Speaking at the SunShot Grand Challenge Summit June 13, Energy Secretary Steven Chu announced the Rooftop Solar Challenge competition to find ways to make rooftop solar energy systems less expensive and provide $8 million to nine small solar businesses to help offset financing and other costs. The SunShot Prize will award a total of $10 million to the first three teams that install 5,000 small-scale rooftop solar systems at an average price of $2/watt or less.