Wind Turbine Success February 2009 Donaldson Company, Inc. Reference: STLE Handbook on Life Factors for Rolling Bearings (1992) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Filter Rating (Beta = 200) 0 2 4 6 8 10 12 14 Relative Life NASA/STLE Bearing Life Factor Estimated Wind Turbine Bearing Life Increases Current 10 um Northern US Wind Farm Success Story One of the largest renewable energy power utility companies in the

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