Wind is becoming one of the fastest-moving drivers of SEE residual load. Week 25 showed the importance of that signal. Solar generation rose strongly, but regional wind output declined 4.4%, and the system still needed a much larger thermal response. This is the basic residual-load problem: solar can help the daytime market, but weak wind leaves the system exposed in other hours.
A dedicated wind-volatility forecast would track how changes in wind generation alter the call on hydro, gas, coal and imports. In summer, wind weakness can be particularly powerful because cooling demand remains high while hydro may be seasonally constrained. The market becomes more dependent on dispatchable assets during the exact hours when solar output is fading.
Italy was the clearest example in Week 25. Wind generation fell 42.5%, forcing a sharp increase in thermal production and supporting the country’s premium price of €127.69/MWh. Hungary and Croatia also felt the impact of weaker renewable conditions, with both markets posting strong price increases.
Greece showed the opposite potential. Wind increased 37.5%, and together with higher solar helped push Greek prices down 6.6% to €85.50/MWh. This contrast proves that wind volatility is not just a generation statistic. It can flip a market from scarcity to moderation within a single week.
The forecast should focus on residual load after wind and solar, rather than renewable output alone. A high-renewable week with strong midday solar but weak evening wind can still be bullish. A lower-solar week with strong wind during peak hours can be bearish.
For traders, wind volatility creates price-spread opportunities. For system planners, it highlights the value of flexible reserves. For developers, it strengthens the case for mixed portfolios rather than single-technology exposure.
