Savonius turbines have great advantages:
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low tip speed ratio (TSR) which make them a friend of bats and birds;
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they are particularly suitable for AWES where they have proven themselves with Magenn Power, combining generating torque with lift by Magnus effect;
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AWES and Savonius turbines are suitable in remote areas.
For these and other reasons both AWES and Savonius turbines are the future of wind energy.