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Exhibit 11-4

Horizontal-Axis and Vertical-Axis Wind Turbines

There are two main types of wind turbines, the horizontal-axis and vertical-axis models. Most modern wind turbines have a horizontal axis, with blades resembling airplane propellers. Vertical-axis units have blades that resemble an eggbeater’s.

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: American Wind Energy Association.

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