How fast do the blades turn?
The blades rotate at anything between 15-50 revolutions per minute at constant speed. However, an increasing number of machines operate at variable speed. For example the bigger turbines of the Te Apiti wind farm have a rotor speed of 20 rpm while in contrast smaller turbines such as the 225kW wind turbine in Brooklyn (Wellington) turn at a much faster rate of up to 40-45 rpm.

For more technical information: see the NZ Wind Energy Association's factsheet on wind energy or have a look at the very informative wind energy website of the Danish Wind Industry Association

 
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