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Electric utility segment - Annual Decoupling Filings Summary (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 31, 2023 | Sep. 30, 2023
Regulatory Projects and Legal Obligations [Line Items] |  |
Incremental RAM revenues and ARA revenues |  | $ 24.9
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes) |  | 3.4
Incremental Performance Incentive Mechanisms (net) |  | 0.1
Net incremental amount to be collected under the RBA rate tariffs |  | 28.4
Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2024 ARA revenues | $ 24.7 |
Management Audit savings commitment | (6.6) |
Enterprise Resource Planning system benefits savings | (3.2) |
COVID-19 related cost recovery | 3.4 |
Net 2024 ARA revenues | 18.3 |
Hawaiian Electric, Parent |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Incremental RAM revenues and ARA revenues |  | 19.2
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes) |  | 3.6
Incremental Performance Incentive Mechanisms (net) |  | 0.1
Net incremental amount to be collected under the RBA rate tariffs |  | 22.9
Hawaiian Electric, Parent | Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2024 ARA revenues | 16.6 |
Management Audit savings commitment | (4.6) |
Enterprise Resource Planning system benefits savings | 0.0 |
COVID-19 related cost recovery | 2.6 |
Net 2024 ARA revenues | 14.6 |
Hawaii Electric Light |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Incremental RAM revenues and ARA revenues |  | 3.0
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes) |  | (0.3)
Incremental Performance Incentive Mechanisms (net) |  | 0.0
Net incremental amount to be collected under the RBA rate tariffs |  | 2.7
Hawaii Electric Light | Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2024 ARA revenues | 4.1 |
Management Audit savings commitment | (1.0) |
Enterprise Resource Planning system benefits savings | (1.3) |
COVID-19 related cost recovery | 0.2 |
Net 2024 ARA revenues | 2.0 |
Maui Electric |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Incremental RAM revenues and ARA revenues |  | 2.7
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes) |  | 0.1
Incremental Performance Incentive Mechanisms (net) |  | 0.0
Net incremental amount to be collected under the RBA rate tariffs |  | $ 2.8
Maui Electric | Subsequent Event |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2024 ARA revenues | 4.0 |
Management Audit savings commitment | (1.0) |
Enterprise Resource Planning system benefits savings | (1.9) |
COVID-19 related cost recovery | 0.6 |
Net 2024 ARA revenues | $ 1.7 |

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