The development of what would be the southern hemisphere's largest wind farm hinges on a survey in the small Tasmanian community of King Island.

Residents and land-owners will vote yes or no to the proposal to build the 200-turbine wind farm, which would play a huge role in helping Australia meet its renewable energies targets.

Hydro Tasmania says the the farm will bring hundreds of millions of dollars into the local community, as well as infrastructure upgrades and at least 60 jobs.

Each of the turbines, designed to take advantage of the Roaring Forties, will be 150m tall from the base of the turbine to the tip of the blade.

But the local community, with a population of 1,500, has to give the project its stamp of approval - something that is far from assured.

Hydro will send out surveys on Friday to gauge the level of community support before it goes ahead with an $18 million feasibility study.

It says it wants 60 per cent approval from the local community.

Jim Benn from the group No Tas Wind Farm says while he opposes the project, it is important all residents have their say.

"Big wind farm infrastructure is probably inappropriate for King Island, considering the size of our island... they're going to take up about 40 per cent of that land area," he said.

"We have to be able to work together and live together, there's only 1,500 of us."

About 100 people attended the final community forum on King Island yesterday to discuss the farm.

One attendee told the ABC she has an open mind about the wind farm.

"I think it would be a terrible shame if we didn't investigate this at least - for me there are a lot of possibilities," she said.

Another told the ABC that the prospect of the wind farm is "scary prospect" for such a small community.

"It is such a passionate subject because we are an island and we're small," she said.

"It's a scary prospect for us. A lot of people don't like change."