While I'm all for solar power, the costs are still high. As I understand it, solar panels currently cost in the range of $400 per square meter (this may be retail). A 10 square mile array would be about 250 million square meters, costing $1.6 trillion dollars. Even with a 10x reduction for commercial application and another 10x for improved efficiencies, you are still left with 16 billion dollars for the panels alone, which is a pretty big investment. The Hoover Dam cost about 1/100 of that to build, though of course that was in 1935 dollars.

It will come.

As I've said before, I think a combination of power sources is the way to go, but nuclear offers the most effective bridge source, and maybe long term as well. Getting away from fossil fuels is imperative, for many reasons.