Note 6 - Revenue
Southwest Gas recognizes revenue when it satisfies its performance by transferring gas to the customer. Revenues also include the net impacts of margin tracker and 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 Gas 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 Regulated operations revenues. Management uses the net classification method to report taxes collected from customers to be remitted to governmental authorities.
Southwest Gas generally offers two types of services to its customers: tariff sales and transportation–only service. Tariff sales encompass sales to primarily residential and small commercial customers under various rate schedules, subject to cost-of-service ratemaking, which is based on the rate-regulation of the ACC, CPUC, PUCN, and FERC. Southwest Gas provides both the commodity and the related distribution service to nearly all of its approximate 2.3 million customers, and only several hundred customers subscribe to transportation-only service. 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 all performance obligations required for Southwest Gas to recognize revenue. The amount billable via regulated rates, billed via both volumetric and fixed monthly rates as part of rate design, corresponds to the value to the customer, and Southwest Gas believes that the amount billable is appropriate to utilize for purposes of recognizing revenue. Estimated amounts remaining unbilled since the last meter read date 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 are able to generally terminate service at will.
Transportation-only service is also governed by tariff rate provisions. Transportation-only service is generally only available to large customers under requirements of Southwest Gas’ various tariffs. With this service, customers secure their own gas supply and Southwest Gas provides transportation services to move the customer-supplied gas to the intended location. Southwest Gas recognizes transportation service revenue over time through a combination of volumetric charges and fixed charges through a variety of design mechanisms approved by regulators. 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.
Under its regulations, Southwest Gas enters into negotiated-rate contracts with customers located near competing pipelines that pose a risk of bypassing its distribution system. Southwest Gas may also enter into similar contracts for customers that are otherwise able to satisfy their energy needs through a fuel alternative 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 and 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 that do not have without negotiated rate components and the negotiated rates are within the parameters of the tariff guidelines. Furthermore, while some of these contracts may include multi-year contract periods because amounts billable under the contract are based on rates in effect for the customer for service provided to date, no significant financing component is believed to exist.
As indicated above, revenues also include the net impacts of margin tracker and decoupling accruals. All of Southwest Gas’ service territories have decoupled rate structures 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. These decoupled rate structures qualify as alternative revenue programs. The primary alternative revenue programs involve adjustments for differences between stated tariff benchmarks and amounts billed through revenue from contracts with customers via existing rates. Such adjustments are recognized monthly in revenue and in the associated regulatory asset or liability accounts in advance of rate adjustments intended to collect or return the amounts recognized. Revenues recognized for the adjustment to the benchmarks noted are required to be presented separately from revenues from contracts with customers, as such, these revenues are disaggregated in the table below as Alternative revenue program revenues.
Southwest Gas’ operating revenues, but not its operating margin, are directly impacted by variability between comparative periods in the cost of natural gas procured for customers as these costs are incorporated in customer rates. When included in rates (for customers except those taking transportation-only service), these costs are passed through to customers generally dollar-for-dollar without markup. Operating margin is a non-GAAP financial measure and should be considered in addition to, not as a substitute for, measures of financial performance prepared in accordance with GAAP. Southwest Gas’ revenues overall, reflected on the Consolidated Statements of Income of both the Company and Southwest Gas, include revenue from contracts with customers, which is shown below disaggregated by customer type, in addition to other categories of revenue:
| | | | | | | | | | | | | | | | | | | | |
| | | December 31, |
| (Thousands of dollars) | | 2025 | | 2024 | | 2023 |
Residential | | $ | 1,276,677 | | | $ | 1,654,685 | | | $ | 1,725,223 | |
| Small commercial | | 333,408 | | | 493,709 | | | 513,366 | |
| Large commercial | | 72,367 | | | 111,350 | | | 117,973 | |
Industrial and other | | 44,941 | | | 62,997 | | | 75,219 | |
Transportation | | 116,579 | | | 115,782 | | | 104,298 | |
| Revenue from contracts with customers | | 1,843,972 | | | 2,438,523 | | | 2,536,079 | |
Alternative revenue program revenues | | 86,593 | | | 23,055 | | | (52,365) | |
Other revenues (1) | | 9,815 | | | 13,638 | | | 15,850 | |
Total Regulated operations revenues (2)(3)(4) | | $ | 1,940,380 | | | $ | 2,475,216 | | | $ | 2,499,564 | |
(1) Amounts include late fees and other miscellaneous revenues and may also include the impact of certain regulatory mechanisms.
(2) The amounts differ from Southwest Gas due to the revision discussed in Note 3 - Revision of Previously Issued Financial Statements.
(3) The Company’s Total Regulated operations revenues differ from Southwest Gas due to the revision discussed in Note 3 - Revision of Previously Issued Financial Statements.
(4) The Company’s revenues for the period ended December 31, 2023 represent the amounts for the Natural Gas Distribution segment and do not include amounts attributable to MountainWest. As these amounts are not material, management has not provided disaggregated revenue disclosures.
As of December 31, 2025, the Company and Southwest had backlog performance obligations through Great Basin, excluding intercompany transactions, totaling $58.2 million for the next four years. Of the current backlog, $15.9 million is expected to be fulfilled within the year ended December 31, 2026. $15.9 million within the year ended December 31, 2027, $15.9 million within the year ended December 31, 2028, and $10.5 million within the year ended December 31, 2029. Under the terms of Great Basin’s current settlement agreement, new rates will become effective no later than September 1, 2029. Accordingly, the Company and Southwest Gas are unable to reasonably estimate performance obligations that may arise beyond September 1, 2029. The backlog consists of firm customer contracts for natural gas distribution services. Seasonal fluctuation may impact the timing of fulfillment as demand for natural gas typically increases during winter months. The Company defines backlog as the aggregate value of signed contracts for which performance obligations remain unsatisfied.