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System Frequency

System Frequency


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 0.5 Hz above or below this value. Time values are all given in Greenwich Mean Time (GMT) starting January 2020.

Please note that due to the size and format of these files they are not currently available via the API. To view the data please download the zip file, unzip it and open it with Notepad++ for complete document loading.

Additional Info

Field Value
Creator National Grid Electricity System Operator
Date Created 2019-11-05T11:50:19.675126
Rights National Grid ESO Open Data Licence
Update Frequency Monthly

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