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Long-term investments - Investments in Significant Partnerships and Joint Ventures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets $ 18,373,961 $ 17,627,613  
AQN's investment carrying amount for the entities 456,393 381,802  
Income Statement [Abstract]      
Revenue 2,698,015 2,765,013  
Net loss (33,305) (308,155)  
OCI 58,794 (90,036)  
Investments in Significant Partnerships and Joint Ventures      
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 3,235,474 2,740,132  
Total liabilities 1,962,115 1,507,079  
Net assets 1,273,359 1,233,053  
Income Statement [Abstract]      
Revenue 111,446 65,025  
Net loss (3,633) (31,070)  
OCI 12,026 (130,729)  
Investments in Significant Partnerships and Joint Ventures | APUC      
Income Statement [Abstract]      
Net loss (5,936) (21,416)  
OCI 7,693 (67,110)  
Investments in Significant Partnerships and Joint Ventures      
Equity Method Investment, Summarized Financial Information [Abstract]      
AQN's investment carrying amount for the entities 456,393 381,802 $ 433,850
Investments in Significant Partnerships and Joint Ventures | APUC      
Equity Method Investment, Summarized Financial Information [Abstract]      
AQN's ownership interest in the entities 388,993 332,663  
Difference between investment carrying amount and underlying equity in net assets 67,400 49,139  
AQN's investment carrying amount for the entities $ 456,393 $ 381,802