We are becoming a separate company

In April 2019, the Electricity System Operator is becoming a separate company within the National Grid Group. Find out more about what this change will mean.

​Enhanced frequency response (EFR)

​Enhanced frequency response (EFR) is a dynamic service where the active power changes proportionally in response to changes in system frequency. This service is aimed at improving the management of system frequency pre-fault to maintain system frequency closer to 50Hz.

For each half hour of the tender, the total cost was calculated along with the alternative response costs that the tender would offset. The benefits of each tender were expressed as a percentage of the tender cost and units were ranked by percentage benefit and selected up to the requirement.

Parties who have not pre-qualified will not be accepted into this tender round.

We anticipate that there will be future opportunities for the procurement of enhanced frequency response. We encourage potential providers to provide us with their contact details.

It is expected that the requirement for faster acting frequency response will be incorporated into the standard frequency response market through the flexibility programme.