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v3.23.1

Credit agreement and changes in debt - Note purchase agreements (Details) - Senior Notes - USD ($) | Mar. 31, 2023 | Jan. 10, 2023
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Series 2023A |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 39,000,000 |
Fixed coupon interest rate | 6.04% |
Series 2023A | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 90,000,000
Series 2023A | Hawaiian Electric, Parent |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 40,000,000
Fixed coupon interest rate |  | 6.11%
Series 2023A | Hawaii Electric Light Company, Inc |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 25,000,000
Fixed coupon interest rate |  | 6.25%
Series 2023A | Maui Electric |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 25,000,000
Fixed coupon interest rate |  | 6.25%
Series 2023B |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 61,000,000 |
Fixed coupon interest rate | 6.10% |
Series 2023B | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 40,000,000
Series 2023B | Hawaiian Electric, Parent |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 40,000,000
Fixed coupon interest rate |  | 6.25%
Series 2023C | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 20,000,000
Series 2023C | Hawaiian Electric, Parent |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 20,000,000
Fixed coupon interest rate |  | 6.70%

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