How much power can you get from a windmill? | Windmills have long been used to pump water from wells, and are now
being used to generate electricity on a somewhat wide scale. The most efficient
windmills are a little under 50% efficient, and it is physically impossible
to exceed 59%. For an excellent windmill (50% efficiency) the power available
is given by the following formula:
where the Most wind systems are designed to produce The formula is an overestimate for all but the very best wind turbines. For example, one popular 1-kW unit produces only half as much power as the formula predicts. |

Example |
## How much power will be produced by a very high quality windmill whose diameter is 7 meters (about 20 feet) when the wind velocity is 5 meters per second (about 11 miles per hour)?##
Note: The
<== The answer |

California ... | California has some huge windmills ---some 3200 of them --- covering mountain sides in their windy areas. (Tehachapi, Altamont Pass, San Gorgonio) All together, they produce --- at a rare full wind --- about 300 MW, which is about 1/4 as much power as a moderately large nuclear power plant produces, and is less than 10% of the electricity the small state of Connecticut consumes. |

Learn More | Ths Solar Fraud has a full chapter and part of an appendix devoted to wind turbines. |

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