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Electric utility segment - Commitments and contingencies (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 28, 2024 USD ($) MW | Apr. 30, 2024 USD ($) | Feb. 28, 2023 | Jul. 31, 2018 MW | May 31, 2012 MW | Mar. 31, 2024 USD ($) agreement MW | Dec. 31, 2022 USD ($) | Dec. 31, 2019 agreement | Dec. 31, 2023 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | $ 91,182 |  |  | $ 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 |  |  |  |  |  | 9,600 |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | 68,217 |  |  | $ 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 |  |  |  |
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 |  |  |  |  |  |  | $ 800 |  |
James Campbell Company | Hawaiian Electric, Parent | Kapolei Petroleum Contamination | Subsequent Event |  |  |  |  |  |  |  |  |
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 | 12.5 |  |  |  |  |  |  |  |
Total contracted PV capacity (in megawatts) | MW | 50 |  |  |  |  |  |  |  |
Annual payment | $ 3,200 |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | $ 12,200 |  |  |
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 |  |  |  |  |  | 117.5 |  |  |
Total contracted PV capacity (in megawatts) | MW |  |  |  |  |  | 1,035 |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  | 5 |  |  |

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