WAYNE, MI - DECEMBER 14: A Ford Focus is built on the assembly line at the Ford Motor Co.'s Michigan Assembly Plant December 14, 2011 in Wayne, Michigan. Ford released details about the electrification of the Michigan Assembly Plant that will power production in part by one of the largest solar energy generator systems in order to produce their new C-MAX Hybrid and C-MAX Energi electric vehicles. (Photo by Bill Pugliano/Getty Images)
WAYNE, MI - DECEMBER 14: A Ford Focus is built on the assembly line at the Ford Motor Co.'s Michigan Assembly Plant December 14, 2011 in Wayne, Michigan. Ford released details about the electrification of the Michigan Assembly Plant that will power production in part by one of the largest solar energy generator systems in order to produce their new C-MAX Hybrid and C-MAX Energi electric vehicles. (Photo by Bill Pugliano/Getty Images)
