Pennsylvania has wind supply suitable with utility-scale wind farms. The good and excellent wind supply areas are concentrated on ridge crests in the southwestern part of Pennsylvania, positioned southwest of Altoona and southeast of Pittsburgh.

A renewable resource, airstream is classified according to wind power classes, which are created from normal air speeds. The classes range from Class 1 (the lowest) to Class 7 (the top). Overall, at 150 feet , wind power Class 4 or greater is effective for generating wind energy with big turbines. Class 4 and higher are considered good energy supplies. Specific areas in the Class 3 regions could have greater wind power class values at 80 meters than displayed on the 50 meter map because of potential high wind shear. Because of the improvements in machinery, a number of locations in the Class 3 areas may suitable for utility-scale wind power development.