While most eco-friendly buildings try to cut down or supplement their power consumption, there have yet to be any buildings that go so far as to generate more power than they consume. Not so with the Masdar Headquarters in Abu Dhabi, the world's first positive energy building. It will even generate power for its own assembly, as the first thing to go up will be a solar roof pier that'll gather juice as the rest of the structure goes up.
Costing $300 million to construct and sporting 1.3 million square feet of space, the building will be the centerpiece of the eco-friendly Masdar City, which is a $22 billion development outside of Abu Dhabi. The techniques it uses are pretty radical, but hopefully we'll see more positive energy buildings sprouting up soon enough.