Finally the economical benefit of seasonal load following for the operator is estimated. The demand curve (in red on the figure) is the weekly average demand in France from Monday to Friday between 8:00 and 20:00. The corresponding residual demand is plotted in pink, while the planned outages of nuclear plants and residual nuclear capacity are plotted in blue, as dotted and solid lines (respectively). This “real” data take into account the seasonal load following of the nuclear fleet. The volatility of residual demand, as well as the maximal power imbalances (both negative and positive) seen by the electrical grid, has been significantly reduced.