The minimum speed for a wind turbine to begin producing usable electricity is called the cut-in speed. This speed is typically between 7 and 10 miles per hour. There is also a start-up speed, rated speed, and cut-out speed. The start-up speed is the speed that the wind must be moving to make the turbine rotate, and the rated speed is the wind speed that is safe for use. The cut-out speed is the speed at which the turbine begins to brake because it is not safe for the turbine to be moving any faster.
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