Regarding the global solar power, I dont think you believe that anyone would consider using KSA as their solar-powered energy source when they have their own. For example the plan for EU is:
http://www.guardian.co.uk/business/2009/nov/01/solar-power-sahara-europe-desertec#
And there is no problem with sandstorms as long as they are not global and there is extra capacity that is part of the grid.
Also take a look how much power USA has compared to EU:
http://i160.photobucket.com/albums/t175/jcwinni/Sunbelt_Map_550x366.jpg
