The European Commission’s latest Q&A addresses how embedded emissions should be handled when a complex good relies on the same precursor from multiple installations. It states that the standard method is to use a weighted-average embedded-emissions value. Producers may use data from a single installation or a subset only if they can provide sufficient evidence that the corresponding precursors were used in the relevant production process.
Weighted-average embedded emissions for shared precursors
The Commission’s clarification applies to situations where one precursor is sourced across different installations. In those cases, the approach described in the Q&A is intended to reflect the range of precursor origins through averaging. The alternative—using narrower installation data—depends on evidence linking the precursor to the relevant production process.
For aluminium processors, the guidance increases the importance of inventory traceability. Primary aluminium, recycled billet and low-carbon aluminium produced using hydroelectric power may be interchangeable in some applications, but they can have significantly different emissions profiles. If these inputs are pooled without a defensible record of origin and use, any emissions advantage from cleaner inputs may be diluted in CBAM calculations.
Downstream CBAM proposal would extend data across production stages
The traceability issue is gaining relevance alongside the European Commission’s downstream proposal, file 2025/0419(COD). The proposal aims to bring selected aluminium-intensive finished goods within the Carbon Border Adjustment Mechanism from 2028. The European Parliament adopted its position in September and broadened parts of the proposed scope.
The final product list remains subject to negotiations with the Council of the European Union. The expansion is still a legislative proposal and is not current law. If adopted, fabricators could be required to preserve precursor emissions information across multiple stages of production.
Under that scenario, CBAM-related data management would extend beyond smelters into downstream activities including extrusion, rolling, machining and assembly. This would affect how precursor information is recorded and carried through supply chains that transform aluminium into finished goods.
Operational preparations for Southeast European aluminium suppliers
Manufacturers in Southeast Europe supplying EU automotive, construction and industrial customers may begin preparations before any changes take effect. Enterprise resource planning (ERP) and warehouse systems would need to link incoming aluminium to specific production batches where supplier-specific emissions data has commercial value. This requirement would apply in cases where upstream information can be tied to particular lots used during processing.
EU customers may also introduce carbon-data clauses into long-term supply contracts ahead of the proposed start date. Such clauses could be relevant where suppliers compete on recycled content or on primary aluminium produced using renewable electricity. Contract terms could therefore increase demand for documentation of emissions characteristics associated with metal inputs.
Demonstrating precursor origin for low-emission claims
The commercial value of low-emission aluminium would depend on both the metal’s emissions intensity and whether its origin and use can be demonstrated through relevant production stages. This links documentation requirements to how inputs are tracked from upstream sourcing through subsequent processing steps.
As downstream CBAM negotiations progress, preserving reliable precursor data could become a differentiator for aluminium fabricators supplying the EU market. The ability to maintain records that support claims about upstream origins would therefore be tied to compliance expectations under any expanded scope.