A recent report, The Performance of Wind Farms in the United Kingdom and Denmark, indicated a shorter life for wind turbines than the predicted 20-year life. See March 5 article, Bad News for Wind Energy.
There is a wind farm in western New York State consisting of 67 turbines that have been in operation for around three years.
Recently there have been several units shut down while 10 blades were repaired. If each came from a different turbine it would mean the wind farm was producing 10% less electricity than planned while the turbines were out of service. It could also support the contention that the life of wind farms will be less than planned.
An engineer who worked with me at General Electric witnessed the repair work and provided pictures and a description of the repairs.
When cracks can’t be repaired by using a crane…
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