We are a separate company

On 1 April the Electricity System Operator became a legally separate company within the National Grid Group. Find out more about what this change means.

Firm frequency response (FFR)

FFR creates a route to market for providers whose services may otherwise be inaccessible. The FFR service gives us and service providers both a degree of stability against price uncertainty under the mandatory service arrangements.

We assess whether the cost of a FFR tender is likely to be less or greater than the cost of an alternative to deliver the equivalent level of frequency response service.