Skip to content Skip to footer

Windmill sound Kills.

During the operational stage of a wind farm, low frequency sound is produced when the blades are spinning. As a turbine operates, vibrations inside the nacelle (the housing that contains the generator, gearbox, and other parts) are transmitted down the main shaft of the wind turbine and into its foundation. These vibrations then propagate into the water column and seafloor. The sound is primarily below 1 kHz (generally below 700 Hz), with a source level of 80-150 dBre 1 ┬ÁPa @ 1 m. Aerodynamic noise produced by the rotor blades may also enter the water through an airborne path. Sound levels increase slightly as wind speed increases. The type of wind turbine foundation will also affect the transmission of underwater sound.