Please hop over to The Oil Drum and read Concentrating Solar Power, a very good introduction to the basics of CSP and some humongous projects in the works.

One minor detail: “CSP” can be a somewhat confusing term, as it’s used to refer to a variant of photovoltaic power, in which lenses focus light onto solar cells to boost their efficiency, as well as to solar thermal (in the article above), that uses large mirrors to focus light and collect heat that’s ultimately used to drive electricity generating turbines.