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Electric utility segment Liquefied Natural Gas (Details) | 1 Months Ended
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Aug. 31, 2014 t
Electric utility subsidiary [Abstract] |
Term Of Agreement | 15 years
Liquefaction capacity annual purchases, first tranche | 800,000 he_PurchaseAgreementAnnualCapacityPurchasesTrancheOne
Purchase agreement, period of first tranche | 5 years
Liquefaction capacity annual purchases, second tranche | 700,000 he_PurchaseAgreementAnnualCapacityPurchasesTrancheTwo
Purchase agreement, period of second tranche | 5 years
Liquefaction capacity annual purchases, third tranche | 600,000 he_PurchaseAgreementAnnualCapacityPurchasesTrancheThree
Purchase agreement, period of third tranche | 5 years

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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 Long-term Purchase Commitment, Period, Tranche Three + References No definition available. + Details
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- Definition Long-term Purchase Commitment, Period, Tranche Two + References No definition available. + Details
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- Definition Purchase Agreement, Annual Capacity Purchases, Tranche One + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Purchase Agreement, Annual Capacity Purchases, Tranche Three + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Purchase Agreement, Annual Capacity Purchases, Tranche Two + References No definition available. + Details
Name: | he_PurchaseAgreementAnnualCapacityPurchasesTrancheTwo
Namespace Prefix: | he_
Data Type: | num:massItemType
Balance Type: | na
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- Definition Term Of Agreement + References No definition available. + Details
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Period Type: | duration