Trading conditions across Southeast Europe tightened between August 3 and August 9, 2026, with multiple reports pointing to supply pressure, hydrological stress and shifting generation patterns. Trading Note 3/8 on August 3 described a surge in regional prices tied to weekday demand, weak wind and hydrological stress. Trading Note 4/8 on August 4 said evening scarcity widened SEE power spreads as Hungary and Romania faced supply pressure.
Electricity trading signals and regional grid constraints
Reports on August 5 through August 8 tracked how solar output and evening demand affected price formation. Southeast Europe electricity market tightens after sunset as solar reshapes price formation was published on August 5, while Trading Note 7/8 on August 7 linked higher liquidity on HUPX to solar generation reshaping Hungary’s power curve. On August 6, Southeast Europe power market split widens as central markets face evening supply pressure.
Western Balkan flows were also highlighted as a divergence emerged between schedules and physical power movements. Western Balkan grid faces growing gap between commercial schedules and physical flows was published on August 8. The same day, Southeast European power prices converge as EU benchmarks fall was reported alongside Western Balkan electricity trading splits between local growth and weaker EU trade.
CBAM-related developments were placed alongside these market moves. CBAM starts to redraw Western Balkan electricity trade appeared on August 8, while Albania and North Macedonia face opposite CBAM dynamics at Greek border and Montenegro–Italy interconnector puts CBAM economics to the test were also published on August 8. CBAM costs outweigh wholesale spreads on Western Balkan power exports followed the same date.
Nuclear cooling limits and hydrology-driven generation adjustments
Nuclear availability changes were reported in parallel with drought-related constraints. Krško cuts output to 80% as drought tightens Sava cooling limits was published on August 6, while Krško’s reduced output reveals a voltage-control problem behind the energy shortage appeared on August 7. Southeast Europe’s nuclear drought stress test reveals the need for a new flexibility strategy was also published on August 7.
Romania’s Cernavodă site faced cooling-water concerns linked to Danube conditions. Romania: Danube intervention gives Cernavodă unit temporary cooling-water relief was published on August 6, followed by Romania: Nuclearelectrica turns to Ukrainian electricity as Cernavoda output falls on August 5. Romania engineers Danube diversion to protect remaining Cernavoda reactor was reported on August 5.
Bulgaria’s nuclear decommissioning schedule advanced as well. Bulgaria: Kozloduy decommissioning enters new ten-year dismantling phase was published on August 5.
Hydropower flexibility, permitting changes and drought impacts
Hydropower availability and operational flexibility were repeatedly referenced across the region during the week. North Macedonia preserves hydropower flexibility with reservoirs at 70% was published on August 6, while Serbia’s drought highlights growing importance of hydropower flexibility and storage capacity appeared the same day. Historic drought cuts Đerdap output and tightens Serbia’s electricity balance was reported on August 4.
Permitting risk in North Macedonia shifted following changes affecting hydropower assets. Removal of Šar Mountain hydropower plants resets North Macedonia’s permitting risk was published on August 7. In Bosnia and Herzegovina, Bosnia and Herzegovina: Višegrad hydropower output falls sharply as summer hydrology weakens appeared on August 5.
Slovenia’s hydropower trajectory also reflected seasonal contraction. Slovenian hydropower heads for steep July contraction was published on August 4, while Formin overhaul advances as Slovenia prepares €-scale Drava modernisation appeared on August 5.
Gas storage, pipeline projects and regulated pricing moves
Gas market coverage focused on winter risk signals from storage levels and ongoing infrastructure development. Europe’s weak gas storage refill raises winter price risk was reported on August 7. Europe’s winter gas balance is tightening before the heating season begins appeared on August 3.
Infrastructure planning included new capacity for security of supply across Southeast Europe. Vertical Gas Corridor evolves into long-term Southeast European energy security network was published on August 6, while Romania’s Black Sea strategy expands into a new gas, wind and energy security hub appeared on August 7. Greece: DEPA advances 792MW Larissa gas plant towards investment decision was reported on August 6.
National pricing adjustments were also covered alongside supply substitutions. Bulgaria raises regulated gas price after replacing Azerbaijani supply from Turkey was published on August 5, while Bosnia’s 14.42% gas price rise exposes the cost of single-supplier dependence appeared the same day. Enaon commits €1 billion to expand and digitise Greece’s gas networks followed on August 4.
Renewables deployment, storage adoption and interconnector finance
Renewables expansion continued alongside grid integration challenges and auction or infrastructure pacing issues. Montenegro’s renewable expansion outpaces auction and grid development was published on August 7, while Hybrid renewable projects emerge as solution to Europe’s growing grid constraints appeared on August 6. Southeast Europe’s renewable expansion faces a new grid challenge: Managing forced power oscillations was reported on August 7.
Household solar markets saw battery storage become standard in Romania. Romania: Battery storage becomes standard in household solar market appeared on August 6, while Montenegro’s EPCG–Masdar platform enters the execution test was published on August 4.
Nuclear-adjacent system constraints were not the only cross-border factor; interconnector financing also featured in the week’s coverage. Meridiam investment gives the Greece-Cyprus interconnector a new financial anchor appeared on August 7, alongside Germany backs Albanian grid and hydropower upgrades with €114mn financing package published on August 6.
Coal-linked supply shifts, oil logistics controls and trading volumes
Drought-related generation shifts extended beyond nuclear into thermal output patterns described for several countries. Bosnia maintains electricity supply as drought shifts generation towards coal was published on August 6, while Bosnia’s electricity surplus masks deepening coal sector and utility financial strains appeared on August 7. Croatia maintains system stability as drought increases dependence on imports followed on August 5.
Oil market reporting focused on river constraints affecting fuel imports into Serbia and operational measures for refineries. Serbia raises refinery output as low Danube restricts fuel imports appeared on August 6, while Serbia extends fuel tax relief and export controls amid supply concerns was published on August 5. Temporary US licence keeps NIS and the Pančevo refinery operating followed on August 4; Diesel, not crude, is becoming the sharper edge of the energy shock appeared on August 3.
Serbia-focused trading notes, corridor role and low-carbon investment
Serbia-specific trading coverage included volume movements tied to price rises and solar-driven peak trading patterns. Serbia: SEEPEX volumes fall in July as prices rise and solar reshapes peak trading appeared on August 5, while Trading Note 7/8: Serbia diverges from a weaker SEE market as regional reliance on imports increases was published on August 7 . HUPX liquidity rises as solar generation reshapes Hungary’s power curve was also reported that day.
The week also included corridor positioning for northbound flows from Serbia into regional markets. Serbia emerges as a key northbound electricity corridor appeared on August 8 . NIS returns to profit, but ownership uncertainty remains Serbia’s key energy challenge followed on August 6.
A low-carbon investment theme ran through Serbia coverage alongside drought-related system needs. Serbia begins the long capital cycle for nuclear power and pumped storage appeared on August 3 , while Serbia’s €43 million low-carbon facility turns energy efficiency into export strategy was reported the same date . CBAM-ready electricity supply can become Serbia’s next industrial competitive advantage appeared later that day , alongside Serbia begins the long capital cycle for nuclear power and pumped storage.
Wind projects in Romania amid scale constraints
Wind sector reporting included project entry points in Romania during this period. Romania: Scatec enters European onshore wind through €168mn project was published on August 5 . Europe’s wind industry faces a scale problem that mergers alone may not solve appeared earlier on August 4.
A separate Montenegro-focused wind risk assessment covered land access, grid requirements and financing exposure linked to Brezna development progress. Montenegro’s renewable energy fast track exposes land, grid and financing risks at Brezna was reported on August 3 .
