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Electric utility subsidiary - Liquefied natural gas (Details) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Aug. 08, 2014 | Mar. 31, 2015 | Aug. 31, 2014 t
Electric utility subsidiary [Abstract] |  |  |
Term of agreement | 15 years |  |
Liquefaction capacity purchases, year one |  |  | 800,000 he_PurchaseAgreementAnnualCapacityPurchasesYearOne
Purchase agreement, period of first tranche |  | 5 years |
Purchase agreement, period of second tranche |  | 5 years |
Purchase agreement, period of third tranche |  | 5 years |
Liquefaction capacity purchases, year two |  |  | 800,000 he_PurchaseAgreementAnnualCapacityPurchasesYearTwo
Liquefaction capacity purchases, year three |  |  | 800,000 he_PurchaseAgreementAnnualCapacityPurchasesYearThree
Liquefaction capacity purchases, year four |  |  | 800,000 he_PurchaseAgreementAnnualCapacityPurchasesYearFour
Liquefaction capacity purchases, year five |  |  | 800,000 he_PurchaseAgreementAnnualCapacityPurchasesYearFive
Liquefaction capacity purchases, year six |  |  | 700,000 he_PurchaseAgreementAnnualCapacityPurchasesYearSix
Liquefaction capacity purchases, year seven |  |  | 700,000 he_PurchaseAgreementAnnualCapacityPurchasesYearSeven
Liquefaction capacity purchases, year eight |  |  | 700,000 he_PurchaseAgreementAnnualCapacityPurchasesYearEight
Liquefaction capacity purchases, year nine |  |  | 700,000 he_PurchaseAgreementAnnualCapacityPurchasesYearNine
Liquefaction capacity purchases, year ten |  |  | 700,000 he_PurchaseAgreementAnnualCapacityPurchasesYearTen
Liquefaction capacity purchases, year eleven |  |  | 600,000 he_PurchaseAgreementAnnualCapacityPurchasesYearEleven
Liquefaction capacity purchases, year twelve |  |  | 600,000 he_PurchaseAgreementAnnualCapacityPurchasesYearTwelve
Liquefaction capacity purchases, year thirteen |  |  | 600,000 he_PurchaseAgreementAnnualCapacityPurchasesYearThirteen
Liquefaction capacity purchases, year fourteen |  |  | 600,000 he_PurchaseAgreementAnnualCapacityPurchasesYearFourteen
Liquefaction capacity purchases, year fifteen |  |  | 600,000 he_PurchaseAgreementAnnualCapacityPurchasesYearFifteen

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- Details
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- Definition Long-term Purchase Commitment, Period, Tranche One + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Eight + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Eleven + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Fifteen + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Five + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Four + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Fourteen + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Nine + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year One + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Seven + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Six + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Ten + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Thirteen + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Twelve + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Year Two + References No definition available. + Details
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- Definition Term Of Agreement + References No definition available. + Details
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