Scheduled electricity exports from Serbia to Hungary more than doubled in the second quarter of 2026 as regional trading consolidated around a new northbound corridor serving Hungarian and Ukrainian demand.
Commercial flows from Serbia to Hungary rose 111% year on year, while electricity scheduled from Romania to Hungary increased 156%, Energy Community data showed.
The shift followed a major reconfiguration of Southeast European electricity trading after the definitive phase of the EU Carbon Border Adjustment Mechanism began on January 1.
During the first quarter, exceptional hydro production pushed electricity north from Greece and Albania through Montenegro, Bosnia and Herzegovina and Serbia. In the second quarter, the hydro surplus weakened, but the region did not return fully to its earlier trading configuration.
Ukraine appears to be emerging as an important destination for surplus regional electricity. Hungary’s position as a hub connecting Southeast European supply with Ukrainian demand has strengthened the commercial importance of the Serbian border.
The trend could increase the value of Serbia-Hungary cross-border capacity, particularly during periods of Ukrainian import demand, constrained domestic generation or wider Central European price spreads.
However, it also exposes a growing difference between commercial schedules and physical electricity flows.
On the Bosnia-Croatia border, for example, physical exports reached about 824 GWh in the second quarter, compared with only 282 GWh commercially scheduled. Physical flows increased even as scheduled volumes fell.
The network continues to carry electricity along the path determined by system conditions rather than the contractual origin declared in a trade. That divergence can require larger operational-security margins, redispatch and countertrading.
CBAM makes the mismatch commercially sensitive. The carbon obligation follows the declared origin and import arrangement, while the transmission system cannot physically preserve the identity of individual megawatt-hours.
Serbia’s role is therefore becoming more complex. It is simultaneously a generation market, importer, exporter and transit system between the southern Balkans, Hungary and Ukraine.
The northbound corridor may give Serbian traders new opportunities, but it also raises the importance of documented capacity nominations, transit arrangements and clear contractual allocation of CBAM exposure.
What was once primarily a price-spread trade is becoming a combined test of carbon origin, cross-border scheduling and network reality.
