Engineering students from the University of Colorado won the Solar Decathlon, which pitted 18 teams in tasks designed to show off solar power prowess.
The teams built solar cars and built houses and were judged in ten areas, including architecture, dwelling, documentation, comfort zone, appliances, an ability to deliver hot water, lighting, energy balance, communications and documentation.
Cornell, Cal Poly, and Virginia Tech came in second, third and fourth respectively. The contest was sponsored by the Department of Energy. Earlier in the year, the University of Michigan won a race across America with solar race cars.