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Electric utility segment 2014 Agreement (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2014 order | Dec. 31, 2012 | Jan. 28, 2013
Regulatory projects and legal obligations |  |  |
Remaining recoverable project costs included in rate base, in accordance with the settlement agreement |  | $ 52 he_RemainingRecoverableProjectCostsIncludedInRateBaseAsPerSettlementAgreement |
Number of orders from regulatory agency | 4 he_PublicUtilitiesOrdersfromRegulatoryAgencyNumber |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Regulatory projects and legal obligations |  |  |
Period to file required plan | 120 days |  |
Reliability standards, regulatory filing period | 120 days |  |
Period to file implementation plan | 60 days |  |
Period for full implementation of plan | 180 days |  |
Period to file action plan | 30 days |  |
Period to file implementation proposal | 120 days |  |
Regulatory response filing period | 90 days |  |
Hawaiian Electric Company, Inc. and Subsidiaries | CIS project |  |  |
Regulatory projects and legal obligations |  |  |
Project costs to be written off, subject to approval by PUC |  |  | 40 he_CostOfUtilitiesWriteOffOfProjectCostsSubjectToPUCApproval / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / he_RegulatoryProjectsAndLegalObligationsAxis = he_CustomerInformationSystemProjectMember
After-tax charge to net income due to write-off of project costs |  | 24.0 he_ImpactOfWriteOffOfProjectCostsOnNetIncomeLossNetOfTax / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember / he_RegulatoryProjectsAndLegalObligationsAxis = he_CustomerInformationSystemProjectMember |
HECO | CIS project |  |  |
Regulatory projects and legal obligations |  |  |
After-tax charge to net income due to write-off of project costs |  | 17.1 he_ImpactOfWriteOffOfProjectCostsOnNetIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / he_RegulatoryProjectsAndLegalObligationsAxis = he_CustomerInformationSystemProjectMember |
HELCO | CIS project |  |  |
Regulatory projects and legal obligations |  |  |
After-tax charge to net income due to write-off of project costs |  | 3.4 he_ImpactOfWriteOffOfProjectCostsOnNetIncomeLossNetOfTax / dei_LegalEntityAxis = he_SubsidiariesTwoMember / he_RegulatoryProjectsAndLegalObligationsAxis = he_CustomerInformationSystemProjectMember |
MECO |  |  |
Regulatory projects and legal obligations |  |  |
Program and system information protocol, filing period | 120 days |  |
MECO | CIS project |  |  |
Regulatory projects and legal obligations |  |  |
After-tax charge to net income due to write-off of project costs |  | $ 3.2 he_ImpactOfWriteOffOfProjectCostsOnNetIncomeLossNetOfTax / dei_LegalEntityAxis = he_SubsidiariesThreeMember / he_RegulatoryProjectsAndLegalObligationsAxis = he_CustomerInformationSystemProjectMember |

X
- Definition Represents the amount of project costs to be written off, subject to an approval by Utilities Commission of the State of Hawaii. + References No definition available. + Details
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- Definition Public Utilities Orders from Regulatory Agency Number + References No definition available. + Details
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- Definition Public Utilities, Regulatory Filing Period, Implementation Period + References No definition available. + Details
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- Definition Public Utilities, Regulatory Proposal Filing Period + References No definition available. + Details
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