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ENERGY STORAGE SYSTEMS, NET - Schedule of Energy Storage Systems, Net (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (42,465)
Total energy storage systems, net	114,149
Energy storage systems placed into service
Property, Plant and Equipment [Line Items]
Total energy storage systems, gross	143,423
Energy storage systems not yet placed into service
Property, Plant and Equipment [Line Items]
Total energy storage systems, gross	$ 13,191

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