Energy Secretary Chu kicks off Solar Decathlon in Washington
Members of the Penn State team clean up after building their house in the 2009 Solar Decathlon on the National Mall in Washington on October 8, 2009. Twenty university teams built high-tech, high-efficiency solar-powered homes to showcase "green" design and technology. The U.S. Capitol can be seen in the background. UPI/Roger L. Wollenberg
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