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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, plant and equipment Property, plant and equipment consist of the following:
2020 |
| Cost |  | Accumulated depreciation |  | Net book value
Generation | $ | 2,918,692 |  |  | $ | 633,210 |  |  | $ | 2,285,482 |
Distribution and transmission | 5,766,885 |  |  | 661,786 |  |  | 5,105,099 |
Land | 114,847 |  |  | — |  |  | 114,847 |
Equipment | 99,722 |  |  | 51,979 |  |  | 47,743 |
Construction in progress |  |  |  |  |
Generation | 136,424 |  |  | — |  |  | 136,424 |
Distribution and transmission | 552,243 |  |  | — |  |  | 552,243 |
| $ | 9,588,813 |  |  | $ | 1,346,975 |  |  | $ | 8,241,838 |
2019 |
| Cost |  | Accumulated depreciation |  | Net book value
Generation | $ | 2,816,611 |  |  | $ | 540,118 |  |  | $ | 2,276,493 |
Distribution and transmission | 4,997,613 |  |  | 598,449 |  |  | 4,399,164 |
Land | 74,517 |  |  | — |  |  | 74,517 |
Equipment | 94,583 |  |  | 47,541 |  |  | 47,042 |
Construction in progress |  |  |  |  |
Generation | 140,235 |  |  | — |  |  | 140,235 |
Distribution and transmission | 303,529 |  |  | — |  |  | 303,529 |
| $ | 8,427,088 |  |  | $ | 1,186,108 |  |  | $ | 7,240,980 |
Generation assets include cost of $111,806 (2019 - $109,653) and accumulated depreciation of $43,444 (2019 - $39,638) related to facilities under financing lease or owned by consolidated VIEs. Depreciation expense of facilities under finance leases was $1,708 (2019 - $1,615). Distribution and transmission assets include the following: •Cost of $885,087 (2019 - $1,125,062) and accumulated depreciation of $28,779 (2019 - $81,480) related to regulated generation assets. In 2020, the Asbury plant ceased operations and net book value was transferred to a regulatory asset (note 7(a)). •Cost of $531,191 (2019 - $514,709) and accumulated depreciation of $50,919 (2019 - $31,349) related to commonly owned facilities (note 1(k)). Total expenditures incurred on these facilities for the year ended December 31, 2020 were $61,827 (2019 - $69,210). •Cost of $3,076 (2019 - $3,076) and accumulated depreciation of $1,321 (2019 - $1,003) related to assets under finance lease. •Expansion costs of $1,000 (2019 - $1,000) on which the Company does not currently earn a return. For the year ended December 31, 2020, contributions received in aid of construction of $4,214 (2019 - $7,137) have been credited to the cost of the assets. 5. Property, plant and equipment (continued) Interest and AFUDC capitalized to the cost of the assets in 2020 and 2019 are as follows:
| 2020 |  | 2019
Interest capitalized on non-regulated property | $ | 9,359 |  |  | $ | 4,538 |
AFUDC capitalized on regulated property: |  |  |
Allowance for borrowed funds | 3,475 |  |  | 2,745 |
Allowance for equity funds | 2,219 |  |  | 4,896 |
| $ | 15,053 |  |  | $ | 12,179 |

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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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