Rotor blades vary in size and the amount of energy they can generate increases as the area of the swept rotor expands. A typical turbine with a 600kW generator would normally have a rotor diameter of 44m. However, it can vary from 39 to 48m for that size generator. If you double the diameter of the rotor, the swept rotor area would be four times larger which corresponds to four times as much power created.
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