Market coupling and cross-border capacity expansion were central to efforts to converge national power systems into a single Southeast European market, according to Electricity.Trade. Data emerging during 2026 points to a different pattern as prices and trading conditions diverge across physically interconnected areas. Throughout May, average electricity prices varied widely between countries.
Average prices ranged from €81.16/MWh in Albania to €104.53/MWh in Hungary, a spread of more than €23/MWh between markets that remain interconnected. Montenegro averaged €83.92/MWh, North Macedonia €82.66/MWh, and Greece €85.81/MWh. Serbia averaged €91.95/MWh, Bulgaria €97.41/MWh, Croatia €101.52/MWh, Slovenia €101.15/MWh and Romania €103.64/MWh.
Southern Renewable Discount Zone pricing and generation profile
The first market zone is described as the Southern Renewable Discount Zone, covering Albania, Montenegro, North Macedonia and increasingly Greece. The common feature is a growing share of renewable generation that is abundant during specific periods of the day. In Albania, hydropower dominates output.
Albania generated 3,647 GWh in the first quarter of 2026, with approximately 93% of electricity production from hydropower. Exports rose to 1,503 GWh, more than doubling year-on-year. During periods of strong rainfall, Albania is positioned as one of Europe’s cheaper renewable electricity producers.
Montenegro’s wholesale price environment is also linked to hydrological conditions. Its hydro fleet, combined with growing renewable imports and access to the Adriatic trading corridor, has placed downward pressure on wholesale prices. North Macedonia remains more dependent on imports but increasingly sources renewable-driven electricity from neighboring systems rather than thermal generation.
Greece’s role within the zone has changed over the past five years as it became one of Europe’s fastest-growing solar markets. Gigawatts of photovoltaic capacity have entered operation, and during sunny spring and summer days solar output suppresses wholesale prices across large parts of the day. The resulting effect is that solar generation increasingly reduces the value of solar generation.
The southern zone shows a pattern where renewable output grows while average power prices weaken. Battery storage, pumped hydro facilities, demand response providers and dispatchable hydro operators are identified as primary beneficiaries under these conditions.
Balancing platform around Serbia, Bulgaria and Romania
A second zone is emerging around Serbia, Bulgaria and Romania as these countries increasingly function as Southeast Europe’s balancing platform, reports Electricity.Trade . The structure is linked to how systems absorb volatility from neighboring markets while maintaining their own generation mix.
Romania combines significant hydro generation, expanding wind capacity, rapidly growing solar projects and nuclear generation from Cernavoda. The country trades simultaneously with Hungary, Serbia, Bulgaria and Moldova and is described as one of the region’s most important balancing markets.
Romania’s average electricity price was €103.64/MWh during the second half of May, remaining substantially above prices in Albania or Montenegro despite abundant renewable generation . The difference is attributed to Romania’s balancing role as the system increasingly absorbs volatility from neighboring markets.
Bulgaria is described as performing a similar function within this balancing zone. It combines nuclear generation from Kozloduy with thermal generation, expanding solar capacity and one of Europe’s fastest-growing battery storage pipelines . Bulgaria is also characterized as an increasingly important corridor connecting Romanian, Greek, Turkish and Serbian electricity flows.
Serbia is positioned at the centre of regional transmission infrastructure in this framework . Electricity flows moving from Romania toward Bosnia and Herzegovina, from Hungary toward North Macedonia or from Bulgaria toward Montenegro frequently pass through Serbia’s system.
The country’s central position is linked to commercial value alongside domestic demand from large industrial consumers including HBIS and Linglong, plus mining operations and manufacturing facilities . As renewable penetration rises across Southeast Europe, balancing services are described as becoming more valuable because markets able to absorb volatility command pricing power.
Northern anchor: Croatia, Slovenia and Hungary
The third zone consists of Croatia, Slovenia and Hungary . These markets are described as being influenced less by Balkan renewable dynamics and more by Central European fundamentals.
Hungary illustrates this shift most clearly: despite physical interconnection with Southeast Europe, its market reflects Central European pricing conditions including gas costs, carbon prices and industrial demand patterns . During May it averaged €104.53/MWh, the highest among major regional markets.
Slovenia benefits from the stabilizing effect of the Krško Nuclear Power Plant along with deep integration with Austria and Italy and mature cross-border trading infrastructure . Croatia occupies an intermediate position: it remains influenced by Balkan renewables while staying heavily connected to Central European market structures through Slovenia and Hungary.
This configuration results in a premium pricing zone described as serving as Southeast Europe’s northern anchor . Within the three-zone structure described for 2026 data, renewable electricity is increasingly produced in the south while balancing services are increasingly supplied in the centre and price formation occurs in the north.
Implications for asset economics and transmission investment
The changing structure affects how asset value is assessed across locations rather than only annual output maximization . A solar project in Albania is described as facing different economics than a solar project in Hungary under these conditions.
Batteries are also framed through location-based revenue differences: a battery project in Serbia may generate higher revenues than a comparable battery in Greece because it participates in balancing multiple interconnected systems . For Montenegro reservoir hydro assets, value capture may shift toward exporting electricity toward Italy during evening peak periods rather than maximizing annual generation.
A wind project in Romania is described as potentially more valuable than a solar project with similar output because wind aligns better with high-price hours . Transmission infrastructure is also described as becoming strategic within this framework compared with earlier focus on generation capacity.
The next decade is framed around moving electricity rather than producing it . Grid expansion projects in Romania, Bulgaria and Greece; interconnector upgrades across the Balkans; and increased investment in digital network management are cited as reflecting accelerating transmission investment tied to new arbitrage opportunities created by additional interconnection capacity between the Southern Renewable Discount Zone and the Central European Premium Zone .
The challenge identified for Southeast Europe shifts away from generating more renewables toward transporting value from where electricity is abundant to where it remains expensive . The same framework describes specialization across countries into roles such as renewable exporters, balancing hubs and premium demand centres for investors, traders utilities and industrial consumers that align with those functions .
