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Property, plant and equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, plant and equipment Property, plant and equipment
Property, plant and equipment consist of the following:
2021
 CostAccumulated depreciationNet book value
Generation$4,187,197 $751,219 $3,435,978 
Distribution and transmission7,468,236 780,537 6,687,699 
Land114,821 — 114,821 
Equipment101,971 56,464 45,507 
Construction in progress
Generation148,302 — 148,302 
Distribution and transmission610,139 — 610,139 
$12,630,666 $1,588,220 $11,042,446 

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 
Generation assets include cost of $114,868 (2020 - $111,806) and accumulated depreciation of $46,649 (2020 - $43,444) related to facilities under financing lease or owned by consolidated VIEs. Depreciation expense of facilities under finance leases was $1,716 (2020 - $1,708).
Distribution and transmission assets include the following:
•Cost of $2,018,039 (2020 - $885,087) and accumulated depreciation of $72,484 (2020 - $28,779) related to regulated generation assets. In 2020, the Asbury plant ceased operations and net book value was transferred to a regulatory asset (note 7(b)).
•Cost of $557,954 (2020 - $531,191) and accumulated depreciation of $59,857 (2020 - $50,919) related to commonly owned facilities (note 1(k)). Total expenditures incurred on these facilities for the year ended December 31, 2021 were $143,255 (2020 - $61,827).
•Cost of $3,076 (2020 - $3,076) and accumulated depreciation of $1,665 (2020 - $1,321) related to assets under finance lease.
For the year ended December 31, 2021, contributions received in aid of construction of $6,376 (2020 - $4,214) 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 2021 and 2020 are as follows:
20212020
Interest capitalized on non-regulated property$3,313 $9,359 
AFUDC capitalized on regulated property:
Allowance for borrowed funds3,208 3,475 
Allowance for equity funds5,725 2,219 
$12,246 $15,053