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2009 Solar Decathlon | by Dept of Energy Solar Decathlon
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2009 Solar Decathlon

Student Henning Zimmer of Team Germany, sets the last solar panel on his team's house during the 2009 U.S. Department of Energy Solar Decathlon on the National Mall in Washington, D.C., Monday, Oct. 05, 2009. (Photo by Stefano Paltera/US Dept. of Energy Solar Decathlon)

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Taken on October 5, 2009