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Exhibit 11-6

Horizontal-Axis and Vertical-Axis Wind Turbines

An energy-generating windmill has 15 components—Blades, Rotor, Pitch, Brake, Low-Speed Shaft, Gear Box, Generator, Controller, Anemometer, Wind Vane, Nacelle, High-Speed Shaft, Yaw Drive, Yaw Motor, Tower. The wind turns the rotor blades; this motion spins a drive shaft that in turn spins the turbine of a generator to make electricity.

For more information on this exhibit, please contact the Comptroller’s Data Services Division at 512-463-4900 or at P.O. Box 13528, Austin, Texas 78711-3528.

Source: Alliant Energy.

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