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A nuclear power plant large enough to power a city fits on a small area while wind farm with enough power to power a city would be impractically large. The environmental effect of devoting that much space to wind farms around every major city would be disasterous.
Also, you can't have your power grid depend on a power source thatyou have no control over. On a still summer day, the air conditioners would fall dead. If you want to use massive banks of batteries to store energy for low-wind days, nuclear is far better for the environment.
Wind is cute for some things, but it is bad for the environmnet and impractical for large scale power generation.