XML 89 R54.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Regulatory Matters - Schedule of Regulatory Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 69,507 | $ (25,454)
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 45,729 | (26,574)
GSWC | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (268) | (8,815)
BVES | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (6,578) | (8,005)
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 52,795 | 0
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 41,545 | 31,803
Asset retirement obligations (Note 1) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 7,099 | 6,411
COVID-19 memorandum accounts | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 1,199 | 3,478
Flowed-through deferred income taxes, net (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 4,300 |
Flowed-through deferred income taxes, net (Note 11) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 3,190 | (1,134)
Low income rate assistance balancing accounts | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 5,763 | 2,526
Pensions and other post-retirement obligations (Note 12) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (4,867) | 738
Other regulatory assets | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 9,462 | 10,289
Other regulatory assets | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 7,697 | 4,338
Excess deferred income taxes (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 74,000 |
Excess deferred income taxes (Note 11) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | (70,189) | (71,870)
Derivative instrument memorandum account (Note 5) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 2,400 |
Derivative instrument memorandum account (Note 5) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 2,360 | (11,847)
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 17,716 | 13,007
Electric supply cost adjustment mechanism | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 2,583 | $ 3,627

X
- Definition Schedule of Regulatory Assets and Liabilities [Line Items] + References No definition available. + Details
Name: | awr_ScheduleOfRegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=awr_BearValleyElectricServiceIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_A20222023GeneralRateCaseMemorandumAccountsUnbilledRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_AssetRetirementObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_COVID19MemorandumAccountCEMAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_FlowThroughTaxesNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_LowIncomeRateAssistanceBalancingAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_PensionCostsAndOtherPostretirementBenefitCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_OtherRegulatoryAssetsNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_GainLossOnDerivativeInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_VegetationManagementAndWildfireMitigationPlansMemosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_ElectricSupplyCostAdjustmentMechanismMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |