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Electric utility segment - Annual Decoupling Filings Summary (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 28, 2024 | Sep. 30, 2024
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues |  | $ 22.9
Annual change in accrued RBA balance through September 30, 2024 (and associated revenue taxes) |  | (1.9)
Incremental PIMs (net) |  | 0.0
Net incremental amount to be collected under the RBA rate tariffs |  | 21.0
Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues | $ 22.9 |
Management Audit savings commitment | (6.6) |
Net 2025 ARA revenues | 16.3 |
Hawaiian Electric, Parent |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues |  | 15.4
Annual change in accrued RBA balance through September 30, 2024 (and associated revenue taxes) |  | (7.0)
Incremental PIMs (net) |  | (0.1)
Net incremental amount to be collected under the RBA rate tariffs |  | 8.3
Hawaiian Electric, Parent | Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues | 15.4 |
Management Audit savings commitment | (4.6) |
Net 2025 ARA revenues | 10.8 |
Hawaii Electric Light |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues |  | 3.8
Annual change in accrued RBA balance through September 30, 2024 (and associated revenue taxes) |  | (1.3)
Incremental PIMs (net) |  | 0.1
Net incremental amount to be collected under the RBA rate tariffs |  | 2.6
Hawaii Electric Light | Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues | 3.8 |
Management Audit savings commitment | (1.0) |
Net 2025 ARA revenues | 2.8 |
Maui Electric |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues |  | 3.7
Annual change in accrued RBA balance through September 30, 2024 (and associated revenue taxes) |  | 6.4
Incremental PIMs (net) |  | 0.0
Net incremental amount to be collected under the RBA rate tariffs |  | $ 10.1
Maui Electric | Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2025 ARA revenues | 3.7 |
Management Audit savings commitment | (1.0) |
Net 2025 ARA revenues | $ 2.7 |

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