I dont think this is about light, its about heat. If you take a magnifying glass and focus the suns heat into something that produces steam, and or you take a satellite dish and focus the sun at a specific point, you can generate large amount of heat. this is already used elsewhere and is proven to work. Also Arizona land and climate isnt really suited for growing crops.
If some private company wants to build a toy in the middle of the desert, that is fine, but forcing the people to buy from this company will not provide any incentive for the company to operate efficiently, or give the best value to its captive customers.
Modern Marvels had segment on green power. There’s a plan in Australia to build an even larger solar plant based on heat. The difference in projects is that instead of mirrors, they build a large concrete tube(stack) Skyscrapper tall, and put some sort of polymer skirt around the base a hundred feet or so above the ground, spread out far and wide. The sun heats the trapped air under the skirt and is directed towards the base of the stack (the skirt is higher at the base of the stack than it is towards the outer edges) where there are wind generators. Convection takes care of the rest.