$250 Million a Year to Keep the Tomago Smelter Running

The Tomago smelter north of Newcastle will keep making aluminium until at least 2038, after the federal and New South Wales governments agreed to spend $2.5 billion over a decade underwriting its electricity. The support starts in 2028 and runs at $250 million a year. It goes to a plant majority-owned by Rio Tinto, one of the most profitable mining companies on the planet, which is precisely why the announcement landed with a thud in some quarters.

The Hunter plant is not a marginal operation. It produces up to 590,000 tonnes of aluminium a year, employs more than 1,000 full-time staff plus roughly 200 contractors, and draws about 12 per cent of all the electricity consumed in NSW. That makes it the single largest power user in the country. Electricity accounts for around 40 per cent of what it costs to run.

That last figure explains the whole deal. Tomago's current supply contract expires in 2028, and no generator was going to replace it at a price that let the smelter compete with producers in the Gulf and China. So rather than write a cheque, the two governments are covering the gap between market power prices and a negotiated long-term rate — a structure that behaves far more like a hedge than a rescue.

What the Tomago smelter deal actually buys

The support runs through Snowy Hydro via what the Commonwealth describes as a specialist investment vehicle. It underpins a long-term power purchase agreement at a fixed, competitive price, with taxpayers wearing the difference when wholesale prices sit above that line. Concessional finance is also attached to build the generation and storage that will eventually feed the plant, according to reporting by Reuters.

The owners are not getting this for free. Tomago's joint venture has committed $1.1 billion of its own capital and major maintenance spending over the next ten years, Rio Tinto says, with about $100 million of that going to decarbonisation. The smelter shifts to fully renewable supply from 2033, which the company estimates will cut roughly 7.1 million tonnes of emissions a year.

Why the power bill decides everything here

Aluminium is basically stored electricity

Smelting works by running an enormous current through dissolved alumina, non-stop, forever. The pots cannot be switched off and restarted casually — let them cool and the metal freezes solid, wrecking the cells. That physical reality is why a 40 per cent power cost share is normal for the industry, and why an electricity contract, not commodity prices, is usually what kills a smelter.

The 2028 cliff that forced the talks

With coal generators retiring across the National Electricity Market and firmed renewables still being built, nobody could offer Tomago a decade of cheap, reliable supply on commercial terms alone. Negotiations ran for more than a year. The alternative was a closure decision arriving with very little warning, in a region where the plant is a cornerstone employer.

Why the grid gets something back

A load that size is also a tool. Tomago can reduce draw at short notice when the system is stressed, which is worth real money to grid operators on hot summer afternoons. Governments are counting part of that value, along with aluminium revenues, in their argument that the package can approach cost neutrality over its life.

Who actually owns the plant getting the help

Rio Tinto holds 51.55 per cent of the joint venture, Gove Aluminium Finance owns 36.05 per cent, and Norway's Norsk Hydro has the remaining 12.4 per cent. That ownership is the crux of the objection: governments spent years resisting direct subsidies to firms of this size and profitability, and this deal crosses that line.

If Australia doesn't produce aluminium, then the knock-on effect in other industries is significant.

Prime Minister Anthony Albanese made that case publicly, per Reuters. Industry Minister Tim Ayres framed the choice more bluntly, warning of smelter-sized holes appearing in regional industry if nothing was done. Rio Tinto chief executive Simon Trott welcomed the outcome as the product of years of work with the venture's partners.

How this sits alongside Whyalla and Nyrstar

This is the third large industrial support package in short order, after the Whyalla steelworks and the Nyrstar smelting operations. The pattern critics point to is uncomfortable: every recipient is an energy-hungry manufacturer, which invites the question of whether energy policy is creating the problem the subsidies then solve. The counter is that Tomago's package is structured, time-limited and tied to private co-investment, where earlier interventions were emergency triage.

What $250 million a year works out to

Spread across the roughly 1,200 direct staff and contractors on site, the annual support is about $208,000 per role — a number that sounds indefensible until you weigh it against the $2.2 billion the operation contributes to the economy each year and the $3 billion it exports. On a per-person basis, $2.5 billion over a decade is close to $90 for every Australian, or about $9 a year.

Both framings are true. Which one you find persuasive depends on whether you think a domestic aluminium industry is worth insuring against the alternative of importing the metal and losing the downstream fabricators that depend on it.

What to watch between now and 2028

Two things are still missing. The split between Canberra and Macquarie Street has not been detailed, and the power purchase agreement itself is not finalised — the price, the term and the clawback terms will determine whether taxpayers ever see money back. Watch for those documents, and watch whether the renewable generation and storage promised for 2033 is actually contracted and under construction well before then. If it isn't, the same conversation returns with a bigger number attached.