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Electric utility segment - Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Regulatory assets |  |
Regulatory assets | $ 565,543 | $ 766,708
Regulatory liabilities |  |
Regulatory liabilities | 996,768 | 959,786
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Regulatory assets |  |
Regulatory assets | 565,543 | 766,708
Regulatory liabilities |  |
Regulatory liabilities | 996,768 | 959,786
Hawaiian Electric Company, Inc. and Subsidiaries | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Regulatory liabilities | 562,514 | 541,730
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes |  |
Regulatory liabilities |  |
Regulatory liabilities | 337,304 | 360,426
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account and RAM |  |
Regulatory liabilities |  |
Regulatory liabilities | 251 | 1,957
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans |  |
Regulatory liabilities |  |
Regulatory liabilities | 51,734 | 29,759
Hawaiian Electric Company, Inc. and Subsidiaries | Solar tax credits |  |
Regulatory liabilities |  |
Regulatory liabilities | 27,123 | 8,096
Hawaiian Electric Company, Inc. and Subsidiaries | Other |  |
Regulatory liabilities |  |
Regulatory liabilities | $ 17,842 | 17,818
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Income taxes |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Decoupling revenue balancing account and RAM |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Solar tax credits |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other |  |
Regulatory liabilities |  |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 79 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Income taxes |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 55 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Decoupling revenue balancing account and RAM |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 2 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Solar tax credits |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 20 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other |  |
Regulatory liabilities |  |
Remaining amortization or recovery periods | 4 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Current assets |  |
Regulatory assets |  |
Regulatory assets | $ 66,664 | 30,435
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term assets |  |
Regulatory assets |  |
Regulatory assets | 498,879 | 736,273
Hawaiian Electric Company, Inc. and Subsidiaries | Current liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | 29,760 | 37,301
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | 967,008 | 922,485
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans (balance primarily varies with plans’ funded statuses) |  |
Regulatory assets |  |
Regulatory assets | 351,070 | 592,644
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes |  |
Regulatory assets |  |
Regulatory assets | $ 88,087 | 96,171
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes | Minimum |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes | Maximum |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 55 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account and RAM |  |
Regulatory assets |  |
Regulatory assets | $ 31,607 | 10,432
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account and RAM | Minimum |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account and RAM | Maximum |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 2 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Regulatory assets | $ 7,300 | 8,654
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances | Minimum |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances | Maximum |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 18 years |
Remaining amortization or recovery periods | 18 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Vacation earned, but not yet taken |  |
Regulatory assets |  |
Regulatory assets | $ 14,255 | 15,665
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | COVID-19 related costs (to be determined by PUC) |  |
Regulatory assets |  |
Regulatory assets | $ 27,839 | 18,032
Hawaiian Electric Company, Inc. and Subsidiaries | Other |  |
Regulatory assets |  |
Regulatory assets | $ 45,385 | $ 25,110
Hawaiian Electric Company, Inc. and Subsidiaries | Other | Minimum |  |
Regulatory assets |  |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Other | Maximum |  |
Regulatory assets |  |
Remaining amortization or recovery periods | 38 years |

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