Elon Musk, the chief executive of Tesla Motors, sat in a glass-walled conference room here last week in the company's auto factory. Around him, workers and robots were building the $70,000 luxury vehicles that have redefined how people think about electric cars.
But autos are just one of Mr. Musk's many projects. A South African-born billionaire and entrepreneur, he is the top investor in the country's largest provider of rooftop solar power, runs a private rocket company, and in a blog post last week pledged to create a ride-sharing car service and battery-powered trucks and buses.
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