v3.26.1
Electric utility segment - Schedule of Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Condensed Statement of Income Captions [Line Items]            
Net income for common stock $ 123,200   $ 26,085   $ 153,650 $ 52,756
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (457)   (508)   (915) (1,013)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes 436   484   872 967
Other comprehensive loss, net of tax benefits (75) $ (74) (306) $ (460) (149) (766)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 123,125   25,779   153,501 51,990
Hawaiian Electric consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income for common stock 137,858   39,150   173,201 86,966
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (483)   (531)   (966) (1,061)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes 436   484   872 967
Other comprehensive loss, net of tax benefits (47) $ (47) (47) $ (47) (94) (94)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 137,811   39,103   173,107 86,872
Consolidating adjustments | Hawaiian Electric consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income for common stock (28,962)   (7,767)   (36,136) (17,492)
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 102   88   207 182
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes (89)   (75)   (178) (151)
Other comprehensive loss, net of tax benefits 13   13   29 31
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (28,949)   (7,754)   (36,107) (17,461)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income for common stock 137,858   39,150   173,201 86,966
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (483)   (531)   (966) (1,061)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes 436   484   872 967
Other comprehensive loss, net of tax benefits (47)   (47)   (94) (94)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 137,811   39,103   173,107 86,872
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income for common stock 15,351   5,700   18,909 9,296
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (40)   (26)   (79) (55)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes 36   22   71 44
Other comprehensive loss, net of tax benefits (4)   (4)   (8) (11)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 15,347   5,696   18,901 9,285
Maui Electric | Reportable Legal Entities | Hawaiian Electric consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income for common stock 12,019   1,101   14,145 5,537
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes (62)   (62)   (128) (127)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes 53   53   107 107
Other comprehensive loss, net of tax benefits (9)   (9)   (21) (20)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 12,010   1,092   14,124 5,517
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric consolidated            
Condensed Statement of Income Captions [Line Items]            
Net income for common stock 1,592   966   3,082 2,659
Retirement benefit plans:            
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes 0   0   0 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes 0   0   0 0
Other comprehensive loss, net of tax benefits 0   0   0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 1,592   $ 966   $ 3,082 $ 2,659