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Regulatory Matters - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2023 | Dec. 31, 2022 USD ($) | Feb. 28, 2022 USD ($) | Jan. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2024 | Dec. 31, 2023 USD ($) | Sep. 30, 2023 | Dec. 31, 2022 USD ($)
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  |  |  |  |  | $ 68,400,000 |  |
Total |  | $ (25,454,000) |  |  |  |  | $ 69,507,000 |  | $ (25,454,000)
Cost of capital proceeding |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Debt Capital Structure in May 2021 Cost of Capital Application, Percentage |  |  |  |  |  |  | 5.10% |  |
Public Utilities Approved Debt Capital Structure, Percentage Previously Authorized |  |  |  |  |  |  | 6.60% |  |
Public Utilities, Approved Return On Equity in May 2021 Cost of Capital Application, Percentage |  |  |  |  |  |  | 0.0885 |  |
Public Utilities, Approved Return on Equity, Percentage, Previously Authorized |  |  |  |  |  |  | 8.90% |  |
Term for the cost of capital proceeding |  |  |  |  |  |  | 3 years |  |
Threshold percentage of Moody's average bond rate used adjusting return on equity and rate of return on rate base, Increase(Decrease) |  |  |  |  |  |  | 0.0100 |  |
Triggers for the WCMA adjustment, Impact of 102.8 Basis Point Increase in Moody's Rate, Percent |  |  |  |  |  |  | 0.010280 |  |
Public Utilities, Requested Return on Equity, Percentage | 9.36% |  |  |  |  |  |  |  |
Triggers for the WCMA adjustment, Impact of 139.7 Basis Point Increase in Moody's Rate, Percent |  |  |  |  |  |  |  | 0.013970 |
Adjustment To Return On Equity, If More Than 100 Basis Point Change |  |  |  |  |  |  | 0.5 |  |
Cost of capital proceeding | Subsequent Event |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  | 10.06% |  |  |
GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | (26,574,000) |  |  |  |  | $ 45,729,000 |  | (26,574,000)
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  |  |  | 57.00% |  |
Public Utilities, Approved Debt Capital Structure, Percentage |  |  |  |  |  |  | 43.00% |  |
Revenue impact due to lower cost of debt |  |  |  |  |  |  | $ 6,400,000 |  |
Relief funding |  |  |  | $ 9,500,000 |  |  | 3,500,000 |  | 9,500,000
Regulatory Asset CEMA |  |  |  |  |  |  | $ 1,200,000 |  |
Discount Percentage For Qualified Low Income Water Customers |  |  |  |  |  |  | 20.00% |  |
BVES |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Relief funding |  | 152,000 | $ 321,000 |  |  |  |  |  | 473,000
Regulatory Asset CEMA |  |  |  |  |  |  | $ 500,000 |  |
Discount Percentage For Qualified Low Income Water Customers |  |  |  |  |  |  | 20.00% |  |
Incremental vegetation management costs |  |  |  |  |  |  | $ 11,800,000 |  |
Regulatory Asset Wildfire Mitigation Plans WMP |  |  |  |  |  |  | 5,900,000 |  |
Regulatory Asset CEMA -2023 Storm |  |  |  |  |  |  | $ 1,300,000 |  |
2022/2023 general rate case memorandum accounts (unbilled revenue) |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Asset, Amortization Period |  |  |  |  |  |  | 36 months |  |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 0 |  |  |  |  | $ 52,795,000 |  | 0
Water revenue adjustment mechanism, net of the modified cost balancing account |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Regulatory adjustment |  |  |  |  | $ (9,800,000) |  |  |  |
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 31,803,000 |  |  |  |  | $ 41,545,000 |  | 31,803,000
Regulatory Asset, Amortization Period |  |  |  |  |  |  | 24 months |  |
Commercial paper, term |  |  |  |  |  |  | 90 days |  |
Pensions and other post-retirement obligations (Note 12) |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  |  |  |  |  | $ 3,800,000 |  |
Pensions and other post-retirement obligations (Note 12) | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 738,000 |  |  |  |  | (4,867,000) |  | 738,000
Regulatory Assets |  |  |  |  |  |  | 3,800,000 |  |
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] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 1,100,000 |  |
Pensions and other post-retirement obligations (Note 12) | BVES | Under Collection in Two Way Pension Balancing Account |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 277,000 |  |
Excess deferred income taxes (Note 11) |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 74,000,000 |  |
Excess deferred income taxes (Note 11) | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | (71,870,000) |  |  |  |  | (70,189,000) |  | (71,870,000)
Flowed-through deferred income taxes, net (Note 11) |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 4,300,000 |  |
Flowed-through deferred income taxes, net (Note 11) | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | (1,134,000) |  |  |  |  | 3,190,000 |  | (1,134,000)
Low income rate assistance balancing accounts | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 2,526,000 |  |  |  |  | 5,763,000 |  | 2,526,000
Low income rate assistance balancing accounts | Golden State Water Company and Bear Valley Electric Service, Inc. |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 5,700,000 |  |
Derivative instrument memorandum account (Note 5) |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 2,400,000 |  |
Derivative instrument memorandum account (Note 5) | BVES |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | (11,847,000) |  |  |  |  | 2,360,000 |  | (11,847,000)
Water Revenue Adjustment Mechanism |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Regulatory adjustment |  |  |  |  |  |  | 30,100,000 |  |
Water Revenue Adjustment Mechanism | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 43,900,000 |  |
Deferred Revenues |  |  |  |  |  |  | 0 |  |
Modified Cost Balancing Account | GSWC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 2,400,000 |  |
Electric supply cost adjustment mechanism | BVES |  |  |  |  |  |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Total |  | $ 3,627,000 |  |  |  |  | 2,583,000 |  | $ 3,627,000
Amount billed to customers as surcharges |  |  |  |  |  |  | $ 1,900,000 |  |

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