Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, plant and equipment at December 31, 2023 and 2022 consisted of the following:


	Estimated Useful Life (in Years)	2023		2022
Energy systems	10 - 15 years	$	2,810,232	$	2,810,232
Machinery and equipment	5 - 7 years	1,744,596		1,624,885
Furniture and fixtures	5 years	212,963		196,007
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	466,789		466,789
		5,427,445		5,290,778
Less - accumulated depreciation and amortization		(4,264,868)		(3,883,058)
Net property, plant and equipment		$	1,162,577	$	1,407,720

* Lesser of estimated useful life of asset or lease term