Old windmills wouldn't particularly store energy. For example they would only grind grain when the wind was blowing.
Or they would pump water into a tank when the wind was blowing.
Modern windmills generally generate electricity. For commercial windmills they are attached to the "Grid" which they treat somewhat as a battery. There still is risk of uneven power generation which would need to be evened out with either a storage method (some have suggested using battery powered automobiles as a "battery bank", or used with a complementary generation system that could be easily varied. For example hydro-electric may allow some diurnal variation in generation. It could still be a problem if there were many days of very high or very little wind.
Off grid systems are usually connected to some kind of a charge controller and then dumped into a battery bank. There is a risk of overcharging the batteries, and it is suggested to have some kind of a "dump load" such as an electric heater that can waste excess electricity without disconnecting the windmill from a "load device".
Windmills use wind energy.
older windmills make more energy than newer windmills
A windmill runs off of the energy that the wind provides. The wind blows against the blades of the windmill and turns them, causing them to turn a turbine. This turbine converts wind energy to kinetic energy, something that we can store and harness.
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Usually no, but they can be used to raise water into a reservoir which is stored potential and can be used in a hydro plant at a later time.
Energy cannot be stored!
Windmills use wind energy.
older windmills make more energy than newer windmills
Windmills transform the kinetic energy of the moving air mass into other energy forms.
A windmill runs off of the energy that the wind provides. The wind blows against the blades of the windmill and turns them, causing them to turn a turbine. This turbine converts wind energy to kinetic energy, something that we can store and harness.
windmills are there to help save energy and renew electricity.
Mechanical energy
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windmills spin causing movement and a mechanism harvests the movement and turns it into energy.
They build windmills to generate 'clean and ecofriendly' energy.
Usually no, but they can be used to raise water into a reservoir which is stored potential and can be used in a hydro plant at a later time.
Kinetic