Several “wind farms” already exist in Britain and other European countries. Each farm is a group of machines which turn wind power into electricity. The idea is popular in America, too. California, for example, expects to get 10% of its electricity from wind farms by the year 2008.
The problem at the moment is money. It's very expensive to develop and build wind farms. That's because they have to be in high places near the coast or on islands. This makes their electricity expensive, too. But in the future, electricity from fossil fuels and nuclear power will begin to cost more and more. Perhaps then wind farms won't look so expensive after all.