Gas supply will be key to the coalition's energy policy after the federal opposition walked away from a net-zero emissions target.

Speaking after senior Liberals and Nationals met to endorse the plans, Opposition Leader Sussan Ley said the coalition sought to reduce carbon emissions, but not at the expense of family or business budgets.

"Our plan secures Australia's energy future by putting affordability first," she told reporters in Sydney on Sunday.

"The plan that I released today is all about affordable energy and responsible emissions reduction."

Under the coalition, interim emissions reduction targets are also opposed along with various Labor policies to bring down emissions.

These include a safeguard mechanism capping big polluters' emissions and a scheme designed to encourage u

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