Serbia’s recent electricity-price discount to Hungary has nearly disappeared, with SEEPEX rising to €195.99/MWh and HUPX falling to €198.98/MWh. The resulting cross-border spread compresses to just €2.99/MWh. Two days earlier, Serbian electricity traded around €41/MWh below Hungary.
SEEPEX increased by around €18.2/MWh for Sept. 23 delivery. The change was driven particularly by expensive off-peak hours, with the Serbian off-peak average reaching roughly €211.8/MWh. The peak block eased even as off-peak prices rose.
Off-peak electricity is normally cheaper than peak power, but tight overnight or early-morning supply can reverse that relationship. The convergence reflects how quickly regional trading opportunities can disappear when domestic balances, renewable output and cross-border flows shift.
Cross-border arbitrage and market coupling outlook
The Serbia-Hungary spread is commercially important because the two markets are directly connected and HUPX is one of the principal regional price references for Serbian traders. When Serbian power trades substantially below Hungary, available cross-border capacity can create significant export value. At a spread of only €3/MWh, much of that opportunity disappears after transmission costs and trading expenses.
The move also highlights limits in assuming Serbia will systematically trade below EU markets. Serbia has substantial coal and hydro generation and rapidly growing wind and solar capacity, but its electricity balance can change quickly based on plant availability, hydrology and demand.
Hungary faces similar volatility, including because its more than 8 GW of solar produces large daytime surpluses but limited evening flexibility. That pattern can generate wide spreads one day and near convergence the next.
The development reinforces the role of flexible assets, including batteries, hydro reservoirs and cross-border trading portfolios that can respond to hourly and geographic price differences. Traditional baseload strategies become less effective when price relationships shift rapidly.
Serbia is targeting deeper European electricity-market integration and eventual market coupling around 2028. Coupling is expected to allocate cross-border capacity more efficiently and reduce some persistent price differences, though it will not eliminate scarcity or congestion.
Even coupled European markets can diverge sharply when transmission capacity is fully used. The Sept. 23 market shows Serbia and Hungary effectively trading at the same baseload price after being separated by more than €40/MWh only two days earlier.
In increasingly volatile Southeast European markets, a geographic price advantage can disappear almost as quickly as an hourly one.