The European Union’s Carbon Border Adjustment Mechanism is increasing the documentation requirements for renewable electricity producers seeking to use actual emissions data for electricity supplied to the EU. The European Commission published new guidance on CBAM verification and accreditation on 24 August 2026. Although aimed primarily at accredited verifiers and national accreditation bodies, the guidance has implications for wind, solar and hydro producers outside the EU, including those in Serbia, Montenegro and the wider south-east European market.
Verification Moves Into the Reporting Year
Verification is expected to begin during the reporting year rather than only after it ends. Monitoring methodologies, meters, contracts, IT systems, nomination records, transmission evidence and monthly control files must be capable of supporting the final annual verification.
The Commission also places particular importance on the Monitoring Plan. Under CBAM, the verifier must assess whether the plan complies with the applicable methodology, with the guidance recommending that this assessment be considered before other verification activities.
Renewable Power Requires Detailed Evidence
Renewable generation from wind, solar, hydro, geothermal or tidal sources does not by itself establish eligibility for actual emissions treatment. Electricity must be covered by a power purchase agreement between the authorised CBAM declarant and the non-EU producer. The generating installation must be directly connected to the Union transmission system or supported by evidence that physical congestion did not prevent delivery.
The installation must remain below the 550 grams of fossil CO₂ per kilowatt-hour threshold. Electricity must also be firmly nominated against allocated interconnection capacity by the relevant TSOs in the origin, destination and, where applicable, transit countries. Production and nomination must cover the same period of no more than one hour, while an accredited verifier must receive at least monthly interim reports confirming that the conditions remain fulfilled.
PPAs and Hourly Data Become Verification Evidence
The PPA itself forms part of the verification trail. Verifiers must assess the relevant parties, authorised declarant, producer’s CBAM Installation ID, reporting period, quantities and supporting records such as invoices and delivery information. The one-hour matching requirement makes granular electricity data essential. Smart-meter records must demonstrate production and delivery within matching periods, while TSO nomination data must be reconciled with generation and import data.
Physical congestion must also be documented. Where electricity is not directly connected to the Union transmission system, evidence may need to demonstrate that Net Transfer Capacity at critical nodes was not exceeded. Timestamped congestion reports may be used, while TSOs in transit countries may also need to provide evidence.
Monthly and Declarant-Level Controls
Monthly reporting requires producers to maintain consistent evidence and reconcile SCADA data with settlement meters, generation with nominated volumes, and PPA quantities with claimed CBAM quantities. CBAM also introduces declarant-specific addenda containing the authorised declarant, its EORI number and the electricity quantity imported from the relevant installation. Each addendum must be separately assessed where actual emissions are used. Producers supplying several EU buyers therefore need records structured around installation × hour × declarant, rather than only plant-level annual production.
Implications for South-East European Electricity
The requirements are particularly relevant to the western Balkans and neighbouring south-east European markets, whose electricity systems are interconnected with the EU through Hungary, Romania, Bulgaria, Croatia, Slovenia, Greece and Italy.
For producers in Serbia and Montenegro, CBAM documentation can therefore become directly linked to cross-border electricity transactions, including nomination records, interconnection capacity and evidence of physical delivery. The Commission notes that proposed amendments affecting electricity rules were still under legislative discussion when the guidance was prepared and were therefore not incorporated. The current framework places increasing importance on proving the origin, timing, physical delivery and contractual allocation of renewable electricity through evidence that an independent verifier can test.
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