Hydropower once again demonstrated its strategic importance in Southeast Europe during Week 23, serving as the region’s primary built-in flexibility resource at a time when electricity demand increased and variable renewable output weakened. Regional hydro generation rose by 10.1% week on week to 3.97 TWh, helping to soften price pressure that would otherwise have been significantly more severe.
The strongest contribution came from Türkiye, where hydropower output increased by 15.4%, or roughly 356 GWh, reaching 2.66 TWh. Croatia recorded an even more pronounced percentage jump, with hydro generation surging by 73.6%, while Serbia increased output by 30.8% and Italy posted a more moderate rise of 7.5%. These gains were particularly important given that regional electricity demand increased by 8.2%, while variable renewable generation simultaneously declined by 8.9%.
The value of hydropower lies not only in total production, but in its dispatchability, timing, and system control capability. Unlike solar, hydro can be shifted toward peak hours. Unlike wind, it is not directly tied to short-term weather fluctuations, although it remains dependent on hydrological conditions and reservoir levels. During a week marked by weaker wind output and a pronounced evening price ramp, hydro acted as a natural price stabiliser.
The Serbian market clearly illustrates this mechanism. Day-ahead prices in Serbia fell by 5.8% week on week to €99.63/MWh, despite broader regional demand growth. Improved hydro availability, combined with higher thermal generation and slightly softer local demand, helped reduce price pressure. In such environments, hydro flexibility can outweigh wider bullish regional fundamentals.
Croatia also benefited from a strong hydro recovery, although its price response was more muted. In hydro-based systems, the key commercial factor is not simply water availability, but when that water is released. Reservoir value increases significantly during periods of high evening prices, expensive imports, and tight marginal generation conditions dominated by gas or lignite units.
This dynamic strengthens the long-term case for pumped storage and advanced hydro optimisation. While Southeast Europe already relies heavily on large hydro fleets, the next phase of system transformation will require more sophisticated reservoir management, integration with solar and wind forecasting, and increased investment in storage capabilities. Hydropower effectively functions as a regional balancing battery, but only if it is operated with flexibility and market price signals in mind.
For investors, hydro-linked flexibility is increasingly becoming a premium asset class. Generators capable of shifting production into high-price periods, providing reserve services, and supporting renewable integration are gaining strategic value. This also implies a growing divergence in valuations between inflexible baseload assets and hydro portfolios with strong dispatch optimisation potential.
Week 23 reinforced a key structural reality: Southeast Europe does not lack flexibility resources—it already possesses them in the form of hydropower. The central challenge now is ensuring that this flexibility is fully optimised, properly valued, and increasingly integrated into a renewable-driven power system.
