Solar Energy Systems, net

3 Months Ended

Mar. 31, 2019

Solar Energy Systems Disclosure [Abstract]

Solar energy systems, net consists of the following (in thousands):



	March 31, 2019			December 31, 2018
Solar energy system equipment costs	$	4,012,116		$	3,823,853
Inverters	416,088			396,054
Total solar energy systems	4,428,204			4,219,907
Accumulated depreciation and amortization	(575,094		)	(535,891		)
Construction-in-progress	123,394			136,001
Total solar energy systems, net	$	3,976,504		$	3,820,017

All solar energy systems, including construction-in-progress, have been leased to or are subject to signed Customer Agreements with customers. The Company recorded depreciation expense related to solar energy systems of $39.4 million and $32.4 million for the three months ended March 31, 2019 and 2018, respectively. The depreciation expense was reduced by the amortization of deferred grants of $2.0 million and $1.9 million for the three months ended March 31, 2019 and 2018, respectively.