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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | $ 77,569 | $ 69,507
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 51,548 | 45,729
GSWC | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (304) | (268)
BVES | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (8,848) | (6,578)
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 50,010 | 52,795
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 47,529 | 41,545
Deferred Income Tax Charge [Member] | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (69,878) | (70,189)
Other regulatory assets | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 10,600 | 10,661
Other regulatory assets | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 7,795 | 7,697
Derivative instrument memorandum account (Note 5) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 6,168 | 2,360
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 18,638 | 17,716
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (4,861) | (4,867)
Low income rate assistance balancing accounts | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 6,846 | 5,763
Asset retirement obligations | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 7,258 | 7,099
Electric Supply Cost Adjustment Mechanism | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 2,268 | 2,583
Flowed-through deferred income taxes, net |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 5,600 |
Flowed-through deferred income taxes, net | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | $ 4,348 | $ 3,190

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