More taxpayer money would be poured into coal and gas power plants under a plan to dump Australia's climate targets put forward by the federal opposition.

Liberal leader Sussan Ley has promised to scrap the government's commitment to net-zero carbon emissions by 2050 if her party wins the next election, claiming the move would lead to cheaper energy bills for households and businesses.

"The Liberal Party I lead will not stand by and let Australians get crushed by these high power prices," she told reporters in Canberra on Thursday.

"I can look Australians in the eye and say that prices will always be more affordable under us."

Ms Ley insisted her party would remain in the Paris climate accord, a landmark agreement that Australia signed when the coalition was last in power.

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