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v3.22.4

Long-term debt - Changes in Long-term Debt (Details) - Senior notes | Dec. 31, 2022 USD ($)
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HEI Series 2022A |
Debt Instrument [Line Items] |
Aggregate principal amount | $ 30,000,000
Fixed coupon interest rate | 2.98%
HEI Series 2022B |
Debt Instrument [Line Items] |
Aggregate principal amount | $ 20,000,000
Fixed coupon interest rate | 3.94%
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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