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Electric utility segment - Power purchase agreements (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 23, 2021 | Jan. 31, 2022 USD ($) | Oct. 31, 2021 | Jul. 31, 2018 MW | May 31, 2012 MW | Mar. 31, 1988 MW | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 1988 MW | Dec. 31, 2021 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease liabilities |  |  |  |  |  |  | $ 151,832 |  |  | $ 136,760
Kalaeloa |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment, extension period |  |  | 10 years |  |  |  |  |  |  |
Purchase commitment, price increase percentage |  |  |  |  |  |  | 62.00% |  |  |
AES Hawaii |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment, period (in years) |  |  |  |  |  | 30 years |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  |  |  |  | 180 |  |  |  |
Hu Honua Bioenergy, LLC |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  |  |  | 21.5 |  |  |  |  |
Molokai New Energy Partners |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [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 |  |  |  |  |  |
Sause Bros., Inc. |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment, period (in years) | 5 years |  |  |  |  |  |  |  |  |
Annual base rent |  | $ 6,200 |  |  |  |  |  |  |  |
Operating lease liabilities |  | $ 32,000 |  |  |  |  |  |  |  |
Hawaiian Electric, Parent |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | $ 164,000 | $ 142,000 |  |
Hawaiian Electric, Parent | Kalaeloa |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 60,000 | 37,000 |  |
Increased power purchase commitment capacity (in megawatts) | MW |  |  |  |  |  |  |  |  | 208 |
Hawaiian Electric, Parent | AES Hawaii |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 27,000 | 30,000 |  |
Hawaiian Electric, Parent | HPOWER |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 19,000 | 17,000 |  |
Hawaiian Electric, Parent | Hamakua Energy |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 16,000 | 11,000 |  |
Hawaiian Electric, Parent | Puna Geothermal Venture |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 10,000 | 4,000 |  |
Hawaiian Electric, Parent | Wind IPPs |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 18,000 | 29,000 |  |
Hawaiian Electric, Parent | Solar IPPs |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | 13,000 | 12,000 |  |
Hawaiian Electric, Parent | Other IPPs |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  | $ 1,000 | $ 2,000 |  |

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