The new chief executive of Tomago Aluminium, the country’s biggest electricity user, says the venture’s goal of switching to a predominantly clean power supply later this decade is not achievable, derailing its emissions reduction targets for 2030 and putting the plant’s future at risk.

Jerome Dozol, who took over as chief executive in July, said the energy price on offer was too high for the Tomago smelter near Newcastle to keep running without government assistance. He called for “urgent action” to secure continued operations at the plant, whose existing electricity supply contract with AGL Energy expires at the end of 2028.