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Electric utility segment - Power purchase agreements (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2018 MW | May 31, 2012 MW | Mar. 31, 1988 MW | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) MW | Jun. 30, 2020 USD ($) | Dec. 31, 1988 MW
AES Hawaii |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchase commitment, period (in years) |  |  | 30 years |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  | 180 |  |  |  |  |
Additional capacity requirement (in megawatts) | MW |  |  |  |  |  | 9 |  |
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 |  |  |  |  |  |  |
Kalaeloa |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
PPA termination period |  |  |  |  |  | 60 days |  |
Hawaiian Electric, Parent |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | $ 163 | $ 137 | $ 305 | $ 277 |
Hawaiian Electric, Parent | Kalaeloa |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 49 | 34 | 86 | 72 |
Increased power purchase commitment capacity (in megawatts) | MW |  |  |  |  |  |  |  | 208
Hawaiian Electric, Parent | AES Hawaii |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 36 | 32 | 66 | 63 |
Hawaiian Electric, Parent | HPOWER |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 14 | 17 | 31 | 34 |
Hawaiian Electric, Parent | Hamakua Energy |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 12 | 11 | 23 | 24 |
Hawaiian Electric, Parent | Puna Geothermal Venture |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 7 | 0 | 11 | 0 |
Hawaiian Electric, Parent | Wind IPPs |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 28 | 25 | 57 | 53 |
Hawaiian Electric, Parent | Solar IPPs |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | 16 | 17 | 28 | 28 |
Hawaiian Electric, Parent | Other IPPs |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |
Purchased power |  |  |  | $ 1 | $ 1 | $ 3 | $ 3 |

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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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