Trading data, generation patterns and investment flows are increasingly pointing to a structural shift in Southeast Europe’s electricity market. What had been treated as a relatively unified regional system is separating into three distinct electricity zones, each with different pricing mechanisms and commercial conditions. The change is reflected in May 2026 price movements across multiple exchanges.
Average power prices fell across the region, but the size of the declines varied by market. Albania’s ALPEX averaged €81.16/MWh, Montenegro’s BELEN €83.92/MWh, North Macedonia’s MEMO €82.66/MWh and Greece’s HENEX €85.81/MWh. Higher averages were recorded in Serbia’s SEEPEX at €91.95/MWh and Bulgaria’s IBEX at €97.41/MWh, while Romania’s OPCOM averaged €103.64/MWh.
Among the remaining exchanges, Croatia’s CROPEX reached €101.52/MWh, Slovenia’s BSP averaged €101.15/MWh and Hungary’s HUPX stood at €104.53/MWh. The pricing outcomes together indicate an emerging three-tier structure stretching from the Adriatic and Aegean toward Central Europe.
Southern Renewable Discount Zone: Albania, Montenegro, North Macedonia, Greece
The first group is described as the Southern Renewable Discount Zone, covering Albania, Montenegro, North Macedonia and Greece. These markets are increasingly shaped by renewable generation, especially hydropower and solar output. Albania is highlighted as an example of the trend.
During the first quarter of 2026, Albania generated 3,647 GWh, with about 93% of production coming from hydropower facilities. Electricity exports rose by more than 105% year-on-year to 1,503 GWh, indicating a growing role as a supplier of low-cost renewable electricity in the region.
Montenegro is said to benefit from strong hydro availability and increasing renewable imports from neighboring markets. Access to the Adriatic transmission corridor is also cited as a factor behind lower average prices. North Macedonia is described as benefiting from cheaper regional supply while moving toward European electricity market structures.
Greece is characterized as the most advanced case within this transformation due to continued additions of photovoltaic capacity. The expansion of solar generation is linked to frequent midday oversupply and daytime price suppression, creating revenue pressure for merchant renewable portfolios despite economic growth and electrification.
This southern zone increasingly values flexibility over standalone generation volume. Batteries, pumped storage facilities, flexible industrial consumption and export-oriented trading strategies are described as becoming more valuable than merchant solar output alone.
Core Balancing Zone: Serbia, Bulgaria, Romania
The second group forms what is increasingly referred to as Southeast Europe’s Core Balancing Zone, centered on Serbia, Bulgaria and Romania. Compared with the southern markets, these systems combine large industrial demand centers with extensive transmission infrastructure and thermal generation fleets. Nuclear capacity and growing renewable portfolios are also part of their generation mix.
The role attributed to these markets goes beyond producing electricity; it increasingly involves balancing within the regional system. Romania is presented as one of the most strategically important power systems in Southeast Europe due to significant hydro resources and expanding wind and solar portfolios alongside nuclear generation from Cernavoda.
Romania also has extensive cross-border interconnections with Hungary, Serbia, Bulgaria and Moldova. Even with falling prices during May 2026, Romania remained among the higher-priced markets at €103.64/MWh, consistent with its balancing function within regional power flows.
Bulgaria is described as relying on nuclear generation from Kozloduy, remaining coal-fired capacity and rapidly growing battery-storage investments. The country is also identified as one of Europe’s fastest-growing energy storage markets, adding flexibility that is expected to become more valuable as renewable penetration rises across Southeast Europe.
Serbia is described as sitting at the geographical and commercial center of the Balkan electricity network. Flows between Romania, Bulgaria, Hungary, Bosnia and Herzegovina, Montenegro and North Macedonia frequently transit through Serbia’s system.
Industrial consumers including HBIS, Linglong, mining companies and manufacturing facilities are cited as providing substantial and relatively stable demand inside this balancing area. As renewable output expands across the region, investment needs for balancing are expected to rise for batteries, ancillary services and balancing reserves alongside dispatchable hydro generation and flexible gas assets over the remainder of the decade.
Central Europe-Linked Premium Zone: Croatia, Slovenia, Hungary
The third group consists of Croatia, Slovenia and Hungary under a Central Europe-Linked Premium Zone description. Pricing signals in these markets are said to be increasingly influenced by developments in Austria, Germany and Italy rather than by renewable dynamics shaping the southern Balkans.
Hungary is highlighted as the most prominent example because HUPX prices continue to reflect Central European gas, carbon and industrial demand fundamentals despite interconnections with neighboring Balkan markets. In the second half of May 2026, Hungary averaged €104.53/MWh, making it the highest-priced market among major SEE exchanges.
Slovenia is described as benefiting from stabilizing influence from the Krško Nuclear Power Plant, strong interconnections and deep integration with Central European electricity trading hubs. Croatia is described as maintaining close physical and commercial links with Slovenia, Hungary and Italy, which reduces exposure to some renewable oversupply pressures seen further south.
The premium zone is also associated with stronger industrial demand and deeper financial liquidity compared with other parts of Southeast Europe. More developed forward markets and greater participation by international trading houses are also cited as factors supporting premium pricing conditions across these exchanges.
An emerging value chain across interconnected zones
The regional pattern described resembles an electricity value chain rather than a single conventional market system. Low-cost renewable generation is increasingly produced in the south while system balancing and transit services are increasingly provided in central areas.
Premium pricing signals and financial liquidity are described as remaining concentrated in northern parts of Southeast Europe within this structure. As electricity moves through interconnected systems from production areas such as Albania or Montenegro toward consumption points including Croatia or Hungary or Italy, transmission constraints, balancing requirements and market spreads determine how value changes along the route.
The same differentiation is applied to investment environments across countries within this framework. A solar project in Greece is described as facing a different commercial environment than one in Hungary; a battery installed in Serbia may generate more value than an equivalent battery in Albania due to its balancing role; a wind farm in Montenegro may capture premium evening prices exported through the Adriatic corridor.
Romanian storage projects are also described as potentially benefiting from balancing opportunities linked to expanding renewable capacity across the wider region. Overall market convergence into a single system is described as giving way to interconnected but differentiated regional markets with distinct economics and investment drivers across Southeast Europe.
