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Income taxes - Schedule of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]    
Expected income tax expense (recovery) at Canadian statutory rate $ 46,953 $ (17,305)
Increase (decrease) resulting from:    
Effect of differences in tax rates on transactions in and within foreign jurisdictions and change in tax rates (17,676) (35,776)
Investment in Atlantica (8,207) 16,997
Non-controlling interests share of income 19,757 10,016
Change in valuation allowance 154,601 (388)
Adjustment relating to prior periods 2,794 (1,412)
Amortization and settlement of excess deferred income tax (14,540) (12,785)
Deferred income taxes on regulated income recorded as regulatory assets (2,380) (878)
Other 5,495 4,476
Total $ 186,797 $ (37,055)