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.

Download the EFR market information report to find out more.