The 95MW, $236-million facility would be built next to AGL's existing 180MW gas-fired power plant, the company said this morning.
Construction would begin in September. Commissioning is expected in December next year.
The 45 turbine farm would be bigger than the plant that currently holds the title of Australia's largest wind farm, the 91MW facility 500km away at Wattle Point, South Australia, which AGL bought in its takeover of Southern Hydro late last year.
AGL managing director Greg Martin said Hallett was an ideal place for a wind farm, offering one of the largest wind resources on the mainland close to a high-voltage electricity transmission system.
"The Hallett wind farm will help AGL meet its commitment to increase the amount of electricity generated from renewable sources," Martin said.
"The strategic location at Hallett will also enable the development of an integrated gas-fired power plant and wind farm facility to ensure continuous operation during periods of high electricity demand."
