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Intangible assets and goodwill - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Cost $ 155,212 $ 162,292
Accumulated amortization 58,529 57,176
Net book value 96,683 105,116
Power sales contracts    
Finite-Lived Intangible Assets [Line Items]    
Cost 56,926 58,112
Accumulated amortization 42,818 43,118
Net book value 14,108 14,994
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Cost 77,850 78,140
Accumulated amortization 13,709 12,337
Net book value 64,141 65,803
Interconnection agreements    
Finite-Lived Intangible Assets [Line Items]    
Cost 10,098 15,072
Accumulated amortization 1,851 1,721
Net book value 8,247 13,351
Other    
Finite-Lived Intangible Assets [Line Items]    
Cost 10,338 10,968
Accumulated amortization 151 0
Net book value $ 10,187 $ 10,968