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.

Following the publication of the FFR Outline Change proposal we are now publishing the Detailed Change Proposal.  Alongside the DCP we are publishing the Standard Contract Terms (issue #9), for ease of comparing SCTs #8 & #9 we are issuing a redline version of the document.  Relating to changes to mandatory works provisions we are publishing the Appendix in the FFR Framework Agreement that will reflect these.      

17th June 19 - The Current Testing Guidance Document can be found here.  Following on from the consultation that closed in September 2018 the NGESO reviewed the responses and has been engaging with the ADE regarding taking the testing guidance forward.  NGESO is now in a position to publish the revised Draft FFR Testing Guidance Document for consultation on the proposed changes along with the Covering Letter.  The deadline for responses on the proposed Guidance is 17:00 on the 29th June 2019 

November update to the FFR OCP. We are in position to proceed with implementing changes from the OCP, however before this next phase, we are concluding some analysis of the impact of EBGL to the proposed changes. We aim to provide an update by 30th November.
Update to the Outline Change Proposal (OCP) for Firm Frequency Response (FFR): Following the update on the 9th August, National Grid has now completed the review of the extensive number of responses and comments received. We can now confirm our intention to proceed to the implementation phase.  We expect to be in a position to publish full details of our conclusions in early October 2018.
We have published the Outline Change Proposal (OCP) for Firm Frequency Response (FFR).  This is an opportunity for the industry to feedback on the proposed changes to the service.  Part of this OCP is the simplification of the Standard Contract Terms (SCT) as stated in the product road map for frequency response and reserve. Please use this link for the draft version of the simplified SCTs included in this OCP.

We have published our findings and guidance on State of Charge Management along with the supporting analysis behind our findings

FFR can provide both dynamic and non-dynamic response to changes in frequency:

Dynamic frequency response is a continuously provided service used to manage the normal second-by-second changes on the system.

Non-dynamic frequency response is typically a discrete service triggered at a defined frequency deviation.

Response speeds

There are three response speeds for frequency response.

Providers may offer only one of these or a combination of different response times.

Primary response - Response provided within 10 seconds of an event, which can be sustained for a further 20 seconds.

Secondary response - Response provided within 30 seconds of an event, which can be sustained for a further 30 minutes.

High frequency response - Response provided within 10 seconds of an event, which can be sustained indefinitely.

Providing FFR

The FFR service is open to both Balancing Mechanism (BM) and non-BM providers who can meet the technical requirements. This might include generators connected to the transmission and distribution networks, storage providers and aggregated demand side response.

Providers can offer other balancing services outside of their tendered FFR windows.

Units must be ready and in frequency sensitive mode at the start of each FFR window.