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Property, Plant and Equipment | 12 Months Ended
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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 at |  | December 31 | December 31
millions of Canadian dollars | Estimated useful life |  | 2019 (1) |  | 2018
Generation (2) | 3 to 131 | $ | 11,181 | $ | 11,092
Transmission | 11 to 80 |  | 2,318 |  | 3,047
Distribution | 4 to 80 |  | 5,820 |  | 6,348
Gas transmission and distribution | 7 to 85 |  | 3,546 |  | 3,398
General plant and other | 2 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.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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