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Solar Energy Systems, net | 6 Months Ended
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Jun. 30, 2018
Solar Energy Systems Disclosure [Abstract] |
Solar Energy Systems, net | Solar Energy Systems, net Solar energy systems, net consists of the following (in thousands):
|  | June 30, 2018 |  | December 31, 2017
Solar energy system equipment costs |  | $ | 3,455,457 |  |  | $ | 3,124,407 |
Inverters |  | 353,422 |  |  | 317,390 |
Total solar energy systems |  | 3,808,879 |  |  | 3,441,797 |
Less: accumulated depreciation and amortization |  | (463,983 | ) |  | (399,280 | )
Add: construction-in-progress |  | 92,926 |  |  | 119,053 |
Total solar energy systems, net |  | $ | 3,437,822 |  |  | $ | 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 $33.9 million and $27.4 million for the three months ended June 30, 2018 and 2017, respectively, and $66.2 million and $53.2 million for the six months ended June 30, 2018 and 2017, respectively. The depreciation expense was reduced by the amortization of deferred grants of $1.9 million and $1.8 million for the three months ended June 30, 2018 and 2017, respectively, and $3.8 million and $3.8 million for the six months ended June 30, 2018 and 2017, respectively.

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