Two governments have put A$2.5bn into Australia's largest aluminium smelter, and the release the market got names the company's A$1.1bn and no public figure at all

Two documents describe the same deal, and only one of them carries a number for the taxpayer.

The joint media release from Prime Minister Anthony Albanese and New South Wales Premier Chris Minns states that the two governments have jointly contributed A$2.5bn to secure the future of aluminium smelting in the Hunter region. The state share is written as a ceiling rather than an amount: A$1.225bn over 10 years from 2029. No Commonwealth figure appears anywhere in the release. Should New South Wales pay that cap in full, what is left of the announced total is A$1.275bn, and that subtraction is this desk's rather than the government's, because a cap is not a commitment and the release does not publish the federal number in any form.

Rio Tinto's release, issued to the market the same morning, describes the same arrangement and names no public money at all.

It is precise about the company side. Tomago Aluminium will enter a 10 year power purchase agreement running to 2038, supplied entirely by renewable sources from 2033, beginning after the current electricity contract expires on 31 December 2028. The smelter will put A$1.1bn in real terms into the plant between now and 2038, of which A$100m is for decarbonisation. Rio Tinto holds 51.55 percent of the joint venture, Gove Aluminium Finance 36.05 percent and Norsk Hydro 12.4 percent.

What the money is meant to buy

Tomago produces up to 590,000 tonnes of aluminium a year, which Rio Tinto puts at almost 40 percent of Australia's annual production. It employs around 1,000 people directly, alongside 200 full-time equivalent contractors, and both documents put indirect employment at about 5,000. The plant sits roughly 13 kilometres west of Newcastle and its existing supply contract with AGL runs out in December 2028.

It is also the largest single electricity user in the country. The governments say the arrangement will underpin nearly 3 gigawatts of new renewable generation and firming capacity, and that it accelerates the decarbonisation of more than 10 percent of the New South Wales grid. Rio Tinto puts the emissions effect on the smelter itself at 7.1 million tonnes a year of Scope 1 and 2 operating carbon emissions, from 2033, once the renewable supply starts.

The taxpayer return has no mechanism attached to it

One sentence in the joint release says that the arrangements ensure revenue comes back to the federal government when aluminium prices are high, and that all Australians therefore stand to see a monetary return should prices rise.

There is no threshold in the document. No price, no share, no instrument, no term. Whatever the structure is, it is not in either release, and neither is the underlying agreement.

This is the second such deal in five months. Rio Tinto's release notes the March 2026 agreement with the Commonwealth and Queensland governments over the Boyne smelter at Gladstone, which leaves Australia's two largest smelters both operating on power arrangements underwritten by government beyond the expiry of their commercial contracts.