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Electric utility segment - Condensed Consolidating Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Condensed Income Statements, Captions [Line Items]        
Revenues $ 746,392 $ 795,417 $ 1,490,462 $ 1,587,431
Expenses        
Wildfire tort-related claims       1,712,000
Total expenses 692,645 2,457,006 1,374,295 3,198,133
Operating income (loss) 53,747 (1,661,589) 116,167 (1,610,702)
Allowance for equity funds used during construction 3,702 3,336 7,287 6,976
Retirement defined benefits credit (expense)—other than service costs 919 1,001 1,836 2,002
Allowance for borrowed funds used during construction 1,462 1,344 2,879 2,730
Interest income 7,579 3,134 20,202 6,267
Income (loss) before income taxes 39,975 (1,685,174) 73,514 (1,656,718)
Income taxes 13,417 (435,950) 19,812 (429,155)
Net income (loss) attributable to Hawaiian Electric     53,702 (1,252,416)
Preferred stock dividends of Hawaiian Electric 473 473 946 946
Net income (loss) for common stock 26,085 (1,295,484) 52,756 (1,253,362)
Hawaiian Electric Consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 742,482 792,331 1,480,848 1,580,909
Expenses        
Fuel oil 210,587 258,652 449,308 542,948
Purchased power 174,963 181,328 321,680 341,145
Other operation and maintenance 158,217 147,561 301,325 291,451
Wildfire tort-related claims 0 1,712,000 0 1,712,000
Depreciation 63,974 62,812 127,993 125,624
Taxes, other than income taxes 70,197 74,418 140,061 148,826
Total expenses 677,938 2,436,771 1,340,367 3,161,994
Operating income (loss) 64,544 (1,644,440) 140,481 (1,581,085)
Allowance for equity funds used during construction 3,702 3,336 7,287 6,976
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs 1,052 1,072 2,103 2,144
Interest expense and other charges, net (21,706) (21,417) (44,158) (41,402)
Allowance for borrowed funds used during construction 1,462 1,344 2,879 2,730
Interest income 1,215 1,452 3,196 2,884
Income (loss) before income taxes 50,269 (1,658,653) 111,788 (1,607,753)
Income taxes 10,620 (429,758) 23,824 (418,578)
Net income (loss) 39,649 (1,228,895) 87,964 (1,189,175)
Preferred stock dividends of subsidiaries 229 229 458 458
Net income (loss) attributable to Hawaiian Electric 39,420 (1,229,124) 87,506 (1,189,633)
Preferred stock dividends of Hawaiian Electric 270 270 540 540
Net income (loss) for common stock 39,150 (1,229,394) 86,966 (1,190,173)
Consolidating adjustments | Hawaiian Electric Consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues (3,916) 0 (7,210) 0
Expenses        
Fuel oil 0 0 0 0
Purchased power 0 0 0 0
Other operation and maintenance (3,916) 0 (7,210) 0
Wildfire tort-related claims   0   0
Depreciation 0 0 0 0
Taxes, other than income taxes 0 0 0 0
Total expenses (3,916) 0 (7,210) 0
Operating income (loss) 0 0 0 0
Allowance for equity funds used during construction 0 0 0 0
Equity in earnings of subsidiaries (7,767) 246,099 (17,492) 240,075
Retirement defined benefits credit (expense)—other than service costs 0 0 0 0
Interest expense and other charges, net 1,212 1,833 2,335 3,285
Allowance for borrowed funds used during construction 0 0 0 0
Interest income (1,212) (1,833) (2,335) (3,285)
Income (loss) before income taxes (7,767) 246,099 (17,492) 240,075
Income taxes 0 0 0 0
Net income (loss) (7,767) 246,099 (17,492) 240,075
Preferred stock dividends of subsidiaries 0 0 0 0
Net income (loss) attributable to Hawaiian Electric (7,767) 246,099 (17,492) 240,075
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income (loss) for common stock (7,767) 246,099 (17,492) 240,075
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 524,804 564,628 1,049,507 1,128,808
Expenses        
Fuel oil 148,374 187,386 320,167 397,585
Purchased power 131,259 137,139 241,990 254,657
Other operation and maintenance 103,195 93,717 194,688 184,601
Wildfire tort-related claims   1,369,600   1,369,600
Depreciation 42,529 42,003 85,102 84,007
Taxes, other than income taxes 49,737 53,214 99,516 106,623
Total expenses 475,094 1,883,059 941,463 2,397,073
Operating income (loss) 49,710 (1,318,431) 108,044 (1,268,265)
Allowance for equity funds used during construction 2,837 2,578 5,632 5,399
Equity in earnings of subsidiaries 7,767 (246,099) 17,492 (240,075)
Retirement defined benefits credit (expense)—other than service costs 906 928 1,811 1,855
Interest expense and other charges, net (16,288) (15,717) (33,312) (30,009)
Allowance for borrowed funds used during construction 1,185 1,034 2,353 2,113
Interest income 2,027 2,972 4,815 5,635
Income (loss) before income taxes 48,144 (1,572,735) 106,835 (1,523,347)
Income taxes 8,724 (343,611) 19,329 (333,714)
Net income (loss) 39,420 (1,229,124) 87,506 (1,189,633)
Preferred stock dividends of subsidiaries 0 0 0 0
Net income (loss) attributable to Hawaiian Electric 39,420 (1,229,124) 87,506 (1,189,633)
Preferred stock dividends of Hawaiian Electric 270 270 540 540
Net income (loss) for common stock 39,150 (1,229,394) 86,966 (1,190,173)
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 110,973 117,663 219,284 235,272
Expenses        
Fuel oil 26,697 28,941 53,491 60,126
Purchased power 27,657 31,068 53,147 63,124
Other operation and maintenance 25,749 24,544 53,783 49,134
Wildfire tort-related claims   171,200   171,200
Depreciation 11,242 10,964 22,485 21,928
Taxes, other than income taxes 10,372 10,943 20,551 21,900
Total expenses 101,717 277,660 203,457 387,412
Operating income (loss) 9,256 (159,997) 15,827 (152,140)
Allowance for equity funds used during construction 351 288 698 637
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs 168 168 336 336
Interest expense and other charges, net (2,738) (2,974) (5,485) (5,888)
Allowance for borrowed funds used during construction 96 85 191 192
Interest income 361 241 590 396
Income (loss) before income taxes 7,494 (162,189) 12,157 (156,467)
Income taxes 1,660 (42,027) 2,593 (40,829)
Net income (loss) 5,834 (120,162) 9,564 (115,638)
Preferred stock dividends of subsidiaries 134 133 268 267
Net income (loss) attributable to Hawaiian Electric 5,700 (120,295) 9,296 (115,905)
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income (loss) for common stock 5,700 (120,295) 9,296 (115,905)
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 107,757 110,040 213,459 216,829
Expenses        
Fuel oil 35,516 42,325 75,650 85,237
Purchased power 16,047 13,121 26,543 23,364
Other operation and maintenance 31,627 29,300 57,838 57,716
Wildfire tort-related claims   171,200   171,200
Depreciation 10,203 9,845 20,406 19,689
Taxes, other than income taxes 10,087 10,261 19,993 20,303
Total expenses 103,480 276,052 200,430 377,509
Operating income (loss) 4,277 (166,012) 13,029 (160,680)
Allowance for equity funds used during construction 514 470 957 940
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs (22) (24) (44) (47)
Interest expense and other charges, net (3,892) (4,559) (7,696) (8,790)
Allowance for borrowed funds used during construction 181 225 335 425
Interest income 39 72 126 138
Income (loss) before income taxes 1,097 (169,828) 6,707 (168,014)
Income taxes (99) (44,120) 980 (44,035)
Net income (loss) 1,196 (125,708) 5,727 (123,979)
Preferred stock dividends of subsidiaries 95 96 190 191
Net income (loss) attributable to Hawaiian Electric 1,101 (125,804) 5,537 (124,170)
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income (loss) for common stock 1,101 (125,804) 5,537 (124,170)
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 2,864 0 5,808 0
Expenses        
Fuel oil 0 0 0 0
Purchased power 0 0 0 0
Other operation and maintenance 1,562 0 2,226 0
Wildfire tort-related claims   0   0
Depreciation 0 0 0 0
Taxes, other than income taxes 1 0 1 0
Total expenses 1,563 0 2,227 0
Operating income (loss) 1,301 0 3,581 0
Allowance for equity funds used during construction 0 0 0 0
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs 0 0 0 0
Interest expense and other charges, net 0 0 0 0
Allowance for borrowed funds used during construction 0 0 0 0
Interest income 0 0 0 0
Income (loss) before income taxes 1,301 0 3,581 0
Income taxes 335 0 922 0
Net income (loss) 966 0 2,659 0
Preferred stock dividends of subsidiaries 0 0 0 0
Net income (loss) attributable to Hawaiian Electric 966 0 2,659 0
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income (loss) for common stock $ 966 $ 0 $ 2,659 $ 0