Steel processors in Southeast Europe face a potential gap in their EU carbon reporting when emissions information for purchased slab, billet and other relevant precursors cannot be linked to the installations that produced them. Even with reliable factory-level fuel consumption and production records, exporters may lack the upstream evidence needed to substantiate the embedded emissions of finished steel.
Under the Carbon Border Adjustment Mechanism (CBAM), emissions calculations for complex goods must account for relevant precursor contributions in accordance with the applicable production route and methodology. Emissions generated during a processor’s own operations do not necessarily represent the full embedded emissions applicable to its finished products. The challenge is particularly relevant when purchasing departments have detailed information on material specifications and prices but limited visibility into the production facilities and emissions history of their inputs.
Precursor data must follow the material through production
A hypothetical Serbian steel mill purchasing slab from Türkiye illustrates the issue. To calculate emissions for its exported products, the mill would need to connect its own production records with appropriate emissions information for the slab consumed. The example illustrates a potential documentation problem rather than a confirmed trade flow involving a specific company.
Where exporters use actual precursor emissions, the final installation’s verifier examines the relevant upstream verification information and the basis for linking it to the material consumed. A trader’s claim that slab has a low carbon footprint does not provide the same assurance as an eligible report from the producing installation. If sufficient evidence for actual emissions is unavailable, the applicable default treatment must be assessed under the relevant rules.
The documentation process should begin when precursor materials are purchased. Buyers need to establish whether suppliers can identify the producing installation and provide the necessary reporting information. Supply contracts can define deadlines for delivering emissions data and establish cooperation requirements. Delaying these requests until steel has been processed and sold to an EU customer can leave the exporter with less negotiating leverage.
Stock accounting and supplier traceability
Inventory management introduces additional complexity when materials remain in storage across reporting periods or similar precursors are sourced from multiple producers. The applicable methodology determines how reporting periods and averaging are handled. Exporters should not selectively assign the lowest available upstream emissions figure to EU-bound products unless the relevant rules and supporting records permit that treatment.
A practical control system should maintain a precursor register connected to receiving documentation, stock movements and production consumption. Quality certificates can support the identification of a material and its producer, but they are not substitutes for emissions verification reports. Commercial records, technical documentation and carbon data need to be linked within a consistent evidence system.
Geographic origin does not establish installation-level emissions
The same requirements apply to steel inputs sourced from China and other markets. Country of origin can affect the applicable default treatment and the process for obtaining emissions evidence, but geographic origin alone does not establish the actual emissions intensity of a particular producing installation. Where suitable verified production information is available, procurement decisions should take that evidence into account rather than rely on general assumptions about a country’s steel industry.
For EU buyers, supplier assessments consequently need to cover both the final processing mill and the upstream information chain. A producer may meet the required product specifications and delivery standards while remaining unable to provide sufficient documentation for actual emissions. Identifying that limitation before purchasing decisions are finalised allows buyers to distinguish product quality from the availability of usable CBAM evidence.
Procurement systems and long-term supplier relationships
Digital production records can improve traceability within a steelworks, but they cannot independently resolve missing information from upstream suppliers. Processors may need stronger contractual arrangements, closer supplier relationships and controlled inventory accounting to connect precursor emissions data with the material used in production.
The resulting compliance challenge can extend across several commercial transactions. A Southeast European mill’s ability to substantiate the emissions of steel exported to the EU may depend on records held by a precursor producer that has no direct contractual relationship with the European customer.
