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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 182,716 | $ 161,782 | $ 493,795 | $ 452,361
GOLDEN STATE WATER COMPANY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 132,323 | 124,043 | 354,023 | 324,732
Water: | GOLDEN STATE WATER COMPANY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 132,961 | 121,356 | 354,393 | 304,791
Total operating revenues | 132,323 | 124,043 | 354,023 | 324,732
Electric: | BVES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 12,984 | 8,919 | 39,924 | 30,561
Total operating revenues | 13,332 | 9,040 | 41,262 | 29,948
Contracted services: | ASUS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 37,061 | 28,699 | 98,510 | 97,681
Tariff-based revenues | Water: | GOLDEN STATE WATER COMPANY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 130,229 | 119,716 | 347,800 | 300,442
Tariff-based revenues | Electric: | BVES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 11,823 | 8,892 | 37,336 | 30,431
CPUC-approved surcharges (cost-recovery activities) | Water: | GOLDEN STATE WATER COMPANY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 2,052 | 946 | 4,613 | 2,405
CPUC-approved surcharges (cost-recovery activities) | Electric: | BVES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 1,161 | 27 | 2,588 | 130
Other | Water: | GOLDEN STATE WATER COMPANY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 680 | 694 | 1,980 | 1,944
Alternative revenues program | Water: | GOLDEN STATE WATER COMPANY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue programs, net | (638) | 2,687 | (370) | 19,941
Alternative revenues program | Electric: | BVES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue programs, net | 348 | 121 | 1,338 | (613)
Water | Contracted services: | ASUS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 20,992 | 14,651 | 52,002 | 57,821
Wastewater | Contracted services: | ASUS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | $ 16,069 | $ 14,048 | $ 46,508 | $ 39,860

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