SEE power markets move toward a daytime export pattern as solar output rises

South-East Europe’s power market is moving away from a consistently import-dependent posture toward a more structural daytime export pattern. The shift is being driven by rapid growth in solar generation alongside declining domestic demand, changing how electricity moves across borders and when it is needed most.

Week 16 shows the swing from imports to exports

In week 16, the region posted a net export position of +195 MW, reversing the -1,172 MW import position recorded in the prior week. That equates to an approximate 1.37 GW swing, largely linked to higher renewable output and lower consumption.

Bulgaria and Romania were the main contributors to the export growth, delivering +870 MW and +232 MW respectively, while Greece also added significantly. Serbia, by contrast, remained a net importer at -245 MW—reflecting continued reliance on thermal generation and comparatively lower renewable capacity.

Midday exports dominate; evenings bring back imports

The new export dynamic is most pronounced during midday hours, when solar generation peaks and domestic demand is at its lowest. During these periods, excess electricity increasingly flows toward Central Europe and Italy, reversing traditional import patterns.

But the model is highly time-dependent. As solar output declines in the evening, South-East Europe reverts to a net import position to meet demand using external sources. The result is a dual system: exports dominate during daylight hours, while imports return overnight.

Implications for prices, trading and system operations

This day-versus-night structure raises challenges and opportunities for market participants. Generators face a more volatile price environment as supply surges around midday. Traders can potentially benefit from arbitraging between markets and time periods created by shifting balances throughout the day.

System operators also confront increasing operational complexity as cross-border flows become more variable between daytime surplus conditions and evening deficit periods—raising the stakes for maintaining stability while managing those swings.

What comes next as renewables keep expanding

The trend is likely to strengthen as renewable capacity continues to expand. Without additional investment in storage and flexible generation, the gap between daytime surplus and evening deficit is expected to widen, further entrenching South-East Europe’s role as a net exporter during solar hours.

Overall, this structural evolution signals a fundamental change in how SEE power markets function—transforming them into more dynamic participants in the broader European energy landscape rather than systems defined primarily by imports.