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Electric utility segment - Condensed Consolidating Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Condensed Income Statements, Captions [Line Items]                
Revenues $ 938,383     $ 901,873     $ 2,732,901 $ 2,725,795
Expenses                
Total expenses 1,064,931     826,762     4,502,005 2,464,187
Total operating income (loss) (126,548)     75,111     (1,769,104) 261,608
Allowance for equity funds used during construction 3,300     4,000     10,276 11,073
Retirement defined benefits credit (expense)—other than service costs 1,106     1,256     3,669 3,561
Allowance for borrowed funds used during construction 1,331     1,372     4,061 3,798
Interest income 3,662     0     9,929 0
Income (loss) before income taxes (149,234)     49,110     (1,837,245) 188,781
Income tax expense (benefit) (45,303)     7,521     (480,898) 36,915
Net income (loss) (103,931)     41,589     (1,356,347) 151,866
Preferred stock dividends of Hawaiian Electric 471     471     1,417 1,417
Net income (loss) for common stock (104,402) $ (1,295,484) $ 42,122 41,118 $ 54,610 $ 54,721 (1,357,764) 150,449
Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues 829,617     794,987     2,410,526 2,419,539
Expenses                
Fuel oil 279,038     267,438     821,986 881,692
Purchased power 189,165     177,795     530,310 498,990
Other operation and maintenance 162,197     142,508     453,648 407,184
Wildfire tort-related claims 163,000     0     1,875,000 0
Depreciation 62,812     61,165     188,436 182,781
Taxes, other than income taxes 77,969     74,723     226,795 228,034
Total expenses 934,181     723,629     4,096,175 2,198,681
Total operating income (loss) (104,564)     71,358     (1,685,649) 220,858
Allowance for equity funds used during construction 3,300     4,000     10,276 11,073
Equity in earnings of subsidiaries 0     0     0 0
Retirement defined benefits credit (expense)—other than service costs 959     1,132     3,103 3,227
Interest expense and other charges, net (20,223)     (22,447)     (61,625) (63,565)
Allowance for borrowed funds used during construction 1,331     1,372     4,061 3,798
Interest income 1,671     0     4,555 0
Income (loss) before income taxes (117,526)     55,415     (1,725,279) 175,391
Income tax expense (benefit) (35,439)     11,456     (454,017) 38,126
Net income (loss) (82,087)     43,959     (1,271,262) 137,265
Preferred stock dividends of subsidiaries 228     228     686 686
Net income (loss) (82,315)     43,731     (1,271,948) 136,579
Preferred stock dividends of Hawaiian Electric 270     270     810 810
Net income (loss) for common stock (82,585) $ (1,229,394) $ 39,221 43,461 $ 45,299 $ 47,009 (1,272,758) 135,769
Reportable Legal Entities | Hawaiian Electric Consolidated                
Expenses                
Interest income             4,555  
Consolidating adjustments | Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues (2,647)     0     (2,647) (130)
Expenses                
Fuel oil 0     0     0 0
Purchased power 0     0     0 0
Other operation and maintenance (2,647)     0     (2,647) 0
Wildfire tort-related claims 0           0  
Depreciation 0     0     0 0
Taxes, other than income taxes 0     0     0 0
Total expenses (2,647)     0     (2,647) 0
Total operating income (loss) 0     0     0 (130)
Allowance for equity funds used during construction 0     0     0 0
Equity in earnings of subsidiaries 18,558     (3,005)     258,633 (25,960)
Retirement defined benefits credit (expense)—other than service costs 0     0     0 0
Interest expense and other charges, net 1,731     0     5,016 130
Allowance for borrowed funds used during construction 0     0     0 0
Interest income (1,731)           (5,016)  
Income (loss) before income taxes 18,558     (3,005)     258,633 (25,960)
Income tax expense (benefit) 0     0     0 0
Net income (loss) 18,558     (3,005)     258,633 (25,960)
Preferred stock dividends of subsidiaries 0     0     0 0
Net income (loss) 18,558     (3,005)     258,633 (25,960)
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income (loss) for common stock 18,558     (3,005)     258,633 (25,960)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues 592,784     570,323     1,721,592 1,742,542
Expenses                
Fuel oil 207,498     196,223     605,083 663,521
Purchased power 135,645     132,536     390,302 362,275
Other operation and maintenance 105,977     83,528     290,578 255,728
Wildfire tort-related claims 130,400           1,500,000  
Depreciation 42,004     41,276     126,011 123,114
Taxes, other than income taxes 55,787     53,511     162,410 164,510
Total expenses 677,311     507,074     3,074,384 1,569,148
Total operating income (loss) (84,527)     63,249     (1,352,792) 173,394
Allowance for equity funds used during construction 2,628     3,005     8,027 8,604
Equity in earnings of subsidiaries (18,558)     3,005     (258,633) 25,960
Retirement defined benefits credit (expense)—other than service costs 826     992     2,681 2,801
Interest expense and other charges, net (14,870)     (16,295)     (44,879) (45,594)
Allowance for borrowed funds used during construction 1,055     1,047     3,168 2,995
Interest income 2,971           8,606  
Income (loss) before income taxes (110,475)     55,003     (1,633,822) 168,160
Income tax expense (benefit) (28,160)     11,272     (361,874) 31,581
Net income (loss) (82,315)     43,731     (1,271,948) 136,579
Preferred stock dividends of subsidiaries 0     0     0 0
Net income (loss) (82,315)     43,731     (1,271,948) 136,579
Preferred stock dividends of Hawaiian Electric 270     270     810 810
Net income (loss) for common stock (82,585)     43,461     (1,272,758) 135,769
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues 123,238     116,192     358,510 343,554
Expenses                
Fuel oil 31,464     30,956     91,590 79,187
Purchased power 35,291     30,265     98,415 101,597
Other operation and maintenance 25,614     21,351     74,748 64,367
Wildfire tort-related claims 16,300           187,500  
Depreciation 10,964     10,635     32,892 31,906
Taxes, other than income taxes 11,511     10,857     33,411 31,983
Total expenses 131,144     104,064     518,556 309,040
Total operating income (loss) (7,906)     12,128     (160,046) 34,514
Allowance for equity funds used during construction 256     366     893 1,004
Equity in earnings of subsidiaries 0     0     0 0
Retirement defined benefits credit (expense)—other than service costs 162     163     498 500
Interest expense and other charges, net (2,760)     (2,988)     (8,648) (8,794)
Allowance for borrowed funds used during construction 75     117     267 321
Interest income 324           720  
Income (loss) before income taxes (9,849)     9,786     (166,316) 27,545
Income tax expense (benefit) (2,807)     2,234     (43,636) 6,261
Net income (loss) (7,042)     7,552     (122,680) 21,284
Preferred stock dividends of subsidiaries 133     133     400 400
Net income (loss) (7,175)     7,419     (123,080) 20,884
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income (loss) for common stock (7,175)     7,419     (123,080) 20,884
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues 113,840     108,472     330,669 333,573
Expenses                
Fuel oil 40,076     40,259     125,313 138,984
Purchased power 18,229     14,994     41,593 35,118
Other operation and maintenance 32,769     37,629     90,485 87,089
Wildfire tort-related claims 16,300           187,500  
Depreciation 9,844     9,254     29,533 27,761
Taxes, other than income taxes 10,671     10,355     30,974 31,541
Total expenses 127,889     112,491     505,398 320,493
Total operating income (loss) (14,049)     (4,019)     (174,729) 13,080
Allowance for equity funds used during construction 416     629     1,356 1,465
Equity in earnings of subsidiaries 0     0     0 0
Retirement defined benefits credit (expense)—other than service costs (29)     (23)     (76) (74)
Interest expense and other charges, net (4,324)     (3,164)     (13,114) (9,307)
Allowance for borrowed funds used during construction 201     208     626 482
Interest income 107           245  
Income (loss) before income taxes (17,678)     (6,369)     (185,692) 5,646
Income tax expense (benefit) (4,966)     (2,050)     (49,001) 284
Net income (loss) (12,712)     (4,319)     (136,691) 5,362
Preferred stock dividends of subsidiaries 95     95     286 286
Net income (loss) (12,807)     (4,414)     (136,977) 5,076
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income (loss) for common stock (12,807)     (4,414)     (136,977) 5,076
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues 2,402     0     2,402 0
Expenses                
Fuel oil 0     0     0 0
Purchased power 0     0     0 0
Other operation and maintenance 484     0     484 0
Wildfire tort-related claims 0           0  
Depreciation 0     0     0 0
Taxes, other than income taxes 0     0     0 0
Total expenses 484     0     484 0
Total operating income (loss) 1,918     0     1,918 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              
Income (loss) before income taxes 1,918     0     1,918 0
Income tax expense (benefit) 494     0     494 0
Net income (loss) 1,424     0     1,424 0
Preferred stock dividends of subsidiaries 0     0     0 0
Net income (loss) 1,424     0     1,424 0
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income (loss) for common stock $ 1,424     $ 0     1,424 $ 0
Other subsidiaries | Consolidating adjustments | Hawaiian Electric Consolidated                
Expenses                
Interest income             $ 0