Serbia’s electricity system is acquiring a more important regional role as commercial flows move northwards towards Hungary and, potentially, onwards to Ukraine.
Scheduled exports from Serbia to Hungary increased 111% year on year during the second quarter of 2026, reaching approximately 788 GWh compared with 374 GWh a year earlier. The increase occurred even as aggregate Western Balkan exports to the EU declined by 16% and gross regional exchange contracted.
The strengthening of the corridor cannot be explained by the Serbia–Hungary price spread alone. Hungary averaged around €12.9/MWh above Serbia, significantly narrower than the roughly €33/MWh difference recorded in the first quarter. Serbia also carries a national CBAM default factor of 1.041 tCO₂/MWh, implying an estimated cost of €78.37/MWh at the Q2 certificate price.
A larger demand centre appears to be shaping the trade. Hungary was the most important route for Ukrainian electricity imports during the quarter. Around 1,546 GWh of capacity was allocated through daily Hungary–Ukraine auctions, approximately 247% more than in Q2 2025. The auctions generated around €12.5 million, with offered capacity almost fully allocated.
The Energy Community Secretariat treats the connection as provisional because transit volumes cannot be isolated from aggregate commercial schedules. The regional flow pattern nevertheless supports the interpretation. Romania-to-Hungary schedules increased 156%, while electricity inside the Western Balkans increasingly moved from the south towards Serbia. Montenegro-to-Serbia flows rose 56%, North Macedonia-to-Serbia 46%, Albania-to-Kosovo 153% and Kosovo-to-North Macedonia 110%.
Serbia is therefore functioning as more than a domestic coal-based market. It is becoming a commercial collection point for electricity moving from the hydro-rich and renewable-rich south towards the Hungarian border.
This raises the strategic value of Serbian transmission infrastructure. Northbound flows increase the importance of the 400 kV and 220 kV network, border-capacity optimisation, phase-angle management, forecasting and balancing. They also heighten the cost of congestion and unplanned physical flows through the meshed network.
SEEPEX’s return to growth is consistent with this role. Day-ahead trading on the Serbian exchange increased 7% after contracting in Q1. Greater trading activity through Serbia can improve liquidity and price discovery, but the full commercial benefit depends on adequate capacity, transparent auctions and a grid capable of carrying both scheduled transactions and physical loop flows.
The corridor also creates opportunities for battery storage and flexible generation. Traders serving Hungarian and Ukrainian demand require short-term portfolio balancing, intraday response and reserve capacity. Serbia’s hydro assets, thermal fleet and future BESS portfolio could support that function, although carbon exposure will increasingly determine which sources can access premium EU demand.
The country’s position is commercially valuable but operationally demanding. Serbia can become a regional transit and balancing hub only if grid reinforcement keeps pace with northbound trade. The Q2 data show that the market has already started assigning Serbia that role.
