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Maui windstorm and wildfires - Narrative (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2024 claim plaintiff | Aug. 02, 2024 USD ($) installment | May 04, 2024 USD ($) | Aug. 08, 2023 USD ($) | Feb. 08, 2024 claim | Jun. 08, 2024 claim | Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jul. 15, 2024 claim | Dec. 31, 2023 USD ($) | Nov. 08, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | $ 322,409 | $ 322,409 |  | $ 294,804 |
Property insurance policy limit |  |  |  | $ 500,000 |  |  |  |  |  |  |
Retention for property damages |  |  |  | $ 1,000 |  |  |  |  |  |  |
Excess liability insurance |  |  |  |  |  |  |  | 41,000 |  |  |
Miscellaneous professional liability |  |  |  |  |  |  |  | 25,000 |  |  |
Directors and officers liability insurance |  |  |  |  |  |  |  | 133,000 |  |  |
Other accrued expense |  |  |  |  |  |  | 1,712,000 | 1,712,000 |  | $ 75,000 |
Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  |  | 34,800 | 34,800 |  |  |
Indemnification Agreement |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  |  | $ 18,400 |  |  |  |  |  |  |  |
Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 700 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Shareholder Derivative Actions, Northern District Of California |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  | 3 |  |  |  |  |  |
Shareholder Derivative Actions, District Of Hawaii |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim |  |  |  |  |  | 2 |  |  |  |  |
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 | 160 |  |  |  |  |  |  |  |  |  |
County Of Maui | Maui Wildfire Negligence | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 1 |  |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  |  |  |  | 29,600 | 29,600 |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Indemnification Agreement |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other accrued expense |  |  |  |  |  |  | 10,600 | 10,600 |  |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of claim forms | claim |  |  |  |  |  |  |  |  | 35 |  |
Number of physical injury related claim forms | claim |  |  |  |  |  |  |  |  | 12 |  |
Natural Disasters and Other Casualty Events | Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  | $ 1,990,000 |  |  |  |  |  |  |  |  |
Installment payments | installment |  | 4 |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc, State Of Hawaii, County Of Maui, Kemehameha Schools, West Maui Land Col., Hawaiian Telecom And Spectrum/Charter Communications | Tort-Related Legal Claims | Maui Windstorm and Wildfires | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  | $ 4,040,000 |  |  |  |  |  |  |  |  |
Claim resolution period |  | 90 days |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 30,200 | 30,200 |  |  |
Committed contribution to humanitarian fund |  |  |  |  |  |  | 75,000 | 75,000 |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committed contribution to humanitarian fund |  | $ 75,000 |  |  |  |  |  |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental expenses |  |  |  |  |  |  | 2,100 | 7,700 |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Wildfire tort-related claims |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated loss liabilities |  |  |  |  |  |  | $ 1,710,000 | $ 1,710,000 |  |  |

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