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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT

19. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following regulated and non-regulated assets:
As atDecember 31December 31
millions of Canadian dollars Estimated useful life20172016
Generation3 to 131$ 11,010$ 10,553
Transmission15 to 80 2,786 2,799
Distribution4 to 80 5,660 5,715
Gas transmission and distribution7 to 85 2,867 2,895
General plant and other3 to 60 1,874 1,711
Total cost 24,197 23,673
Less: Accumulated depreciation (7,824) (7,787)
16,373 15,886
Construction work in progress 622 1,404
Net book value$ 16,995$ 17,290