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Rio Tinto and Calix are developing the Zesty green iron demonstration plant in Australia to produce up to 30,000 t/y of hydrogen direct reduced iron or hot-briquetted iron using Pilbara iron-ore. The plant will operate as an open-access toll-processing facility, focusing on lower-emissions steelmaking through electric heating and hydrogen reduction.

Rio Tinto plans to invest over A$35 million and has secured a grant of up to A$44.9 million from the Australian Renewable Energy Agency. The project has entered the detailed design engineering phase, with a final investment decision expected in 2026.