Billionaire Elon Musk, chief executive officer of Tesla Motors Inc., left, speaks as Jeffrey Straubel, chief technical officer and co-founder of Tesla Motors Inc., center, and Yoshihiko Yamada, consultant at Panasonic Corp., look on during a press event at Tesla's new Gigafactory in Sparks, Nevada, U.S., on Tuesday, July 26, 2016. Tesla officially opened its Gigafactory on Tuesday, a little more than two years after construction began. The factory is about 14 percent complete but when it's finished, it will be about 10 million square feet, or about the size of 262 NFL football fields. Photographer: Troy Harvey/Bloomberg via Getty Images
