​Mandatory response services

Mandatory frequency response (MFR) is an automatic change in active power output in response to a frequency change. The service helps us to keep frequency within statutory and operational limits.


When a generating unit is built or modified, we must test its capability to provide MFR.

Mandatory Service Agreement (MSA)

Once the generator has successfully met the minimum requirements, a Mandatory Service Agreement (MSA) can be put in place, or amended if a unit has been modified.

The MSA allows us to instruct the service as required.