Efficient wind turbines in cities
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Create a huge cone shaped Helium balloon with a big funnel like opening in the center. Now place a wind turbine in its center to generate electricity, tie this structure to ground and release it up at a very high altitude to get high-speed winds. Ropes should be tied in such a way that the concave side of the balloon faces the direction of coming wind.
The Concave shape will trap more wind and will result in greater efficiency of turbine. At high altitude there is more wind (look at kites). No need of high (expensive) towers and can be easily placed in cities.