http://www.ecofriend.org/entry/twisted-wind-tower-will-produce-renewable-ener...
Twisted Wind Tower will produce renewable energy for 2000 homes
Eco Factor: Sustainable skyscraper produces renewable wind energy. The rise in the cost of energy and the emissions associated with producing energy the conventional way has forced architects to think about next-gen buildings that can power themselves using renewable sources of energy. British architects David Arnold and Alexa Ratzlaff believe that the roof of a skyscraper is an ideal location to harness wind energy, which can be used to power the building. The architects have conceptualized a spiraling mega-structure that uses this natural form of energy to generate electricity. Christened The Wind Tower, the sustainable structure is aerodynamically shaped to make good use of the prevailing wind currents. The center of the tower includes the main vertical circulation and storage areas. Wrapped around the core are sections that accommodate a variety of programs including commercial, residential, institutional and recreational facilities. The roof of this sustainable tower features 45m tall wind turbines that will generate enough energy to power 2000 residences.