South East Europe’s electricity market is moving from a fragmented trading landscape toward a more exchange-based regional architecture. The transition is not yet complete, and the region remains divided between EU-coupled markets and Western Balkan markets that are gradually integrating. Organized spot markets, intraday trading, market coupling, and regional exchange consolidation are increasingly central to electricity price formation.
ADEX consolidates day-ahead and intraday trading across three countries
The Alpine-Adriatic Danube Power Exchange, ADEX, is the most significant institutional development described for the region. ADEX was created by integrating BSP SouthPool, SEEPEX, and HUPX, covering Slovenia, Serbia, and Hungary. It operates day-ahead and intraday electricity markets and also provides clearing, market data, and guarantees-of-origin services.
ADEX is positioned as a bridge between Central Europe, South East Europe, and the Western Balkans through its cross-border exchange role. In the regional context described, power exchanges are not only trading venues but also market-integration infrastructure. They generate reference prices, support balancing mechanisms, improve transparency, and prepare national markets for coupling with the wider European electricity system.
Key benchmarks in Hungary and Romania
Hungary’s HUPX remains one of the most important regional benchmarks. Its relevance is linked to Hungary’s strategic position between Central Europe, Romania, Serbia, Croatia, Slovakia, Austria, and Ukraine-linked power flows. For many market participants, HUPX functions as a benchmark for assessing regional basis risk.
Romania’s OPCOM is another key market anchor in the day-ahead and intraday coupling framework. OPCOM is Romania’s nominated electricity market operator for day-ahead and intraday market coupling. It also operates as a registered reporting mechanism under REMIT for more than 450 companies active in Romania’s electricity and gas sectors.
Bulgaria and Croatia expand exchange connectivity
Bulgaria’s IBEX occupies a central position because Bulgaria sits at the intersection of Romania, Greece, Serbia, North Macedonia, and Türkiye-linked regional dynamics. The exchange develops day-ahead, intraday, and bilateral electricity markets. Its role is described as becoming more important as Bulgaria faces renewable growth exposure, energy storage deployment, and expanding north-south power flows.
Croatia’s CROPEX connects the Adriatic market with Slovenia and Hungary. Its day-ahead market is coupled across both the Croatian-Slovenian and Croatian-Hungarian borders within the European Single Day-Ahead Coupling framework. This arrangement places Croatia as a gateway linking Central Europe, the Adriatic region, and Western Balkan trading routes.
Western Balkan exchanges: SEEPEX within ADEX, ALPEX coupling milestone
Within the Western Balkans, Serbia’s SEEPEX is described as the most advanced exchange. SEEPEX now operates as part of the ADEX structure. Serbia remains the region’s most important non-EU electricity market due to its size, central geographic position, coal-based generation fleet, expanding wind capacity, and growing alignment with EU market rules.
SEEPEX introduced negative electricity prices in 2026 as a step toward EU-style market behavior. Albania’s and Kosovo’s exchange activity is handled by ALPEX, which operates both Albanian and Kosovar day-ahead and intraday electricity markets. The Albania-Kosovo day-ahead market coupling was launched on 31 January 2024 and was described by Europex as the first coupling of its kind within the Energy Community.
North Macedonia’s intraday launch; remaining integration gaps
North Macedonia’s MEMO is progressing with intraday market development. Its intraday market launched on 6 May 2026. The Energy Community recognized the launch as an important step toward renewable energy integration and closer alignment with the EU internal electricity market.
The remaining challenge described is achieving full regional integration across Western Balkan systems. Bosnia and Herzegovina still lacks the same level of organized exchange-market maturity seen elsewhere in the region. Montenegro continues to develop its market architecture, while Kosovo and Albania remain coupled with each other but are not yet fully integrated into the wider EU market; Serbia is described as a front-runner among larger Western Balkan systems despite an incomplete transition.
Market effects: transparency gains alongside price spreads
The investment and trading implications outlined focus on changes in transparency without full convergence across South East Europe. Exchange-based pricing is improving market visibility while cross-border constraints continue to affect outcomes. Differing regulatory frameworks and uneven liquidity are cited as factors that generate substantial price spreads across the region.
The participants identified as positioned to benefit are those able to interpret both layers of the electricity system: the exchange screen and the physical transmission network behind it. In South East Europe, a price is described as reflecting grid capacity signals alongside weather patterns, hydro conditions, carbon-cost treatment, market liquidity, and regulatory integration levels.