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Intangible assets and goodwill
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets and goodwill Intangible assets and goodwill
Intangible assets consist of the following:
2020CostAccumulated amortizationNet book value
Power sales contracts$57,943 $41,184 $16,759 
Customer relationships (note 3)83,342 10,967 72,375 
Interconnection agreements15,028 1,458 13,570 
Other (a)
12,209  12,209 
$168,522 $53,609 $114,913 
(a) Other includes brand names, water rights and miscellaneous intangibles (note 3)

2019CostAccumulated amortizationNet book value
Power sales contracts$56,206 $38,931 $17,275 
Customer relationships26,797 10,104 16,693 
Interconnection agreements14,827 1,179 13,648 
$97,830 $50,214 $47,616 

Estimated amortization expense for intangible assets for the next year is $4,353, $4,194 in year two, $4,194 in year three, $4,194 in year four and $4,194 in year five.
All goodwill pertains to the Regulated Services Group.
 20202019
Opening balance$1,031,696 $954,282 
Business acquisitions (note 3)167,209 76,313 
Foreign exchange9,485 1,101 
Closing balance$1,208,390 $1,031,696