the worst location in the continental U.S. is only a factor of two worse than the best solar location.
Solar is dead. Most of the US doesn't get enough sun to make solar feasible.
This article has a good solar efficiency study for the entire US. In summary, there's not a lot of difference in the contiguous US - about the only place where solar is significantly worse off is Alaska.
As long as we're going to reinvent the wheel again, we might as well try making it round this time. - Mike Dennison