Variable renewable energy (VRE) generation increased across Southeast Europe during Week 26 (22–28 June 2026), but the regional improvement masked significant differences between individual markets. Total VRE output climbed 11.7% week on week to 4.27 TWh, driven almost entirely by a strong recovery in wind generation, which increased 32.4%, adding 457 GWh to the regional supply mix. Meanwhile, solar generation remained largely unchanged, declining slightly by 0.4%. Although renewable production improved overall, the gains were unevenly distributed and did not always appear in the markets experiencing the strongest price pressure.
Türkiye was the largest contributor to the regional renewable increase, benefiting from a significant rise in wind production. The country’s wind generation increased by 43.8%, pushing total variable renewable output up 36.9% compared with the previous week. Greece also recorded a strong wind recovery, with wind generation rising 57.5%, more than compensating for a 5.6% decline in solar output. In contrast, Hungary and Bulgaria gained more support from higher solar production, while Romania’s renewable generation remained broadly stable during the week.
However, renewable improvements were not visible across all key markets. Croatia recorded a 25.4% decline in variable renewable generation, primarily due to weaker wind conditions. Italy also experienced lower renewable output, with wind generation falling 10.1% and solar generation declining 5.2%. These developments were particularly important because both countries were among the region’s most expensive electricity markets during the week, with Croatia averaging €139.09/MWh and Italy reaching €144.67/MWh. The data showed that strong renewable performance at regional level does not necessarily prevent local market tightness when generation falls in high-demand areas.
This highlights one of the defining challenges of renewable integration in Southeast Europe: regional averages can hide local scarcity risks. Strong wind conditions in Türkiye and Greece do not automatically benefit markets such as Croatia or Italy, where weaker renewable output can increase reliance on thermal generation and imports. For traders, utilities and large consumers, country-specific and hourly renewable forecasts are becoming increasingly important, as market conditions are increasingly determined by where and when renewable electricity is available.
The changing balance between wind and solar generation is also becoming a key factor in market performance. Solar generation provides valuable support during daytime hours but has limited impact on the evening demand peak, when electricity consumption remains high after solar output declines. Wind generation can provide greater value during evening and overnight periods, but its variability creates additional balancing challenges, particularly for smaller and less interconnected systems. Croatia’s Week 26 performance demonstrated how weaker wind availability can contribute to tighter market conditions even when other renewable resources improve.
For renewable energy developers, the latest data reinforce the importance of moving beyond installed capacity as the main measure of project value. Market returns increasingly depend on generation timing, location, grid constraints, balancing requirements and correlation with periods of electricity scarcity. A wind project capable of producing during high-demand evening hours may capture significantly greater market value than a solar project concentrated in lower-priced midday periods. Meanwhile, hybrid renewable projects combined with battery storage can provide greater flexibility and improve revenue potential.
Week 26 demonstrated that renewables are already playing a major role in Southeast European electricity markets, but their impact is becoming more complex. The key challenge is no longer only adding renewable capacity—it is ensuring that renewable generation is available at the right time and in the right locations to reduce system stress and replace conventional flexibility.
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