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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
The following table provides the weighted average amortization rate, gross carrying value, accumulated amortization and net carrying value for each of our major classes of intangible assets:
 Weighted Average Accumulated 
December 31, 2020Amortization RateCost AmortizationNet
(millions of Canadian dollars)    
Customer relationships5.0 %724 (139)585 
Power purchase agreements4.5 %63 (18)45 
Project agreement1
4.0 %153 (21)132 
Software10.5 %2,292 (1,334)958 
Other intangible assets2
2.7 %456 (96)360 
  3,688 (1,608)2,080 

 
Weighted Average
 
Accumulated
 
December 31, 2019
Amortization Rate
Cost 
Amortization
Net
(millions of Canadian dollars)
    
Customer relationships
5.0 %734 (104)630 
Power purchase agreements
4.5 %64 (16)48 
Project agreement1
4.0 %156 (16)140 
Software
11.0 %2,115 (1,141)974 
Other intangible assets2
2.9 %463 (82)381 
  3,532 (1,359)2,173 
1 Represents a project agreement acquired from the merger of Enbridge and Spectra Energy.
2 The measurement of weighted average amortization rate excludes non-depreciable intangible assets.

For the years ended December 31, 2020, 2019 and 2018, our amortization expense related to intangible assets totaled $294 million, $296 million and $281 million, respectively. The following table presents our expected amortization expense associated with existing intangible assets for the years indicated as follows:
20212022202320242025
Forecast of amortization expense
(millions of Canadian dollars)
298270245222202