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Electric utility segment - Commitments and contingencies (Details) $ in Thousands |  |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 11, 2025 USD ($) MW | Mar. 25, 2025 USD ($) MW | Nov. 16, 2023 defendant | Jul. 31, 2018 MW | May 31, 2012 MW | Jun. 30, 2025 USD ($) agreement MW | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Environmental loss contingency, statement of financial position, not disclosed |  |  |  |  |  | reserve account balance |  |
Purchase obligation |  |  |  |  |  |  |  | $ 2,200,000
Operating lease right-of-use assets |  |  |  |  |  | $ 62,065 |  | 66,553
Maui Electric |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Additional accrued investigation and estimated cleanup costs |  |  |  |  |  | 2,400 |  |
Hawaiian Electric, Parent | PCB Contamination |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Valuation allowances and reserves |  |  |  |  |  | 9,500 |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | $ 60,943 |  | $ 59,281
Hu Honua Bioenergy, LLC |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  |  |  | 21.5 |  |  |
Number of defendants | defendant |  |  | 3 |  |  |  |  |
Molokai New Energy Partners |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Total contracted PV capacity (in megawatts) | MW |  |  |  | 4.88 |  |  |  |
Total contracted battery energy storage system capacity | MW |  |  |  | 3 |  |  |  |
Maximum power volume to be delivered (in megawatts) | MW |  |  |  | 2.64 |  |  |  |
Stage1 And2 Renewable P P | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  | 30 |  |  |  | 249.5 |  |
Total contracted PV capacity (in megawatts) | MW |  | 120 |  |  |  | 1,563 |  |
Annual payment |  | $ 11,900 |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | $ 42,300 |
Finance lease liabilities |  |  |  |  |  |  | $ 42,300 |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  | 8 |  |
Hoohana Solar | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW | 52 |  |  |  |  |  |  |
Total contracted PV capacity (in megawatts) | MW | 208 |  |  |  |  |  |  |
Annual payment | $ 13,400 |  |  |  |  |  |  |
Hoohana Solar | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event | Forecast |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets | 51,300 |  |  |  |  |  |  |
Finance lease liabilities | $ 51,300 |  |  |  |  |  |  |

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