Hydropower generation in Southeast Europe moved lower in Week 22, with total hydro output declining 10.2% from 3.98 TWh to 3.57 TWh. The reduction was heavily driven by Türkiye, where generation fell 19.2%, equivalent to 549 GWh. Outside Türkiye, hydro performance was comparatively stronger across several markets.
Italy recorded a 26.5% increase in hydro generation to 696 GWh. Croatia saw hydro rise by 75.4%, while Greece increased output by 12.1% to 97 GWh. As reported by Electricity.trade, the week highlighted how hydro divergence can influence power spreads across the region .
Hydro’s role in balancing and dispatch outcomes
Hydropower provides controllability that solar and wind do not always deliver. Depending on water conditions and system operation, reservoir and run-of-river output can soften peak prices, reduce thermal dispatch, and support exports. In a market environment where gas prices remain elevated and coal fleets face operational and environmental pressure, hydro availability can still affect market outcomes.
Greece reflected this balancing effect during the week. Higher hydro output, stronger renewables, and LNG-backed flexibility helped keep prices at €86.77/MWh. At the same time, exports increased by 35.7% to 241 GWh.
Croatia also experienced a hydro rebound that coincided with pricing changes. Hydro output rose by 75.4%, helping offset higher demand and supporting a weekly price decline of 5.5% to €100.94/MWh. In Italy, hydro increased to 696 GWh, but prices still rose as wind weakness and higher demand led to more gas-fired generation.
Divergence effects across Greece, Croatia, and Italy
The week showed different interactions between hydro and other parts of the generation stack. In Italy, hydro improved while wind fell, demand rose, and gas-fired output increased. In Greece, hydro worked alongside renewables and exports, while in Croatia it helped soften pricing despite higher consumption.
The impact of hydro therefore depends on country-specific conditions including the wider generation mix and trading position. For traders, hydrology can translate into seasonal and weekly spread opportunities tied to export or import patterns. A wetter period in Croatia or Greece can support exports or reduce imports.
A weaker Turkish hydro position can also reshape regional balances, though interconnection limits can partially contain those effects. A hydro-rich Italy can still clear at high levels if gas remains marginal . These differences mean hydrology functions as a market input rather than only a generation statistic.
Implications for storage, flexibility, and merchant risk
The hydro signal is also relevant for storage needs and hybrid project planning. Where hydro conditions are volatile, markets may require more batteries and flexible assets during dry periods. Conversely, weeks with stronger hydro can compress spreads.
Lenders evaluating merchant exposure in Southeast Europe are therefore expected to treat hydro as a variable that can materially change capture prices and dispatch risk . Week 22 reinforced that hydropower remains one of the region’s key balancing assets.
The headline fall of 10.2% concealed a more detailed picture across countries. Hydro strength in Greece, Croatia, and Italy affected local price outcomes, while Türkiye’s decline distorted the regional aggregate .
