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Business acquisition - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 15, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Business Acquisition [Line Items] |  |  |  |  |
Kentucky termination costs |  | $ 43,808 | $ 3,535 | $ 46,527 | $ 4,075
Kentucky Power Company and AEP Kentucky Transmission Company, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Kentucky termination costs |  | $ 43,808 |  | $ 46,527 |
Deerfield II Wind Facility |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership interest acquired (percent) | 50.00% |  |  |  |
Total purchase price | $ 23,142 |  |  |  |
Tax equity funding | 98,955 |  |  |  |
Debt repaid upon maturity | $ 158,550 |  |  |  |

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