5 - 15 m/s
The correct answer is 5 - 15 m/s.
Most commercial wind turbines operate most efficiently within a specific wind speed range. While they can start generating power at lower speeds, and some designs might operate at higher speeds, the optimal range for maximizing energy output and minimizing wear and tear typically falls between 5 and 15 m/s. Wind speeds below 5 m/s are often too low to generate significant power, while speeds above 15 m/s can lead to operational limitations or even damage to the turbine due to excessive stress. Therefore, the range of 5-15 m/s represents the sweet spot for efficient operation for the majority of commercial wind turbines.
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