In 2010, the Chevron announced a 740 kW photovoltaic demonstration project in Bakersfield, California, called Project Brightfield, for exploring possibilities to use solar power for powering Chevron's facilities. It consists of technologies from seven companies, which Chevron is evaluating for large-scale use. In Fellows, California, Chevron has invested in the 500 kW Solarmine photovoltaic solar project, which supplies daytime power to the Midway-Sunset Oil Field. In Questa, Chevron has built a 1 MW concentrated photovoltaic plant that comprises 173 solar arrays, which use Fresnel lenses. In October 2011, Chevron launched a 29-MW thermal solar-to-steam facility in the Coalinga Field to produce the steam for enhanced oil recovery. As of 2012, the project is the largest of its kind in the world.