Wind farms are actually arrays of electricity-generating wind turbines, which are tall, slim towers with two or three rotor blades at the top. The wind turns the blades, which spin a pole. This pole is connected to a generator where the electricity is made. Three can be as few as one and as many as thousands of wind turbines in a single array. Computers monitor the wind direction and speed, and can shut down the turbines if the wind becomes too strong.