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ENERGY STORAGE SYSTEMS, NET | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
ENERGY STORAGE SYSTEMS, NET | 5. ENERGY STORAGE SYSTEMS, NET Energy Storage Systems, Net Energy storage systems, net, consists of the following (in thousands): ​
​ | ​ | ​ | ​ | ​
​ |  | March 31, 2021 |
Energy storage systems placed into service | ​ | $ | 145,555 | ​
Less: accumulated depreciation | ​ | ​ | (36,758) | ​
Energy storage systems not yet placed into service | ​ | ​ | 11,045 | ​
Total energy storage systems, net | ​ | $ | 119,842 | ​
​ Depreciation expense for energy storage systems was approximately $3.8 million and $3.6 million within cost of service revenue for the three months ended March 31, 2021 and 2020, respectively. |
Energy Storage Systems |  |
Property, Plant and Equipment [Line Items] |  |
ENERGY STORAGE SYSTEMS, NET |  | 8.ENERGY STORAGE SYSTEMS, NET Energy storage systems, net, consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Energy storage systems placed into service | ​ | $ | 144,425 | ​ | $ | 124,789
Less accumulated depreciation | ​ |  | (33,389) | ​ |  | (20,489)
Energy storage systems not yet placed into service | ​ |  | 12,667 | ​ |  | 27,269
Total energy storage systems, net | ​ | $ | 123,703 | ​ | $ | 131,569
​ Depreciation expense for the energy storage systems was approximately $13.9 million and $9.7 million within cost of service revenue for the years ended December 31, 2020 and 2019, respectively.

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