SunPower Corporation is an American energy company that designs and manufactures crystalline silicon photovoltaic cells, roof tiles and solar panels based on a all-back-contact solar cell invented at Stanford University. The company is owned 66% by Total, Europe's third largest oil company, and is publicly traded on the NASDAQ as SPWR (formerly SPWRA and SPWRB); it is a component of the Dow Jones Oil and Gas Index DJUSEN.