| Summary of Property, Plant and Equipment |
Property, plant and equipment at March 31, 2025 and December 31, 2024 consisted of the following: | | | | | | | | | | | | | | | | | | | Estimated Useful
Life (in Years) | | March 31, 2025 | | December 31, 2024 | | Energy systems | 10 - 15 years | | $ | 2,810,232 | | | $ | 2,810,232 | | | Machinery and equipment | 5 - 7 years | | 1,606,447 | | | 1,598,538 | | | Furniture and fixtures | 5 years | | 239,402 | | | 224,868 | | | Computer software | 3 - 5 years | | 192,865 | | | 192,865 | | | Leasehold improvements | * | | 1,016,316 | | | 906,739 | | | | | 5,865,262 | | | 5,733,242 | | | Less - accumulated depreciation and amortization | | | (4,090,974) | | | (3,995,206) | | | Property, plant and equipment, net | | | $ | 1,774,288 | | | $ | 1,738,036 | | | | | | | | | | | | | |
* Lesser of estimated useful life of asset or lease term
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