The USGS has release a Wind Farm Mapping Application, which allows users to access the more than 47,000 individual wind turbines contained within the national wind turbine database.  You can filter data by total height, capacity, and blade length and also download the wind energy data.

The purpose of the project was to provide a publically available, spatially referenced, national dataset of onshore wind turbine locations and their corresponding facility information and turbine technical specifications. The project compiles wind turbine information from the Federal Aviation Administration (FAA) Digital Obstacle File, as well as other manually digitized turbine locations.