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Consolidated Statements of Income (unaudited) - HECO (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Total revenues	$ 637,862us-gaap_Revenues	$ 783,749us-gaap_Revenues
Operating expenses
Purchased power	136,000us-gaap_UtilitiesOperatingExpensePurchasedPower	165,000us-gaap_UtilitiesOperatingExpensePurchasedPower
Total expenses	568,356us-gaap_CostsAndExpenses	694,535us-gaap_CostsAndExpenses
Operating income	69,506us-gaap_OperatingIncomeLoss	89,214us-gaap_OperatingIncomeLoss
Allowance for equity funds used during construction	1,413us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	1,609us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Allowance for borrowed funds used during construction	499us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	614us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
Income taxes	19,979us-gaap_IncomeTaxExpenseBenefit	25,721us-gaap_IncomeTaxExpenseBenefit
Net income	32,339us-gaap_ProfitLoss	46,260us-gaap_ProfitLoss
Preferred stock dividends of subsidiaries	473us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	473us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable
Net income for common stock	31,866us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	45,787us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Hawaiian Electric Company, Inc. and Subsidiaries
Total revenues	573,442us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	720,062us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Operating expenses
Fuel oil	176,806us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	286,300us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Purchased power	136,007us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	164,916us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other operation and maintenance	104,002us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	88,606us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Depreciation	44,243us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	41,603us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Taxes, other than income taxes	54,748he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	67,971he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Total expenses	515,806us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	649,396us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Operating income	57,636us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	70,666us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Allowance for equity funds used during construction	1,413us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	1,609us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Interest expense and other charges, net	(16,325)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	(15,723)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Allowance for borrowed funds used during construction	499us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	614us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income before income taxes	43,223us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	57,166us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income taxes	15,850us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	21,247us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income	27,373us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	35,919us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Preferred stock dividends of subsidiaries	229us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	229us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income attributable to Hawaiian Electric	27,144us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	35,690us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Preferred stock dividends of Hawaiian Electric	270us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	270us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income for common stock	$ 26,874us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	$ 35,420us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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