The company will be supplying 111 V90 1.8/2.0MW turbines. The 206MW, 111 turbine on-grid Collgar farm, located near Merredin, 257 km east of state capital Perth, is a joint venture between Investec Bank and Windlab Systems.
Collgar is due to be completed by mid-2012 although the first turbines will be on site by the third quarter of this year.
Last week the project overcame a final hurdle after the state government agreed to a 15-year power purchase agreement with state-owned energy retailer Synergy.
Vestas' Collgar contract comprises a 10-year service agreement and Vestas' Scada system.
According to Windpower Monthly's Market Status Report, Australia's new renewable energy target (RET) has been accompanied by a substantial rise in wind project proposals, but the rate of increase in installed capacity eased in 2009.
Recession-exacerbated difficulties, such as securing power supply contracts needed as a prerequisite for obtaining finance, a massive and cheap non-renewables sector and political indecision over carbon emissions trading legislation, are marring wind's otherwise leading position in the Australian renewables market.