sentences:  The relative rigidity of the production, which cannot be flexibly adjusted and the relative uncertainty about the actual consumption, which depends on a number of factors such as weather, industrial production levels etc., are bound to create unpredicted spikes in electricity prices.There is one major factor that had a dramatic influence on the electricity spot prices in the recent years, which is the wind.The portion of the wind energy in the overall electricity production increased significantly in the last couple of years in many European countries due to heavily subsidized governmental programs favoring investments into renewable energy sources.