Tesla CEO Elon Musk is no stranger to risky but successful ventures. He’s helped found companies such as PayPal and other leading edge tech firms, including an aerospace manufacturer to help colonize Mars.

So when Musk last week unveiled Tesla Energy and its line of lithium-ion batteries to power homes and businesses, the reaction from investors and shareholders was positive.

Tesla Energy batteries for businesses and utility companies Patrick T. Fallon/Reuters

Tesla Energy batteries for businesses and utility companies are pictured providing energy for the Tesla Motors Powerwall Home Battery event in Hawthorne, Calif., on Thursday.

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