Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment

Property, Plant and Equipment

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, net

Property, plant and equipment at June 30, 2021 and December 31, 2020 consisted of the following:


	Estimated Useful Life (in Years)	June 30, 2021		December 31, 2020
Energy systems	1 - 15 years	$	3,556,488	$	3,526,514
Machinery and equipment	5 - 7 years	1,495,528		1,448,024
Furniture and fixtures	5 years	193,698		193,698
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	450,792		450,792
		5,889,371		5,811,893
Less - accumulated depreciation and amortization		(3,864,037)		(3,528,047)
		$	2,025,334	$	2,283,846

* 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, 2021 and 2020 was $145,458 and $306,014 and $176,357 and $352,017, respectively.