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v3.23.2

Regulatory Matters - Narrative (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 29, 2023 | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2023 | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 | Apr. 10, 2023 USD ($)
Regulatory matters: |  |  |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  | $ 73,700,000 |  |  | $ 73,700,000 |  |  |
Net regulatory Assets |  | 56,310,000 |  |  | 56,310,000 | $ (25,454,000) |  |
Regulatory asset amount billed to customers as surcharges |  |  |  |  | $ 0 |  |  |
Cost of capital proceeding |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Adjustment To Return On Equity, If More Than 100 Basis Point Change |  |  |  |  | 0.5 |  |  |
Threshold percentage of Moody's average bond rate used adjusting return on equity and rate of return on rate base, Increase(Decrease) |  |  |  |  | 0.0100 |  |  |
GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | 44,805,000 |  |  | $ 44,805,000 | (26,574,000) |  |
Public Utilities Approved Debt Capital Structure, Percentage Previously Authorized |  |  |  |  | 6.60% |  |  |
Public Utilities, Approved Return on Equity, Percentage Previously Authorized |  |  |  |  | 8.90% |  |  |
Regulatory asset-CEMA |  | 3,500,000 |  |  | $ 3,500,000 |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage | 57.00% |  |  |  |  |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage | 43.00% |  |  |  |  |  |  |
GSWC | Cost of capital proceeding |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Public Utilities, Approved Debt Capital Structure in May 2021 Cost of Capital Application, Percentage |  |  |  |  | 5.10% |  |  |
Public Utilities, Approved Return On Equity in May 2021 Cost of Capital Application, Percentage |  |  |  |  | 8.85% |  |  |
Term for the cost of capital proceeding |  |  |  |  | 3 years |  |  |
Revenue impact due to lower cost of debt |  | 9,300,000 | $ 2,900,000 |  | $ 6,400,000 |  |  |
Triggers for the WCMA adjustment, Impact of 103 Basis Point Increase in Moody's Rate, Percent |  |  |  |  |  |  | 0.01028 |
GSWC | Cost of capital proceeding | Subsequent Event [Member] |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  | 9.36% |  |  |  |
BVES |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Regulatory asset-CEMA |  | 500,000 |  |  | 500,000 |  |  | $ 0
Regulatory Asset -incremental vegetation management costs |  | 10,100,000 |  |  | 10,100,000 |  |  |
Regulatory asset-Wildfire mitigation Plans ( WMP) |  | 5,000,000 |  |  | 5,000,000 |  |  |
Regulatory asset CEMA - Storm |  | 1,300,000 |  |  | $ 1,300,000 |  |  |
2022/2023 general rate case memorandum accounts (unbilled revenue) |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Period to file GSWC's general rate memorandum accounts |  |  |  |  | 90 days |  |  |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | 50,345,000 |  |  | $ 50,345,000 | 0 |  |
Regulatory asset recovery periods |  |  |  |  | 36 months |  |  |
Water revenue adjustment mechanism, net of modified cost balancing account |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Increase (decrease) in other regulatory assets |  |  |  |  | $ 22,200,000 | (9,800,000) |  |
Regulatory asset recovery periods |  |  |  |  | 24 months |  |  |
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | 39,006,000 |  |  | $ 39,006,000 | 31,803,000 |  |
Commercial paper, term |  |  |  |  | 90 days |  |  |
COVID-19 memorandum accounts | GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | 3,543,000 |  |  | $ 3,543,000 | 3,478,000 |  |
Excess deferred income taxes |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  | 74,900,000 |  |  | 74,900,000 |  |  |
Excess deferred income taxes | GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | (70,967,000) |  |  | (70,967,000) | (71,870,000) |  |
Derivative instrument memorandum account (Note 5) |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  | 4,700,000 |  |  | 4,700,000 |  |  |
Derivative instrument memorandum account (Note 5) | BVES |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | (4,657,000) |  |  | (4,657,000) | $ (11,847,000) |  |
Pension Costs and Other Postretirement Benefit Costs [Member] |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  | 2,400,000 |  |  | 2,400,000 |  |  |
Modified Cost Balancing account ("MCBA") | GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | (4,400,000) |  |  | (4,400,000) |  |  |
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |
Net regulatory Assets |  | $ 43,400,000 |  |  | $ 43,400,000 |  |  |

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