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Electric utility segment Regulatory Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Regulatory assets |  |
Regulatory assets | $ 905,264 us-gaap_RegulatoryAssets | $ 575,924 us-gaap_RegulatoryAssets
Regulatory liabilities |  |
Regulatory liabilities | 344,849 us-gaap_RegulatoryLiabilities | 349,299 us-gaap_RegulatoryLiabilities
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Regulatory assets |  |
Regulatory assets | 905,264 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 575,924 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Regulatory liabilities |  |
Regulatory liabilities | 344,849 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 349,299 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Regulatory liabilities | 331,000 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryLiabilityAxis = he_CostOfRemovalInExcessOfSalvageValueMember | 315,164 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryLiabilityAxis = he_CostOfRemovalInExcessOfSalvageValueMember
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | 12,413 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 31,546 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember
Authorized amortization or recovery periods | 5 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | 1,436 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryLiabilityAxis = he_OtherRegulatoryLiabilityMember | 2,589 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryLiabilityAxis = he_OtherRegulatoryLiabilityMember
Authorized amortization or recovery periods | 5 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory assets |  |
Regulatory assets |  |
Regulatory assets | 683,243 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_RetirementBenefitCostAssetMember | 350,821 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_RetirementBenefitCostAssetMember
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes, net |  |
Regulatory assets |  |
Regulatory assets | 86,836 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember | 85,430 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account |  |
Regulatory assets |  |
Regulatory assets | 80,183 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_DecouplingRevenueBalancingAccountMember | 90,386 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_DecouplingRevenueBalancingAccountMember
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Regulatory assets | 15,569 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_UnamortizedExpenseAndPremiumsOnRetiredDebtAndEquityIssuancesMember | 17,342 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_UnamortizedExpenseAndPremiumsOnRetiredDebtAndEquityIssuancesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Vacation earned, but not yet taken |  |
Regulatory assets |  |
Regulatory assets | 10,248 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = us-gaap_RecoverableVacationPayMember | 9,149 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = us-gaap_RecoverableVacationPayMember
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Postretirement benefits other than pensions |  |
Regulatory assets |  |
Regulatory assets | 18 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_PostretirementBenefitsOtherThanPensionsMember | 62 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_PostretirementBenefitsOtherThanPensionsMember
Authorized amortization or recovery periods | 18 years |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets |  |
Regulatory assets |  |
Regulatory assets | 29,167 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_OtherRegulatoryAssetMember | 22,734 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / us-gaap_RegulatoryAssetAxis = he_OtherRegulatoryAssetMember
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 60 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other, regulatory liabilities |  |
Regulatory liabilities |  |
Remaining amortization or recovery periods | 2 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Income taxes, net |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 55 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Decoupling revenue balancing account |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 2 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 30 years |
Remaining amortization or recovery periods | 18 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other, regulatory assets |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 50 years |
Remaining amortization or recovery periods | 46 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other, regulatory liabilities |  |
Regulatory liabilities |  |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Income taxes, net |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Decoupling revenue balancing account |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 19 years |
Remaining amortization or recovery periods | 6 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other, regulatory assets |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Current assets |  |
Regulatory assets |  |
Regulatory assets | 71,421 us-gaap_RegulatoryAssets / us-gaap_BalanceSheetLocationAxis = he_CurrentAssetsMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 69,738 us-gaap_RegulatoryAssets / us-gaap_BalanceSheetLocationAxis = he_CurrentAssetsMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term assets |  |
Regulatory assets |  |
Regulatory assets | 833,843 us-gaap_RegulatoryAssets / us-gaap_BalanceSheetLocationAxis = he_LongTermAssetsMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 506,186 us-gaap_RegulatoryAssets / us-gaap_BalanceSheetLocationAxis = he_LongTermAssetsMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Current liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | 632 us-gaap_RegulatoryLiabilities / us-gaap_BalanceSheetLocationAxis = he_CurrentLiabilitiesMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,916 us-gaap_RegulatoryLiabilities / us-gaap_BalanceSheetLocationAxis = he_CurrentLiabilitiesMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | $ 344,217 us-gaap_RegulatoryLiabilities / us-gaap_BalanceSheetLocationAxis = he_LongtermLiabilitiesMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 347,383 us-gaap_RegulatoryLiabilities / us-gaap_BalanceSheetLocationAxis = he_LongtermLiabilitiesMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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