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Electric utility segment - Power Purchase Agreements (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 21, 2023 MW | Oct. 31, 2021 | Jul. 31, 2018 MW | Feb. 28, 2018 USD ($) agreement MW | May 31, 2012 MW | Jun. 30, 2023 USD ($) project | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) project | Jun. 30, 2022 USD ($) | Dec. 31, 1988 MW | Dec. 31, 2022 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | $ 123,240 |  | $ 123,240 |  |  | $ 48,709
Kalaeloa |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase commitment, extension period |  | 10 years |  |  |  |  |  |  |  |  |
Stage 1 Renewable PPAs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  | 8 |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW | 30 |  |  | 274.5 |  |  |  |  |  |  |
Estimated annual cost |  |  |  | $ 70,800 |  |  |  |  |  |  |
Long term purchase commitments, number of projects | project |  |  |  |  |  | 3 |  | 3 |  |  |
Total contracted PV capacity (in megawatts) | MW | 120 |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | $ 124,000 |  | $ 124,000 |  |  |
Financing lease right-of-use assets |  |  |  |  |  | 124,000 |  | 124,000 |  |  |
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 |  |  |  |  |  |  |  |
Hawaiian Electric, Parent |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 168,000 | $ 218,000 | 321,000 | $ 382,000 |  |
Hawaiian Electric, Parent | Kalaeloa |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 67,000 | 83,000 | 134,000 | 143,000 |  |
Increased power purchase commitment capacity (in megawatts) | MW |  |  |  |  |  |  |  |  |  | 208 |
Hawaiian Electric, Parent | AES Hawaii |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 0 | 34,000 | 0 | 61,000 |  |
Hawaiian Electric, Parent | HPOWER |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 16,000 | 19,000 | 34,000 | 38,000 |  |
Hawaiian Electric, Parent | Hamakua Energy |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 19,000 | 14,000 | 39,000 | 30,000 |  |
Hawaiian Electric, Parent | Puna Geothermal Venture |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 9,000 | 14,000 | 17,000 | 24,000 |  |
Hawaiian Electric, Parent | Wind IPPs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 33,000 | 38,000 | 57,000 | 56,000 |  |
Hawaiian Electric, Parent | Solar IPPs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 22,000 | 13,000 | 36,000 | 26,000 |  |
Hawaiian Electric, Parent | Other IPPs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | $ 2,000 | $ 3,000 | $ 4,000 | $ 4,000 |  |

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