Most of Lancaster County is Wind Power Class 2
http://rredc.nrel.gov/wind/pubs/atlas/maps/chap2/2-01m.html Here is a PA map from 2003:
http://www.eere.energy.gov/windandhydro/wi.../pa_50m_800.jpg While this may be considered 'marginal', two things about Lancaster County are beneficial: 1) Lots of land and 2) Lots of power lines.
Also, the wind maps are only estimates (thus the reason for this study) and are designed primarily around determining utility-grade locations: high-concentration wind farms for maximum profit, meaning more wind = more power at a lower cost. Local or small-scale projects are another story, and it would seem feasible for our area.