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Regulatory Matters - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2025 | Aug. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 29,184 |  | $ 54,679
Receivables from litigation settlement |  |  | 12,327 |  | 6,415
Golden State Water Company and Bear Valley Electric Service Inc. |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | 29,200 |  |
Regulatory asset |  |  | 135,900 |  |
Regulatory liability |  |  | $ 106,700 |  |
Commercial paper, term |  |  | 90 days |  |
Regulatory asset not accruing carrying costs |  |  | $ 38,300 |  |
Regulatory liabilities not accruing carrying costs |  |  | 102,600 |  |
Golden State Water Company and Bear Valley Electric Service Inc. | Deferred Income Tax Charge |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory liabilities not accruing carrying costs |  |  | 67,200 |  |
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 |  |  | 23,000 |  |
Golden State Water Company and Bear Valley Electric Service Inc. | PFAS Contamination Litigation Proceeds Memorandum Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory liabilities not accruing carrying costs |  |  | 12,400 |  |
GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | (13,874) |  | 18,173
Litigation settlement, amount awarded |  |  | 19,000 |  |
Receivables from litigation settlement |  |  | 10,703 |  | 3,122
Proceeds from legal settlements |  | $ 3,800 |  |  |
Litigation settlement, amounts expected to be received |  |  | 6,500 |  |
GSWC | Subsequent Event |  |  |  |  |
Regulatory matters: |  |  |  |  |
Proceeds from legal settlements | $ 12,500 |  |  |  |
GSWC | Legal settlement receivable |  |  |  |  |
Regulatory matters: |  |  |  |  |
Receivables from litigation settlement |  |  |  | $ 12,500 |
GSWC | Deferred Income Tax Charge |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | (63,464) |  | (63,682)
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | (24,578) |  | (25,179)
GSWC | PFAS Contamination Litigation Proceeds Memorandum Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | (12,393) |  | 0
BVES |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | 43,058 |  | 36,506
Flowed-through deferred income taxes, net | Golden State Water Company and Bear Valley Electric Service Inc. |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  | 21,000 |  |
Flowed-through deferred income taxes, net | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | 18,668 |  | 12,506
Derivative instrument memorandum account (Note 5) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  | 14,300 |  |
Derivative instrument memorandum account (Note 5) | BVES |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | 14,275 |  | 8,823
Other Regulatory assets | Golden State Water Company and Bear Valley Electric Service Inc. |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  | 3,000 |  |
2025 general rate case memorandum accounts (unbilled revenue) | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 2,614 |  | 0
Amortization period |  |  | 12 months |  |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 25,864 |  | 37,711
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 12,752 |  | 29,738
Regulatory asset recovery periods |  |  | 18 months |  |
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 12,300 |  |
Modified Cost Balancing account ("MCBA") | GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | 500 |  |
2023/2024 General Rate Case Memorandum accounts ( unbilled revenue) | BVES |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 8,949 |  | 9,777
Amortization period |  |  | 36 months |  |
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net regulatory Assets |  |  | $ 13,030 |  | $ 14,681
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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