FFR (Frequency Fast Reserve) is a support service used to quickly manage frequency deviations in the grid faster than FCR-D. It aims to stabilize the frequency when there is an imbalance between electricity production and consumption. The FFR is designed to act as a fast reacting power source such as a battery storage and is available to adjust the frequency within 0.7-1.3 seconds after a deviation has occurred.
To explain how FFR works, let’s take an example: If there is a sudden increase in electricity consumption or a decrease in electricity production in the grid, the frequency will drop. To restore the frequency to the normal range quickly, a fast-acting power source is needed.