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Long-term debt - Narrative (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 29, 2021 USD ($) | Sep. 03, 2021 USD ($) project | Nov. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 29, 2021 USD ($) tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | $ 285,886,000 | $ 415,997,000 | $ 289,349,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | $ 115,000,000 | $ 255,000,000 | $ 280,000,000 |
Equity capitalization ratio |  |  |  |  |  |  |  | 58.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Refinancing portion of debt |  |  | $ 150,000,000 |  |  |  |  |
Senior notes | HEI Series 2020A |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 125,000,000
Number of tranches | tranche |  |  |  |  |  |  |  | 2
Proceeds from issuance of long-term debt | $ 75,000,000 |  |  |  |  |  |  |
Proceeds from debt on delayed basis | $ 50,000,000 |  |  |  |  |  |  |
Senior notes | HEI Series 2020A | Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Refinancing portion of debt |  |  |  | $ 50,000,000 |  |  |  |
Term loan | Mauo Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 24,000,000 |  |  |  |  |  |
Aggregate amount of debt |  | $ 13,000,000 |  |  |  |  |  |
Number of solar-battery projects | project |  | 5 |  |  |  |  |  |
Number of solar-battery projects collateralized | project |  | 3 |  |  |  |  |  |
Fixed coupon interest rate |  | 4.90% |  |  |  |  |  |
Term loan | Mauo Credit Agreement | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility basis point spread |  | 1.70% |  |  |  |  |  |

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