Electricity.Trade’s May 2026 trading review shows Bulgaria moving into a stronger regional export role, supported by a generation mix that combined nuclear baseload, rising renewables and improved hydro output. Bulgaria’s monthly average spot price increased to €101.07/MWh, up 11.08% from April and 18.40% year on year. While the price rise placed Bulgaria above Serbia and Greece, the country still remained competitive enough to support export flows into neighbouring systems.
Bulgaria recorded net electricity exports of 258.65 GWh in May. It exported electricity to Romania and Serbia while receiving from North Macedonia, Türkiye and Greece. This flow pattern shows Bulgaria acting as both a recipient of lower-priced regional electricity and a supplier into markets where domestic balance was tighter. The Bulgarian market therefore functioned as a trading bridge between Greece and Türkiye on one side, and Romania and Serbia on the other.
The generation structure was the core driver. Bulgaria’s electricity mix consisted of 32.59% nuclear, 29.35% renewables, 17.58% hydro, 15.51% coal/lignite and 4.97% gas. Renewable output rose by 34.19%, the strongest month-on-month increase among the analysed SEE markets. Hydro output increased by 7.30%, while coal/lignite generation fell by 17.81% and gas-fired generation declined by 28.10%. This is a material trading signal: Bulgaria exported even as thermal generation declined, showing that nuclear, RES and hydro were sufficient to support the system’s regional position.
IBEX liquidity also strengthened. Monthly traded volume reached 2,675.87 GWh, up 3.51% from April and 15.99%year on year. That makes Bulgaria increasingly relevant as both a physical flow market and an exchange-based price reference. When liquidity rises alongside export activity, the market becomes more useful for traders managing Balkan exposures.
The May Bulgarian story is not only about cheaper generation. It is about portfolio balance. Nuclear provides stable baseload, renewables create low-marginal-cost daytime supply, hydro adds flexibility and reduced gas output lowers exposure to fuel-price volatility. For Electricity.Trade, Bulgaria should be presented as one of the region’s most strategically placed markets: connected enough to absorb and redirect flows, diversified enough to reduce thermal dependence in favourable months, and liquid enough to matter for regional trading strategies.
