Areva M5000 monster windmill.
Design life time 20 years
Cut-in wind speed 4 m/s Rated wind speed 12 m/s Cut-out wind speed 25 m/s
5 MW at an average of 25% capacity factor = 1.2MW.
This is the average power output of those monster wind mills.
I did not find the price tag of those windmill, but I am quite sure the energy from those will not be "Free".
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