News & Market Analysis: How Carbon Costs Have Evolved To Reshape Aluminium Pricing

The Carbon Border Adjustment Mechanism does not simply impose an additional cost on high carbon metal, it reshapes the relative economics of every tonne competing inside the European market, and the aluminium trade is already adjusting to that shift in three overlapping ways.

The first impact is the effective discounting and lower desirability of higher carbon aluminium at the point of physical delivery. Buyers facing a calculable CBAM liability will not pay the same delivered price for coal powered Chinese metal or gas-based Gulf production as they would for hydropower based Norwegian tonnes. Reuters calculations using draft CBAM default values (rather than plant specific verified emissions data) estimated a potential charge of around €168 per tonne for aluminium imports from Mozambique under an EU carbon price of €80 per tonne of CO₂. Imports from India and the UAE were estimated at around €51 per tonne. Mozambique was the EU’s largest aluminium supplier through much of 2025, which underlined the scale of the exposure, though Mozal, the country’s largest smelter, was idled in March 2026 due to high power costs. 

The European Commission then published the first official CBAM certificate price on 7 April 2026 at €75.36 per tonne of CO₂, creating the world’s first operational carbon border price. The spread between higher and lower carbon aluminium entering Europe is no longer theoretical. It is legally enforceable, calculable per tonne, and set to widen further as free ETS allowances are phased out through 2034.

The second dynamic is the emergence of a green premium. Low carbon producers in Norway, Iceland and Canada have long struggled to fully monetise their emissions advantage in a market where all primary aluminium was benchmarked against the same LME price. CBAM begins to change that calculus, although with an important limitation. The European Commission has confirmed that indirect emissions from electricity consumption remain outside the scope of CBAM for aluminium for the foreseeable future. In aluminium production, these indirect emissions (Scope 2) typically account for 60–80 percent of total carbon intensity, depending on the power source.

That matters because this electricity accounts for the majority of aluminium’s total carbon footprint and represents the central competitive distinction between hydropower based smelters and coal powered grids. In practical terms, CBAM currently prices direct emissions only, which limits but does not eliminate the carbon adjusted spread between producers.

Even within that narrower framework, the cost gap is meaningful. Norsk Hydro produces aluminium in Norway with a carbon footprint substantially below the global average, and that lower emissions intensity already carries real delivered cost value for European buyers. The market implication is straightforward. If compliant low carbon supply is structurally scarce relative to European demand, the emissions advantage becomes monetisable. How much of that value accrues to producers versus consumers will depend on the balance of supply and demand for verified low carbon tonnes, which remain concentrated in a relatively small number of hydropower linked smelters. The exclusion of indirect emissions is widely recognised as a design limitation rather than a permanent settlement. The direction of policy travel remains toward broader carbon coverage, and both producers and buyers negotiating long term supply agreements are already pricing in that trajectory.

The third dynamic is negotiated cost sharing across the supply chain. Where European buyers maintain established relationships with higher carbon producers, the CBAM liability will not necessarily be passed through in full. Industry guidance increasingly recommends flexible pricing mechanisms and scenario modelling to manage variable carbon costs and potentially significant changes in landed pricing. Contractual cost sharing does not remove the liability, rather, it redistributes it across the chain.

Crucially, it does not change the underlying price signal: higher‑carbon metal remains structurally disadvantaged. The commercial incentive to favour lower carbon supply nevertheless remains intact regardless of how the cost burden is allocated.

At present, most of this repricing is occurring through physical premia and bilateral commercial contracts rather than through the exchange benchmark itself. The result is growing regional segmentation within the aluminium market. Lower carbon tonnes are increasingly drawn toward Europe, while more carbon intensive supply seeks demand in less regulated markets. One open question is whether CBAM ultimately leads to a dual-price system for aluminium, with a transparent carbon-based sustainability premium added to an LME base price plus regional premiums as producers seek ways to capitalise on competitive scope 1 emissions or whether bespoke carbon costs remain embedded in regional physical premia.

The LME is not a passive observer of this transition. The exchange has already begun formalising a sustainability premium. It has introduced an 8tCO₂e/t aluminium threshold for its sustainable metals framework (covering Scope 1, 2 and 3 emissions), while developing sustainability related pricing mechanisms underpinned by International Aluminium Institute methodology and third party Aluminium Stewardship Initiative assurance. LME Chief Executive Matthew Chamberlain has stated that market participants support “establishing a way to reflect an LME brand’s sustainability in its price.”

The question is therefore not whether a carbon adjusted aluminium market is emerging. It already is. The real question is whether CBAM costs will become embedded in existing aluminium premia, or if it will drive the emergence of a new, distinct layer, within an already fragmented pricing structure through sustainability premiums.  

Sources

1. European Commission, Carbon Border Adjustment Mechanism framework and CBAM certificate pricing disclosures.
2. Reuters reporting and industry modelling on projected CBAM aluminium liabilities under draft default values.
3. European Commission technical guidance on treatment of indirect emissions under CBAM.
4. Norsk Hydro sustainability and carbon intensity disclosures.
5. London Metal Exchange sustainability initiatives and public statements by Matthew Chamberlain.