SN Door Wind Mill is a Vertical Axis Wind Energy Conversion System designed to operate at the lowest possible wind velocity. Horizontally operating wings of the turbine, while being at one side of its axis are pushed forward by oncoming wind and wind concentration principle, while being at the other side release the oncoming wind with the employment of SN Door Device. This device is a simple door unevenly segmented by pivoting it on a horizontal axis bar on its frame to oscillate aerodynamically in a manner that due to uneven segmentation and the larger segment at the wind receiving side having been provided with means to limit its oscillation only towards one side, it engages and releases the oncoming wind at every alternate semicircle automatically. Angularly supported pillar instead of a tower, a ground based energy conversion system which reduce the erection cost and increase the strength of turbine to withstand any eventuality and the resultant simplicity of engineering back up for development and erection are other features of the invention.
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