Prime Minister Malcolm Turnbull said the finance proposal had merit, but he ruled out directly funding specific types of power generation.
"We are not in the business of subsidising one technology or another," he told reporters in Queensland on Thursday.
"We've done enough of that. Frankly, there's been too much of that."
Renewable subsidies, designed in the 1990s to make solar and wind technology more affordable, have worked and will end in 2020.
"We should simply allow the technologies to compete, and what we want to have is the outcome of lower prices," Mr Turnbull said.
Some coalition MPs claim the ACCC's recommendation to underwrite power generation is vindication for their push to build new coal-fired power plants.
But ACCC chair Rod Sims said no companies had proposed building new coal plants - instead they're trying to build new gas, pumped hydro or renewable projects.
Opposition Leader Bill Shorten said Mr Turnbull was offering solutions years away, having overseen a rise in power prices over the past year.
"You don't just go down to K-Mart and get a coal-fired power station off the shelf," Mr Shorten told reporters, admitting he had not read the ACCC report.
Energy Minister Josh Frydenberg said the recommendation to underwrite new power generators had a lot of merit, as it would address a market failure.
"What they're saying is the government needs to step in here to provide some sort of assurance," Mr Frydenberg told the Nine Network on Thursday.
He said that could include coal, gas, renewable energy or battery storage.
Deputy Nationals leader Bridget McKenzie said science should determine which technology would get the best outcomes for power bills.
Mr Turnbull said there was strong support for the vast majority of the ACCC's 56 recommendations, but the government would carefully consider the report, which sets out a blueprint to cut electricity bills by 25 per cent.
Acting Greens leader Adam Bandt said Australia should exit coal-fired power in favour of renewable energy to cut pollution.
The Australian Energy Council, which represents 21 major energy companies, said the government should consult on changes to avoid "unintended consequences".