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This forum is about wrong numbers in science, politics and the media. It respects good science and good English.

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Re: Where does wind energy come from?

The turbine operation is basically governed by Bernoulli’s equation. If you do a web search for, say, “wind turbine efficiency” you will find many relevant articles. An interesting outcome is that turbine efficiency cannot exceed a certain limit (the Betz efficiency) which is 0.59.