Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment, net

Property, Plant and Equipment, net

6 Months Ended

Jun. 30, 2022

Property, Plant and Equipment [Abstract]

Property, plant and equipment at June 30, 2022 and December 31, 2021 consisted of the following:


	Estimated Useful Life (in Years)	June 30, 2022		December 31, 2021
Energy systems	1 - 15 years	$	3,478,824	$	3,556,488
Machinery and equipment	5 - 7 years	1,613,029		1,463,153
Furniture and fixtures	5 years	196,007		193,698
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	466,789		466,789
		5,947,514		5,872,993
Less - accumulated depreciation and amortization		(4,236,870)		(4,090,049)
		$	1,710,644	$	1,782,944

* Lesser of estimated useful life of asset or lease term

Depreciation and amortization expense on property and equipment for the three and six months ended June 30, 2022 and 2021 was $123,818 and $250,610 and $145,458 and $306,014, respectively. During the six months ended June 30, 2022, we received proceeds of $67,169 from the disposition of certain assets, realizing a gain of $36,445.