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Business acquisitions and development projects (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 01, 2022
USD ($)
Oct. 26, 2021
USD ($)
MWac
Nov. 09, 2020
USD ($)
Oct. 17, 2020
USD ($)
Oct. 13, 2020
USD ($)
Apr. 30, 2021
USD ($)
MWac
Jan. 31, 2021
USD ($)
Jan. 31, 2021
USD ($)
Jan. 31, 2021
USD ($)
MWac
Jan. 31, 2021
USD ($)
windProject
Jan. 31, 2021
USD ($)
businessUnit
Dec. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
MWac
windProject
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Net assets acquired, net of cash and cash equivalents                              
Goodwill (note 6)                       $ 1,201,244 $ 1,031,696   $ 1,208,390
Number of wind projects | windProject                         3    
Business combination, consideration transferred, liabilities incurred             $ 87,035                
New York Water Company, Inc | Subsequent Event                              
Business Acquisition [Line Items]                              
Total purchase price $ 608,000                            
Kentucky Power Company                              
Net assets acquired, net of cash and cash equivalents                              
Equity interest (percent)   50.00%                          
Wind power capacity (megawatt AC) | MWac   780                          
Business combination, termination fee   $ 65,000                          
Kentucky Power Transaction                              
Business Acquisition [Line Items]                              
Total purchase price   2,846,000                          
AEP Kentucky Transmission Company, Inc                              
Business Acquisition [Line Items]                              
Total purchase price   $ 1,221,000                          
Mid-West Wind Facilities                              
Net assets acquired, net of cash and cash equivalents                              
Working capital                       (28,630)      
Property, plant and equipment                       1,141,884      
Long-term debt                       (789,804)      
Asset retirement obligation                       (27,053)      
Deferred tax liability                       (4,566)      
Other liabilities                       (104,129)      
Non-controlling interest (tax equity investors)                       (29,141)      
Total net assets acquired                       158,561      
Cash and cash equivalents                       15,860      
Net assets acquired, net of cash and cash equivalents                       142,701      
Wind power capacity (megawatt AC) | MWac                         600    
Mid-West Wind Facilities | Empire Electric System                              
Business Acquisition [Line Items]                              
Total purchase price                       97,760      
Net assets acquired, net of cash and cash equivalents                              
Tax equity funding                       530,880      
Debt repaid upon maturity                       $ 789,923      
Mid-West Wind Facilities | North Fork Ridge Wind Project                              
Net assets acquired, net of cash and cash equivalents                              
Tax equity funding                             $ 29,446
Altavista Solar Facility                              
Business Acquisition [Line Items]                              
Total purchase price           $ 6,735                  
Net assets acquired, net of cash and cash equivalents                              
Working capital           870                  
Property, plant and equipment           138,343                  
Long-term debt           (122,024)                  
Asset retirement obligation           (3,332)                  
Deferred tax liability           (421)                  
Total net assets acquired           13,436                  
Cash and cash equivalents           33                  
Net assets acquired, net of cash and cash equivalents           $ 13,403                  
Equity interest (percent)           50.00%                  
Solar power capacity (megawatt ac) | MWac           80                  
Ownership interest acquired (percent)           50.00%                  
Maverick Creek and Sugar Creek Wind Facilities                              
Business Acquisition [Line Items]                              
Total purchase price             18,641                
Net assets acquired, net of cash and cash equivalents                              
Working capital             (15,557) $ (15,557) $ (15,557) $ (15,557) $ (15,557)        
Property, plant and equipment             1,062,613 1,062,613 1,062,613 1,062,613 1,062,613        
Long-term debt             (855,409) (855,409) (855,409) (855,409) (855,409)        
Asset retirement obligation             (23,402) (23,402) (23,402) (23,402) (23,402)        
Deferred tax liability             (337) (337) (337) (337) (337)        
Derivative instruments             7,575 7,575 7,575 7,575 7,575        
Total net assets acquired             175,483 175,483 175,483 175,483 175,483        
Cash and cash equivalents             4,241 4,241 4,241 4,241 4,241        
Net assets acquired, net of cash and cash equivalents             $ 171,242 $ 171,242 $ 171,242 $ 171,242 $ 171,242        
Equity interest (percent)             50.00% 50.00% 50.00% 50.00% 50.00%        
Number of wind projects                   2 2        
Ownership interest acquired (percent)             50.00% 50.00% 50.00% 50.00% 50.00%        
Investments in joint venture                           $ 43,797  
Maverick Creek Wind Facility                              
Net assets acquired, net of cash and cash equivalents                              
Wind power capacity (megawatt AC) | MWac                 492            
Tax equity funding             $ 380,829 $ 380,829 $ 380,829 $ 380,829 $ 380,829        
Debt repaid upon maturity             570,579                
Sugar Creek Wind Facility                              
Net assets acquired, net of cash and cash equivalents                              
Wind power capacity (megawatt AC) | MWac                 202            
Tax equity funding             147,914 $ 147,914 $ 147,914 $ 147,914 $ 147,914        
Debt repaid upon maturity             $ 284,829                
Ascendant                              
Business Acquisition [Line Items]                              
Total purchase price     $ 364,468                        
Net assets acquired, net of cash and cash equivalents                              
Working capital     71,948                        
Property, plant and equipment     417,947                        
Intangible assets     27,315                        
Goodwill (note 6)     93,202                        
Regulatory assets     9,859                        
Other assets     4,992                        
Long-term debt     (159,682)                        
Pension and other post-employment benefits     (58,746)                        
Derivative instruments     (12,748)                        
Other liabilities     (29,619)                        
Total net assets acquired     364,468                        
Cash and cash equivalents     42,920                        
Net assets acquired, net of cash and cash equivalents     $ 321,548                        
Weighted average useful life of assets     29 years                        
ESSAL                              
Business Acquisition [Line Items]                              
Total purchase price       $ 74,111 $ 87,975                    
Net assets acquired, net of cash and cash equivalents                              
Working capital       10,575                      
Property, plant and equipment       238,504                      
Intangible assets       37,095                      
Goodwill (note 6)       75,917                      
Other assets       1,394                      
Long-term debt       (144,335)                      
Deferred tax liability       (29,477)                      
Pension and other post-employment benefits       (2,292)                      
Other liabilities       (14,881)                      
Non-controlling interest (tax equity investors)       (84,525)                      
Total net assets acquired       87,975                      
Cash and cash equivalents       6,983                      
Net assets acquired, net of cash and cash equivalents       $ 80,992                      
Ownership interest acquired (percent)       43.00% 51.00%                    
Weighted average useful life of assets       40 years                      
Increase in goodwill       $ 5,535                      
Cumulative ownership interest acquired (percent)       94.00%                      
ESSAL | Third Party                              
Net assets acquired, net of cash and cash equivalents                              
Non-controlling interest (percent)             0.30% 0.30% 0.30% 0.30% 0.30%        
Ownership interest sold (percent)               0.32%              
Ownership interest sold             $ 51,750                
Ownership interest after transaction (percent)             0.64% 0.64% 0.64% 0.64% 0.64%