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Electric utility segment - Condensed Consolidating Statement of Changes in Common Stock Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Increase (decrease) in stockholders' equity
Beginning balance	$ 1,479,089	$ 2,344,841
Net income for common stock	26,671	42,122
Other comprehensive loss, net of taxes	(460)	(9,801)
Ending balance	1,505,876	2,377,380
Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	1,156,955	2,409,110
Net income for common stock	47,816	39,221
Other comprehensive loss, net of taxes	(47)	(49)
Common stock dividends		(13,000)
Additional paid-in capital	287,520
Ending balance	1,492,244	2,435,282
Consolidating adjustments | Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	(680,414)	(722,211)
Net income for common stock	(9,725)	(6,024)
Other comprehensive loss, net of taxes	18	13
Additional paid-in capital	(228)
Ending balance	(690,349)	(728,222)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	1,156,955	2,409,110
Net income for common stock	47,816	39,221
Other comprehensive loss, net of taxes	(47)	(49)
Common stock dividends		(13,000)
Additional paid-in capital	287,520
Ending balance	1,492,244	2,435,282
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	243,964	359,790
Net income for common stock	3,596	4,390
Other comprehensive loss, net of taxes	(7)	(3)
Additional paid-in capital	133
Ending balance	247,686	364,177
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	282,876	362,344
Net income for common stock	4,436	1,634
Other comprehensive loss, net of taxes	(11)	(10)
Additional paid-in capital	95
Ending balance	287,396	363,968
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated
Increase (decrease) in stockholders' equity
Beginning balance	153,574	77
Net income for common stock	1,693	0
Other comprehensive loss, net of taxes	0	0
Ending balance	$ 155,267	$ 77

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