The Manual Frequency Restoration Reserve (mFRR), also known as R3, is an essential part of the strategy of grid operators such as Elia and TenneT.

 Unlike other balancing services such as the Frequency Containment Reserve (FCR) and the automatic Frequency Restoration Reserve (aFRR), mFRR is manually activated by the grid operators and the requested energy must be available within 15 minutes. This must then remain activated for a few hours to support the grid frequency. this emergency power can be adjusted up or down to increase or decrease the grid frequency respectively. The power is subsequently checked by reading the grid meters (often on a 5-minute basis).

This service is offered by Balancing Service providers(BSPs) which are either directly connected to the grid or aggregate capacity. these BSPs have the option to reserve their balancing capacity in advance or use their capacity freely during the day to provide flexibility to the grid operator.

Eniris offers various integrations with various BSPs, such as Edmij, Flexcity, and Dexter. A maximum injection setpoint in supplied from the BSPs

Activation Duration:

• R3 Standard: unlimited within a contracted 4-hour block
• R3 Flex: unlimited within contracted 4-hour block with 8 hours recovery time between activations.

An activation of emergency power hardly occurs. For example, Tennet activated emergency power 35 times in 2017, with the duration of these requests usually between 15 minutes and 1.5 hours.

• aFRR: aFRR requests power delivery within 30 seconds for initial power and within 5 minutes for full activation. You must be able to provide the requested power in blocks of 24 hours.
• mFRR: With mFRR, your asset is expected to deliver full power within 15 minutes. The requested power must then be available for blocks of 24 hours.