This page contains the most important information for potential suppliers of manual frequency restoration reserve (mFRR). More precise and legally binding information can be found in the contract documentation in the Download column.
When do the tenders take place?
The bidding period for the weekly market maker tender is normally on Thursdays from 9:00 to 13:00. Suppliers who have been accepted can adjust their energy prices up to the end of the day-ahead tender (as described under Minimum and Maximum Bid).
The daily market maker tender is on every working day (except Saturdays) from 08:00 to 10:30.
On weekdays (except Saturdays) the market participants have the possibility from 11:00 to 13:00 to adjust the energy prices for the accepted bids from the daily or weekly power control tenders.
The suppliers will be informed in due time should it be necessary to postpone or change the bidding period in exceptional circumstances.
A tender for mFRR with power price is carried out for the coming weekend (Saturday and Sunday) as well as – separately – for the following week from Monday to Friday. These two tendering periods embrace six different product time slots, each of which can be bid for individually:
(each pos. and neg. TRR)
00-04 WE-WA (each pos. and neg. TRR)
(each pos. and neg. TRR)
(each pos. and neg. TRR)
12-16 WE-WA (each pos. and neg. TRR)
16-20 WE-WA (each pos. and neg. TRR)
20-24 WE-WA (each pos. and neg. TRR)
In addition, there is a short-term tender in which no power price is paid for the reserved mFRR ("day-ahead tender"). In this tender, different energy prices can be bid for the six product time slots on each individual day (i.e. six products per day). These products are identical to the products in the market maker tender, i.e. the bids are ranked in a list which forms the basis for a potential subsequent call.
Pre-qualified suppliers of mFRR can, of course, participate in both tenders, i.e. a supplier who has been accepted in the market maker tender is free to submit further bids (also for the same delivery period) in the day-ahead tender. They can also change the energy price which has already been accepted in the market maker tender (see "Minimum and Maximum Bid" below).
Volume put out to tender
The continuous demand for mFRR in the APG control area is normally:
Total: +280 MW Weekly: 200 MW / Daily: 80 MW (power increase, i.e. supplier delivers to grid)
Total: -195 MW Weekly: -125 MW / Daily: -70 MW (power decrease, i.e. supplier takes energy from grid)
In exceptional circumstances, the required volume of mFRR can be changed by the control area manager.
Minimum and maximum bid
Power Price Unit
Energy Price Unit
Min. First Volume (for the first bid)
Max. Bid Volume*
Min. Volume Step**
Min. Bid Price
Max. Bid Price
No max. price
Min. Energy Price
No min. price (pos. und neg. prices
Max. Energy Price
*the bid volume must not exceed the amount of the prequalified volume
**only full MW can be bid
The tender takes place exclusively via the electronic tendering platform.
In the market maker tender, the bids with the lowest power price are accepted. If the prices of two bids are identical, preference is given to the bid that has the lower energy price. And lastly the time the bid was placed.
Suppliers whose bids are successful will receive the power price they quoted, i.e. a "pay as bid" approach is adopted. Once the bid has been accepted, the suppliers are obliged to reserve the corresponding volume of mFRR.
mFRR is only provided when called by APG. It must then be provided for a minimum of 15 minutes. This minimum period does not, however, apply up to the end of the product time slot, as, in this case, the call and the product time slot end at the same time (compare item 3(7) of the Framework Agreement - in German).
All callable bids for the provision of mFRR are ranked according to energy price and entered in the merit order list. In the event that it is necessary to increase or reduce the generation capacity in the APG control area, the next offer in the list will be called. In the case of positive mFRR (supplier delivers to the grid), the offers with the lowest energy price will be called first. In the case of negative mFRR (supplier takes energy from the grid), the offers with the highest energy price will be called first. If the energy prices are identical, preference is given to the offer with the largest volume. If the volume is also identical, the bid that was submitted first will be called.
Accepted suppliers receive the price they bid in euro per megawatt hour (when delivering energy) or pay the price they bid (when taking energy from the grid).
In the event of an unsuccessful tender, e.g. not enough bids, the valid bids will be accepted and a new tender will be opened for the shortfall.
If there is still a shortfall after the second invitation to tender, a further invitation to tender will be opened in a "last call". In this case, APG calls on the suppliers to offer available power by e-mail or if possible, by telephone.
Detailed information relating to this procedure can be found in Tendering Conditions for mFRR (German only).
See Conditions for participation in tenders for control energy.
The documents required for participation in the tenders for mFRR can be found in the Download column on the right-hand side.