Opponents will have "one last chance" to scrap controversial plans for a £500million incinerator at a Gloucestershire County Council meeting.
A Labour motion to scrap the contracts for the mass waste burner at Javelin Park will be discussed at the meeting at Shire Hall on Wednesday.
Campaign group Glosvain has gathered nearly 7,000 signatures in opposition to the Haresfield incinerator and will demonstrate outside the council headquarters at 9.20am before the debate.
During a UKIP public meeting in Hardwicke, Caroline Stephens, the party's parliamentary candidate for Stroud, said she hoped UKIP would back scrapping the project.
But Councillor Mark Hawthorne, the Conservative leader of Gloucestershire County Council, said such a move would cost taxpayers £100million.
Councillor Barry Kirby was among five Labour council members to put the motion forward.
He said: "I believe this is our last chance. If councillors do their jobs properly they will listen to their residents and vote for the motion. There's so many people against it and it's a slap in the face of local democracy."
Mrs Stephens said UKIP supports local referendums on issues like this. "It's the people who live in the area who we need to consult," she said.
County Liberal Democrat group leader Councillor Jeremy Hilton said building the incinerator in Gloucestershire would be a "disaster".
He said: "There are much cheaper and more environmentally friendly ways of processing our household waste.
"The Tories say the cost of cancellation could be £60 million, but they refuse to let opposition councillors have a copy of the contract with UBB.
"Liberal Democrats are demanding a full independent inquiry into the procurement process and the actual cancellation cost. In the meantime the contract must be stopped, until all the facts are known."
Glosvain's Sue Oppenheimer said: "We have been fighting the project for six years. This is a mass movement within the Stroud district against the proposal but we've not been listened to."
But Mr Hawthorne said the process has given opportunities for residents to give their views.
He said: "The Conservatives will be voting against the motion because the Labour proposal to scrap it would cost taxpayers £100million.
"Throughout the process we followed the rules and people have had the opportunity to have their say."
