XML 68 R55.htm IDEA: XBRL DOCUMENT
v3.25.3

Electric utility segment - Public Utility, Measured under Performance (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) MWh | Dec. 31, 2024 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |
Interconnection requirements study, (penalties) rewards |  | $ 0.0
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Transmission and distribution-caused, maximum penalty | $ 3.6 |
Transmission and distribution-caused, (penalties) rewards |  | (1.0)
Call center performance, maximum penalty or reward | $ 1.4 |
Call center, (penalties) rewards |  | 0.0
Interpolated RPS rate goal, after year three (in dollars per MWh) | MWh | 10 |
Failure to meet RPS targets, penalty rate (in dollars per MWh) | MWh | 20 |
Renewable portfolio standard, (penalties) rewards |  | 1.9
Interconnection approval, maximum reward | $ 3.0 |
Interconnection approval, maximum penalty | 0.9 |
Interconnection approval, (penalties) rewards |  | 2.4
Generated-caused, maximum penalties | 1.0 |
Performance incentive mechanism, (penalties) rewards | $ 0.3 | 6.2
Hawaii Electric Light Company, Inc |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Phase 1 RFP, (penalties) rewards |  | 0.2
Generation caused, (penalties) rewards |  | (0.1)
Collective shared savings mechanism, (penalties) rewards |  | 2.8
Performance incentive mechanism, (penalties) rewards |  | 3.4
Hawaiian Electric, Parent |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Collective shared savings mechanism, retained percentage | 20.00% |
Performance incentive mechanism, (penalties) rewards |  | 2.5
Maui Electric |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Phase 1 RFP, (penalties) rewards | $ 0.3 |
Performance incentive mechanism, (penalties) rewards |  | $ 0.3

X
- Definition Public Utilities, Call Center, Performance Incentive Mechanism, Maximum Penalty Or Reward + References No definition available. + Details
Name: | he_PublicUtilitiesCallCenterPerformanceIncentiveMechanismMaximumPenaltyOrReward
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Call Center, Performance Incentive Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesCallCenterPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Collective Shared Savings Mechanism, Performance Incentive Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesCollectiveSharedSavingsMechanismPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Generation-Caused System Average Interruption, Performance Incentive Mechanism, Maximum Penalty + References No definition available. + Details
Name: | he_PublicUtilitiesGenerationCausedSystemAverageInterruptionPerformanceIncentiveMechanismMaximumPenalty
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Generation-Caused System Average Interruption, Performance Incentive Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesGenerationCausedSystemAverageInterruptionPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Interconnection Approval, Performance Incentive Mechanism, Annual Maximum Penalty + References No definition available. + Details
Name: | he_PublicUtilitiesInterconnectionApprovalPerformanceIncentiveMechanismAnnualMaximumPenalty
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Interconnection Approval Performance Incentive Mechanism, Annual Maximum Reward + References No definition available. + Details
Name: | he_PublicUtilitiesInterconnectionApprovalPerformanceIncentiveMechanismAnnualMaximumReward
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Interconnection Approval, Performance Incentive Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesInterconnectionApprovalPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utility, Interconnection Requirements Study Performance Incentive Mechanism, Accrued Estimated Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesInterconnectionRequirementsStudyPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Performance Incentive, Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Phase 1 Requests For Proposals, Performance Incentive Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesPhase1RequestsForProposalsPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, RPS-A Performance Incentive Mechanism, Failure To Meet RPS Targets, Penalty Rate + References No definition available. + Details
Name: | he_PublicUtilitiesRPSAPerformanceIncentiveMechanismFailureToMeetRPSTargetsPenaltyRate
Namespace Prefix: | he_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, RPS-A Performance Incentive Mechanism, Reward Threshold, Interpolated RPS Rate Goal + References No definition available. + Details
Name: | he_PublicUtilitiesRPSAPerformanceIncentiveMechanismRewardThresholdInterpolatedRPSRateGoal
Namespace Prefix: | he_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Renewable Portfolio Standard, Performance Incentive Mechanism, (Penalties) Rewards + References No definition available. + Details
Name: | he_PublicUtilitiesRenewablePortfolioStandardPerformanceIncentiveMechanismPenaltiesRewards
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Retained Percentage Of Savings + References No definition available. + Details
Name: | he_PublicUtilitiesRetainedPercentageOfSavings
Namespace Prefix: | he_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Transmission And Distribution-Caused System Average Interruption, Performance Incentive Mechanism, Maximum Penalty + References No definition available. + Details
Name: | he_PublicUtilitiesTransmissionAndDistributionCausedSystemAverageInterruptionPerformanceIncentiveMechanismMaximumPenalty
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Transmission And Distribution-Caused System Average Interruption, Performance Incentive Mechanism, (Penalties) Reward + References No definition available. + Details
Name: | he_PublicUtilitiesTransmissionAndDistributionCausedSystemAverageInterruptionPerformanceIncentiveMechanismPenaltiesReward
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_HawaiianElectricCompanyAndSubsidiariesMember
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_HawaiianElectricParentMember
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: |