Glossary

Feed-in or withdrawal point

Feed-in or withdrawal points are grid connection terminals where electrical energy is either fed-in or withdrawn from the system.

Frequency stability

Frequency stability refers to the stabilisation of frequency deviations which result from imbalances between infeed and withdrawal (active power regulation) and is carried out in power stations using primary and secondary control as well as minute reserve. The electricity transmission grid in Germany and Europe has a frequency of 50 Hertz. The transmission system operators must keep this frequency as constant as possible at all times with only a small tolerance for deviation.