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Credit agreement and changes in debt - HEI private placement (Details) - Senior Notes	Sep. 30, 2022 USD ($)
HEI Series 2022C
Debt Instrument [Line Items]
Aggregate principal amount	$ 75,000,000
Fixed coupon interest rate	5.43%
HEI Green Series 2022D
Debt Instrument [Line Items]
Aggregate principal amount	$ 35,000,000
Fixed coupon interest rate	5.43%

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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