WASHINGTON - OCTOBER 07:  Workers complete final preparations on a home designed by Team California on the National Mall at The Energy Department's 2009 Solar Decathlon October 7, 2009 in Washington, DC. The Solar Decatholon 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 28 months ago

WASHINGTON - OCTOBER 07: Workers complete final preparations on a home designed by Team California on the National Mall at The Energy Department's 2009 Solar Decathlon October 7, 2009 in Washington, DC. The Solar Decatholon 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.'