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ENERGY STORAGE SYSTEMS, NET (Tables)
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Energy Storage Systems, Net Energy storage systems, net, consists of the following (in thousands):
June 30, 2021
Energy storage systems placed into service$144,754 
Less: accumulated depreciation(39,848)
Energy storage systems not yet placed into service13,310 
Total energy storage systems, net$118,216