The biggest wind farm in the southern hemisphere will be built about 130 kilometres west of Melbourne, powering an estimated half a million homes a year by 2025, if the Andrews government gives the project the green light.

The proposed wind farm would sprawl across 167 square kilometres of farmland near the small town of Rokewood in south-west Victoria, about 40 kilometres south of Ballarat.

It would have 228 wind turbines, each 230 metres tall at their highest point. By way of comparison, just four skyscrapers in Melbourne are taller.

The largest operating wind farm in Victoria, at Macarthur, has 140 turbines that are up to 140 metres high.