Global mining and metals giant Rio Tinto has formalized a strategic five-year offtake agreement with SuperChar, an innovative renewable biomass charcoal producer, to integrate locally sourced bio pellets into its alumina refining operations in Gladstone, Australia. This partnership marks a significant milestone in Rio Tinto’s multi-decade strategy to decarbonize its heavy industrial processes, specifically targeting the replacement of coal in high-temperature steam generation. Under the terms of the agreement, deliveries of the renewable fuel are scheduled to begin in 2028, following the construction of a dedicated production facility by SuperChar in the Gladstone region.
The collaboration follows an intensive period of operational trials and a comprehensive feasibility study conducted by Rio Tinto to determine the viability of biomass as a direct substitute for fossil fuels. These trials, which tested various blends of bio pellets and coal, demonstrated that biomass could successfully replace up to 30% of the coal traditionally used in refinery boilers without compromising the stability or efficiency of the steam generation process. The success of these pilot programs has paved the way for a larger-scale implementation, signaling a shift in how one of the world’s most energy-intensive industries approaches process heat.
Strategic Decarbonization and Rio Tinto’s Net Zero Roadmap
Rio Tinto, a leading producer of iron ore, copper, and aluminum, is currently navigating a complex transition toward its stated goal of reducing operational Scope 1 and 2 emissions by 50% by 2030. To reach net zero by 2050, the company has identified process heat—the thermal energy required for chemical reactions and material processing—as one of its most significant hurdles. In alumina refining, the Bayer process requires massive quantities of high-pressure steam to dissolve bauxite into alumina. Historically, this steam has been generated by coal-fired boilers, contributing a substantial portion of the company’s carbon footprint.
The agreement with SuperChar is one component of a broader portfolio of energy transition initiatives. Rio Tinto is simultaneously exploring the electrification of refinery boilers, the use of hydrogen as a fuel source, and the large-scale deployment of wind and solar power to run its processing plants. However, bio pellets offer a "drop-in" or supplemental solution that can utilize existing boiler infrastructure with minimal modification, providing a faster route to emission reductions while more nascent technologies like green hydrogen reach commercial maturity.
The Role of SuperChar and Bana Grass Technology
SuperChar, an Australian firm specializing in plant-based green charcoal, has positioned itself as a sustainable alternative to traditional wood charcoal, which often relies on the harvesting of native forests. The company’s primary innovation lies in the use of Bana Grass (Pennisetum purpureum) as a feedstock. Bana Grass is a high-yielding, perennial energy crop known for its rapid growth and resilience. Unlike traditional timber, which can take decades to mature, Bana Grass can be harvested multiple times per year using equipment similar to that used in the sugar cane industry.
The environmental profile of Bana Grass is a key driver for the partnership. As a C4 photosynthetic plant, it is highly efficient at capturing atmospheric carbon dioxide. When converted into bio pellets, the carbon released during combustion is essentially the same carbon the plant absorbed during its growth cycle, creating a nearly closed-loop carbon system. Furthermore, SuperChar’s production process focuses on regenerative agriculture, ensuring that the feedstock is grown on land that does not compete with primary food production or contribute to deforestation.
The proposed production facility in Gladstone is expected to have an initial annual capacity of 35,000 tons of bio pellets. At full contract volumes, the use of these pellets is projected to reduce Rio Tinto’s reported Scope 1 emissions by approximately 90,000 tons of carbon dioxide equivalent (CO2e) per year. This reduction is equivalent to removing nearly 20,000 internal combustion engine passenger vehicles from the road annually.
Operational Implementation at Gladstone Refineries
The rollout of the bio pellet program will follow a phased approach, focusing on two of Rio Tinto’s major assets in Queensland: the Yarwun alumina refinery and the Queensland Alumina Limited (QAL) facility. Both sites are critical nodes in the global aluminum supply chain, producing the alumina that is eventually smelted into aluminum metal.
The operational demonstrations will begin with low-percentage blends—approximately 5% bio pellets to 95% coal—and gradually scale up to 50% as engineers monitor boiler performance, ash deposition, and thermal efficiency. The Yarwun refinery is slated to be the first to receive the shipments in 2028, given its existing technical readiness for fuel-blending trials. Following the successful integration at Yarwun, volumes will be increased at the QAL site, contingent upon regulatory approvals and the completion of necessary infrastructure upgrades to handle biomass storage and processing.
Armando Torres, Rio Tinto’s Managing Director for Aluminium Pacific Operations, emphasized that the transition away from fossil fuels requires a multifaceted approach. He noted that while bio pellets are not a singular "silver bullet," they represent a practical, scalable option that has been validated by rigorous technical data. The agreement allows Rio Tinto to secure a long-term supply of renewable fuel while SuperChar secures the offtake necessary to finance and build its Gladstone manufacturing hub.
Chronology of the Bio Pellet Initiative
The path to this five-year agreement has been defined by several years of technical validation and stakeholder engagement:
- 2023–2024: Initial laboratory-scale testing of various biomass feedstocks to determine energy density and combustion characteristics.
- 2025: On-site operational trials at Gladstone refineries. Engineers tested 10% to 30% biomass blends in industrial boilers to assess impact on steam output and equipment wear.
- Early 2026: Completion of a detailed feasibility study. The study confirmed that locally grown Bana Grass could provide a consistent, high-quality fuel source that meets the stringent requirements of alumina refining.
- July 2026: Signing of the five-year offtake agreement between Rio Tinto and SuperChar.
- 2026–2027: SuperChar commences site preparation and construction of the Gladstone bio pellet facility; Rio Tinto begins engineering work for fuel-handling systems at Yarwun.
- 2028: Target date for the first commercial deliveries of bio pellets and the start of the phased blending program.
Economic and Regional Implications for Queensland
The partnership is expected to provide a localized economic boost to the Gladstone region, which is increasingly being branded as a "clean energy hub" for Australia. By establishing a bio pellet plant in the area, SuperChar is creating a new agricultural supply chain. Local farmers may find new opportunities in cultivating Bana Grass, providing a diversified income stream that is less susceptible to the price volatility of food commodities.
Michael Palmer, Executive Chairman of SuperChar, highlighted that the agreement is a testament to the potential of "regeneratively grown biomass" to serve as a cornerstone for regional industrial decarbonization. The project aligns with the Queensland Government’s broader energy and jobs plan, which seeks to transition the state’s industrial heartlands toward low-carbon technologies while maintaining high-wage manufacturing jobs.
Industry analysts suggest that this deal may serve as a blueprint for other heavy emitters in Australia. As the Australian government tightens its "Safeguard Mechanism"—a policy that requires the country’s largest greenhouse gas emitters to reduce their emissions over time—companies are under increasing pressure to find viable alternatives to coal and gas.
Broader Impact on the Global Aluminum Industry
The shift toward bio pellets at Rio Tinto’s Gladstone operations is reflective of a global trend toward "Green Aluminum." Consumers in the automotive, packaging, and construction sectors are increasingly demanding materials with lower embodied carbon. By reducing the carbon intensity of the alumina refining stage, Rio Tinto can market its aluminum as a more sustainable choice for ESG-conscious buyers.
Furthermore, the success of this project could influence how other alumina producers in Brazil, Guinea, and China approach their own decarbonization challenges. While solar and wind are effective for providing electricity, the "hard-to-abate" sector of industrial process heat has long lacked affordable, large-scale solutions. The use of perennial energy crops like Bana Grass offers a potential pathway for refineries located in tropical and subtropical regions where such crops thrive.
As Rio Tinto moves toward the 2028 delivery date, the focus will shift to the logistical complexities of scaling biomass production. Ensuring a consistent supply of feedstock through varying weather patterns and maintaining the chemical consistency of the bio pellets will be paramount. However, with a five-year commitment in place, both Rio Tinto and SuperChar have the stability needed to refine these processes, potentially setting a new standard for the integration of renewable biomass in the mining and metals sector.
