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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
December 31, 2024Weighted Average Amortization RateCost Accumulated AmortizationNet
(millions of Canadian dollars)    
Software10.9 %2,109 (1,222)887 
Power purchase agreements4.5 %58 (26)32 
Project agreement1
4.0 %173 (52)121 
Customer relationships8.6 %2,856 (975)1,881 
Biogas rights agreements3.4 %999 (34)965 
Other intangible assets
5.8 %665 (234)431 
Under development
— %270 — 270 
  7,130 (2,543)4,587 

December 31, 2023Weighted Average Amortization RateCostAccumulated AmortizationNet
(millions of Canadian dollars)
    
Software12.0 %1,921 (1,090)831 
Power purchase agreements4.3 %58 (24)34 
Project agreement1
4.0 %158 (41)117 
Customer relationships8.6 %2,636 (675)1,961 
Other intangible assets
8.2 %603 (185)418 
Under development
— %176 — 176 
  5,552 (2,015)3,537 
1Represents a project agreement acquired from the merger of Enbridge and Spectra Energy.

For the years ended December 31, 2024, 2023 and 2022, our amortization expense related to intangible assets totaled $530 million, $535 million and $483 million, respectively. Our expected amortization expense associated with existing intangible assets for each of the years 2025 to 2029 is $558 million.