www.thinkprogress.org/climate/2014/02/13/3289361/worlds-largest-solar-plant/
"With California struggling through one of the worst droughts on record, and Ivanpah already being located in a high desert climate, water conservation has been a major focus. Solar thermal plants use solar mirrors to heat water in boilers that in turn produce steam to turn the electricity generating turbines, are more water intensive than more common solar photovoltaic panels."