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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consist of the following: 
2018
 
 
 
 
 
 
Cost
 
Accumulated
depreciation
 
Net book
value
Generation
$
2,470,279

 
$
450,230

 
$
2,020,049

Distribution
4,455,935

 
521,236

 
3,934,699

Land
73,773

 

 
73,773

Equipment and other
88,757

 
41,295

 
47,462

Construction in progress
 
 
 
 
 
   Generation
104,996

 

 
104,996

   Distribution
212,579

 

 
212,579

 
$
7,406,319

 
$
1,012,761

 
$
6,393,558










5.
Property, plant and equipment (continued)
2017
 
 
 
 
 
 
Cost
 
Accumulated
depreciation
 
Net book
value
Generation
$
2,382,279

 
$
394,509

 
$
1,987,770

Distribution
4,205,823

 
388,859

 
3,816,964

Land
71,689

 

 
71,689

Equipment and other
91,233

 
37,104

 
54,129

Construction in progress
 
 
 
 
 
   Generation
209,979

 

 
209,979

   Distribution
164,366

 

 
164,366

 
$
7,125,369

 
$
820,472

 
$
6,304,897