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Electric utility segment - Condensed Consolidating Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Condensed Income Statements, Captions [Line Items]    
Revenues $ 744,070 $ 792,014
Expenses    
Total expenses 681,650 741,127
Operating income 62,420 50,887
Allowance for equity funds used during construction 3,585 3,640
Retirement defined benefits credit (expense)—other than service costs 917 1,001
Allowance for borrowed funds used during construction 1,417 1,386
Interest income 12,623 3,133
Income before income taxes 33,539 28,456
Income taxes 6,395 6,795
Net income attributable to Hawaiian Electric 27,144 42,595
Preferred stock dividends of Hawaiian Electric 473 473
Net income for common stock 26,671 42,122
Hawaiian Electric Consolidated    
Condensed Income Statements, Captions [Line Items]    
Revenues 738,366 788,578
Expenses    
Fuel oil 238,721 284,296
Purchased power 146,717 159,817
Other operation and maintenance 143,108 143,890
Depreciation 64,019 62,812
Taxes, other than income taxes 69,864 74,408
Total expenses 662,429 725,223
Operating income 75,937 63,355
Allowance for equity funds used during construction 3,585 3,640
Equity in earnings of subsidiaries 0 0
Retirement defined benefits credit (expense)—other than service costs 1,051 1,072
Interest expense and other charges, net (22,452) (19,985)
Allowance for borrowed funds used during construction 1,417 1,386
Interest income 1,981 1,432
Income before income taxes 61,519 50,900
Income taxes 13,204 11,180
Net income 48,315 39,720
Preferred stock dividends of subsidiaries 229 229
Net income attributable to Hawaiian Electric 48,086 39,491
Preferred stock dividends of Hawaiian Electric 270 270
Net income for common stock 47,816 39,221
Consolidating adjustments | Hawaiian Electric Consolidated    
Condensed Income Statements, Captions [Line Items]    
Revenues (3,294) 0
Expenses    
Fuel oil 0 0
Purchased power 0 0
Other operation and maintenance (3,294) 0
Depreciation 0 0
Taxes, other than income taxes 0 0
Total expenses (3,294) 0
Operating income 0 0
Allowance for equity funds used during construction 0 0
Equity in earnings of subsidiaries (9,725) (6,024)
Retirement defined benefits credit (expense)—other than service costs 0 0
Interest expense and other charges, net 1,123 1,452
Allowance for borrowed funds used during construction 0 0
Interest income (1,123) (1,452)
Income before income taxes (9,725) (6,024)
Income taxes 0 0
Net income (9,725) (6,024)
Preferred stock dividends of subsidiaries 0 0
Net income attributable to Hawaiian Electric (9,725) (6,024)
Preferred stock dividends of Hawaiian Electric 0 0
Net income for common stock (9,725) (6,024)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Income Statements, Captions [Line Items]    
Revenues 524,703 564,180
Expenses    
Fuel oil 171,793 210,199
Purchased power 110,731 117,518
Other operation and maintenance 91,493 90,884
Depreciation 42,573 42,004
Taxes, other than income taxes 49,779 53,409
Total expenses 466,369 514,014
Operating income 58,334 50,166
Allowance for equity funds used during construction 2,795 2,821
Equity in earnings of subsidiaries 9,725 6,024
Retirement defined benefits credit (expense)—other than service costs 905 927
Interest expense and other charges, net (17,024) (14,292)
Allowance for borrowed funds used during construction 1,168 1,079
Interest income 2,788 2,663
Income before income taxes 58,691 49,388
Income taxes 10,605 9,897
Net income 48,086 39,491
Preferred stock dividends of subsidiaries 0 0
Net income attributable to Hawaiian Electric 48,086 39,491
Preferred stock dividends of Hawaiian Electric 270 270
Net income for common stock 47,816 39,221
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Income Statements, Captions [Line Items]    
Revenues 108,311 117,609
Expenses    
Fuel oil 26,794 31,185
Purchased power 25,490 32,056
Other operation and maintenance 28,034 24,590
Depreciation 11,243 10,964
Taxes, other than income taxes 10,179 10,957
Total expenses 101,740 109,752
Operating income 6,571 7,857
Allowance for equity funds used during construction 347 349
Equity in earnings of subsidiaries 0 0
Retirement defined benefits credit (expense)—other than service costs 168 168
Interest expense and other charges, net (2,747) (2,914)
Allowance for borrowed funds used during construction 95 107
Interest income 229 155
Income before income taxes 4,663 5,722
Income taxes 933 1,198
Net income 3,730 4,524
Preferred stock dividends of subsidiaries 134 134
Net income attributable to Hawaiian Electric 3,596 4,390
Preferred stock dividends of Hawaiian Electric 0 0
Net income for common stock 3,596 4,390
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Income Statements, Captions [Line Items]    
Revenues 105,702 106,789
Expenses    
Fuel oil 40,134 42,912
Purchased power 10,496 10,243
Other operation and maintenance 26,211 28,416
Depreciation 10,203 9,844
Taxes, other than income taxes 9,906 10,042
Total expenses 96,950 101,457
Operating income 8,752 5,332
Allowance for equity funds used during construction 443 470
Equity in earnings of subsidiaries 0 0
Retirement defined benefits credit (expense)—other than service costs (22) (23)
Interest expense and other charges, net (3,804) (4,231)
Allowance for borrowed funds used during construction 154 200
Interest income 87 66
Income before income taxes 5,610 1,814
Income taxes 1,079 85
Net income 4,531 1,729
Preferred stock dividends of subsidiaries 95 95
Net income attributable to Hawaiian Electric 4,436 1,634
Preferred stock dividends of Hawaiian Electric 0 0
Net income for common stock 4,436 1,634
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated    
Condensed Income Statements, Captions [Line Items]    
Revenues 2,944 0
Expenses    
Fuel oil 0 0
Purchased power 0 0
Other operation and maintenance 664 0
Depreciation 0 0
Taxes, other than income taxes 0 0
Total expenses 664 0
Operating income 2,280 0
Allowance for equity funds used during construction 0 0
Equity in earnings of subsidiaries 0 0
Retirement defined benefits credit (expense)—other than service costs 0 0
Interest expense and other charges, net 0 0
Allowance for borrowed funds used during construction 0 0
Interest income 0 0
Income before income taxes 2,280 0
Income taxes 587 0
Net income 1,693 0
Preferred stock dividends of subsidiaries 0 0
Net income attributable to Hawaiian Electric 1,693 0
Preferred stock dividends of Hawaiian Electric 0 0
Net income for common stock $ 1,693 $ 0