Firm Frequency Response

Participants in Firm frequency response can generate revenue by using energy assets to balance fluctuations in grid frequency.

This is achieved through two different methods below:
Static Firm Frequency Response (SFFR)
Dynamic Firm Frequency Response (DFFR)

Static Firm Frequency Response (SFFR)

This is the simplest and most widely used form of frequency balancing service in the UK. Participants can agree to respond to a drop in the frequency from 50Hz to 49.7Hz by reducing consumption for a period of 30 minutes. These events can be caused by power outages and tend to be irregular at between 7 – 12 times a year.
Most businesses have suitable assets which can earn revenue from Static FFR, and due to the higher level of certainty and the limited number of events, this is one of the most popular ways to enter the frequency response market.

Dynamic Firm Frequency Response (DFFR)

This is one of the most valuable balancing services on a £/MW hour basis.
Whereas Static FFR is concerned with maintaining the system frequency between the limits of 49.7 and 50.3 Hz, Dynamic FFR concentrates on managing the system frequency under normal operating conditions before a fault occurs and tracks precise grid frequency through high and low frequency periods.
Participants in Dynamic FFR are paid to both ramp up their load on the grid and consume more electricity, as well as ramping down during times of frequency imbalance, to restore the grid to 50Hz optimum operating frequency. They begin to deliver a response within 2 seconds and usually complete their response within 10 seconds, although this can last for a few minutes.

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