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Electric utility segment - Power Purchase Agreements (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 21, 2023 MW | Oct. 31, 2021 | Jul. 31, 2018 MW | Feb. 28, 2018 USD ($) agreement MW | May 31, 2012 MW | Sep. 30, 2023 USD ($) project | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) project | Sep. 30, 2022 USD ($) | Dec. 31, 1988 MW | Dec. 31, 2022 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | $ 122,320 |  | $ 122,320 |  |  | $ 48,709
Kalaeloa |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase commitment, extension period (in years) |  | 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 |  |  |  | $ 71,200 |  |  |  |  |  |  |
Long term purchase commitments, number of projects | project |  |  |  |  |  | 3 |  | 3 |  |  |
Finance lease liabilities |  |  |  |  |  | $ 124,000 |  | $ 124,000 |  |  |
Financing lease right-of-use assets |  |  |  |  |  | 124,000 |  | 124,000 |  |  |
Total contracted PV capacity (in megawatts) | MW | 120 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 178,000 | $ 225,000 | 499,000 | $ 607,000 |  |
Hawaiian Electric, Parent | Kalaeloa |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 77,000 | 101,000 | 211,000 | 244,000 |  |
Increased power purchase commitment capacity (in megawatts) | MW |  |  |  |  |  |  |  |  |  | 208 |
Hawaiian Electric, Parent | AES Hawaii |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 0 | 21,000 | 0 | 82,000 |  |
Hawaiian Electric, Parent | HPOWER |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 17,000 | 18,000 | 51,000 | 56,000 |  |
Hawaiian Electric, Parent | Hamakua Energy |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 13,000 | 16,000 | 52,000 | 46,000 |  |
Hawaiian Electric, Parent | Puna Geothermal Venture |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 7,000 | 13,000 | 24,000 | 37,000 |  |
Hawaiian Electric, Parent | Wind IPPs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 42,000 | 37,000 | 99,000 | 93,000 |  |
Hawaiian Electric, Parent | Solar IPPs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | 21,000 | 18,000 | 57,000 | 44,000 |  |
Hawaiian Electric, Parent | Other IPPs |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  | $ 1,000 | $ 1,000 | $ 5,000 | $ 5,000 |  |

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- Definition Long-term Contract For Purchase Of Electric Power, Maximum Power Volume Delivered + References No definition available. + Details
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- Definition Long-term Contract For Purchase Of Electric Power, Total Contracted Battery Energy Storage System Capacity + References No definition available. + Details
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