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Electric utility segment - Most recent rate proceedings (Details) - Hawaiian Electric Company, Inc. and Subsidiaries $ in Millions |  |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Jun. 09, 2022 USD ($) | Mar. 01, 2022 USD ($) | Oct. 30, 2020 USD ($) installation | Dec. 31, 2021 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Recovery of deferral costs | $ 27.8 |  |  |
Recovery of deferral costs period | 3 years |  |  |
Public utilities, electric distribution system, contract period |  | 50 years | 50 years |
Number of U.S. army installations being serviced | installation |  |  | 12 |
Purchase price |  | $ 14.5 |  |
price of acquisition, expected |  |  | $ 4.0 |
Transition period |  | 1 year |  |
Capital upgrade over the period |  | 6 years |  |
COVID-19 |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Customer bill forgiveness |  |  |  | $ 2.0

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- Details
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