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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
20. Property, Plant and Equipment |
Property, Plant and Equipment | 20. PROPERTY, PLANT AND EQUIPMENT
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 The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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