Ausra, previously blogged on here, a CA bay area solar thermal power startup which has raised significant funds from Khosla Ventures and Kleiner Perkins, along with PG&E and Florida Power and Light (one of the nation's biggest wind developers) made a splash at the Clinton Global Initiative Meeting when they committed to building 2.0GW of solar thermal.
Using the MIT Energy Club's handy "U.S. Electricity Fact Sheet" one sees that the U.S. peak power capacity is ~1000 GW. One company consortium announcing solar thermal projects that would make up 0.2% of all electric power is nothing to sniff at.
Also, their commitment likely has some weight behind it: if they don't live up to it, Bill Clinton won't invite them back to his Meeting next year. :)