Fig. 5From: Contributions of flexible power generation from biomass to a secure and cost-effective electricity supply—a review of potentials, incentives and obstacles in GermanyVariance and average of hourly EPEX Spot SE day-ahead prices for the period 2005–2015 (source: own calculations based on [124]). Note: the variance depicts the sum of the squared deviation of hourly values of EPEX Spot SE prices in a year from the mean EPEX Spot SE price in that yearBack to article page