I believe the US produces about 800 Gigawatts. 430 Megawatts is about half the size of a single nuke plant.
To put that in perspective, it takes roughly a decade to build a nuclear power plant. So that's ~500MW/year capacity for solar compared to ~100MW/year capacity for nuclear.
If what they are saying is true, they could make a good piece of money in the southwest.
If not, well, we'll never hear from them again. It's win/win for most of us. :P