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Electric utility subsidiary - Consolidating statement of income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Operating expenses |  |
Purchased power | $ 136,000 us-gaap_UtilitiesOperatingExpensePurchasedPower | $ 165,000 us-gaap_UtilitiesOperatingExpensePurchasedPower
Total expenses | 568,356 us-gaap_CostsAndExpenses | 694,535 us-gaap_CostsAndExpenses
Operating income | 69,506 us-gaap_OperatingIncomeLoss | 89,214 us-gaap_OperatingIncomeLoss
Other income (loss) |  |
Allowance for equity funds used during construction | 1,413 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 1,609 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Interest and other charges |  |
Allowance for borrowed funds used during construction | 499 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest | 614 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
Income taxes | 19,979 us-gaap_IncomeTaxExpenseBenefit | 25,721 us-gaap_IncomeTaxExpenseBenefit
Net income | 32,339 us-gaap_ProfitLoss | 46,260 us-gaap_ProfitLoss
Preferred stock dividends of subsidiaries | 473 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable | 473 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable
Net income for common stock | 31,866 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 45,787 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Hawaiian Electric Company |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 399,741 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 512,455 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Operating expenses |  |
Fuel oil | 118,403 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 203,547 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Purchased power | 103,250 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 123,969 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other operation and maintenance | 70,084 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 58,515 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Depreciation | 29,389 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 27,301 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Taxes, other than income taxes | 38,201 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 48,184 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total expenses | 359,327 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 461,516 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Operating income | 40,414 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 50,939 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other income (loss) |  |
Allowance for equity funds used during construction | 1,123 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,472 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Equity in earnings of subsidiaries | 7,692 he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 8,917 he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Interest expense and other charges, net | (11,238)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (10,487)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Interest and other charges |  |
Allowance for borrowed funds used during construction | 388 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 559 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income before income taxes | 38,379 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 51,400 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income taxes | 11,235 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 15,710 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income | 27,144 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35,690 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income attributable to Hawaiian Electric | 27,144 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35,690 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Preferred stock dividends of Hawaiian Electric | 270 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 270 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income for common stock | 26,874 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35,420 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
HELCO |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 88,055 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 104,931 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Operating expenses |  |
Fuel oil | 23,385 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 31,500 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Purchased power | 21,893 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 29,491 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Other operation and maintenance | 16,399 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 14,047 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Depreciation | 9,313 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 8,975 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Taxes, other than income taxes | 8,384 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 9,763 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Total expenses | 79,374 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 93,776 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Operating income | 8,681 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 11,155 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Other income (loss) |  |
Allowance for equity funds used during construction | 145 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 65 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Interest expense and other charges, net | (2,680)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | (2,748)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Interest and other charges |  |
Allowance for borrowed funds used during construction | 53 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 25 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Income before income taxes | 6,199 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 8,497 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Income taxes | 2,277 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 3,202 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Net income | 3,922 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 5,295 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Preferred stock dividends of subsidiaries | 134 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 134 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Net income attributable to Hawaiian Electric | 3,788 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 5,161 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Net income for common stock | 3,788 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 5,161 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Maui Electric |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 85,674 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 102,693 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Operating expenses |  |
Fuel oil | 35,018 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 51,253 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Purchased power | 10,864 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 11,456 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Other operation and maintenance | 17,519 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 16,044 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Depreciation | 5,541 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 5,327 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Taxes, other than income taxes | 8,163 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 10,024 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Total expenses | 77,105 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 94,104 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Operating income | 8,569 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 8,589 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Other income (loss) |  |
Allowance for equity funds used during construction | 145 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 72 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Interest expense and other charges, net | (2,435)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | (2,505)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Interest and other charges |  |
Allowance for borrowed funds used during construction | 58 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 30 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Income before income taxes | 6,337 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 6,186 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Income taxes | 2,338 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 2,335 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Net income | 3,999 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 3,851 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Preferred stock dividends of subsidiaries | 95 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 95 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Net income attributable to Hawaiian Electric | 3,904 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 3,756 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Net income for common stock | 3,904 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 3,756 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Other subsidiaries |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 0 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Operating expenses |  |
Other operation and maintenance | 0 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Total expenses | 0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Operating income | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Interest and other charges |  |
Income before income taxes | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Income taxes | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Net income | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Net income attributable to Hawaiian Electric | 0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Net income for common stock | 0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Consolidating adjustments |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | (28)us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (17)us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Operating expenses |  |
Operating income | (28)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (17)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Other income (loss) |  |
Equity in earnings of subsidiaries | (7,692)he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (8,917)he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Interest expense and other charges, net | 28 he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 17 he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Interest and other charges |  |
Income before income taxes | (7,692)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (8,917)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Income taxes | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Net income | (7,692)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (8,917)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Net income attributable to Hawaiian Electric | (7,692)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (8,917)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Net income for common stock | (7,692)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (8,917)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
HECO Consolidated |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 573,442 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 720,062 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Operating expenses |  |
Fuel oil | 176,806 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 286,300 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Purchased power | 136,007 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 164,916 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other operation and maintenance | 104,002 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 88,606 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Depreciation | 44,243 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 41,603 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Taxes, other than income taxes | 54,748 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 67,971 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Total expenses | 515,806 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 649,396 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Operating income | 57,636 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 70,666 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other income (loss) |  |
Allowance for equity funds used during construction | 1,413 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,609 us-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
Interest and other charges |  |
Allowance for borrowed funds used during construction | 499 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 614 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income before income taxes | 43,223 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 57,166 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Income taxes | 15,850 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 21,247 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income | 27,373 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 35,919 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Preferred stock dividends of subsidiaries | 229 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 229 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income attributable to Hawaiian Electric | 27,144 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 35,690 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Preferred stock dividends of Hawaiian Electric | 270 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 270 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income for common stock | $ 26,874 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 35,420 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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- Definition Represents the amount of equity in earnings of subsidiaries. + References No definition available. + Details
Name: | he_EquityInEarningsOfSubsidiaries
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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