Pumping air upwind

To the Editor:

Windmills only work when the wind is blowing.

Almost all users of electricity require a continuous, or at least a predictable, supply of the stuff.

There is no practical way of stockpiling electric power in large quantities. Batteries work, flywheels work, but only for small quantities. Pumping water upstream works if you are running a hydro plant, but you can't pump air upwind.

Therefore, whenever you build a windmill farm, you also have to build a conventional backup power plant of equal capacity.

If you have a choice between building one plant or building two plants to accomplish the same thing, has anybody noticed that you could save money by only building one plant?

Pierre Berube

St. Johnsbury, Vt.

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