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Credit agreements and changes in debt - Narrative (Details) |  |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2024 USD ($) payment | May 17, 2024 USD ($) extensionOption | May 14, 2023 USD ($) institution extensionOption | Feb. 18, 2022 USD ($) extensionOption | Sep. 30, 2024 USD ($) | Jun. 27, 2024 USD ($) | Dec. 08, 2023 USD ($) | Aug. 23, 2023 USD ($) | May 14, 2021 USD ($) institution
Mahipapa |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Number of deferred payments | payment | 2 |  |  |  |  |  |  |  |
Deferred payments | $ 3,000,000 |  |  |  |  |  |  |  |
Credit Facilities | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Number of financial institutions | institution |  |  | 9 |  |  |  |  |  | 9
Number of financial institutions with extended termination date | institution |  |  | 8 |  |  |  |  |  |
HEI Facility |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Credit agreement |  |  | $ 175,000,000 |  |  |  |  | $ 175,000,000 | $ 175,000,000
Credit agreement, remaining borrowing capacity |  |  | 157,000,000 |  |  |  |  |  |
Hawaiian Electric Facility |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Credit agreement |  |  | 200,000,000 |  |  |  |  |  |
Credit agreement, remaining borrowing capacity |  |  | $ 180,000,000 |  |  |  |  |  |
Hawaiian Electric Facility | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  | $ 275,000,000 |  |  |  | $ 200,000,000 | $ 200,000,000
Number of extension options | extensionOption |  |  | 2 | 2 |  |  |  |  |
Extension period |  |  | 1 year | 1 year |  |  |  |  |
Hawaiian Electric Facility | Hawaiian Electric Company, Inc. and Subsidiaries | Letter of Credit |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  | $ 75,000,000 |  |
ABL Credit Facility Agreement | Hawaiian Electric Company, Inc. and Subsidiaries | Revolving Credit Facility | Line of credit facility |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Credit agreement |  | $ 250,000,000 |  |  |  |  |  |  |
Number of extension options | extensionOption |  | 3 |  |  |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |  |  |
Credit facility period |  | 364 days |  |  |  |  |  |  |
Automatic extension expiration period |  | 3 years |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  | $ 250,000,000 |  |  |
Draw down of debt |  |  |  |  | $ 90,000,000 |  |  |  |

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