Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, plant and equipment at June 30, 2018 and December 31, 2017 consisted of the following:



	Estimated Useful Life (in Years)	June 30, 2018			December 31, 2017
Energy systems	1 - 15 years	$	12,125,434		$	12,466,642
Machinery and equipment	5 - 7 years	1,363,117			1,215,951
Furniture and fixtures	5 years	104,317			205,320
Computer software	3 - 5 years	233,478			115,253
Leasehold improvements	*	450,792			440,519
		14,277,138			14,443,685
Less - accumulated depreciation and amortization		(2,915,698		)	(2,177,974		)
		$	11,361,440		$	12,265,711

* Lesser of estimated useful life of asset or lease term