Consumers are being told they'll pay less at the checkout under a food security plan that would also protect Australian farmers.

Nationals leader David Littleproud committed to "fairness and transparency from the farm gate to your plate" by developing a comprehensive plan within six months if the Coalition wins government on May 3.

Litteproud spoke at the National Press Club in Canberra on Thursday, where steaks from Gippsland were served for the occasion.

He accused major supermarkets of "having a red-hot crack at you" by not passing on savings when wholesale food prices dropped.

"The evidence is vastly clear – in June, July last year, sheep and beef prices went down by 70 to 80 per cent at the farm gate," he said. "At the checkout, they went down by eight per cent."

Littleproud ruled out fixing prices but called for fairness.

The National Farmers Federation welcomed the commitment to a food security plan, saying it was a win-win for producers with Labor also supporting such a strategy – although the details differ.

Littleproud reaffirmed a Coalition government would go ahead with big-stick divestiture powers to break up large supermarkets as a last resort if they were found to engage in anti-competitive behaviour – something Labor has refused to support.

David Littleproud says supermarkets failed to pass on savings when wholesale food prices dropped. – AAP

He also used his major policy address at the pointy end of the election campaign to defend the Coalition's controversial nuclear energy policy and Opposition Leader Peter Dutton for not visiting any of the seven sites where a plant was proposed.

Anthony Albanese taunted Dutton on Wednesday while visiting a battery storage facility near where the Liberals have proposed a nuclear plant in Collie, Western Australia.

Dutton wasn't prepared to consult local communities because he was scared of the backlash, Albanese said.

Littleproud called the visit a "puerile stunt", criticising Albanese for not touring the coal plant that the nuclear site would supersede, instead heading to a renewables project "hidden from the reality".

"The prime minister didn't go anywhere near the coal-fired power station in Collie – sitting there and listening to those coal-fired power workers about their future, their kids' futures and grandkids' futures, of being able to stay and live there," he said.

"Let me make it clear, there's no need to go in an election campaign where you have already won the votes – we have already won the social licence in those seven communities. Our polling clearly shows that."