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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, plant and equipment Property, plant and equipment consist of the following:
2017 |  |  |  |  |
| Cost |  | Accumulated depreciation |  | Net book value
Generation | $ | 2,988,569 |  |  | $ | 494,912 |  |  | $ | 2,493,657 |
Distribution | 5,247,499 |  |  | 483,345 |  |  | 4,764,154 |
Land | 89,935 |  |  | — |  |  | 89,935 |
Equipment and other | 143,158 |  |  | 51,026 |  |  | 92,132 |
Construction in progress |  |  |  |  |
Generation | 263,418 |  |  | — |  |  | 263,418 |
Distribution | 206,197 |  |  | — |  |  | 206,197 |
| $ | 8,938,776 |  |  | $ | 1,029,283 |  |  | $ | 7,909,493 |
2016 |  |  |  |  |
| Cost |  | Accumulated depreciation |  | Net book value
Generation | $ | 2,613,267 |  |  | $ | 419,227 |  |  | $ | 2,194,040 |
Distribution | 2,638,488 |  |  | 462,454 |  |  | 2,176,034 |
Land | 60,868 |  |  | — |  |  | 60,868 |
Equipment and other | 139,961 |  |  | 44,700 |  |  | 95,261 |
Construction in progress |  |  |  |  |
Generation | 197,405 |  |  | — |  |  | 197,405 |
Distribution | 166,338 |  |  | — |  |  | 166,338 |
| $ | 5,816,327 |  |  | $ | 926,381 |  |  | $ | 4,889,946 |
Generation assets include cost of $142,789 (2016 - $142,246) and accumulated depreciation of $43,792 (2016 - $39,958) related to facilities under capital lease or owned by consolidated VIEs. Depreciation expense of facilities under capital lease was $2,117 (2016 - $2,117). Distribution assets include cost of $2,234,243 and accumulated depreciation of $587,202 related to regulated generation and transmission assets. Water and wastewater distribution assets include expansion costs of $1,000 on which the Company does not currently earn a return. For the year ended December 31, 2017, contributions received in aid of construction of $16,044 (2016 - $49,794) have been credited to the cost of the assets. The 2016 credit also includes Canadian renewable and conservation expense refundable tax credit for the St Damase wind facility in the amount of $14,086.

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- References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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