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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