The Coalition has confirmed they will not fund the project after appearing to announce they would fully fund the transmission line on Wednesday.

One Coalition frontbencher said supporters of the project had "stretched" an announcement on the project.

In an interview with The North West Star in Mount Isa yesterday, Opposition infrastructure spokesperson Barnaby Joyce said the Coalition would not fund the transmission line.

"We are fully supportive of trying to make sure this line gets built. It's $1.7billion dollars but let's be honest, we're not funding it. That's something people should clearly understand," he said.

Sen Joyce's comments directly contradict an announcement by Liberal National Party (LNP) senator Ian Macdonald.

A press release from his office said "the Coalition has today promised to fund the $1.7 billion Clean Energy Corridor".

LNP candidate for the Townsville-based seat of Herbert, Ewen Jones, also issued a press release announcing he had secured funding from opposition energy and resources spokesperson Ian Macfarlane for the project.

Mr Macfarlane actually announced that the transmission line could apply to a new fund the Coalition would set up to fund renewable energy projects.

"What I announced was the CopperString project would be eligible under our $3.2billion direct action plan. But there's not guarantees (it would be successful)," Mr Macfarlane told The North West Star yesterday.

"Supporters of the project have stretched what I said," he said.

"We understand it's around $100million (that the project could receive) and on that basis it's well within the possibilities of this scheme."

Neither Sen Macdonald's or Mr Jones' press releases mentioned Mr Macfarlane's $100million funding figure nor that the project would have to apply to secure funding under a Coalition Government.