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%, according to Energy Community data . The changes reflect how cross-border volumes are being arranged alongside shifting physical delivery patterns.
Trading reconfiguration after EU CBAM’s definitive phase
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. The timing coincided with changes in how electricity movements were scheduled across the region. As a result, commercial schedules increasingly aligned with a corridor focused on northbound flows.
In 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. The persistence of the new pattern continued to shape northbound deliveries into Hungary.
Ukraine demand and the role of Hungary’s hub
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 . This has increased attention on how capacity is used during periods when demand is directed further north.
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. At the same time, it exposes a growing difference between commercial schedules and physical electricity flows. That divergence becomes more visible when comparing declared schedules with actual network outcomes.
Gap between scheduled volumes and physical flows
On the Bosnia-Croatia border, 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 paths determined by system conditions rather than contractual origin declared in a trade.
This divergence can require larger operational-security margins, redispatch and countertrading. CBAM makes the mismatch commercially sensitive because the carbon obligation follows declared origin and import arrangement, while the transmission system cannot physically preserve the identity of individual megawatt-hours . As a result, scheduling decisions can have implications beyond market pricing.
Serbia’s changing market function across borders
Serbia’s role is becoming more complex as it operates simultaneously as a generation market, importer, exporter and transit system between the southern Balkans, Hungary and Ukraine. The northbound corridor may create new opportunities for Serbian traders while increasing the importance of documented capacity nominations and transit arrangements . Clear contractual allocation of CBAM exposure also becomes more central as commercial scheduling diverges from physical routing.
What was once primarily a price-spread trade is becoming a combined test of carbon origin, cross-border scheduling and network reality . The interaction between these elements affects how trades are structured across Serbia’s borders with Hungary and onward movements linked to Ukrainian demand.
