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Intangible assets and goodwill - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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

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