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Intangible assets and goodwill
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets and goodwill Intangible assets and goodwill
Intangible assets consist of the following:
2022CostAccumulated amortizationNet book value
Power sales contracts$56,926 $42,818 $14,108 
Customer relationships77,850 13,709 64,141 
Interconnection agreements10,098 1,851 8,247 
Other (a)
10,338 151 10,187 
$155,212 $58,529 $96,683 
2021CostAccumulated amortizationNet book value
Power sales contracts$58,112 $43,118 $14,994 
Customer relationships78,140 12,337 65,803 
Interconnection agreements15,072 1,721 13,351 
Other (a)
10,968 — 10,968 
$162,292 $57,176 $105,116 
(a) Other includes brand names, water rights and miscellaneous intangibles
Estimated amortization expense for intangible assets for each of the next year is $2,580 and $2,572 for years two to five.
All goodwill pertains to the Regulated Services Group.
 20222021
Opening balance$1,201,244 $1,208,390 
Business acquisitions (note 3)123,751 5,535 
Foreign exchange(4,416)(12,681)
Closing balance$1,320,579 $1,201,244