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Intangible assets and goodwill - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Cost $ 155,985 $ 155,212
Accumulated amortization 62,047 58,529
Net book value 93,938 96,683
Power sales contracts    
Finite-Lived Intangible Assets [Line Items]    
Cost 58,200 56,926
Accumulated amortization 43,938 42,818
Net book value 14,262 14,108
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Cost 77,104 77,850
Accumulated amortization 14,625 13,709
Net book value 62,479 64,141
Interconnection agreements    
Finite-Lived Intangible Assets [Line Items]    
Cost 10,329 10,098
Accumulated amortization 1,977 1,851
Net book value 8,352 8,247
Other    
Finite-Lived Intangible Assets [Line Items]    
Cost 10,352 10,338
Accumulated amortization 1,507 151
Net book value $ 8,845 $ 10,187