Iowa State University researchers are testing wind turbine towers that stretch about 400 feet in the air, pushing turbines as high as 801 Grand Ave., the state's tallest building. (Photo: Contributed/Iowa State University)
January 11, 2016
Several startups are investigating approaches to tapping wind energy at high altitudes. Altaeros Energies, for example, is building wind turbines inside helium gas-filled industrial blimps that are tethered to the ground to generate electricity.
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January 8, 2016