Due to increasing amounts of variable renewable generation, additional flexibility in the German electricity market is necessary. Potential revenues for flexibility options like battery storage systems or demand side management can be calculated based on historic prices. However, additional flexibility in the system also affects future prices. However, additional flexibility in the system also affects future prices.
In order to approximate this effect, bid curves of the EPEX-SPOT day-ahead market are used. New flexibility options may be considered to be functional storages; this allows simulating the assumed operation by linear optimization. By adjusting the bid curves according to demand or supply by the additional flexibility option, a new time series of prices can be determined. Using this, potential revenues and operation of another flexibility option is simulated. Iteratively repeating this method yields continuously decreasing revenues for additional flexible power in the market. At about 2.5 GW the reduction is 50 %.