The climate of the chosen location for the wind turbines has a significant impact on their energy output. Whilst wind turbines are usually installed in high wind areas, seasonal variability in wind availability and strength will influence the energy output of a turbine. An on-shore site was selected for the location of the wind turbines in this study, on the south-west coast of Victoria, Australia (latitude 37.38S). This site was chosen to reflect the typical conditions within which most Australian wind farm developments would occur. The average annual wind speed for this site was 7.75 m/s. The annual gross energy output of the wind turbines was calculated using the hourly wind data of the chosen location and characteristic power curve of the two wind turbines. Capacity factors of 34% and 33% for the 850 kW and 3.0 MW systems, respectively, were also used. Reduced operational efficiencies over time, due to system wear, have not been factored in, assuming uniform performance of the systems over their entire life.