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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.

NOTE: Due to the size and format of these files, to view the data, please download the CSV file 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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