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Electric utility segment - Public Utility, Measured under Performance (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 USD ($) MWh | Dec. 31, 2024 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |
Interconnection requirements study PIM, estimated rewards | $ 0.0 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Service reliability, maximum penalty | 3.6 |
Service reliability, estimated penalties |  | $ 1.0
Call center performance, pending adjusted maximum penalty | 1.4 |
Call center PIM, accrued estimated 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 |
Accrued estimated rewards |  | 1.9
Potential total annual maximum reward | $ 3.0 |
Total annual maximum penalty | 0.9 |
Interconnection approval PIM, accrued estimated rewards |  | 2.4
Pending adjusted amount | $ 1.0 |
Accrued earned rewards, net of penalties |  | 6.2
Hawaii Electric Light Company, Inc |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Incentives accrued |  | 0.2
Interconnection approval PIM, accrued estimated rewards |  | 2.8
Accrued penalties |  | (0.1)
Accrued earned rewards, net of penalties |  | 3.4
Hawaiian Electric, Parent |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Public utilities retained percentage | 20.00% |
Accrued earned rewards, net of penalties |  | $ 2.5

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- Definition Public Utilities, RPS-A Performance Incentive Mechanism, Failure To Meet RPS Targets, Penalty Rate + References No definition available. + Details
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