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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Property, plant and equipment at December 31, 2024 and 2023 consisted of the following:
Estimated Useful
Life (in Years)
20242023
Energy systems
10 - 15 years
$2,810,232 $2,810,232 
Machinery and equipment
5 - 7 years
1,598,538 1,744,596 
Furniture and fixtures
5 years
224,868 212,963 
Computer software
3 - 5 years
192,865 192,865 
Leasehold improvements*906,739 466,789 
  5,733,242 5,427,445 
Less - accumulated depreciation and amortization (3,995,206)(4,264,868)
Net property, plant and equipment $1,738,036 $1,162,577 
* Lesser of estimated useful life of asset or lease term