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Income taxes - Schedule of Reconciliation of Amount of Income Taxes Computed at Federal Statutory Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Expense (Benefit) [Line Items]      
Amount at the federal statutory income tax rate $ 51,597 $ 63,881 $ 65,281
Increase (decrease) resulting from:      
State income taxes, net of federal income tax benefit 10,827 14,438 15,735
Net deferred tax asset (liability) adjustment related to the Tax Act (7,316) (9,886) (9,886)
Tax credits, net (4,070) (1,297) (4,473)
Other, net (6,465) (5,969) (3,850)
Total $ 44,573 $ 61,167 $ 62,807
Effective income tax rate (%) 18.10% 20.10% 20.20%
Hawaiian Electric Company, Inc. and Subsidiaries      
Income Tax Expense (Benefit) [Line Items]      
Amount at the federal statutory income tax rate $ 51,899 $ 50,526 $ 46,995
Increase (decrease) resulting from:      
State income taxes, net of federal income tax benefit 11,097 11,026 10,323
Net deferred tax asset (liability) adjustment related to the Tax Act (7,316) (9,886) (9,886)
Tax credits, net (2,251) (397) (2,203)
Other, net (2,236) (1,593) (1,081)
Total $ 51,193 $ 49,676 $ 44,148
Effective income tax rate (%) 20.70% 20.60% 19.70%