WASHINGTON - OCTOBER 07:  Workers complete final preparations on a home designed by a team from the University of Minnesota on the National Mall at The Energy Department's 2009 Solar Decathlon October 7, 2009 in Washington, DC. The Solar Decathlon features 20 university teams building high-tech, high-efficiency solar-powered homes to showcase the latest in green design and technology and 'to promote cutting edge green technology, energy efficiency, renewable energy and green jobs.' Getty Images logo Getty Images 1 month ago

WASHINGTON - OCTOBER 07: Workers complete final preparations on a home designed by a team from the University of Minnesota on the National Mall at The Energy Department's 2009 Solar Decathlon October 7, 2009 in Washington, DC. The Solar Decathlon features 20 university teams building high-tech, high-efficiency solar-powered homes to showcase the latest in green design and technology and 'to promote cutting edge green technology, energy efficiency, renewable energy and green jobs.'