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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
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 
Capitalization of Interest
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