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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
20. Property, Plant and Equipment  
Regulated and Non-Regulated Assets
Property, plant and equipment consisted of the following regulated and non-regulated assets:
As atDecember 31December 31
millions of Canadian dollars Estimated useful life20202019
Generation 3 to 131$ 11,474$ 11,181
Transmission11 to 80 2,414 2,318
Distribution4 to 80 5,997 5,820
Gas transmission and distribution7 to 85 3,879 3,568
General plant and other (1)2 to 60 2,127 2,006
Total cost 25,891 24,893
Less: Accumulated depreciation (1) (8,714) (8,317)
17,177 16,576
Construction work in progress (1) 2,358 1,591
Net book value$ 19,535$ 18,167
(1) SeaCoast owns a 50% undivided ownership interest in a jointly owned 26-mile pipeline lateral located in Florida, which went into service in 2020. At December 31, 2020, SeaCoast’s share of plant in service was $34 million, accumulated depreciation of nil and construction work in progress of nil. At December 31, 2019, SeaCoast’s share of construction work in progress was $8 million. SeaCoast’s undivided ownership interest is financed with its funds and all operations are accounted for as if such participating interest was a wholly owned facility. SeaCoast’s share of direct expenses of the jointly owned pipeline is included in OM&G in the Consolidated Statements of Income.