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Credit agreement and changes in debt (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Notes
HEI Series 2023AHEI Series 2023B
Aggregate principal amount
$39 million$61 million
Fixed coupon interest rate
6.04%6.10%
Maturity date6/15/20286/15/2033
Series 2023ASeries 2023BSeries 2023C
Aggregate principal amount$90 million$40 million$20 million
Fixed coupon interest rate
Hawaiian Electric6.11%6.25%6.70%
Hawaii Electric Light6.25%——
Maui Electric6.25%——
Maturity date
Hawaiian Electric2/9/20302/9/20332/9/2053
Hawaii Electric Light2/9/2033——
Maui Electric2/9/2033——
Principal amount by company
Hawaiian Electric $40 million$40 million$20 million
Hawaii Electric Light$25 million——
Maui Electric$25 million——