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Maui windstorm and wildfires - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 09, 2024 claim plaintiff | May 04, 2024 USD ($) | Aug. 08, 2023 USD ($) | Mar. 31, 2024 USD ($) | May 08, 2024 claim registrationForm | May 03, 2024 claim | Mar. 22, 2024 claim | Dec. 31, 2023 USD ($) | Nov. 08, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | $ 315,067 |  |  |  | $ 294,804 |
Property insurance policy limit |  |  | $ 500,000 |  |  |  |  |  |
Retention for property damages |  |  | $ 1,000 |  |  |  |  |  |
Insurance Claims, Legal-Related Recoveries |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Insurance reimbursement receivable |  |  |  | 28,700 |  |  |  |  |
Subsequent Event | Indemnification Agreement |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Amount agreed to contribute |  | $ 18,400 |  |  |  |  |  |  |
Tort-Related Legal Claims | Subsequent Event | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 400 |  |  |  |  |  |  |  |
Maui Wildfire Negligence | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Excess liability insurance |  |  |  | 165,000 |  |  |  |  |
Excess liability insurance, retention amount |  |  |  | 300 |  |  |  |  |
Directors and officers liability insurance |  |  |  | 145,000 |  |  |  |  |
Directors and officers liability insurance, retention |  |  |  | 1,000 |  |  |  |  |
Maui Wildfire Negligence | Maui Windstorm and Wildfires | Upcountry Maui |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  |  |  |  |  |  | 6 |  |
Maui Wildfire Negligence | Subsequent Event | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of pending claims | claim | 1 |  |  |  |  |  |  |  |
Maui Wildfire Negligence | Subsequent Event | Maui Windstorm and Wildfires | Lahaina |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  |  |  |  |  | 4 |  |  |
County Of Maui | Maui Wildfire Negligence | Subsequent Event | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 1 |  |  |  |  |  |  |  |
Subrogation Insurers | Maui Wildfire Negligence | Subsequent Event | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Lawsuit claim filed | claim | 3 |  |  |  |  |  |  |  |
Number of cases filed by subrogation insurers | plaintiff | 160 |  |  |  |  |  |  |  |
HEI, The Utilities, And Other Defendants | Climate Change | Subsequent Event | Maui Windstorm and Wildfires |  |  |  |  |  |  |  |  |
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 |  |  |  | 22,100 |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Indemnification Agreement |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Other accrued expense |  |  |  | 6,700 |  |  |  |  |
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 |  |  |  |  | 12 |  |  |  |
Number of registration forms | registrationForm |  |  |  |  | 43 |  |  |  |
Number of physical injury related claim forms | claim |  |  |  |  | 2 |  |  |  |
Number of physical injury related registration forms | registrationForm |  |  |  |  | 15 |  |  |  |
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 22,600 |  |  |  |  |
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 |  |  |  | $ 5,600 |  |  |  |  |

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