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Regulatory Matters - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ (62,800,000) |
Net regulatory Assets | 77,569,000 | $ 69,507,000
Regulatory asset amount billed to customers as surcharges | 0 |
GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 51,548,000 | 45,729,000
BVES |  |
Regulatory matters: |  |
Regulatory Asset -incremental vegetation management costs | 12,500,000 |
Regulatory asset- wildfire mitigation plans (WMP) | 6,200,000 |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 50,010,000 | 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 | $ 8,000,000 |
Regulatory asset recovery periods | 24 months |
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 47,529,000 | 41,545,000
Commercial paper, term | 90 days |
Deferred Income Tax Charge [Member] |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ (73,700,000) |
Deferred Income Tax Charge [Member] | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | (69,878,000) | (70,189,000)
Derivative instrument memorandum account (Note 5) |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | (6,200,000) |
Derivative instrument memorandum account (Note 5) | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 6,168,000 | 2,360,000
Pension Costs and Other Postretirement Benefit Costs [Member] |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | (3,700,000) |
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | (4,861,000) | (4,867,000)
Modified Cost Balancing account ("MCBA") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | (2,500,000) |
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 50,000,000 |
Electric Supply Cost Adjustment Mechanism | BVES |  |
Regulatory matters: |  |
Net regulatory Assets | 2,268,000 | 2,583,000
Low income rate assistance balancing accounts | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | 6,846,000 | 5,763,000
Flowed-through deferred income taxes, net |  |
Regulatory matters: |  |
Net regulatory Assets | 5,600,000 |
Flowed-through deferred income taxes, net | GSWC |  |
Regulatory matters: |  |
Net regulatory Assets | $ 4,348,000 | $ 3,190,000

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