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Intangible assets and goodwill - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Cost $ 162,292 $ 168,522
Accumulated amortization 57,176 53,609
Net book value 105,116 114,913
Power sales contracts    
Finite-Lived Intangible Assets [Line Items]    
Cost 58,112 57,943
Accumulated amortization 43,118 41,184
Net book value 14,994 16,759
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Cost 78,140 83,342
Accumulated amortization 12,337 10,967
Net book value 65,803 72,375
Interconnection agreements    
Finite-Lived Intangible Assets [Line Items]    
Cost 15,072 15,028
Accumulated amortization 1,721 1,458
Net book value 13,351 13,570
Other    
Finite-Lived Intangible Assets [Line Items]    
Cost 10,968 12,209
Accumulated amortization 0 0
Net book value $ 10,968 $ 12,209