The European Commission published new guidance on CBAM verification and accreditation on 24 August 2026. The document is aimed at accredited verifiers and national accreditation bodies, but it also affects electricity producers outside the EU. It focuses on how cross-border renewable electricity can qualify for preferential treatment under the Carbon Border Adjustment Mechanism. The guidance is relevant for wind, solar and hydro generators in Serbia, Montenegro and the wider south-east European market.
The Commission’s approach distinguishes between producing renewable electricity and proving that specific volumes qualify for CBAM treatment. It encourages verification work to begin during the reporting year rather than waiting until after the year ends. Strategic analysis, risk analysis and site visits may occur before the reporting period is complete. The final opinion is issued only after the full year’s data are available.
Verification planning starts during the reporting year
The guidance recommends that operators engage accredited verifiers early in the reporting year. This is intended to avoid bottlenecks and to identify issues before they become difficult to correct. The Commission cites examples including missing meter records that may be reconstructed earlier in the year. It also points to network nomination or congestion records that may not be recoverable if discovered much later.
Verification begins with a pre-contract stage in which the verifier assesses competence, independence, personnel and time for the assignment. Operators are expected to provide the latest Monitoring Plan, installation documentation and relevant previous reports. For electricity-specific cases, operators must also provide information including power purchase agreements, direct technical links and smart metering evidence. The goal is to establish both physical and contractual chains.
The Monitoring Plan has a central role in CBAM verification under the guidance. Under the EU Emissions Trading System, an approved monitoring plan is assessed by a competent authority and verifiers check whether operators followed it. For CBAM, the Commission states that verifiers themselves must assess whether the Monitoring Plan complies with the applicable CBAM methodology. The Commission describes this assessment as conceptually similar to validation because it is forward-looking.
Monitoring plan assessment becomes a front-loaded task
The guidance explicitly recommends considering whether Monitoring Plan assessment should be front-loaded before other verification activities. This timing matters because defects in metering hierarchy, data-flow mapping or contract architecture may only become apparent when end-of-year data are compiled. In that case, an entire period of electricity may not be supportable using actual emissions data. The emerging model therefore links operational readiness to assurance outcomes across the reporting year.
The guidance describes an operating model with three layers. The producer builds and operates monitoring and evidence infrastructure. An independent readiness or pre-verification adviser may help design procedures, map data and remedy weaknesses. An accredited verifier then independently assesses the system and issues the formal assurance opinion.
The separation between advisory support and formal verification is tied to independence requirements. The Commission states that verifiers must preserve independence and avoid unacceptable self-review risk by supporting development of either the Monitoring Plan or emissions report they later verify. This creates an advisory market outside accredited verification services.
Zero-emission generation still requires additional CBAM conditions
For wind and solar producers, CBAM can appear straightforward because generation is treated as effectively zero-emission at production for certain verification purposes. The Commission identifies wind, solar, hydro, geothermal and tidal generation as examples of zero-emissions power plants for specific verification uses. However, for electricity imported into the EU as a CBAM good, eligibility depends on more than whether generation is renewable.
If actual embedded emissions are used instead of default electricity values, transactions must meet multiple conditions set out in the guidance. Electricity must be covered by a power purchase agreement between an authorised CBAM declarant and a non-EU electricity producer. The generating installation must either be directly connected to the Union transmission system or have evidence showing no physical network congestion prevented delivery at the relevant time.
The generating installation must remain below 550 grams of fossil CO2 per kilowatt-hour. Electricity must be firmly nominated against allocated interconnection capacity by responsible transmission system operators in countries of origin, destination and transit where relevant. Production and nomination must refer to the same period, which cannot exceed one hour. Accredited verifiers must receive at least monthly interim reports showing continued fulfilment of these conditions.
PPA terms must support an auditable chain
The guidance indicates that for a Serbian or Montenegrin wind farm, meeting an emissions threshold may not be the main challenge. Instead, demonstrating that claimed electricity volumes remain contractually, physically and temporally linked from generation to an EU declarant is described as more difficult. It notes that carbon content may be zero while evidence requirements still apply.
A key implication is that the power purchase agreement becomes part of verification evidence rather than only a commercial umbrella for green electricity sales. For CBAM purposes, verifiers are expected to check whether agreements are signed by relevant parties and whether authorised declarants are correctly identified. They also assess whether a producer’s unique CBAM Installation ID is linked to transactions.
Verifiers are instructed to examine whether agreements cover the reporting period and quantity claimed. They also assess whether contracted electricity can be reconciled with supporting information such as invoices or delivery records. Verifiers check whether contracted volumes are clearly identified and whether double counting is prevented, including when intermediaries are involved through contractual structures required by methodology.
Hourly matching requires smart-meter data and reconciliation
The one-hour requirement is presented as a clear indicator of where market practice is moving under CBAM verification rules. Smart-meter data must show that electricity was produced and delivered within matching periods of no more than one hour when actual values are used in relevant electricity arrangements. Verifiers are expected to compare generation with consumption or delivery data to assess whether claimed electricity came from stated sources during appropriate periods.
For electricity imported into the EU, additional reconciliation applies beyond smart-meter comparisons. Transmission system operator nomination data must be reconciled with generation data, with confirmation required that accepted network nomination time matches production and import time being claimed. This creates a need for something resembling a CBAM electricity ledger based on hourly traceability rather than annual totals.
The guidance indicates that each relevant hourly record may need to connect date and hour with generating installation details including meter information and generated quantity. Records should also link PPA information, authorised declarant identity, EORI number, origin transmission system operator details, transit transmission system operators where relevant and destination transmission system operator details. Additional fields include nominated quantity, accepted nomination quantities, congestion evidence, eligible CBAM quantity and references to supporting evidence packs.
Physical congestion evidence becomes part of eligibility
The guidance includes requirements related to physical network congestion when electricity is not directly connected to the Union transmission system. Where actual-emissions treatment depends on eligibility conditions, evidence must demonstrate that no physical network congestion occurred along relevant routes at export time. The Commission states verifiers should examine whether Net Transfer Capacity at critical nodes was not exceeded due to imports under consideration.
If documentation is unclear, verifiers may need to contact relevant transmission system operators directly. The guidance suggests timestamped congestion reports may be used to demonstrate absence of congestion where needed for eligibility assessment. Similar evidence may be required from transmission system operators in transit countries.
The Commission frames this as significant for south-east Europe due to interconnected systems across multiple borders before reaching EU internal markets. It notes congestion frequency alongside structured capacity allocation and that market coupling does not necessarily make evidentiary chains easier to document across borders.
Monthly interim reports support continuous assurance
The requirement for monthly interim reports reinforces continuous assurance under CBAM verification expectations. Accredited verifiers must receive at least monthly information showing fulfilment of relevant conditions throughout reporting periods. The guidance says verifiers should check that expected monthly reports have been provided and align with underlying evidence.
Where there has been no change since prior reporting cycles, monthly reports may document status rather than reproduce static information repeatedly. Operationally this encourages monthly close processes aligned more closely with finance controls than traditional environmental reporting practices described in the guidance.
A well-run producer would reconcile SCADA data with settlement meters, compare generation against nominated volumes and reconcile PPA quantities with claimed CBAM quantities. It would also check declarant allocations, investigate exceptions, document corrections and lock controlled monthly evidence packages suitable for assurance testing.
Declarant-specific addenda require multi-dimensional data
The guidance introduces declarant-level granularity between power producers and EU importers when actual emissions are used for imported electricity under CBAM rules. Operators’ emissions reports must include declarant-specific addenda identifying authorised CBAM declarants along with their EORI number. These addenda must also state quantities imported from relevant installations where criteria are satisfied.
Verifiers then assess each addendum separately and issue separate confirmations where sufficient evidence exists for each one described in the guidance. This means plant-level databases alone are insufficient when multiple EU buyers or declarants are involved under different allocations within transactions.
The minimum practical data structure described becomes three-dimensional: installation multiplied by hour multiplied by declarant identity. The commercial impact noted in the guidance links value outcomes to completeness of supporting CBAM evidence available for EU importers using actual data rather than default values.
Evidence infrastructure supports transaction-level confirmation
The Commission’s guidance describes how verification-ready power depends on an evidence infrastructure rather than solely physical generation assets. It outlines a logical architecture involving a central repository connecting installation identity, plant boundaries, meter hierarchy, SCADA and EMS records alongside contracts, traders, nominations and transmission system operator confirmations. Monthly reports include declarant identities plus corrective actions leading into final verification outputs described in the document.
The repository concept supports movement through an evidence chain both directions: from annual report back toward individual hours and from individual meter readings forward toward declarant-specific CBAM quantities required for assurance testing described by the Commission’s approach. Verification testing involves detailed testing procedures including reconciliation tracing back to primary data as well as reassessment of whether monitoring methodology was correctly applied.
Regional trading strategy faces early compliance constraints
The implications are described as especially important for western Balkans markets within south-east Europe due to interconnected systems with EU member states through Hungary, Romania, Bulgaria, Croatia, Slovenia, Greece and Italy. The region has a growing pipeline of wind projects alongside solar projects and storage projects referenced in the guidance context.
For producers in Serbia and Montenegro, CBAM interacts directly with power trading strategy according to the guidance’s discussion of how delivery eligibility depends on documentation completeness across cross-border arrangements. Market participants may seek where specific volumes can be delivered using combinations of commercial price signals alongside available interconnection capacity while meeting sufficiently robust CBAM evidence requirements described in terms such as congestion evidence availability nomination records access or declarant documentation quality.
The guidance notes that proposed amendments affecting electricity rules were under legislative discussion when it was prepared and therefore were not incorporated into it at publication time on 24 August 2026. It states that details may evolve while indicating direction of travel already established through its described framework for proof elements including origin timing deliverability within network paths nominations accepted capacities congestion documentation allocation among authorised declarants supported by verifier-testable evidence inputs.
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