A sharp fall in wind generation emerged as one of the most important electricity-market developments across Southeast Europe in Week 34, exposing the growing sensitivity of regional prices to renewable-production patterns.
Variable renewable generation across the monitored markets fell from 3,934.85 GWh in Week 30 to 3,502.73 GWh in Week 34, a decline of 11.0%. Almost the entire deterioration came from wind. Regional wind production dropped 26.4%, from 1,554.06 GWh to 1,143.82 GWh, while solar output was comparatively stable, declining by just 0.9%.
The distinction matters because wind and solar affect the market differently. Stable solar output can keep midday electricity well supplied, but a large decline in wind removes generation across a much broader set of hours. The result is a larger residual requirement for hydro, thermal plants and imports, particularly during the evening when solar output disappears.
Greece illustrates the effect most clearly. Greek wind generation fell 48.2% compared with Week 30, even though solar output increased 4.3%. Its weekly electricity price nevertheless jumped 41.2% from Week 33 to €144.41/MWh, the strongest increase among the markets covered. Türkiye experienced another significant reduction in variable renewables, down 27.0%, with wind generation falling 36.5%.
The regional picture was not uniform. Romania’s variable renewable generation increased 37.8%, Serbia’s by 48.9% and Bulgaria’s by 21.1%. This dispersion helps explain why national price movements remained differentiated even though almost all markets moved higher.
The Week 34 figures also challenge the assumption that summer renewable risk is primarily a solar story. Solar generation was relatively resilient, yet the electricity market tightened significantly. Wind availability therefore became the more important renewable variable for the week.
For traders, generators and renewable asset owners, this reinforces the importance of hourly production forecasts rather than installed capacity alone. A region can have substantial renewable capacity and still experience high wholesale prices if the technologies available during critical hours fail to produce.
The result is a market increasingly shaped by renewable correlation. When wind production falls across several interconnected countries at the same time, imports offer less protection because neighbouring systems are experiencing the same deficit. The regional market then relies more heavily on dispatchable generation and available cross-border surplus.
Week 34 provides a clear example of that transition. The renewable system did not fail because solar production collapsed. It tightened because wind generation disappeared at precisely the moment when expensive dispatchable capacity was becoming more important.
