Courtesy of Virtu.Energy
Cross-border electricity flows emerged as one of the defining features of Southeast Europe’s power market in Week 42, as national trading positions shifted significantly despite only a marginal change in the region’s overall net import balance.
Combined net electricity imports rose by just 0.4% to 1,194.36 GWh, but this relative stability masked substantial differences between individual markets. Greece strengthened its position as a major exporter, increasing net exports by 143.88% to 198.49 GWh. Serbia moved in the opposite direction, with net imports climbing from 12.16 GWh to 96.58 GWh. Hungary’s net imports increased by 34.22% to 279.71 GWh, while Bulgaria’s export surplus almost disappeared, falling by 97.8% to just 3.56 GWh. Romania reduced net imports by 59.06% to 77.57 GWh, while Croatia lowered its import requirement by 20.65% to 119.57 GWh.
These changing trade positions are becoming increasingly important in determining the commercial value of electricity generation. Generators are no longer influenced solely by conditions in their domestic markets. Their revenues also depend on whether available cross-border transmission capacity allows electricity to reach neighbouring markets where prices are higher.
Week 42 illustrated this dynamic particularly clearly along the corridor between Greece and the northern Balkans. Greek electricity prices were considerably lower than those in Bulgaria, Romania, Serbia and Hungary, while Greece simultaneously increased its net exports. Nevertheless, substantial price differences persisted across the region, indicating that transmission constraints and other market limitations prevented electricity flows from fully eliminating price disparities.
For traders, persistent price spreads create opportunities to improve congestion forecasting and secure cross-border transmission capacity. For transmission system operators and policymakers, they provide important signals about where additional network investment could deliver the greatest economic benefits. The ability to move electricity efficiently between markets is becoming almost as important as the ability to generate it at competitive cost.
The implications are equally significant for renewable energy developers. Wind and solar projects connected to structurally congested areas may face periods of depressed local prices, even when neighbouring markets experience much higher prices. By contrast, projects with access to stronger interconnections may be able to benefit from a broader regional market, improving their potential revenue opportunities and reducing exposure to local price volatility.
These developments are particularly relevant to the Western Balkans. Serbia occupies a strategic position between Central Europe and neighbouring electricity systems in Romania, Bulgaria, Bosnia and Herzegovina, Montenegro and North Macedonia. Its long-term electricity-market competitiveness will therefore depend not only on new domestic generation capacity but also on the efficiency and reliability of electricity exchanges with neighbouring countries.
Montenegro also has a strategically important role in regional power trading, as its transmission system provides a direct connection between the Western Balkans and Italy through a subsea electricity interconnector. This infrastructure creates opportunities for cross-border trading while strengthening the region’s links with the wider European electricity market.
The growing importance of cross-border flows also reinforces the commercial rationale for electricity storage. Storage assets can help manage exposure to constrained transmission interfaces during expensive hours, while absorbing electricity from domestic renewable generation or imports when market conditions are more favourable. Their value will depend on price spreads, network constraints, charging opportunities and the availability of sufficient transmission capacity.
Week 42 demonstrated why electricity-market analysis in Southeast Europe cannot be limited to national generation and consumption figures. Serbia’s rising imports, Greece’s expanding exports and Bulgaria’s sharply reduced surplus were interconnected developments within the same regional market balance.
As renewable generation expands and electricity systems become more dependent on variable output, these relationships are likely to become increasingly dynamic. The future competitiveness of Southeast Europe’s electricity market will depend on where power is generated, when it becomes available and whether sufficient transmission capacity exists to deliver it to the markets where it commands the highest price.
Courtesy of Virtu.Energy
