I've noticed that some of the original wind turbines in southwest Minnesota have been retro fitted with some new turbines in recent years. Not sure but the original ones have to be close to 20 years old. They seemed to have a relatively bad track record of breaking down originally. We would notice that maybe some 10% would not be turning when the rest of the fields were turning.
The wind always blows in southwest MN. A day without wind is unusual. The new ones today (they are continually adding new fields) seem to be more reliable and we seldom notice turbines not turning.
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