The coalition denies delays in reaching a position on climate change will lead to business groups being more closely aligned with government efforts to reduce emissions.
Weeks before Labor is set to unveil its 2035 emissions target, a Business Council of Australia report found a target of cutting emissions by 70 per cent would need capital investment of $530 billion.
The coalition has yet to announce a formal position on emissions reduction and Opposition environment spokeswoman Angie Bell said modelling had not been done as part of its policy review.
Ms Bell said the opposition was "methodically" going through detail for its emissions policy, but denied suggestions the long time period to reach a decision signalled uncertainty to groups such as the business community.
"Business and industry obviously are already on a path to net zero, and the process that we are undertaking is the cost of net zero to the nation," she told ABC Radio on Friday.
"We are methodically working through the process, and in due course, we will come to our position on this."
Divisions have emerged in the coalition on net-zero emissions, with senior Nationals such as former deputy prime minister Barnaby Joyce calling for the policy to be abandoned.
But members in the Liberals have urged the policy stay following the coalition's election whitewash defeat.
Independent MP Allegra Spender said the lack of modelling by the coalition on emissions reductions signalled it was not looking at the issue seriously.
"What are the metrics they're considering, if they're not even considering modelling on different aspects? I really don't understand," she told ABC Radio.
The Business Council report said significant progress on building energy infrastructure was required for the nation to halve its emissions in the next decade.
The report provides government with clarity on the steps it must take to achieve its possible goals, according to the council's chief executive Bran Black.
"Ambitious but achievable targets with the right policies to deliver them are key to Australia's long-term competitiveness and prosperity," he said.
The report sets out multiple reforms and policy interventions required for targets ranging from a 50 to 70 per cent cut.
Mr Black labelled Australia's "long-beleaguered" approvals system a massive handbrake on a transition to renewable energy, including the Howard-era environment protection and biodiversity conservation rules.
"We urgently need that addressed to deliver more renewable energy projects," he said.
Climate Council chief executive Amanda McKenzie called for more members of the Business Council to support stronger 2035 emission targets.
"Economic modelling consistently shows that stronger climate action will drive more jobs and private investment in the Australian economy," she said.
