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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT

20. 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 life20162015
Generation3 to 131$ 10,553$ 4,957
Transmission28 to 77 2,799 1,603
Distribution11 to 80 5,715 2,503
Gas transmission and distribution10 to 85 2,895 -
General plant and other3 to 50 1,711 932
Total cost 23,673 9,995
Less: Accumulated depreciation (7,787) (3,737)
15,886 6,258
Construction work in progress 1,404 211
Net book value$ 17,290$ 6,469