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.
EFR is open to both Balancing Mechanism (BM) and non-BM providers who could meet the technical requirements
This service was developed to improve management of the system frequency before a fault occurs, maintaining system frequency closer to 50Hz under normal operation.
System frequency is a continuously changing variable that is determined and controlled by the second-by-second balance between demand and generation.
We must maintain system frequency within one per cent of 50 Hz at all times, except in abnormal or exceptional circumstances.