Terracon was contracted by Basin Electric Power Cooperative to conduct environmental services for a proposed 150 megawatt (MW) wind power facility in Aurora, Brule, Jerauld, Lyman, Perkins, Meade, and Tripp Counties located in central South Dakota. Terracon archaeologists, historians, environmental engineers, biologists, and geologists consulted with and examined records from Federal, State, and local agencies and groups, and conducted site reconnaissance activities for approximately 276,000 acres of potential wind power project locations in central South Dakota. Terracon provided the client with environmental and socio-economic data gathering services, including a Phase I Avian Risk Assessment, a Threatened and Endangered Species Assessment, a Preliminary Cultural Resources Assessment, a Wetland Inventory, a Potential Impact Index, and assessments of air quality, solid and hazardous waste, floodplains, transportation, land use, and biological resources. Utilizing a geographic information system (GIS), potential resources identified during site reconnaissance and records reviews were incorporated into interactive maps for inclusion with the final reports. Based on the information obtained, Basin Electric Power Cooperative was able to more confidently evaluate the business risk of pursuing each potential wind energy project site. The information gathered by Terracon will be included in an Environmental Impact Statement for wind energy development in South Dakota.