Solar Energy Systems, net

3 Months Ended

Mar. 31, 2018

Solar Energy Systems Disclosure [Abstract]

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



	March 31, 2018			December 31, 2017
Solar energy system equipment costs	$	3,293,697		$	3,124,407
Inverters	333,822			317,390
Total solar energy systems	3,627,519			3,441,797
Less: accumulated depreciation and amortization	(430,780		)	(399,280		)
Add: construction-in-progress	89,065			119,053
Total solar energy systems, net	$	3,285,804		$	3,161,570

All solar energy systems, construction-in-progress and inverters have been leased to or are subject to signed Customer Agreements with customers. The Company recorded depreciation expense related to solar energy systems of $32.4 million and $25.8 million for the three months ended March 31, 2018 and 2017, respectively. The depreciation expense was reduced by the amortization of deferred grants of $1.9 million and $2.0 million for the three months ended March 31, 2018 and 2017, respectively.