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Regulatory Matters - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Asset Not Accruing Carrying Costs | $ 85,000,000 |
Net regulatory assets | (25,454,000) | $ (22,796,000)
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ (26,574,000) | (24,082,000)
Number of unresolved issues for 2022-2024 water General Rate Case | 3 |
Regulatory Asset CEMA | $ 3,500,000 |
GSWC | Cost of capital proceeding |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Revenue impact due to lower cost of debt | 6,400,000 |
BVESI |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Asset CEMA | 497,000 |
Approval amount for the relief funding | 473,000 |
Incremental vegetation management costs | 8,700,000 |
Regulatory Asset Wildfire Mitigation Plans WMP | 4,300,000 |
Excess deferred income taxes (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 75,700,000 |
Excess deferred income taxes (Note 11) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (71,870,000) | (73,000,000)
Flow-through taxes, net (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (1,100,000) |
Flow-through taxes, net (Note 11) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (1,134,000) | (5,552,000)
Pensions and other post-retirement obligations (Note 12) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Asset Not Accruing Carrying Costs | 2,200,000 |
Pensions and other post-retirement obligations (Note 12) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 738,000 | 25,212,000
Regulatory Assets | 2,200,000 |
Pensions and other post-retirement obligations (Note 12) | Golden State Water Company and Bear Valley Electric Service, Inc. | Under Collection in Two Way Pension Balancing Account |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 1,500,000 |
Pensions and other post-retirement obligations (Note 12) | BVESI | Under Collection in Two Way Pension Balancing Account |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 496,000 |
Derivative instrument memorandum account (Note 5) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (11,800,000) |
Derivative instrument memorandum account (Note 5) | BVESI |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (11,847,000) | (4,441,000)
Water Revenue Adjustment Mechanism, net of the Modified Cost Balancing Account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 31,803,000 | 13,326,000
Commercial paper, term | 90 days |
Amount billed to customers as surcharges | $ 4,400,000 |
Water Revenue Adjustment Mechanism, net of the Modified Cost Balancing Account | GSWC | Maximum |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Asset Recovery Periods | 24 months |
Water Revenue Adjustment Mechanism |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory adjustment | $ 22,800,000 |
Water Revenue Adjustment Mechanism | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 17,200,000 |
Deferred Revenues | 0 |
Modified Cost Balancing Account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 14,600,000 |
COVID-19 memorandum account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 3,478,000 | $ 1,663,000
Approval amount for the relief funding | $ 9,500,000 |

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