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Regulatory Matters - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Regulatory matters: |  |
Net regulatory Assets | $ 59,592,000 | $ 54,679,000
Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Net regulatory Assets | 59,600,000 |
Regulatory asset | 153,600,000 |
Regulatory liability | $ 94,000,000 |
Commercial paper, term | 90 days |
Regulatory asset not accruing carrying costs | $ 31,800,000 |
Regulatory liabilities not accruing carrying costs | 90,800,000 |
Golden State Water Company and Bear Valley Electric Service Inc. | Deferred Income Tax Charge |  |
Regulatory matters: |  |
Regulatory liabilities not accruing carrying costs | 67,500,000 |
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 | 23,300,000 |
GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 17,221,000 | 18,173,000
GSWC | Deferred Income Tax Charge |  |
Regulatory matters: |  |
Net regulatory Assets | (63,610,000) | (63,682,000)
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |
Regulatory matters: |  |
Net regulatory Assets | (24,115,000) | (25,179,000)
BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 42,371,000 | 36,506,000
Flowed-through deferred income taxes, net | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 15,700,000 |
Flowed-through deferred income taxes, net | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 13,909,000 | 12,506,000
Derivative instrument memorandum account (Note 5) |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 13,100,000 |
Derivative instrument memorandum account (Note 5) | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 13,094,000 | 8,823,000
Other Regulatory assets | Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 3,000,000.0 |
2025 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 4,416,000 | 0
Amortization period | 12 months |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 34,494,000 | 37,711,000
Amortization period | 36 months |
Water revenue adjustment mechanism, net of modified cost balancing account |  |
Regulatory matters: |  |
Regulatory asset recovery periods | 24 months |
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 23,421,000 | 29,738,000
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 | 22,600,000 |
Modified Cost Balancing account ("MCBA") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 800,000 |
2023/2024 General Rate Case Memorandum accounts ( unbilled revenue) | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | $ 10,036,000 | 9,777,000
Amortization period | 36 months |
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | $ 14,755,000 | $ 14,681,000
Vegetation management and other WMP memorandum accounts | BVES | Minimum |  |
Regulatory matters: |  |
Amortization period | 24 months |
Vegetation management and other WMP memorandum accounts | BVES | Maximum |  |
Regulatory matters: |  |
Amortization period | 36 months |

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