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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2019
19. Property, Plant and Equipment  
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 life2019 (1)2018
Generation (2)3 to 131$ 11,181$ 11,092
Transmission11 to 80 2,318 3,047
Distribution4 to 80 5,820 6,348
Gas transmission and distribution7 to 85 3,546 3,398
General plant and other2 to 60 2,006 2,158
Total cost 24,871 26,043
Less: Accumulated depreciation (2) (8,295) (8,567)
16,576 17,476
Construction work in progress 1,591 1,236
Net book value$ 18,167$ 18,712
(1) Excludes Emera Maine balances classified as held for sale as at December 31, 2019. Refer to the note 4 for further details.
(2) On March 29, 2019, the Company sold its NEGG facilities. As of December 31, 2018, the Company classified these assets as held for sale on the Consolidated Balance Sheets. Refer to note 4 for additional information.