Over the past several years, wind farm developers have been facing increasing complaints about wind turbine noise. After many years of successfully placing turbines in proximity to homes in farm and ranch country, where typical setbacks of 800 to 1,200 feet, and noise levels of 50dB or more, were well tolerated, wind energy companies are finding that residents in rural areas in the upper Midwest and Northeast are far more likely than farmers and ranchers to respond negatively to turbine sound of 40dB or even less. For some in areas where nighttime ambient noise levels are low, any audible noise is found to be intrusive, creating a challenging new reality for wind energy to come to grips with.