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Revenues
 12 Months Ended
Dec. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Most of Registrant’s revenues are accounted for under the revenue recognition accounting standard, “Revenue from Contracts with Customers - (Topic 606).”
GSWC and BVES provide utility services to customers as specified by the CPUC. The transaction prices for water and electric revenues are based on tariff rates authorized by the CPUC, which include both quantity-based and flat-rate charges. Tariff revenues represent the adopted revenue requirement authorized by the CPUC intended to provide GSWC and BVES with an opportunity to recover its costs and earn a reasonable return on its net capital investment. The annual revenue requirements are comprised of supply costs, operation and maintenance costs, administrative and general costs, depreciation and taxes in amounts authorized by the CPUC, and a return on rate base consistent with the capital structure authorized by the CPUC.
Water and electric revenues are recognized over time as customers simultaneously receive and use the utility services provided. Water and electric revenues include amounts billed to customers on a cyclical basis, nearly all of which are based on meter readings for services provided. Customer bills also include surcharges for cost-recovery activities, which represent CPUC-authorized balancing and memorandum accounts that allow for the recovery of previously incurred operating costs. Revenues from these surcharges have no impact to earnings as they are offset by corresponding increases in operating expenses to reflect the recovery of the associated costs. Customer payment terms are approximately 20 business days from the billing date. Unbilled revenues are amounts estimated to be billed for usage since the last meter-reading date to the end of the accounting period. The most recent customer billed usage forms the basis for estimating unbilled revenue.
GSWC and BVES bill certain sales and use taxes levied by state or local governments to its customers. Included in these sales and use taxes are franchise fees, which are paid to various municipalities and counties (based on their ordinances) in order to use public rights of way for utility purposes. GSWC and BVES bill these franchise fees to its customers based on a CPUC-authorized rate for each ratemaking area as applicable. These franchise fees, which are required to be paid regardless of GSWC’s or BVES’s ability to collect them from its customers, are accounted for on a gross basis. Franchise fees billed to customers and recorded as operating revenue were approximately $4.6 million, $4.9 million and $4.0 million for the years ended December 31, 2024, 2023 and 2022, respectively. When GSWC or BVES acts as an agent, where the tax is not required to be remitted if it is not collected from customers, the tax is accounted for on a net basis.
As currently authorized by the CPUC, GSWC and BVES record in revenues the difference between the adopted level of volumetric revenues as authorized by the CPUC for metered accounts (volumetric revenues) and the actual volumetric revenues recovered in customer rates.  For GSWC, the difference is tracked under the Water Revenue Adjustment Mechanism (“WRAM”) regulatory accounts, and for BVES the difference is tracked in the Base Revenue Requirement Adjustment Mechanism (“BRRAM”) regulatory account. If this difference results in an under-collection of revenues, additional revenue is recorded only to the extent that the difference is expected to be collected within 24 months following the end of the year in which they are recorded in accordance with Accounting Standards Codification (“ASC”) Topic 980, Regulated Operations.
ASUS’s initial 50-year firm fixed-price contract and additional firm fixed-price contracts, together referred to as (“50-year contract”) with the U.S. government are considered service concession arrangements under ASC 853 Service Concession Arrangements. ASUS’s military base contracts consist primarily of 50-year contracts and one 15-year contract with the U.S. government. These contracts are subject to annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations, and additions to the contract value for new construction of facilities at the military bases. The services under these contracts are accounted for under Topic 606 Revenue from Contracts with Customers and the water and/or wastewater systems are not recorded as Property, Plant and Equipment on Registrant’s balance sheet. For ASUS, performance obligations consist of (i) performing ongoing operation and maintenance of the water and/or wastewater systems and treatment plants for each military base served, and (ii) performing construction activities (including renewal and replacement capital work) on each military base served. The transaction price for each performance obligation is either delineated in, or initially derived from, the applicable 50-year contract and/or any subsequent contract modifications. Depending on the state in which operations are conducted, ASUS’s subsidiaries are also subject to certain state non-income tax assessments, which are accounted for on a gross basis and have been immaterial to date.
The ongoing performance of operation and maintenance of the water and/or wastewater systems and treatment plants is viewed as a single performance obligation for each of the contract with the U.S. government. Registrant recognizes revenue for operations and maintenance fees monthly using the “right to invoice” practical expedient under ASC Topic 606. ASUS has a right to the consideration from the U.S. government in an amount that corresponds directly to the value for services provided to the U.S. government based on its subsidiaries' performance completed to-date. The contractual operations and maintenance fees are firm-fixed, and the level of effort or resources expended in the performance of the operations-and-maintenance-fees performance obligation is largely consistent over the contract term. Therefore, Registrant has determined that the monthly amounts invoiced for operations and maintenance performance are a fair reflection of the value transferred to the U.S.
government. Invoices to the U.S. government for operations and maintenance service, as well as construction activities, are due upon receipt.
ASUS’s construction activities consist of various projects to be performed. Each of these capital upgrade projects’ transaction prices are delineated either in the 50-year contract or through a specific contract modification for each construction project, which includes the transaction price for that project, or through a task order under a task order agreement. For renewal and replacement projects, the initial transaction price is based on the individual scope of work in accordance with contractual unit prices within the 50-year contract. Each construction project is viewed as a separate, single performance obligation. Therefore, it is generally unnecessary to allocate a construction transaction price to more than one construction performance obligation. Revenues for construction activities are recognized over time, with progress toward completion measured based on the input method using costs incurred relative to the total estimated costs (cost-to-cost method). Due to the nature of these construction projects, Registrant has determined the cost-to-cost input measurement to be the best method to measure progress towards satisfying its construction contract performance obligations, as compared to using an output measurement such as units produced. Changes in job performance, job site conditions, change orders and/or estimated profitability may result in revisions to costs and income for ASUS, and are recognized in the period in which any such revisions are determined. Pre-contract costs for ASUS, which consist of design and engineering labor costs, are deferred if recovery is probable, and are expensed as incurred if recovery is not probable.  Deferred pre-contract costs have been immaterial to date.
Contracted services revenues recognized during the years ended December 31, 2024, 2023 and 2022 from performance obligations satisfied in previous periods were not material.
Although GSWC and BVES have a diversified base of residential, commercial, industrial and other customers, revenues derived from residential and commercial customers account for nearly 90% of total water revenues, and 90% of total electric revenues. The vast majority of ASUS’s revenues are from the U.S. government. For the years ended December 31, 2024, 2023, and 2022, disaggregated revenues from contracts with customers by segment are as follows:
(dollar in thousands)For The Year Ended December 31, 2024For The Year Ended December 31, 2023For The Year Ended December 31, 2022
Water:
Tariff-based revenues$405,756 $394,623 $324,838 
CPUC-approved surcharges (cost-recovery activities)2,914 2,955 2,461 
Other2,646 2,753 2,351 
Water revenues from contracts with customers
411,316 400,331 329,650 
WRAM under/(over)-collection (alternative revenue program)6,094 33,142 10,952 
Total water revenues (1)
417,410 433,473 340,602 
Electric:
Tariff-based revenues50,628 40,130 39,750 
CPUC-approved surcharges (cost-recovery activities)173 567 144 
Electric revenues from contracts with customers
50,801 40,697 39,894 
BRRAM under/(over)-collection (alternative revenue program)844 1,135 92 
Total electric revenues (2)
51,645 41,832 39,986 
Contracted services:
Water 72,951 75,785 68,626 
Wastewater53,453 44,609 42,314 
Contracted services revenues from contracts with customers126,404 120,394 110,940 
Total AWR revenues
$595,459 $595,699 $491,528 
(1) Water revenues for the year ended December 31, 2023 includes approximately $32 million from the impact of retroactive revenues for the full year of 2022 as a result of the CPUC’s approval of GSWC’s general rate case in June 2023. Furthermore, the CPUC also issued a final decision in June 2023 on GSWC’s cost of capital proceeding. As a result of the final cost of capital decision, for the year ended December 31, 2023, water revenues include $6.4 million from the reversal of revenues subject to refund due to a change in estimates from what had been recorded during 2022.
(2) Electric revenues for the year ended December 31, 2024 include $3.7 million from the retroactive impact of revenues for the full year of 2023, resulting from the CPUC's approval of BVES’s general rate case (Note 3).
The opening and closing balances of the receivable from the U.S. government, contract assets and contract liabilities from contracts with customers, which related entirely to ASUS, are as follows:    
(dollar in thousands)December 31, 2024December 31, 2023
Unbilled receivables$10,910 $9,693 
Receivable from the U.S. government$76,486 $91,489 
Contract assets$21,648 $14,378 
Contract liabilities$5,662 $1,352 
    Unbilled receivables and receivable from the U.S. government represent receivables where the right to payment is conditional only by the passage of time.
Contract Assets - Contract assets are assets of ASUS and its subsidiaries and consist of unbilled revenues recognized from work-in-progress construction projects, where the right to payment is conditional on something other than the passage of time. The classification of this asset as current or noncurrent is based on the timing of when ASUS expects to bill these amounts.
Contract Liabilities - Contract liabilities are liabilities of ASUS and its subsidiaries and consist of billings in excess of revenue recognized. The classification of this liability as current or noncurrent is based on the timing of when ASUS expects to recognize revenue. Revenues for the year ended December 31, 2024 included in contract liabilities at the beginning of the period were not material.
As of December 31, 2024, AWR’s aggregate remaining performance obligations, which are entirely from the contracted services segment, were $4.1 billion. ASUS expects to recognize revenue on these remaining performance obligations over the remaining term of each of the contracts, with the remaining contract terms that range from 14 to 49 years. Each of the contracts with the U.S. government is subject to termination, in whole or in part, prior to the end of its contract term for the convenience of the U.S. government.