The dynamic interaction between the WMass 25 kW wind turbine, WF-1, and the local, turbulent wind field is investigated. The integral length scale for wind speed gusts is found to range from 40 to 200 m. The system i s seen to behave as a low pass filter with a cutoff frequency of 0.03 Hz. Power i n the wind with gust frequencies below the cutoff frequency is available to the wind turbine. This represents approximately 70% of the total power in the turbulence, and about 5% of the total power in the wind. The power extraction is independent
of the wind direction fluctuations when the nacelle yaw is damped.