A Chevrolet Volt plug-in hybrid vehicle is being charged at Stewart Chevrolet in Colma, California, U.S., October 3, 2017. REUTERS/Stephen Lam/File Photo
A Chevrolet Volt plug-in hybrid vehicle is being charged at Stewart Chevrolet in Colma, California, U.S., October 3, 2017. REUTERS/Stephen Lam/File Photo