The average speed of a wind turbine depends on the amount of wind that is blowing the turbine. The minimum wind speed required for the turbine to be cost-effective ranges from 9-10.2 miles per hour (14.4-16.2 kilometers per hour). The maximum wind speed that a turbine can withstand (known as the survival speed) can be anywhere from 112 miles per hour to 145 miles per hour (180.2 kilometers per hour-233.4 kilometers per hour).
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