SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation and qualifying accounts
Bad debt expenses deferred to regulatory assets	$ 300	$ 2,700	$ 16,200
Allowance for uncollectible accounts – electric utility | Hawaiian Electric Company, Inc. and Subsidiaries
Valuation and qualifying accounts
Balance at beginning of period	4,560	6,111	26,100
Charged to costs and expenses	4,721	8,161	6,028
Charged to other accounts	1,965	(665)	(14,626)
Deductions	5,684	9,047	11,391
Balance at end of period	$ 5,562	$ 4,560	$ 6,111