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Property, Plant and Equipment (Tables) | 12 Months Ended
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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 at |  | December 31 | December 31
millions of Canadian dollars | Estimated useful life |  | 2020 |  | 2019
Generation | 3 to 131 | $ | 11,474 | $ | 11,181
Transmission | 11 to 80 |  | 2,414 |  | 2,318
Distribution | 4 to 80 |  | 5,997 |  | 5,820
Gas transmission and distribution | 7 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.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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