Windspire: The household turbine from Mariah Power

Recent years have witnessed the discovery of several mini-wind turbines, which, unfortunately, have not been of much use. However, the household Windspire turbine from Mariah Power seems promising.
The Windspire turbine has a propeller-free vertical-axis design, and can generate (in about 11mph wind conditions on an average) 1800 kilowatt hours of power every year. On an average, the power generated by this turbine can take care of around 25% of the typical energy requirements of a household. If one is energy-efficient, he/she can indeed benefit more from the turbine.
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