Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment, net

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Property, Plant and Equipment, net
 3 Months Ended
Mar. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net Property, Plant and Equipment, net
Property, plant and equipment at March 31, 2024 and December 31, 2023 consisted of the following:
Estimated Useful
Life (in Years)		 March 31, 2024 December 31, 2023
Energy systems 1 - 15 years $ 2,810,232  $ 2,810,232 
Machinery and equipment 5 - 7 years 1,675,931  1,744,596 
Furniture and fixtures 5 years 216,011  212,963 
Computer software 3 - 5 years 192,865  192,865 
Leasehold improvements * 592,396  466,789 
5,487,435  5,427,445 
Less - accumulated depreciation and amortization (4,340,366) (4,264,868)
Property, plant and equipment, net $ 1,147,069  $ 1,162,577 
* Lesser of estimated useful life of asset or lease term
Depreciation and amortization expense on property and equipment for the three months ended March 31, 2024 and 2023 was $94,838 and $117,492, respectively.