What is it?
With the change of mix of energy generation, the national grid operator need to continue ensuring a good balance of electricity transmission at any given time. In other words, ensuring that the energy flow remains constant.
One of the solution is the Enhance Frequency Response: The aim of this service is to maintain the system frequency closer to 50 Hz under normal operation.
Speed of response is a key element of EFR. The assets must be able to deliver at 100% EFR capacity for a minimum of 15 minutes under normal operating conditions. For storage assets, this equates to a minimum power to energy ratio of 2C.