A simpler design called compact linear fresnel reflector (CLFR) solar collector reduces the cost significantly. It uses simple flat (or slightly curved) mirrors, an optical system originally developed by French engineer Augustin-Jean Fresnel. It weighs 3 kg/m2 , only one third of parabolic trough mirror. It has a much lower concentrating temperature, at 285 °C (545°F) , , Ausra Inc.’s Fresnel Principle technology, originally developed by founder David Mills at Sydney University, currently can operate in a $10-cent-per-KW range, about the same as the current market price in terms of grid base load in the U.S. In October 2008, Ausra just launched a 5-MW solar thermal plant in Bakersfield, California, with a 177-MW plant in planning.