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Early uses of wind energy was generally for direct mechanical actions such as grinding or pumping. Hence the term windmill to indicate a wind powered mill.

However, virtually all modern windmills generate electricity.

It is likely that most future windmills will also be coupled to electricity production.

It is unlikely that wind energy will become the only energy source available, in part because of its somewhat unpredictability and tendency to have variations of power levels not connected to grid requirements.

There would be benefits of connecting wind energy to energy sources like hydroelectric power generation. When the wind is blowing, there would be less need for hydroelectric, and the water could be stored to some extent like a giant battery. When the wind stops, the hydroelectric energy would be used.

Another form that it could be coupled to is automobile charging... it is a little tricky because of the irregular nature of the wind energy, but perhaps by either charging a secondary battery bank, or counting on a strong nocturnal breeze it would work. Some people have suggested that auto batteries wouldn't actually need to always be "topped off", but rather they could be used to some extent as a reservoir to ameliorate peak energy uses.

Hydrogen is a form of electric energy storage that wouldn't necessarily need continuous inputs, and may someday be used in conjunction with automobile fuels.

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