South East European day-ahead electricity markets moved sharply higher for delivery on 13 May, with regional pricing lifted by collapsing imports from CORE European markets, tighter interconnection spreads and stronger evening balancing pressure. Hungary’s HUPX climbed to €136.54/MWh, while Romania’s OPCOM reached €137.18/MWh. Serbia’s SEEPEX stayed comparatively insulated at €110.80/MWh, keeping a relative discount versus Hungary and Romania.
Import compression and cross-border price signals
The market structure increasingly reflects a regional decoupling pattern. Imports into the wider SEE and Hungarian region fell to only 220 MW net, down more than 2 GW day-on-day, while CORE-linked imports from Austria and Slovakia also dropped sharply. The reduction in cross-border availability reduced arbitrage pressure from Western and Central Europe.
Alongside the import decline, the Hungary-Germany spread remained elevated at roughly €23/MWh. That level maintained incentives for continued eastward price support.
Wind rebound shifts balancing conditions
Generation fundamentals pointed to a shift back toward wind-supported balancing conditions after several solar-heavy trading sessions earlier in the week. Regional wind generation rose by more than 1.2 GW day-on-day to 3.37 GW, partially offsetting declines in gas-fired generation and reduced solar production.
Solar output dropped by nearly 700 MW, while gas generation declined by approximately 576 MW. The changes suggested thermal operators were reducing daytime dispatch exposure under volatile intraday price structures.
Hydro, coal and nuclear shares in the mix
Hydro conditions remained structurally supportive but not dominant in the regional generation mix. Hydro accounted for approximately 23%, while coal represented 15% and gas 12%. Nuclear contributed steadily at around 2.8 GW.
The balancing picture indicated a transition regime in which wind volatility, rather than solar saturation, became the dominant short-term driver during shoulder hours and evening ramps.
Serbia’s day-ahead pricing remains comparatively stable
Serbia’s pricing behavior differed from the broader benchmark move. Despite stronger regional levels, SEEPEX increased by only €0.2/MWh day-on-day.
The relatively small change reflected continued local balancing stability and resilient domestic generation positioning, alongside weaker exposure to broader Central European volatility. Serbia also remained structurally influenced by Hungarian pricing formation through regional flow mechanics and cross-border congestion economics.
Commercial flow data showed heavy directional exports and imports around Hungary and Romania. Serbia maintained active balancing exchanges with Bosnia, Croatia and Hungary.
Intraday curve pattern: midday lows and evening spikes
Intraday hourly curves showed a consistent pattern across the region. Midday solar suppression continued to create lower-priced hours between approximately H13-H16.
Evening ramp pricing intensified significantly toward H21-H24 across HUPX, OPCOM and CROPEX. Romania again recorded the strongest evening spikes, with hourly prices approaching €290/MWh, indicating ongoing flexibility shortages in the regional balancing structure.
Forward markets ease as spot strength holds
Forward markets softened despite higher spot prices. Hungarian Week-21 contracts eased to around €124.5/MWh, while June and Calendar-2026 contracts also drifted lower.
Gas markets continued weakening, with Austrian CEGH June contracts falling toward €21.5/MWh. EUA carbon contracts stayed relatively firm near €75.8/t, maintaining pressure on coal generation economics across the region.
A summer transition shaped by wind volatility and grid constraints
The broader structural picture pointed to a more volatile summer transition phase across SEE. Wind output volatility, negative-price exposure during high-solar hours, declining thermal flexibility and tighter interconnection economics were beginning to reshape regional dispatch behavior.
This shift was expected to matter ahead of the first full summer season following negative pricing mechanisms introduced across parts of the SEE trading architecture, including Serbia’s evolving market integration framework.
Regional infrastructure updates: wind, storage, grids and industrial incentives
Several strategic infrastructure developments were announced across the region. Montenegro advanced both the 64.8 MW Momce wind farm and a new partnership between EPCG and Japan’s PowerX targeting roughly 500 MWh of battery storage deployment.
Hungary’s E.ON completed a €322 million grid modernization program focused heavily on renewable integration capacity. Romania accelerated both PPA-driven renewable deployment and gas-processing industrial incentives tied to future Black Sea production growth.
Differing intraday value supports flexibility-oriented strategies
The current market configuration increasingly rewarded flexibility rather than baseload positioning alone for traders and utilities. BESS projects, fast-ramping hydro, interconnection optionality and sophisticated intraday optimization were becoming central revenue drivers.
The widening divergence between midday and evening pricing profiles indicated that capture-price risk management would become more important for renewable operators across SEE during the remainder of 2026.