This week Inhabitat reported live from the scene of the Solar Decathlon in Madrid as 17 stunning solar-powered houses competed for the title of the world's most energy-efficient prefabricated house.

ENGADGET: Inhabitat's Week in Green: a US team wins the Solar Decathlon!

Mr. Lutz, who is the co-director of the sustainable-design program at the University of Minnesota's architecture school, liked the fact this house was prefabricated, thus requiring less energy and resources to build.

WSJ: Minneapolis Luxury Real Estate: A Big Version of a 'weeHouse'