BrightSource is doing just that (Yes, 400 Megawat Solar Power Plant) and has filed an application with California to build these plants. (if only they were COOP, UGH!) The idea is to build 3 power plants, two 100 megawatt power plants and one 200 megawatt solar power plant. These power plants will be made up of many sun-tracking mirrors that focus on a tower with water that boils and rotates a turbine to create electricity. I am all for building solar power plants in the desert, living in Arizona for over 2 weeks makes me think, lets cover more of Arizona with solar.
BrightSource is not the only utility company going green, some of the others utility companies are also thinking solar like Southern California Edison who are contracting a large-scale solar power plant with Stirling Energy Systems. As for where power is going, BrightSource has talked about selling the power to PG&E(PCG) a California utility company.

antics says 7th September @ 8:03
There’s also one in Seville, Spain (I think - somewhere in spain anyway). Same company? Its definately a cool (no, wait, its ‘hot’) idea and I’m glad to see more of them popping up. There is another company in CA that uses heliostatic solar dishes to drive a sterling engine. Nice find!