The climate change sceptic the government asked to review renewable energy targets denies his views coloured his work.
Critics of Dick Warburton say the findings of his RET review, released on Thursday, were always going to be distorted.
But Mr Warburton said the government's hand-picked review panel left the political side of things to the politicians.
He insists his personal views on climate change and history as chairman of Caltex Australia had no bearing on the work.
"It had no bearing on the terms of reference and it had no bearing on the report," he told ABC radio.
"We went into this with a completely open mind."
The review panel recommended amending the scheme by either closing the large-scale component to new investors like wind farm operators or by setting targets based on electricity demand.
It also called for the outright abolition of the small-scale RET scheme.
The clean industry sector warns these suggestions would gut future investment in renewables in Australia, damage the $10 billion already committed and put 21,000 jobs at risk.
Mr Warburton said that was an "extreme exaggeration" of the situation.
"You've got a very significant oversupply of electricity into a slowing demand of electricity and there is just no justification for spending this sort of money," he told ABC Radio.
"We don't believe that there needs to be a large scale of renewables being made into the market at a time when there is so much supply."
Climate Council slams RET review panel
But the Climate Council's Tim Flannery has slammed the review, insisting that the findings are biased and have no 'scientific basis'
"For a panel lead by someone that has lack of understanding of the scientific basis of climate change the results are hardly surprising," he said in a statement.
"Clearly the process has been highly flawed... unfortunately a Panel was convened with a number of people with a well-known history of working closely with the fossil fuel industry."
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