The eco-friendly B & W solar-powered house you see in the gallery above is the work of scientists from the University of Madrid. It's Team Spain's entry into the Solar Decathlon in Washington, D.C.
The B & W House has a roof equipped with thermal and photovoltaic solar panels; the roof rotates such that it is always in the best position to capture sunlight. At night, the roof rotates to lie flat, thereby reducing wind resistance.
This solar-powered house is expected to produce enough energy to not only power the home, but also donate energy back to the power grid.