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Regulatory Matters - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 54,679,000 | $ 69,507,000
Golden State Water Company and Bear Valley Electric Service, Inc. |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 54,700,000 |
Regulatory assets | 149,800,000 |
Regulatory liability | $ 95,100,000 |
Commercial paper, term | 90 days |
Regulatory asset not accruing carrying costs | $ 26,300,000 |
Regulatory liabilities not accruing carrying costs | 92,100,000 |
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 18,173,000 | $ 45,729,000
Discount percentage for qualified low income water customers | 20.00% |
GSWC | Cost of capital proceeding |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Approved equity capital structure, percentage |  | 57.00%
Approved debt capital structure, percentage |  | 43.00%
Cost of debt, percentage |  | 5.10%
Approved return on equity, percentage |  | 8.85%
Term for the cost of capital proceeding |  | 3 years
Revenue impact due to lower cost of debt |  | $ 6,400,000
BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 36,506,000 | 23,778,000
Discount percentage for qualified low income water customers | 20.00% |
Incremental vegetation management costs | $ 9,900,000 |
Regulatory asset wildfire mitigation plans WMP | 4,800,000 |
Flowed-through deferred income taxes, net (Note 11) | Golden State Water Company and Bear Valley Electric Service, Inc. |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory asset not accruing carrying costs | 14,300,000 |
Flowed-through deferred income taxes, net (Note 11) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 12,506,000 | 3,190,000
Derivative instrument memorandum account (Note 5) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory asset not accruing carrying costs | 8,800,000 |
Derivative instrument memorandum account (Note 5) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 8,823,000 | 2,360,000
Other Regulatory Assets | Golden State Water Company and Bear Valley Electric Service, Inc. |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory asset not accruing carrying costs | 3,200,000 |
Other Regulatory Assets | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 11,352,000 | 10,661,000
Other Regulatory Assets | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 8,853,000 | 10,280,000
Excess deferred income taxes (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 67,500,000 |
Pensions and other post-retirement obligations (Note 12) | Golden State Water Company and Bear Valley Electric Service, Inc. |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liabilities not accruing carrying costs | 23,500,000 |
Pensions and other post-retirement obligations (Note 12) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 23,500,000 |
Pensions and other post-retirement obligations (Note 12) | GSWC | Under Collection in Two Way Pension Balancing Account |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 1,700,000 |
Other Regulatory Liabilities | Golden State Water Company and Bear Valley Electric Service, Inc. |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liabilities not accruing carrying costs | 1,100,000 |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 37,700,000 |
Regulatory assets | $ 37,711,000 | 52,795,000
Water revenue adjustment mechanism, net of the modified cost balancing account |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Recovery period | 18 months |
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 29,700,000 |
Regulatory assets | $ 29,738,000 | 41,545,000
Commercial paper, term | 90 days |
Recovery period | 24 months |
Water Revenue Adjustment Mechanism |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory adjustment increase (decrease) | $ 8,000,000.0 |
Deferred revenues | 0 |
Water Revenue Adjustment Mechanism | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 29,100,000 |
Modified Cost Balancing Account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 600,000 |
Low income rate assistance balancing accounts | Golden State Water Company and Bear Valley Electric Service, Inc. |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 8,800,000 |
Low income rate assistance balancing accounts | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 8,834,000 | 5,763,000
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | $ 14,681,000 | 17,716,000
Regulatory asset, amortization period | 36 months |
Filing term for the Wildfire Mitigation and Other Fire Prevention related costs balancing and memorandum accounts | 90 days |
2023/2024 general rate case memorandum accounts (unbilled revenue) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 9,800,000 |
Regulatory assets | $ 9,777,000 | $ 0
Regulatory asset, amortization period | 36 months |
Filing term for the Wildfire Mitigation and Other Fire Prevention related costs balancing and memorandum accounts | 90 days |

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