April cross-border power flows in Southeast Europe signal rising fragmentation

April trading patterns across Southeast Europe pointed to a gradual weakening of regional market integration, with cross-border electricity volumes falling and directional balances shifting. For investors and utilities that depend on cross-border price arbitrage, the change matters because it alters both revenue potential and system flexibility—especially for export-oriented producers.

Arbitrage still exists, but exports no longer track price spreads

Historically, SEE markets have relied on price arbitrage to move power across borders: lower-cost generation from the Western Balkans has flowed toward higher-priced EU markets such as Italy, Austria and Hungary. In April, however, that transmission of price signals into physical flows weakened markedly. Even though price spreads remained in place—averaging roughly €25–30/MWh between Western Balkan markets and neighboring EU zones—export volumes did not respond proportionally.

Italy exports fell; eastern demand rose modestly

One of the clearest indicators was a reduction in exports toward Italy, where flows declined by about 333 MW on average. At the same time, exports toward Ukraine and Moldova increased modestly, suggesting a reorientation toward eastern demand centers rather than the usual pattern of EU-bound trading.

Carbon-related adjustments are reshaping trade economics

The structural driver behind this shift is the introduction of carbon-related adjustments on cross-border electricity trade. New carbon cost mechanisms add additional charges on electricity entering EU markets. Importantly, these costs are applied using standardized emission assumptions rather than actual generation profiles, which can distort competitiveness.

As a consequence, electricity produced from low-cost but carbon-intensive sources in the Western Balkans faces reduced access to EU markets even when underlying price spreads remain favorable. The system also does not fully differentiate between clean and fossil-based generation in neighboring countries, creating unintended effects for renewable exports as well.

Lower trading activity raises risks for export-dependent systems

The immediate outcome has been a decline in overall cross-border trading activity—estimated at around 25% compared with prior periods—signaling a breakdown in traditional market coupling dynamics. This is particularly consequential for export-oriented systems such as Montenegro and Bosnia and Herzegovina, where cross-border sales are described as an important revenue stream.

Intra-SEE exchanges persist but cannot fully absorb surplus

While internal SEE flows have become more pronounced, they remain smaller in scale than the region’s traditional EU-linked exchanges. Trading between Balkan markets—such as Serbia, Bosnia, North Macedonia and Albania—continues to be supported by geographic proximity and aligned regulatory frameworks. However, these intra-regional flows are less capable of absorbing surplus generation during high-output periods.

Fragmentation could increase curtailment and volatility without regulatory alignment

From a system perspective, reduced integration with EU markets limits SEE’s ability to export excess renewable generation, increasing the likelihood of curtailment. It also reduces access to cheaper imports during tight supply conditions, which can raise volatility.

Looking ahead, the trajectory of cross-border flows will depend heavily on regulatory alignment. Without mechanisms that recognize actual carbon intensity and integrate SEE markets more fully into EU frameworks, the region risks evolving into a semi-isolated trading zone—characterized by lower liquidity and higher price volatility.