SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation and qualifying accounts
Bad debt expenses deferred to regulatory assets	$ 10,700	$ 16,700
Bill credits	2,000
Allowance for uncollectible accounts – electric utility | Hawaiian Electric Company, Inc. and Subsidiaries
Valuation and qualifying accounts
Balance at begin- ning of period	17,809	1,377	$ 1,480
Charged to costs and expenses	4,183	2,100	2,106
Charged to other accounts	11,795	18,041	795
Deductions	7,687	3,709	3,004
Balance at end of period	$ 26,100	$ 17,809	$ 1,377