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Datasets (3)
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System
This page holds the historic system frequency data for Great Britain at a 1 second resolution. It is the role of the National Grid ESO to keep the system frequency at 50 Hz, with a statutory limit of…
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- XLSM
Ancillary services
The Firm Frequency Response (FFR) post tender reports are published following each monthly tender. They indicate which tenders were accepted and rejected and the information submitted for these…
- CSV
Trading
Super Stable Export Limit (SEL) is utilised to directly decrease the sum of the minimum MW level or SEL of generators synchronized to the system by lowering the minimum generating level at a…