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Revenues
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Most of Registrant’s revenues are derived from contracts with customers, including tariff-based revenues from its regulated utilities at GSWC and BVES. ASUS’s initial firm fixed-price long-term contracts 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. Accordingly, 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 sheets.
Although GSWC and BVES have a diversified customer base of residential, commercial, industrial, and other customers, revenues derived from residential and commercial customers generally account for approximately 90% of total water and electric revenues. Most of ASUS’s revenues are derived from the U.S. government. For the three and six months ended June 30, 2024 and 2023, disaggregated revenues from contracts with customers by segment were as follows:
Three Months Ended June 30,
Six Months Ended June 30,
(dollars in thousands)2024202320242023
Water:
Tariff-based revenues$96,065 $98,378 $180,726 $198,919 
CPUC-approved surcharges (cost-recovery activities)912 558 1,459 875 
Other668 649 1,250 1,386 
     Water revenues from contracts with customers97,645 99,585 183,435 201,180 
WRAM under/(over)-collection (alternative revenue program)12,779 17,323 17,254 28,440 
    Total water revenues (1)
110,424 116,908 200,689 229,620 
Electric:
Tariff-based revenues8,866 8,929 21,539 21,992 
CPUC-approved surcharges (cost-recovery activities)29 117 103 266 
     Electric revenues from contracts with customers8,895 9,046 21,642 22,258 
BRRAM under/(over)-collection (alternative revenue program)(192)(218)(734)(526)
     Total electric revenues8,703 8,828 20,908 21,732 
Contracted services:
Water 21,603 19,181 43,170 41,669 
Wastewater14,598 12,483 25,812 25,802 
     Contracted services revenues from contracts with customers36,201 31,664 68,982 67,471 
     Total AWR revenues$155,328 $157,400 $290,579 $318,823 
(1) Water revenues for the six months ended June 30, 2023 include approximately $32 million recorded 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, the three and six months ended June 30, 2023 include an increase in water revenues of $9.3 million and $6.4 million, respectively, from the reversal of revenues subject to refund due to a change in estimates from what had been recorded during 2022 and the first quarter of 2023.
The opening and closing balances of the receivable from the U.S. government, contract assets, and contract liabilities from contracts with customers, which are related entirely to ASUS, were as follows:    
(dollars in thousands)June 30, 2024December 31, 2023
Unbilled receivables$10,518 $9,693 
Receivable from the U.S. government$90,330 $91,489 
Contract assets$19,063 $14,378 
Contract liabilities$1,239 $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 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 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 six months ended June 30, 2024, which were included in contract liabilities at the beginning of the period were not material. Contracted services revenues recognized during the six months ended June 30, 2024 from performance obligations satisfied in previous periods were also not material.
As of June 30, 2024, AWR’s aggregate remaining performance obligations, which are entirely from the contracted services segment, were $4.0 billion. ASUS expects to recognize revenue on these remaining performance obligations over the remaining term of each of the contracts, which range from 15 to 50 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 convenience of the U.S. government.