mFRR is activated when the deviation in the control area lasts for longer than 15 minutes. mFRR is used to relieve aFRR so that it is once again free to support or restore the availability of FCR should this be necessary. mFRR can be activated automatically or manually. In Austria, mFRR is activated manually.
In order to stabilize the grid frequency using mFRR, it must be possible to activate the control reserve in both directions (increased/reduced generation). A certain power range is reserved for this possible activation of mFRR.
A supplier who cannot meet the obligation to provide mFRR due to technical problems must inform Austrian Power Grid AG immediately by telephone and also by e-mail.
In case of non-performance, the catalogue of measures applies. (see framework documents mFRR)
If the failure can be attributed to gross negligence or intent, Austrian Power Grid AG can obligate the supplier to pay a contractual penalty and compensation.
In the event that the contractual obligations are breached repeatedly, Austrian Power Grid AG has the right to terminate the framework agreement with the supplier.
Generation units that provide mFRR can also carry out numerous scheduled and reserve deliveries. It must, however, be ensured that the agreed range for mFRR is verifiably available at all times, i.e. starting from the current operating point, a power increase or a power reduction within the agreed range and quality must be possible at all times.
For monitoring purposes, the supplier must provide Austrian Power Grid AG with time-stamped measured values for the individual generation pools via online transmission.
The supplier must also record these values to ensure that he is able to subsequently provide Austrian Power Grid AG with values that may have not been transmitted.
More detailed specifications can be found in the Prequalification Documentation for mFRR (German only).
There is an energy price for mFRR. The energy prices are used to create the Merit Order List, which is subsequently used in the call-up procedure.
At the end of the bidding period the bids are ranked according to prices – starting with the cheapest bids –, until the total volume of mFRR put out to tender is reached. Each supplier is paid the price he offered. The anonymised bidder list for the tenders is published on the tendering platform under Results.
The results of the day-ahead tenders can also be viewed in anonymised form on the tendering platform.
In the event that the number of accepted bids for mFRR does not cover the volume put out to tender, a second tender will be opened on the following day to cover 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).