualified property” placed in service after September 27, 2017 and before 2023. The bonus depreciation tax deduction phases out starting in 2023, by 20% for each of the five following years. Qualified property excludes public utility property; however, in August 2018 the Treasury Department and Internal Revenue Service issued proposed regulations clarifying the appropriate calculation of certain 2017 bonus depreciation. The Company estimates bonus depreciation will defer the payment of approximately $21 million (none of which relates to utility operations) of federal income taxes for 2019. Inflation Inflation can impact results of operations for Southwest and Centuri. Labor, employee benefits, natural gas, professional services, and construction costs are the categories most significantly impacted by inflation. Changes to the cost of gas are generally recovered through PGA mechanisms and do not significantly impact net earnings. Labor, employee benefits and professional services are SOUTHWEST GAS HOLDINGS, INC. | 53 components of the cost of service, and gas infrastructure costs are the primary component of utility rate base. In order to recover increased costs, and earn a fair return on rate base, general rate cases are filed by Southwest, when deemed necessary, for review and approval by regulatory authorities. Regulatory lag, that is, the time between the date increased costs are incurred and the time such increases are recovered through the ratemaking process, can impact earnings. See Rates and Regulatory Proceedings for a discussion of recent rate case proceedings. Off-BalanceSheetArrangements All debt is recorded on the balance sheet. Long-term operating and capital leases are described in Note 2 – Utility Plant and Leases of the Notes to Consolidated Financial Statements, and included in the Contractual Obligations table below. ContractualObligations The table below summarizes the Company’s contractual obligations at December 31, 2018 (millions of dollars): Contractual Obligations Operating leases Gas purchase obligations Pipeline capacity/storage Derivatives Other commitments Long-term debt, including current maturities Interest on long-term debt Total Payments due by period Total 2019 2020-2021 2022-2023 Thereafter $ 45 128 642 3 24 2,140 1,140 $ 11 89 100 3 13 33 85 $4,122 $334 $ 14 35 149 — 11 197 160 $566 $ 9 1 107 — — 639 130 $886 $ 11 3 286 — — 1,271 765 $2,336 In the table above, operating leases represent multi-year obligations for office rent and certain equipment. Gas purchase obligations include fixed-price and variable-rate gas purchase contracts covering approximately 236 million dekatherms. The fixed-price contracts range in price from approximately $2.05 to approximately $4.15 per dekatherm. Variable-price contracts reflect minimum contractual obligations, with estimation in pricing. Excluded from the table is $75.6 million of purchase consideration related to the Linetec acquisition in the form of liabilities incurred that remained unpaid as of December 31, 2018. See Note 19 – Business Acquisitions. Southwest has pipeline capacity/storage contracts for firm transportation service, both on a short- and long-term basis, with several companies for all of its service territories, some with terms extending to 2044. Southwest also has interruptible contracts in place that allow additional capacity to be acquired should an unforeseen need arise. Costs associated with these pipeline capacity contracts are a component of the cost of gas sold and are recovered from customers primarily through the PGA mechanisms. Included in the pipeline capacity payments shown in the above table, are payments associated with storage that Southwest has contracted for in Arizona and southern California. The terms of these contracts extend through 2019 and 2024, respectively. Debt obligations in the table above consist of scheduled principal and interest payments over the life of the debt. Interest rates in effect at December 31, 2018 on variable rate long-term debt were assumed to remain in effect in the future periods disclosed in the table. In the table above, interest on long-term debt includes future interest payments of $1.09 billion for Southwest and $48 million for Centuri. Pension: Estimated funding for pension and other postretirement benefits during calendar year 2019 is $55 million and is not included in the table above. 54 | SOUTHWEST GAS HOLDINGS, INC. Recently Issued Accounting Standards Updates The FASB recently issued Accounting Standards Updates related to revenue recognition, leases, net periodic benefit cost, measurement of credit losses, reclassification of certain tax effects from Accumulated Other Comprehensive Income, accounting for implementation costs in a cloud computing arrangement, disclosure requirements for defined benefit plans and fair value measurement, and simplifying the test for goodwill impairment. See Note 1 – Background, Organization, and Summary of Significant Accounting Policies for more information regarding these Accounting Standards Updates and their potential impact on financial position, results of operations, and disclosures. Application of Critical Accounting Policies A critical accounting policy is one which is very important to the portrayal of the financial condition and results of a company, and requires the most difficult, subjective, or complex judgments of management. The need to make estimates about the effect of items that are uncertain is what makes these judgments difficult, subjective, and/or complex. Management makes subjective judgments about the accounting and regulatory treatment of many items and bases its estimates on historical experience and on various other assumptions that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments. These estimates may change as new events occur, as more experience is acquired, as additional information is obtained, and as the operating environment changes. While management may make many estimates and judgments, many would not be materially altered, or provide a material impact to the financial statements taken as a whole, if different estimates, or means of estimation were employed. The following are accounting policies that are deemed critical to the financial statements. For more information regarding significant accounting policies, see Note 1 – Background, Organization, and Summary of Significant Accounting Policies. RegulatoryAccounting Natural gas operations are subject to the regulation of the ACC, the PUCN, the CPUC, and the FERC. The accounting policies of the Company and Southwest conform to U.S. GAAP applicable to rate-regulated entities and reflect the effects of the ratemaking process. As such, the Company and Southwest are allowed to defer, as regulatory assets, costs that otherwise would be expensed, if it is probable that future recovery from customers will occur. Companies are also permitted to recognize, as regulatory assets, amounts associated with various revenue decoupling mechanisms, as long as the requirements of alternative revenue programs permitted under U.S. GAAP continue to be met. Management reviews the regulatory assets to assess their ultimate recoverability within the approved regulatory guidelines. If rate recovery is no longer probable, due to competition or the actions of regulators, write-off of the related regulatory asset (which would be recognized as current-period expense) is required. Regulatory liabilities are recorded if it is probable that revenues will be reduced for amounts that will be credited to customers through the ratemaking process. The timing and inclusion of costs in rates is often delayed (regulatory lag) and results in a reduction of current-period earnings. Refer to Note 5 – Regulatory Assets and Liabilities for a list of regulatory assets and liabilities. AccruedUtilityRevenues Revenues related to the sale and/or delivery of natural gas are generally recorded when natural gas is delivered to customers. However, the determination of natural gas sales to individual customers is based on the reading of their meters, which is performed on a systematic basis throughout the month. At the end of each month, operating margin associated with natural gas service that has been provided but not yet billed is accrued. This accrued utility revenue is estimated each month based primarily on applicable rates, number of customers, rate structure, analyses reflecting significant historical trends, seasonality, and experience. The interplay of these assumptions can impact the variability of the accrued utility revenue estimates. All Southwest rate jurisdictions have decoupled rate structures, limiting variability due to extreme weather conditions. AccountingforIncomeTaxes The Company is subject to income taxes in the U.S. and Canada. Income tax calculations require estimates due to known future tax rate changes, book to tax differences, and uncertainty with respect to regulatory treatment of certain property items. The asset and SOUTHWEST GAS HOLDINGS, INC. | 55 liability method of accounting is utilized for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Regulatory tax assets and liabilities are recorded to the extent management believes they will be recoverable from or refunded to customers in future rates. 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. With the enactment of U.S. tax reform, management undertook processes to remeasure these balances. Management regularly assesses financial statement tax provisions to identify any change in the regulatory treatment or tax-related estimates, assumptions, or enacted tax rates that could have a material impact on cash flows, financial position, and/or results of operations. Refer to Note 1 – Background, Organization, and Summary of Significant Accounting Policies, Note 5 – Regulatory Assets and Liabilities, and Note 13 – Income Taxes. AccountingforPensionsandOtherPostretirementBenefits Southwest has a noncontributory qualified retirement plan with defined benefits covering substantially all employees. In addition, there is a separate unfunded supplemental retirement plan which is limited to officers. Pension obligations and costs for these plans are affected by the amount and timing of cash contributions to the plans, the return on plan assets, discount rates, and by employee demographics, including age, compensation, and length of service. Changes made to the provisions of the plans may also impact current and future pension costs. Actuarial formulas are used in the determination of pension obligations and costs and are affected by actual plan experience and assumptions about future experience. Key actuarial assumptions include the expected return on plan assets, the discount rate used in determining the projected benefit obligation and pension costs, and the assumed rate of increase in employee compensation. Relatively small changes in these assumptions (particularly the discount rate) may significantly affect pension obligations and costs for these plans. For example, a change of 0.25% in the discount rate assumption would change the pension plan projected benefit obligation by approximately $40.9 million and future pension expense by $4.0 million. A change of 0.25% in the employee compensation assumption would change the pension obligation by approximately $7.6 million and expense by $1.6 million. A 0.25% change in the expected asset return assumption would change pension expense by approximately $2.2 million (but has no impact on the pension obligation). At December 31, 2018, the discount rate is 4.50%, increased from the 3.75% rate used at December 31, 2017. The methodology utilized to determine the discount rate was consistent with prior years. The weighted-average rate of compensation escalation remains at 3.25%. The asset return assumption of 7.00% to be used for 2019 expense is consistent with the rate used for 2018. Pension costs for 2019 are estimated to decrease approximately $9.1 million as compared to that experienced in 2018. Future years’ expense level movements (up or down) will continue to be greatly influenced by long-term interest rates, asset returns, and funding levels. Goodwill Goodwill is assessed for impairment annually as of October, or more frequently, if events or changes in circumstances indicate an impairment may have occurred before that time. As permitted under accounting guidance on testing goodwill for impairment, we perform either a qualitative assessment or a quantitative assessment of each of our reporting units based on management’s judgment. Adjustment of values would only occur if conditions of impairment were deemed to be permanent. With respect to our qualitative industry and market assessments, we consider events and circumstances specific to us, such as macroeconomic conditions, considerations, cost factors, and overall financial performance, when evaluating whether it is more likely than not that the fair values of our reporting units are less than their respective carrying amounts. The assumptions we use in our analysis are subject to uncertainty, and declines in the future performance of our reporting units and changing business conditions could result in the recognition of impairment charges, which could be significant. The Company’s reporting units are the same as its segments (natural gas operations and utility infrastructure services) for purposes of impairment evaluation. Almost all of the goodwill on the Company’s consolidated balance sheet pertains to our utility infrastructure services segment. 56 | SOUTHWEST GAS HOLDINGS, INC. BusinessCombinations In accordance with U.S. GAAP, the assets acquired and liabilities assumed in an acquired business are recorded at their estimated fair values on the date of acquisition. The amount of goodwill initially recognized in a business combination is based on the excess of the purchase price of the acquired company over the fair value of the other assets acquired and liabilities assumed. The determination of these fair values requires management to make significant estimates and assumptions. For example, assumptions with respect to the timing and amount of future revenues and expenses associated with an asset are used to determine its fair value but the actual timing and amount may differ materially resulting in impairment of the asset’s recorded value. In some cases, the Company engages independent third-party valuation firms to assist in determining the fair values of acquired assets and liabilities assumed. Critical estimates in valuing certain intangible assets include but are not limited to future expected cash flows of the acquired business, trademarks, customer relationships, technology obsolescence, and discount rates. In addition, uncertain tax positions and tax-related valuation allowances assumed in connection with a business combination are initially estimated at the acquisition date. These items are reevaluated quarterly, based upon facts and circumstances that existed at the acquisition date with any adjustments to the preliminary estimates being recorded to goodwill, provided that the Company is within the twelve-month measurement period allowed by authoritative guidance. Subsequent to the measurement period or the final determination of the estimated value of the tax allowance or contingency, whichever comes first, changes to these uncertain tax positions and tax-related valuation allowances will affect the provision for income taxes in the Consolidated Statements of Income, and could have a material impact on the Company’s results of operations and financial position. Goodwill is evaluated for impairment no less frequently than annually. The fair value assigned to the intangible assets acquired and liabilities assumed, and the determination of goodwill associated with the current acquisition, are described in Note 19 – Business Acquisitions. Certifications The SEC requires the filing of certifications of the Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”) of registrants regarding reporting accuracy, disclosure controls and procedures, and internal control over financial reporting as exhibits to periodic filings. The CEO and CFO certifications for the period ended December 31, 2018 are included as exhibits to the 2018 Annual Report on Form 10-K filed with the SEC. Forward-Looking Statements This annual report contains statements which constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 (“Reform Act”). All statements other than statements of historical fact included or incorporated by reference in this annual report are forward-looking statements, including, without limitation, statements regarding management’s plans, objectives, goals, intentions, projections, strategies, future events or performance, and underlying assumptions. The words “may,” “if,” “will,” “should,” “could,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “continue,” “forecast,” “intend,” “promote,” “seek,” and similar words and expressions are generally used and intended to identify forward-looking statements. For example, statements regarding operating margin patterns, customer growth, the composition of our customer base, price volatility, seasonal patterns, payment of debt, interest savings, the Company’s COLI strategy, replacement market and new construction market, expectations for acquired businesses of the utility infrastructure services segment to be accretive to earnings during the first year following acquisition, expected impacts of valuation adjustments associated with the redeemable noncontrolling interest of Linetec, the impacts of U.S. tax reform including disposition in regulatory proceedings and bonus depreciation tax deductions, the impact of recent PHMSA rulemaking, the amounts and timing for completion of estimated future construction expenditures, including the LNG facility in southern Arizona and the final cost of the Paiute 2018 expansion project in northern Nevada and northern California, forecasted operating cash flows and results of operations, net earnings impacts from gas infrastructure replacement surcharges, funding sources of cash requirements, amounts generally expected to be reflected in 2018 or future period revenues from regulatory rate proceedings including amounts resulting from the settled Arizona rate case and the Nevada rate case including any administrative strategies related thereto, rates and surcharges, PGA, and other rate adjustments, sufficiency of working capital and current credit facilities, bank lending practices, the Company’s views regarding its liquidity SOUTHWEST GAS HOLDINGS, INC. | 57 position, ability to raise funds and receive external financing capacity and the intent and ability to issue common stock under the Equity Shelf Program and under our universal shelf registration statement, the intent and ability to issue various financing instruments and stock under the December 2017 shelf registration statement, future dividend increases and the Board’s current target dividend payout ratio, pension and post-retirement benefits, certain impacts of tax acts, the effect of any rate changes or regulatory proceedings, contract or construction change order negotiations, impacts of accounting standard updates, infrastructure replacement mechanisms and COYL programs, statements regarding future gas prices, gas purchase contracts and derivative financial instruments, recoverability of regulatory assets, the impact of certain legal proceedings, and the timing and results of future rate hearings and approvals are forward-looking statements. All forward-looking statements are intended to be subject to the safe harbor protection provided by the Reform Act. A number of important factors affecting the business and financial results of the Company could cause actual results to differ materially from those stated in the forward-looking statements. These factors include, but are not limited to, customer growth rates, conditions in the housing market, the ability to recover costs through the PGA mechanisms or other regulatory assets, the effects of regulation/ deregulation, governmental or regulatory policy regarding natural gas or alternative energy, the timing and amount of rate relief, the timing and methods determined by regulators to refund amounts to customers resulting from U.S. tax reform, changes in rate design, variability in volume of gas or transportation service sold to customers, changes in gas procurement practices, changes in capital requirements and funding, the impact of conditions in the capital markets on financing costs, changes in construction expenditures and financing, changes in operations and maintenance expenses, effects of pension expense forecasts, accounting changes and regulatory treatment related thereto, future liability claims, changes in pipeline capacity for the transportation of gas and related costs, results of Centuri bid work, Centuri’s projections about the acquired business’ earnings (including accretion within the first twelve months) and future acquisition-related costs, impacts of changes in value of the redeemable noncontrolling interest if at other than fair value, resolution of events subject to cash consideration held back associated with representations, warranties, and other estimates including working capital adjustments related to the Linetec acquisition, Centuri utility infrastructure expenses, differences between actual and originally expected outcomes of Centuri bid or other fixed-price construction agreements, outcomes from contract and change order negotiations, ability to successfully procure new work, impacts from work awarded or failing to be awarded from significant customers, the mix of work awarded, the amount of work awarded to Centuri following the lifting of work stoppages, acquisitions, and management’s plans related thereto, competition, our ability to raise capital in external financings, our ability to continue to remain within the ratios and other limits subject to our debt covenants, and ongoing evaluations in regard to goodwill and other intangible assets. In addition, the Company can provide no assurance that its discussions regarding certain trends relating to its financing, revenues, and operating expenses will continue in future periods. For additional information on the risks associated with the Company’s and Southwest’s businesses, see Item 1A. Risk Factors and Item 7A. Quantitative and Qualitative Disclosures About Market Risk in this Annual Report on Form 10-K for the year ended December 31, 2018. All forward-looking statements in this annual report are made as of the date hereof, based on information available to the Company and Southwest as of the date hereof, and the Company and Southwest assume no obligation to update or revise any of their forward- looking statements even if experience or future changes show that the indicated results or events will not be realized. We caution you to not rely unduly on any forward-looking statement(s). Common Stock Price and Dividend Information The principal market on which the common stock of the Company is traded is the New York Stock Exchange and the ticker symbol of the stock is “SWX.” At February 15, 2019, there were 12,497 holders of record of common stock, and the market price of the common stock was $80.63. Dividends are payable on the Company’s common stock at the discretion of the Board of Directors (“Board”). In setting the dividend rate, the Board considers, among other factors, current and expected future earnings levels, our ongoing capital expenditure plans and 58 | SOUTHWEST GAS HOLDINGS, INC. expected external funding needs, our payout ratio, and our ability to maintain strong credit ratings and liquidity. The quarterly common stock dividend declared was 45 cents per share throughout 2016, 49.5 cents per share throughout 2017, and 52 cents per share throughout 2018. The Company has paid dividends on its common stock since 1956 and has increased that dividend each year since 2007. In February 2019, the Board elected to increase the quarterly dividend from $0.52 to $0.545 per share, representing a 4.8% increase, effective with the June 2019 payment. The Board currently targets a payout ratio of 55% to 65% of consolidated earnings per share. SOUTHWEST GAS HOLDINGS, INC. | 59 [THIS PAGE INTENTIONALLY LEFT BLANK] 60 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (Thousands of dollars, except par value) December 31, ASSETS Utility plant: Gas plant Less: accumulated depreciation Construction work in progress Net utility plant Other property and investments Current assets: Cash and cash equivalents Accounts receivable, net of allowances Accrued utility revenue Income taxes receivable, net Deferred purchased gas costs Prepaid and other current assets Total current assets Noncurrent assets: Goodwill Deferred income taxes Deferred charges and other assets Total noncurrent assets Total assets 2018 2017 $ 7,134,239 (2,234,029) 193,028 $ 6,629,644 (2,231,242) 125,248 5,093,238 4,523,650 623,551 428,180 85,361 413,926 77,200 14,653 4,928 243,701 839,769 359,045 1,264 440,862 801,171 43,622 347,375 78,200 7,960 14,581 165,294 657,032 179,314 1,480 447,410 628,204 $ 7,357,729 $ 6,237,066 SOUTHWEST GAS HOLDINGS, INC. | 61 December 31, CAPITALIZATION AND LIABILITIES Capitalization: Common stock, $1 par (authorized – 60,000,000 shares; issued and outstanding – 53,026,848 and 48,090,470 shares) Additional paid-in capital Accumulated other comprehensive income (loss), net Retained earnings Total Southwest Gas Holdings, Inc. equity Noncontrolling interest Total equity Redeemable noncontrolling interest Long-term debt, less current maturities Total capitalization Commitments and contingencies (Note 10) Current liabilities: Current maturities of long-term debt Short-term debt Accounts payable Customer deposits Income taxes payable, net Accrued general taxes Accrued interest Deferred purchased gas costs Other current liabilities Total current liabilities Deferred income taxes and other credits: Deferred income taxes and investment tax credits, net Accumulated removal costs Other deferred credits and other long-term liabilities Total deferred income taxes and other credits Total capitalization and liabilities The accompanying notes are an integral part of these statements. 2018 2017 $ $ 54,656 1,305,769 (52,668) 944,285 49,720 955,332 (47,682) 857,398 2,252,042 (452) 1,814,768 (2,365) 2,251,590 81,831 2,107,258 1,812,403 — 1,798,576 4,440,679 3,610,979 33,060 152,000 248,993 67,940 1,083 43,560 21,369 79,762 290,878 25,346 214,500 228,315 69,781 5,946 43,879 17,870 6,841 203,403 938,645 815,881 529,201 383,000 1,066,204 476,960 315,000 1,018,246 1,978,405 1,810,206 $7,357,729 $6,237,066 62 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (In thousands, except per share amounts) Year Ended December 31, Operating revenues: Gas operating revenues Utility infrastructure services revenues Total operating revenues Operating expenses: Net cost of gas sold Operations and maintenance Depreciation and amortization Taxes other than income taxes Utility infrastructure services expenses Total operating expenses Operating income Other income and (expenses): Net interest deductions Other income (deductions) Total other income and (expenses) Income before income taxes Income tax expense Net income Net income (loss) attributable to noncontrolling interests 2018 2017 2016 $1,357,728 1,522,285 $1,302,308 1,246,484 $1,321,412 1,139,078 2,880,013 2,548,792 2,460,490 419,388 406,393 249,212 59,898 1,387,689 355,045 392,763 250,951 57,946 1,148,963 397,121 381,964 289,132 52,376 1,024,423 2,522,580 2,205,668 2,145,016 357,433 343,124 315,474 (96,671) (17,426) (78,064) (6,030) (73,660) (10,291) (114,097) (84,094) (83,951) 243,336 61,684 181,652 (625) 259,030 65,088 193,942 101 231,523 78,468 153,055 1,014 Net income attributable to Southwest Gas Holdings, Inc. $ 182,277 $ 193,841 $ 152,041 Basic earnings per share Diluted earnings per share Average number of common shares Average shares (assuming dilution) $ $ 3.69 3.68 $ $ 4.04 4.04 $ $ 49,419 49,476 47,965 47,991 3.20 3.18 47,469 47,814 The accompanying notes are an integral part of these statements. SOUTHWEST GAS HOLDINGS, INC. | 63 SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Thousands of dollars) Year Ended December 31, Net Income Other comprehensive income (loss), net of tax Defined benefit pension plans: Net actuarial gain (loss) Amortization of prior service cost Amortization of net actuarial loss Regulatory adjustment Net defined benefit pension plans Forward-starting interest rate swaps (“FSIRS”): Amounts reclassified into net income Net forward-starting interest rate swaps Foreign currency translation adjustments Total other comprehensive income, net of tax Comprehensive income Comprehensive income (loss) attributable to noncontrolling interests Comprehensive income attributable to Southwest Gas Holdings, Inc. The accompanying notes are an integral part of these statements. 2018 2017 2016 $181,652 $193,942 $153,055 (15,524) 1,015 25,549 (6,257) (32,701) 828 15,776 12,590 (14,118) 828 16,781 (3,462) 4,783 (3,507) 29 2,541 2,541 (3,010) 4,314 2,073 2,073 1,771 337 2,075 2,075 161 2,265 185,966 (625) 194,279 112 155,320 1,019 $186,591 $194,167 $154,301 64 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (Thousands of dollars) Year Ended December 31, 2018 2017 2016 CASH FLOW FROM OPERATING ACTIVITIES: Net Income Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization Deferred income taxes Changes in current assets and liabilities: Accounts receivable, net of allowances Accrued utility revenue Deferred purchased gas costs Accounts payable Accrued taxes Other current assets and liabilities Gains on sale Changes in undistributed stock compensation AFUDC Changes in other assets and deferred charges Changes in other liabilities and deferred credits Net cash provided by operating activities $181,652 $193,942 $153,055 249,212 51,041 250,951 63,389 289,132 68,732 (15,862) 1,000 82,574 11,778 (11,955) (54,073) (1,703) 6,111 (3,627) (5,738) 38,446 (40,947) (2,000) (95,608) 19,961 2,112 (8,203) (4,196) 10,888 (2,296) (22,269) 4,231 30,096 (1,500) 45,858 21,695 26,340 (27,432) (7,148) 5,456 (2,289) 16,960 (18,447) 528,856 369,955 600,508 Year Ended December 31, CASH FLOW FROM INVESTING ACTIVITIES: Construction expenditures and property additions Acquisition of businesses, net of cash acquired Changes in customer advances Miscellaneous inflows Net cash used in investing activities CASH FLOW FROM FINANCING ACTIVITIES: Issuance of common stock, net Dividends paid Centuri distribution to redeemable noncontrolling interest Issuance of long-term debt, net Retirement of long-term debt Change in credit facility and commercial paper Change in short-term debt Principal payments on capital lease obligations Redemption of Centuri shares from noncontrolling parties Withholding remittance – share-based compensation Other Net cash provided by (used in) financing activities Effects of currency translation on cash and cash equivalents Change in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental information: Interest paid, net of amounts capitalized Income taxes paid (received) SOUTHWEST GAS HOLDINGS, INC. | 65 2018 2017 2016 (765,914) (251,373) 13,463 4,341 (623,649) (94,204) 323 16,645 (529,531) (17,000) 7,900 13,039 (999,483) (700,885) (525,592) 354,402 (100,240) — 565,172 (237,758) 41,155 (92,130) (204) 407,063 (338,969) — 145,000 214,500 (980) (23,000) (3,176) (3,074) (62,500) (648) — (3,110) (2,744) 472 (83,317) (439) 423,946 (255,273) (145,000) (18,000) (1,354) — (2,119) (1,569) 512,574 346,185 (82,653) (208) 301 (194) 41,739 43,622 15,556 28,066 (7,931) 35,997 $ 85,361 $ 43,622 $ 28,066 $ 86,562 $ 71,943 $ 67,440 $ 1,221 $ 5,673 $ (19,032) The accompanying notes are an integral part of these statements. 66 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (In thousands, except per share amounts) Southwest Gas Holdings, Inc. Equity Common Stock Shares Amount Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Retained Earnings Non- controlling Interest Total Redeemable Noncontrolling Interest (Temporary Equity) December 31, 2015 47,377 $ 49,007 $ 896,448 $ (50,268) $ 699,221 $ (2,083) $ 1,592,325 $ 16,108 Common stock issuances 105 105 6,675 Net income (loss) Redemption value adjustments Foreign currency exchange translation adjustment Net actuarial gain (loss) arising during the period, less amortization of unamortized benefit plan cost, net of tax FSIRS amounts reclassified to net income, net of tax Centuri distribution to redeemable noncontrolling interest Dividends declared Common: $1.80 per share 156 29 2,075 152,041 (134) (5,768) 6,780 151,907 (5,768) 1,148 5,768 156 5 29 2,075 (439) (86,231) (86,231) December 31, 2016 47,482 49,112 903,123 (48,008) 759,263 (2,217) 1,661,273 22,590 Common stock issuances 608 608 52,209 Net income (loss) Redemption value adjustments Foreign currency exchange translation adjustment Redemption of Centuri shares from noncontrolling parties Net actuarial gain (loss) arising during the period, less amortization of unamortized benefit plan cost, net of tax FSIRS amounts reclassified to net income, net of tax Centuri distribution to redeemable noncontrolling interest 193,841 (148) (355) 1,760 (3,507) 2,073 52,817 193,693 (355) 1,760 (3,507) 2,073 248 355 11 (23,000) (204) SOUTHWEST GAS HOLDINGS, INC. | 67 Southwest Gas Holdings, Inc. Equity Common Stock Shares Amount Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Retained Earnings Non- controlling Interest Total Redeemable Noncontrolling Interest (Temporary Equity) Dividends declared Common: $1.98 per share (95,351) (95,351) December 31, 2017 48,090 49,720 955,332 (47,682) 857,398 (2,365) 1,812,403 — Common stock issuances 4,936 4,936 353,147 358,083 Redeemable noncontrolling interest attributable to acquisition (a) Net income (loss) Foreign currency exchange translation adjustment Net actuarial gain (loss) arising during the period, less amortization of unamortized benefit plan cost, net of tax FSIRS amounts reclassified to net income, net of tax Reclassification of excess deferred taxes (b) Change in ownership of noncontrolling interest (c) Dividends declared Common: $2.08 per share 182,277 (797) 181,480 81,659 172 (3,010) 4,783 2,541 (9,300) 9,300 (2,710) 2,710 (3,010) 4,783 2,541 — — (104,690) (104,690) December 31, 2018 53,026 $54,656 $1,305,769 $(52,668) $ 944,285 $ (452) $2,251,590 $81,831 (a) The Company, through its subsidiary, Centuri, completed the acquisition of a privately held utility infrastructure services business. Refer to Note 19 – Business Acquisitions. (b) Release of excess deferred taxes accumulated prior to December 22, 2017 (date of enactment of the TCJA), as a result of the adoption of ASU 2018-02, which permitted such release. See Note 1 – Background, Organization, and Summary of Significant Accounting Policies. (c) Centuri, through its subsidiary, NPL, had historically held a 65% ownership interest in Intellichoice Energy, LLC (“ICE”). A residual interest of 35% has been held by a third party. During the second quarter of 2018, an additional $1 million of capital was contributed by NPL, thereby increasing NPL’s ownership interest to 95%. The carrying amount of the noncontrolling interest has been adjusted with a corresponding charge to Additional paid-in capital on the Company’s Consolidated Balance Sheet. The accompanying notes are an integral part of these statements. 68 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS CORPORATION AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (Thousands of dollars) December 31, ASSETS Utility plant: Gas plant Less: accumulated depreciation Construction work in progress Net utility plant Other property and investments Current assets: Cash and cash equivalents Accounts receivable, net of allowances Accrued utility revenue Income taxes receivable, net Deferred purchased gas costs Prepaid and other current assets Total current assets Noncurrent assets: Goodwill Deferred charges and other assets Total noncurrent assets Total assets 2018 2017 $ 7,134,239 (2,234,029) 193,028 $ 6,629,644 (2,231,242) 125,248 5,093,238 4,523,650 116,146 119,114 31,962 140,057 77,200 13,444 4,928 229,562 497,153 10,095 424,952 435,047 37,946 119,748 78,200 — 14,581 153,771 404,246 10,095 425,564 435,659 $ 6,141,584 $ 5,482,669 December 31, 2018 2017 SOUTHWEST GAS HOLDINGS, INC. | 69 CAPITALIZATION AND LIABILITIES Capitalization: Common stock Additional paid-in capital Accumulated other comprehensive income (loss), net Retained earnings Total equity Long-term debt, less current maturities Total capitalization Commitments and contingencies (Note 10) Current liabilities: Short-term debt Accounts payable Customer deposits Income taxes payable, net Accrued general taxes Accrued interest Deferred purchased gas costs Payable to parent Other current liabilities Total current liabilities Deferred income taxes and other credits: Deferred income taxes and investment tax credits, net Accumulated removal costs Other deferred credits and other long-term liabilities Total deferred income taxes and other credits Total capitalization and liabilities The accompanying notes are an integral part of these statements. $ $ 49,112 1,065,242 (49,049) 717,155 49,112 948,767 (47,073) 659,193 1,782,460 1,818,669 1,609,999 1,521,031 3,601,129 3,131,030 152,000 184,982 67,940 — 43,560 20,243 79,762 472 94,136 191,000 158,474 69,781 4,971 43,879 17,171 6,841 194 108,785 643,095 601,096 490,458 383,000 1,023,902 445,243 315,000 990,300 1,897,360 1,750,543 $6,141,584 $5,482,669 70 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (In thousands) Year Ended December 31, Continuing operations: Gas operating revenues Operating expenses: Net cost of gas sold Operations and maintenance Depreciation and amortization Taxes other than income taxes Total operating expenses Operating income Other income and (expenses): Net interest deductions Other income (deductions) Total other income and (expenses) Income from continuing operations before income taxes Income tax expense Net income from continuing operations Discontinued operations – utility infrastructure services: Income before income taxes Income tax expense Income Noncontrolling interests Income – discontinued operations Net income 2018 2017 2016 $1,357,728 $1,302,308 $1,321,412 419,388 404,813 191,816 59,898 355,045 391,321 201,922 57,946 397,121 381,964 233,463 52,376 1,075,915 1,006,234 1,064,924 281,813 296,074 256,488 (81,740) (17,240) (69,733) (6,388) (66,997) (11,484) (98,980) (76,121) (78,481) 182,833 43,991 219,953 63,135 178,007 58,584 138,842 156,818 119,423 — — — — — — — — — — 53,516 19,884 33,632 1,014 32,618 $ 138,842 $ 156,818 $ 152,041 The accompanying notes are an integral part of these statements. SOUTHWEST GAS HOLDINGS, INC. | 71 SOUTHWEST GAS CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Thousands of dollars) Year Ended December 31, Continuing operations: Net Income from continuing operations Other comprehensive income (loss), net of tax Defined benefit pension plans: Net actuarial gain (loss) Amortization of prior service cost Amortization of net actuarial loss Regulatory adjustment Net defined benefit pension plans Forward-starting interest rate swaps (“FSIRS”): Amounts reclassified into net income Net forward-starting interest rate swaps Total other comprehensive income (loss), net of tax from continuing operations Comprehensive income from continuing operations Discontinued operations – utility infrastructure services: Net income Foreign currency translation adjustments Comprehensive income Comprehensive income attributable to noncontrolling interests Comprehensive income attributable to discontinued operations – utility infrastructure services Comprehensive income 2018 2017 2016 $138,842 $156,818 $119,423 (15,524) 1,015 25,549 (6,257) (32,701) 828 15,776 12,590 (14,118) 828 16,781 (3,462) 4,783 (3,507) 29 2,541 2,541 2,073 2,073 2,075 2,075 7,324 (1,434) 2,104 146,166 155,384 121,527 — — — — — — — — — 32,618 161 32,779 5 — 32,774 $146,166 $155,384 $154,301 The accompanying notes are an integral part of these statements. 72 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (Thousands of dollars) CASH FLOW FROM OPERATING ACTIVITIES: Net Income Income from discontinued operations Income from continuing operations Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization Deferred income taxes Changes in current assets and liabilities: Accounts receivable, net of allowances Accrued utility revenue Deferred purchased gas costs Accounts payable Accrued taxes Other current assets and liabilities Changes in undistributed stock compensation AFUDC Changes in other assets and deferred charges Changes in other liabilities and deferred credits Net cash provided by operating activities CASH FLOW FROM INVESTING ACTIVITIES: Construction expenditures and property additions Changes in customer advances Miscellaneous inflows Dividends received Net cash used in investing activities 2018 2017 2016 $ 138,842 — $ 156,818 — $ 153,055 33,632 138,842 156,818 119,423 191,816 42,999 201,922 67,169 233,463 67,959 (20,309) 1,000 82,574 23,408 (18,732) (91,444) 5,355 (3,627) (7,049) 37,669 (7,902) (2,000) (95,608) 4,545 10,383 (13,726) 9,288 (2,296) (22,918) 3,541 40,731 (1,500) 45,858 16,183 19,391 (33,496) 5,456 (2,289) 16,611 (18,447) 382,502 309,216 509,343 (682,869) 13,463 14 — (560,448) 323 2,741 — (457,119) 7,900 2,982 12,461 (669,392) (557,384) (433,776) SOUTHWEST GAS HOLDINGS, INC. | 73 2018 2017 2016 CASH FLOW FROM FINANCING ACTIVITIES: Issuance of common stock, net Contributions from parent Dividends paid Issuance of long-term debt, net Retirement of long-term debt Change in credit facility and commercial paper Change in short-term debt Withholding remittance – share-based compensation Other — 113,549 (87,000) 297,495 — — (39,000) (3,110) (1,028) — 41,359 (81,497) — (25,000) 145,000 191,000 (3,176) (596) Net cash provided by (used in) financing activities 280,906 267,090 Net cash provided by discontinued operating activities Net cash used in discontinued investing activities Net cash used in discontinued financing activities Effects of currency translation on cash and cash equivalents Change in cash and cash equivalents Change in cash and cash equivalents included in discontinued operations utility infra- structure services assets Change in cash and cash equivalents of continuing operations Cash and cash equivalents at beginning of period — — — — — — — — (5,984) 18,922 — (5,984) 37,946 — 18,922 19,024 472 — (83,317) 296,469 (124,855) (145,000) (18,000) (2,119) (1,569) (77,919) 91,165 (91,816) (4,734) (194) (7,931) 5,579 (2,352) 21,376 Cash and cash equivalents at end of period Supplemental information: Interest paid, net of amounts capitalized Income taxes paid (received) $ $ $ 31,962 $ 37,946 $ 19,024 73,805 $ 64,790 $ 61,501 (5,856) $ (7,854) $ (31,011) The accompanying notes are an integral part of these statements. 74 | SOUTHWEST GAS HOLDINGS, INC. SOUTHWEST GAS CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF EQUITY (In thousands, except per share amounts) Common Stock Shares Amount Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) 47,377 $49,007 $ 890,671 6,675 105 105 $(47,743) Retained Earnings Total $ 701,251 $1,593,186 6,780 152,041 152,041 29 2,075 29 2,075 December 31, 2015 Common stock issuances Net income Net actuarial gain (loss) arising during the period, less amortization of unamortized benefit plan cost, net of tax FSIRS amounts reclassified to net income, net of tax Dividends declared Common: $1.80 per share December 31, 2016 Net income Net actuarial gain (loss) arising during the period, less amortization of unamortized benefit plan cost, net of tax FSIRS amounts reclassified to net income, net of tax Distribution to Southwest Gas Holdings, Inc. investment in discontinued operations Stock-based compensation (a) Dividends declared to Southwest Gas Holdings, Inc. Contributions from Southwest Gas Holdings, Inc. 47,482 49,112 897,346 (45,639) (3,507) 2,073 10,062 41,359 December 31, 2017 Net income Net actuarial gain (loss) arising during the period, less amortization of 47,482 49,112 948,767 (47,073) unamortized benefit plan cost, net of tax FSIRS amounts reclassified to net income, net of tax Stock-based compensation (a) Reclassification of excess deferred taxes (b) Dividends declared to Southwest Gas Holdings, Inc. Contributions from Southwest Gas Holdings, Inc. 4,783 2,541 (9,300) 2,926 113,549 December 31, 2018 47,482 $49,112 $1,065,242 $(49,049) $ 717,155 $1,782,460 (a) Stock-based compensation is based on stock awards of Southwest Gas Corporation to be issued in shares of Southwest Gas Holdings, Inc. (b) Release of excess deferred taxes accumulated prior to December 22, 2017 (date of enactment of the TCJA), as a result of the adoption of ASU 2018-02, which permitted such release. The accompanying notes are an integral part of these statements. (86,231) (86,231) 767,061 1,667,880 156,818 156,818 (3,507) 2,073 (182,773) 9,278 (81,129) 41,359 (182,773) (784) (81,129) 659,193 1,609,999 138,842 138,842 (680) 9,300 (89,500) 4,783 2,541 2,246 — (89,500) 113,549 SOUTHWEST GAS HOLDINGS, INC. | 75 Notes to Consolidated Financial Statements Note 1 – Background, Organization, and Summary of Significant Accounting Policies NatureofOperations. This is a combined annual report of Southwest Gas Holdings, Inc. and subsidiaries (the “Company”) and Southwest Gas Corporation and its subsidiaries (“Southwest” or the “natural gas operations segment”). The Notes to the Consolidated Financial Statements apply to both entities. Southwest Gas Holdings, Inc. is a holding company, owning all of the shares of common stock of Southwest and all of the shares of common stock of Centuri Construction Group, Inc. (“Centuri” or the “utility infrastructure services” segment). Prior to August 2017, 96.6% of Centuri’s shares were owned by the Company. During August 2017, the Company acquired the remaining 3.4% equity interest in Centuri that was held by the previous owners. Refer to Note 17 – Utility Infrastructure Services Noncontrolling Interests for additional information. Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Public utility rates, practices, facilities, and service territories of Southwest are subject to regulatory oversight. The timing and amount of rate relief can materially impact results of operations. Natural gas purchases and the timing of related recoveries can materially impact liquidity. Results for the natural gas operations segment are higher during winter periods due to the seasonality incorporated in its regulatory rate structures. Centuri is a comprehensive utility infrastructure services enterprise dedicated to delivering a diverse array of solutions to North America’s gas and electric providers. Centuri derives revenue from installation, replacement, repair, and maintenance of energy distribution systems, and developing industrial construction solutions. Centuri operations are generally conducted under the business names of NPL Construction Co. (“NPL”), Canyon Pipeline Construction, Inc. (“Canyon”), NPL Canada Ltd. (“NPL Canada”), W.S. Nicholls Construction, Inc. (“W.S. Nicholls”), and Canyon Special Projects, Inc. (“Special Projects,” formerly Brigadier Pipelines Inc.). Utility infrastructure services activity is seasonal in most of Centuri’s operating areas. Peak periods are the summer and fall months in colder climate areas, such as the northeastern and midwestern United States (“U.S.”) and in Canada. In warmer climate areas, such as the southwestern and southeastern U.S., utility infrastructure services activity continues year round. Centuri acquired New England Utility Constructors, Inc. (“Neuco”) in November 2017, thereby expanding its core services in the northeast region of the U.S. Additionally, in November 2018, Centuri expanded its operations in the southeast region of the U.S. through the acquisition of an 80% interest in a privately held utility infrastructure services business, Linetec Services, LLC (“Linetec”). See Note 19 – Business Acquisitions for more information. Basis of Presentation. The Company follows accounting principles generally accepted in the United States (“U.S. GAAP”) in accounting for all of its businesses. Unless specified otherwise, all amounts are in U.S. dollars. Accounting for natural gas utility operations conforms with U.S. GAAP as applied to rate-regulated companies and as prescribed by federal agencies and commissions of the various states in which the utility operates. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In connection with a holding company reorganization in January 2017, Centuri ceased to be a subsidiary of Southwest and became a subsidiary of the Company. To give effect to this change, the separate consolidated financial statements related to Southwest, which are included in this annual report, depict Centuri-related amounts for periods prior to January 2017 as discontinued operations which are detailed in Note 18 – Reorganization Impacts – Discontinued Operations Solely Related to Southwest Gas Corporation. Consolidation. The accompanying financial statements are presented on a consolidated basis for Southwest Gas Holdings, Inc. and all subsidiaries and Southwest Gas Corporation and all subsidiaries as of December 31, 2018 (except those accounted for using the 76 | SOUTHWEST GAS HOLDINGS, INC. equity method as discussed further below). All significant intercompany balances and transactions have been eliminated with the exception of transactions between Southwest and Centuri in accordance with accounting treatment for rate-regulated entities. Centuri, through its subsidiaries, historically held a 65% interest in a venture to market natural gas engine-driven heating, ventilating, and air conditioning technology and products. During the second quarter of 2018, an additional $1 million of capital was contributed, thereby increasing Centuri’s ownership to 95%. The carrying amount of the noncontrolling interest has been adjusted with a corresponding charge to Additional paid-in capital on the Company’s Consolidated Balance Sheet. Centuri, through its subsidiaries, holds a 50% interest in W.S. Nicholls Western Construction LTD. (“Western”), a Canadian infrastructure services company that is a variable interest entity. Centuri determined that it is not the primary beneficiary of the entity due to a shared-power structure; therefore, Centuri does not consolidate the entity and has recorded its investment, and results related thereto, using the equity method. The investment in Western totaled $11.2 million and $12.7 million at December 31, 2018 and 2017, respectively. Both periods include the impacts of foreign currency exchange translation adjustments. Centuri received $1 million in dividends from Western for the year ended December 31, 2018 and no dividends for the year ended December 31, 2017. The equity method investment in Western is included in Other property and investments in the Consolidated Balance Sheets of the Company. Centuri’s maximum exposure to loss as a result of its involvement with Western was estimated at $44.9 million as of December 31, 2018. The estimated maximum exposure to loss represents the maximum loss that would be absorbed by Centuri in the event that all of the assets of Western were deemed to be worthless. Centuri recorded earnings of approximately $500,000 from this investment in 2018, which is included in Other income (deductions) in the Consolidated Statements of Income. FairValueMeasurements. Certain assets and liabilities are reported at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. U.S. GAAP states that a fair value measurement should be based on the assumptions that market participants would use in pricing the asset or liability and establishes a fair value hierarchy that ranks the inputs used to measure fair value by their reliability. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to fair values derived from unobservable inputs (Level 3 measurements). Financial assets and liabilities are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement. The three levels of the fair value hierarchy are as follows: Level 1 – quoted prices (unadjusted) in active markets for identical assets or liabilities that a company has the ability to access at the measurement date. Level 2 – inputs other than quoted prices included within Level 1 that are observable for similar assets or liabilities, either directly or indirectly. Level 3 – unobservable inputs for the asset or liability. Unobservable inputs are used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. The Company primarily used quoted market prices and other observable market pricing information in valuing cash and cash equivalents, derivatives, long-term debt outstanding, and assets of the qualified pension plan and the PBOP required to be disclosed at fair value. Net Utility Plant. Net utility plant includes gas plant at original cost, less the accumulated provision for depreciation and amortization, plus the unamortized balance of acquisition adjustments. Original cost includes contracted services, material, payroll, SOUTHWEST GAS HOLDINGS, INC. | 77 and related costs such as taxes and certain benefits, general and administrative expenses, and an allowance for funds used during construction, less contributions in aid of construction. OtherPropertyandInvestments. Other property and investments on Southwest’s and the Company’s Consolidated Balance Sheets includes (thousands of dollars): Net cash surrender value of COLI policies Other property Total Southwest Gas Corporation Centuri property, equipment, and intangibles Centuri accumulated provision for depreciation and amortization Other property Total Southwest Gas Holdings, Inc. 2018 2017 $ 114,405 1,741 $ 117,341 1,773 116,146 792,191 (298,939) 14,153 119,114 554,730 (258,906) 13,242 $ 623,551 $ 428,180 Intangible assets (other than goodwill) are amortized using the straight-line method to reflect the pattern of Intangible Assets. economic benefits consumed over the estimated periods benefited. The recoverability of intangible assets is evaluated when events or circumstances indicate that a revision of estimated useful lives is warranted or that an intangible asset may be impaired. Non-utility intangible assets are associated with utility infrastructure services businesses acquired through 2018, including the Linetec acquisition. All have finite lives. These intangible assets are included in Other property and investments on the Company’s Consolidated Balance Sheets. Centuri has $159.8 million and $80.7 million of intangible assets at December 31, 2018 and 2017, respectively, as detailed in the following table (thousands of dollars): December 31, 2018 Customer relationships Trade names and trademarks Customer contracts backlog Noncompete agreements Total December 31, 2017 Customer relationships Trade names and trademarks Noncompete agreements Total Gross Carrying Amount Accumulated Amortization Net Carrying Amount $152,533 23,013 270 2,022 $(11,716) (5,234) (3) (1,064) $140,817 17,779 267 958 $177,838 $(18,017) $159,821 $ 76,254 13,754 2,060 $ (6,743) (4,080) (543) $ 69,511 9,674 1,517 $ 92,068 $(11,366) $ 80,702 Amortization expense for the acquired intangible assets listed above for the years ended December 31, 2018, 2017, and 2016 was $7.6 million, $4.1 million, and $3.2 million, respectively. 78 | SOUTHWEST GAS HOLDINGS, INC. The estimated future amortization of the intangible assets for the next five years and thereafter is as follows (in thousands): 2019 2020 2021 2022 2023 Thereafter Total $ 10,622 10,634 10,214 10,127 10,127 108,097 $159,821 See Note 2 – Utility Plant and Leases for additional information regarding natural gas operations intangible assets. Note 19 – Business Acquisitions includes detailed information about intangible assets purchased in the Linetec acquisition. CashandCashEquivalents. For purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand and financial instruments with maturities of three months or less. Such investments are carried at cost, which approximates market value. Cash and cash equivalents for Southwest and the Company also include money market fund investments totaling approximately $18 million and $59.9 million, respectively at December 31, 2018, and $20.8 million and $22.2 million, respectively, at December 31, 2017, which fall within Level 2 of the fair value hierarchy, due to the asset valuation methods used by money market funds. Typical non-cash investing activities for Southwest include customer advances applied as contributions toward utility construction activity and capital expenditures that were not paid as of year end that are included in accounts payable. Amounts related to such activities were immaterial for the periods presented herein. Non-cash investing activities for Centuri included $75.6 million of purchase consideration related to the Linetec acquisition in the form of liabilities incurred that remained unpaid as of December 31, 2018; such amounts are included in Other current liabilities on the Consolidated Balance Sheets of the Company. See Note 19 – Business Acquisitions. IncomeTaxes. The asset and liability method of accounting is utilized for the recognition of income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. 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. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. For regulatory and financial reporting purposes, investment tax credits (“ITC”) related to gas utility operations are deferred and amortized over the life of related fixed assets. As of December 31, 2018, the Company had cumulative book earnings of approximately $25 million in its foreign jurisdiction. Management previously asserted and continues to assert that all the earnings of Centuri’s Canadian subsidiaries will be permanently reinvested in Canada. As a result, no U.S. deferred income taxes have been recorded related to cumulative foreign earnings. In 2017, the Tax Cuts and Jobs Act (the “TCJA”) was enacted. The TCJA had significant impacts on the taxation of business entities, including specific provisions related to regulated public utilities. The more significant changes that impacted the Company include the reduction in the corporate federal income tax rate from 35% to 21%, and limiting the utilization of net operating losses (“NOLs”) to 80% of taxable income, with the ability to indefinitely carryforward unutilized NOLs to reduce future taxable income. The Financial Accounting Standards Board (the “FASB”) issued guidance to allow an accounting policy election of either (i) treating taxes attributable to future taxable income related to Global Intangible Low-Taxed Income (“GILTI”) as a current period expense when incurred or (ii) recognizing deferred taxes for temporary differences expected to reverse as GILTI in future years. The Company SOUTHWEST GAS HOLDINGS, INC. | 79 has elected to treat GILTI as a current period cost when incurred and has considered the estimated 2018 GILTI impact in its 2018 tax expense. DeferredPurchasedGasCosts. The various regulatory commissions have established procedures to enable Southwest to adjust its billing rates for changes in the cost of natural gas purchased. The difference between the current cost of gas purchased and the cost of gas recovered in billed rates is deferred. Generally, these deferred amounts are recovered or refunded within one year. Prepaidandothercurrentassets. Prepaid and other current assets for Southwest and the Company include gas pipe materials and operating supplies of $56 million in 2018 and $33 million in 2017 (carried at weighted average cost), and also include $74 million in 2018 and $40 million in 2017 related to a regulatory asset associated with the Arizona decoupling mechanism (an alternative revenue program). In the 2017 Arizona general rate case decision, the decoupled rate design was approved to continue, excluding a winter- period adjustment to rates, making the mechanism fundamentally similar to that which exists in Nevada. This change from a combination of monthly winter-period adjustments to bills (coupled with an annual rate adjustment) to an annual rate adjustment resulted in an increase in the associated regulatory asset noted above. Goodwill. As required by U.S. GAAP, goodwill is assessed for impairment annually, or more frequently, if circumstances indicate impairment to the carrying value of goodwill may have occurred. The goodwill impairment analysis is conducted as of October 1st each year and may start with an assessment of qualitative factors (commonly referred to as Step 0) to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the qualitative factors, management determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, or if management does not perform a qualitative assessment, a Step 1 impairment test will be performed. Management considered the qualitative factors and the evidence obtained and determined that it is not more likely than not that the fair value of the reporting units are less than their carrying amounts in either 2017 or 2018. Thus, no impairment was recorded in either year. The Linetec acquisition in 2018 (see further discussion in Note 19 – Business Acquisitions) was considered an asset purchase for tax purposes. As a result, goodwill associated with Linetec is expected to be deductible for those same purposes. (In thousands of dollars) Balance, December 31, 2016 Goodwill from Neuco acquisition Foreign currency translation adjustment Balance, December 31, 2017 Additional goodwill from Neuco acquisition Goodwill from Linetec acquisition Foreign currency translation adjustment Natural Gas Operations Utility Infrastructure Services Total Company $10,095 — — 10,095 — — — $129,888 32,028 7,303 $139,983 32,028 7,303 169,219 182 188,494 (8,945) 179,314 182 188,494 (8,945) Balance, December 31, 2018 $10,095 $348,950 $359,045 Other CurrentLiabilities. Management recognizes in its balance sheets various liabilities that are expected to be settled through future cash payment within the next twelve months, including certain regulatory liabilities (refer to Note 5 – Regulatory Assets and Liabilities), customary accrued expenses for employee compensation and benefits, and declared but unpaid dividends. As of December 31, 2018, this caption on the Company’s Consolidated Balance Sheet also included $75.6 million in unremitted amounts associated with the Linetec acquisition note above. 80 | SOUTHWEST GAS HOLDINGS, INC. Accumulated Removal Costs. Approved regulatory practices allow Southwest to include in depreciation expense a component intended to recover removal costs associated with utility plant retirements. In accordance with the Securities and Exchange Commission (“SEC”) position on presentation of these amounts, management reclassifies estimated removal costs from accumulated depreciation to accumulated removal costs within the liabilities section of the Consolidated Balance Sheets. Management regularly updates the estimated accumulated removal costs as amounts fluctuate between periods depending on the level of replacement work performed, the estimated cost of removal in rates, and the actual cost of removal experienced. Gas Operating Revenues. Southwest recognizes revenue when it satisfies its performance by transferring gas to the customer. Natural gas is delivered and “consumed” by the customer simultaneously. Revenues are recorded when customers are billed. Customer billings are substantially based on monthly meter reads and include certain other charges assessed monthly, and are calculated in accordance with applicable tariffs and state and local laws, regulations, and related agreements. An estimate of the margin associated with natural gas service provided, but not yet billed, to residential and commercial customers from the latest meter read date to the end of the reporting period is also recognized as accrued utility revenue. Revenues also include the net impacts of margin tracker/ decoupling accruals based on criteria in U.S. GAAP for rate-regulated entities associated with alternative revenue programs. All of Southwest’s service territories have decoupled rate structures, which are designed to eliminate the direct link between volumetric sales and revenue, thereby mitigating the impacts of unusual weather variability and conservation on margin. See Note 3 – Revenue for additional information regarding Gas operating revenues. Utility InfrastructureServicesRevenues. The majority of Centuri contracts are performed under unit-price contracts. Generally, these contracts state prices per unit of installation. Typical installations are accomplished in a few weeks or less. Revenues are recorded as installations are completed. Revenues are recorded for long-term fixed-price contracts in a pattern that reflects the transfer of control of promised goods and services to the customer over time. The amount of revenue recognized on fixed-price contracts is based on costs expended to date relative to anticipated final contract costs. Changes in job performance, job conditions, and final contract settlements are factors that influence management’s assessment of total contract value and the total estimated costs to complete those contracts. Revisions in estimates of costs and earnings during the course of work are reflected in the accounting period in which the facts requiring revision become known. If a loss on a contract becomes known or is anticipated, the entire amount of the estimated ultimate loss is recognized at that time in the financial statements. Some unit-price contracts contain caps that if encroached, trigger revenue and loss recognition similar to a fixed-price contract model. See Note 3 – Revenue for additional information regarding Utility infrastructure services revenues. Utility Infrastructure Services Expenses. Utility infrastructure services expenses in the Statements of Income includes payroll expenses, office and equipment rental costs, subcontractor expenses, training, job-related materials, gains and losses on equipment sales, and professional fees of Centuri. Net Cost of Gas Sold. Components of net cost of gas sold include natural gas commodity costs (fixed-price and variable-rate), pipeline capacity/transportation costs, and actual settled costs of natural gas derivative instruments. Also included are the net impacts of purchased gas adjustment (“PGA”) deferrals and recoveries, which by their inclusion, result in net cost of gas sold overall that is comparable to amounts included in billed gas operating revenues. Differences between amounts incurred with suppliers, transmission pipelines, etc. and those already included in customer rates, are temporarily deferred in PGA accounts pending inclusion in customer rates. OperationsandMaintenanceExpense. Operations and maintenance expense includes Southwest’s operating and maintenance costs associated with serving utility customers and maintaining its distribution and transmission systems, uncollectible expense, administrative and general salaries and expense, employee benefits expense excluding relevant non-service cost components (see Note 11 – Pension and Other Postretirement Benefits), and legal expense (including injuries and damages). SOUTHWEST GAS HOLDINGS, INC. | 81 Depreciation and Amortization. Utility plant depreciation is computed on the straight-line remaining life method at composite rates considered sufficient to amortize costs over estimated service lives, including components which compensate for removal costs (net of salvage value), and retirements, as approved by the appropriate regulatory agency. When plant is retired from service, the original cost of plant, including cost of removal, less salvage, is charged to the accumulated provision for depreciation. Other regulatory assets, including acquisition adjustments, are amortized when appropriate, over time periods authorized by regulators. See also discussion regarding Accumulated Removal Costs above. Non-utility and utility infrastructure services-related property and equipment are depreciated on a straight-line method based on the estimated useful lives of the related assets. Costs and gains related to refunding utility debt and debt issuance expenses are deferred and amortized over the weighted-average lives of the new issues and become a component of interest expense. AllowanceforFundsUsedDuringConstruction(“AFUDC”). AFUDC represents the cost of both debt and equity funds used to finance utility construction. AFUDC is capitalized as part of the cost of utility plant. The debt portion of AFUDC is reported in the Company’s and Southwest’s Consolidated Statements of Income as an offset to Net interest deductions and the equity portion is reported as Other income. Utility plant construction costs, including AFUDC, are recovered in authorized rates through depreciation when completed projects are placed into operation, and general rate relief is requested and granted. (In thousands) AFUDC: Debt portion Equity portion AFUDC capitalized as part of utility plant AFUDC rate 2018 2017 2016 $3,264 3,627 $1,666 2,296 $1,175 2,289 $6,891 $3,962 $3,464 5.85% 5.95% 7.35% Other Income (Deductions). The following table provides the composition of significant items included in Other income (deductions) on the Consolidated Statements of Income (thousands of dollars): Southwest Gas Corporation – natural gas operations segment: Increase (decrease) in COLI policies Interest income Equity AFUDC Non-service post-retirement benefit cost Miscellaneous income and (expense) Southwest Gas Corporation – total other income (deductions) Utility infrastructure services segment: Interest income Foreign transaction gain (loss) Equity in earnings of unconsolidated investment – Western Miscellaneous income and (expense) Centuri – total other income (deductions) Corporate and administrative 2018 2017 2016 $ (3,200) $ 10,300 2,784 2,296 (19,424) (2,344) 6,020 3,627 (21,059) (2,628) $ 7,400 1,848 2,289 (19,760) (3,261) (17,240) (6,388) (11,484) 88 (222) 531 (635) (238) 52 3 (754) 1,052 44 345 13 1 (22) 69 1,145 1,193 — Consolidated Southwest Gas Holdings, Inc. – total other income (deductions) $(17,426) $ (6,030) $(10,291) 82 | SOUTHWEST GAS HOLDINGS, INC. Included in the table above is the change in cash surrender values of company-owned life insurance (“COLI”) policies (including net death benefits recognized). These life insurance policies on members of management and other key employees are used by the Company and Southwest to indemnify against the loss of talent, expertise, and knowledge, as well as to provide indirect funding for certain nonqualified benefit plans. Current tax regulations provide for tax-free treatment of life insurance (death benefit) proceeds. Therefore, changes in the cash surrender value components of COLI policies, as they progress towards the ultimate death benefits, are also recorded without tax consequences. ForeignCurrencyTranslation. Foreign currency-denominated assets and liabilities of consolidated subsidiaries are translated into U.S. dollars at exchange rates existing at the respective balance sheet dates. Translation adjustments resulting from fluctuations in exchange rates are recorded as a separate component of accumulated other comprehensive income within stockholders’ equity. Results of operations of foreign subsidiaries are translated using the monthly weighted-average exchange rates during the respective periods. Gains and losses resulting from foreign currency transactions are included in Other income (expense) of the Company. Gains and losses resulting from intercompany foreign currency transactions that are of a long-term investment nature are reported in Other comprehensive income, if applicable. Earnings Per Share. Basic earnings per share (“EPS”) in each period of this report were calculated by dividing net income attributable to Southwest Gas Holdings, Inc. by the weighted-average number of shares during those periods. Diluted EPS includes additional weighted-average common stock equivalents (stock options, performance shares, and restricted stock units). Unless otherwise noted, the term “Earnings Per Share” refers to Basic EPS. A reconciliation of the denominator used in the Basic and Diluted EPS calculations is shown in the following table. (In thousands) Average basic shares Effect of dilutive securities: Stock options Management Incentive Plan shares Restricted stock units (1) Average diluted shares 2018 2017 2016 49,419 47,965 47,469 — 25 32 — 8 18 1 124 220 49,476 47,991 47,814 (1) The number of securities granted for 2018 and 2017 includes 23,000 and 7,000 performance shares, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period. RecentAccountingStandardsUpdates. Accounting pronouncements adopted in 2018: Effective January 2018, the Company and Southwest adopted the FASB update, Accounting Standards Codification (“ASC”) Topic 606 “Revenue from Contracts with Customers.” The update replaced much of the prior guidance regarding revenue recognition including most industry-specific guidance. See Note 3 – Revenue for more information regarding the adoption of the update. In January 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-02 “Income Statement – Reporting Comprehensive Income (Topic 220) – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The update addressed issues resulting from the enactment of the TCJA. Stakeholders raised a narrow-scope financial reporting issue that arose as a consequence of the TCJA related to the fact that when deferred tax balances were remeasured in SOUTHWEST GAS HOLDINGS, INC. | 83 December 2017, those deferred tax balances were to be reduced, but related amounts historically accumulated in Accumulated Other Comprehensive Income (“AOCI”) prior to the enactment of the TCJA, were required to be recognized as income tax expense rather than being relieved from AOCI. The amendments in this update allowed a reclassification from AOCI to retained earnings for those otherwise “stranded” tax effects in AOCI following enactment of the TCJA. The Company and Southwest adopted this update effective January 2018. Accordingly, approximately $9.3 million of previously stranded tax effects resulting from the TCJA were reclassified to retained earnings from AOCI on the Consolidated Balance Sheets of Southwest and the Company during the first quarter of 2018. In March 2017, the FASB issued ASU 2017-07 “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The new guidance related to the income statement presentation of net periodic benefit cost for an entity’s sponsored defined benefit pension and other postretirement plans. The Company and Southwest adopted this update effective January 2018. See Note 11 – Pension and Other Postretirement Benefits for additional information. Accounting pronouncements that will be effective in 2019: In February 2016, the FASB issued the update “Leases (Topic 842).” Under the update, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: • A lease liability for the obligation to make lease payments, measured on a discounted basis; and • A right-of-use asset for the right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Certain targeted improvements were made to align, where necessary, lessor accounting with the lessee accounting model and Topic 606, “Revenue from Contracts with Customers.” Though companies have historically been required to make disclosures regarding leases and associated contractual obligations, leases with terms longer than a year will no longer exist off-balance sheet. In July 2018, the FASB issued narrow-scope improvements to the standard, which include, among other things, guidance on lease classification reassessment and certain circumstances surrounding remeasurement. Also included was clarification that lessor-controlled options to terminate a lease are considered in the lease term. Management expects to elect various practical expedients and accounting policies regarding the transition method used to implement Topic 842. The Company and Southwest plan to elect the new optional transition method included within the recent FASB update “Leases – Targeted Improvements”, also issued in July 2018, which allows for comparative periods not to be restated. In conjunction with this decision, management currently expects that no retained earnings adjustment will be necessary due to the adoption of Topic 842. At a minimum, management expects the following regarding Topic 842 practical expedients and accounting policy elections: • To elect to use the “package”, which is a set of three practical expedients that must be elected as a package and applied consistently to all of the Company’s and Southwest’s leases. These include: not reassessing whether any expired or existing contracts are or contain leases; not reassessing the lease classification for expired or existing leases (that is, existing operating and capital leases in accordance with current lease guidance will in each case be classified as operating and finance leases, respectively, under the updated guidance); and not reassessing initial direct costs for any existing leases. • To elect to adopt the practical expedient to exclude all easements in place prior to January 1, 2019 from treatment under Topic 842. However, the Company and Southwest will evaluate any new easements entered into after the effective date of the standard to determine if the arrangements should be accounted for as leases. • To make an accounting policy election by asset class to include both the lease and non-lease components (as defined in the guidance) as a single component. • To make an accounting policy election to not apply Topic 842 to short-term leases, as permitted. 84 | SOUTHWEST GAS HOLDINGS, INC. • To not elect to use hindsight in determining the lease term and in assessing impairment of right-of-use assets. Southwest’s leases are comprised primarily of operating leases of buildings, land, and equipment. At this time, Southwest has no finance leases. Centuri leases buildings, land, fleet equipment, and other equipment. The majority of Centuri’s leases are operating leases. The Company and Southwest are currently not the lessor in any significant lease arrangements. Management has implemented new software systems (one for Southwest and one for Centuri) to facilitate compliance with Topic 842. Management will adopt the update in the first quarter of 2019, as required. Management is finalizing its evaluation of the impact of the adoption on the consolidated financial statements and related disclosures. Recently issued accounting pronouncements that will be effective after 2019: In June 2016, the FASB issued ASU 2016-13 update “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The update requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The inputs currently used to estimate credit losses will still be used, however they may be adapted to reflect the full amount of expected losses. The update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. All entities may adopt the amendments in this update earlier as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Management is evaluating what impact, if any, this update might have on the Company’s and Southwest’s consolidated financial statements and disclosures. In January 2017, the FASB issued ASU 2017-04 “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” Currently, unless meeting the criteria for qualitative assessment only, an entity is required to perform a two-step test to determine the amount, if any, of goodwill impairment. In Step 1, an entity compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity performs Step 2 and compares the implied fair value of goodwill with the carrying amount of that goodwill for that reporting unit. An impairment charge equal to the amount by which the carrying amount of goodwill for the reporting unit exceeds the implied fair value of that goodwill is recorded, limited to the amount of goodwill allocated to that reporting unit. Under the update, an entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. The amount of any goodwill impairment calculated under the update could vary from the calculation under the existing guidance. The amendments should be applied on a prospective basis. The update is effective for fiscal and interim periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. Management is evaluating the impacts this update might have on the Company’s and Southwest’s consolidated financial statements and disclosures. In August 2018, the FASB issued ASU 2018-15 “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” The update generally aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement (that is a service contract) with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The update also requires the entity to expense the capitalized implementation costs of such hosting arrangements over the term of the hosting arrangement, including reasonably certain renewal periods. The update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption of the amendments in this update is permitted for interim and related annual fiscal periods after December 15, 2018. Management is evaluating the impacts this update might have on the Company’s and Southwest’s consolidated financial statements and disclosures. SOUTHWEST GAS HOLDINGS, INC. | 85 In August 2018, the FASB issued ASU 2018-14 “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” This update removes disclosures that are no longer considered cost-beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant. The update applies to all employers that sponsor defined benefit pension or other post-retirement plans. The update is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. Management is evaluating the impacts this update might have on its disclosures. In August 2018, the FASB issued ASU 2018-13 “Fair Value Measurement: Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” The update is intended to improve the effectiveness of fair value measurement disclosures and removes the following disclosure requirements: the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of transfers between levels; and the valuation processes for Level 3 fair value measurements. The update also modifies or clarifies for investments in certain entities that calculate net asset value, a requirement to disclose the timing of liquidation of an investee’s assets and the date when restrictions from redemption might lapse (in cases when the timing has been communicated or announced publicly). It also clarifies communication requirements about measurement uncertainty as of the reporting date. For certain unobservable inputs, an entity may disclose other quantitative information in lieu of the weighted average if it would be a more reasonable and rational method to reflect the distribution of inputs to the measurements. Management is evaluating the impacts this update might have on its disclosures. SubsequentEvents. Management monitors 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 or disclosures to be made, and has reflected them where appropriate. Note 2 – Utility Plant and Leases Net utility plant as of December 31, 2018 and 2017 was as follows (thousands of dollars): December 31, Gas plant: Storage Transmission Distribution General Software and software-related intangibles Other Less: accumulated depreciation and amortization Construction work in progress Net utility plant 2018 2017 $ 26,825 386,159 6,049,380 416,643 241,158 14,074 $ 25,019 363,396 5,600,769 396,252 230,030 14,178 7,134,239 (2,234,029) 193,028 6,629,644 (2,231,242) 125,248 $ 5,093,238 $ 4,523,650 Utility plant depreciation is computed on the straight-line remaining life method at composite rates considered sufficient to amortize costs over estimated service lives, including components which are intended to compensate for removal costs (net of salvage value), and retirements, based on the processes of regulatory proceedings and related regulatory commission approvals and/or mandates. In 2018, annual utility depreciation and amortization expense averaged 2.7% of the original cost of depreciable and amortizable property. Average rates in 2017 and 2016 approximated 3.0%. Transmission and Distribution plant (combined), associated with core natural gas delivery infrastructure, constitute the majority of gas plant. Annual utility depreciation expense averaged approximately 3.0% of original cost of depreciable transmission and distribution plant during the period 2016 through 2018. 86 | SOUTHWEST GAS HOLDINGS, INC. Depreciation and amortization expense on gas plant, including intangibles, was as follows (thousands of dollars): Depreciation and amortization expense 2018 2017 2016 $185,719 $187,075 $214,037 Included in the figures above is amortization of utility intangibles of $13.6 million in 2018, $14.3 million in 2017, and $14.8 million in 2016. Additionally, the amounts above exclude regulatory asset and liability amortization. OperatingLeasesandRentals. Certain land, buildings, and construction equipment is leased. The majority of these leases are short- term and accounted for as operating leases. For the natural gas operations segment, these leases are also treated as operating leases for regulatory purposes. Centuri has various short-term operating leases of equipment and temporary office sites. The table below presents Southwest’s and Centuri’s rental and lease payments that are included in operating expenses (in thousands): Southwest Gas Corporation Centuri Consolidated rental payments/lease expense 2018 2017 2016 $ 4,556 59,491 $ 4,926 62,310 $ 4,357 53,956 $64,047 $67,236 $58,313 The following is a schedule of future minimum lease payments for operating leases (with initial or remaining terms in excess of one year) as of December 31, 2018 (thousands of dollars): 2019 2020 2021 2022 2023 Thereafter Total minimum lease payments Southwest Centuri Consolidated Total $ 898 363 299 163 79 177 $ $10,053 7,656 5,760 5,163 3,681 10,511 $1,979 $42,824 $ 10,951 8,019 6,059 5,326 3,760 10,688 44,803 CapitalLeases. Centuri leases certain construction equipment under capital leases arrangements which are not significant. Note 3 – Revenue Effective January 2018, the Company and Southwest adopted the FASB’s Topic 606, “Revenue from Contracts with Customers”, using the modified retrospective transition method. Under the modified retrospective approach, the information for periods prior to the adoption date has not been restated and continues to be reported under the accounting standards in effect for those periods (Topic 605, “Revenue Recognition”). As permitted under the standard, the Company and Southwest have elected to apply the guidance retrospectively only to those contracts that were not completed at January 1, 2018. Management assessed the effects the new guidance has on the Company’s (and Southwest’s, in the case of natural gas operations) financial position, results of operations, and cash flows. Based on these assessments, the adoption of Topic 606 had no material impact on any of the financial statements of Southwest or the Company. Certain disclosures included within this note reflect information for 2017 and 2016, during which periods the Company and Southwest followed the guidance in Topic 605. As there were no material changes to the consolidated financial statements as a result of the adoption of Topic 606, as noted above, management elected to disclose information for 2017 SOUTHWEST GAS HOLDINGS, INC. | 87 and 2016, as the manner in which revenue is recorded has not changed and believes that including such disclosure provides useful information. The following information about the Company’s revenues is presented by segment. Southwest encompasses one segment – natural gas operations. Natural Gas Operations Segment: Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Public utility rates, practices, facilities, and service territories of Southwest are subject to regulatory oversight. Southwest recognizes revenue when it satisfies its performance by transferring gas to the customer. Revenues also include the net impacts of margin tracker/decoupling accruals based on criteria in U.S. GAAP for rate-regulated entities associated with alternative revenue programs. Revenues from customer arrangements and from alternative revenue programs are described below. Southwest acts as an agent for state and local taxing authorities in the collection and remittance of a variety of taxes, including sales and use taxes and surcharges. These taxes are not included in Gas operating revenues. Management uses the net classification method to report taxes collected from customers to be remitted to governmental authorities. Southwest generally offers two types of services to its customers: tariff sales and transportation–only service. Tariff sales encompass sales to many types of customers (primarily residential) under various rate schedules, subject to cost-of-service ratemaking, which is based on the rate-regulation of state commissions and the Federal Energy Regulatory Commission (the “FERC”). Southwest provides both the commodity and the related distribution service to nearly all of its approximate 2 million customers, and only several hundred customers (who are eligible to secure their own gas) subscribe to transportation-only service. Also, only a few hundred customers have contracts with stated periods. Southwest recognizes revenue when it satisfies its performance requirement by transferring volumes of gas to the customer. Natural gas is delivered and consumed by the customer simultaneously. The provision of service is represented by the turn of the meter dial and is the primary representation of the satisfaction of performance obligations of Southwest. The amount billable via regulated rates (both volumetric and fixed monthly rates as part of rate design) corresponds to the value to the customer, and management believes that the amount billable under the “invoice practical expedient” (amount Southwest has the right to invoice) is appropriate to utilize for purposes of recognizing revenue. Estimated amounts remaining unbilled since the last meter read date are restricted from being billed due only to the passage of time and therefore are also recognized for service provided through the balance sheet date. While natural gas service is typically recurring, there is generally not a contract term for utility service. Therefore, the contract term is not generally viewed to extend beyond the service provided to date, and customers can generally terminate service at will. Transportation-only service is also governed by tariff rate provisions. Transportation-only service is generally only available to very large customers under requirements of Southwest’s various tariffs. With this service, customers secure their own gas supply and Southwest provides transportation services to move the customer-supplied gas to the intended location. Southwest concluded that transportation/transmission service is suitable to an “over time” model. Rate structures under Southwest’s regulation for transportation customers include a combination of volumetric charges and monthly “fixed” charges (including charges commonly referred to as capacity charges, demand charges, or reservation charges) as part of the rate design of regulated jurisdictions. These types of fixed charges represent a separate performance obligation associated with standing ready over the period of the month to deliver quantities of gas, regardless of whether the customer takes delivery of any quantity of gas. The performance obligations under these circumstances are satisfied over the course of the month under an output measure of progress based on time, which correlates to the period for which the charges are eligible to be invoiced. 88 | SOUTHWEST GAS HOLDINGS, INC. Under its regulation, Southwest enters into negotiated rate contracts for those customers located in proximity to another pipeline, which pose a threat of bypassing its distribution system. Southwest may also enter into similar contracts for customers otherwise able to satisfy their energy needs by means of alternative fuel to natural gas. Less than two dozen customers are party to contracts with rate components subject to negotiation. Many rate provisions and terms of service for these less common types of contracts are also subject to regulatory oversight and tariff provisions. The performance obligations for these customers are satisfied similarly to those for other customers by means of transporting/delivering natural gas to the customer. Many or most of the rate components, and structures, for these types of customers are the same as those for similar customers without negotiated rate components; and the negotiated rates are within the parameters of the tariff guidelines. Management determined that these arrangements qualify for the invoice practical expedient for recognizing revenue. Furthermore, while some of these contracts include contract periods extending over time, including multiple years, as amounts billable under the contract are based on rates in effect for the customer for service provided to date, no significant financing component is deemed to exist. As indicated above, revenues also include the net impacts of margin tracker/decoupling accruals. All of Southwest’s service territories have decoupled rate structures (also referred to as alternative revenue programs) that are designed to eliminate the direct link between volumetric sales and revenue, thereby mitigating the impacts of unusual weather variability and conservation on margin. The primary alternative revenue programs involve permissible adjustments for differences between stated tariff benchmarks and amounts billable through revenue from contracts with customers via existing rates. Such adjustments are recognized monthly in revenue and in the associated regulatory asset/liability accounts in advance of rate adjustments intended to collect or return amounts recognized. Revenues recognized for the adjustment to the benchmarks noted are required to be presented separately from revenues from contracts with customers, and as such, are provided below and identified as alternative revenue program revenue (which excludes recoveries from customers). Gas operating revenues on the Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below disaggregated by customer type, and various categories of revenue: (Thousands of dollars) Residential Small commercial Large commercial Industrial/other Transportation Revenue from contracts with customers Alternative revenue program revenues (deferrals) Other revenues (a) Total Gas operating revenues 2018 $ 887,220 255,083 53,192 23,489 86,990 1,305,974 45,979 5,775 December 31, 2017 $ 857,204 243,513 52,379 22,026 87,759 1,262,881 35,347 4,080 2016 $ 895,330 251,092 53,582 19,753 87,106 1,306,863 12,530 2,019 $1,357,728 $1,302,308 $1,321,412 (a) Includes various other revenues, and during the first six months of 2018, included $12.5 million as a reserve against revenue associated with a tax reform savings adjustment. During the third quarter of 2018, amounts previously recognized were reclassified to the various categories of revenue from contracts with customers when incorporated in tariff rates. Utility Infrastructure Services Segment: The majority of Centuri contracts are performed under unit-price contracts. Generally, these contracts state prices per unit of installation. Typical installations are accomplished in a few weeks or less. Revenues are recorded as installations are completed. SOUTHWEST GAS HOLDINGS, INC. | 89 Revenues are recorded for long-term fixed-price contracts in a pattern that reflects the transfer of control of promised goods and services to the customer over time. The amount of revenue recognized on fixed-price contracts is based on costs expended to date relative to anticipated final contract costs (a method of recognition based on inputs). Some unit-price contracts contain caps that if encroached, trigger revenue and loss recognition similar to a fixed-price contract model. Centuri is required to collect taxes imposed by various governmental agencies on the work performed for its customers. These taxes are not included in Utility infrastructure services revenues. Management uses the net classification method to report taxes collected from customers to be remitted to governmental authorities. Centuri derives revenue from the installation, replacement, repair, and maintenance of energy distribution systems, and in developing industrial construction solutions. Centuri has operations in the U.S. and Canada. The majority of Centuri’s revenues are related to contracts for natural gas pipeline replacement and installation work for natural gas utilities. In addition, Centuri performs certain industrial construction activities for various customers and industries. Centuri has two types of agreements with its customers: master services agreements (“MSAs”) and bid contracts. Most of Centuri’s customers supply many of their own materials in order for Centuri to complete its work under the contracts. An MSA identifies most of the terms describing each party’s rights and obligations that will govern future work authorizations. An MSA is often effective for multiple years. A work authorization is issued by the customer to describe the location, timing, and any additional information necessary to complete the work for the customer. The combination of the MSA and the work authorization determines when a contract exists and revenue recognition may begin. Each work authorization is generally a single performance obligation as Centuri is performing a significant integration service. Centuri has elected to use the portfolio method practical expedient at the customer level as the terms and conditions of the work performed under MSAs are similar in nature with each customer but vary significantly between customers. A bid contract is typically a one-time agreement for a specific project that has all necessary terms defining each party’s rights and obligations. Each bid contract is evaluated for revenue recognition individually. Control of assets created under bid contracts generally passes to the customer over time. Bid contracts often have a single performance obligation as Centuri is providing a significant integration service. Centuri’s MSA and bid contracts are characterized as either fixed-price contracts or unit-price contracts for revenue recognition purposes. The cost-to-cost input method is used to measure progress towards the satisfaction of a performance obligation for fixed- price contracts. Input methods result in the recognition of revenue based on the entity’s expended effort to satisfy the performance obligation relative to the total expected effort to satisfy the performance obligation. For unit-price contracts, an output method is used to measure progress towards satisfaction of a performance obligation. Also with regard to unit-price contracts, the output measurement will be the completion of each unit that is required under the contract. Actual revenues and project costs can vary, sometimes substantially, from previous estimates due to changes in a variety of factors, including unforeseen circumstances. These factors, along with other risks inherent in performing fixed-price contracts may cause actual revenues and gross profit for a project to differ from previous estimates and could result in reduced profitability or losses on projects. Changes in these factors may result in revisions to costs and earnings, the impacts for which are recognized in the period in which the changes are identified. Once identified, these types of conditions continue to be evaluated for each project throughout the project term and ongoing revisions in management’s estimates of contract value, contract cost, and contract profit are recognized as necessary in the period determined. Centuri categorizes work performed under MSAs and bid contracts into three primary service types: gas construction, electrical construction, and other construction. Gas construction includes work involving previously existing gas pipelines and the installation 90 | SOUTHWEST GAS HOLDINGS, INC. of new pipelines or service lines. Electrical construction includes work involving installation and maintenance of transmission and distribution lines and storm restoration services. Other construction includes all other work and can include industrial and water utility services. Contracts can have compensation/consideration that is variable. For MSAs, variable consideration is evaluated at the customer level as the terms creating variability in pricing are included within the MSA and are not specific to a work authorization. For multi-year MSAs, variable consideration items are typically determined for each year of the contract and not for the full contract term. For bid contracts, variable consideration is evaluated at the individual contract level. The expected value method or most likely amount method is used based on the nature of the variable consideration. Types of variable consideration include liquidated damages, delay penalties, performance incentives, safety bonuses, payment discounts, and volume rebates. Centuri will typically estimate variable consideration and adjust financial information, as necessary. Change orders involve the modification in scope, price, or both to the current contract, requiring approval by both parties. The existing terms of the contract continue to be accounted for under the current contract until such time as a change order is approved. Once approved, the change order is either treated as a separate contract or as part of the existing contract, as appropriate, under the circumstances. When the scope is agreed upon in the change order but not the price, Centuri estimates the change to the transaction price. The following tables display Centuri’s revenue from contracts with customers disaggregated by service type and contract type: (Thousands of dollars) Service Types: Gas infrastructure services Electric power infrastructure services Other Total Utility infrastructure services revenues (Thousands of dollars) Contract Types: Master services agreement Bid contract Total Utility infrastructure services revenues Unit priced contracts Fixed priced contracts Time and materials contracts Total Utility infrastructure services revenues 2018 December 31, 2017 2016 $ $ 1,123,682 32,629 365,974 $ 891,139 18,114 337,231 914,970 27,915 196,193 $ 1,522,285 $ 1,246,484 $ 1,139,078 2018 December 31, 2017 2016 $ $ $ $ $ $ 1,102,412 419,873 1,522,285 1,258,419 117,298 146,568 $ $ $ 885,513 360,971 1,246,484 968,856 127,497 150,131 852,472 286,606 1,139,078 886,919 95,494 156,665 $ 1,522,285 $ 1,246,484 $ 1,139,078 The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract assets), both of which are included within Accounts receivable, net of allowances, and amounts billed in excess of revenue SOUTHWEST GAS HOLDINGS, INC. | 91 earned on contracts (contract liabilities), which are included in Other current liabilities as of December 31, 2018 and December 31, 2017 on the Company’s Consolidated Balance Sheets: (Thousands of dollars) Contracts receivable, net Revenue earned on contracts in progress in excess of billings Amounts billed in excess of revenue earned on contracts December 31, 2018 December 31, 2017 $186,249 87,520 4,211 $221,859 5,768 9,602 The revenue earned on contracts in progress in excess of billings (contract asset) primarily relates to Centuri’s rights to consideration for work completed but not billed and/or approved at the reporting date. These contract assets are transferred to contracts receivable when the rights become unconditional. Upon adoption of Topic 606, the Company reclassified $50.6 million to revenue earned on contracts in progress in excess of billings, and during the year ended December 31, 2018, recognized an increase of $30 million, excluding the impact from the adoption, primarily related to normal operating and billing activities. The amounts billed in excess of revenue earned (contract liability) primarily relate to the advance consideration received from customers for which work has not yet been completed. The change in this contract liability balance from January 1, 2018 to December 31, 2018 is due to revenue recognized of $9.6 million that was included in this balance as of January 1, 2018, after which time it became earned and the balance was reduced, and to increases due to cash received, net of revenue recognized during the period related to contracts that commenced during the period. Prior to the adoption of Topic 606, revenue earned on contracts in progress in excess of billings was only used to recognize contract assets related to fixed-price contracts under previous accounting guidance. This balance now includes any conditional contract assets for both fixed-price contracts and unit-price contracts. Centuri considers retention and unbilled amounts to be conditional contract assets, as payment is contingent on the occurrence of a future event. Contracts receivable, net, includes only amounts that are unconditional in nature, which means only the passage of time remains and Centuri has invoiced the customer. Similarly, amounts billed in excess of revenue earned on contracts was only used to recognize contract liabilities related to fixed-price contracts under previous accounting guidance. This line item now includes contract liabilities related to both fixed-price contracts and unit-price contracts. In the event a contract asset or contract liability is expected to be recognized for greater than one year from the financial statement date, Centuri classifies those amounts as long-term contract assets or contract liabilities, included in Deferred charges and other assets or Other deferred credits and other long-term liabilities on the Company’s Consolidated Balance Sheets. For contracts that have an original duration of one year or less, Centuri uses the practical expedient applicable to such contracts and does not consider/compute an interest component based on the time value of money. Further, because of the short duration of these contracts, the Company has not disclosed the transaction price for the remaining performance obligations as of the end of each reporting period or when the Company expects to recognize the revenue. As of December 31, 2018, Centuri has fifteen contracts that had an original duration of more than one year. The aggregate amount of the transaction price allocated to the unsatisfied performance obligations of these contracts as of December 31, 2018 is $38.6 million. Centuri expects to recognize the remaining performance obligations over the next four years; however, the timing of that recognition is largely within the control of the customer, including when the necessary equipment and materials required to complete the work will be provided by the customer. 92 | SOUTHWEST GAS HOLDINGS, INC. Utility infrastructure services contracts receivable consists of the following: (Thousands of dollars) December 31, 2018 December 31, 2017 Billed on completed contracts and contracts in progress Other receivables Contracts receivable, gross Allowance for doubtful accounts Contracts receivable, net $184,100 2,588 186,688 (439) $186,249 $219,298 2,622 221,920 (61) $221,859 Note 4 – Receivables and Related Allowances Business activity with respect to gas utility operations is conducted with customers located within the three-state region of Arizona, Nevada, and California. The table below contains information about the gas utility customer accounts receivable balance (net of allowance) at December 31, 2018 and 2017, and the percentage of customers in each of the three states, which was consistent with the prior year. Gas utility customer accounts receivable balance (in thousands) $138,149 $119,444 December 31, 2018 December 31, 2017 Percent of customers by state Arizona Nevada California December 31, 2018 53% 37% 10% SOUTHWEST GAS HOLDINGS, INC. | 93 Although Southwest seeks to minimize its credit risk related to utility operations by requiring security deposits from new customers, imposing late fees, and actively pursuing collection on overdue accounts, some accounts are ultimately not collected. Customer accounts are subject to collection procedures that vary by jurisdiction (late fee assessment, noticing requirements for disconnection of service, and procedures for actual disconnection and/or reestablishment of service). After disconnection of service, accounts are generally written off approximately two months after inactivation. Dependent upon the jurisdiction, reestablishment of service requires both payment of previously unpaid balances and additional deposit requirements. Provisions for uncollectible accounts are recorded monthly based on experience, customer and rate composition, and write-off processes. They are included in the ratemaking process as a cost of service. The Nevada jurisdictions have a regulatory mechanism associated with the gas cost-related portion of uncollectible accounts. Such amounts are deferred and collected through a surcharge in the ratemaking process. Activity in the allowance account for uncollectibles is summarized as follows (thousands of dollars): Balance, December 31, 2015 Additions charged to expense Accounts written off, less recoveries Balance, December 31, 2016 Additions charged to expense Accounts written off, less recoveries Balance, December 31, 2017 Additions charged to expense Accounts written off, less recoveries Balance, December 31, 2018 Allowance for Uncollectibles $ 2,270 3,264 (3,010) 2,524 2,310 (2,723) 2,111 2,959 (2,902) $ 2,168 At December 31, 2018, the utility infrastructure services segment (Centuri) had $273.8 million in combined customer accounts and contracts receivable. Both the allowance for uncollectibles and write-offs related to Centuri customers have been insignificant and are not reflected in the table above. Note 5 – Regulatory Assets and Liabilities Southwest is subject to the regulation of the Arizona Corporation Commission (“ACC”), the Public Utilities Commission of Nevada (“PUCN”), the California Public Utilities Commission (“CPUC”), and the FERC. Accounting policies of Southwest conform to U.S. GAAP applicable to rate-regulated entities and reflect the effects of the ratemaking process. Accounting treatment for rate- regulated entities allows for deferral as regulatory assets, costs that otherwise would be expensed, if it is probable that future recovery from customers will occur. If rate recovery is no longer probable, due to competition or the actions of regulators, Southwest is required to write-off the related regulatory asset. Regulatory liabilities are recorded if it is probable that revenues will be reduced for amounts that will be credited to customers through the ratemaking process. 94 | SOUTHWEST GAS HOLDINGS, INC. The following table represents existing regulatory assets and liabilities (thousands of dollars): December 31, Regulatory assets: Accrued pension and other postretirement benefit costs (1) Unrealized net loss on non-trading derivatives (Swaps) (2) Deferred purchased gas costs (3) Accrued purchased gas costs (4) Unamortized premium on reacquired debt (5) Accrued absence time (8) Margin & interest-tracking (9) Other (10) Regulatory liabilities: Deferred purchased gas costs (3) Accumulated removal costs Unrealized net gain on non-trading derivatives (Swaps) (2) Unamortized gain on reacquired debt (6) Regulatory excess deferred taxes and gross-up (7) Other (10) Net regulatory liabilities 2018 2017 $ 383,170 1,862 4,928 29,000 19,599 14,126 88,290 32,616 $ 391,403 5,780 14,581 17,000 20,913 13,870 42,354 25,997 573,591 531,898 (79,762) (383,000) (144) (8,717) (458,834) (19,911) (6,841) (315,000) — (9,253) (433,908) (33,184) $(376,777) $(266,288) (1) Included in Deferred charges and other assets on the Consolidated Balance Sheets. Recovery period is greater than five years. (See Note 11 – Pension and Other Postretirement Benefits). (2) Asset balance is included in Deferred charges and other assets and Prepaid and other assets on the Consolidated Balance Sheets. Liability balance is included in Other current liabilities and Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. The actual amounts, when realized at settlement, become a component of purchased gas costs under Southwest’s PGA mechanisms. (For specific details, see Note 14 – Derivatives). (3) Balance recovered or refunded on an ongoing basis with interest. (4) (5) (6) Included in Prepaid and other current assets on the Consolidated Balance Sheets. Balance recovered or refunded on an ongoing basis. Included in Deferred charges and other assets on the Consolidated Balance Sheets. Recovered over life of debt instruments. Included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. Amortized over life of debt instruments. (7) The TCJA required a remeasurement and reduction of the net deferred income tax liability. The reduction (excess deferred taxes) became a regulatory liability with appropriate tax gross-up. The excess deferred taxes reduce rate base. The tax benefit will be returned to utility customers in accordance with regulatory requirements. Included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. This amount also includes a $2.9 million gross-up related to contributions in aid of construction. (8) Regulatory recovery occurs on a one-year lag basis through the labor loading process. Included in Prepaid and other current assets on the Consolidated Balance Sheets. (9) Margin tracking/decoupling mechanisms are alternative revenue programs and revenue associated with under-collections (for the difference between authorized margin levels and amounts billed to customers through rates currently) are recognized as revenue so long as recovery is expected to take place within 24 months. Included in Prepaid and other current assets on the Consolidated Balance Sheets. (10) The following tables detail the components of Other regulatory assets and liabilities. Other regulatory assets are included in either Prepaid and other current assets or Deferred charges and other assets on the Consolidated Balance Sheets (as indicated). Recovery periods vary. Other SOUTHWEST GAS HOLDINGS, INC. | 95 regulatory liabilities are included in either Other current liabilities or Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets (as indicated). Other Regulatory Assets State mandated public purpose programs (including low income and conservation programs) (a) (e) Infrastructure replacement programs and similar (b) (e) Environmental compliance programs (c) (e) Other (d) 2018 2017 $ 6,253 12,486 5,046 8,831 $ 4,832 9,627 9,702 1,836 $32,616 $25,997 a) Included in Prepaid and other current assets on the Consolidated Balance Sheets. See Prepaid and other current assets in Note 1 – b) c) Background, Organization, and Summary of Significant Accounting Policies. Included in Deferred charges and other assets on the Consolidated Balance Sheets. In 2018, approximately $4.5 million included in Prepaid and other current assets and $596,000 included in Deferred charges and other assets on the Consolidated Balance Sheets. In2017, $9.2 million included in Prepaid and other current assets and $527,000 included in Deferred charges and other assets on the Consolidated Balance Sheets. d) In 2018, $197,000 included in Prepaid and other current assets and $8.6 million included in Deferred charges and other assets on the Consolidated Balance Sheets. In 2017, $531,000 included in Prepaid and other current assets and $1.3 million included in Deferred charges and other assets on the Consolidated Balance Sheets. The balance in 2018 includes $6 million authorized as part of the recently concluded Nevada general rate case associated with self-insurance cost. e) Balance recovered or refunded on an ongoing basis, generally with interest. Other Regulatory Liabilities State mandated public purpose programs (including low income and conservation programs) (a) (e) Margin, interest- and property tax-tracking accounts (b) (e) Environmental compliance programs (e) (f) Regulatory accounts for differences related to pension funding (c) Other (d) (e) 2018 2017 $ (8,598) $(10,213) (9,505) (8,574) (3,178) (1,714) (7,273) — (3,221) (819) $(19,911) $(33,184) a) b) c) d) e) f) Included in Other current liabilities on the Consolidated Balance Sheets. In 2018, $(539,000) included in Other current liabilities and $(6.7) million included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. In 2017, $(6.6) million included in Other current liabilities and $(2.9) million included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. Included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. In 2018, $(810,000) included in Other current liabilities and $(9,000) included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. In 2017, approximately $(1.7) million included in Other current liabilities and $(9,000) included in Other deferred credits and other long-term liabilities on the Consolidated Balance Sheets. Balance recovered or refunded on an ongoing basis, generally with interest. In 2018, included in Prepaid and other current assets on the Consolidated Balance Sheets. In 2017, included in Other current liabilities on the Consolidated Balance Sheets. 96 | SOUTHWEST GAS HOLDINGS, INC. Note 6 – Other Comprehensive Income and Accumulated Other Comprehensive Income (“AOCI”) The following information provides insight into amounts impacting Other Comprehensive Income (Loss), both before and after-tax, within the Consolidated Statements of Comprehensive Income, which also impact Accumulated Other Comprehensive Income in the Consolidated Balance Sheets and Consolidated Statements of Equity of the Company and Southwest. Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Thousands of dollars) 2018 Tax (Expense) or Benefit (1) Before- Tax Amount Net-of- Tax Amount Before- Tax Amount 2017 Tax (Expense) or Benefit (1) Net-of- Tax Amount Before- Tax Amount 2016 Tax (Expense) or Benefit (1) Net-of- Tax Amount Defined benefit pension plans: Net actuarial gain/(loss) Amortization of prior service cost Amortization of net actuarial (gain)/loss Regulatory adjustment Pension plans other comprehensive income (loss) FSIRS (designated hedging activities): Amounts reclassified into net income FSIRS other comprehensive income (loss) Total other comprehensive income (loss) – South- west Gas Corporation Foreign currency translation adjustments: Translation adjustments Foreign currency other comprehensive income (loss) Total other comprehensive income (loss) – South- $(20,426) $ 4,902 $(15,524)$(43,027) $10,326 $(32,701)$(22,770) $ 8,652 $(14,118) 828 16,781 (3,462) 29 1,335 1,015 25,549 25,445 (6,257) 12,340 (3,907) 4,783 (507) (10,285) 2,122 (18) 828 15,776 12,590 (3,507) 1,335 33,617 (8,233) 6,293 1,335 27,066 (5,584) 47 (320) (8,068) 1,976 (1,510) (507) (9,669) 250 400 3,345 3,345 (804) (804) 2,541 2,541 3,344 3,344 (1,271) (1,271) 2,073 2,073 3,345 3,345 (1,270) (1,270) 2,075 2,075 9,638 (2,314) 7,324 (563) (871) (1,434) 3,392 (1,288) 2,104 (3,010) (3,010) — (3,010) — (3,010) 1,771 1,771 — — 1,771 1,771 161 161 — — 161 161 west Gas Holdings, Inc. $ 6,628 $(2,314) $ 4,314 $ 1,208 $ (871) $ 337 $ 3,553 $ (1,288) $ 2,265 (1) Tax amounts are calculated using a 24% rate following the December 22, 2017 enactment date of the TCJA. For periods prior to the enactment date, tax amounts were calculated using a 38% rate. At December 31, 2017, excess taxes related to pre-tax amounts which accumulated in AOCI prior to tax reform were required to remain in the account until the first quarter of 2018, when ASU 2018-02 was adopted, permitting previously stranded amounts to be released from AOCI and applied to Retained earnings (see table for Accumulated other comprehensive income (loss), including the balance, below). With regard to foreign currency translation adjustments, the Company has elected to indefinitely reinvest the earnings of Centuri’s Canadian subsidiaries in Canada, thus preventing deferred taxes on such earnings. As a result of this assertion, the Company is not recognizing any tax effect or presenting a tax expense or benefit for the currency translation adjustment amount reported in Other comprehensive income (loss), as repatriation of earnings is not anticipated. With regard to the table above and the roll-forward tables below, management recognizes tax impacts (associated with underlying before-tax amounts in AOCI) in both AOCI and in Deferred income taxes and investment tax credits, net on its balance sheets. U.S. tax reform of the TCJA was enacted on December 22, 2017. U.S. GAAP requires that deferred tax assets and liabilities be adjusted to reflect the effects of a change in tax laws and rates, and also requires that the effect be included in income from continuing operations for the period of enactment. As a result, when deferred tax balances on the balance sheet for the period ending December 31, 2017 were remeasured as a result of the TCJA to reflect the change in enacted rates, those adjustments were also reflected in income tax expense on the Consolidated Statements of Income, as required. However, excess amounts were not able to be released from AOCI until the first quarter of 2018, when upon adoption of ASU 2018-02, previously stranded amounts were released and reflected in Retained earnings on Southwest’s and the Company’s Consolidated Balance Sheets, as required by the ASU. SOUTHWEST GAS HOLDINGS, INC. | 97 The estimated amounts that will be amortized from accumulated other comprehensive income or regulatory assets into net periodic benefit cost over the next year are summarized below (in thousands): Retirement plan net actuarial loss SERP net actuarial loss PBOP prior service cost $22,000 1,000 1,300 Approximately $2.5 million of realized losses (net of tax) related to the FSIRS, included in AOCI at December 31, 2018, will be reclassified into interest expense within the next twelve months as the related interest payments on long-term debt occur. The following table represents a rollforward of AOCI, presented on the Company’s Consolidated Balance Sheets and its Consolidated Statements of Equity: AOCI—Rollforward (Thousands of dollars) Beginning Balance AOCI December 31, 2017 Net actuarial gain/(loss) Translation adjustments Other comprehensive income before reclassifications FSIRS amounts reclassified from AOCI (1) Amortization of prior service cost (2) Amortization of net actuarial loss (2) Regulatory adjustment (3) Net current period other comprehensive income (loss) attribut- able to Southwest Gas Holdings, Inc. Defined Benefit Plans FSIRS Foreign Currency Items Tax (Expense) Benefit (5) After-Tax Before- Tax Tax (Expense) Benefit (5) After-Tax Before- Tax Before-Tax Tax (Expense) Benefit After-Tax Other AOCI $(61,520) $22,293 $(39,227)$(12,655) $4,809 $(7,846) $ (609) $— $ (609) $ — $(47,682) (20,426) — 4,902 — (15,524) — (20,426) 4,902 (15,524) — — — — — — — — — — (3,010) — — (3,010) — (15,524) — (3,010) — (3,010) — (3,010) — (18,534) — 1,335 33,617 (8,233) — (320) (8,068) 1,976 — 3,345 — — — 1,015 25,549 (6,257) (804) — — — 2,541 — — — — — — — — — — — — — — — — 2,541 — 1,015 — 25,549 — (6,257) 6,293 (1,510) 4,783 3,345 (804) 2,541 (3,010) — (3,010) — 4,314 Reclassification of excess deferred taxes (4) — — — — — — — — — (9,300) (9,300) Ending Balance AOCI December 31, 2018 $(55,227) $20,783 $(34,444)$ (9,310) $4,005 $(5,305) $(3,619) $— $(3,619) $(9,300)$(52,668) (1) The FSIRS reclassification amounts are included in the Net interest deductions line item on the Consolidated Statements of Income. (2) These AOCI components are included in the computation of net periodic benefit cost (see Note 11 – Pension and Other Postretirement Benefits for additional details). (3) The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in the Deferred charges and other assets line item on the Consolidated Balance Sheets). (4) Release of excess deferred taxes accumulated prior to December 22, 2017 (date of enactment of the TCJA), as a result of the adoption of ASU 2018-02 during the first quarter of 2018, which permitted such release. (5) Tax amounts related to the before-tax balance are calculated using a 24% effective rate after the release of previously stranded excess deferred taxes existing as a result of the TCJA; amounts prior to the December 22, 2017 enactment of the TCJA were calculated using a 38% effective rate. 98 | SOUTHWEST GAS HOLDINGS, INC. The following table represents a rollforward of AOCI, presented on Southwest’s Consolidated Balance Sheets: AOCI—Rollforward (Thousands of dollars) Defined Benefit Plans Tax (Expense) Benefit (10) After- Tax Before-Tax FSIRS Tax (Expense) Benefit (10) Before- Tax After- Tax Other AOCI Beginning Balance AOCI December 31, 2017 $(61,520) $22,293 $(39,227)$(12,655) $4,809 $(7,846)$ — $(47,073) Net actuarial gain/(loss) Other comprehensive income before reclassifications FSIRS amounts reclassified from AOCI (6) Amortization of prior service cost (7) Amortization of net actuarial loss (7) Regulatory adjustment (8) (20,426) (20,426) — 1,335 33,617 (8,233) 4,902 (15,524) — 4,902 — (320) (8,068) 1,976 (15,524) — — 3,345 — — — 1,015 25,549 (6,257) — — (804) — — — — — 2,541 — — — — (15,524) — (15,524) — 2,541 — 1,015 — 25,549 — (6,257) Net current period other comprehensive income (loss) attributable to Southwest Gas Corporation Reclassification of excess deferred taxes (9) Ending Balance AOCI December 31, 2018 6,293 (1,510) 4,783 3,345 (804) 2,541 — 7,324 — — — — — — (9,300) (9,300) $(55,227) $20,783 $(34,444)$ (9,310) $4,005 $(5,305)$(9,300)$(49,049) (6) The FSIRS reclassification amounts are included in the Net interest deductions line item on the Consolidated Statements of Income. (7) These AOCI components are included in the computation of net periodic benefit cost (see Note 11 – Pension and Other Postretirement Benefits for additional details). (8) The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in the Deferred charges and other assets line item on the Consolidated Balance Sheets). (9) Release of excess deferred taxes accumulated prior to December 22, 2017 (date of enactment of the TCJA), as a result of the adoption of ASU 2018-02 during the first quarter of 2018, which permitted such release. (10) Tax amounts related to the before-tax balances are calculated using a 24% effective rate after the release of previously stranded excess deferred taxes existing as a result of the TCJA; amounts prior to the December 22, 2017 enactment of the TCJA were calculated using a 38% effective rate. The following table represents amounts (before income tax impacts) included in Accumulated other comprehensive income (in the table above), that have not yet been recognized in net periodic benefit cost as of December 31, 2018 and 2017: Amounts Recognized in AOCI (Before Tax) (Thousands of dollars) Net actuarial (loss) gain Prior service cost Less: amount recognized in regulatory assets Recognized in AOCI 2018 2017 $(435,364) $(448,555) (4,368) 391,403 (3,033) 383,170 $ (55,227) $ (61,520) See Note 11 – Pension and Other Postretirement Benefits for more information on the defined benefit pension plans and Note 14 – Derivatives for more information on the FSIRS. Note 7 – Common Stock On March 29, 2017, the Company filed with the SEC an automatic shelf registration statement on Form S-3 (File No. 333-217018), which became effective upon filing, for the offer and sale of up to $150 million of common stock from time to time in at-the-market offerings under the prospectus included therein and in accordance with the Sales Agency Agreement, dated March 29, 2017, between SOUTHWEST GAS HOLDINGS, INC. | 99 the Company and BNY Mellon Capital Markets, LLC (the “Equity Shelf Program”). The following table provides the activity in the Equity Shelf Program for the three and twelve months ended December 31, 2018: Three Months Ended December 31, Twelve Months Ended December 31, 2018 2017 2018 2017 Gross proceeds Less: agent commissions Net proceeds Number of shares sold Weighted average price per share — — — — — $29,999,922 $85,149,976 $41,776,795 417,768 299,999 851,500 $29,699,923 $84,298,476 $41,359,027 358,630 1,145,705 $ 83.65 $ 74.32 $ 505,707 82.61 As of December 31, 2018, the Company had up to $23,073,229 of common stock available for sale under the program. Net proceeds from the sale of shares of common stock under the Equity Shelf Program are intended for general corporate purposes, including the acquisition of property for the construction, completion, extension, or improvement of pipeline systems and facilities located in and around the communities served by Southwest. Net proceeds during the twelve months ended December 31, 2018 were contributed to, and reflected in the records of, Southwest (as a capital contribution from Southwest Gas Holdings, Inc.). Aside from the automatic shelf registration, in December 2017, the Company and Southwest jointly filed with the SEC an automatic shelf registration statement (File No. 333-222047), which became effective upon filing and includes a prospectus detailing the Company’s ability to offer and sell, from time to time in amounts at prices and on terms that will be determined at the time of such offering, any combination of common stock, preferred stock, debt securities (which may or may not be guaranteed by one or more of its directly or indirectly wholly owned subsidiaries if indicated in the relevant prospectus supplement), guarantees of debt securities issued by Southwest, depository shares, warrants to purchase common stock, preferred stock or depository shares issued by the Company or debt securities issued by the Company or Southwest, units and rights (the “Universal Shelf”). Additionally as part of the Universal Shelf, Southwest may offer and sell, from time to time in amounts at prices and on terms that will be determined at the time of such offering, any combination of debt securities (which may or may not be guaranteed by one or more of its directly or indirectly wholly owned subsidiaries if indicated in the relevant prospectus supplement) and guarantees of debt securities issued by the Company or by one or more of its directly or indirectly wholly owned subsidiaries if indicated in the relevant prospectus supplement. In November 2018, the Company sold, through a prospectus supplement under the Universal Shelf, an aggregate of 3,565,000 shares of common stock, in an underwritten public offering, at $75.50 per share, resulting in proceeds to the Company of $260,073,524, net of $9,083,976 underwriters’ discount. The Company used a portion of the net proceeds from the offering to facilitate, in association with Centuri, the purchase of Linetec, to pay down outstanding borrowings under the Company’s credit facility, and used the remaining amounts for general corporate purposes. Refer to Note 19 – Business Acquisitions regarding the acquisition of Linetec and Note 9 – Short-Term Debt for information on the Company’s credit facility. During 2018, the Company issued approximately 83,000 shares of common stock through the Restricted Stock/Unit Plan, and Management Incentive Plan. Additionally during 2018, the Company issued 143,000 shares of common stock through the Dividend Reinvestment and Stock Purchase Plan (“DRSPP”), raising proceeds of approximately $10.6 million. As of December 31, 2018, there were 4.4 million common shares registered and available for issuance under the provisions of the various stock issuance plans, which does not include the amount of common stock available that is separately disclosed under the Equity Shelf Program above. 100 | SOUTHWEST GAS HOLDINGS, INC. Note 8 – Long-Term Debt Carrying amounts of long-term debt and related estimated fair values as of December 31, 2018 and December 31, 2017 are disclosed in the following table. Southwest’s revolving credit facility (including commercial paper) and the variable-rate Industrial Development Revenue Bonds (“IDRBs”) approximate their carrying values, as they are repaid quickly (in the case of credit facility borrowings) and have interest rates that reset frequently. These are categorized as Level 1 due to Southwest’s ability to access similar debt arrangements at measurement dates with comparable terms, including variable/market rates. The fair values of Southwest’s debentures, senior notes, and fixed-rate IDRBs were determined utilizing a market-based valuation approach, where fair values are determined based on evaluated pricing data, such as broker quotes and yields for similar securities adjusted for observable differences. Significant inputs used in the valuation generally include benchmark yield curves, credit ratings, and issuer spreads. The external credit rating, coupon rate, and maturity of each security are considered in the valuation, as applicable. The fair values of debentures and fixed-rate IDRBs are categorized as Level 2. The Centuri secured revolving credit and term loan facility and Centuri other debt obligations are categorized as Level 3, based on significant unobservable inputs to their fair values. Because Centuri’s debt is not publicly traded, fair values for the secured revolving credit and term loan facility and other debt obligations were based on a conventional discounted cash flow methodology and utilized current market pricing yield curves, across Centuri’s debt maturity spectrum, of other industrial bonds with an assumed credit rating comparable to the Company’s. The fair value hierarchy is described in Note 1 – Background, Organization, and Summary of Significant Accounting Policies. (Thousands of dollars) Southwest Gas Corporation: Debentures: Notes, 4.45%, due 2020 Notes, 6.1%, due 2041 Notes, 3.875%, due 2022 Notes, 4.875%, due 2043 Notes, 3.8%, due 2046 Notes, 3.7%, due 2028 8% Series, due 2026 Medium-term notes, 7.78% series, due 2022 Medium-term notes, 7.92% series, due 2027 Medium-term notes, 6.76% series, due 2027 Unamortized discount and debt issuance costs Revolving credit facility and commercial paper Industrial development revenue bonds: Variable-rate bonds: Tax-exempt Series A, due 2028 2003 Series A, due 2038 2008 Series A, due 2038 2009 Series A, due 2039 Unamortized discount and debt issuance costs Less: current maturities SOUTHWEST GAS HOLDINGS, INC. | 101 December 31, 2018 Market Carrying Value Amount December 31, 2017 Market Carrying Value Amount $ 125,000 $126,213 $ 125,000 $129,273 125,000 158,304 250,000 256,163 250,000 283,243 300,000 302,970 — 96,063 28,714 31,542 8,882 150,728 254,195 268,985 267,030 298,926 93,827 27,497 30,016 8,651 125,000 250,000 250,000 300,000 300,000 75,000 25,000 25,000 7,500 (11,807) — 75,000 25,000 25,000 7,500 (9,350) 1,470,693 1,173,150 150,000 150,000 150,000 150,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 (2,024) 197,976 — 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 (2,119) 197,881 — Long-term debt, less current maturities – Southwest Gas Corporation $1,818,669 $1,521,031 Centuri: Centuri term loan facility Unamortized debt issuance costs Centuri secured revolving credit facility Centuri other debt obligations Less: current maturities $ 255,959 (1,414) 254,545 — 67,104 (33,060) 260,135 $ 199,578 207,588 (1,111) 198,467 56,472 47,952 (25,346) 56,525 48,183 — 67,053 Long-term debt, less current maturities – Centuri $ 288,589 $ 277,545 Consolidated Southwest Gas Holdings, Inc.: Southwest Gas Corporation long-term debt Centuri long-term debt Less: current maturities Long-term debt, less current maturities – Southwest Gas Holdings, Inc. $1,818,669 321,649 (33,060) $2,107,258 $1,521,031 302,891 (25,346) $1,798,576 Southwest has a $400 million credit facility which expires in March 2022. Southwest designates $150 million of capacity related to the facility as long-term debt and has designated the remaining $250 million for working capital purposes. Interest rates for the credit facility are calculated at either the London Interbank Offered Rate (“LIBOR”) or an “alternate base rate,” plus in each case an applicable margin that is determined based on Southwest’s senior unsecured debt rating. At December 31, 2018, the applicable margin 102 | SOUTHWEST GAS HOLDINGS, INC. is 1% for loans bearing interest with reference to LIBOR and 0% for loans bearing interest with reference to the alternative base rate. Southwest is also required to pay a commitment fee, of 0.10% per annum, on the unfunded portion of the commitments, which was not significant for the year ended December 31, 2018. At December 31, 2018, $150 million was outstanding on the long-term portion of the credit facility, $50 million of which was in commercial paper (see commercial paper program discussion below). The effective interest rate on the long-term portion of the credit facility was 3.41% at December 31, 2018. Borrowings under the credit facility ranged from none at various times throughout 2018 to a high of $378 million during the first quarter of 2018. With regard to the short-term portion of the credit facility, there was $152 million outstanding at December 31, 2018 and $191 million in borrowings outstanding at December 31, 2017. (See Note 9 – Short-Term Debt). Southwest has a $50 million commercial paper program. Any issuance under the commercial paper program is supported by Southwest’s current revolving credit facility and, therefore, does not represent additional borrowing capacity. Any borrowing under the commercial paper program will be designated as long-term debt. Interest rates for the program are calculated at the then current commercial paper rate. At December 31, 2018, and as noted above, $50 million was outstanding under the commercial paper program. In March 2018, Southwest issued $300 million in 3.7% Senior Notes at a discount of 0.185%. The notes will mature in March 2028. The proceeds were used to temporarily pay down, in full, the amount then outstanding under the revolving portion of the credit facility and the remainder to repay amounts then outstanding under the commercial paper program. In November 2018, Centuri, in association with the acquisition of Linetec (refer to Note 19 – Business Acquisitions), amended and increasing the borrowing capacity from $450 million to restated its senior secured revolving credit and term loan facility, $590 million. The line of credit portion of the facility increased to $325 million; amounts borrowed and repaid under the revolving credit facility are available to be re-borrowed. The term loan facility portion increased to $265 million. The $590 million credit and term loan facility expires in November 2023 and continues to be secured by substantially all of Centuri’s assets except those explicitly excluded under the terms of the agreement (including owned real estate and certain construction and transportation equipment). Centuri assets securing the facility at December 31, 2018 totaled $1.1 billion. Interest rates for Centuri’s $590 million secured revolving credit and term loan facility are calculated at LIBOR, the Canadian Dealer Offered Rate (“CDOR”), or an alternate base rate or Canadian base rate, plus in each case an applicable margin that is determined based on Centuri’s consolidated leverage ratio. The applicable margin ranges from 0.875% to 2.25% for loans bearing interest with reference to LIBOR or CDOR and from 0.00% to 1.25% for loans bearing interest with reference to the alternate base rate or Canadian base rate. Centuri is also required to pay a commitment fee on the unfunded portion of the commitments based on their consolidated leverage ratio. The commitment fee ranges from 0.125% to 0.35% per annum. Borrowings under the secured revolving credit facility ranged from a low of zero during December 2018 to a high of $103 million during July 2018. At December 31, 2018 $256 million in borrowings were outstanding under the combined secured revolving credit and term loan facility. All amounts outstanding are considered long-term borrowings. The effective interest rate on the secured revolving credit and term loan facility was 4.1% at December 31, 2018. The effective interest rates on Southwest’s variable-rate IDRBs are included in the table below: 2003 Series A 2008 Series A 2009 Series A Tax-exempt Series A December 31, 2018 December 31, 2017 2.61% 2.52% 2.51% 2.53% 2.44% 2.59% 2.40% 2.56% SOUTHWEST GAS HOLDINGS, INC. | 103 In Nevada, interest fluctuations due to changing interest rates on Southwest’s 2003 Series A, 2008 Series A, and 2009 Series A variable-rate IDRBs are tracked and recovered from ratepayers through a variable interest expense recovery mechanism. None of Southwest’s debt instruments have credit triggers or other clauses that result in default if bond ratings are lowered by rating agencies. Interest and fees on certain debt instruments are subject to adjustment depending on Southwest’s bond ratings. Certain debt instruments are subject to a leverage ratio cap and the 6.1% note due 2041 is also subject to a minimum net worth requirement. At December 31, 2018, Southwest was in compliance with all of its covenants. Under the most restrictive of the financial covenants, approximately $2.1 billion in additional debt could be issued while still meeting the leverage ratio requirement. Relating to the minimum net worth requirement, as of December 31, 2018, there is at least $1.2 billion of cushion in equity. No specific dividend restrictions exist under the collective covenants. None of the debt instruments contain material adverse change clauses. Certain Centuri debt instruments have leverage ratio caps and fixed charge ratio coverage requirements. At December 31, 2018, Centuri was in compliance with all of its covenants. Under the most restrictive of the covenants, Centuri could issue over $101 million in additional debt and meet the leverage ratio requirement. Centuri has at least $78 million of cushion relating to the minimum fixed charge ratio coverage requirement. Centuri’s revolving credit and term loan facility is secured by underlying assets of the utility infrastructure services segment. Centuri’s covenants limit its ability to provide cash dividends to Southwest Gas Holdings, Inc., its parent. The dividend restriction is equal to a maximum of 60% of its rolling twelve-month consolidated net income. Estimated maturities of long-term debt for the next five years are (in thousands): 2019 2020 2021 2022 2023 Southwest Centuri Total $ 125,000 — 425,000 — — $ 33,060 38,296 33,571 35,515 178,614 $ 33,060 163,296 33,571 460,515 178,614 Note 9 – Short-Term Debt In March 2017, Southwest Gas Holdings, Inc. entered into a credit facility with a borrowing capacity of $100 million that expires in March 2022. The Company utilizes this facility for short-term financing needs. Interest rates for this facility are calculated at either LIBOR or the “alternate base rate,” plus in each case an applicable margin that is determined based on the Company’s senior unsecured debt rating. At December 31, 2018, the applicable margin is 1.125% for loans bearing interest with reference to LIBOR and 0.125% for loans bearing interest with reference to the alternative base rate. The Company is also required to pay a commitment fee, of 0.15% per annum, on the unfunded portion of the commitments, which was not significant for the period ended December 31, 2018. Borrowings under the credit facility ranged from none at various times throughout 2018 to a high of $23.5 million during the first quarter of 2018. At December 31, 2018 and 2017, there were no borrowings and $23.5 million outstanding under this facility, respectively, with a weighted average interest rate of 2.65% at December 31, 2017. At December 31, 2018, Southwest Holdings, Inc. was in compliance with all of its credit facility covenants. Interest and fees on the credit facility are subject to adjustment depending on its bond ratings. The credit facility is subject to a leverage ratio cap. No specific dividend restrictions exist under the collective covenants. The credit facility does not contain a material adverse change clause. As discussed in Note 8 – Long-Term Debt, Southwest has a $400 million credit facility that is scheduled to expire in March 2022, of which $250 million has been designated by management for working capital purposes. Southwest had $152 million of short-term 104 | SOUTHWEST GAS HOLDINGS, INC. borrowings outstanding at December 31, 2018 and $191 million short-term borrowings outstanding at December 31, 2017 with weighted average interest rates of 3.47% and 2.52%, respectively. Note 10 – Commitments and Contingencies The Company and Southwest are defendants in miscellaneous legal proceedings. The Company and Southwest are also parties to various regulatory proceedings. The ultimate dispositions of these proceedings are not presently determinable; however, it is the opinion of management that no litigation or regulatory proceeding to which the Company and Southwest are currently subject to will have a material adverse impact on their financial position, results of operations, or cash flows. Southwest maintains liability insurance for various risks associated with the operation of its natural gas pipelines and facilities. In connection with these liability insurance policies, Southwest is responsible for an initial deductible or self-insured retention amount per incident, after which the insurance carriers would be responsible for amounts up to the policy limits. For the policy year August 2018 to July 2019, these liability insurance policies require Southwest to be responsible for the first $1 million (self-insured retention) of each incident plus the first $4 million in aggregate claims above its self-insured retention in the policy year. Through an assessment process, Southwest may determine that certain costs are likely to be incurred in the future related to specific legal matters. In these circumstances and in accordance with accounting policies, Southwest will make an accrual, as necessary. Centuri maintains liability insurance for various risks associated with its operations. In connection with these liability insurance policies, Centuri is responsible for an initial deductible or self-insured retention amount per occurrence, after which the insurance carriers would be responsible for amounts up to the policy limits. For the policy year April 2018 to March 2019, Centuri is responsible for the first $300,000 (self-insured retention) per occurrence under these liability insurance policies. Note 11 – Pension and Other Postretirement Benefits An Employees’ Investment Plan is offered to eligible employees of Southwest through deduction of a percentage of base compensation, subject to IRS limitations. The Employees’ Investment Plan provides for purchases of various mutual fund investments and Company common stock. One-half of amounts deferred by employees are matched, up to a maximum matching contribution of 3.5% of an employee’s annual compensation. The cost of the plan is disclosed below (in thousands): Employee Investment Plan cost Centuri has a separate plan, the cost and liability of which are not significant. 2018 2017 2016 $5,530 $5,112 $4,976 A deferred compensation plan is offered to all officers of Southwest and a separate deferred compensation plan for members of the Company’s Board of Directors. The plans provide the opportunity to defer up to 100% of annual cash compensation. One-half of amounts deferred by officers are matched, up to a maximum matching contribution of 3.5% of an officer’s annual base salary. Upon retirement, payments of compensation deferred, plus interest, are made in equal monthly installments over 10, 15, or 20 years, as elected by the participant. Directors have an additional option to receive such payments over a five-year period. Deferred compensation earns interest at a rate determined each January. The interest rate equals 150% of Moody’s Seasoned Corporate Bond Rate Index. A noncontributory qualified retirement plan with defined benefits covering substantially all Southwest employees is available in addition to a separate unfunded supplemental executive retirement plan (“SERP”) which is limited to Southwest’s officers. Postretirement benefits other than pensions (“PBOP”) are provided to qualified retirees for health care, dental, and life insurance benefits. SOUTHWEST GAS HOLDINGS, INC. | 105 The overfunded or underfunded positions of defined benefit postretirement plans, including pension plans, are recognized in the Consolidated Balance Sheets. Any actuarial gains and losses, prior service costs and transition assets or obligations are recognized in Accumulated other comprehensive income under Stockholders’ equity, net of tax, until they are amortized as a component of net periodic benefit cost. A regulatory asset has been established for the portion of the total amounts otherwise chargeable to Accumulated other comprehensive income that are expected to be recovered through rates in future periods. Changes in actuarial gains and losses and prior service costs pertaining to the regulatory asset will be recognized as an adjustment to the regulatory asset account as these amounts are amortized and recognized as components of net periodic pension costs each year. The qualified retirement plan invests the majority of its plan assets in common collective trusts which includes a well-diversified portfolio of domestic and international equity securities and fixed income securities, which are managed by a professional investment manager appointed by Southwest. The investment manager has full discretionary authority to direct the investment of plan assets held in trust within the specific guidelines prescribed by Southwest through the plan’s investment policy statement. In 2016, Southwest adopted a liability driven investment (“LDI”) strategy for part of the portfolio, a form of investing designed to better match the movement in pension plan assets with the impact of interest rate changes and inflation assumption changes on the pension plan liability. The implementation of the LDI strategy will be phased in over time by using a glide path. The glide path is designed to increase the allocation of the plan’s assets to fixed income securities, as the funded status of the plan increases, in order to more closely match the duration of the plan assets to that of the plan liability. Pension plan assets are held in a Master Trust. The pension plan funding policy is in compliance with the federal government’s funding requirements. Pension costs for these plans are affected by the amount and timing of cash contributions to the plans, the return on plan assets, discount rates, and by employee demographics, including age, compensation, and length of service. Changes made to the provisions of the plans may also impact current and future pension costs. Actuarial formulas are used in the determination of pension costs and are affected by actual plan experience and assumptions about future experience. Key actuarial assumptions include the expected return on plan assets, the discount rate used in determining the projected benefit obligation and pension costs, and the assumed rate of increase in employee compensation. Relatively small changes in these assumptions, particularly the discount rate, may significantly affect pension costs and plan obligations for the qualified retirement plan. In determining the discount rate, management matches the plan’s projected cash flows to a spot-rate yield curve based on highly rated corporate bonds. Changes to the discount rate from year-to-year, if any, are generally made in increments of 25 basis points. There was a 75 basis points increase in the discount rate between years, as reflected below. The methodology utilized to determine the discount rate was consistent with prior years. The weighted-average rate of compensation increase remained the same (consistent with management’s expectations overall). The asset return assumption (which impacts the following year’s expense) remained unchanged. The rates are presented in the table below: Discount rate Weighted-average rate of compensation increase Asset return assumption December 31, 2018 December 31, 2017 4.50% 3.25% 7.00% 3.75% 3.25% 7.00% Pension expense for 2019 is estimated to be less than that experienced in 2018. Future years’ expense level movements (up or down) will continue to be greatly influenced by long-term interest rates, asset returns, and funding levels. 106 | SOUTHWEST GAS HOLDINGS, INC. The following table sets forth the retirement plan, SERP, and PBOP funded statuses and amounts recognized on the Consolidated Balance Sheets and Consolidated Statements of Income. 2018 2017 Qualified Retirement Plan SERP PBOP Qualified Retirement Plan SERP PBOP (Thousands of dollars) Change in benefit obligations Benefit obligation for service rendered to date at beginning of year (PBO/PBO/ APBO) Service cost Interest cost Actuarial loss (gain) Benefits paid Benefit obligation at end of year (PBO/ PBO/APBO) Change in plan assets Market value of plan assets at beginning of year Actual return on plan assets Employer contributions Benefits paid Market value of plan assets at end of year $1,203,484 28,555 44,174 (102,919) (57,280) $ 45,727 245 1,658 (3,940) (3,087) $ 75,322 1,473 2,748 (6,020) (3,567) $1,048,353 23,392 46,083 133,017 (47,361) $ 43,311 309 1,883 3,334 (3,110) $ 73,865 1,468 3,232 (71) (3,172) 1,116,014 40,603 69,956 1,203,484 45,727 75,322 871,665 (67,771) 44,000 (57,280) 790,614 — 54,608 (3,061) — — 3,087 (4,206) (3,087) — 47,341 738,962 144,064 36,000 (47,361) 871,665 — 48,113 7,742 — — 3,110 (1,247) (3,110) — 54,608 Funded status at year end $ (325,400) $(40,603) $(22,615) $ (331,819) $(45,727) $(20,714) Weighted-average assumptions (benefit obliga- tion) Discount rate Weighted-average rate of compensation 4.50% 4.50% 4.50% 3.75% 3.75% 3.75% increase 3.25% 3.25% N/A 3.25% 3.25% N/A Estimated funding for the plans above during calendar year 2019 is approximately $55 million, of which $52 million pertains to the retirement plan. Management monitors plan assets and liabilities and could, at its discretion, increase plan funding levels above the minimum in order to achieve a desired funded status and avoid or minimize potential benefit restrictions. The accumulated benefit obligation for the retirement plan and the SERP is presented below (in thousands): Retirement plan SERP December 31, 2018 December 31, 2017 $1,024,030 38,793 $1,088,203 44,343 SOUTHWEST GAS HOLDINGS, INC. | 107 Benefits expected to be paid for pension, SERP, and PBOP over the next 10 years are as follows (in millions): Pension SERP PBOP 2019 $54.0 3.0 4.5 2020 $55.0 2.9 4.6 2021 $56.0 2.9 4.6 2022 $58.0 2.9 4.6 2023 $59.0 2.8 4.5 2024-2028 $319.0 13.6 20.9 No assurance can be made that actual funding and benefits paid will match these estimates. For PBOP measurement purposes, the per capita cost of the covered health care benefits medical rate trend assumption is 6.0%, declining to 4.5%. Fixed contributions are made for health care benefits of employees who retire after 1988, but Southwest pays all covered health care costs for employees who retired prior to 1989. The medical trend rate assumption noted above applies to the benefit obligations of pre-1989 retirees only. As of January 1, 2018, the Company adopted “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The update requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations and be appropriately described. The update also allows only the service cost component (and not the other components of periodic benefit costs) to be eligible for capitalization when applicable, making no exception for specialized industries, including rate-regulated industries. This guidance is required to be applied on a retrospective basis for the presentation of the service cost and other components of net benefit cost, and on a prospective basis for the capitalization of only the service cost component of net benefit cost. Amounts capitalized as part of assets prior to the date of adoption were not adjusted through a cumulative effect adjustment. The guidance allows a practical expedient for the retrospective application that permits use of the amounts disclosed for the various components of net benefit cost in the pension and other postretirement benefit plans footnote as the basis for the retrospective application. This is in lieu of determining how much of the various components of net benefit cost were actually reflected in the income statement each period as a result of capitalization of certain costs into assets and their subsequent amortization. The Company and Southwest have elected to utilize the practical expedient. Therefore, upon adoption of the update to Topic 715, amounts presented in the Company’s and Southwest’s Consolidated Statements of Income for the years ended 2017 and 2016 have been revised as required by the update, as follows (in thousands): Southwest Gas Holdings, Inc. Operations and maintenance Other income (deductions) Southwest Gas Corporation Operations and maintenance Other income (deductions) December 31, 2017 December 31, 2016 As Reported Reclassification Revised As Reported Reclassification Revised $412,187 13,394 $(19,424) (19,424) $392,763 (6,030) $401,724 9,469 $(19,760) (19,760) $381,964 (10,291) $410,745 13,036 $(19,424) (19,424) $391,321 (6,388) $401,724 8,276 $(19,760) (19,760) $381,964 (11,484) Operating income increased by the same amounts that Operations and maintenance expense decreased as reflected in the table above; however, net income was not impacted by this reclassification for either the Company or Southwest. The service cost component of net periodic benefit costs included in the table below is part of an overhead loading process associated with the cost of labor (refer to discussion above in association with the update to Topic 715). The overhead process ultimately results 108 | SOUTHWEST GAS HOLDINGS, INC. in allocation of that portion of overall net periodic benefit costs to the same accounts to which productive labor is charged. As a result, service costs become components of various accounts, primarily Operations and maintenance expense, Net utility plant, and Deferred charges and other assets for both the Company and Southwest. Refer to the discussion above regarding the practical expedient elected related to amounts capitalized as part of assets prior to the adoption date. Components of net periodic benefit cost: (Thousands of dollars) Service cost Interest cost Expected return on plan assets Amortization of prior service cost Amortization of net actuarial loss Qualified Retirement Plan 2016 2017 2018 SERP 2017 2018 2016 2018 PBOP 2017 2016 46,083 46,027 1,658 1,883 1,859 $ 28,555 $ 23,392 $ 22,833 $ 245 $ 309 $ 331 $ 1,473 $ 1,468 $ 1,499 3,180 — (3,718) (3,358) (3,149) 1,335 — 1,335 — 417 — 44,174 (58,755) (55,196) (56,558) — — — 24,004 25,266 1,502 1,441 1,383 — 32,115 — — 1,335 3,232 2,748 — Net periodic benefit cost $ 46,089 $ 38,283 $ 37,568 $3,405 $3,633 $3,573 $ 1,838 $ 2,677 $ 3,282 Weighted-average assumptions (net benefit cost) Discount rate Expected return on plan assets Weighted-average rate of compensation increase 3.75% 4.50% 4.50% 3.75% 4.50% 4.50% 3.75% 4.50% 4.50% 7.00% 7.00% 7.25% 7.00% 7.00% 7.25% N/A N/A N/A 3.25% 3.25% 3.25% 3.25% 3.25% 3.25% N/A N/A N/A Other Changes in Plan Assets and Benefit Obligations Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Thousands of dollars) Net actuarial loss (gain) (a) Amortization of prior service cost (b) Amortization of net actuarial loss (b) Regulatory adjustment Recognized in other comprehensive (income) loss Net periodic benefit costs recognized in net income Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss 2018 Qualified Retirement Plan Total SERP PBOP Total 2017 Qualified Retirement Plan SERP PBOP Total 2016 Qualified Retirement Plan SERP PBOP $ 20,426 $ 23,607 $(3,940) $ 759 $ 43,027 $ 44,149 $ 3,334 $(4,456) $ 22,770 $ 25,153 $ 1,347 $(3,730) (1,335) — — (1,335) (1,335) — — (1,335) (1,335) — — (1,335) (33,617) 8,233 (32,115) 7,657 (1,502) — — (25,445) (12,340) 576 (24,004) (18,131) (1,441) — 5,791 — (27,066) 5,584 (25,266) 102 (1,383) (417) — 5,482 (6,293) (851) (5,442) — 3,907 2,014 1,893 — (47) (11) (36) — 51,332 46,089 3,405 1,838 44,593 38,283 3,633 2,677 44,423 37,568 3,573 3,282 $ 45,039 $ 45,238 $(2,037) $ 1,838 $ 48,500 $ 40,297 $ 5,526 $ 2,677 $ 44,376 $ 37,557 $ 3,537 $ 3,282 The table above discloses the net gain or loss and prior service cost recognized in other comprehensive income, separated into (a) amounts initially recognized in other comprehensive income, and (b) amounts subsequently recognized as adjustments to other comprehensive income as those amounts are amortized as components of net periodic benefit cost. See also Note 6 – Other Comprehensive Income and Accumulated Other Comprehensive Income (“AOCI”). SOUTHWEST GAS HOLDINGS, INC. | 109 The following table sets forth, by level within the three-level fair value hierarchy, the fair values of the assets of the qualified pension plan and the PBOP as of December 31, 2018 and December 31, 2017. The SERP has no assets. Assets at fair value (thousands of dollars): Level 1 – Quoted prices in active markets for identical financial assets Mutual funds Total Level 1 Assets (1) Level 2 – Significant other observable inputs Private commingled equity funds (2) International U.S. equity securities Emerging markets Private commingled fixed income funds (3) Pooled funds and mutual funds Government fixed income and mortgage backed securities Total Level 2 assets (4) Total Plan assets at fair value Insurance company general account contracts (5) Total Plan assets December 31, 2018 December 31, 2017 Qualified Retirement Plan PBOP Total Qualified Retirement Plan PBOP Total $ $ — $25,299 $ 25,299 — $25,299 $ 25,299 $ $ — $27,020 $ 27,020 — $27,020 $ 27,020 $309,745 147,693 50,817 274,062 5,198 163 $ 8,484 4,045 1,392 7,506 610 5 $318,229 151,738 52,209 281,568 5,808 168 $340,217 165,937 56,259 301,217 4,676 172 $10,577 5,158 1,749 9,364 735 5 $350,794 171,095 58,008 310,581 5,411 177 $787,678 $22,042 $809,720 $868,478 $27,588 $896,066 $787,678 2,936 $47,341 — $835,019 2,936 $868,478 3,187 $54,608 — $923,086 3,187 $790,614 $47,341 $837,955 $871,665 $54,608 $926,273 (1) The Mutual funds category above is a balanced fund that invests in a diversified portfolio of common stocks, preferred stocks, and fixed-income securities. The fund seeks regular income, conservation of principal, and an opportunity for long-term growth of principal and income. (2) The private commingled equity funds include common collective trusts that invest in a diversified portfolio of domestic and international securities regularly traded on securities exchanges. These funds are shown in the above table at net asset value (“NAV”), which is the value of securities in the fund less the amount of any liabilities outstanding. Strategies employed by the funds include investment in: • International developed countries equities • Domestic equities • Emerging markets equities Shares in the private commingled equity funds may be redeemed given one business day notice. While they are private equity funds and reported at NAV, due to the short redemption notice period, the lack of redemption fees, the fact that the underlying investments are exchange-traded, and that substantial liabilities do not exist subject to the NAV calculation, these investments are viewed as indirectly observable (Level 2) and are therefore not excluded from the body of the fair value table as a reconciling item. Two funds are classified as international funds. One invests in international financial markets, primarily those of developed economies in Europe and the Pacific Basin. The fund invests primarily in equity securities issued by foreign corporations, but may invest in other securities perceived as offering attractive investment return opportunities. The other fund provides diversified exposure to global equity markets. The fund seeks to provide long-term capital growth by investing primarily in securities listed on the major developed equity markets of the U.S., Europe, and Asia, as well as within those listed on emerging country equity markets on a tactical basis. 110 | SOUTHWEST GAS HOLDINGS, INC. The domestic equities securities funds include a large and medium capitalization fund and a small capitalization fund. The large and medium capitalization fund is designed to track the performance of the large and medium capitalization companies contained in the index, which represents approximately 90% of the market capitalization of the U.S. stock market. The small capitalization fund is designed to provide maximum long-term appreciation through investments that are well diversified by industry. The emerging markets fund was developed to invest in emerging market equities worldwide. The purposes of the fund’s operations, “emerging market countries,” include every country in the world except the developed markets of the U.S., Canada, Japan, Australia, New Zealand, Hong Kong, and Singapore, and most countries located in Western Europe. Fund investments are made directly in each country or, where direct investment is inefficient or prohibited, through appropriate financial instruments or participation in commingled funds. (3) The private commingled fixed income funds consist primarily of fixed income debt securities issued by the U.S. Treasury, government agencies, and fixed income debt securities issued by corporations. The fixed income fund investments may include the use of high yield, international fixed income securities and other instruments, including derivatives, to ensure prudent diversification over a broad spectrum of investments. The changes in the value of the fixed income funds are intended to offset the changes in the pension plan liabilities due to changes in the discount rate. These funds are shown in the above table at NAV. Shares in the private commingled fixed equity funds may be redeemed given one business day notice. While they are private fixed income funds and reported at NAV, due to the short redemption notice period, the lack of redemption fees, the fact that the underlying investments are exchange-traded, and that substantial liabilities do not exist subject to the NAV calculation, these investments are viewed as indirectly observable (Level 2), and are also not excluded from the body of the fair value table as a reconciling item. (4) With the exception of items (2) and (3), which are discussed in detail above, the Level 2 assets consist mainly of pooled funds and mutual funds. These funds are collective short-term funds that invest in Treasury bills and money market funds and are used as a temporary cash repository. (5) The insurance company general account contracts are annuity insurance contracts used to pay the pensions of employees who retired prior to 1989. The balance of the account disclosed in the above table is the contract value, which is the result of deposits, withdrawals, and interest credits. Note 12 – Share-Based Compensation At December 31, 2018, three share-based compensation plans existed at Southwest: an omnibus incentive plan, a management incentive plan, and a restricted stock/unit plan. All previous grants under the stock option plan expired in 2016. The table below shows total share-based plan compensation expense which was recognized in the Consolidated Statements of Income (in thousands): Share-based compensation plan expense, net of related tax benefits Share-based compensation plan related tax benefits 2018 2017 2016 $4,644 1,467 $6,751 4,137 $7,185 4,404 Under the option plan, options to purchase shares of common stock at a stated exercise price were previously granted to key employees and outside directors. The last option grants were in 2006 and no future grants are currently anticipated. Each option had an exercise price equal to the market price of the Company’s common stock on the date of grant and a maximum term of ten years. The final options were exercised in 2016. SOUTHWEST GAS HOLDINGS, INC. | 111 The following tables summarize the stock option plan activity and related information (thousands of options): Outstanding at the beginning of the year Exercised during the year Forfeited or expired during the year Outstanding and exercisable at year end 2018 2017 2016 Number of options Weighted- average exercise price Number of options Weighted- average exercise price Number of options Weighted- average exercise price — — — — N/A — — N/A — — — — N/A — — N/A 17 (17) — — $31.64 31.64 — N/A The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option. The aggregate intrinsic value of outstanding and exercisable options, and options that were exercised, are presented in the table below (in thousands): Outstanding and exercisable Exercised 2018 2017 $— — $— — 2016 $ — 554 December 31, 2018 December 31, 2017 December 31, 2016 Market value of Company stock $76.50 $80.48 $76.62 In 2017, the Board of Directors of the Company and shareholders approved the omnibus incentive plan. The purpose of the omnibus incentive plan is to promote the long-term growth and profitability of the Company by providing directors, employees, and certain other individuals with incentives to increase shareholder value and otherwise contribute to the success of the Company. In addition, the plan will enable the Company to attract, retain, and reward the best available persons for positions of responsibility. The omnibus incentive plan provides for the grant of stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, and other equity-based and cash awards. Employees, directors, and consultants who provide services to the Company or any subsidiary may be eligible under this plan. Under the management incentive plan, awards were historically granted to encourage key employees of Southwest to remain as employees and to achieve short-term and long-term performance goals. Plan participants were eligible to receive a cash bonus (i.e., short-term incentive) and shares (i.e., long-term incentive). The shares granted vest three years after grant and are then issued as common stock. No new share grants will be made under the management incentive plan as all future incentive share compensation will be granted under the omnibus incentive plan. Restricted stock/units under the restricted stock/unit plan were issued to attract, motivate, retain, and reward key employees of Southwest with an incentive to attain high levels of individual performance and improved financial performance. The restricted stock/units vest 40% at the end of year one and 30% at the end of years two and three and are issued annually as common stock in accordance with the percentage vested. The restricted stock/unit plan was also established to attract, motivate, and retain experienced and knowledgeable independent directors. Vesting for grants of restricted stock/units to directors occurred immediately upon grant. The issuance of common stock for directors currently occurs when their service on the Board ends. No new grants will be made under the legacy restricted stock/unit plan as all future incentive compensation, including restricted stock, will be granted under programs of the omnibus incentive plan. For grants under the omnibus incentive plan, directors continue to immediately vest in the shares upon grant but are provided the option to defer receipt of equity compensation until they leave the Board of Directors. With regard to management, grants of time-lapse restricted stock vest based on the same percentages indicated above under the legacy program. 112 | SOUTHWEST GAS HOLDINGS, INC. Performance-based incentive opportunities under the omnibus plan were granted to all officers of Southwest in the form of performance shares and will be based on, depending on the officer, consolidated earnings per share, utility net income, and utility return on equity, with an adjustment based on relative total shareholder return, in each case, measured over a three-year performance period from January 1, 2018 to December 31, 2020 for the performance shares granted in 2018, and from January 1, 2017 to December 31, 2019 for the performance shares granted in 2017. Southwest recorded $2.1 million and $1.2 million of estimated compensation expense associated with these shares during 2018 and 2017, respectively. The following table summarizes the activity of the management incentive plan shares and restricted stock/units as of December 31, 2018 (thousands of shares): Nonvested/unissued at December 31, 2017 Granted Dividends Forfeited or expired Vested and issued (2) Nonvested/unissued at December 31, 2018 Management Incentive Plan Shares 127 — 2 (1) (63) 65 Weighted- average grant date fair value $63.98 66.86 59.41 $66.51 Restricted Stock/ Units (1) Weighted- average grant date fair value 305 77 7 (1) (65) 323 $57.41 69.16 72.39 71.00 $56.16 (1) The number of securities granted includes 34,000 performance shares, which was derived by assuming that target performance will be achieved during the relevant performance period. (2) Includes shares for retiree payouts and those converted for taxes. The weighted average grant date fair value of management incentive plan shares granted in 2017 and 2016 was $85.44 and $59.05, respectively. The weighted average grant date fair value of restricted stock/units granted in 2017 and 2016 was $85.39 and $60.39, respectively. As of December 31, 2018, total compensation cost related to nonvested management incentive plan shares and restricted stock/units not yet recognized is $4.0 million, which is expected to be recognized over a weighted average period of 1.5 years. Note 13 – Income Taxes On December 22, 2017, the TCJA was enacted. The majority of the provisions of the TCJA are effective for taxable years beginning after December 31, 2017. The TCJA significantly changes the taxation of business entities with specific provisions for regulated public utilities, such as Southwest. The following are the major provisions (not all-inclusive) of the TCJA’s impact on the Company and Southwest: • Reduction of the federal income tax rate from 35% to 21%, effective January 1, 2018. • Bonus depreciation considerations for utility property placed-in-service after September 27, 2017. 100% bonus depreciation for most non-utility property placed-in-service after September 27, 2017. • Interest expense limitations for interest allocable to non-utility businesses. Interest expense allocable to utility businesses will • have no limitation. Under U.S. GAAP, specifically ASC Topic 740 “Income Taxes” (“ASC 740”), the tax effects of changes in tax laws must be recognized in the period in which the law is enacted. Therefore, the TCJA impacted the Company’s and Southwest’s financial SOUTHWEST GAS HOLDINGS, INC. | 113 statements in the fourth quarter of 2017. ASC 740 also requires deferred tax assets and liabilities to be re-measured at the enacted tax rate expected to apply when temporary differences are to be realized or settled. Thus, at the date of enactment, the Company’s deferred taxes were re-measured using the new federal income tax rate (21%). For regulated entities, the reduction in plant-related deferred tax liabilities is recorded as a regulatory liability to be refunded to customers. For unregulated operations, the change in deferred taxes is recorded as an adjustment to deferred tax expense. The staff of the SEC recognized the complexity of determining the impact of the TCJA, and on December 22, 2017 issued guidance in Staff Accounting Bulletin 118 (“SAB 118”). SAB 118 provides that to the extent the accounting for certain income tax effects of the TCJA is incomplete, but a company can determine a reasonable estimate for those effects, the company may include in its financial statements the reasonable estimate that it had determined. The reasonable estimate would be reported as a provisional amount in the company’s financial statements during a “measurement period”, not to exceed one year from the date of enactment of the TCJA. Southwest and the Company included provisional reasonable estimates for the measurement and accounting of the effects of the TCJA, which were reflected in the consolidated financial statements as of and for the year ended December 31, 2017. The Company and Southwest continued to analyze and refine the estimate and classification of all provisional items, during the measurement period, as additional accounting, regulatory, and U.S. Treasury guidance was provided. Adjustments made to the provisional amounts allowed under SAB 118 were identified and recorded as discrete adjustments during the year ended December 31, 2018. The accounting was completed in the fourth quarter of 2018. Southwest Gas Holdings, Inc.: The following is a summary of income before taxes and noncontrolling interest for domestic and foreign operations (thousands of dollars): Year ended December 31, U.S. Foreign Total income before income taxes 2018 2017 2016 $235,120 8,216 $246,131 12,899 $218,810 12,713 $243,336 $259,030 $231,523 Income tax expense (benefit) consists of the following (thousands of dollars): Year Ended December 31, 2018 2017 2016 Current: Federal State Foreign Deferred: Federal State Foreign Total income tax expense $(13,476) (3,219) 2,563 $ (1,316) 2,965 5,203 $ 541 5,748 4,298 (14,132) 6,852 10,587 67,784 8,901 (869) 58,443 1,837 (2,044) 68,270 140 (529) 75,816 58,236 67,881 $ 61,684 $65,088 $78,468 114 | SOUTHWEST GAS HOLDINGS, INC. Deferred income tax expense (benefit) consists of the following significant components (thousands of dollars): Year Ended December 31, Deferred federal and state: Property-related items Purchased gas cost adjustments Employee benefits Regulatory Adjustments All other deferred Total deferred federal and state Deferred ITC, net Total deferred income tax expense 2018 2017 2016 $ 94,899 (3,507) (7,334) 2,412 (10,041) $44,516 8,500 (2,517) 14,401 (5,935) $ 76,217 361 (1,327) 6,322 (12,854) 76,429 (613) 58,965 (729) 68,719 (838) $ 75,816 $58,236 $ 67,881 A reconciliation of the U.S. federal statutory rate to the consolidated effective tax rate for 2018, 2017, and 2016 (and the sources of these differences and the effect of each) are summarized as follows: Year Ended December 31, U.S. federal statutory income tax rate Net state taxes Tax credits Company owned life insurance Change in U.S. Federal Income Tax Rate All other differences Consolidated effective income tax rate 2018 2017 2016 21.0% 35.0% 35.0% 2.9 (0.3) 0.1 1.1 (0.4) (1.6) — (7.8) 1.4 (0.4) (1.2) — 1.6 (1.2) (0.9) 25.3% 25.1% 33.9% Deferred tax assets and liabilities consist of the following (thousands of dollars): December 31, Deferred tax assets: Deferred income taxes for future amortization of ITC and excess deferred taxes Employee benefits Alternative minimum tax credit Net operating losses and credits Interest rate swap Other Valuation allowance Deferred tax liabilities: Property-related items, including accelerated depreciation Regulatory balancing accounts Unamortized ITC Debt-related costs Intangibles Other Net noncurrent deferred tax liabilities SOUTHWEST GAS HOLDINGS, INC. | 115 2018 2017 $105,791 $ 98,912 39,215 21,603 13,125 2,235 17,215 31,323 4,390 11,460 3,037 13,870 (1,132) (728) 198,052 162,264 678,307 598,371 6,097 368 3,110 7,807 6,067 981 3,380 7,656 30,300 21,289 725,989 637,744 $527,937 $475,480 A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (thousands of dollars): Unrecognized tax benefits at beginning of year Gross increases – tax positions in prior period Gross decreases – tax positions in prior period Gross increases – current period tax positions Gross decreases – current period tax positions Settlements Lapse in statute of limitations Unrecognized tax benefits at end of year Southwest Gas Corporation: 2018 2017 $1,430 — 459 — — — — $1,231 100 — 99 — — — $ 971 $1,430 The following is a summary of income before taxes for continuing and discontinued operations (refer to Note 1 – Background, Organization, and Summary of Significant Accounting Policies) (thousands of dollars): Year ended December 31, Income from continuing operations before income taxes Income from discontinued operations before income taxes Total income before income taxes 2018 2017 2016 $182,833 — $219,953 — $178,007 53,516 $182,833 $219,953 $231,523 116 | SOUTHWEST GAS HOLDINGS, INC. Income tax expense (benefit) consists of the following (thousands of dollars): Year Ended December 31, Current: Federal State Deferred: Federal State Total income tax expense from continuing operations Discontinued operations Total income tax expense 2018 2017 2016 $(17,584) $ (6,783) 318 1,420 $ (9,695) 2,510 (24,367) 1,738 (7,185) 58,136 10,222 60,662 735 66,037 (268) 68,358 61,397 65,769 43,991 — 63,135 58,584 — 19,884 $ 43,991 $63,135 $78,468 Deferred income tax expense (benefit) consists of the following significant components (thousands of dollars): Year Ended December 31, Deferred federal and state: Property-related items Purchased gas cost adjustments Employee benefits Regulatory Adjustments All other deferred Total deferred federal and state Deferred ITC, net Total deferred income tax expense 2018 2017 2016 $67,576 (3,507) 2,156 2,412 334 $49,129 8,500 (5,707) 14,401 (4,197) $ 72,811 361 (139) 6,322 (12,748) 68,971 (613) 62,126 (729) 66,607 (838) $68,358 $61,397 $ 65,769 A reconciliation of the U.S. federal statutory rate to the consolidated effective tax rate for 2018, 2017, and 2016 (and the sources of these differences and the effect of each) are summarized as follows: Year Ended December 31, U.S. federal statutory income tax rate Net state taxes Tax credits Company owned life insurance Change in U.S. Federal Income Tax Rate All other differences Effective income tax rate from continuing operations 2018 2017 2016 21.0% 35.0% 35.0% 0.8 0.6 2.1 (0.5) (0.4) (0.4) 0.3 (1.5) (1.7) — (3.6) — (0.9) (1.2) 1.1 24.1% 28.7% 32.9% Deferred tax assets and liabilities consist of the following (thousands of dollars): December 31, Deferred tax assets: Deferred income taxes for future amortization of ITC and excess deferred taxes Employee benefits Alternative minimum tax credit Net operating losses and credits Interest rate swap Other Valuation allowance Deferred tax liabilities: Property-related items, including accelerated depreciation Regulatory balancing accounts Unamortized ITC Debt-related costs Other Net deferred tax liabilities SOUTHWEST GAS HOLDINGS, INC. | 117 2018 2017 $105,791 $ 98,912 17,337 21,603 4,557 2,235 9,386 18,707 4,390 10,070 3,037 8,820 (37) (58) 160,872 143,878 614,205 561,493 6,097 368 3,110 6,067 981 3,380 27,550 17,200 651,330 589,121 $490,458 $445,243 A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (thousands of dollars): Unrecognized tax benefits at beginning of year Gross increases – tax positions in prior period Gross decreases – tax positions in prior period Gross increases – current period tax positions Gross decreases – current period tax positions Settlements Lapse in statute of limitations Unrecognized tax benefits at end of year 2018 2017 $1,069 — 98 — — — — $ 903 67 — 99 — — — $ 971 $1,069 The Company’s regulated operations accounting for income taxes is impacted by the FASB’s ASC 980 – Regulated Operations. Reductions in accumulated deferred income tax balances due to the reduction in the corporate income tax rates to 21% under the provisions of the TCJA may result in a refund of excess deferred taxes to customers, generally through reductions in future rates. The TCJA includes provisions that stipulate how these excess deferred taxes may be passed back to customers for certain accelerated tax depreciation benefits. Potential refunds of other deferred taxes will be determined in conjunction with appropriate regulatory commissions. As part of the recently concluded Nevada general rate case, excess deferred taxes will begin being refunded to customers starting in January 2019. The December 31, 2018 balance sheets of Southwest and the Company reflect the impact of the TCJA with a recorded regulatory liability of $456 million. 118 | SOUTHWEST GAS HOLDINGS, INC. The Company and its subsidiaries file a consolidated federal income tax return in the U.S. and in various states, as well as in Canada. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or Canadian income tax examinations for years before 2014. The Company and each of its subsidiaries, including Southwest, participate in a tax sharing agreement to establish the method for allocating tax benefits and losses among members of the consolidated group. The consolidated federal income tax is apportioned among the subsidiaries using a separate return method. At December 31, 2018, the Company has a federal net operating loss carryforward of $62.5 million which may be carried forward indefinitely. The Company also has general business credits of $3.5 million, which begin to expire in 2035. The Company has net capital loss carryforwards of $107,000, which will begin to expire in 2019. At December 31, 2018, the Company has an income tax net operating loss carryforward related to Canadian operations of $7.6 million, which begins to expire in 2034. Management intends to continue to permanently reinvest any future foreign earnings in Canada. In assessing whether uncertain tax positions should be recognized in its financial statements, management first determines whether it is more-likely-than-not that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. In evaluations of whether a tax position has met the more-likely-than-not recognition threshold, management presumes that the position will be examined by the appropriate taxing authority that would have full knowledge of all relevant information. For tax positions that meet the more-likely-than-not recognition threshold, management measures the amount of benefit recognized in the financial statements at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. Unrecognized tax benefits are recognized in the first financial reporting period in which information becomes available indicating that such benefits will more-likely-than-not be realized. For each reporting period, management applies a consistent methodology to measure unrecognized tax benefits, and all unrecognized tax benefits are reviewed periodically and adjusted as circumstances warrant. Measurement of unrecognized tax benefits is based on management’s assessment of all relevant information, including prior audit experience, the status of audits, conclusions of tax audits, lapsing of applicable statutes of limitation, identification of new issues, and any administrative guidance or developments. At December 31, 2018, the total amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate was $1 million individually for both the Company and Southwest. No significant increases or decreases in unrecognized tax benefit are expected within the next 12 months. The Company and Southwest recognize interest expense and income and penalties related to income tax matters in income tax expense. There was no tax-related interest income for 2018, 2017, and 2016. Note 14 – Derivatives Derivatives. In managing its natural gas supply portfolios, Southwest has historically entered into fixed- and variable-price contracts, which qualify as derivatives. Additionally, Southwest utilizes fixed-for-floating swap contracts (“Swaps”) to supplement its fixed-price contracts. The fixed-price contracts, firm commitments to purchase a fixed amount of gas in the future at a fixed price, qualify for the normal purchases and normal sales exception that is allowed for contracts that are probable of delivery in the normal course of business, and are exempt from fair value reporting. The variable-price contracts qualify as derivative instruments; however, because the contract price is the prevailing price at the future transaction date, the contract has no determinable fair value. The Swaps’ contract prices are determined at the beginning of each month to reflect that month’s published first of month index price and are recorded at fair value. Southwest does not utilize derivative financial instruments for speculative purposes, nor does it have trading operations. SOUTHWEST GAS HOLDINGS, INC. | 119 The fixed-price contracts and Swaps are utilized by Southwest under its volatility mitigation programs to effectively fix the price on a portion (up to 25% in the Arizona and California jurisdictions) of its natural gas supply portfolios. The maturities of the Swaps highly correlate to forecasted purchases of natural gas, during time frames ranging from January 2019 through October 2020. Under such contracts, Southwest pays the counterparty a fixed rate and receives from the counterparty a floating rate per MMBtu (“dekatherm”) of natural gas. Only the net differential is actually paid or received. The differential is calculated based on the notional amounts under the contracts, which are detailed in the table below (thousands of dekatherms): Contract notional amounts December 31, 2018 December 31, 2017 13,387 10,929 The following table sets forth the gains and (losses) recognized on Southwest’s Swaps (derivatives) for the years ended December 31, 2018, 2017, and 2016 and their location in the Consolidated Statements of Income: Instrument Swaps Swaps Total Location of Gain or (Loss) Recognized in Income on Derivative Net cost of gas sold Net cost of gas sold 2018 2017 2016 $(2,113) 2,113* $(11,572) 11,572* $ 5,006 (5,006)* $ — $ — $ — * Represents the impact of regulatory deferral accounting treatment under U.S. GAAP for rate-regulated entities. No gains (losses) were recognized in net income or other comprehensive income during the periods presented for derivatives designated as cash flow hedging instruments. Previously, Southwest entered into two forward-starting interest rate swaps (“FSIRS”), both of which were designated cash flow hedges, to partially hedge the risk of interest rate variability during the period leading up to the planned issuance of debt. The first FSIRS terminated in December 2010, and the second, in March 2012. Losses on both FSIRS are being amortized over ten-year periods from Accumulated other comprehensive income (loss) into interest expense. The following table sets forth the fair values of the Swaps and their location in the Consolidated Balance Sheets of Southwest and the Company (thousands of dollars). Fair values of derivatives not designated as hedging instruments: December 31, 2018 Instrument Balance Sheet Location Swaps Swaps Swaps Total December 31, 2017 Instrument Swaps Swaps Total Prepaid and other current assets Other current liabilities Other deferred credits Balance Sheet Location Deferred charges and other assets Prepaid and other current assets Asset Derivatives Liability Derivatives Net Total $ 243 1,595 141 $ (99) (3,347) (251) $ 144 (1,752) (110) $1,979 $(3,697) $(1,718) Asset Derivatives Liability Derivatives Net Total $ $ 11 19 30 $(4,468) (1,342) $(4,457) (1,323) $(5,810) $(5,780) 120 | SOUTHWEST GAS HOLDINGS, INC. The estimated fair values of the natural gas derivatives were determined using future natural gas index prices (as more fully described below). Master netting arrangements exist with each counterparty that provide for the net settlement (in the settlement month) of all contracts through a single payment. As applicable, management has elected to reflect the net amounts in its balance sheets. No outstanding collateral associated with the Swaps existed during any period presented in the above table. Pursuant to regulatory deferral accounting treatment for rate-regulated entities, unrealized gains and losses in fair value of the Swaps are recorded as a regulatory asset and/or liability. When the Swaps mature, any prior positions held are reversed and the settled position is recorded as an increase or decrease of purchased gas under the related PGA mechanism in determining deferred PGA balances. Neither changes in fair value, nor settled amounts, of Swaps have a direct effect on earnings or other comprehensive income. The following table presents the amounts paid to and received from counterparties for settlements of matured Swaps. (Thousands of dollars) Paid to counterparties Received from counterparties Year ended December 31, 2018 Year ended December 31, 2017 Year ended December 31, 2016 $6,781 $ 606 $3,100 $1,685 $5,583 $ 726 The following table details the regulatory assets/(liabilities) offsetting the derivatives at fair value in the Consolidated Balance Sheets (thousands of dollars). December 31, 2018 Instrument Swaps Swaps Swaps December 31, 2017 Instrument Swaps Swaps Balance Sheet Location Other current liabilities Prepaid and other current assets Deferred charges and other assets Balance Sheet Location Prepaid and other current assets Deferred charges and other assets Net Total $ (144) 1,752 110 Net Total $4,457 1,323 Fair Value Measurements. The estimated fair values of Southwest’s Swaps were determined at December 31, 2018 and December 31, 2017 using futures settlement prices, published by the CME Group, for the delivery of natural gas at Henry Hub adjusted by the prices of basis future settlements, which reflect the difference between the price of natural gas at a given delivery basin and the Henry Hub pricing points. These Level 2 inputs are observable in the marketplace throughout the full term of the Swaps, but have been credit-risk adjusted with no significant impact to the overall fair value measurement. The following table sets forth, by level within the three-level fair value hierarchy that ranks the inputs used to measure fair value by their reliability, financial assets and liabilities that were accounted for at fair value: SOUTHWEST GAS HOLDINGS, INC. | 121 Level 2 – Significant other observable inputs (Thousands of dollars) Assets at fair value: Prepaid and other current assets – Swaps Deferred charges and other assets – Swaps Liabilities at fair value: Other current liabilities – Swaps Other deferred credits – Swaps Net Assets (Liabilities) December 31, 2018 December 31, 2017 $ 144 — (1,752) (110) $(1,718) $ — — (4,457) (1,323) $(5,780) No financial assets or liabilities associated with the Swaps, which were accounted for at fair value, fell within Level 1 or Level 3 of the fair value hierarchy. Note 15 – Segment Information The Company’s operating segments are determined based on the nature of their activities. The natural gas operations segment is engaged in the business of purchasing, distributing, and transporting natural gas. Revenues are generated from the distribution and transportation of natural gas. The utility infrastructure services segment is primarily engaged in the business of providing utility companies with trenching and installation, replacement, and maintenance services for energy distribution systems, and providing industrial construction solutions. Although our utility infrastructure services operations are geographically dispersed, they are aggregated and reported as a single segment as each reporting unit has similar economic characteristics. Over 99% of the total Company’s long-lived assets are in the U.S. The accounting policies of the reported segments are the same as those described within Note 1 – Background, Organization, and Summary of Significant Accounting Policies. Centuri accounts for the services provided to Southwest at contractual prices at contract inception. Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below (in thousands). Accounts receivable for Centuri services December 31, 2018 December 31, 2017 $18,830 $12,987 The following table presents the amount of revenues for both segments by geographic area (thousands of dollars): Revenues (a) United States Canada Total (a) Revenues are attributed to countries based on the location of customers. December 31, 2018 December 31, 2017 December 31, 2016 $2,664,670 215,343 $2,345,134 203,658 $2,256,600 203,890 $2,880,013 $2,548,792 $2,460,490 122 | SOUTHWEST GAS HOLDINGS, INC. The Company has two reportable segments: natural gas operations and utility infrastructure services. Southwest has a single reportable segment that is referred to herein as the natural gas operations segment of the Company. In order to reconcile to net income as disclosed in the Consolidated Statements of Income, an Other column is included associated with impacts related to corporate and administrative activities related to Southwest Gas Holdings, Inc. The financial information pertaining to the natural gas operations and utility infrastructure services segments for each of the three years in the period ended December 31, 2018 is as follows (thousands of dollars): 2018 Revenues from unaffiliated customers Intersegment sales Total Interest revenue Interest expense Depreciation and amortization Income tax expense Segment net income Segment assets Capital expenditures 2017 Revenues from unaffiliated customers Intersegment sales Total Interest revenue Interest expense Depreciation and amortization Income tax expense Segment net income Segment assets Capital expenditures 2016 Revenues from unaffiliated customers Intersegment sales Total Interest revenue Interest expense Depreciation and amortization Income tax expense Segment net income Segment assets Capital expenditures Gas Operations $1,357,728 — $1,357,728 $ $ 6,020 81,740 $ 191,816 $ 43,991 $ 138,842 Utility Infrastructure Services $1,386,371 135,914 $1,522,285 Total Other $ — $2,744,099 135,914 $ — $2,880,013 — $ $ $ $ $ 88 $ — $ 6,108 14,190 $ 741 $ 96,671 57,396 $ — $ 249,212 18,420 $ (727) $ 61,684 44,977 $(1,542) $ 182,277 $6,141,584 $1,215,573 $ 572 $7,357,729 $ 682,869 $ 83,045 $ — $ 765,914 Gas Operations $1,302,308 — $1,302,308 $ $ 2,784 69,733 $ 201,922 $ 63,135 $ 156,818 Utility Infrastructure Services $1,149,325 97,159 $1,246,484 Total Other $ — $2,451,633 97,159 $ — $2,548,792 — $ $ $ $ $ 3 $ — $ 2,787 7,986 $ 345 $ 78,064 49,029 $ — $ 250,951 2,390 $ (437) $ 65,088 38,360 $(1,337) $ 193,841 $5,482,669 $ 752,496 $ 1,901 $6,237,066 $ 560,448 $ 63,201 $ — $ 623,649 Gas Operations $1,321,412 — $1,321,412 $ $ 1,848 66,997 $ 233,463 $ 58,584 $ 119,423 Utility Infrastructure Services $1,040,957 98,121 $1,139,078 Total Other $ — $2,362,369 98,121 $ — $2,460,490 — $ $ $ $ $ 1 $ — $ 1,849 6,663 $ — $ 73,660 55,669 $ — $ 289,132 19,884 $ — $ 78,468 32,618 $ — $ 152,041 $5,001,756 $ 579,370 $ — $5,581,126 $ 457,120 $ 72,411 $ — $ 529,531 Note 16 – Quarterly Financial Data (Unaudited) (Thousands of dollars, except per share amounts) 2018 Southwest Gas Holdings, Inc.: Operating revenues Operating income (4) Net income Net income attributable to Southwest Gas Holdings, Inc. Basic earnings per common share (1) Diluted earnings per common share (1) Southwest Gas Corporation: Operating revenues Operating income (4) Net income (loss) 2017 Southwest Gas Holdings, Inc.: Operating revenues Operating income (4) Net income Net income attributable to Southwest Gas Holdings, Inc. Basic earnings per common share (1) Diluted earnings per common share (1) Southwest Gas Corporation: Operating revenues Operating income (4) Net income (loss) 2016 Southwest Gas Holdings, Inc.: (2) Operating revenues Operating income (4) Net income (loss) Net income attributable to Southwest Gas Holdings, Inc. Basic earnings per common share (1) Diluted earnings per common share (1) Southwest Gas Corporation: (2) (3) Operating revenues Continuing operations Discontinued operations – utility infrastructure services Total SOUTHWEST GAS HOLDINGS, INC. | 123 Quarter Ended March 31 June 30 September 30 December 31 $754,330 129,560 78,294 79,091 1.63 1.63 $670,883 53,338 21,551 21,551 0.44 0.44 $668,146 39,681 12,331 12,331 0.25 0.25 $494,313 141,173 90,349 $275,679 24,675 2,622 $217,523 3 (13,670) $654,737 124,347 69,005 69,308 1.46 1.45 $560,469 48,265 18,121 17,864 0.38 0.37 $593,153 34,988 10,420 10,204 0.21 0.21 $462,602 135,922 76,938 $260,162 32,346 9,522 $213,059 9,921 (4,024) $731,248 139,036 75,355 75,446 1.59 1.58 $547,748 33,057 9,099 8,943 0.19 0.19 $539,969 20,478 2,907 2,472 0.05 0.05 $786,654 134,854 131,160 69,304 1.36 1.36 $370,213 115,962 59,541 $740,433 135,524 96,396 96,465 2.00 2.00 $366,485 117,885 74,382 $641,525 122,903 65,694 65,180 1.37 1.36 $525,100 206,148 $255,648 292,100 $200,179 339,790 $340,485 301,040 $731,248 $547,748 $539,969 $641,525 124 | SOUTHWEST GAS HOLDINGS, INC. Operating income (loss) (4) Continuing operations Discontinued operations – utility infrastructure services Total Net income (loss) Continuing operations Discontinued operations – utility infrastructure services Total Quarter Ended March 31 June 30 September 30 December 31 $140,885 (1,849) $20,210 12,847 $ (5,292) 25,770 $100,685 22,218 $139,036 $33,057 $ 20,478 $122,903 $ 77,583 (2,137) $ 2,358 6,585 $(12,405) 14,877 $ 51,887 13,293 $ 75,446 $ 8,943 $ 2,472 $ 65,180 (1) The sum of quarterly earnings (loss) per average common share may not equal the annual earnings (loss) per share due to the ongoing change in the weighted-average number of common shares. (2) Refer to Notes 1 and 18. Effective 2017, Southwest Gas Holdings, Inc. (“Company) is the successor equity issuer to Southwest Gas Corporation (“Southwest”). Both Southwest and Centuri became subsidiaries of the Company. (3) Periods prior to 2017 depict Centuri amounts as discontinued operations of Southwest. (4) Periods prior to 2018 depict revised operating income for the reclassification of non-service components of net periodic benefit costs, associated with pensions and other post-retirement benefits, out of the operations and maintenance line item of both the Company’s and Southwest’s Condensed Consolidated Statements of Income due to the adoption of ASU 2017-07. The resultant figures for Operating income, but not Net income, were increased accordingly to reflect reclassification. See Note 11 – Pension and Other Postretirement Benefits for further information relating to the adoption of this update. The demand for natural gas is seasonal, and it is the opinion of management that comparisons of earnings for interim periods do not reliably reflect overall trends and changes in operations. Also, the timing of general rate relief can have a significant impact on earnings for interim periods. Note 17 – Utility Infrastructure Services Noncontrolling Interests In conjunction with the acquisition of the Canadian utility infrastructure services businesses in October 2014, the previous owners of the acquired companies retained a 3.4% equity interest in Centuri, which, subject to an eligibility timeline, would have been redeemable (in its entirety) at the election of the noncontrolling parties beginning in July 2022. In August 2017, in advance of when otherwise eligible, the parties agreed to a redemption. Southwest Gas Holdings, Inc. paid $23 million to the previous owners, thereby acquiring the remaining 3.4% equity interest in Centuri. Accordingly, Centuri is now a wholly owned subsidiary of the Company. In connection with the acquisition of Linetec in November 2018, the previous owner retained a 20% equity interest in Linetec, subject to certain rights based on the passage of time or upon the occurrence of certain triggering events. Effective January 2022, the Company has the right, but not the obligation, to purchase at fair value (subject to a floor) a portion of the interest held by the noncontrolling party, and in incremental amounts each year thereafter. The shares subject to the election cumulate (if earlier elections are not made) such that 100% of the interest retained by the noncontrolling party is subject to the election beginning in 2024. If the Company does not exercise its rights at each or any of the specified intervals, the noncontrolling party has the ability, but not the obligation, to exit their investment retained by requiring Centuri to purchase a similar portion of their interest up to the maximum cumulative amounts specified and at each interval discussed above. The outstanding noncontrolling interest is not subject to minimum purchase provisions and following the eligibility dates for the elections, they do not expire. The redemption price represents SOUTHWEST GAS HOLDINGS, INC. | 125 the greater of fair value of the ownership interest to be redeemed on the redemption date or a floor amount under the terms of the agreement. The Company has determined that this noncontrolling interest is a redeemable noncontrolling interest and, in accordance with SEC guidance, is classified as mezzanine equity (temporary equity) in the Company’s Consolidated Balance Sheets. As of November 30, 2018, the redeemable noncontrolling interest was reported at its estimated fair value of $81.7 million. The fair value was estimated using a market approach that utilizes certain financial metrics from guideline public companies of similar industry and operating characteristics; however, no significant change in the fair value occurred through December 31, 2018. Changes in the value of the redeemable noncontrolling interest will be recognized as they occur and the carrying value will be adjusted accordingly at each quarterly reporting date. Generally, adjustments to the redemption value are expected to impact retained earnings, but not net income. The following depicts changes to the balance of the redeemable noncontrolling interest between the indicated periods. (Thousands of dollars): Balance, December 31, 2016 Net Income (loss) attributable to redeemable noncontrolling interest Foreign currency exchange translation adjustment Centuri distribution to redeemable noncontrolling interest Adjustment to redemption value Redemption of Centuri shares from noncontrolling parties Balance, December 31, 2017 Redeemable noncontrolling interest acquired Net income attributable to redeemable noncontrolling interest Balance, December 31, 2018 Redeemable Noncontrolling Interest $ 22,590 248 11 (204) 355 (23,000) — 81,659 172 $ 81,831 Centuri also holds a 95% interest in a venture to market natural gas engine-driven heating, ventilating, and air conditioning technology and products. Centuri consolidates the entity (IntelliChoice Energy, LLC) as a majority-owned subsidiary. The interest is immaterial to the consolidated financial statements, but is identified as the Noncontrolling interest within Total equity on the Company’s Consolidated Balance Sheets. Note 18 – Reorganization Impacts – Discontinued Operations Solely Related to Southwest Gas Corporation In association with the January 2017 holding company reorganization, no substantive change occurred with regard to the Company’s business segments on the whole. Centuri operations remain part of continuing operations of the controlled group of companies, and financial information related to Centuri continues to be included in the consolidated financial statements of the Company. While Centuri has since expanded its footprint with the Linetec and Neuco acquisitions (See Note 19 – Business Acquisitions), its core business has remained consistent. As part of the holding company reorganization, however, Centuri is no longer a subsidiary of Southwest; whereas historically, Centuri had been a direct subsidiary of Southwest. To give effect to this change, the consolidated financial statements related to Southwest, which are separately included in this report, depict Centuri-related amounts as discontinued operations for periods prior to January 2017. 126 | SOUTHWEST GAS HOLDINGS, INC. Due to the discontinued operations accounting reflection, the following table presents the major income statement components of discontinued operations – utility infrastructure services reported in the Consolidated Income Statements of Southwest for the period prior to the beginning of 2017: Results of Utility Infrastructure Services (Thousands of dollars) Utility infrastructure services revenues Operating expenses: Utility infrastructure services expenses Depreciation and amortization Operating income Other income (deductions) Net interest deductions Income before income taxes Income tax expense Net income Net income attributable to noncontrolling interests Year Ended December 31, 2016 $1,139,078 1,024,423 55,669 58,986 1,193 6,663 53,516 19,884 33,632 1,014 Discontinued operations – utility infrastructure services – net income $ 32,618 Note 19 – Business Acquisitions As indicated in Note 1 – Background, Organization, and Summary of Significant Accounting Policies, on November 30, 2018, the Company, through its subsidiaries, led principally by Centuri, completed the acquisition of an 80% interest in a privately held utility infrastructure services business, Linetec Services, LLC (“Linetec”) for approximately $326.6 million, with the remaining 20% retained by the seller. The above figure includes unremitted amounts as of the closing date as follows: $30 million associated with the subsequent collection of Linetec unbilled customer receivable balances recorded at their estimated realizable values as of the acquisition date, $29.6 million of seller liabilities related to future payments to certain Linetec employees, and $16.9 million representing consideration held back for estimated purchase price and working capital adjustments to be paid during 2019. Additionally, $24.1 million of consideration transferred related to future estimated tax payments related to a mutual 338(h)(10) election under U.S. Treasury regulations (deemed asset sale/purchase under those tax regulations). In December 2018, $25 million of the $29.6 million referred to above was paid to certain Linetec employees. The acquisition will extend the utility services operations in the southeastern region of the U.S. and provide additional opportunities for expansion of the amount of work Centuri performs for electric utilities. Funding for the acquisition was provided by a portion of net proceeds from the Company’s equity offering in November 2018 and from Centuri’s $590 million secured revolving credit and term loan facility, as amended, described below and in Note 7 – Common Stock and Note 8 – Long-Term Debt. The Company is currently performing a detailed valuation analysis of the assets and liabilities of the acquired company, which was substantially completed during the fourth quarter of 2018. Certain payments were estimated as of the acquisition date and will be adjusted when finally paid in 2019. The necessary analysis will consider acquired intangibles including customer relationships, trade names, and customer contracts. Based on preliminary results, a substantial majority of the purchase price will be allocated to goodwill and other finite-lived intangible assets. SOUTHWEST GAS HOLDINGS, INC. | 127 Assets acquired and liabilities assumed in the transaction were recorded, generally, at their acquisition date fair values. Transaction costs associated with the acquisition were expensed as incurred. The Company’s allocation of the purchase price was based on an evaluation of the appropriate fair values and represented management’s best estimate based on available data (including market data, data regarding customers of the acquired businesses, terms of acquisition-related agreements, analysis of historical and projected results, and other types of data). The analysis included consideration of types of intangibles that were acquired, including customer relationships, trade names, and customer contracts. The final purchase accounting has not yet been completed. Further refinement is expected to occur, including potential changes to income taxes and intangibles, as well as additional consideration payments held back. The preliminary estimated fair values of assets acquired and liabilities assumed as of November 30, 2018, are as follows (in millions of dollars): Cash and cash equivalents Accounts receivable Revenue earned on contracts in progress in excess of billings Prepaid expenses and other current assets Property and equipment Intangible assets Goodwill Total assets acquired Accounts payable Accrued liabilities Deferred compensation and related accrued taxes Redeemable noncontrolling interest Total liabilities assumed and noncontrolling interest Net assets acquired $ 3.9 32.8 21.6 1.1 89.4 89.3 188.5 426.6 8.0 6.9 3.4 81.7 100.0 $326.6 Goodwill consists of the value associated with the assembled workforce, consolidation of operations, and the estimated economic value attributable to future opportunities related to the transaction. As the business of Linetec was deemed an asset purchase for tax purposes, the $188.5 million of tax-basis goodwill is expected to be deductible for tax purposes. As of the acquisition date, other intangible assets totaled $89.3 million which will be amortized over a weighted-average life of 19 years. Of the $89.3 million of intangible assets, $79 million is attributable to customer relationships with an assigned life of 20 years, $10 million is attributable to a trade name with a 15-year useful life, and $300,000 is attributable to customer contracts with a useful life of one year. The intangible assets other than goodwill are included in Other property and investments in the Company’s Consolidated Balance Sheets. The unaudited pro forma consolidated financial information for fiscal 2018 and fiscal 2017 (assuming the acquisition of Linetec occurred as of the beginning fiscal 2017) is as follows (in thousands of dollars, except per share amounts): Total operating revenues Net income attributable to Southwest Gas Holdings, Inc. Basic earnings per share Diluted earnings per share Year Ended December 31, 2018 2017 $3,037,209 $ 187,642 3.80 $ 3.79 $ $2,626,721 $ 192,368 4.01 $ 4.01 $ 128 | SOUTHWEST GAS HOLDINGS, INC. Acquisition costs of $6.9 million that were incurred during 2018, and included in Utility infrastructure expenses in the Consolidated Statements of Income, were excluded from the 2018 unaudited pro forma consolidated financial information shown above and included in the 2017 amounts. No material nonrecurring pro forma adjustments directly attributable to the business combination were included in the unaudited pro forma consolidated financial information. The pro forma financial information includes assumptions and adjustments made to incorporate various items including, but not limited to, additional interest expense and depreciation and amortization expense, and tax effects, as appropriate. The pro forma financial information has been prepared for comparative purposes only, and is not intended to be indicative of what the Company’s results would have been had the acquisition occurred at the beginning of the periods presented or of the results which may occur in the future, for a number of reasons. These reasons include, but are not limited to, differences between the assumptions used to prepare the pro forma information, potential cost savings from operating efficiencies, and the impact of incremental costs incurred in integrating the businesses. Actual results from Linetec operations, excluding transaction costs incurred by Centuri, included in the Consolidated Statements of Income since the date of acquisition are as follows (in thousands of dollars): Utility infrastructure services revenues Net income attributable to Southwest Gas Holdings, Inc. Year ended December 31, 2018 $14,119 690 In November 2017, the Company, through its subsidiaries, led principally by Centuri, completed the acquisition of Neuco, a privately held utility infrastructure services business, for approximately $99 million, less assumed debt. The acquisition extended the utility infrastructure services to the Northeastern region of the U.S., and provided additional opportunities for expansion. Funding for the acquisition was primarily provided by Centuri’s revolving credit and term loan facilities, described in Note 8 – Long-Term Debt. Assets acquired and liabilities assumed in the transaction were recorded, generally, at their acquisition date fair values. Transaction costs associated with the acquisition were expensed as incurred. The Company’s allocation of the purchase price was based on an evaluation of the appropriate fair values and represented management’s best estimate based on available data (including market data, data regarding customers of the acquired businesses, terms of acquisition-related agreements, analysis of historical and projected results, and other that were acquired, including non-competition agreements, customer relationships, trade names, and work backlog. The final purchase accounting has been completed. types of data). The analysis included consideration of intangibles types of The fair values of assets acquired and liabilities assumed as of November 1, 2017, the acquisition date, were as follows (in millions of dollars): SOUTHWEST GAS HOLDINGS, INC. | 129 Cash and cash equivalents Contracts receivable Other receivables Property, plant and equipment Prepaid expenses and deposits Intangible assets Goodwill Total assets acquired Current liabilities Other long-term liabilities Net assets acquired $ 0.8 18.3 5.4 15.1 1.6 44.8 32.2 118.2 (18.6) (0.3) $ 99.3 The allocation of the purchase price of Neuco was accounted for in accordance with applicable accounting guidance. Goodwill, which is generally not deductible for tax purposes, consists of the value associated with the assembled workforce and consolidation of operations. However, as the business of Neuco was acquired via asset purchase for tax purposes, the approximately $32 million of tax-basis goodwill is expected to be deductible for tax purposes. Following a one-year post-acquisition measurement period, the values were adjusted as reflected in the table above, with no significant overall impact to the Company’s consolidated balance sheets. The unaudited pro forma consolidated financial information for fiscal 2017 is as follows (in thousands of dollars, except per share amounts): Total operating revenues Net income attributable to Southwest Gas Holdings, Inc. Basic earnings per share Diluted earnings per share Year Ended December 31, 2017 $2,639,452 $ 203,245 4.24 $ 4.24 $ The pro forma financial information includes assumptions and adjustments made to incorporate various items including, but not limited to, additional interest expense and depreciation and amortization expense, and tax effects, as appropriate. The pro forma financial information has been prepared for comparative purposes only, and is not intended to be indicative of what the Company’s results would have been had the acquisition occurred at the beginning of the periods presented or of the results which may occur in the future, for a number of reasons. These reasons include, but are not limited to, differences between the assumptions used to prepare the pro forma information, potential cost savings from operating efficiencies, and the impact of incremental costs incurred in integrating the businesses. The Company incurred and expensed acquisition costs of $2.6 million related to the acquisition. No acquisition-related costs were incurred during 2018. 130 | SOUTHWEST GAS HOLDINGS, INC. MANAGEMENT’S REPORTS ON INTERNAL CONTROL OVER FINANCIAL REPORTING Management of Southwest Gas Holdings, Inc. is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined by Rule 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. See Item 9A Controls and Procedures of the 2018 Form 10-K for a discussion regarding the scope of management’s assessment due to the recent acquisition of Linetec Services, LLC, which is excluded from management’s report on internal control over financial reporting. Existing assets of the acquired business represents 2% of consolidated total assets and 1% of consolidated revenues for the year ended December 31, 2018 and is not significant to the Company’s consolidated financial statements. Under the supervision and with the participation of Southwest Gas Holdings, Inc. management, including the principal executive officer and principal financial officer, an evaluation was conducted of the effectiveness of internal control over financial reporting based on the “InternalControl–IntegratedFramework” (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based upon management’s evaluation under such framework, management concluded that the internal control over financial reporting was effective as of December 31, 2018. The effectiveness of reporting as of December 31, 2018 has been audited by PricewaterhouseCoopers, LLP, an independent registered public accounting firm, as stated in their report which is included herein. internal control over financial Management of Southwest Gas Corporation 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. Under the supervision and with the participation of Southwest Gas Corporation management, including the principal executive officer and principal financial officer, an evaluation was conducted of the effectiveness of internal control over financial reporting based on the “InternalControl–Integrated Framework”(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based upon management’s evaluation under such framework, management concluded that Southwest Gas Corporation’s internal control over financial reporting was effective as of December 31, 2018. This annual report does not include an attestation report of Southwest Gas Corporation’s registered public accounting firm regarding internal control over financial reporting pursuant to rules of the Securities and Exchange Commission that permit Southwest Gas Corporation to provide only this management’s report in this annual report. February 28, 2019 SOUTHWEST GAS HOLDINGS, INC. | 131 Report of Independent Registered Public Accounting Firm To the Board of Directors and Stockholders of Southwest Gas Holdings, Inc. OpinionsontheFinancialStatementsandInternalControloverFinancialReporting We have audited the accompanying consolidated balance sheets of Southwest Gas Holdings, Inc. and its subsidiaries (the “Company”) as of December 31, 2018 and December 31, 2017, and the related consolidated statements of income, comprehensive income, equity and redeemable noncontrolling interest, and cash flows for each of the three years in the period ended December 31, 2018, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in InternalControl–IntegratedFramework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and December 31, 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in InternalControl–IntegratedFramework(2013) issued by the COSO. BasisforOpinions The Company’s management is responsible for these consolidated financial statements, 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 the Company’s consolidated financial statements and on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. 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. As described in Management’s Report on Internal Control over Financial Reporting, management has excluded Linetec Services, LLC from its assessment of internal control over financial reporting as of December 31, 2018 because it was acquired by the Company in a 132 | SOUTHWEST GAS HOLDINGS, INC. purchase business combination during 2018. We have also excluded Linetec Services, LLC from our audit of internal control over financial reporting. Linetec Services, LLC is a majority-owned subsidiary whose total assets and total revenues excluded from management’s assessment and our audit of internal control over financial reporting represent 2% and 1%, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2018. DefinitionandLimitationsofInternalControloverFinancialReporting 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 Las Vegas, Nevada February 28, 2019 We have served as the Company or its predecessor’s auditor since 2002. SOUTHWEST GAS HOLDINGS, INC. | 133 Report of Independent Registered Public Accounting Firm To the Board of Directors and Stockholder of Southwest Gas Corporation OpinionontheFinancialStatements We have audited the accompanying consolidated balance sheets of Southwest Gas Corporation and its subsidiaries (the “Company”) as of December 31, 2018 and December 31, 2017, and the related consolidated statements of income, comprehensive income, equity, and cash flows for each of the three years in the period ended December 31, 2018, including the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and December 31, 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018 in conformity with accounting principles generally accepted in the United States of America. Basis for Opinion These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits of these consolidated financial statements in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion. /s/PricewaterhouseCoopers LLP Las Vegas, Nevada February 28, 2019 We have served as the Company’s auditor since 2002. 134 | SOUTHWEST GAS HOLDINGS, INC. [THIS PAGE INTENTIONALLY LEFT BLANK] [THIS PAGE INTENTIONALLY LEFT BLANK] BOARD OF DIRECTORS AND OFFICERS Eric DeBonis Senior Vice President/Operations Southwest Gas Corporation Gregory J. Peterson Senior Vice President/ Chief Financial Officer Southwest Gas Holdings, Inc. Southwest Gas Corporation Anita M. Romero Senior Vice President/ Staff Operations and Technology Southwest Gas Corporation Lori L. Colvin Vice President/Controller/ Chief Accounting Officer Southwest Gas Holdings, Inc. Southwest Gas Corporation Kenneth J. Kenny Vice President/Finance/Treasurer Southwest Gas Holdings, Inc. Southwest Gas Corporation Paul M. Daily President and Chief Executive Officer Centuri Construction Group, Inc. Michael J. Melarkey Reno, Nevada Chairman of the Board Southwest Gas Holdings, Inc. Retired Partner Avansino, Melarkey, Knobel, Mulligan & McKenzie A. Randall Thoman Las Vegas, Nevada Retired Partner Deloitte & Touche LLP Thomas A. Thomas Las Vegas, Nevada Managing Partner Thomas & Mack Co. LLC Leslie T. Thornton* Alexandria, Virginia Retired Executive WGL Holdings, Inc. & Washington Gas Light Company OFFICERS John P. Hester President and Chief Executive Officer Southwest Gas Holdings, Inc. Southwest Gas Corporation Chairman of the Board Centuri Construction Group, Inc. Karen S. Haller Executive Vice President/Chief Legal and Administrative Officer and Corporate Secretary Southwest Gas Holdings, Inc. Southwest Gas Corporation Justin L. Brown Senior Vice President/ General Counsel Southwest Gas Corporation DIRECTORS Robert L. Boughner Las Vegas, Nevada Private Investor Retired Gaming Executive José A. Cárdenas Tempe, Arizona Senior Vice President and General Counsel Arizona State University Thomas E. Chestnut Coronado, California Retired Construction Executive Stephen C. Comer Las Vegas, Nevada Retired Managing Partner Deloitte & Touche LLP LeRoy C. Hanneman Jr. Phoenix, Arizona Private Investor Retired Construction Executive John P. Hester President and Chief Executive Officer Southwest Gas Holdings, Inc. Jane Lewis-Raymond* Charlotte, North Carolina Counsel Parker Poe Adams & Bernstein LLP Retired Executive Piedmont Natural Gas Company, Inc. Anne L. Mariucci Phoenix, Arizona Private Investor Retired Real Estate Development and Homebuilding Executive *Director as of January 1, 2019 SHAREHOLDER INFORMATION Auditors PricewaterhouseCoopers LLP 3800 Howard Hughes Parkway Suite 650 Las Vegas, NV 89169-5906 Forward-looking Statements This Annual Report contains forward-looking statements regarding the Company’s current expectations. These statements are subject to a variety of risks that could cause actual results to differ materially from expectations. These risks and uncertainties include, in addition to those discussed herein, all factors discussed in the Company’s Annual Report on Form 10-K for the year 2018. Stock Listing Information Southwest Gas Holdings, Inc. (Company) common stock is listed on the New York Stock Exchange under the ticker symbol “SWX.” Quotes may be obtained in daily financial newspapers or some local newspapers where it is sometimes listed under “SoWestGas,” or on our website at www.swgasholdings.com. Dividend Reinvestment and Stock Purchase Plan Our Dividend Reinvestment and Stock Purchase Plan provides investors with a simple and convenient method of purchasing the Company’s common stock and investing cash dividends in additional shares without payment of brokerage commissions. Investor Relations The Company is committed to providing relevant and complete investment information to shareholders, individual investors and members of the investment community. Copies of the 2018 Annual Report on Form 10-K, without exhibits, as filed with the Securities and Exchange Commission may be obtained from our Corporate Secretary upon request free of charge. Additional requests of a financial nature should be directed to: Kenneth J. Kenny Investor Relations Southwest Gas Holdings, Inc. P.O. Box 98510 Las Vegas, NV 89193-8510 or call 702-876-7237 For more information contact: EQ Shareowner Services P.O. Box 64856 St. Paul, MN 55164-0874 or call 1-800-331-1119 Additional Company information is available at: www.swgasholdings.com For non-financial information call 702-876-7011. Dividends Dividends on common stock are typically declared quarterly by the Board of Directors and are generally payable on the first day of March, June, September and December. Transfer Agent and Registrar EQ Shareowner Services P.O. Box 64874 St. Paul, MN 55164-9942 FUTURE FUTURE S S O O U U T T H H W W E E S S T T G G A A S S H H O O L L D D I I N N G G S S , , I I N N C C . . 2 2 0 0 1 1 8 8 A A N N N N U U A A L L R R E E P P O O R R T T FOCUSED FOCUSED WWW.SWGASHOLDINGS.COM WWW.SWGASHOLDINGS.COM 2 0 1 8 A N N U A L R E P O R T 2 0 1 8 A N N U A L R E P O R T 

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