| Summary of Property, Plant and Equipment |
Property, plant and equipment at June 30, 2026 and December 31, 2025 consisted of the following: | | | | | | | | | | | | | | | | | | | Estimated Useful
Life (in Years) | | June 30, 2026 | | December 31, 2025 | | Energy systems | 10 - 15 years | | $ | 2,557,726 | | | $ | 2,488,929 | | | Machinery and equipment | 5 - 7 years | | 1,506,449 | | | 1,631,139 | | | Furniture and fixtures | 5 years | | 283,098 | | | 270,837 | | | Computer software | 3 - 5 years | | 192,865 | | | 192,865 | | | Leasehold improvements | * | | 1,195,016 | | | 1,166,708 | | | | | 5,735,154 | | | 5,750,478 | | | Less - accumulated depreciation and amortization | | | (4,204,845) | | | (4,141,157) | | | Property, plant and equipment, net | | | $ | 1,530,309 | | | $ | 1,609,321 | |
* Lesser of estimated useful life of asset or lease term
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