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Electric utility segment - Annual Decoupling Filings Summary (Details) - Subsequent Event - USD ($) $ in Millions |  | 7 Months Ended
--- | --- | ---
Oct. 31, 2025 | Oct. 31, 2025
Regulatory Projects and Legal Obligations [Line Items] |  |
2026 ARA revenue | $ 30.3 |
Management Audit savings commitment | (6.6) |
Net 2026 ARA revenues | 23.7 |
2026 ARA revenues |  | $ 30.3
Annual change in accrued RBA balance through September 30, 2025 (and associated revenue taxes) |  | (30.6)
Incremental Performance Incentive Mechanisms (net) |  | 0.2
Net incremental amount to be collected under the RBA rate tariffs |  | (0.1)
Hawaiian Electric, Parent |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2026 ARA revenue | 20.4 |
Management Audit savings commitment | (4.6) |
Net 2026 ARA revenues | 15.8 |
2026 ARA revenues |  | 20.4
Annual change in accrued RBA balance through September 30, 2025 (and associated revenue taxes) |  | (18.6)
Incremental Performance Incentive Mechanisms (net) |  | 0.0
Net incremental amount to be collected under the RBA rate tariffs |  | 1.8
Hawaii Electric Light |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2026 ARA revenue | 5.0 |
Management Audit savings commitment | (1.0) |
Net 2026 ARA revenues | 4.0 |
2026 ARA revenues |  | 5.0
Annual change in accrued RBA balance through September 30, 2025 (and associated revenue taxes) |  | (1.3)
Incremental Performance Incentive Mechanisms (net) |  | (0.1)
Net incremental amount to be collected under the RBA rate tariffs |  | 3.6
Maui Electric |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
2026 ARA revenue | 4.9 |
Management Audit savings commitment | (1.0) |
Net 2026 ARA revenues | $ 3.9 |
2026 ARA revenues |  | 4.9
Annual change in accrued RBA balance through September 30, 2025 (and associated revenue taxes) |  | (10.7)
Incremental Performance Incentive Mechanisms (net) |  | 0.3
Net incremental amount to be collected under the RBA rate tariffs |  | $ (5.5)

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