One second or less. This is the response time required from providers of the new Enhanced Frequency Response (EFR) service. National Grid aims for EFR to improve on the existing 10 second response time (Primary and High response) and 30 second response time (Secondary response) for Firm Frequency Response (FFR). EFR will help to address the security of supply challenges faced by National Grid in a rapidly changing electricity system.
Changes in the system frequency are caused by variations between supply and demand. Historically, inertia (which resists movement of frequency) has been provided mainly by synchronous thermal plants “ the big spinning masses within these generators would oppose changes in frequency. However, as these plants are slowly being replaced by asynchronous technologies (renewable generators like wind and interconnectors), there could be a fall in inertia and therefore more changes in frequency.
Battery storage potentially has a huge role to play in providing National Grid with EFR. Batteries can change their power import and export levels very quickly, and can respond to both over-frequency and under-frequency events.
A tender process is being undertaken by National Grid for up to 200MW of capacity, with a tender event due to take place for pre-qualified parties in the summer. The following milestone dates have been identified for implementation of EFR.
Tender Window Opens – 11th July 2016
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Tender Window Closes – 15th July 2016
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Publication of Results – 26th August 2016
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Post Tender Milestone Test – 28th February 2017
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Latest Service Start Date – 1st March 2018
As a specialist energy consultancy,TNEI has developed a robust understanding of EFR and is working with clients (pre-qualified confidential parties) to facilitate the delivery of the service to the grid by providing innovative solutions and expert technical advice. We are providing site finding, feasibility, engineering and consenting support utilising our extensive experience in delivering energy related developments throughout the UK.
For example, TNEI has assisted one client in developing a ~ 10MW battery storage project in southern England using containerised batteries to provide ancillary services. TNEI developed the project layout and is advising on technical, commercial and contractual requirements for deployment of a battery project.
If you would like any further information about how TNEI can support developers or suppliers in the delivery of EFR please contact info@tneigroup.com.
