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Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Estimated Useful Lives of Depreciable Assets The ranges of estimated useful lives and the weighted average useful lives are summarized below:
 
Range of useful lives
 
Weighted average
useful lives
 
2019
 
2018
 
2019
 
2018
Generation
3 - 60
 
3 - 60
 
33
 
33
Distribution
5 - 100
 
5 - 100
 
42
 
40
Equipment
5 - 44
 
5 - 43
 
10
 
10
Schedule of Operating Leases Schedule s.
The Company's operating leases payments for the next five years and thereafter are as follows:
Year 1
 
Year 2
 
Year 3
 
Year 4
 
Year 5
 
Thereafter
 
Total
$
2,115

 
$
1,138

 
$
688

 
$
659

 
$
642

 
$
5,195

 
$
10,437

The lease payments for the Company's finance leases are expected to be approximately $539 annually for the next five years, and $318 thereaf