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ENERGY STORAGE SYSTEMS, NET (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Property, Plant and Equipment [Line Items]

Schedule of Energy Storage Systems

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	​

Energy Storage Systems

Property, Plant and Equipment [Line Items]

Schedule of Energy Storage Systems

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

​

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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-Name Accounting Standards Codification
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