Most wind capacity in the United States is designed for a medium wind speed environment
Most wind capacity in the United States is designed for a medium wind speed environment Most wind turbines in the United States were designed for medium wind environments, according to data collected in the U.S. Energy Information Administration's (EIA) Annual Electric Generator Report. Wind design classes, as defined by the International Electrotechnical Commission (IEC), range from Class 1 (high wind) to Class 4 (very low wind).