Enhanced Frequency Response (EFR) is a legacy frequency response service that providers could bid for 4-year contracts up to 50MW in size. As the auction was pay-as-bid, to calculate revenues we match accepted bid prices (£/MW/h) and apply them to each site.
Table 1 (below) shows the auction details of the auction which took place on 26 August 2016 (source: National Grid).
Contract capacity (MW)
Average price £/MW/h
Estimated start date
Estimated end date
Pen Y Cymoedd
Port of Tyne
As the actual end dates of EFR contracts are unclear, we currently assign sites contracted in the service revenues until their estimated end date as outlined above. The estimated end date was estimated using the contracted service hours from the EFR tender results published by National Grid. The EFR revenues in the Leaderboard do not account for any performance penalties which may be applied if assets breach market participation guidelines for the service as we have no visibility using public data on instances where this occurs.
To learn about frequency response services, check out our Energy Academy video here.