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Risk Management Activities - Maturity of Non-Hedges (Details) - 12 months ended Dec. 31, 2021 - Non-Hedges - Commodity risk management
CAD ($)
$ / $
CAD ($)
$ / $
AUD ($)
cADPerMegawattHour
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2022        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount $ 8,000,000 $ 8,000,000 $ 14,000,000  
Average foreign exchange rate 0.7893 0.7352    
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount $ 0 $ 0 0  
Average foreign exchange rate 0 0    
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2024        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount $ 0 $ 0 0  
Average foreign exchange rate 0 0    
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2025        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount $ 0 $ 0 0  
Average foreign exchange rate 0 0    
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount $ 0 $ 0 0  
Average foreign exchange rate 0 0    
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | More than five years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount $ 0 $ 0 $ 0  
Average foreign exchange rate 0 0    
Electricity | 2022        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount | $ $ 3,329,000 $ 3,329,000    
Average power prices | cADPerMegawattHour       cADPerMegawattHour 71.95
Electricity | 2023        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount | $ 3,329,000 3,329,000    
Average power prices | cADPerMegawattHour       73.76
Electricity | 2024        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount | $ 3,338,000 3,338,000    
Average power prices | cADPerMegawattHour       75.6
Electricity | 2025        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount | $ 2,628,000 2,628,000    
Average power prices | cADPerMegawattHour       77.49
Electricity | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount | $ 0 0    
Average power prices | cADPerMegawattHour       0
Electricity | More than five years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Notional amount | $ $ 0 $ 0    
Average power prices | cADPerMegawattHour       cADPerMegawattHour 0