Opposition Leader Peter Dutton says a Coalition government will build more gas-fired power stations to firm up renewable energy, in addition to his proposed seven nuclear power stations, the details of which will be unveiled next week.

Speaking amid a campaign-style blitz on Labor seats this week, Mr Dutton confirmed the Coalition’s modelling will say nuclear power is cheaper over the long run than Labor’s plans to achieve 82 per cent renewable energy in the grid by 2030.