Huffington Post   ThienVinh Nguyen   First Posted: 03/18/10 06:12 AM ET   Updated: 05/25/11 03:20 PM ET

University teams from around the world are busy constructing sustainable houses at this year's U.S. Department of Energy's Solar Decathlon competition. 20 teams were selected to come to the National Mall in Washington D.C. to compete against one another in designing, building, and operating the best solar-powered, energy-efficient house. The houses are judged based on 10 competitions, which range in point value, from architecture to lighting design to comfort zone. Check out the houses we've featured and vote for which one you want to call home!

Penn State's Natural Fusion House
With 92 members from a number of disciplines and fields, this is Penn State's second time in the competition. The Team set out to maximize daylight with their design. Their roof uses a new technology called " Green Roof Integrated Photovoltaics," which combines the typical solar energy system with plants, which help remove heat from the roof. Also, most of the materials used were either made from natural and/or recycled products. Construction costs: $250,000-$450,000.
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(Photos via Flickr: A. Siegel and Dept of Energy)



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