Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2018

Property, plant and equipment at March 31, 2018 and December 31, 2017 consisted of the following:



	Estimated Useful Life (in Years)	March 31, 2018			December 31, 2017
Energy systems	1 - 15 years	$	12,548,796		$	12,466,642
Machinery and equipment	5 - 7 years	1,284,203			1,215,951
Furniture and fixtures	5 years	104,317			205,320
Computer software	3 - 5 years	233,478			115,253
Leasehold improvements	*	450,772			440,519
		14,621,566			14,443,685
Less - accumulated depreciation and amortization		(2,573,083		)	(2,177,974		)
		$	12,048,483		$	12,265,711

* Lesser of estimated useful life of asset or lease term