Network Reserve

Call for expressions of interest 

In accordance with the provisions of the German regulation on network reserve of power plants (Netzreserveverordnung) as last amended on December 22^nd  2023, the German national regulatory authority (Bundesnetzagentur, NRA) has confirmed the requirement for additional reserve power for the network reserve for the winter period 2026/2027 accordance with § 3 para 1 NetzResV. To cover this demand, an expression of interest procedure will be initiated by the transmission system operators in accordance with § 4 para 1 NetzResV.

The German transmission system operators hereby invite interested power plant operators to submit expressions of interest in accordance with § 4 (2) NetzResV for the participation of their power plants in the network reserve in the period from 4^th May 2026 to 19^th May 2026 12 p.m. CET. To submit an expression of interest, interested operators are required to complete the documents supplied for this purpose and send them electronically (provided with a qualified electronic signature) to the responsible transmission system operator:

• §  for Germany: the relevant connecting transmission system operator
• § for Italy and Switzerland: TransnetBW GmbH
• § for France and Luxemburg: Amprion GmbH

Details of the specific prerequisites and requirements for the plants and/or plant operators, including the geographical network region in question and the technical parameters involved, are included in the documents provided.

The deadline for submitting expressions of interest for participation in the network reserve is on May 19^th, 2026, 12 p.m. CET. The electronic submission of the signed documents is relevant for the on-time submission.

Possible resulting contracts will depend on approval by the German NRA, especially regarding the selection of plant operators to be contracted and resulting financial obligations upon the responsible transmission system operator. There is no legal entitlement to conclude a contract.

TransnetBW reserve the right to change the published information without further announcements.

Contacts for expressions of interest to be submitted to

netzreserve@transnetbw.de

Start-up tests of reserve power plants

To ensure operational readiness for necessary system security measures at any time, start-up tests of reserve power plants in Germany have to be carried out on a regular basis due to technical reasons. If possible, these tests will be integrated in necessary system security measures. Otherwise, the related energy will be brought to the intraday market. The following table provides further information on scheduled start-up tests.

In case a start-up test is cancelled, power and energy is set to zero.

Activation of reserve power outside of Germany

To ensure security of the electricity system TransnetBW GmbH will activate network reserve power from abroad during the following time periods in coordination with the other German Transmission System Operators.

This may lead to restrictions regarding the allocation of cross-border transmission capacity at the border Germany- Switzerland.

Note to table: If an upcoming activation of reserve power from outside of Germany has already been published, but has not been used (cancellation), the end date is set equal to the start time.