A 2012 Chevrolet Volt electric vehicle is parked at the solar-powered electric charging station in Hamtramck

 
A 2012 Chevrolet Volt electric vehicle is parked at the solar-powered electric charging station in Hamtramck
A 2012 Chevrolet Volt electric vehicle is parked at the solar-powered electric charging station at General Motors Co's assembly plant in Hamtramck, Michigan in this file photo taken on August 9, 2011. General Motors Co will temporarily halt production of its Chevrolet Volt plug-in hybrid and lay off 1,300 workers for five weeks this spring, a spokesman said on March 2, 2012. Workers are expected to return to work on April 23. Photo taken August 9, 2011. REUTERS/Rebecca Cook/Files (UNITED STATES - Tags: TRANSPORT ENERGY ENVIRONMENT BUSINESS)