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ENERGY STORAGE SYSTEMS, NET | 12 Months Ended
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Dec. 31, 2022
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):
| December 31, 2022 |  | December 31, 2021
Energy storage systems placed into service | $ | 143,154 |  |  | $ | 143,592 |
Less: accumulated depreciation | (58,782) |  |  | (45,250) |
Energy storage systems not yet placed into service | 6,385 |  |  | 7,772 |
Total energy storage systems, net | $ | 90,757 |  |  | $ | 106,114 |
Depreciation expense for energy storage systems was approximately $14.9 million, $14.4 million and $13.9 million for the years ended December 31, 2022, 2021, and 2020, respectively. Depreciation expense is recognized in cost of service revenue.

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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