Common tendering of minute reserve

Since 1 December 2006, German transmission system operators (TSOs) have been meeting their minute reserve (MR) requirements through shared calls for tenders issued on the Internet platform regelleistung.net. On this platform, calls for tender are published, offers are processed, and BSPs are informed whether their offers have been accepted or rejected.

On 18/10/2011, the market design that applied until then was revised for the first time and updated again on 13/06/2017. The new market design is introduced in two stages as of 12/07/2018 and 12/07/2019.

Here is an overview of the main currently applicable framework conditions:

  • Tendering period:
  • Daily
  • Core portion:
  • Cross-control-area tendering of the full requirement; for a core portion only subject to prior approval from the FNA
  • Products:
  • Positive and negative MR, always with six 4-hour time slices
  • Minimum lot size:
  • 5 MW. A lot size of 1 MW, 2 MW, 3 MW or 4 MW is adrmissible, provided that a BSP of minute reserve submits only one offer per product time slice of the positive or negative MR in the respective control area.
  • Offer pooling:
  • Possible within a control area
  • Block offers:
  • Offers up to a maximum of 25 MW can be designated as indivisible. Subdivision by the TSO during tendering procedures or activation is not permitted, skipping during assignment is allowed if the requirement is exceeded as a result of the overhead.
  • Activation:
  • Automatic activation of MR by MOLS
  • Securing reserves:
  • To secure the availability of reserves, BSPs may fall back on pre-qualified technical units of third partie' installations in the same control area. As of 12/07/2019, the cross-control-area securing of reserves through pre-qualified technical units of the BSP or third party is also admissible if the technical failure of the installations providing minute reserve cannot be compensated within the BSP's own system pool for that control area.

A precondition for taking part in a joint tender is the conclusion of a framework contract between the BSP and connecting TSO following successful pre-qualification, whereby the prequalified MR must be at least 1 MW.

The connecting TSO is that TSO in the control area of which the technical units to be marketed by the BSP are connected to the grid, irrespective of the voltage level. This TSO conducts the pre-qualification procedure for technical units (e.g. generating units or controllable consumer loads) in its control area and is the contract party of the BSP whose technical units are located in the control area of the connecting TSO. If a BSP markets technical units in several control areas, a framework agreement has to be concluded with each respective connecting TSO.

Each BSP has its own secure area for the submission of offers and access to the allocation results on the Internet platform. The next-day tendering procedure takes place each calendar day for the subsequent working day.