There's plenty of sun in the USA! The problem is the technology (concentrator technology is not yet ready for prime time), not the lack of sun. The good news is that a lot of companies are working on this area.

The sunbelt in the USA does well, but there is more, stronger sun in Mexico. And mirros can be a cheap way to up the intensity -- which should mean more profits. I am not sure if New York, Boston, Chicago, Seattle, etc can ever get a significant percentage of their energy from local sunshine. Thanks for the comment!

Silicon PV cells is as efficient as its going to get, as far as feeding current technoogy more sunlight in already sunlight rich areas, unless PV technology is significantly improved.In oother words, a full southern sun full saturates the electricity making capability of current PV panels.

What could be possible, is solar thermal plants, at least for solar concentration systems.

What about non-silicon based collection, such as cadmium telluride? Also, would mirrors allow you to extend the number of usable hours per day?

But I do like the idea of solar thermal plants, especially if bred to use multiplied solar energy.

On the other had, I wish I had a spare 20K to work on a multi-chamber solar steam engine using mirrors & the really hot phoenix hot sunlight. The steam drives the turbine, and the heat from the re-condensing steam is re-captured as best it can be. I know, it sounds like perpetual motion...

Mexico has a huge internal need for electricity. I think they have problems raising capital to do this.

Just for perspective: At the equator the incident power produced by the sun is approximately one gigawatt per square kilometer.