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  1. bigger blades more power.

    Probably power is proportional to blade length squared, ie, proportional to the area swept by the blades.

    Eg, GE 3.5 MW has swept area of 9677 m²
    GE 1.5 MW has swept area of 3904 or 4657 m² (2 different models)

    .

  2. The site below has a great, comprehensive overview of all things wind. It has an answer on almost any question about size, placement, speed, etc.

what is the correlation or formula for wind power generated by turbines and their size?

in other words how big does a turbine have to be to generate how much power?