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Nature of the business, Assets acquired (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Aug. 02, 2019
USD ($)
MW
Corporation
May 24, 2019
USD ($)
MW
May 09, 2019
USD ($)
MW
Jan. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
MW
Dec. 11, 2018
USD ($)
kV
Feb. 28, 2018
USD ($)
MW
Oct. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 28, 2018
USD ($)
Oct. 10, 2018
USD ($)
Nature of the business [Abstract]                        
Investments carried under the equity method                 $ 140,585 $ 53,419    
Befesa Agua Tenes, S.L.U. [Member]                        
Nature of the business [Abstract]                        
Ownership interest       51.00%                
Equity value of agreed price       $ 24,500                
Consideration payment advanced       $ 19,900                
Interest rate       12.00%                
Befesa Agua Tenes, S.L.U. [Member] | Subsequent Events [Member]                        
Nature of the business [Abstract]                        
Payment received through cash sweep mechanism               $ 7,800        
Monterrey [Member]                        
Nature of the business [Abstract]                        
Percentage interest acquired 30.00%                      
Gross capacity | MW 142                      
Acquisition purchase price $ 42,000                      
Ownership percentage acquired 30.00%                      
Installed capacity | MW 130                      
Battery capacity | MW 12                      
Period of PPA 20 years                      
Number of international corporations | Corporation 2                      
Ownership percentage to be acquired under ROFO agreement 70.00%                      
Investments carried under the equity method $ 17,000                      
Amherst Island [Member]                        
Nature of the business [Abstract]                        
Gross capacity | MW   75                    
Installed capacity | MW     75                  
Investments carried under the equity method   $ 4,900 $ 4,900                  
ASI Operations LLC [Member]                        
Nature of the business [Abstract]                        
Acquisition purchase price 6,000                      
Investments carried under the equity method $ 6,000                      
Chile TL3 [Member]                        
Nature of the business [Abstract]                        
Gross capacity | kV           66            
Acquisition purchase price           $ 6,000            
Ownership interest                 100.00%      
ATN [Member]                        
Nature of the business [Abstract]                        
Acquisition purchase price                     $ 16,000  
Ownership interest [1]                 100.00%      
Melowind [Member]                        
Nature of the business [Abstract]                        
Percentage interest acquired         100.00%              
Gross capacity | MW         50              
Acquisition purchase price         $ 45,000              
Ownership interest                 100.00%      
Mini- Hydro [Member]                        
Nature of the business [Abstract]                        
Percentage interest acquired             100.00%          
Gross capacity | MW             4          
Acquisition purchase price             $ 9,000          
Ownership interest                 100.00%      
PTS [Member]                        
Nature of the business [Abstract]                        
Percentage interest acquired                       5.00%
Acquisition purchase price                       $ 7,000
[1] Including the acquisition of ATN expansion 1.