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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Condensed Income Statements, Captions [Line Items]                
Revenues $ 1,042,197     $ 756,904     $ 2,722,872 $ 2,080,107
Expenses                
Total expenses 940,082     659,588     2,434,813 1,782,904
Total operating income 102,115     97,316     288,059 297,203
Allowance for equity funds used during construction 2,552     2,427     7,431 6,995
Retirement defined benefits credit—other than service costs 1,039     1,058     3,528 4,709
Allowance for borrowed funds used during construction 825     827     2,401 2,386
Income before income taxes 79,905     78,151     233,602 241,291
Income taxes 17,352     14,265     48,395 48,229
Net income attributable to Hawaiian Electric 62,553     63,886     185,207 193,062
Preferred stock dividends of Hawaiian Electric 471     471     1,417 1,417
Net income for common stock 62,082 $ 52,541 $ 69,167 63,415 $ 63,872 $ 64,358 183,790 191,645
Consolidating adjustments                
Expenses                
Total expenses       0        
Hawaiian Electric Consolidated                
Condensed Income Statements, Captions [Line Items]                
Revenues 955,971     679,499     2,483,636 1,846,242
Expenses                
Fuel oil 383,602     180,682     874,543 447,245
Purchased power 225,209     185,759     606,827 490,520
Other operation and maintenance 121,110     116,468     371,259 349,180
Depreciation 58,711     57,386     175,921 172,122
Taxes, other than income taxes 88,290     64,012     231,288 175,185
Total expenses 876,922     604,307     2,259,838 1,634,252
Total operating income 79,049     75,192     223,798 211,990
Allowance for equity funds used during construction 2,552     2,427     7,431 6,995
Equity in earnings of subsidiaries 0     0     0 0
Retirement defined benefits credit—other than service costs 895     877     2,876 2,918
Interest expense and other charges, net (19,609)     (18,148)     (56,735) (54,126)
Allowance for borrowed funds used during construction 825     827     2,401 2,386
Income before income taxes 63,712     61,175     179,771 170,163
Income taxes 13,450     10,335     37,967 33,066
Net income 50,262     50,840     141,804 137,097
Preferred stock dividends of subsidiaries 228     228     686 686
Net income attributable to Hawaiian Electric 50,034     50,612     141,118 136,411
Preferred stock dividends of Hawaiian Electric 270     270     810 810
Net income for common stock 49,764 $ 44,135 $ 46,409 50,342 $ 41,901 $ 43,358 140,308 135,601
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric                
Condensed Income Statements, Captions [Line Items]                
Revenues 693,281     478,046     1,769,995 1,301,297
Expenses                
Fuel oil 280,447     126,909     619,169 306,982
Purchased power 171,470     136,688     460,855 370,240
Other operation and maintenance 77,115     75,191     243,478 230,429
Depreciation 39,474     38,912     118,459 116,733
Taxes, other than income taxes 64,051     45,239     165,350 124,167
Total expenses 632,557     422,939     1,607,311 1,148,551
Total operating income 60,724     55,107     162,684 152,746
Allowance for equity funds used during construction 2,063     1,999     5,999 5,677
Equity in earnings of subsidiaries 10,577     12,028     36,475 35,282
Retirement defined benefits credit—other than service costs 760     741     2,471 2,511
Interest expense and other charges, net (14,221)     (12,943)     (40,833) (38,604)
Allowance for borrowed funds used during construction 674     676     1,962 1,921
Income before income taxes 60,577     57,608     168,758 159,533
Income taxes 10,543     6,996     27,640 23,122
Net income 50,034     50,612     141,118 136,411
Preferred stock dividends of subsidiaries 0     0     0 0
Net income attributable to Hawaiian Electric 50,034     50,612     141,118 136,411
Preferred stock dividends of Hawaiian Electric 270     270     810 810
Net income for common stock 49,764     50,342     140,308 135,601
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light                
Condensed Income Statements, Captions [Line Items]                
Revenues 130,858     100,313     363,888 276,974
Expenses                
Fuel oil 40,540     21,104     98,856 57,175
Purchased power 37,263     31,159     106,710 76,992
Other operation and maintenance 21,882     19,964     63,427 57,350
Depreciation 10,350     10,050     31,053 30,151
Taxes, other than income taxes 12,026     9,333     33,436 25,865
Total expenses 122,061     91,610     333,482 247,533
Total operating income 8,797     8,703     30,406 29,441
Allowance for equity funds used during construction 206     131     616 403
Equity in earnings of subsidiaries 0     0     0 0
Retirement defined benefits credit—other than service costs 166     166     500 503
Interest expense and other charges, net (2,716)     (2,590)     (7,967) (7,744)
Allowance for borrowed funds used during construction 63     44     190 136
Income before income taxes 6,516     6,454     23,745 22,739
Income taxes 1,424     1,433     5,351 5,152
Net income 5,092     5,021     18,394 17,587
Preferred stock dividends of subsidiaries 133     133     400 400
Net income attributable to Hawaiian Electric 4,959     4,888     17,994 17,187
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income for common stock 4,959     4,888     17,994 17,187
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric                
Condensed Income Statements, Captions [Line Items]                
Revenues 131,910     101,141     349,866 267,992
Expenses                
Fuel oil 62,615     32,669     156,518 83,088
Purchased power 16,476     17,912     39,262 43,288
Other operation and maintenance 22,113     21,313     64,354 61,401
Depreciation 8,887     8,424     26,409 25,238
Taxes, other than income taxes 12,213     9,440     32,502 25,153
Total expenses 122,304     89,758     319,045 238,168
Total operating income 9,606     11,383     30,821 29,824
Allowance for equity funds used during construction 283     297     816 915
Equity in earnings of subsidiaries 0     0     0 0
Retirement defined benefits credit—other than service costs (31)     (30)     (95) (96)
Interest expense and other charges, net (2,750)     (2,616)     (8,048) (7,799)
Allowance for borrowed funds used during construction 88     107     249 329
Income before income taxes 7,196     9,141     23,743 23,173
Income taxes 1,483     1,906     4,976 4,792
Net income 5,713     7,235     18,767 18,381
Preferred stock dividends of subsidiaries 95     95     286 286
Net income attributable to Hawaiian Electric 5,618     7,140     18,481 18,095
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income for common stock 5,618     7,140     18,481 18,095
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries                
Condensed Income Statements, Captions [Line Items]                
Revenues 0     0     0 0
Expenses                
Fuel oil 0     0     0 0
Purchased power 0     0     0 0
Other operation and maintenance 0     0     0 0
Depreciation 0     0     0 0
Taxes, other than income taxes 0     0     0 0
Total expenses 0     0     0 0
Total operating income 0     0     0 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—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
Income before income taxes 0     0     0 0
Income taxes 0     0     0 0
Net income 0     0     0 0
Preferred stock dividends of subsidiaries 0     0     0 0
Net income attributable to Hawaiian Electric 0     0     0 0
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income for common stock 0     0     0 0
Hawaiian Electric Consolidated | Consolidating adjustments                
Condensed Income Statements, Captions [Line Items]                
Revenues (78)     (1)     (113) (21)
Expenses                
Fuel oil 0     0     0 0
Purchased power 0     0     0 0
Other operation and maintenance 0     0     0 0
Depreciation 0     0     0 0
Taxes, other than income taxes 0     0     0 0
Total expenses 0           0 0
Total operating income (78)     (1)     (113) (21)
Allowance for equity funds used during construction 0     0     0 0
Equity in earnings of subsidiaries (10,577)     (12,028)     (36,475) (35,282)
Retirement defined benefits credit—other than service costs 0     0     0 0
Interest expense and other charges, net 78     1     113 21
Allowance for borrowed funds used during construction 0     0     0 0
Income before income taxes (10,577)     (12,028)     (36,475) (35,282)
Income taxes 0     0     0 0
Net income (10,577)     (12,028)     (36,475) (35,282)
Preferred stock dividends of subsidiaries 0     0     0 0
Net income attributable to Hawaiian Electric (10,577)     (12,028)     (36,475) (35,282)
Preferred stock dividends of Hawaiian Electric 0     0     0 0
Net income for common stock $ (10,577)     $ (12,028)     $ (36,475) $ (35,282)