What's got SolarCity stock set as Friday's chart of the day? The company's ambitious expansion plan that stretches through Arizona, California, New York, Delaware, Maryland, Nevada and Massachusetts. Yesterday, shares spiked for five percent, but SolarCity may not be done there. While it has competition on public markets coming in the form of Vivint Solar, the company's stock has appreciated an eye-popping 500 percent since its late 2012 debut. As long as more U.S. homes keep adopting solar power, it isn't likely the company's forecast losses for 2014 will be repeated any time soon.