Elon Musk’s Most Impressive Company Isn’t Tesla or SpaceX. It’s SolarCity.

There’s a huge, ongoing, and justifiable obsession with Elon Musk and his ventures—chiefly Tesla, the electric car manufacturer, and SpaceX, his private spacecraft business. It’s not surprising a biography of the man was a best-seller this year. But to my mind, the most important and interesting venture that the polymathic...
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