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ENERGY STORAGE SYSTEMS, NET
3 Months Ended
Mar. 31, 2023
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):
March 31,December 31,
20232022
Energy storage systems placed into service$141,975 $143,154 
Less: accumulated depreciation(60,586)(58,782)
Energy storage systems not yet placed into service6,361 6,385 
Total energy storage systems, net$87,750 $90,757 
Depreciation expense for energy storage systems was approximately $3.6 million and $4.3 million for the three months ended March 31, 2023 and 2022, respectively. Depreciation expense is recognized in cost of services and other revenue.