The Middelgrunden offshore wind farm has only 20 wind turbines, yet generates enough energy to power 20,000 Danish households annually. They have some of the biggest wind turbines (102 meters tall) as shown in the photo at the top of a man standing next to one of the blades. It's located about a mile offshore. Although siting wind turbines offshore is a little more costly, it is much more efficient (93%) because the surface of the water is much smoother and there is less turbulence due to less temperature variance. The average wind speed is about 16 MPH.
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