Mining giant Rio Tinto has committed to buying all the electricity from a 1.1 gigawatt solar project in Queensland — the largest solar farm ever contracted on Australia’s main grid. The deal marks a significant step in the effort to run one of the country’s most energy-intensive industries on clean power.
At a glance
- Gigawatt-scale solar: The Upper Calliope solar farm will have a peak capacity of 1.3 GWp and an AC output of 1.1 GW, making it the first project of this scale on Australia’s National Electricity Market.
- Power purchase agreement: Rio Tinto has signed a contract to buy 100% of the farm’s electricity output, directing clean energy to its smelting and refinery operations near Gladstone in central Queensland.
- European Energy partnership: The farm will be built and operated by European Energy, a Denmark-based developer entering the Australian market for the first time, with construction expected to begin in 2025 C.E. or 2026 C.E.
Why Gladstone matters
Gladstone is one of Australia’s most industrially dense coastal cities. It is home to one of the world’s largest alumina refineries, an aluminum smelter, and a boron plant — all operated by Rio Tinto and all extremely power-hungry.
These facilities have long depended on coal-fired electricity, and their future has been uncertain as Australia’s grid transitions away from fossil fuels. High energy costs and the difficulty of securing reliable clean power have threatened the long-term viability of heavy industry in the region.
The Upper Calliope deal is a direct attempt to change that. Located about 50 kilometers southwest of Gladstone, the solar farm would supply the kind of large, stable power block that industrial operations require. Rio Tinto CEO Jakob Stausholm called it “a first important step in our work to repower our Gladstone operations” and said the company remains committed to “keeping sustainably powered industry in Central Queensland.”
A new scale for Australian solar
Australia has built solar capacity quickly over the past decade, but projects of this size on the main grid have remained out of reach — until now. A 1.1 GW AC solar farm is roughly equivalent to a large coal power station in output terms, though it generates power only when the sun shines.
That distinction matters. Stausholm acknowledged that “competitive capacity, firming, and transmission” are still critical challenges. Firming — the process of storing or backing up solar power so it flows reliably day and night — remains one of the harder problems in the energy transition, particularly for industrial customers who cannot tolerate gaps in supply.
The Upper Calliope project still needs development approval and grid connection clearance before construction can begin. Those processes can be slow and contentious in Queensland, where transmission infrastructure has not always kept pace with renewable energy ambitions.
Industry as a driver of the transition
One of the more underappreciated dynamics in the global clean energy shift is the role of heavy industry. Steel, aluminum, and chemicals require enormous amounts of electricity and heat, and they have historically been among the last sectors to decarbonize.
When companies like Rio Tinto sign long-term agreements of this scale, they send a powerful market signal. A committed buyer makes financing easier for developers, which in turn makes it more viable to build the transmission and storage infrastructure the whole grid needs.
European Energy, the Danish developer behind the project, is a relative newcomer to Australia but has built a strong track record in Europe. Its entry into the Australian market — at gigawatt scale, no less — suggests international confidence in the country’s renewable energy potential.
Rio Tinto is also working with the Queensland and Australian federal governments on the broader question of how to secure firmed, affordable power for its Gladstone plants over the long term. The solar deal alone does not solve everything, but it gives those conversations something concrete to build around.
Read more
For more on this story, see: RenewEconomy
For more from Good News for Humankind, see:
- Renewables now make up at least 49% of global power capacity
- Marie-Louise Eta becomes the first female head coach in men’s top-flight European football
- The Good News for Humankind archive on Australia
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