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SOLAR POWER SYSTEMS, NET
12 Months Ended
Dec. 31, 2019
SOLAR POWER SYSTEMS, NET  
SOLAR POWER SYSTEMS, NET

7. SOLAR POWER SYSTEMS , NET

Solar power systems, net consist of the following:

At December 31,

At December 31,

    

2018

    

2019

$

$

Solar power systems in operation

66,641

70,449

Solar power systems under construction

4,484

4,830

Accumulated depreciation

(16,227)

(22,322)

Solar power systems, net

54,898

52,957

Depreciation expense of solar power systems was $5,683, $3,756 and $6,379 for the years ended December 31, 2017, 2018 and 2019, respectively.