How long does it take for a wind turbine to pay for itself?

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How long does it take for a wind turbine to pay for itself? I was driving through south Texas and they seem to be sprouting up like trees. My friend and I guessed that they would pay for themselves in 5-10 years. How close are we to being correct?
John Rowen
John Rowen, former Aerospace Engineering Specialist/Technician at General Electric (1980-1995)