1 Power in the Air

The Vestas V90 3MW wind turbine has a rotor diameter of 90 meters and is rated at 15 meters/second.

• At sea level with wind speeds of 15 meters per second, what is the power in the wind in the swept area of the blades?
• What is the efficiency of the wind turbine at its rated speed if it generates 3 MW?

2 Scaling

If the wind speed doubles, what happens to the power?

3 Altitude

Does the power in the wind raise or lower with altitude and why?