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ENERGY STORAGE SYSTEMS, NET
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
ENERGY STORAGE SYSTEMS, NET ENERGY STORAGE SYSTEMS, NET
Energy Storage Systems, Net
Energy storage systems, net, consists of the following (in thousands):
December 31, 2022December 31, 2021
Energy storage systems placed into service$143,154 $143,592 
Less: accumulated depreciation(58,782)(45,250)
Energy storage systems not yet placed into service6,385 7,772 
Total energy storage systems, net$90,757 $106,114 
Depreciation expense for energy storage systems was approximately $14.9 million, $14.4 million and $13.9 million for the years ended December 31, 2022, 2021, and 2020, respectively. Depreciation expense is recognized in cost of service revenue.