Europe’s next debate over the Carbon Border Adjustment Mechanism (CBAM) could extend beyond steel and aluminium to the critical minerals underpinning its electrification and industrial strategies. Copper, nickel, lithium, cobalt, graphite and rare earths are essential for electricity grids, batteries, wind turbines, electronics and defence technologies, yet most remain outside the current carbon-border framework, even when their processing requires substantial energy.
Extending CBAM to selected critical minerals could help protect European refiners from carbon-related cost disadvantages. The move would also risk increasing costs for manufacturers that depend on imported materials, making the design and timing of any expansion crucial.
Why Critical Mineral Refining Could Enter CBAM
The main argument for extending CBAM is to create more consistent conditions between European producers and overseas competitors.
Refineries operating in the EU may face carbon costs under the EU Emissions Trading System (ETS) while investing in cleaner electricity and lower-emission production technologies. Competing imports produced under less stringent carbon constraints can gain a cost advantage if their embedded emissions are not reflected in the price paid at the European border. This is the type of carbon-leakage risk CBAM was designed to address.
A carefully targeted extension could also encourage foreign producers to improve their environmental performance. Importers able to demonstrate lower emissions could receive more favourable treatment than suppliers relying on carbon-intensive production, subject to the applicable rules.
For European copper, nickel and lithium processing projects, such an approach could strengthen the relationship between industrial decarbonisation and domestic supply-chain development.
Risks to Battery, Defence and Clean Technology Industries
Expanding CBAM would also create significant risks for European manufacturers.
Critical-mineral markets are often concentrated among a limited number of suppliers, while supply diversification and domestic processing capacity remain incomplete. An additional carbon-related import cost could therefore increase input prices for battery manufacturers, cable producers, defence suppliers and clean-technology companies before European alternatives become commercially available at sufficient scale.
Higher material costs could weaken the competitiveness of downstream manufacturers and complicate the expansion of European clean-technology production. A broader mechanism could also affect relations with resource-rich countries that the EU is seeking to engage through its critical raw-materials partnerships. Any expansion would therefore need to balance protection against carbon leakage with affordable material supplies, industrial competitiveness and international cooperation.
Different Production Routes Complicate Carbon Accounting
One of the biggest obstacles to extending CBAM is the difficulty of calculating emissions across different mineral-processing routes. Copper cathodes can originate from mined ore, recycled scrap or mixed feedstocks. Nickel production can involve laterite or sulphide ores, matte, ferronickel and refined metal. Lithium is produced from brines and hard-rock resources, while graphite can be natural or synthetic.
These production pathways have different energy requirements, processing stages and emissions profiles. A single default value may not accurately reflect the differences between facilities or technologies.
A workable system would require reliable installation-level emissions data, clear product boundaries and credible verification procedures. At the same time, reporting requirements would need to remain practical for producers and traders handling materials across complex international supply chains. Without consistent methodologies, the mechanism could create uncertainty and administrative costs without delivering a fair comparison between European and imported products.
Expanding CBAM Across Existing Sectors Shows the Challenge
Debates over downstream CBAM coverage demonstrate how difficult it can be to define the appropriate scope of the mechanism, even in established industrial sectors. The European Commission has proposed adding steel- and aluminium-intensive manufactured goods, while the Council and European Parliament have considered different approaches to the expansion.
These negotiations highlight the challenges of identifying covered products, tracing embedded emissions and determining how far carbon-border rules should extend along industrial value chains. Adding critical minerals would introduce further complexity because their production methods, market structures and supply-chain dependencies vary significantly.
A Selective Approach Could Be More Practical
Rather than extending CBAM to every strategic mineral, Europe could begin by assessing products with high processing emissions, clear comparisons with EU ETS-covered activities and demonstrable carbon-leakage risks. Such an approach would focus on whether carbon costs materially distort competition, rather than treating strategic importance alone as sufficient justification for inclusion.
Any proposed extension would also need to consider the availability of alternative suppliers, the readiness of European processing capacity and the potential impact on downstream manufacturers.
For investors and mining companies, the outcome could influence the economics of future refining projects, particularly in copper, nickel, lithium and other materials essential to Europe’s industrial transition. Critical-mineral refining could become CBAM’s next industrial frontier, but only if policymakers can demonstrate that additional coverage would address genuine carbon-leakage risks without undermining Europe’s access to essential raw materials.
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