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Electric utility segment - Annual Decoupling Filings Summary (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Mar. 28, 2024 | Mar. 31, 2024
Regulatory Projects and Legal Obligations [Line Items] |  |
Recovery of COVID-19 related costs | $ 3.2 |
Return of ERP benefit liability | (3.2) |
Net 2024 ARA revenues | 0.0 |
Incremental RAM revenues and ARA revenues |  | $ 0.0
Incremental PIMs (net) |  | (2.6)
Incremental MPIR/EPRM revenue adjustment |  | 4.9
Incremental Pilot Process cost recovery |  | 2.7
Net incremental amount to be collected under the RBA rate tariffs |  | 5.0
Hawaiian Electric, Parent |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Recovery of COVID-19 related costs | 2.2 |
Return of ERP benefit liability | 0.0 |
Net 2024 ARA revenues | 2.2 |
Incremental RAM revenues and ARA revenues |  | 2.2
Incremental PIMs (net) |  | (1.3)
Incremental MPIR/EPRM revenue adjustment |  | 3.0
Incremental Pilot Process cost recovery |  | 1.9
Net incremental amount to be collected under the RBA rate tariffs |  | 5.8
Hawaii Electric Light |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Recovery of COVID-19 related costs | 0.5 |
Return of ERP benefit liability | (1.3) |
Net 2024 ARA revenues | (0.8) |
Incremental RAM revenues and ARA revenues |  | (0.8)
Incremental PIMs (net) |  | (1.1)
Incremental MPIR/EPRM revenue adjustment |  | 0.7
Incremental Pilot Process cost recovery |  | 0.3
Net incremental amount to be collected under the RBA rate tariffs |  | (0.9)
Maui Electric |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Recovery of COVID-19 related costs | 0.5 |
Return of ERP benefit liability | (1.9) |
Net 2024 ARA revenues | $ (1.4) |
Incremental RAM revenues and ARA revenues |  | (1.4)
Incremental PIMs (net) |  | (0.2)
Incremental MPIR/EPRM revenue adjustment |  | 1.2
Incremental Pilot Process cost recovery |  | 0.5
Net incremental amount to be collected under the RBA rate tariffs |  | $ 0.1

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