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Electric utility segment - Power Purchase Agreements (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jan. 11, 2023 MWh number_of_projects MW | Jul. 31, 2022 MWh MW | Aug. 23, 2021 | Oct. 31, 2021 | Jul. 31, 2018 MW | May 31, 2018 MW | Feb. 28, 2018 USD ($) agreement MW | May 31, 2012 MW | Mar. 31, 1988 MW | Dec. 31, 2022 USD ($) | Jun. 30, 2022 MW | Mar. 31, 2021 MW | Dec. 31, 2022 USD ($) agreement MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 1988 MW
Stage 1 Renewable PPAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |
Purchase commitment, period |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment, minimum power volume required to be purchased | MW |  |  |  |  |  |  | 274.5 |  |  |  |  |  |  |  |  |
Long-term contract for purchase of electric power, estimated annual cost |  |  |  |  |  |  | $ 64,700 |  |  |  |  |  |  |  |  |
Generates in minimum volume required (in megawatts) | MW |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generates in minimum volume required (in megawatts hour) | MWh |  | 156 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stage 1 Renewable PPAs | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term purchase commitments, number of projects | number_of_projects | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generates in minimum volume required (in megawatts) | MW | 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generates in minimum volume required (in megawatts hour) | MWh | 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AES Hawaii |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment, period |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |
Purchase commitment, minimum power volume required to be purchased | MW |  |  |  |  |  |  |  |  | 180 |  |  |  |  |  |  |
Hu Honua Bioenergy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment, minimum power volume required to be purchased | 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 |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Kalaeloa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Long-term purchase commitment, power purchase price increase, percent |  |  |  |  |  |  |  |  |  | 68.00% |  |  |  |  |  |
Puna Geothermal Venture Power Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Firm capacity volume | MW |  |  |  |  |  |  |  |  |  |  | 25.7 | 13 |  |  |  |
Hawaiian Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | $ 794,000 | $ 670,000 | $ 569,000 |
Hawaiian Electric | Kalaeloa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 342,000 | 204,000 | 149,000 |
Purchase capacity amounts | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208
Hawaiian Electric | AES Hawaii |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 82,000 | 130,000 | 133,000 |
Hawaiian Electric | HPOWER |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 73,000 | 70,000 | 70,000 |
Hawaiian Electric | Hamakua Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 66,000 | 53,000 | 50,000 |
Hawaiian Electric | Puna Geothermal Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 48,000 | 29,000 | 1,000 |
Hawaiian Electric | Wind IPPs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 119,000 | 124,000 | 105,000 |
Hawaiian Electric | Solar IPPs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 57,000 | 50,000 | 57,000 |
Hawaiian Electric | Other IPPs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 | 10,000 | 4,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  |  |  |  |  |  |  |  |  | $ 793,584 | $ 670,494 | $ 568,749 |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Power purchase capacity excluding agreements with smaller IPPs (in megawatts) | MW |  |  |  |  |  |  |  |  |  |  |  |  | 362.2 |  |  |
Expected fixed capacity charges, year one |  |  |  |  |  |  |  |  |  | $ 74,000 |  |  | $ 74,000 |  |  |
Expected fixed capacity charges, year two |  |  |  |  |  |  |  |  |  | 74,000 |  |  | 74,000 |  |  |
Expected fixed capacity charges, year three |  |  |  |  |  |  |  |  |  | 74,000 |  |  | 74,000 |  |  |
Expected fixed capacity charges, year four |  |  |  |  |  |  |  |  |  | 74,000 |  |  | 74,000 |  |  |
Expected fixed capacity charges, year five |  |  |  |  |  |  |  |  |  | 74,000 |  |  | 74,000 |  |  |
Expected fixed capacity charges, after year five through fifteen years |  |  |  |  |  |  |  |  |  | $ 365,000 |  |  | $ 365,000 |  |  |
PGV Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power purchase capacity excluding agreements with smaller IPPs (in megawatts) | MW |  |  |  |  |  | 34.6 |  |  |  |  |  |  |  |  |  |

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- Definition Represents the entity's aggregate capacity utilized under power purchase agreements (PPAs) excluding power purchase agreements with smaller independent power producers and schedule Q providers. + References No definition available. + Details
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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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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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