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ENERGY STORAGE SYSTEMS, NET | 6 Months Ended
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Jun. 30, 2021
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):
| June 30, 2021
Energy storage systems placed into service | $ | 144,754 |
Less: accumulated depreciation | (39,848) |
Energy storage systems not yet placed into service | 13,310 |
Total energy storage systems, net | $ | 118,216 |
Depreciation expense for energy storage systems was approximately $3.6 million and $3.4 million within cost of service revenue for the three months ended June 30, 2021 and 2020, respectively, and approximately $7.3 million and $5.7 million within cost of service revenue for the six months ended June 30, 2021 and 2020, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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