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Income taxes - Schedule of Components of Income Taxes Attributable to Net Income for Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Federal      
Current $ 30,909 $ 77,595 $ 51,455
Deferred 1,072 (37,410) (11,689)
Deferred tax credits, net 52 4,031 4,611
Federal taxes 32,033 44,216 44,377
State      
Current 8,344 11,981 12,119
Deferred 4,196 4,914 6,290
Deferred tax credits, net 0 56 21
State taxes 12,540 16,951 18,430
Total 44,573 61,167 62,807
Hawaiian Electric Company, Inc. and Subsidiaries      
Federal      
Current 40,365 75,118 42,794
Deferred (3,444) (39,646) (12,109)
Deferred tax credits, net 22 137 302
Federal taxes 36,943 35,609 30,987
State      
Current 9,367 15,780 4,861
Deferred 4,883 (1,769) 8,279
Deferred tax credits, net 0 56 21
State taxes 14,250 14,067 13,161
Total $ 51,193 $ 49,676 $ 44,148