Andrew Eubanks gets a bit choked up when he talks about the work being done by the Solar Decathlon team at the University of Tennessee at Chattanooga. As an entrant in the inaugural Orange County Sustainability Decathlon, the 20-member team’s first challenge is to design and build—in the Engel Stadium outfield—an 1,800-square-foot, energy-efficient house. The second is to break it apart and send it to California for the October competition.