More detail on how Australia could use nuclear energy is set to be revealed in a speech by the opposition leader today on the power proposal.

Peter Dutton will give an address to the Committee for Economic Development of Australia laying out how the Coalition’s proposal to build seven nuclear reactors across five states would work.

However, it’s not expected the cost of building the reactors will be unveiled.

In June, the Coalition outlined the sites it planned to build reactors on should it win the next election. Should the proposal go ahead, the Coalition claimed it would be 10 to 12 years before the first reactor would be built, before the remainder would be constructed from the 2040s.

Dutton has previously said nuclear would become part of Australia’s overall energy mix, along with renewables. Nationals leader David Littleproud said the Coalition would reveal the costs of the nuclear policy before the election.

“[The speech] will outline our energy policy in totality, around what our mix will be, and that’s about not putting all our energy into one basket,” he told Sky News.

“We’ve taken a very mature approach to this, we’ve said that there’ll be seven locations across the country that will transition those coal-fired power stations to nuclear power plants.”

Treasurer Jim Chalmers said the Coalition proposal would not solve energy issues in Australia.

“Peter Dutton’s nuclear fantasy is economic insanity. It costs more, it will push power prices up, it will take longer,” he told Sky News on Sunday.

“He needs to come clean ... in this speech: what will it cost, what will it mean for power bills, how will he pay for it, and what will Australia do for the decades it will take to build these reactors.”