LOS ANGELES, CA - APRIL 30: Elon Musk, CEO of Tesla, unveils suit of batteries for homes, businesses, and utilities at Tesla Design Studio April 30, 2015 in Hawthorne, California. Musk unveiled the home battery named Powerwall with a selling price of $3500 for 10kWh and $3000 for 7kWh and very large utility pack called Powerpack. (Photo by Kevork Djansezian/Getty Images)
