Across Central and South-East Europe, SEE power prices surged on 18/5 as wind output collapsed and regional demand rebounded. On 20/5, SEE power markets reversed sharply lower as renewable output expanded. On 21/5, prices stabilized after wind output surged and regional imports collapsed. On 22/5, markets reversed higher again as solar weakness and import dependence lifted regional prices.
Electricity policy and generation updates
Bulgaria ordered a partial shutdown of the Bobov Dol power plant over environmental breaches on May 22, 2026. The Bulgaria Supreme Court also annulled a pollution exemption for TPP Maritsa East 2 on May 20, 2026. In Greece, the coal era ended with the closure of Agios Dimitrios on May 18, 2026.
In Albania, electricity production surged in Q1 2026 driven by hydropower growth and rising exports on May 22, 2026. Romania reported higher electricity production despite lower consumption in Q1 2026 on May 18, 2026. Romania also recorded higher electricity production despite lower consumption in Q1 2026 on May 18, 2026. Croatia recorded a decline in electricity production and an increase in energy imports on May 18, 2026.
Serbia’s grid modernization advanced through smart metering and digital infrastructure upgrades on May 21, 2026. Serbia was also described as emerging as the strategic flexibility hub of Southeastern Europe’s new electricity market on May 20, 2026. Slovenia introduced a new electricity sharing model for surplus solar power on May 19, 2026.
Nuclear, hydro and wind project financing
Romania advanced nuclear modernization at Cernavodă, with Nuclearelectrica completing a major construction milestone for Unit 1 refurbishment on May 20, 2026. Slovenia’s NPP Krško slightly exceeded its April 2026 electricity production plan on May 19, 2026. Romania’s Doicesti SMR project faced criticism over costs and viability on May 19, 2026.
Hidroelectrica signed a €188.5 million refurbishment deal to restore capacity at the Raul Mare Retezat hydropower plant on May 22, 2026. Montenegro approved construction of SHPP Otilovići on May 19, 2026.
In wind development, Rezolv Energy sought EBRD financing for a 315 MW onshore wind project in Romania on May 22, 2026. Bosnia and Herzegovina’s FBiH advanced an environmental review for a 100 MW Gradina wind farm near Tomislavgrad on May 21, 2026. Greece advanced offshore wind preparatory work through a new SPV for large-scale survey development on May 20, 2026.
Gas corridor upgrades and LNG-related debate
A Serbia gasification project expanded to €86.8 million, with infrastructure rollout accelerating under state backing on May 22, 2026. Croatian and Slovenian gas operators expanded the Rogatec interconnection to strengthen regional energy connectivity on May 21, 2026.
The Vertical Gas Corridor initiative progressed with upgrades aimed at boosting gas connectivity and LNG supply on May 19, 2026. Regional energy cooperation expanded through the same Vertical Gas Corridor initiative on May 18, 2026. In parallel, an US LNG strategy reshaped the Balkan energy debate as Montenegro considered gas plants and an LNG terminal in Bar on May 21, 2026.
Trading shifts tied to CBAM and cross-border flows
Southeast Europe’s power markets entered a new volatility cycle as renewable swings reshaped regional pricing from May 24 onward. Cross-border flows, carbon costs and CBAM began rewiring Southeast Europe’s power pricing model on May 24, while SEE power markets also reversed higher or lower across multiple sessions tied to solar weakness or renewable expansion. Battery storage economics were also reported as beginning to rewrite Southeast Europe’s power markets.
CBAM repricing and negative price episodes in SEE trading model
The CBAM quarterly report for Q1 2026 described structural fractures emerging across Southeast Europe’s electricity market on May 22. CBAM began quietly repricing Southeast Europe’s electricity economy on May 22 as negative prices and renewable volatility reshaped trading. Negative prices reached the Balkans as solar expansion reshaped SEE power trading on May 19.
Curtailment risks and grid constraints highlighted in market coverage
The reporting period also included renewables curtailment emerging as a hidden cost of the SEE energy transition alongside references to the Balkan grid approaching a congestion decade. Renewable curtailment was discussed alongside shifting marginal price setters including gas returning as the marginal price setter in SEEMay (May) not specified beyond the dated entry of May 19.
Fuel market measures across oil supply chains and reserves
Bulgaria’s Competition Commission proposed emergency measures to stabilize the fuel market amid geopolitical pressure and price volatility on May 20, while also seeing its Supreme Court annul a pollution exemption for TPP Maritsa East 2 earlier in the period. Serbia reduced fuel excise tax relief to 20%, adjusting policy amid global oil price pressure on May 20. Hungary faced potential fuel price pressure as strategic reserves neared expiry alongside global oil market risks persistently noted for May 21.
NIS upstream investment and pipeline contract details
Serbia’s oil company NIS invested €41.8 million in upstream expansion and boosted production in Q1 2026 on May 20. Serbia sought agreement with MOL as an OFAC deadline neared for NIS ownership restructuring on May 18. Serbia awarded a contract for a strategic oil pipeline connecting Hungary on May 19.
Strategic reserve releases in Greece and Hungary; diesel demand in North Macedonia
Greece began strategic fuel reserve release to stabilize the energy market on May 19 while Hungary released strategic fuel reserves to stabilize domestic energy market also dated to May 18. North Macedonia reported that diesel dominated fuel consumption in 2025, amid rising energy demand and import dependence on May 22.
Southeast Europe investment cycle: batteries, grids and carbon costs
Batteries, grids and carbon costs were cited as redefining Southeast Europe’s energy investment cycle from May 24 onward alongside battery storage and renewable megaprojects accelerating across Southeast Europe. Croatia’s Pantheon AI campus in Topusko was linked with major transmission infrastructure investment estimated at 400–450 million euro, dated to May 21.
Mines policy links to CBAM; regional corporate results mentioned alongside power developments
The period also covered mining-related CBAM impacts including Serbia’s mining sector becoming Europe’s new strategic battleground dated to May 24, . CBAM was described as reshaping Serbia’s mining industry as carbon intensity became a competitive risk dated to May 21 . Middle Island expanded Serbian polymetallic discovery with antimony gaining strategic importance in Europe dated to May 21 .
EPCG profit growth; coal plant financial instability; grid modernization via metering upgrades
EPCG reported strong Q1 2026 profit growth , driven by higher hydropower output dated to May 18 . Coal plants were described as becoming financially unstable across the Western Balkans dated to May 19 . Serbia’s EDF and EDS advanced grid modernization through smart metering and digital infrastructure upgrades dated to May 21 .
Mainstreaming flexibility: Serbia ownership talks alongside electricity economy concerns
The period included continued efforts by Serbia to resolve NIS ownership uncertainty as negotiations stalled and a deadline approached dated to May 21 . SEEPEX negative pricing was reported as threatening to reshape Serbia’s entire electricity economy dated to May 21 . Romania’s Romgaz reported higher Q1 2026 profit , despite falling production and revenue decline dated to May 20 .
