Maybe everyone knows about these already but here are links to two utility scale solar projects under construction:
370MW Ivanpah plant in Cali is solar thermal.
BrightSource formally breaks ground at Ivanpah | Brightsource Ivanpah
290MW Agua Caliente in AZ is PV.
Agua Caliente Solar Project ? Yuma County, Arizona ? First Solar
Both are supposed to be online in 2013.