By DIANE CARDWELL and JULIE CRESWELL
Published: January 3, 2014
The first inklings of the idea came to Elon Musk and a cousin in an R.V. heading to the Burning Man festival in 2004.
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Solar energy, they agreed, could be big.
But not even Mr. Musk, the billionaire behind the Tesla electric car, could have foreseen the solar power craze that is sweeping Wall Street. He and his cousins Peter and Lyndon Rive are riding a wave of exuberance over the industry and their young business, SolarCity.
The company — the nation’s largest provider of rooftop solar systems, with more than 80,000 customers — has not made a dime. And, frankly, no one quite seems to know when, or if, it will.
But SolarCity has captured investors’ imaginations and become a potent symbol of a stock market ascent that makes the vertigo-inducing heights of Twitter seem tame. SolarCity’s share price, which closed at $59.27 on Friday, has soared more than sevenfold since it went public, and the company, which did not exist eight years ago, is valued at roughly $4.9 billion.
Depending on whom you talk to, the rise of SolarCity and similar companies is either a sure sign that solar power is finally having its day or that yet another mania has gripped the markets. Two other companies, SunPower and SunEdison, have also exploded in value. In all, an estimated $13 billion was invested in solar projects in 2013, a tenfold increase since 2007, according to GTM Research, which tracks the industry.
Solar companies have had the wind at their backs lately. The broad stock market is coming off its best year since 1997 — the Standard & Poor’s 500-stock index rose nearly 30 percent in 2013 — and the shares of many young companies have leaped from one high to another.
But few have been hotter than SolarCity, in part thanks to the Musk mystique surrounding Tesla Motors, itse