The DOE Solar Decathlon is a program that challenges collegiate teams to design, build and operate solar-powered houses that are cost-effective, energy-efficient and attractive. This year's competition was in Washington, D.C. from Sept. 23 to Oct. 2.
Visitors explore the front deck of the University of Illinois at Urbana-Champaign's entry in the U.S. Department of Energy Solar Decathlon 2011 at West Potomac Park in Washington, D.C., Thursday, Sept. 29, 2011. (Credit: Stefano Paltera/DOE)
Students from the Washington D.C. Metropolitan area tour Team Florida's entry in the U.S. Department of Energy Solar Decathlon 2011 in Washington, D.C., on education day, Tuesday, Sept. 27, 2011. (Credit: Stefano Paltera/DOE)
Brianna Bacon, right, and Lizzie DeLeonibus, left, of Maryland look out over Florida International University's solar thermal collector system at West Potomac Park in Washington, D.C., Wed., Sept. 28, 2011. (Credit: Stefano Paltera/DOE)
The public learns about energy efficient light bulb options in the exhibit tent at the U.S. Department of Energy Solar Decathlon 2011 at West Potomac Park in Washington, D.C., Thursday, Sept. 29, 2011. (Credit: Stefano Paltera/DOE)
DOE Secretary Steven Chu with Jeffrey Tiller, left, with Appalachian State University, and student David Lee, second from left, at the Appalachian State University house. (Credit: Stefano Paltera/DOE)
The 300 block of Decathlete Way illuminates with the houses from Canada, Team China and Illinois, from left to right, at the U.S. Department of Energy Solar Decathlon 2011 in Washington, D.C., Friday, Sept. 30, 2011. (Credit: Stefano Paltera/DOE)
On the final day of public tours, visitors tour the entries of Team New York, back left, Team Massachusetts, front and SCI-Arc/Caltech, right, on the closing day of the DOE Solar Decathlon 2011.(Credit: Stefano Paltera/DOE)
Visitors to the U.S. Department of Energy Solar Decathlon 2011 explore the Department of Energy's Anatomy of a House exhibit in Washington, D.C., Sunday, Oct. 02, 2011. (Credit: Stefano Paltera/U.S. Department of Energy Solar Decathlon)
A energy saving compact fluorescent lightbulb illuminates the living room of Appalachian State University's house as visitors tour the school's entry. (Credit: Stefano Paltera/DOE)
The University of Maryland gives tours on the final open day of the U.S. Department of Energy Solar Decathlon 2011, after taking second place overall in the competition, in Washington, D.C., Sunday, Oct. 02, 2011. (Credit: Stefano Paltera/DOE)
New Zealand's Victoria University of Wellington is open for tours on the final open day of the U.S. Department of Energy Solar Decathlon 2011, after taking third place overall in the competition, in Washington, D.C. (Credit: Stefano Paltera/DOE)
Purdue University's energy efficient house hosts visitors on the closing day of the U.S. Department of Energy Solar Decathlon 2011, after taking second place overall in the competition, in Washington, D.C., Sunday, Oct. 02, 2011. (Credit: Stefano Paltera/
Visitors tour Team Belgium's entry in the U.S. Department of Energy Solar Decathlon 2011 on the final day of tours in Washington, D.C., Sunday, Oct. 02, 2011. (Credit: Stefano Paltera/U.S. Department of Energy Solar Decathlon)
The University of Maryland's entry, which placed first overall, in the U.S. Department of Energy Solar Decathlon 2011 in Washington, D.C., Friday, Sept. 30, 2011. (Credit: Stefano Paltera/U.S. Department of Energy Solar Decathlon)