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Condensed Consolidated Statements of Comprehensive Income (unaudited) - HECO - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income (loss) for common stock $ 30,747     $ (104,402)     $ 83,503 $ (1,357,764)
Retirement benefit plans:                
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes of $(200), $(462), $(568) and $(813), respectively (540)     (1,244)     (1,553) (2,138)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $192, $462, $527 and $781, respectively 552     1,333     1,519 2,251
Other comprehensive income (loss), net of taxes (734) $ (306) $ (460) 39,360 $ 1,594 $ (9,801) (1,500) 31,153
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. 30,013     (65,042)     82,003 (1,326,611)
Hawaiian Electric Company, Inc. and Subsidiaries                
Net income (loss) for common stock 36,988     (82,585)     123,954 (1,272,758)
Retirement benefit plans:                
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes of $(200), $(462), $(568) and $(813), respectively (576)     (1,331)     (1,637) (2,344)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $192, $462, $527 and $781, respectively 552     1,333     1,519 2,251
Other comprehensive income (loss), net of taxes (24) $ (47) $ (47) 2 $ (46) $ (49) (118) (93)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. $ 36,964     $ (82,583)     $ 123,836 $ (1,272,851)