Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Total revenues	$ 3,219,850	$ 3,287,503	$ 3,420,917
Expenses
Total expenses	4,926,610	3,012,511	3,141,362
Operating income (loss)
Operating income (loss)	(1,706,760)	274,992	279,555
Retirement defined benefits credit—other than service costs	3,754	4,014	3,688
Interest expense, net	(127,207)	(125,532)	(103,402)
Allowance for borrowed funds used during construction	5,470	5,201	3,416
Allowance for equity funds used during construction	13,786	15,164	10,574
Interest income	19,362	9,105	0
Gain (loss) on sales of equity-method investments	0	(644)	8,123
Income (loss) from continuing operations before income taxes	(1,791,595)	182,300	201,954
Income tax expense (benefit)	(470,962)	34,534	38,915
Income (loss) from continuing operations	(1,320,633)	147,766	163,039
Preferred stock dividends of Hawaiian Electric	1,890	1,890	1,890
Income (loss) from continuing operations for common stock	(1,322,523)	145,876	161,149
Income (loss) from discontinued operations	(103,486)	53,362	79,989
Net income (loss) for common stock	$ (1,426,009)	$ 199,238	$ 241,138
Continuing operations - Basic earnings (loss) per common share (in dollars per share)	$ (10.42)	$ 1.33	$ 1.47
Discontinued operations - Basic earnings (loss) per common share (in dollars per share)	(0.81)	0.49	0.73
Basic earnings (loss) per common share (in dollars per share)	(11.23)	1.82	2.20
Continuing operations - Diluted earnings (loss) per common share (in dollars per share)	(10.42)	1.33	1.47
Discontinued operations - Diluted earnings (loss) per common share (in dollars per share)	(0.81)	0.48	0.73
Diluted earnings (loss) per common share (in dollars per share)	$ (11.23)	$ 1.81	$ 2.20
Weighted-average number of common shares outstanding (in shares)	126,927	109,739	109,434
Net effect of potentially dilutive shares (share-based compensation programs) (in shares)	0	299	344
Weighted-average shares assuming dilution (in shares)	126,927	110,038	109,778
Operating Segments
Revenues
Total revenues			$ 3,420,917
Other
Revenues
Total revenues	$ 13,150	$ 17,982	12,330
Expenses
Total expenses	108,052	45,148	31,966
Operating income (loss)
Operating income (loss)	(94,902)	(27,166)	(19,636)
Interest expense, net	(45,125)	(39,392)	(26,986)
Interest income	12,729	2,651
Income (loss) from continuing operations before income taxes	(127,681)	(64,840)	(38,646)
Income tax expense (benefit)	(31,415)	(16,659)	(10,761)
Income (loss) from continuing operations	(96,266)	(48,181)	(27,885)
Preferred stock dividends of Hawaiian Electric	(105)	(105)	(105)
Income (loss) from continuing operations for common stock	(96,161)	(48,076)	(27,780)
Electric utility
Revenues
Total revenues			3,408,583
Electric utility | Operating Segments
Revenues
Total revenues	3,206,700	3,269,521	3,408,587
Expenses
Total expenses	4,818,558	2,967,363	3,109,396
Operating income (loss)
Operating income (loss)	(1,611,858)	302,158	299,191
Interest expense, net	(82,082)	(86,140)	(76,416)
Interest income	6,633	6,454
Income (loss) from continuing operations before income taxes	(1,663,914)	247,140	240,600
Income tax expense (benefit)	(439,547)	51,193	49,676
Income (loss) from continuing operations	(1,224,367)	195,947	190,924
Preferred stock dividends of Hawaiian Electric	1,995	1,995	1,995
Income (loss) from continuing operations for common stock	$ (1,226,362)	$ 193,952	$ 188,929