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Property, plant and equipment
 12 Months Ended
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
 CostAccumulated depreciationNet book value
Generation$2,918,692 $633,210 $2,285,482 
Distribution and transmission5,766,885 661,786 5,105,099 
Land114,847 — 114,847 
Equipment99,722 51,979 47,743 
Construction in progress
Generation136,424 — 136,424 
Distribution and transmission552,243 — 552,243 
$9,588,813 $1,346,975 $8,241,838 

2019
 CostAccumulated depreciationNet book value
Generation$2,816,611 $540,118 $2,276,493 
Distribution and transmission4,997,613 598,449 4,399,164 
Land74,517 — 74,517 
Equipment94,583 47,541 47,042 
Construction in progress
Generation140,235 — 140,235 
Distribution and transmission303,529 — 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:
20202019
Interest capitalized on non-regulated property$9,359 $4,538 
AFUDC capitalized on regulated property:
Allowance for borrowed funds3,475 2,745 
Allowance for equity funds2,219 4,896 
$15,053 $12,179