As part of its research and development program for development of renewable energy sources, Southern California Edison has monitored the acoustic emission of several different horizontal and vertical axis wind turbine generators with power generation capacity ranging from 80–500 kW. Noise measurements included: frequency spectrum (infrasonic through audible range), directivity, nearfield and farfield, and short and long duration. This presentation will summarize the results of the tests and measurements of both vertical and horizontal axis wind turbines.