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Regulatory Matters - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Regulatory matters: |  |
Net regulatory Assets | $ 80,052,000 | $ 69,507,000
GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 53,314,000 | 45,729,000
BVES |  |
Regulatory matters: |  |
Regulatory Asset -incremental vegetation management costs | 13,300,000 |
Regulatory asset- wildfire mitigation plans (WMP) | 6,600,000 |
Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 61,300,000 |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 46,527,000 | 52,795,000
Amortization period | 36 months |
Water revenue adjustment mechanism, net of modified cost balancing account |  |
Regulatory matters: |  |
Increase (decrease) in other regulatory assets | $ 15,300,000 |
Regulatory asset recovery periods | 24 months |
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 50,842,000 | 41,545,000
Commercial paper, term | 90 days |
Regulatory asset recovery periods | 18 months |
Deferred Income Tax Charge [Member] | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ (69,567,000) | (70,189,000)
Deferred Income Tax Charge [Member] | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 73,300,000 |
Derivative instrument memorandum account (Note 5) |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 5,600,000 |
Derivative instrument memorandum account (Note 5) | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 5,593,000 | 2,360,000
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | (4,828,000) | (4,867,000)
Pension Costs and Other Postretirement Benefit Costs [Member] | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 3,500,000 |
Modified Cost Balancing account ("MCBA") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | (3,800,000) |
Water Revenue Adjustment Mechanism ("WRAM") |  |
Regulatory matters: |  |
Deferred Revenue, Revenue Recognized | 0 |
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 54,600,000 |
Electric Supply Cost Adjustment Mechanism | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 777,000 | 2,583,000
Low income rate assistance balancing accounts | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 7,747,000 | 5,763,000
Flowed-through deferred income taxes, net | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 5,667,000 | $ 3,190,000
Flowed-through deferred income taxes, net | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Net regulatory Assets | $ 7,200,000 |

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