The U.S. Air Force is threatening to halt construction of a 845-megawatt wind farm in eastern Oregon that would be the world’s largest wind project, citing concerns that the wind turbines would interfere with a nearby military radar station and its ability to detect radar images. Rotating wind turbine blades could impart a Doppler shift to any radar energy reflecting off the blades and cause false images or interference. This has impact on the location of future wind farms but issues remain on how to resolve this problem.