I'm not convinced this is cost effective. As someone suggested in the comments, use that space to build a nuclear plant and produce far more power that is more reliable.
Just to put things in perspective, it would take 20 of these (about 20 square miles of land) to equal the power generation of a new nuclear reactor. Keep in mind that that is only at peak power, as in a cloudless day in the middle of summer. Factoring in nights, winters, and clouds, the average power produced would be far lower.
