Stock photography, photos: Wind Turbine - Boulder, Colorado Stock photos of Wind energy has been the fastest growing energy source in the world since 1990. The Wind Turbine Company developed a 250 kW prototype that has been in testing since May 2000 at the Department of Energy's National Wind Technology Center near Boulder, Colorado. USA Photograph: © Robert Burch Click for a larger image and more information Keywords associated with this stock photo: energy, power, electricity, electric, wind power, wind turbine, wind, turbine