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Special measures are used in the event of very large balance sheet deviations. In addition to additional measures and emergency aid for foreign countries, these also include sheddable loads.
The use of an ancillary service product consisting of sheddable loads in real-time serves to directly stabilize the system frequency and is activated in the event of a below threshold frequency of 49.7 Hz. Sheddable loads can be activated either automatically by a frequency relay or manually by a decision of the transmission system operator. Further information can be found at regelleistung.net.
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In special situations, e.g. very large balance deviations, the transmission system operators (TSOs) use so-called additional measures (e.g. emergency reserve contracts with foreign countries to support the German TSOs or exchange transactions) to reduce long-lasting balance deviations. For 50Hertz and Amprion, the emergency aid provided for foreign countries is no longer included in the relevant additional measures, but is now also shown separately under the item “relevant emergency aid for foreign countries”, equivalent to the associated quality-assured data point. For TenneT and TransnetBW, this is still included in the additional operational measures until the changeover.
In addition to the supplementary measures, the emergency aid provided to foreign TSOs is recorded below.
The emergency aid for foreign countries can be the delivery of energy to foreign countries or the purchase of energy from foreign countries and can be provided, for example, by mFRR. From a German perspective, these emergency aid measures are handled in a balance sheet and financially neutral manner. The energy quantities shown therefore compensate for any balancing power activated for emergency aid in the balances of the DCs.