Southwest Gas Holdings Inc.

02/25/2026 | Press release | Distributed by Public on 02/25/2026 07:28

Annual Report for Fiscal Year Ending December 31, 2025 (Form 10-K)

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Southwest Gas Holdings is a holding company that owns all of the shares of common stock of Southwest Gas; until April 22, 2024, all of the shares of common stock of Centuri; and until February 14, 2023, all of the shares of common stock of MountainWest. The Company's businesses were managed within three separate reportable segments until February 2023, our Natural Gas Distribution segment (Southwest Gas), our Utility Infrastructure Services segment (Centuri), and our Pipeline and Storage segment (MountainWest). After February 2023 and until August 2025, the businesses were managed within two reportable segments, our Natural Gas Distribution segment (Southwest Gas) and our Utility Infrastructure Services segment (Centuri). After the deconsolidation of Centuri in August 2025, our business is solely comprised of our Natural Gas Distribution segment.
Consistent with the Company's earlier determination to simplify the Company's portfolio of businesses, the Company completed the Centuri IPO in April 2024. From the Centuri IPO and through September 2025, the Company completed a series of sales of its remaining interests in Centuri. The Company completed subsequent sales of Centuri stock in May through September 2025. Following the August, 11, 2025 transaction, the Company owned 30.9% of Centuri, at which time it no longer had a financial controlling interest in Centuri and therefore met the requirements for deconsolidation. On September 5, 2025, the Company sold its remaining shares of Centuri common stock and no longer owns any shares of Centuri nor has any governance rights afforded to it under the Separation Agreement.
Our business includes Southwest Gas, which is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Southwest Gas is the largest regulated distributor of natural gas in Arizona and Nevada, and also distributes and transports natural gas for customers in portions of California. Additionally, through its subsidiaries, Southwest Gas operates two regulated interstate pipelines, including Great Basin, serving portions of Nevada and California. Southwest Gas makes investments in infrastructure to support customer demand associated with population growth and economic development activity and the safe and reliable operation of its system through adherence to integrity management programs.
As of December 31, 2025, Southwest Gas had approximately 2,281,000 residential, commercial, industrial, and other natural gas customers, of which 1,224,000 customers were located in Arizona, 849,000 in Nevada, and 208,000 in California. First-time meter sets were approximately 37,000 in 2025, of which 21,000 were located in Arizona, 15,000 in Nevada, and 1,000 in California; compared to 41,000 in 2024, of which 23,000 were located in Arizona, 17,000 in Nevada, and 1,000 in California. Residential and commercial customers represented over 99% of the total customer base. During 2025, 53% of operating margin (gas operating revenues less the net cost of gas sold) was earned in Arizona, 35% in Nevada, and 12% in California. During this same period, Southwest Gas earned 85% of its operating margin from residential and small commercial customers, 4% from other sales customers, and 11% from transportation customers. These general patterns are expected to remain materially consistent for the foreseeable future, subject to the ultimate outcome of the Great Basin Expansion Project. Refer to Potential 2028 Great Basin Expansion Projectdiscussion below.
Southwest Gas 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 Regulated operations revenues less the net cost of gas sold. However, operating margin is not specifically defined in U.S. GAAP. Thus, operating margin is considered a non-GAAP measure. Management uses this financial measure because Regulated operations revenues include the net cost of gas sold, which is a tracked cost that is passed through to customers without markup under PGA mechanisms. Fluctuations in the net cost of gas sold impact revenues on a dollar-for-dollar basis, but do 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 Gas' financial performance in a rate-regulated environment. The principal factors affecting changes in operating margin are generally the timing and amount of updated rates (to better align with Southwest Gas' cost of service and capital investments, including impacts of infrastructure trackers) and customer growth. Public utility commission decisions on the amount and timing of relief may impact our earnings. Refer to the Summary Operating Results table below for a reconciliation of utility gross margin to operating margin, and refer to Rates and Regulatory Proceedingsin this Management's Discussion and Analysis for details of various rate proceedings.
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 Gas' 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 Gas to pursue energy efficiency initiatives. Nearly all of our customers, and resulting revenue and margin, are included as part of mechanisms that reduce the impact of weather and volume variability on our earnings.
Our business may be impacted by economic conditions that impact businesses generally, such as inflationary impacts on goods and services consumed in the business, rising or sustained high interest rates, labor markets and other costs (including in regard to contracted or professional services), and the availability of those resources.
Executive Summary
The items discussed in this Executive Summary are intended to provide an overview of the results of the Company's and Southwest Gas' operations and are covered in greater detail in later sections of this Management's Discussion and Analysis.
Summary Operating Results
Year ended December 31,
(In thousands, except per share amounts) 2025 2024 2023
Contribution to net income (loss)
Natural gas distribution
$ 300,308 $ 261,176 $ 242,226
Pipeline and storage - - (16,288)
Corporate and administrative(1)
(65,472) (40,197) (85,944)
Income (loss) from continuing operations 234,836 220,979 139,994
Income (loss) from discontinued operations, net of taxes 204,990 (22,164) 10,895
Net income attributable to Southwest Gas Holdings, Inc.
$ 439,826 $ 198,815 $ 150,889
Weighted average common shares - basic
72,162 71,841 70,787
Basic earnings (loss) per share
Continuing operations $ 3.25 $ 3.08 $ 1.98
Discontinued operations 2.84 (0.31) 0.15
Net earnings (loss) per share - basic $ 6.09 $ 2.77 $ 2.13
Natural Gas Distribution Segment
Reconciliation of Utility Gross Margin to Operating Margin (Non-GAAP measure)
Utility Gross Margin $ 785,619 $ 696,964 $ 640,955
Plus:
Operations and maintenance (excluding Admin. & General) expense 328,501 325,152 316,246
Depreciation and amortization expense 330,724 303,095 295,462
Operating margin $ 1,444,844 $ 1,325,211 $ 1,252,663
Southwest Gas Corporation(2)
Reconciliation of Utility Gross Margin to Operating Margin (Non-GAAP measure)
Utility Gross Margin $ 785,619 $ 697,379 $ 632,404
Plus:
Operations and maintenance (excluding Admin. & General) expense 328,501 325,152 314,987
Depreciation and amortization expense 330,724 303,095 295,462
Operating margin $ 1,444,844 $ 1,325,626 $ 1,242,853
(1) In connection with the deconsolidation of Centuri, certain amounts in Corporate and administrative that relate to the Centuri separation have been reclassified to discontinued operations for all periods presented, as applicable.
(2)Historically, Southwest Gas Corporation's operating results have corresponded to the operating results of the Natural Gas Distribution Segment. The amounts reported in the table above differ from Natural Gas Distribution Segment due to the revision described in Note 3 - Revision of Previously Issued Financial Statements.
Overview
Southwest Gas Holdings, Inc.:
•Completed sale of entirety of remaining Centuri common stock through secondary public offerings and private placements resulting in net proceeds of approximately $1.3 billion during the year; collective net proceeds used to repay $709.0 million of outstanding indebtedness, which includes the full payment of the $550.0 million term loan and $159.0 million paydown of the credit facility, and to pay quarterly dividends to stockholders, with expectation to use the remainder for general corporate purposes, including support for the potential 2028 Great Basin expansion.
•Finished the year with approximately $576.6 million of cash on a consolidated basis; the Company did not issue equity in 2025.
•Full year utility gross margin of $785.6 million and operating margin of $1.4 billion for the Natural Gas Distribution segment.
Southwest Gas Corporation:
•Full year utility gross margin of $785.6 million and operating margin of $1.4 billion.
•37,000 first-time meters sets (1.6% growth rate) added over the past 12 months.
•$840.2 million capital investment in 2025.
•Executed binding precedent agreements in support of the 2028 Great Basin Expansion Project.
•Completion of Arizona General Rate Case.
Results of Operations
Southwest Gas' revenues and cost of gas sold can change depending on natural gas cost included in customer rates but these changes do not directly affect the company's profits. Regulatory commissions have set up mechanisms that allow Southwest Gas to adjust customer rates to reflect fluctuations in natural gas cost.
If the actual cost of gas differs from what is recovered through customer rates, the difference is recorded as a deferred amount.
•If Southwest Gas has under-recovered costs, it records a regulatory asset on the consolidated balance sheets as deferred purchase gas costs and interest income on the consolidated statements of income within the Other income (deductions) line item.
•If Southwest Gas has over-recovered costs, it records a regulatory liability on the balance sheet as deferred purchased gas costs and interest expense on the consolidated statements of income within the Net interest deductions line item.
These deferred amounts are either refunded to or recovered from customers during periods approved by the regulatory commissions. The rates are designed to be refunded or collected over a 12-month period.
Historically, the Natural Gas Distribution segment operating results have corresponded to the operating results of Southwest Gas Corporation. The amounts reported in the table above differ from Southwest Gas Corporation due to the revision described in Note 3 - Revision of Previously Issued Financial Statements.
Results of Natural Gas Distribution Segment
Year Ended December 31,
(Thousands of dollars) 2025 2024 2023
Regulated operations revenues $ 1,942,480 $ 2,475,216 $ 2,499,564
Net cost of gas sold 497,636 1,150,005 1,246,901
Operating margin 1,444,844 1,325,211 1,252,663
Operations and maintenance expense 537,644 520,820 511,646
Depreciation and amortization 330,724 303,095 295,462
Taxes other than income taxes 94,070 88,965 87,261
Operating income 482,406 412,331 358,294
Other income (deductions) 52,402 54,276 70,661
Net interest deductions 181,677 162,257 149,830
Income before income taxes 353,131 304,350 279,125
Income tax expense 52,823 43,174 36,899
Contribution to consolidated results $ 300,308 $ 261,176 $ 242,226
2025 vs. 2024
Contribution to consolidated net income from natural gas distribution operations increased $39.1 millionbetween 2025 and 2024 primarily due to:
•$119.6 million higher Operating margin primarily driven by updated rates in Arizona and all other territories that better align with Southwest Gas' cost of service and capital investments adding approximately $95.2 million of incremental margin and $11.5 million attributable to customer growth. Customer growth is reflective of approximately 37,000first-time meter sets added in 2025. Contributing to the increase is also $8.0 million related to the combined impacts of increases in recovery/return, offset by a comparable increase in depreciation and amortization expense in regulatory account balances noted below, and $5.9 million attributable to the variable interest expense adjustment mechanism in Nevada, offset by a comparable increase in amortization that is recognized in interest expense.
Partially offset by:
•$27.6 million, or 9%, higher Depreciation and amortization expense reflecting a $672.1 million, or 6%, increase in gas plant in service in the current year, in addition to $8.0 million in higher amortization related to regulatory account balances noted above. The increase in plant was primarily attributable to scheduled pipe replacement activities, new infrastructure, pipeline capacity reinforcement work, and franchise requirements.
•$19.4 million higher Net interest deductions primarily due to amounts incurred on higher over-collected PGA balances for Arizona and Nevada when compared to 2024, as well as higher variable interest expense adjustment mechanism in Nevada of $5.9 million associated with Southwest Gas' industrial development revenue bonds noted above.
•$16.8 million higher Operations and maintenance expense primarily attributable to increases in incentive compensation costs of $5.8 million, higher outside services costs of $4.8 million, higher cloud-computing costs of $4.4 million, and higher employee-related labor costs of $4.3 million. These increases were partially offset by reductions in leak survey and line locating expenses.
•$9.6 million higher Income tax expense resulting from increases of approximately $26.0 million primarily due to higher pre-tax income and lower amortization of excess accumulated deferred income taxes, partially offset by a tax benefit of $16.4 million due to changes in estimated future state apportionment rates.
•$5.1 million higher Taxes other than income taxes due primarily to increases in property taxes across all of Southwest Gas' jurisdictions.
•$1.9 million lower Other income (which is net of other deductions) primarily driven by a $12.6 million decrease in interest income. This decrease was mainly driven by lower interest income earned on money market investments and interest income earned on Southwest Gas' regulatory asset balances. Additionally, Arizona and Nevada transitioned from net under-collected balances during the beginning of 2024 to over-collected balances at the end of 2024 and remained over-collected at the end of 2025. Offsetting the decrease in interest income was $6.9 million primarily related to timing differences in contributions to the Southwest Gas Foundation in 2025 compared to 2024, $1.9 million increase in values associated with COLI policies, and $1.6 million gain on the sale of certain miscellaneous assets in 2025.
2024 vs. 2023
Contribution to consolidated net income from natural gas distribution operations increased $19.0 millionbetween 2024 and 2023 primarily due to:
•$72.5 million higher Operating margin primarily driven by updated rates in Arizona and all other territories that better align with Southwest Gas' cost of service and capital investments, adding approximately $65.3 million of incremental margin and $11.7 million attributable to customer growth. Customer growth is reflective of approximately 41,000first-time meter sets added in 2024. Favorable impacts ($9.2 million, combined) were also realized in connection with certain rate components of infrastructure trackers and the Nevada variable interest rate expense mechanism. Furthermore, late fee assessments on customer account balances provided approximately $2.7 million in incremental margin. Offsetting these increases was a decrease in recoveries associated with regulatory programs, totaling $6.8 millionfor which an associated comparable decrease is also reflected in amortization expense (discussed below). In addition, certain immaterial out-of-period corrections occurred in both 2023 and 2024 resulting in an unfavorable variance between comparative periods, primarily driven by an $8.0 million favorable adjustment in 2023. Customary gas used in operations (the effects of which are offset in Operations and Maintenance expense) also reduced operating margin ($3.8 million).
Partially offset by:
•$16.4 million lower Other income (which is net of other deductions) primarily due to a decline of $17.2 million in interest income compared to the prior year, related to a reduction in carrying charges associated with regulatory account balances, notably PGA balances, which decreased from an asset balance of $465.3 million as of December 31, 2023 to a net liability balance of $241.6 million as of December 31, 2024. Interest income is earned when these balances are in asset positions and interest expense is incurred when balances are in liability positions.
•$12.4 million higher Net interest deductions primarily due to the impacts of surcharges/surcredits and deferral activity related to a regulatory mechanism associated with interest on Southwest Gas' industrial development revenue bonds. Interest also increased due to amounts incurred on the over-collected PGA balance. Additionally, contributing to the increase was a lower level of debt-related AFUDC, which had the impact of increasing interest expense on a relative basis in 2024.
•$9.2 million higher Operations and maintenance expense primarily driven by general cost increases in benefit, incentive, and pension related costs, and leak survey and line locating costs, partially offset by contractor and professional services costs (the majority of which related to utility optimization consulting fees in 2023). Both periods exclude costs attributable to construction that are part of Net regulated operations plant and costs that would otherwise be expensed but are instead permissible to be deferred into regulatory assets (e.g., incremental leak survey costs in Nevada).
•$7.6 million, or 2.6%, higher Depreciation and amortization expense primarily due to a $704.5 million, or 7%, increase in gas plant in service in the current year. The increase in gas plant was attributable to pipeline capacity reinforcement work, franchise requirements, scheduled pipe replacement activities, and new infrastructure. This increase was offset by a decrease in amortization of regulatory account balances of $6.8 million as noted above.
•$6.3 million higher Income tax expense primarily due to higher pre-tax income and lower amortization of excess accumulated deferred income taxes.
Corporate and Administrative
2025 vs. 2024
The increase in net loss of $25.3 million from 2025 compared to 2024 was primarily due to:
•$53.2 million higher Income tax expense primarily due to increases in estimated future state apportionment rates from Arizona and California of $45.3 million combined with lower pre-tax loss.
Partially offset by:
•$22.9 million lower Net interest deductions primarily driven by the repayment of the $550.0 million term loan in the Summer of 2025 as well as the decrease in the balance that was previously outstanding on the revolving credit facility.
•$7.8 million higher Other income (which is net of other deductions) driven by an increase in interest income earned on money market accounts.
2024 vs. 2023
The decrease in net loss of $45.7 million from 2024 compared to 2023 was primarily due to:
•$50.0 million Goodwill impairment and loss on sale from the sale of MountainWest in 2023 compared to none in 2024.
Partially offset by:
•$6.7 million lower Income tax benefit primarily due to lower pre-tax loss in 2024 compared to 2023.
Discontinued Operations
2025 vs. 2024
Net income from discontinued operations increased $227.2 million in 2025 compared to 2024 primarily due to:
•$343.1 million gain from Centuri deconsolidation inclusive of a $222.9 million remeasurement gain from adjusting the 30.9% retained interest to fair value as of August 11, 2025. This retained interest was later sold on September 5, 2025 as described in Note 13 - Dispositions.
•$3.7 million lower Centuri separation related costs.
Partially offset by:
•$100.4 million higher income tax expense primarily related to the sale of Centuri.
•$9.7 million loss from the sale of the Company's 30.9% retained interest on September 5, 2025.
•$9.6 million higher in Centuri's pre-tax operating loss attributable to the Company.
2024 vs. 2023
Net income from discontinued operations decreased $33.1 million in 2024 compared to 2023 primarily due to:
•$262.1 million, or 9%, lower utility infrastructure services revenue in 2024 driven primarily by decreased gas utility infrastructure services revenues of $133.8 million and decreased electric utility infrastructure services revenues of $128.3 million. The decrease in gas utility infrastructure services revenues was primarily due to a reduction in net volumes under existing customer MSAs stemming primarily from delayed or unfavorable regulatory decisions faced by key customers and timing of bid projects, and the prior year benefited from the commencement of a large project that was substantially complete in 2023.
Partially offset by:
•$202.3 million, or 8%, lower utility infrastructure services expenses in 2024 due primarily to lower volume of infrastructure services provided. Subcontractor costs decreased during 2024 compared to the prior year primarily due to decreased work under offshore wind projects and changes in mix of work. Project margin in 2024 decreased primarily due to lower margins on bid work (the prior year benefited from a highly profitable bid that did not recur in the current year);
•$11.0 million lower Income tax expense primarily due to a decrease in pre-tax income in 2024.
•$10.1 million lower Depreciation and amortization expense primarily due to a number of small tools within electric utility infrastructure services operations becoming fully depreciated in 2023 and not requiring replacement based on project needs.
•$7.0 million lower Net interest deductions were primarily due to activity with regard to Centuri's debt balance.
Results of Southwest Gas Corporation
Year Ended December 31,
(Thousands of dollars) 2025 2024 2023
As Adjusted
As Adjusted
Regulated operations revenues $ 1,942,480 $ 2,482,990 $ 2,494,220
Net cost of gas sold 497,636 1,157,364 1,251,367
Operating margin 1,444,844 1,325,626 1,242,853
Operations and maintenance expense 537,644 520,820 510,387
Depreciation and amortization 330,724 303,095 295,462
Taxes other than income taxes 94,070 88,965 87,261
Operating income 482,406 412,746 349,743
Other income (deductions) 52,402 54,276 70,661
Net interest deductions 181,677 162,257 149,830
Income before income taxes 353,131 304,765 270,574
Income tax expense 52,823 42,669 42,162
Net income
$ 300,308 $ 262,096 $ 228,412
2025 vs. 2024
Contribution to consolidated net income from natural gas distribution operations increased $38.2 millionbetween 2025 and 2024 consistent with the Natural Gas Distribution segment except for:
•$10.2 million higher Income tax expense consistent with the Natural Gas Distribution segment explanation combined with an increase in income taxes related to the prior year adjustments as described in Note 3 - Revision of Previously Issued Financial Statements.
2024 vs. 2023
Contribution to consolidated net income from natural gas distribution operations increased $33.7 millionbetween 2024 and 2023 consistent with the Natural Gas Distribution segment except for:
•$82.8 million higher Operating margin consistent with the Natural Gas Distribution segment explanation combined with an increase in operating margin of $10.3 million due to revisions. See Note 3 - Revision of Previously Issued Financial Statements for additional information.
Partially offset by:
•$10.4 million higher Operations and maintenance expense consistent with the Natural Gas Distribution segment explanation combined with an increase in Operations and maintenance expense related to the prior year adjustments as described in Note 3 - Revision of Previously Issued Financial Statements for additional information.
•$0.5 million higher Income tax expense consistent with the Natural Gas Distribution segment explanation offset by a decrease in income taxes of $5.8 million related to the prior year adjustments as described in Note 3 - Revision of Previously Issued Financial Statements for additional information.
Rates and Regulatory Proceedings
With respect to rates and regulatory proceedings, Southwest Gas is subject to the regulation of the ACC, the PUCN, the CPUC, and two of Southwest Gas' subsidiaries are subject to regulation by the FERC.
General Rate Relief and Rate Design
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 Gas' service territories. Southwest Gas makes periodic filings for rate adjustments as the cost of providing service changes, including the cost of natural gas purchased, 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 along with a reasonable return on investment. On their own, the mix of fixed and variable components in rates assigned to various customer classes can significantly impact the operating margin actually realized by Southwest Gas. Management has worked with its regulatory commissions in designing rate structures that support the timely recovery of our costs, including returns to investors, in providing safe, affordable, and reliable service to its customers while mitigating volatility in prices to customers and providing stable returns to investors. Such rate structures were in place in each of Southwest Gas' operating areas during all periods for which results of natural gas distribution operations are disclosed above.
Arizona Jurisdiction
Arizona General Rate Case.Southwest Gas filed its 2024 Arizona rate case application in February 2024, proposing an increase in revenue of approximately $125.6 million and a return on common equity of 10.15%, relative to a 50% target equity ratio, and a proposed twelve-month post-test year adjustment for non-revenue producing plant to reflect the continued significant capital investments in the state and to update rates to more closely align with Southwest Gas' current level of operations and maintenance expense. The ACC's final decision in March 2025 authorized an overall annual rate increase of approximately $80.2 million and a return on common equity of 9.84% relative to a 48.5% equity ratio. Southwest Gas' proposals for the continuation of full revenue decoupling under the DCA mechanism and a property tax tracking mechanism were approved, but the proposed Unrecovered Gas Cost Expense mechanism, which was intended to address timelier recovery of the purchased gas cost portion of uncollectible customer accounts following write-off, was ultimately withdrawn in favor of the historical regulatory treatment for uncollectible accounts and related expense. The legacy COYL program was discontinued; however, an application was filed in June 2025 requesting recovery of the associated outstanding revenue requirement of approximately $5.2 million for work completed through March 2025. Recovery of the outstanding COYL revenue requirement over three years, as requested, was approved by the ACC in September 2025. Rates associated with the ACC's decision in the general rate case became effective in March 2025. In January 2026, Southwest Gas filed with the ACC its notice of intent to file its next general rate case in February 2026, including a proposal for an annual rate adjustment to promote customer rate gradualism and mitigate regulatory lag by adjusting rates annually to provide recovery of the Company's cost of service.
Initially included as part of the rate case application, Southwest Gas proposed the establishment of the SIM, a capital tracker designed to support non-revenue producing code and regulatory-related infrastructure replacements in Arizona, which was subsequently bifurcated from the rate case hearing. In April 2025, a settlement agreement supporting implementation of the SIM was reached with the majority of the parties, including a SIM surcharge effective April 1 each year subject to refund, to recover the revenue requirement associated with eligible plant placed in service by December 31 of the prior calendar year. The settlement considered by the ACC included a surcharge cap of $0.02 per therm, which represented approximately $150.0 million of annual SIM-related investment. In July 2025, the ACC modified the settlement to limit SIM-related
investments to $50.0 million annually. Other key provisions of the settlement remain unchanged. The first SIM surcharge application is expected to be filed with the ACC in March 2026.
Delivery Charge Adjustment. The DCA, or the Arizona decoupling mechanism, includes a filing each April, which along with other reporting requirements, contemplates a rate to return/recover the over- or under-collected margin tracker balance. The most recent filing was made in April 2025 to request a rate adjustment to address the under-collected balance of $40.7 million existing as of March 31, 2025. In August 2025, the ACC approved the application, as filed, to recover the under-collected balance of approximately $40.7 million, which is expected to be recovered over 12 months from the time of the approved application.
Tax Reform. A TEAM was approved in Southwest Gas' 2019 general rate case to timely recognize effective income tax rate changes resulting from federal or state tax legislation and returns/recovers the revenue requirement impact of changes in amortization of EADIT, including that which resulted from the 2017 Tax Cuts and Jobs Act, compared to the amount authorized in the most recently concluded general rate case. Following the inaugural surcredit rate establishment under the TEAM mechanism in December 2022, Southwest Gas has filed subsequent TEAM rate applications. The current surcharge rate designed to recover approximately $5.2 million resulting from changes related to the amortization of EADIT was approved and became effective June 1, 2025.
In December 2025, Southwest Gas filed its most recent TEAM rate application seeking authority to recover $0.7 million, which includes the current-year TEAM adjustment of approximately $7.9 million, primarily offset by the impact of Southwest Gas' election of the natural gas safe harbor tax method of accounting for determining whether certain natural gas repair and maintenance expenditures are capitalized or expensed for income tax purposes. As a result of this accounting method change, approximately $27.1 million of EADIT associated with historic tax repairs shifts from protected treatment amortized under the Average Rate Assumption Method to unprotected treatment. Southwest Gas proposed the amortization of the $27.1 million in unprotected EADIT over a five-year period, consistent with the approximate remaining amortization period of the unprotected EADIT established in Southwest Gas' 2019 general rate case. The application was approved in February 2026, as filed, with a rate effective date of June 1, 2026.
PGA Modification. On January 27, 2025, Southwest Gas filed a request to increase the GCBA adjustment to allow for a greater credit rate to be implemented more quickly in order to facilitate the return of the existing over-collected balance. Typical adjustments authorized by previous decisions limit the increase in the GCBA rate to $0.01 per month. The ACC approved Southwest Gas' request to implement a credit rate of $0.08138 per therm effective the first quarter 2025, and is expected to be in place for approximately one year and terminates when the GCBA balance is reduced to less than $10.0 million.
Nevada Jurisdiction
Nevada General Rate Case.Southwest Gas filed its most recent general rate case in September 2023, updated with a certification filing primarily for plant placed in service, and incremental annual leak survey costs, through November 2023. Those updates resulted in an updated overall request of approximately $74.0 million. The PUCN issued a decision approving an annual increase in revenues of $59.1 million, approving the earlier proposed settlement, and authorizing a return on common equity of 9.5%, including the use of a hypothetical capital structure of 50% debt and 50% equity. Included in the settled items were: a continuation of full revenue decoupling; authority to continue tracking incremental annual leak survey costs in a regulatory asset; and refreshed depreciation rates somewhat lower than those proposed. New rates became effective in April 2024. In January 2026, Southwest Gas filed with the PUCN its notice of intent to file a general rate case in March 2026, with new rates expected to be effective October 2026.
General Revenues Adjustment. The GRA, or Nevada decoupling mechanism, was affirmed as part of Southwest Gas' most recently concluded general rate case and adjustments are included in the ARA filings intended to update rates to recover/return amounts associated with various regulatory mechanisms, including the GRA. Recovery of rates and adjustments thereto as part of the ARA primarily impact cash flows, but not net income overall. Rates for the GRA and other regulatory mechanisms relating to the November 2024 ARA filing, associated with balances as of September 30, 2024, became effective July 1, 2025. Southwest Gas filed its 2025 ARA filing in November 2025 requesting to adjust the GRA rates to recover the approximate $28.2 million balance as of September 30, 2025, effective July 1, 2026.
Line Locate Activity Expenses Application. Southwest Gas filed an application with the PUCN for authority to establish regulatory accounting treatment for line locate activity expenses, allowing Southwest Gas to track the actual level of line locate costs in operation and maintenance expense and to record, in a regulatory asset or liability account, the difference between amounts incurred and the level established in the most recent general rate case. In July 2025, the PUCN approved regulatory accounting treatment of the line locate activity expenses, effective January 1, 2025. The proposal did not include carrying charges on the regulatory account balance in order to focus solely on stemming the financial attrition experienced in between rate cases related to this work. Amounts deferred in the regulatory asset are expected to be considered in the next general rate case, where authority to continue regulatory accounting treatment must be requested.
DEAA Modification. Southwest Gas filed an application with the PUCN for approval to adjust the DEAA rates in excess of the maximum allowable adjustment of 2.5 cents per therm contemplated by the Nevada Revised Statutes given the significant over-collected balances of the PGA in both southern and northern Nevada. A stipulation was reached with the parties and approved by the PUCN providing for the implementation of a DEAA credit of $0.20000 per therm applicable to southern Nevada customers and a credit of $0.25000 per therm applicable to northern Nevada customers effective July 1, 2025. The October 1, 2025 quarterly adjustment was calculated consistent with the statutory cap range resulting in an increased credit rate of $0.22500 in southern Nevada and $0.27500 in northern Nevada. The PGA balance at December 31, 2025 was over-collected by approximately $203.2 million for southern Nevada and by approximately $38.5 million for northern Nevada. These amounts represent reductions from the September 30, 2025 over-collected balances of $234.5 million and $48.2 million for southern and northern Nevada, respectively. This modification is expected to impact near-term liquidity at Southwest Gas when compared to earlier projections over 2025-2026 while modestly reducing interest expense on a net basis.
Resource Plan. In September 2025, Southwest Gas filed an application seeking approval of its first triennial resource plan, required by October 1, 2025, pursuant to SB 281 (2023). The application seeks approval of certain significant operational or capital requirements, as defined by SB 281, during the three-year action plan period, including two single extension facilities projects in southern Nevada designed to serve more than 2,000 customers, safety-related and system integrity management investments in southern and northern Nevada, and a proposal to commence a vintage 1984/1985 pipe replacement program in southern Nevada. The estimated capital investment associated with these programs is approximately $208.2 million over the three-year action plan period. The application also seeks approval of an approximate $4.8 million investment over the action plan period in two new safety-related programs (the natural gas alarm pilot program and the meter protection program), and includes a request to establish regulatory accounting treatment for each program. The natural gas alarm pilot program proposes the purchase and installation of approximately 10,000 natural gas alarms in high occupancy facilities across Southwest Gas' southern and northern Nevada service territories. The meter protection program proposes the purchase and installation of meter snow shelters to enhance the protection of existing meters in heavy snow load areas in Southwest Gas' northern Nevada service territory around Lake Tahoe. Southwest Gas is seeking approval to extend the currently authorized COYL replacement program, including the annual statewide capital investment amount of $5.0 million, and associated regulatory accounting treatment beyond the current program sunset date of July 30, 2027, through the end of 2028. Also included in the application is a request for approval of Southwest Gas' customer demand forecasting methodology for the applicable three-year action plan period. With respect to gas resources, Southwest Gas requested modification of its currently authorized price cap of
$14/dekatherm to $25/dekatherm for RNG purchases to better align with evolving RNG market conditions and to extend its current contract term length and purchasing authority for RNG beyond the currently approved date of December 31, 2029.
The application also requests authority to purchase responsibly sourced gas, in the form of carbon capture and storage-enabled natural gas, for incorporation into Southwest Gas' gas supply portfolio to meet up to 5% of its normal weather demand in northern and southern Nevada. Southwest Gas is also seeking approval of a demand-side management plan and proposed activities and programs, with a total statewide budget of $9.8 million over the three-year action plan period, to promote energy efficiency and conservation. Southwest Gas expects a decision on its triennial resource plan in April 2026.
California Jurisdiction
California General Rate Case.Southwest Gas filed its most recent general rate case in September 2024 related to a future test year (2026), originally proposing a statewide revenue increase of approximately $48.8 million. Southwest Gas later updated its request to $43.7 million through supplemental testimony, requesting a revised revenue increase of $36.6 million for the southern California rate jurisdiction, a decrease of $2.8 million for the northern California rate jurisdiction, and an increase of $9.8 million for the South Lake Tahoe rate jurisdiction. The request is based on a capital structure consisting of 50% long-term debt and 50% common equity with a requested return on common equity of 11.35%, a modest increase compared to the 11.16% currently authorized. A continuation of Southwest Gas' 2.75% PTY margin attrition adjustment for attrition years 2027 - 2030 is included, as well as continued use of the automatic trigger mechanism in lieu of annual cost of capital filings. Southwest Gas' filing also includes a risk-based decision-making framework, proposing the continuation of the targeted pipe replacement program, the meter protection program, and COYL Program, along with the addition of a new annual leak survey program, collectively under the IRRAM umbrella. Authority to establish a damage prevention cost balancing account to record and recover (or return) certain costs associated with damage prevention expenses, specifically those related to line locating activities, was also requested. Consolidation of Southwest Gas' northern California and South Lake Tahoe rate jurisdictions into a single rate-making jurisdiction was also proposed. The Cal Advocates filed direct testimony April 4, 2025, recommending a statewide revenue increase of approximately $26.1 million based on a capital structure consisting of 48% common equity and 52% long-term debt, as well as support for the continuation of the 2.75% PTY margin attrition adjustment and the automatic trigger mechanism. Cal Advocates also supported Southwest Gas' proposed infrastructure investments under the IRRAM, though the level of overall investment was slightly lower than the amount proposed by Southwest Gas. As a result of constructive settlement discussions, Southwest Gas and Cal Advocates successfully reached a partial settlement and agreed to litigate the outstanding issues, limited to capital structure, return on equity and the resultant overall rate of return. The limited-
issue hearing was held on July 29, 2025. The all-party partial settlement filed in September 2025 included an agreed-to revenue increase of $39.5 million before consideration of the litigated capital structure and cost of capital issues. Southwest Gas anticipates a final decision in the first quarter of 2026, and new rates are expected to be effective by April 2026, subject to the timing of the issuance of the final decision. The CPUC granted Southwest Gas' motion seeking authority to establish a general rate case memorandum account effective January 1, 2026, through the effective date of the CPUC's final decision allowing Southwest Gas to track changes in the revenue requirement beginning January 1, 2026.
Attrition Filing. Following the 2021 implementation of rates approved as part of the previous general rate case, the continuation of annual PTY margin attrition increases of 2.75% began in January 2022. The most recent annual margin attrition increase was also inclusive of adjustments related to the amortization of EADIT. The cumulative impact resulted in an annual increase of $7.3 million effective January 2025 for Southwest Gas' combined southern California, northern California, and South Lake Tahoe rate jurisdictions. The PTY increase of $3.6 million associated with the North Lake Tahoe Lateral revenue requirement became effective February 1, 2025.
FERC Jurisdiction
General Rate Case.Great Basin, a wholly owned subsidiary of Southwest Gas, filed a notice of a change in rates (pursuant to applicable regulations) on March 6, 2024 requesting that rates for natural gas service subject to the filing be made effective April 6, 2024. The FERC, however, suspended the case for a five-month period, which allowed rates to go into effect, subject to refund, on September 6, 2024. The filing included a request to continue a term-differentiated rate structure, which was adopted as part of Great Basin's previous general rate case, to provide an overall annual revenue increase of approximately $13.4 million, a return on equity of 11.95%, and a capital structure of 50% long-term debt and 50% common equity. A primary driver of the increase was approximately $99.0 million of capital investments, much of which was placed in service by the end of the August 2024 test year. An all-party settlement was reached recommending approval of a $9.6 million revenue increase based on a 9.76% pre-tax rate of return. Rate base increased to approximately $191.0 million; a 41.0% increase over the previously authorized $135.5 million. The settlement was filed with the FERC for final consideration in December 2024 and a Letter Order approving the uncontested settlement was issued in March 2025. Since no party requested reconsideration, the Letter Order became effective April 2, 2025, and refund amounts in excess of the base tariff rates established in the settlement were issued timely.
Potential 2028 Great Basin Expansion Project. In response to inquiries related to available capacity and changing market needs, Great Basin posted notice of a Binding Open Season for a 2028 system expansion. The Binding Open Season, initially scheduled from January 28, 2025, through April 30, 2025, to determine the level of interest of existing and potential shippers for new or additional firm transportation service, was extended through June 2025 to allow for consideration of alternative in-service date requests as part of the bids and resulted in a potential incremental capacity of up to ~1.76 billion cubic feet of demand per day. To accommodate continued interest following the Open Seasons held earlier in 2025, a second supplemental open season launched on November 11, 2025, to provide potential shippers additional opportunity to submit binding requests, refine capacity needs, consider alternative in-service dates, and evaluate the final scope of the expansion project to support energy demand growth across northern Nevada. In December 2025, precedent agreements were executed with shippers to accommodate capacity requests totaling approximately 800 million cubic feet per day. Subject to approval from FERC to construct and operate the system expansion, Great Basin estimates a potential capital investment of approximately $1.7 billion in the next three years with an expected in-service date of late 2028.
PGA Filings
The rate schedules in all of Southwest Gas' 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 Gas result in over- or under-collections. Balances are recovered from, or refunded to, customers on an ongoing basis with interest. As of December 31, 2025, over-collections in both the Arizona and Nevada service territories resulted in a liability of approximately $310.1 million and under-collections in California resulted in an asset of approximately $5.2 million on the Company's and Southwest Gas' Consolidated Balance Sheets. The over-collected balances in the table below reflect the impacts related to specific recovery rates under existing mechanisms, which have exceeded the cost of recent gas supply purchases by Southwest Gas.
Filings to change rates in accordance with PGA clauses are subject to audit by the staff of state regulatory commissions. The operation of the mechanism in California is typically the most responsive to changes in gas supply costs and maximum rate adjustments for the earlier build-up (positive or negative) apply to Nevada and Arizona; however, refer to the PGA Modificationdiscussion above related to Arizona and the DEAA Modificationin Nevada. PGA changes impact cash flows but have no direct impact on operating margin. However, gas cost deferrals and recoveries can impact comparisons between periods of individual consolidated income statement components. These include Regulated operations revenues, Net cost of gas sold, Net interest deductions, and Other income (deductions).
The following table presents Southwest Gas' outstanding PGA, including accrued purchased gas costs, balances receivable/(payable) at the end of its two most recent fiscal years:
December 31,
(Thousands of dollars) 2025 2024
Arizona $ (68,423) $ (47,700)
Nevada (241,662) (207,698)
California 5,214 13,807
$ (304,871) $ (241,591)
Arizona PGA Filings. In Arizona Southwest Gas 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. In early 2025, the ACC approved an elevated GCBA credit rate authorizing the elevated credit rate to remain in effect until the GCBA balance is reduced to less than $10.0 million. The rates are designed to recover/refund the balances over a twelve-month period subject to fluctuations in natural gas prices and actual customer usage.
California Gas Cost Filings. In California a monthly gas cost adjustment based on forecasted monthly prices is utilized. Monthly adjustments modeled in this fashion provide the timeliest recovery of gas costs in any Southwest Gas jurisdiction.
Nevada Gas Cost Filings. In November 2025, Southwest Gas filed its quarterly adjustments to its gas cost rates, which consist of the Base Tariff Energy Rate and the DEAA rate, to be effective January 1, 2026. The quarterly adjustment was calculated consistent with the statutory cap range of $0.025 for the DEAA component resulting in credit rates of $0.25 and $0.30 in southern and northern Nevada, respectively. Gas cost rates otherwise are updated on an ongoing basis quarterly, with changes effective each January, April, July, and October. The rates are designed to recover/refund the balances over a twelve-month period, subject to fluctuations in natural gas prices and actual customer usage.
Gas Price Volatility and Mitigation
To mitigate price volatility to its customers, Southwest Gas periodically enters into fixed-price term contracts under its volatility mitigation programs for up to 25% of the California jurisdictions' annual normal weather supply needs and, to a limited extent, in the Arizona jurisdiction. For the 2025/2026 heating season, contracts contained in the fixed-price portion of the supply portfolio ranged from approximately $4.02 to approximately $5.37per dekatherm. In consultation with its regulators, Southwest Gas does not currently plan to make any fixed-price term purchasesother than in California nor to enter into financial swap agreements. Southwest Gas' natural gas purchases not covered by fixed-price contracts are under variable-price contracts with firm quantities or on the spot market. The contract price for these contracts is either determined at the beginning of each month, to reflect the published first-of-month index price, or at market prices based on a published daily price index. In each case, the index price is not published or known until the purchase period begins. Plans with regard to fixed-price portfolios or other hedging programs could change as Southwest Gas monitors conditions and collaborates with regulatory commissions over time.
Pipeline Safety Regulations
PHMSA issues direct final rules and periodic standard updates that incorporate newer editions of industry consensus standards. This brings federal pipeline safety regulations into alignment with the latest industry standards and helps maintain or improve safety while reducing regulatory ambiguity. In 2025, fourteen direct final rules were approved with an effective date of January 1, 2026, and twenty periodic standards were approved with an effective date of January 10, 2026. Southwest Gas has integrated these new standards into its operating procedures.
Notices of Proposed Rulemaking. PHMSA published the following two significant NPRMs in 2023:
1.The first is the Pipeline Leak Detection and Repair NPRM, which aims to mandate methane emissions reductions through the revision of operations and maintenance procedures for natural gas operators, the promulgation of advanced leak detection equipment, and accelerated leak repair criteria. The final rule was expected to be published in mid-2024; however, it was not sent to OFR until January 17, 2025. Shortly thereafter, on January 20, 2025, a "Regulatory Freeze Pending Review" directive was issued by the White House requiring all agencies to withdraw any rules that had been sent to the OFR for publication in the Federal Register that was not yet published. Subsequently, PHMSA withdrew the final rule on January 22, 2025. The future of this rulemaking under the current administration is uncertain; however, Southwest Gas continues to evaluate potential impacts from this NPRM and monitor progress.
2.The second item, the Safety of Gas Distribution NPRM, resulted from congressional mandates and National Transportation Safety Board recommendations stemming from a 2018 incident in the Merrimack Valley, in Massachusetts. This NPRM was expected to be finalized in late 2024; however, a final rule has not been finalized as of the date of this Annual Report and it is uncertain as to when a final rule will be published. The final rule is expected to include provisions that are primarily aimed at mitigating over pressurization incidents, particularly on utilization pressure systems. Southwest Gas does not own or operate any utilization pressure systems but is monitoring the progress and potential impacts, if any, of this NPRM.
PHMSA published the following four NPRMs on July 1, 2025:
1.Atmospheric Corrosion Reassessment for Pipeline Replacements: This NPRM proposes to exempt replaced service lines from the three-year reinspection requirement. This change will allow replaced service lines to default to the standard five-year atmospheric corrosion inspection interval. Southwest Gas continues to evaluate potential impacts from this NPRM and monitor progress.
2.Eliminating Burdensome and Duplicative Deadlines for Gas Pipeline Coating Damage Assessments and Remedial Actions: Under current regulatory requirements operators must assess coating damage "promptly" after backfilling and no later than 6 months after the pipeline is placed in service (for projects that involve 1,000 ft or more of continuous backfill length along the pipeline). This NPRM would eliminate the vague timing language of "promptly after backfill" as a compliance milestone and set assessments to occur within 6-months of placing the pipeline back in service. Southwest Gas continues to evaluate potential impacts from this NPRM and monitor progress.
3.Exemption for In-Plant Piping Systems: Currently no explicit exemption exists in Part 192 for in-plant piping systems. This NPRM would add a new definition for in-plant piping systems clarifying the point of demarcation and explicitly exclude any "in-plant system" from the scope of Part 192. Southwest Gas continues to evaluate potential impacts from this NPRM and monitor progress.
4.Harmonize Class Location Change Pressure Test Requirements with Subpart J Pressure Test Requirements: Current regulation excludes the use of a 4-hour pre-installation test when a pipeline segment undergoes a class location change. Operators must confirm or revise Maximum Allowable Operating Pressure using a pressure test conducted in place for at least 8-hours. This NPRM proposes to allow either the 8-hour test or the 4- hour pre-installation strength test, which better aligns with existing Subpart J pressure testing provisions. Southwest Gas continues to evaluate potential impacts from this NPRM and monitor progress.
Advance Notices of Proposed Rulemakings. On May 21, 2025, PHMSA published in the Federal Register an ANPRM for "Pipeline Safety: Repair Criteria for Hazardous Liquid and Gas Transmission Pipelines" asking stakeholders for feedback on potential opportunities to improve cost-effectiveness of its repair requirements for gas transmission pipelines. Southwest Gas met with other members of the AGA to prepare joint industry comments back to PHMSA on potential changes to the following regulations: Reporting safety-related conditions, verification of pipeline material properties & attributes for transmission pipelines, transmission assessments outside of high consequence areas, analysis of anomalies, reassessments, and schedules for evaluation and remediation.
On June 4, 2025, PHMSA published in the Federal Register an ANPRM for "Pipeline Safety: Mandatory Regulatory Reviews to Unleash American Energy and Improve Government Efficiency" asking stakeholders to comment on whether any existing Pipeline Safety Regulations (across 49 CFR Parts 190-199) should be repealed or amended to eliminate undue regulatory burdens on energy resources and improve government efficiency while still ensuring pipeline safety. Southwest Gas met with other members of the AGA to complete a retrospective review of the current regulations and provide joint industry comments and recommendations back to PHMSA regarding numerous Procedural and Pipeline Safety Regulations.
Southwest Gas continues to monitor changing pipeline safety legislation and participates, to the extent possible, in providing public comments and works with industry associations, such as the AGA, in shaping regulatory language associated with these new mandates and reporting requirements. Additionally, management works with state and federal commissions, to which Southwest Gas, including its subsidiaries, are subject, 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 for Southwest Gas.
Capital Resources and Liquidity
Historically, cash on hand and cash flows from operations have provided a substantial portion of cash used in investing activities (primarily construction expenditures and property additions). In recent years, Southwest Gas has undertaken substantial pipe replacement activities to fortify system integrity and reliability, including on an accelerated basis in association with certain gas infrastructure replacement programs. Southwest Gas Holdings and Southwest Gas' capitalization strategy is to maintain an appropriate balance of equity and debt to preserve investment-grade credit ratings, which helps minimize interest costs. Investment-grade credit ratings have been maintained by Southwest Gas Holdings and Southwest Gas.
Cash Flows
Southwest Gas Holdings, Inc.:
Operating Cash Flows. Cash flows provided by operating activities decreased $799.7 million between 2025 and 2024. The decrease was primarily from the decrease of continuing operations operating cash flow of $611.2 million driven by the substantial reduction of collection of previously deferred purchased gas costs for Southwest Gas. Recovery rates were in place to collect the earlier build-up of PGA balances, which are collectively now in a liability position. The remaining difference reflects the impacts of changes in other components of working capital overall. Discontinued operations operating cash flow also contributed to the decrease of $188.5 million. The decrease was mainly attributable to Centuri's change of working capital.
Investing Cash Flows. Cash flows used in investing activities decreased $896.8 million in 2025 as compared to 2024. The decrease in cash flow used in discontinued operations of $866.1 million was primarily due to the proceeds received from the sale of Centuri stock on August 11, 2025 and September 5, 2025 of $879.2 million. Cash flow used in continuing operations also contributed to the decrease of $30.7 million. The overall change was driven by reduced outflows for capital expenditures and property additions compared to 2024.
Financing Cash Flows. Cash flows used in financing activities increased $141.9 million in 2025 as compared to 2024. The increase was primarily from the increase of cash flow used in continuing operations of $722.9 million driven by the payment in full on Southwest Gas Holdings' term loan of $550.0 million and $130.0 million (net of borrowings) paydown on its revolving credit facility utilizing proceeds from the sale of Centuri stock. Offsetting this impact was a decrease in cash flow used in discontinued operations of $581.0 million which was primarily due to proceeds received from the sale of Centuri stock on May 22, 2025, June 18, 2025 and July 8, 2025 of 470.7 million.
Corporate and administrative expenses/outflows for Southwest Gas Holdings in 2025 overall primarily include interest paid on outstanding borrowings.
The capital requirements and resources of the Company generally are determined independently at the segment level. Our Natural Gas Distribution segment is generally responsible for securing its own debt financing sources. However, Southwest Gas Holdings may raise funds through equity issuances or other external financing sources in support of our Natural Gas Distribution segment.
Southwest Gas Corporation:
Operating Cash Flows. Cash flows provided by operating activities decreased $634.2 million between 2025 and 2024 primarily attributable to the substantial reduction in collection of deferred purchased gas costs (as discussed above), in addition to reflecting cash flows from other working capital changes overall.
Investing Cash Flows. Cash used in investing activities decreased $32.8 million in 2025 as compared to 2024. Outflows for capital expenditures decreased by $38.7 million in 2025 as well as reduced outflows related to customer advances for construction. Partially offsetting these impact was lower inflows from the sale of property in 2025 compared to 2024. See also 2025 Construction Expenditures below.
Financing Cash Flows. Net cash used in financing activities decreased $106.8 million in 2025 as compared to 2024. The decrease was primarily due to a decrease in dividends paid to Southwest Gas Holdings between periods.
2025 Construction Expenditures
During the five-year period ended December 31, 2025, total gas plant in service increased from $8.4 billion to $11.5 billion or at an average annual rate of 7%. Replacement, new business, and reinforcement work was a substantial portion of the plant increase during the five-year period. Customer growth also impacted expenditures as Southwest Gas set approximately 197,000 meters during this time, which is reflected in new business.
During 2025, construction expenditures (including accruals) for Southwest Gas were $840.2 million. The majority of these expenditures represented costs associated with replacement of existing transmission and distribution plant to fortify system integrity and reliability, as well as general plant additions. Cash flows from operating activities of Southwest Gas were $618.8 million; exceeding 2025 construction expenditures and dividend requirements of the natural gas operations segment.
2025 Financing Activity
As of December 31, 2025, the Company had up to $340.0 million of common stock available for sale under its ATM Program. No issuances have occurred under the ATM Program in 2025.
Net proceeds received under the Dividend Reinvestment and Stock Purchase Plan during 2025 were approximately $19.2 million from the issuance of approximately 256,000 shares of Company common stock.
Natural Gas Distribution Segment Construction Expenditures, Debt Maturities, and Financing
Management estimates natural gas distribution segment construction expenditures during the five-year period ending December 31, 2030 will be approximately $6.3 billion, including approximately $1.7 billion for the 2028 Great Basin Expansion Project.
(In billions)
2026 2027 2028 2029 2030
Total (1)
Capital Expenditures
$ 1.3 $ 1.3 $ 1.8 $ 0.9 $ 1.0 $ 6.3
(1)Includes approximately $190.0 million that would be recorded in Deferred charges and other assets.
Southwest Gas plans to continue to request regulatory support to undertake projects, or to accelerate projects as necessary, for the improvement of system flexibility and reliability or to expand, where relevant, to unserved or underserved areas. Southwest Gas may expand existing or initiate new programs. Significant replacement activities are expected to continue well beyond the next few years. During the five-year period ending December 31, 2030, cash flows from operating activities of Southwest Gas are expected to provide approximately 60% of the funding for total construction expenditures, and dividend requirements. From a debt maturity standpoint, Southwest Gas has a $75.0 million 8% senior unsecured debenture due in 2026. Any additional cash requirements, including construction-related, and any paydown or refinancing of debt are expected to be provided by credit facilities, equity contributions from the Company, and/or other external financing sources. During the five-year period, Southwest Gas will have $1.5 billion of long-term debt maturing. 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 and amounts of surcharge collections from or amounts returned to customers related to regulatory mechanisms, including the PGA, maturities of long-term debt instruments, as well as growth levels in Southwest Gas' service areas and earnings. External financings could include the issuance of debt securities, bank and other short-term borrowings, and other forms of financing.
The Great Basin Expansion Project is a planned investment by Great Basin Gas Transmission Company, a subsidiary of Southwest Gas, to expand firm transportation capacity on its Northern Nevada pipeline system. Subject to regulatory approvals and execution of long-term transportation agreements, the project is expected to add up to 800 Mcf/d of capacity with capital expenditures of approximately $1.7 billion through an anticipated late 2028 in-service date. The expansion is expected to support regional energy demand and contribute to the company's regulated earnings base.
Liquidity
Several 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 ratemaking policies of regulatory commissions, regulatory lag, customer growth in the natural gas distribution segment, the ability to access and obtain capital from external sources, the level of interest rates, changes in income tax laws, pension funding requirements, inflation, the availability and cost of contract labor, supply chain constraints within the compression and steel pipe markets, and the level of earnings. Natural gas prices and related gas cost recovery rates, as well as plant investment and ratemaking activities, have historically had the most significant impact on liquidity, aside from the Company's strategic undertakings, in the recent past, including acquisition and disposition activity.
On an interim basis, Southwest Gas defers over- or under-collections of gas costs to PGA balancing accounts. In addition, Southwest Gas 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. At December 31, 2025, the balance in the PGA accounts included an under-collection of approximately $5.2 million pertaining to the California jurisdiction and an over-collection of $310.1 million pertaining to Arizona and Nevada.
In April 2023, Southwest Gas Holdings entered into a $550.0 million Term Loan Credit Agreement that was set to mature in October 2024. The Company utilized a majority of the proceeds to make an equity contribution to Southwest Gas. In August 2024, Southwest Gas Holdings amended its Term Loan agreement; extending the maturity date to July 31, 2025, and changing the interest with reference to SOFR from an applicable margin of 1.300% to 1.125%, among other miscellaneous changes. In June 2025, Southwest Gas Holdings entered into a second amended and restated term loan credit agreement; extending the maturity date of this agreement to June 2026. Prior to the execution of the amendment, Southwest Holdings prepaid a portion of the indebtedness, decreasing the balance from $550.0 million to $225.0 million, utilizing proceeds received from the Centuri separation transactions. In August 2025, Southwest Gas Holdings paid the remaining balance of $225.0 million utilizing proceeds received from additional Centuri separation transactions. See Note 13 - Dispositions.
Southwest Gas Holdings has a credit facility with a borrowing capacity of $300.0 million that expires in August 2029. This facility is intended for short-term financing needs. At December 31, 2025, no borrowings were outstanding under this facility. The maximum amount outstanding during 2025 occurred during the second quarter and was $144.0 million.
Southwest Gas has a credit facility with a borrowing capacity of $400.0 million, which matures in August 2029. Southwest Gas designates $150.0 millionof the facility for long-term borrowing needs and the remaining $250.0 million for working capital purposes. There was no activity on either the long-term or short-term portions of the existing facility during 2025. As of December 31, 2025, no borrowings were outstanding on the long-term portion of the credit facility (including no borrowings outstanding under the commercial paper program) and no borrowings were outstanding on the short-term portion. The credit facility has been 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. The credit facility has generally been adequate for Southwest Gas' needs outside of funds raised through operations and other types of external financing.
Southwest Gas has a $50.0 million commercial paper program. 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 is designated as long-term debt. Interest rates for the commercial paper program are calculated at the then current commercial paper rate. At December 31, 2025, there were no borrowings outstanding under this program.
In April 2024, Centuri successfully completed the Centuri IPO. Since the Centuri IPO and through September 5, 2025, the Company sold portions of its interests in Centuri through secondary public offerings and private placements. On September 5, 2025, the Company completed its divestiture of its ownership in Centuri and no longer retains any governance or consent rights over the actions of Centuri under the Separation Agreement. The Company used a portion of the $1.3 billion in proceeds from the Centuri sale transactions in 2025 for the repayment of outstanding indebtedness, dividends to stockholders, and expects to use the remainder for general corporate purposes, including support for future capital investments at Southwest Gas, as well as the potential 2028 expansion of Great Basin, and future dividend payments to stockholders that would otherwise be funded by Southwest Gas.
Credit Ratings
Credit ratings apply to debt securities, which constitute a significant portion of total capitalization, 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, S&P, and Fitch) provide a method for determining the creditworthiness of an issuer. These credit ratings are a factor considered by lenders when determining the cost of current and future debt for each debt obligor (i.e., generally the better the rating, the lower the cost to borrow funds). The current unsecured long-term debt ratings of the Company and Southwest Gas are considered investment grade.
A credit rating, including the foregoing, 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. Numerous factors, including many that are not within management's control, are considered by the ratings agencies in connection with the assigning of credit ratings.
Moody's(1)
Standard & Poor's (2)
Fitch (3)
Southwest Gas Holdings, Inc.:
Issuer rating Baa2 BBB+ BBB
Outlook Stable Stable Stable
Last reaffirmed April 2025 September 2025 August 2025
Southwest Gas Corporation:
Senior unsecured long-term debt Baa1 BBB+ A-
Outlook Stable Stable Stable
Last reaffirmed April 2025 September 2025 August 2025
(1) Moody's debt ratings range from Aaa (highest rating possible) to C (lowest quality, usually in default). A numerical modifier of 1 (high end of the category) through 3 (low end of the category) is included with the rating to indicate the approximate rank of a company within the range.
(2) S&P debt ratings range from AAA (highest rating possible) to D (obligation is in default). The ratings from 'AA' to 'CCC' may be modified by the addition of a plus "+" or minus "-" sign to show relative standing within the major rating categories.
(3) Fitch debt ratings range from AAA (highest credit quality) to D (defaulted debt obligation). The modifiers "+" or "-" may be appended to a rating to denote relative status within major rating categories.
None of Southwest Gas' 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 Gas' bond ratings. Certain debt instruments are subject to a leverage ratio cap and the 6.1% Notes due 2041 are also subject to a minimum net worth requirement. At December 31, 2025, Southwest Gas was in compliance with all of its covenants. Under the most restrictive of the financial covenants, approximately $4.7 billion in additional debt could be issued and the leverage ratio requirement would still be met. At least $3.0 billion of cushion in equity relating to the minimum net worth requirement exists at December 31, 2025. No specific limitations as to dividends exist under the collective covenants. None of the debt instruments contain material adverse change clauses.
At December 31, 2025, Southwest Gas Holdings was also in compliance with all of the covenants of its credit facility. The credit facility is subject to a leverage ratio cap. Under the most restrictive of the financial covenants, approximately $5.7 billion in additional debt could be issued while still meeting the leverage ratio requirement. No specific limitations as to dividends exist under the collective covenants. The credit facility and term loan agreements do not contain material adverse change clauses.
Inflation
Inflation can impact results of operations for each of the Company's business segments and, while the level of increase has waned over the past year, the level of improvement is only in relation to the multi-decade high inflation in 2022. Labor, employee benefits, fuel, 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 directly impact earnings overall; indirect impacts primarily result from interest carrying charges on accumulated PGA balances, or through borrowing costs incurred to fund purchases or to repay overcollected PGA balances. Labor, employee benefits, and professional services are 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 or other procedural filings are made by our regulated operations, 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 negatively impact earnings. See Rates and Regulatory Proceedingsfor a discussion of recent rate case proceedings.
Contractual Obligations
Our largest contractual obligations as of December 31, 2025, consisted of:
•Debt-related obligations for scheduled principal payments, other borrowings, and interest payments over the life of the debt. Debt obligations are included in our consolidated balance sheets. See Note 9 - Debtfor additional information.
•Southwest Gas has gas purchase obligations that include fixed-price and variable-rate gas purchase contracts. Variable-rate contracts reflect minimum contractual obligations with estimation in pricing based on market information. Actual future variable-rate purchase commitments may vary depending on market prices at the time of delivery and values may change significantly from their estimated amounts. Certain other variable-rate contracts allow for variability in quantities for which associated demand charges are included in the gas purchase obligations based on the maximum daily quantities available under the contracts. As of December 31, 2025, gas purchase obligations of $175.1 millionare payable within the next 12 months.
•Southwest Gas has pipeline capacity and storage contracts for firm transportation service, both on a short- and long-term basis with several companies in all of its service territories, some with terms extending to 2050. Southwest Gas 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, similar to gas purchase/supply arrangements, are a component of the cost of gas sold and are recovered from customers primarily through the PGA mechanisms. As of December 31, 2025,pipeline capacity and storage obligations of $108.8 millionare payable within 12 months.
•Other commitments associated with noncancellable obligations consist primarily of software licensing, equipment, outsourced processing subscriptions, and operating and/or maintenance agreements, as applicable. These agreements generally range from one to five years. As of December 31, 2025, other commitment obligations totaled $39.8 million and $23.8 million are payable within 12 months.
•Estimated funding for pension and other postretirement benefits during calendar year 2026 is $23.5 million. Funding amounts for years beyond 2026 are not currently known.
Recently Issued Accounting Standards Updates
The FASB routinely issues ASUs. See Note 2 - Summary of Significant Accounting Policiesfor more information regarding these ASUs and their potential impact on the Company's and Southwest Gas' financial position, results of operations, and disclosures.
Application of Critical Accounting Policies and Estimates
A critical accounting policy is one that 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 notes to the consolidated financial statements.
Regulatory Accounting
Natural gas distribution operations are subject to the specific regulation of the ACC, PUCN, CPUC, or the FERC, as applicable. The accounting policies of the Company and Southwest Gas conform to U.S. GAAP applicable to rate-regulated entities and reflect the effects of the ratemaking process. As such, the Company and Southwest Gas are allowed to defer, as regulatory assets, costs that otherwise would be expensed, if it is probable that future recovery from customers (subject to our rate-regulated operations) will occur. Companies are also permitted to recognize as regulatory assets amounts associated with various revenue decoupling mechanisms as long as the conditions for recognition 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 refunded 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. Discontinuing the application of this method of accounting for regulatory assets and liabilities or changes in the accounting for our various regulatory mechanisms could significantly increase our operating expenses as fewer costs would likely be capitalized or deferred on the balance sheet, which could reduce our net income. Factors influencing application of this policy include decisions of regulatory authorities, implementation of new regulations or regulatory mechanisms, assessing the probability of the recoverability of deferred costs, and continuing to meet the criteria of a rate regulated entity for accounting purposes. Refer also to Note 5 - Regulatory Assets and Liabilities.
Accrued Utility Revenues
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. Additionally, all Southwest Gas rate jurisdictions have decoupled rate structures, limiting variability due to extreme weather conditions.
Accounting for Income Taxes
The Company is subject to income taxes in the U.S. Income tax calculations require estimates due to known future effective income tax rate changes, book to tax differences, and uncertainty with respect to regulatory treatment of certain property items. The asset and 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 income tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Management regularly assesses financial statement tax provisions to identify any change in the regulatory treatment or tax-related estimates, assumptions, or enacted income tax rates that could have a material impact on cash flows, financial position, and/or results of operations.
Accounting for Pensions and Other Postretirement Benefits
Southwest Gas has a noncontributory QRP with defined benefits covering substantially all employees hired on or before December 31, 2021. In addition, there is a separate unfunded supplemental retirement plan which is limited to officers hired on or before December 31, 2021. 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 $39.0 million and pension expense by $4.0 million. A change of 0.25% in the employee compensation assumption would change the pension obligation by approximately $8.0 million and pension expense by $2.0 million. A 0.25% change in the expected asset return assumption would change the pension expense by approximately $3.0 million (but would have no impact on the pension obligation). Beginning in 2024, a treasury futures overlay hedging strategy was implemented, intending to mitigate the impact of changes in the discount rate over time and thus reducing the pension plan's overall sensitivity to changes in interest rates as well as to lessen volatility in the plan's funded status. However, there is no guarantee that the mechanism implemented will achieve these results.
Given the recent interest rate environment applicable to long-term high-quality corporate bonds, which are utilized by Southwest Gas in selecting a discount rate based on relevant provisions in U.S. GAAP, the discount rate applicable to the pension plan remained the same at 5.75% as of December 31, 2025 and 2024, respectively. The methodology utilized to determine the discount rate was consistent with prior years. A decrease in the discount rate increases the pension obligation in the current year and expense in the year ahead; funding levels, among other items, are also impactful. Southwest Gas maintained the return on assets expected over the long term at 7.00%, which was supported by available data. The salary escalation assumption was left unchanged at 3.50% given recent and expected salary changes and market conditions over a longer-term horizon. Southwest Gas plans to slightly decrease its funding in 2026 compared to 2025, with the intention to provide a strong funded ratio overall for participants, while also striving to avoid a significantly overfunded position in the future. The pension is approximately 102% funded as of December 31, 2025, and due to the foregoing updated conditions, including amortization of actuarial gains/losses, pension expense is expected to be higher in 2026 by approximately $10.4 million. The funded status improved in 2025 compared to 2024, including impacts from the change in the discount rate, and is forecasted to improve further in the future using the current assumptions outlined above and management's funding expectations. However, the funded status and expense levels in the future will continue to be influenced by, as applicable, long-term discount rates, the treasury futures hedging overlay, asset returns, and plan funding by Southwest Gas.
Certifications
The SEC requires the filing of certifications of the CEO and 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, 2025, are included as exhibits to this Annual Report on Form 10-K filed with the SEC.
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