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v3.23.1

Regulatory Matters - Narrative (Details) | 3 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 | Mar. 31, 2023 USD ($) | Apr. 10, 2023 USD ($)
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 77,600,000 |  |  |  | $ 77,600,000 |
Net Regulatory assets | 17,626,000 |  | $ (25,454,000) |  | 17,626,000 |
Regulatory asset amount billed to customers as surcharges | 0 |  |  |  |  |
GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | $ 9,249,000 |  | (26,574,000) |  | $ 9,249,000 |
Number of unresolved issues for 2022-2024 water General Rate Case | 3 |  |  |  | 3 |
Number of customer service areas for the consolidation | 2 |  |  |  | 2 |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  | 8.90% |
Regulatory asset-CEMA | $ 3,500,000 |  |  |  | $ 3,500,000 |
GSWC | Cost of capital proceeding |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Revenue impact due to lower cost of debt | 1,800,000 | $ 1,400,000 | 1,100,000 |  |  |
BVES |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory Asset -incremental vegetation management costs | 9,300,000 |  |  |  | 9,300,000 |
Regulatory asset-CEMA | 500,000 |  |  |  | 500,000 |
Regulatory asset-Wildfire mitigation Plans ( WMP) | 4,800,000 |  |  |  | 4,800,000 |
Regulatory asset CEMA - Storm | 810,000 |  |  |  | 810,000 |
BVES | Subsequent Event [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory asset-CEMA |  |  |  |  |  | $ 0
Excess deferred income taxes |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | 75,200,000 |  |  |  | 75,200,000 |
Excess deferred income taxes | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | (71,418,000) |  | (71,870,000) |  | (71,418,000) |
Flowed-through income taxes | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | 447,000 |  | (1,134,000) |  | 447,000 |
Derivative instrument memorandum account (Note 5) |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | 6,700,000 |  |  |  | 6,700,000 |
Derivative instrument memorandum account (Note 5) | BVES |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | (6,669,000) |  | (11,847,000) |  | (6,669,000) |
Water revenue adjustment mechanism, net of the modified cost balancing account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Increase (decrease) in other regulatory assets | $ 9,500,000 |  | (9,800,000) |  |  |
Regulatory asset recovery periods | 24 months |  |  |  |  |
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | $ 29,069,000 |  | 31,803,000 |  | 29,069,000 |
Commercial paper, term | 90 days |  |  |  |  |
Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 2,300,000 |  |  |  | 2,300,000 |
Water Revenue Adjustment Mechanism |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | 28,900,000 |  |  |  | 28,900,000 |
Modified Cost Balancing Account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | 189,000 |  |  |  | 189,000 |
Cost of capital proceeding |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | 9,300,000 |  |  |  | 9,300,000 |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Net Regulatory assets | $ 38,419,000 |  | $ 0 |  | $ 38,419,000 |
Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Threshold percentage of Moody's average bond rate used adjusting return on equity and rate of return on rate base, Increase(Decrease) | 0.0100 |  |  |  |  |
Adjust to return on equity | 0.5 |  |  |  |  |
Cost of Capital, Proceeding for Water Regions [Member] | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 8.85% |  |  |  |  |
Term for the cost of capital proceeding | 3 years |  |  |  |  |
Triggers for the WCMA adjustment, Impact of 103 Basis Point Increase in Moody's Rate, Percent |  |  |  | 0.0103 |  |

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