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Maui windstorm and wildfires - Narrative (Details) $ in Thousands |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 9 Months Ended | 14 Months Ended |  |  |  |
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Nov. 21, 2025 | Nov. 05, 2025 USD ($) | Oct. 31, 2025 plaintiff claim | Nov. 01, 2024 USD ($) lawyer fund claim installment | May 04, 2024 USD ($) | Feb. 08, 2024 claim | Jun. 08, 2024 claim | Sep. 30, 2025 USD ($) condition | Sep. 30, 2024 USD ($) | Nov. 06, 2024 claim | Oct. 15, 2025 claim | Oct. 07, 2025 claim | Dec. 31, 2024 USD ($) | Nov. 08, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 251,205 |  |  |  |  | $ 227,424 |
Property insurance policy limit |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
Retention for property damages |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Property insurance coverage |  |  |  |  |  |  |  | 490,400 |  |  |  |  |  |
Settlement accrual, current liability |  |  |  |  |  |  |  | 526,500 |  |  |  |  | 478,750 |
Settlement accrual, non-current liabilities |  |  |  |  |  |  |  | 1,436,250 |  |  |  |  | 1,436,250 |
Excess liability insurance |  |  |  |  |  |  |  | 11,000 |  |  |  |  |  |
Miscellaneous professional liability |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Directors and officers liability insurance |  |  |  |  |  |  |  | 72,000 |  |  |  |  |  |
Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  |  |  | 96,000 |  |  |  |  |  |
Indemnification Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount awarded |  |  |  |  | $ 18,400 |  |  |  |  |  |  |  |  |
Maui Wildfire Negligence | Wildfire tort-related claims | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess liability insurance |  |  |  |  |  |  |  | 165,000 |  |  |  |  |  |
Miscellaneous professional liability |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |
Excess liability insurance, retention amount |  |  |  |  |  |  |  | 300 |  |  |  |  |  |
Miscellaneous liability insurance, retention amount |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Directors and officers liability insurance |  |  |  |  |  |  |  | 145,000 |  |  |  |  |  |
Directors and officers liability insurance, retention |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of settlement agreements | claim |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of lawyers representing individual plaintiffs | lawyer |  |  |  | 30 |  |  |  |  |  |  |  |  |  |
Litigation settlement, fee expense accrued |  |  |  |  |  |  |  | 3,500 |  |  |  |  |  |
Securities Action | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount awarded |  | $ 47,800 |  |  |  |  |  |  |  |  |  |  |  |
Shareholder Derivative Actions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount awarded |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of attorney's fees requested of the proceeds |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Expenses not to exceed amount |  | $ 475 |  |  |  |  |  |  |  |  |  |  |  |
Shareholder Derivative Actions, District Of Hawaii |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  |  |  | 2 |  |  | 2 |  |  |  |
Shareholder Derivative Actions, Northern District Of California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
County Of Maui | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Spectrum Oceanic LLC | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Subrogation Insurers | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases filed by subrogation insurers | plaintiff |  |  | 200 |  |  |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  | 8,600 | $ 0 |  |  |  |  |
Settlement accrual, current liability |  |  |  | $ 479,000 |  |  |  | 478,750 |  |  |  |  | 478,750 |
Settlement accrual, non-current liabilities |  |  |  |  |  |  |  | 1,436,250 |  |  |  |  | $ 1,436,250 |
Settlement payments reserved |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  |  |  | $ 47,000 |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Indemnification Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement accrual |  |  |  |  |  |  |  |  | $ 14,500 |  |  |  |  |
Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected funding amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000
Expected beneficiary amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
Natural Disasters and Other Casualty Events | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount awarded |  |  |  | $ 1,990,000 |  |  |  |  |  |  |  |  |  |
Settlement funds | fund |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Installment payments | installment |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |
Number of conditions to trigger payments | condition |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants that submitted opt out forms | claim |  |  |  |  |  |  |  |  |  |  | 250 |  |  |
Percentage of claimants that submitted opt out forms |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Number of claimants that signed an individual settlement agreement | claim |  |  |  |  |  |  |  |  |  |  | 140 |  |  |
Natural Disasters and Other Casualty Events | Subrogation Insurers | Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of objections filed | claim |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Natural Disasters and Other Casualty Events | Subrogation Insurers | Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plaintiff reply brief period | 14 days |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Total Defendants | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount awarded |  |  |  | $ 4,040,000 |  |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 74,500 |  |  |  |  |  |
Committed contribution to humanitarian fund |  |  |  | $ 75,000 |  |  |  | 75,000 |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Tort-Related Legal Claims | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  |  |  |  |  |  |  | $ 40,000 |  |  |  |  |  |

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