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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Valuation and qualifying accounts      
Bad debt expenses deferred to regulatory assets $ 16,200 $ 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 26,100 17,809 1,377
Charged to costs and expenses 6,028 4,183 2,100
Charged to other accounts (14,626) 11,795 18,041
Deductions 11,391 7,687 3,709
Balance at end of period $ 6,111 $ 26,100 $ 17,809