XML 53 R37.htm IDEA: XBRL DOCUMENT
v3.21.1

Electric utility segment - Annual decoupling filings summary (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |
2021 Annual incremental RAM adjusted revenues and ARA revenues | $ (21.7)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) | 25.0
Incremental Performance Incentive Mechanisms (net) | 0.7
Incremental MPIR/EPRM Revenue Adjustment | 12.8
Incremental Affiliate Transaction Refund/PUC Ordered Adjustment | 2.0
Net annual incremental amount to be collected under the tariffs | 18.7
Hawaiian Electric (parent only) |
Regulatory Projects and Legal Obligations [Line Items] |
2021 Annual incremental RAM adjusted revenues and ARA revenues | (13.8)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) | 10.4
Incremental Performance Incentive Mechanisms (net) | 0.0
Incremental MPIR/EPRM Revenue Adjustment | 12.6
Incremental Affiliate Transaction Refund/PUC Ordered Adjustment | 0.0
Net annual incremental amount to be collected under the tariffs | 9.1
Hawaii Electric Light |
Regulatory Projects and Legal Obligations [Line Items] |
2021 Annual incremental RAM adjusted revenues and ARA revenues | (2.0)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) | 5.7
Incremental Performance Incentive Mechanisms (net) | 0.2
Incremental MPIR/EPRM Revenue Adjustment | 0.1
Net annual incremental amount to be collected under the tariffs | 4.0
Maui Electric |
Regulatory Projects and Legal Obligations [Line Items] |
2021 Annual incremental RAM adjusted revenues and ARA revenues | (5.9)
Annual change in accrued RBA balance as of December 31, 2020 (and associated revenue taxes) | 8.9
Incremental Performance Incentive Mechanisms (net) | 0.5
Incremental MPIR/EPRM Revenue Adjustment | 0.1
Incremental Affiliate Transaction Refund/PUC Ordered Adjustment | 2.0
Net annual incremental amount to be collected under the tariffs | $ 5.6

X
- Definition Public Utilities, Decoupling Filing, Performance Incentive Mechanism, Net + References No definition available. + Details
Name: | he_PublicUtilitiesDecouplingFilingPerformanceIncentiveMechanismNet
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Incremental Affiliate Transaction Refund And Public Utilities Commission Ordered Adjustment + References No definition available. + Details
Name: | he_PublicUtilitiesIncrementalAffiliateTransactionRefundAndPublicUtilitiesCommissionOrderedAdjustment
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Incremental Major Project Interim Recovery And Exceptional Project Recovery Mechanism Adjustment + References No definition available. + Details
Name: | he_PublicUtilitiesIncrementalMajorProjectInterimRecoveryAndExceptionalProjectRecoveryMechanismAdjustment
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utility, Annual Incremental Rate Adjustment Mechanism Adjusted Revenue + References No definition available. + Details
Name: | he_PublicUtilityAnnualIncrementalRateAdjustmentMechanismAdjustedRevenue
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utility, Increase (Decrease) In Accrued Earnings Sharing Credits To Be Refunded + References No definition available. + Details
Name: | he_PublicUtilityIncreaseDecreaseInAccruedEarningsSharingCreditsToBeRefunded
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utility, Net Receivable Under Tariff + References No definition available. + Details
Name: | he_PublicUtilityNetReceivableUnderTariff
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | he_RegulatoryProjectsAndLegalObligationsLineItems
Namespace Prefix: | he_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiianElectricParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiiElectricLightCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_MauiElectricCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |