Why taxpayers are paying $2.5 billion to keep a Rio Tinto smelter open

By Margaret Hale · 2026-08-13

The price of keeping the lights on

There is a particular kind of political announcement that arrives dressed as generosity but is, on closer inspection, a confession. The joint federal and New South Wales commitment of A$2.5 billion to underwrite power costs at Tomago Aluminium is that kind of announcement. It tells you, if you read it carefully, that Australia's energy transition has so far failed the very industries it was supposed to carry.

The smelter north of Newcastle is not a fringe operation. It draws around 800 to 900 megawatts of firm supply, equating to roughly 12 per cent of New South Wales's total electricity demand, making it the state's single largest industrial power user.^[1] Its approved capacity sits at 600,000 tonnes of aluminium per annum.^[2] Shutting it would cost more than jobs. It'd cost the grid a major source of demand flexibility and the country a chunk of its industrial base.

None of that is in dispute. What is in dispute is why the public purse has become the only mechanism capable of keeping the place open.

The economics, plainly said

Electricity now accounts for more than 40 per cent of Tomago's operating costs.^[3] That figure is the load-bearing wall of this whole story. Aluminium smelting has always been energy-intensive, but for decades Australian smelters survived because they held long-term, fixed-price supply contracts with state-owned generators. Those contracts provided certainty. As Australia's grid transitioned toward renewables, the generation assets that backed those contracts were retired or restructured. The long-term contract market thinned out. Smelters were left to seek power at prices increasingly shaped by a grid in transition, a grid where firming capacity commands a premium and where contract prices, according to Australian Energy Regulator forecasts, are on track to roughly double by 2029.

The smelter didn't become unviable because it became inefficient. It became unviable because the policy environment changed around it, and the people who changed that environment are now writing the cheque.

Who owns Tomago, and what they reported last month

Tomago Aluminium is a joint venture. Rio Tinto holds 51.55 per cent, Gove Aluminium Finance Limited holds 36.05 per cent, and Hydro Aluminium holds the remaining 12.40 per cent. The smelter is independently managed, which is the kind of structural detail that matters when governments are asked why they're subsidising a facility majority-owned by one of the world's most profitable mining companies.

Rio Tinto reported profit after tax attributable to owners of US$6.7 billion in the first half of 2026.^[4] That result was announced on 29 July. The Tomago support package followed weeks later. One can hold two ideas at once: that a profitable parent company doesn't automatically mean a subsidiary is viable at current power prices, and that it strains credibility to present A$2.5 billion in public funds as an act of industrial necessity when the majority shareholder just posted a result of that magnitude.

The government hasn't tried to hide the tension. Prime Minister Anthony Albanese said the package is designed to ensure Tomago continues to forge Australia's prosperity and sustain skilled jobs in the Hunter region.^[5] Industry Minister Tim Ayres said the facility is vital to the Hunter, to Australia's aluminium value chain, and to national interest.^[5] These are defensible claims. They're also the claims governments make whenever they don't want to explain the mechanism.

Five rescues, roughly seven billion dollars

What ought to concentrate the mind is not the Tomago announcement in isolation but the pattern it completes. Since 2019, five energy-intensive processors have required public rescue: Nyrstar Hobart received around $135 million in 2019, Nyrstar Port Pirie around $105 million in 2020, Glencore's Mount Isa operations around $600 million in 2024, Whyalla's steelworks around $2.4 billion in early 2025, Boyne Aluminium around $2 billion in March 2026, and now Tomago at $2.5 billion. Cumulative public commitments across those five interventions amount to roughly A$7 billion.^[5]

That's not a series of one-off emergencies. That's a structural condition. And structural conditions require structural explanations, not a fresh press conference every eight months.

The implicit signal being sent to every remaining heavy industrial user in Australia is not subtle: hold out, and eventually the government will underwrite your power bill. That's not industrial policy. It's an auction in which the government is the only bidder and industry already knows the reserve price is zero.

The $275 that never arrived

Labor went to the 2022 election promising that its energy policies would cut household power bills by $275 per year by 2025. That commitment was not delivered. The Australian Energy Regulator's own forward projections suggest wholesale contract prices are tracking sharply upward through the remainder of this decade, not downward. The Grattan Institute's energy programme has been among the more persistent voices pointing out that the transition's costs are landing unevenly: on households, on energy-intensive industries, and now increasingly on the federal budget.

The government's rebuttal is that the package isn't a handout but a structured commercial arrangement: Tomago and its owners must commit at least A$1.1 billion in capital and decarbonisation investment and accept demand-response obligations in exchange for the fixed-price renewable power purchasing agreement running from 2029 to 2038. That's a real condition, not a fig leaf. But it doesn't answer the prior question, which is why the economics of a 600,000-tonne aluminium smelter, operating in a country with abundant renewable energy potential, require A$2.5 billion in public underwriting to stack up at all.

What the subsidy actually admits

The honest reading of this announcement is that Australia's grid transition has, to date, raised the cost of industrial-scale firm power to a level at which major users cannot secure long-term supply at prices compatible with global competition. The subsidy doesn't fix that problem. It defers it for one facility, for nine years, at public expense.

There are genuine arguments for the intervention. A thousand-plus jobs concentrated in a regional economy are not an abstraction. Sovereign aluminium capacity is not nothing in a world of supply-chain nationalism. Green aluminium, if the decarbonisation commitments are honoured, has real market value as trading partners tighten their own emissions standards. These arguments deserve weight.

But they also deserve honesty. The need for a subsidy of this size is itself evidence that the policy has not delivered. You can't simultaneously argue that Australia's energy transition is proceeding well and that its largest industrial electricity user needs the government to underwrite its power bill for the next decade. Those two propositions don't coexist comfortably. Choosing which one you believe tells you more about the state of Australian energy policy than any ministerial press release will.

The lights at Tomago will stay on until at least 2029 under this package. On the current trajectory of energy contract prices, the next request for public money is a matter of time, and the AER's own forecasts say so.

Margaret Hale

Margaret Hale writes about politics, policy and the culture of business. She is drawn to the people behind decisions and to the moments when a political story turns out to be a human one.