Areas with high potential for utility-grade wind power were based on wind energy adjusted to 80 m and excluding protected areas and land-cover types unsuitable for wind installations (Elliot et. al. 1986, NREL 2010). Data were originally in classes, 3-7, but were assigned 1/0 values for this dataset, and then averaged to create a 10 km2 grid. See citations for details on raw data. Elliot, D. L., C. G. Holladay, W. R. Barchet, H. P. Foote, and W. F. Sandusky. 1986. Wind Energy Resource Atlas of the United States. Pacific Northwest Laboratory, prepared for the U.S. Department of Energy, Richland, Washington. NREL [National Renewable Energy Laboratory]. 2010 wind data: wind power class (exclusions applied). U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, Golden, Colorado, USA.