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Regulatory Matters - Narrative (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Regulatory matters: |  |
Net regulatory Assets | $ 75,061,000 | $ 69,507,000
Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Net regulatory Assets | 75,100,000 |
Regulatory asset | 157,800,000 |
Regulatory liability | $ 82,700,000 |
Commercial paper, term | 90 days |
Regulatory asset not accruing carrying costs | $ 23,200,000 |
Regulatory liabilities not accruing carrying costs | 77,800,000 |
Golden State Water Company and Bear Valley Electric Service Inc. | Deferred Income Tax Charge |  |
Regulatory matters: |  |
Regulatory liabilities not accruing carrying costs | 73,000,000.0 |
Golden State Water Company and Bear Valley Electric Service Inc. | Pension Costs and Other Postretirement Benefit Costs |  |
Regulatory matters: |  |
Regulatory liabilities not accruing carrying costs | 3,300,000 |
GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 44,803,000 | 45,729,000
GSWC | Deferred Income Tax Charge |  |
Regulatory matters: |  |
Net regulatory Assets | (69,257,000) | (70,189,000)
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |
Regulatory matters: |  |
Net regulatory Assets | (4,824,000) | (4,867,000)
BVES |  |
Regulatory matters: |  |
Regulatory Asset -incremental vegetation management costs | 13,900,000 |
Regulatory asset- wildfire mitigation plans (WMP) | 7,000,000 |
Flowed-through deferred income taxes, net | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 10,700,000 |
Flowed-through deferred income taxes, net | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 8,919,000 | 3,190,000
Derivative instrument memorandum account (Note 5) |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 8,300,000 |
Derivative instrument memorandum account (Note 5) | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 8,320,000 | 2,360,000
Other Regulatory assets | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 4,200,000 |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 41,656,000 | 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 | $ 16,000,000.0 |
Regulatory asset recovery periods | 24 months |
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 44,092,000 | $ 41,545,000
Regulatory asset recovery periods | 18 months |
Water Revenue Adjustment Mechanism ("WRAM") |  |
Regulatory matters: |  |
Deferred revenue, revenue recognized | $ 0 |
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 47,400,000 |
Modified Cost Balancing account ("MCBA") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ (3,300,000) |

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