http://youtu.be/ww_Y10sVboU

The Makani Airborne Wind Turbine is a tethered wing that generates power by flying in large circles where the wind is stronger and more consistent. It eliminates 90% of the material used in conventional wind turbines, and can access winds both at higher altitudes and above deep waters offshore — resources that are currently untapped. Our goal is the utility-scale deployment of airborne turbines in offshore wind farms.