FILE PHOTO: Founder and CEO of Tesla Motors Elon Musk speaks during a media tour of the Tesla Gigafactory, which will produce batteries for the electric carmaker, in Sparks, Nevada, U.S. July 26, 2016. REUTERS/James Glover II

FILE PHOTO: Founder and CEO of Tesla Motors Elon Musk speaks during a media tour of the Tesla Gigafactory, which will produce batteries for the electric carmaker, in Sparks, Nevada, U.S. July 26, 2016. REUTERS/James Glover II