Billions of dollars worth of investments in the clean energy sector are at stake if the Coalition wins the federal election in September.

The Coalition is vowing to scrap the carbon tax, review the renewable energy target and axe the $10 billion Clean Energy Finance Corporation if it takes Government.

As the largest owner of installed wind energy capacity in Australia, the company Infigen says the current level of uncertainty is playing havoc with some big investments.

"It's a problem that's been in our industry for a number of years because it's the first time legislation's been reviewed or tinkered with," Infigen's executive director Miles George said.

"Now we have a prospect of a change of government, that uncertainty will remain until there is a change of government and a further review of the renewable energy target.

"So yes, at the moment investment is pretty much stalled in the industry."

Mr George says Infigen is yet to decide if it will go ahead with up to $2 billion worth of potential investments.

"We have a number of projects in our development pipeline but we won't be progressing any of those until there's more certainty about the legislation," he said.

"It's very frustrating. Frustrating for our investors, frustrating for our capital providers for the sector, but it's also frustrating given that the renewable energy target legislation has actually been very effective."

Clean Energy Finance Corporation told to shelve contracts

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The Coalition has already promised to dump the $10 billion Clean Energy Finance Corporation.

It was set up to lend money to firms delivering clean energy and low emissions, to give them a kick-start in the market.

The Coalition is now warning it to stop drawing up contracts for new projects until after the election.

"The Clean Energy Finance Corporation sadly spends $10 billion of taxpayers' money which is borrowed for speculative ventures which the private sector won't support and at the end of the day there is no additional renewable energy whatsoever," Opposition environment spokesman Greg Hunt said.

"So for those reasons we won't proceed with it."

Reserve Bank board member Jillian Broadbent, the chair of the Clean Energy Finance Corporation, says she is disappointed with the Coalition's plans.

"There's a lot of confusion about what we are and what the working model is and what kind of costs we're going to be to the taxpayer, because on our numbers we're going to be financially self-sufficient in probably within the first two years of our operation," she said.

"Then you start generating dividends which go to the Australian Renewable Energy Agency which can save the Government putting funds into that agency directly."

The fund is currently considering applicants from at least 50 low carbon and low emission companies with contracts worth up to $2 billion.

It plans to start issuing those contracts on July 1, despite calls for them to be shelved until after September.

Fund has 'obligation to fulfil responsibilities'

Ms Broadbent says shelving the contracts is not possible.

"We have an obligation to fulfil those responsibilities and that's what we're doing," she said.

"I liken it to if the Opposition had a policy to withdraw the troops from Afghanistan in September and you're asking the soldiers to put down their weapons now. I mean, you've got a responsibility to fulfil what you've been asked to do, until there is a change of Government."

Mr Hunt disagrees.

"Any comparison between borrowing $10 billion to speculatively invest and the magnificent work of our troops in Afghanistan is utterly inappropriate," he said.

Meanwhile, the Federal Government which set up the fund, remains committed to it.

The parliamentary secretary for Climate Change Yvette D'Ath says the Clean Energy Finance Corporation has a guaranteed future if Labor is re-elected.

"These businesses have to meet very strict investment guidelines and criteria to get that finance through the Clean Energy Finance Corporation," she said.

"So we're very confident that there'll be that rigour, there'll be that transparency and that this will attract a lot of investment in Australia to invest in renewable energy."