Quick Answer
A minimum wind speed is indeed required before installing wind turbines, typically around 7-10 meters per second (15-22 miles per hour), at a height of 30-40 meters (100-130 feet) above the ground. This threshold ensures the turbine operates efficiently and generates electricity at a reasonable cost. Wind speeds below this level can lead to inefficient operation and increased maintenance costs.
Choosing the Right Site
When selecting a site for a wind turbine, wind speed is a critical factor. A minimum wind speed of 7-10 meters per second (15-22 miles per hour) is generally accepted as the threshold for efficient operation. At this speed, the turbine can start to generate electricity at a reasonable cost. However, some turbines can operate at lower wind speeds, especially those with larger rotors or advanced blade designs.
Wind Speed at Different Heights
Wind speed increases with height due to the reduction in friction and turbulence. At 30-40 meters (100-130 feet) above the ground, wind speeds are typically 1-2 meters per second (2-4 miles per hour) higher than at ground level. This is why it’s essential to measure wind speeds at the proposed turbine height, rather than at ground level. A wind speed of 9-11 meters per second (20-25 miles per hour) at 30-40 meters (100-130 feet) is a more accurate indicator of the turbine’s potential.
Measuring Wind Speed
To determine if a site is suitable for a wind turbine, it’s essential to conduct wind speed measurements. This can be done using anemometers, which measure wind speed and direction. Typically, wind speed measurements are taken over a period of at least 12 months to account for seasonal variations and extreme weather events. A minimum of 6-12 months of data is recommended to ensure accurate results.
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