23 October 2014. The BAT (buoyant airborne turbine) is a kind of giant tubular helium balloon with a three-bladed turbine inside, floating as much as 2,000 feet in the air so it can capture energy from winds. BAT air turbine is a robotic airship being developed by Altaeros Energies, a company founded in 2010 at the Massachusetts Institute of Technology. The system is designed to deliver energy to a ground station via one of the cables that would tether the balloon to Earth.




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