Hydropower played a decisive role in balancing Southeast Europe’s electricity systems in February 2026, acting as the primary flexibility asset in a month marked by divergent renewable output and declining demand. Unlike solar and wind, which are inherently variable, hydro demonstrated its ability to respond dynamically to changing system conditions, reinforcing its position as a cornerstone of regional energy stability.
The most striking development was the scale of hydropower growth in several markets. Türkiye recorded an exceptional +106.61% increase, reflecting strong inflows and reservoir utilization . Greece followed with a substantial +69.07% increase, while Bulgaria (+26.56%) and Italy (+17.88%) also posted significant gains. These figures point to favorable hydrological conditions across much of the region, providing a critical buffer against variability in solar and wind generation.
In Greece, hydro played a particularly important role in compensating for weaker solar output. With variable renewables declining by -12.87%, hydro output surged to 1,116.11 GWh, stabilizing the system and supporting export capacity . This highlights hydro’s unique ability to act as both a baseload and a peaking resource, adjusting output in response to system needs.
Croatia’s generation mix further illustrates hydro’s dominance, with 49.10% of electricity coming from hydropower . In such systems, hydro is not merely a balancing tool—it is the primary source of generation. This provides a high degree of flexibility, enabling Croatia to maintain a net exporting position even as regional demand declined.
Serbia, while more dependent on coal, also relies heavily on hydro, which accounted for 36.00% of its generation mix . The combination of coal and hydro creates a hybrid system where hydro provides flexibility and coal ensures baseload stability. This structure allows Serbia to adapt to short-term fluctuations in renewable output without significant reliance on gas.
Hydro’s impact extends beyond generation into price formation and trading. By increasing output during periods of low renewable generation and reducing it when wind and solar are abundant, hydro helps smooth price volatility. In February, this was particularly evident in markets like Greece, where hydro output rose sharply as solar declined, preventing more extreme price spikes.
Cross-border flows also reflect hydro’s strategic role. Countries with strong hydro capacity, such as Türkiye and Greece, were able to maintain or increase exports, while others relied on imports to balance their systems. This reinforces hydro’s function as a regional stabilizer, enabling electricity to flow from surplus to deficit areas.
From a market perspective, hydro is increasingly valuable not just for its energy output but for its flexibility. As renewable penetration increases, the ability to ramp generation up or down quickly becomes critical. Hydro plants, with their rapid response times, are ideally suited to this role, making them essential for integrating higher shares of solar and wind.
However, hydro’s dependence on hydrological conditions introduces its own risks. February’s strong performance was driven by favorable precipitation, but this cannot be assumed in every year. Variability in water inflows can lead to significant fluctuations in output, affecting both generation and prices.
Looking forward, hydro is set to become even more central to Southeast Europe’s energy transition. As renewable capacity expands, the need for flexible resources will grow, and hydro will play a key role in meeting this demand. Investments in reservoir management, pumped storage, and cross-border coordination will be critical to maximizing its potential.
February 2026 underscores hydro’s dual function in the region: it is both a major source of electricity and the primary mechanism for balancing an increasingly variable energy system. Its importance will only increase as Southeast Europe moves further along the path toward renewable integration.
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