Rio Tinto Explores Large-Scale Thermal Battery for Alumina Refinery

Rio Tinto is embarking on an ambitious endeavor to integrate a significant thermal energy storage solution at its Yarwun alumina refinery in Australia. This project, a collaboration with California-based Rondo Energy, focuses on harnessing abundant midday solar power to heat refractory bricks. This stored thermal energy will then be converted into steam during off-peak hours, providing a sustainable alternative to traditional fossil fuels for the refinery's operational needs.
This pioneering initiative, currently in its engineering and design phase, is poised to become Australia's largest planned thermal energy storage project and a first for the alumina industry. The proposed system is projected to supply roughly 5% of Yarwun's steam requirements, leading to an estimated annual reduction of 67,000 metric tons of carbon dioxide emissions. The Rondo heat battery functions by charging during periods of inexpensive and plentiful electricity, then continuously delivering heat, ensuring uninterrupted factory operations. The proposed Yarwun system is designed with 360 megawatt-hours of thermal storage and can deliver up to 30 megawatts of heat, with an electrical charging capacity of 78 MW. The Australian Renewable Energy Agency (ARENA) is supporting this feasibility study with A$3.6 million, with further funding contingent on project progression, and Rio Tinto is matching the initial study contribution.
The study, expected to conclude in about 12 months, will evaluate the technical and economic viability of integrating this thermal energy storage system into the existing refinery infrastructure. By leveraging Australia's ample renewable energy resources, this project aims to transform industrial energy consumption, offering a blueprint for other sectors to adopt sustainable practices and significantly diminish their carbon footprint. This forward-thinking approach underscores a commitment to environmental stewardship and innovative industrial decarbonization.
This initiative represents a significant stride towards a more sustainable industrial future, demonstrating how innovative energy solutions can effectively reduce carbon emissions and enhance operational efficiency within energy-intensive sectors.