Most of our energy comes from non-renewable energy sources, like fossil fuels. Eventually these sources will run dry.

A wind turbine chnages the wind energy into more useful forms, usually electricity. A wind farm is a collection of wind turbines in the same location generating wind-powered electricity.

Horse Hollow Wind Energy Center, in the USA, is the world's largest wind farm it operates 421 wind turbines and has a capacity of 735 megawatts.

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