Wind turbines generally need average annual wind speeds of at least 9 miles per hour for smaller (home) installations with larger turbines needing slightly higher wind speeds for efficiency.
The survival speed of commercial wind turbines is in the range of 40 m/s (144 km/h) to 72 m/s (259 km/h). The most common survival speed is 60 m/s (216 km/h).
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