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Credit agreements and changes in debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Note Purchase Agreements
On May 14, 2020, the Utilities issued, through a private placement pursuant to separate Note Purchase Agreements (the Note Purchase Agreements), the following unsecured senior notes bearing taxable interest (the Notes):
Series 2020ASeries 2020BSeries 2020C
Aggregate principal amount
$80 million$60 million$20 million
Fixed coupon interest rate
Hawaiian Electric3.31%3.31%3.96%
Hawaii Electric Light3.96%
Maui Electric3.31%3.96%
Maturity date
Hawaiian Electric5/1/20305/1/20305/1/2050
Hawaii Electric Light5/1/2050
Maui Electric5/1/20305/1/2050
Principal amount by company:
     Hawaiian Electric
$50 million
(Green Bond)
$40 million$20 million
     Hawaii Electric Light$10 million— —
     Maui Electric$20 million20 million—