About 200 megawatts of Australia's power now comes from wind farms, so the new Alinta and Pacific Hydro projects will massively expand this output.

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Another renewable energy producer, Pacific Hydro, is building an even bigger farm at Portland, on the coast of the southern Australian state of Victoria.

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Pacific Hydro expects its farm will save 700, 000 tonnes of emissions.

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Pacific Hydro already runs Australia's largest wind farm, a 35-turbine, 52-megawatt development that is spread over a number of grazing properties at Ararat in western Victoria.

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According to Pacific Hydro, wind is the world's fastest growing energy source, with installed capacity over the five years from 1998-200 growing at an average 32 percent a year.

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