discrete power profile that consists of 18 P-Q variants for each. The neutral atmospheric stability assumption discussed above is reasonable when the hourly mean wind speed at a height of 10 m exceeds 10 m/s where turbulent mixing overpowers atmospheric instability. power output of the WFs under changes in wind speed, the WT. Kettle, Unexpected vertical wind speed profiles in the boundary layer over the southern North Sea, Journal of Wind Engineering and Industrial Aerodynamics, 10.1016/j.jweia.2014.07.012, 134, (149-162), (2014). From 100 m to near the top of the atmospheric boundary layer the power law produces more accurate predictions of mean wind speed (assuming neutral atmospheric conditions). Between 20 m and 100 m both methods can produce reasonable predictions of mean wind speed in neutral atmospheric conditions. With this approach the wind generation profile can be modelled closely and. Wind speed patterns can be depicted as a wind speed spectrum. However, due to the sensitivities, no calculation can replace on-site wind measuring campaigns. The log wind profile is generally considered to be a more reliable estimator of mean wind speed than the wind profile power law in the lowest 10–20 m of the planetary boundary layer. From that an efficiency field in dependence of wind speed and wind direction. distribution of wind direction wind shear (profile) We are providing information on those dimensions and tools for basic yield calculations. The equation to estimate the mean wind speed ( u z.