"Elon Musk, co-founder and chief executive officer of Tesla Motors Inc., speaks during the unveiling of the company's ""Powerwall' at an event in Hawthorne, California, U.S., on Thursday, April 30, 2015. Musk unveiled a suite of batteries to store electricity for homes, businesses and utilities, saying a greener power grid furthers the company's mission to provide pollution-free energy. Photographer: Tim Rue/Bloomberg via Getty Images"
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