The Hallett 4 windfarm will consist of 63 x 2.1MW S88 V3 wind turbines from Suzlon Energy Australia Pty Ltd, and is situated 220 km north of Adelaide and immediately north of the Hallett 1 windfarm, which was commissioned in June 2008.

The long-term average wind speed at Hallett 4 is estimated to be greater than 8.5 m/s, similar to the wind conditions prevailing at Hallett 1 and at the Hallett 2 windfarms.

AGL has entered into a turnkey engineering, procurement and construction contract and supply agreement with Suzlon for the project. AGL also has further options with Suzlon to construct either the Hallett 3 or Oaklands Hill windfarms at average turbine prices similar to those for Hallett 4.

Hallett 4 is forecast to have a total development cost of approximately A$341 million over two years.

AGL will retain all electricity output and green credits as well as full operational and management responsibility for the windfarm. A final decision on long-term ownership structure is anticipated during 2009.