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Electric utility segment - Commitments and contingencies (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 07, 2024 USD ($) MW | May 31, 2024 USD ($) MW | Mar. 28, 2024 USD ($) MW | Nov. 16, 2023 defendant | Jan. 31, 2024 | Jul. 31, 2018 MW | May 31, 2012 MW | Sep. 30, 2024 USD ($) agreement MW | Dec. 31, 2022 USD ($) | Dec. 31, 2019 agreement | Dec. 31, 2023 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  |  |  | $ 441,089 |  |  | $ 339,040
Operating lease right-of-use assets |  |  |  |  |  |  |  | $ 84,645 |  |  | 94,905
Environmental loss contingency, statement of financial position, not disclosed |  |  |  |  |  |  |  | reserve account balance |  |  |
Purchase obligation |  |  |  |  |  |  |  |  |  |  | 1,700,000
Maui Electric |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional accrued investigation and estimated cleanup costs |  |  |  |  |  |  |  | $ 2,500 |  |  |
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 |  |  |  |  |  |  |  | 61,007 |  |  | $ 71,877
Notice period, pre-cursor to citizen's suit |  |  |  |  | 60 days |  |  |  |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  |  |  |  |  | 7 |
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 |  |  |  |  |
James Campbell Company | Hawaiian Electric, Parent | Kapolei Petroleum Contamination |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Environmental remediation expense |  |  |  |  |  |  |  |  | $ 1,400 |  |
AES Hawaii | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW | 42 | 60 | 12.5 |  |  |  |  |  |  |  |
Total contracted PV capacity (in megawatts) | MW | 168 | 240 | 50 |  |  |  |  |  |  |  |
Annual payment | $ 11,500 | $ 13,200 | $ 3,200 |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  |  |  | 107,400 |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  | $ 107,400 |  |  |
Stage 1 And 2 Renewable PPAs | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  |  |  |  |  |  | 114.5 |  |  |
Total contracted PV capacity (in megawatts) | MW |  |  |  |  |  |  |  | 458 |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  |  |  | 3 |  |  |

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