February 2026 highlighted how system operators in Southeast Europe are managing variability as renewable generation diverges from day-to-day demand patterns. In this environment, hydropower stood out as the region’s most responsive balancing resource, stepping in when solar output weakened and wind and solar conditions changed quickly. The operational effect was visible not only in generation totals, but also in how markets stabilized through price formation and trading.
Hydro as the primary balancing tool
Across the region, hydropower functioned as the core flexibility asset, providing dynamic output adjustments that solar and wind cannot replicate on their own. With demand declining during the month, hydro’s ability to ramp generation up or down helped maintain balance despite variable renewable conditions. This reinforced its role as a cornerstone of regional energy stability during a period of uneven renewable performance.
The clearest signal came from broad-based hydropower growth across multiple markets, pointing to favorable hydrological conditions. Türkiye recorded a +106.61% increase, driven by strong inflows and reservoir utilization. Greece followed with a +69.07% increase, while Bulgaria posted +26.56% and Italy rose by +17.88%, collectively indicating that water availability provided a critical buffer against solar and wind variability.
Greece: hydro offsets weaker solar output
In Greece, hydro’s operational contribution was closely tied to changes in solar generation. Variable renewables declined by -12.87%, while hydro output surged to 1,116.11 GWh, supporting system stability during the month. By compensating for weaker solar conditions, hydro also helped sustain export capacity rather than forcing tighter curtailment or more volatile balancing actions.
The pattern illustrates why hydropower can operate as both a baseload and a peaking resource depending on system needs. When solar falls, hydro can increase output; when renewables are stronger, it can reduce generation to maintain balance. For developers and grid planners, this dual capability is relevant to how future renewable integration studies may value dispatchable flexibility.
Generation mix signals flexibility depth
Croatia’s generation profile further underscores hydro’s dominance in certain power systems. Hydropower accounted for 49.10% of electricity coming from hydropower, meaning it is not only used for balancing but represents the primary source of generation in the mix. That structural reliance provides a high degree of flexibility, enabling Croatia to maintain a net exporting position even as regional demand declined.
Serbia presents a different but complementary configuration, with coal still playing a major role while hydro remains significant for flexibility services. Hydropower accounted for 36.00% of Serbia’s generation mix, creating a hybrid arrangement where coal supports baseload stability and hydro supplies ramping capability. This combination reduces pressure to rely on gas for short-term adjustments when renewable output fluctuates.
Market effects: smoothing volatility and supporting trades
Hydropower’s influence extends beyond physical balancing into how prices form and how trading positions are managed across the month. By increasing output during periods of low renewable generation and reducing it when wind and solar are abundant, hydro can help smooth price volatility rather than amplifying swings. In February, this mechanism was particularly evident in Greece as hydro output rose sharply when solar declined, limiting the likelihood of more extreme price spikes.
Cross-border flows also reflected hydro’s stabilizing function across the region. Countries with strong hydropower capacity, including Türkiye and Greece, were able to maintain or increase exports during the month’s changing conditions. Other markets relied on imports to cover gaps, reinforcing the role of regional transmission coordination in moving electricity from surplus areas to deficit areas.
Operational risk and planning implications
While February’s performance benefited from favorable precipitation, hydropower remains exposed to hydrological variability that cannot be assumed year-round. Variability in water inflows can translate into significant fluctuations in output, affecting both generation availability and market prices when flexibility is most needed. For utilities and operators planning dispatch strategies, this introduces an additional uncertainty layer that must be reflected in operational forecasting and risk management.
For investment planning related to renewable integration—especially where wind and solar growth increases ramping requirements—hydro’s role is likely to remain central as flexible capacity needs rise. The next phase of readiness will depend on reservoir management improvements, pumped storage development where applicable, and cross-border coordination that aligns dispatch across interconnected systems. Overall, February 2026 demonstrates that balancing resources are not only about adding new generation; they also depend on how existing flexible assets perform under changing weather-driven supply conditions across Southeast Europe.