Interconnector capacity is becoming a compliance consideration for electricity traders seeking to apply actual-emissions treatment under the EU Carbon Border Adjustment Mechanism (CBAM). In addition to enabling commercial transactions between electricity markets, transmission rights and associated scheduling records can help establish whether imported volumes correspond to generation from a specifically identified eligible installation.
The distinction matters because owning cross-border capacity does not, by itself, establish eligibility for actual-emissions treatment. Traders must maintain an auditable link between the electricity produced, the capacity allocated and the volumes nominated for import into the EU.
Annex IV Sets Cumulative Requirements for Cross-Border Deliveries
Under Annex IV(5), the relevant requirements include a connection to the EU transmission system or evidence that physical network congestion did not occur along the relevant route at the time of export. Firm nominations must also be made against allocated interconnection capacity by the responsible transmission system operators (TSOs)3 in the country of origin, destination and any transit countries.
These nominations must correspond to the installation’s generation over intervals of no longer than one hour. The requirements apply cumulatively, meaning that the purchase of a cross-border capacity right cannot substitute for the other evidence required to support an actual-emissions claim.
Preparing the necessary records begins before electricity is delivered. Depending on the border and applicable market rules, transmission capacity may be obtained through daily, monthly or longer-term auctions. Traders need to identify the capacity holder, delivery period, relevant nominations, accepted amendments and final schedules.
The independent power producer’s (IPP) generation records should be linked to the accepted schedules through consistent timestamps and quantity units. Where capacity rights are resold or transferred, the documentation must reflect the actual transaction and comply with the applicable capacity-allocation rules.
Serbia–Hungary Trading Requires Coordinated Scheduling Records
The Serbia–Hungary border illustrates the number of parties that may contribute to the evidence chain. A Serbian electricity producer, a local balancing party, an EMS-related scheduling process, an EU import trader and the interface with MAVIR may all be involved, even though they operate as separate entities.
Contracts need to establish responsibility for collecting confirmations from each relevant system and specify how rejected, amended or otherwise changed nominations will be managed. A generation forecast provided to a trader does not constitute the same evidence as a final nomination accepted by the relevant TSO.
The allocation of these responsibilities is important because records must demonstrate the relationship between actual plant generation and the electricity schedule used for the import. Missing or inconsistent confirmations can undermine the documentation needed to support the claimed emissions treatment.
Montenegro–Italy Presents Different Network Conditions
The Montenegro–Italy corridor operates in a different setting because electricity can be transmitted through the undersea CGES–Terna interconnection. Commercial traders need to establish how the relevant market zones, allocated transmission rights and nomination requirements interact with dispatch at the generating installation in Montenegro.
The physical interconnector offers an export route, but its existence does not establish that every element of the route between the generating plant and the EU border satisfies CBAM requirements. Cable availability and the absence of congestion across the relevant network route are separate considerations.
Consequently, evidence of interconnector access alone may not establish compliance. Traders must retain the relevant allocation and scheduling records and assess them against the conditions applicable to the specific electricity delivery.
Aggregated Portfolios Must Preserve Installation-Level Attribution
Portfolio aggregation creates another documentation challenge. Trading desks may offset purchases from several generating installations against a single physical import position to improve commercial netting efficiency.
However, the importer must still demonstrate which portion of the final imported volume is attributable to each installation for which actual-emissions treatment is claimed. Portfolio-level reconciliation cannot replace the installation-specific attribution required by the applicable rules.
Information systems should prevent the same nominated megawatt-hour from being assigned to multiple claims. They should also distinguish between cancelled, amended and superseded schedules so that the compliance record reflects the final accepted position rather than an earlier version.
Proposed EU Changes Do Not Yet Remove Existing Evidence Requirements
An EU legislative proposal would remove or revise some of the current physical-network constraints. As of October 2026, the reform remains a proposal, rather than an enacted change permitting traders to discontinue existing congestion and nomination evidence collection.
Until the applicable legal requirements change, maintaining records to the current standard remains necessary. Contracts can nevertheless include provisions allowing administrative requirements to be adjusted if future legislation changes the evidence needed to qualify imported electricity.
Transmission-capacity teams and CBAM compliance teams therefore need to work from a shared record of commercial positions, allocations, nominations and generation volumes. The economic assessment of an interconnector increasingly involves more than auction fees and congestion rents: a missing nomination confirmation can create a carbon-cost exposure that exceeds the original capacity fee.
