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Long-term investments - Investments in Significant Partnerships and Joint Ventures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets $ 17,627,613 $ 16,797,503  
AQN's investment carrying amount for the entities 381,802 433,850  
Long-term debt 7,512,017 6,211,375  
Income Statement [Abstract]      
Revenue 2,765,155 2,274,142  
Net loss (308,155) 185,657  
Other comprehensive loss (90,036) (42,550)  
Investments in Significant Partnerships and Joint Ventures      
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 2,740,132 2,126,934  
Total liabilities 1,507,079 945,971  
Net assets 1,233,053 1,180,963  
Income Statement [Abstract]      
Revenue 65,025 20,262  
Net loss (31,070) (46,293)  
Other comprehensive loss (130,729) 15,177  
Investments in Significant Partnerships and Joint Ventures | APUC      
Income Statement [Abstract]      
Net loss (21,416) (26,337)  
Other comprehensive loss (67,110) 7,733  
Investments in Significant Partnerships and Joint Ventures      
Equity Method Investment, Summarized Financial Information [Abstract]      
AQN's investment carrying amount for the entities 381,802 433,850 $ 186,452
Investments in Significant Partnerships and Joint Ventures | APUC      
Equity Method Investment, Summarized Financial Information [Abstract]      
AQN's ownership interest in the entities 332,663 327,555  
Difference between investment carrying amount and underlying equity in net assets 49,139 106,295  
AQN's investment carrying amount for the entities $ 381,802 $ 433,850