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v2.4.1.9

Income taxes Deferred Tax Assets and Liabilities Due to Book/Tax Differences (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets |  |
Net operating loss | $ 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other | 58,352 us-gaap_DeferredTaxAssetsOther | 57,239 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 58,352 us-gaap_DeferredTaxAssetsGross | 57,239 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities |  |
Property, plant and equipment | 448,723 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 378,280 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Repairs deduction | 86,408 he_DeferredTaxLiabilitiesChangeInAccountingMethodRelatedToRepairs | 75,127 he_DeferredTaxLiabilitiesChangeInAccountingMethodRelatedToRepairs
Regulatory assets, excluding amounts attributable to property, plant and equipment | 33,795 us-gaap_DeferredTaxLiabilitiesRegulatoryAssets | 33,251 us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Deferred RAM and RBA revenues | 32,889 he_DeferredTaxLiabilitiesDeferredRateAdjustmentMechanismandRBARevenues | 0 he_DeferredTaxLiabilitiesDeferredRateAdjustmentMechanismandRBARevenues
Retirement benefits | 25,336 he_DeferredTaxLiabilitiesDeferredExpensePostretirementBenefits | 29,280 he_DeferredTaxLiabilitiesDeferredExpensePostretirementBenefits
Other | 62,935 us-gaap_DeferredTaxLiabilitiesOther | 70,561 us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | 690,086 us-gaap_DeferredIncomeTaxLiabilities | 586,499 us-gaap_DeferredIncomeTaxLiabilities
Deferred income taxes (credit) | 631,734 us-gaap_DeferredTaxLiabilitiesNoncurrent | 529,260 us-gaap_DeferredTaxLiabilitiesNoncurrent
Total deferred tax liabilities | 631,734 us-gaap_DeferredTaxLiabilities | 529,260 us-gaap_DeferredTaxLiabilities
Prepayments and other (Current assets-debit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember | 0 us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
Other (Current liabilities-credit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember | 0 us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Deferred tax assets |  |
Net operating loss | 51,936 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 19,848 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other | 17,663 us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 17,295 us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Total deferred tax assets | 69,599 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 37,143 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred tax liabilities |  |
Property, plant and equipment | 446,259 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 375,771 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Repairs deduction | 86,408 he_DeferredTaxLiabilitiesChangeInAccountingMethodRelatedToRepairs / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 75,127 he_DeferredTaxLiabilitiesChangeInAccountingMethodRelatedToRepairs / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Regulatory assets, excluding amounts attributable to property, plant and equipment | 33,795 us-gaap_DeferredTaxLiabilitiesRegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 33,251 us-gaap_DeferredTaxLiabilitiesRegulatoryAssets / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred RAM and RBA revenues | 32,889 he_DeferredTaxLiabilitiesDeferredRateAdjustmentMechanismandRBARevenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Retirement benefits | 28,758 he_DeferredTaxLiabilitiesDeferredExpensePostretirementBenefits / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 23,851 he_DeferredTaxLiabilitiesDeferredExpensePostretirementBenefits / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other | 14,929 us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 15,602 us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Total deferred tax liabilities | 643,038 us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 523,602 us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Deferred income taxes (credit) | 602,872 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 507,161 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Total deferred tax liabilities | 573,439 us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 486,459 us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Prepayments and other (Current assets-debit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | (32,915)us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (20,702)us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Other (Current liabilities-credit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | $ 3,482 us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 0 us-gaap_DeferredTaxLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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