v3.26.1
Electric utility segment - Schedule of Condensed Consolidating Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Condensed Income Statements, Captions [Line Items]        
Revenues $ 939,703 $ 746,392 $ 1,686,150 $ 1,490,462
Expenses        
Wildfire tort-related claims (154,000)   (154,000)  
Total expenses 735,489 692,645 1,428,559 1,374,295
Operating income (loss) 204,214 53,747 257,591 116,167
Allowance for equity funds used during construction 4,387 3,702 8,151 7,287
Retirement defined benefits credit (expense)—other than service costs 879 919 1,758 1,836
Allowance for borrowed funds used during construction 1,997 1,462 3,702 2,879
Interest income   7,579   20,202
Income before income taxes 164,662 39,975 203,254 73,514
Income tax expense 41,462 13,417 49,604 19,812
Net income attributable to Hawaiian Electric     153,650 53,702
Preferred stock dividends of Hawaiian Electric 0 473 0 946
Net income for common stock 123,200 26,085 153,650 52,756
Hawaiian Electric consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 936,864 742,482 1,680,904 1,480,848
Expenses        
Fuel oil 336,615 210,587 573,528 449,308
Purchased power 223,559 174,963 368,833 321,680
Other operation and maintenance 166,743 158,217 328,960 301,325
Wildfire tort-related claims (162,383) 0 (162,383) 0
Depreciation 66,447 63,974 132,893 127,993
Taxes, other than income taxes 87,319 70,197 157,976 140,061
Total expenses 718,300 677,938 1,399,807 1,340,367
Operating income (loss) 218,564 64,544 281,097 140,481
Allowance for equity funds used during construction 4,387 3,702 8,151 7,287
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs 1,049 1,052 2,099 2,103
Interest expense and other charges, net (45,351) (21,706) (73,227) (44,158)
Allowance for borrowed funds used during construction 1,997 1,462 3,702 2,879
Interest income 2,713 1,215 6,581 3,196
Income before income taxes 183,359 50,269 228,403 111,788
Income tax expense 45,501 10,620 55,202 23,824
Net income 137,858 39,649 173,201 87,964
Preferred stock dividends of subsidiaries 0 229 0 458
Net income attributable to Hawaiian Electric 137,858 39,420 173,201 87,506
Preferred stock dividends of Hawaiian Electric 0 270 0 540
Net income for common stock 137,858 39,150 173,201 86,966
Consolidating adjustments | Hawaiian Electric consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues (3,656) (3,916) (7,150) (7,210)
Expenses        
Fuel oil 0 0 0 0
Purchased power 0 0 0 0
Other operation and maintenance (3,656) (3,916) (7,150) (7,210)
Wildfire tort-related claims 0   0  
Depreciation 0 0 0 0
Taxes, other than income taxes 0 0 0 0
Total expenses (3,656) (3,916) (7,150) (7,210)
Operating income (loss) 0 0 0 0
Allowance for equity funds used during construction 0 0 0 0
Equity in earnings of subsidiaries (28,962) (7,767) (36,136) (17,492)
Retirement defined benefits credit (expense)—other than service costs 0 0 0 0
Interest expense and other charges, net 2,572 1,212 4,591 2,335
Allowance for borrowed funds used during construction 0 0 0 0
Interest income (2,572) (1,212) (4,591) (2,335)
Income before income taxes (28,962) (7,767) (36,136) (17,492)
Income tax expense 0 0 0 0
Net income   (7,767) (36,136) (17,492)
Preferred stock dividends of subsidiaries   0   0
Net income attributable to Hawaiian Electric   (7,767)   (17,492)
Preferred stock dividends of Hawaiian Electric   0   0
Net income for common stock (28,962) (7,767) (36,136) (17,492)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 681,861 524,804 1,210,220 1,049,507
Expenses        
Fuel oil 251,085 148,374 427,763 320,167
Purchased power 170,253 131,259 273,249 241,990
Other operation and maintenance 112,042 103,195 218,482 194,688
Wildfire tort-related claims (129,907)   (129,907)  
Depreciation 44,079 42,529 88,158 85,102
Taxes, other than income taxes 63,630 49,737 113,901 99,516
Total expenses 511,182 475,094 991,646 941,463
Operating income (loss) 170,679 49,710 218,574 108,044
Allowance for equity funds used during construction 3,379 2,837 6,197 5,632
Equity in earnings of subsidiaries 28,962 7,767 36,136 17,492
Retirement defined benefits credit (expense)—other than service costs 902 906 1,805 1,811
Interest expense and other charges, net (36,266) (16,288) (58,417) (33,312)
Allowance for borrowed funds used during construction 1,542 1,185 2,823 2,353
Interest income 4,888 2,027 10,356 4,815
Income before income taxes 174,086 48,144 217,474 106,835
Income tax expense 36,228 8,724 44,273 19,329
Net income   39,420 173,201 87,506
Preferred stock dividends of subsidiaries   0   0
Net income attributable to Hawaiian Electric   39,420   87,506
Preferred stock dividends of Hawaiian Electric   270   540
Net income for common stock 137,858 39,150 173,201 86,966
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 123,975 110,973 234,097 219,284
Expenses        
Fuel oil 25,387 26,697 47,219 53,491
Purchased power 40,325 27,657 71,939 53,147
Other operation and maintenance 26,896 25,749 54,866 53,783
Wildfire tort-related claims (16,238)   (16,238)  
Depreciation 11,671 11,242 23,341 22,485
Taxes, other than income taxes 11,467 10,372 21,805 20,551
Total expenses 99,508 101,717 202,932 203,457
Operating income (loss) 24,467 9,256 31,165 15,827
Allowance for equity funds used during construction 312 351 616 698
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs 170 168 340 336
Interest expense and other charges, net (5,014) (2,738) (8,208) (5,485)
Allowance for borrowed funds used during construction 90 96 178 191
Interest income 354 361 732 590
Income before income taxes 20,379 7,494 24,823 12,157
Income tax expense 5,028 1,660 5,914 2,593
Net income   5,834 18,909 9,564
Preferred stock dividends of subsidiaries   134   268
Net income attributable to Hawaiian Electric   5,700   9,296
Preferred stock dividends of Hawaiian Electric   0   0
Net income for common stock 15,351 5,700 18,909 9,296
Maui Electric | Reportable Legal Entities | Hawaiian Electric consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 131,568 107,757 237,667 213,459
Expenses        
Fuel oil 60,143 35,516 98,546 75,650
Purchased power 12,981 16,047 23,645 26,543
Other operation and maintenance 30,490 31,627 60,844 57,838
Wildfire tort-related claims (16,238)   (16,238)  
Depreciation 10,697 10,203 21,394 20,406
Taxes, other than income taxes 12,221 10,087 22,269 19,993
Total expenses 110,294 103,480 210,460 200,430
Operating income (loss) 21,274 4,277 27,207 13,029
Allowance for equity funds used during construction 696 514 1,338 957
Equity in earnings of subsidiaries 0 0 0 0
Retirement defined benefits credit (expense)—other than service costs (23) (22) (46) (44)
Interest expense and other charges, net (6,643) (3,892) (11,193) (7,696)
Allowance for borrowed funds used during construction 365 181 701 335
Interest income 43 39 84 126
Income before income taxes 15,712 1,097 18,091 6,707
Income tax expense 3,693 (99) 3,946 980
Net income   1,196 14,145 5,727
Preferred stock dividends of subsidiaries   95   190
Net income attributable to Hawaiian Electric   1,101   5,537
Preferred stock dividends of Hawaiian Electric   0   0
Net income for common stock 12,019 1,101 14,145 5,537
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric consolidated        
Condensed Income Statements, Captions [Line Items]        
Revenues 3,116 2,864 6,070 5,808
Expenses        
Fuel oil 0 0 0 0
Purchased power 0 0 0 0
Other operation and maintenance 971 1,562 1,918 2,226
Wildfire tort-related claims 0   0  
Depreciation 0 0 0 0
Taxes, other than income taxes 1 1 1 1
Total expenses 972 1,563 1,919 2,227
Operating income (loss) 2,144 1,301 4,151 3,581
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 before income taxes 2,144 1,301 4,151 3,581
Income tax expense 552 335 1,069 922
Net income   966 3,082 2,659
Preferred stock dividends of subsidiaries   0   0
Net income attributable to Hawaiian Electric   966   2,659
Preferred stock dividends of Hawaiian Electric   0   0
Net income for common stock $ 1,592 $ 966 $ 3,082 $ 2,659