Director of Wind Power, Andrew Newbold, whose company is behind the $220 million project, said it was disappointing vandals would attack the expensive equipment.

Mr Newbold said the devices installed to assess the feasibility of Bald Hills for wind power generation.

It appeared wires holding the equipment in place had been cut with bolt cutters or a hacksaw, but he thought the damage could be repaired.

Mr Newbold said the monitoring stations were about two to three kilometres apart and about four kilometres from the town of Tarwin.

There has been strong community opposition to the proposed Bald Hills wind farm.

Federal Environment Minister Ian Campbell became mired in controversy in April when he rejected the proposal, claiming it could harm rare orange-bellied parrots.

Senator Campbell agreed to reconsider the project after Federal Court action by the Victorian government and Wind Power.

Mr Newbold said police were investigating the crime, but he did not think locals who opposed the project were behind the vandalism.

"You would like to think that this sort of thing wouldn't occur because of that," he said.

He said the wind farm proposal would go back to senator Campbell in September.

Mr Newbold also attacked a policy from the Victorian Greens to campaign against the wind farm in the lead-up to the November state election.

"It is a bit puzzling. Our assessment is that it is sort of local politics," he said.

The monitoring equipment would not be replaced as enough data on wind conditions had been gathered, Mr Newbold said.