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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues      
Revenues $ 3,465,215 $ 2,521,425  
Expenses:      
Depreciation of property, plant and equipment 256,069 246,158 $ 238,114
Total expenses 3,360,912 2,464,313 2,268,282
Less: Retirement defined benefits expense (credit)—other than service costs (4,411) (5,848) 3,210
Interest expense 116,703 99,403 99,808
Income before income taxes 304,195 310,863 240,624
Income tax benefits (61,167) (62,807) (40,910)
Net income for common stock 241,138 246,166 197,824
Hawaiian Electric (parent only)      
Revenues      
Revenues 320 105 208
Equity in net income of subsidiaries 273,076 278,743 227,098
Expenses:      
Operating, administrative and general 20,850 24,006 20,731
Depreciation of property, plant and equipment 399 414 485
Taxes, other than income taxes 732 514 654
Total expenses 21,981 24,934 21,870
Income before interest expense and income tax benefits 251,415 253,914 205,436
Less: Retirement defined benefits expense (credit)—other than service costs 147 (114) 634
Interest expense 21,997 18,444 18,237
Income before income taxes 229,271 235,584 186,565
Income tax benefits 11,867 10,582 11,259
Net income for common stock $ 241,138 $ 246,166 $ 197,824