Historic frequency data

This page holds historic frequency data for Great Britain at a 1 second resolution. N.B. 2019 data was updated on 14/2/2020 to correct for errors.

Data for 2020 onwards will be published on the National Grid ESO Data Portal: https://data.nationalgrideso.com/system/system-frequency-data.

Name
January 2019 - Historic Frequency Data
February 2019 - Historic Frequency Data
March 2019 - Historic Frequency Data
April 2019 - Historic Frequency Data
May 2019- Historic Frequency Data
June 2019- Historic Frequency Data
July 2019- Historic Frequency Data
August 2019- Historic Frequency Data
September 2019- Historic Frequency Data
October 2019- Historic Frequency Data
November 2019 - Historic Frequency Data
December 2019- Historic frequency Data

Second-by-second frequency data for the calendar year 2018.

Published	Name
21 June 2018	January 2018 - Historic Frequency Data
21 June 2018	February 2018 - Historic Frequency Data
21 June 2018	March 2018 - Historic Frequency Data
21 June 2018	April 2018 - Historic Frequency Data
17 September 2018	May 2018 - Historic Frequency Data
17 September 2018	June 2018 - Historic Frequency Data
	July 2018 - Historic Frequency Data
15 March 2019	August 2018 - Historic Frequency Data
15 March 2019	September 2018 - Historic Frequency Data
15 March 2019	October 2018 - Historic Frequency Data
15 March 2019	November 2018 - Historic Frequency Data
15 March 2019	December 2018 - Historic Frequency Data

Second-by-second frequency data for the calendar year 2017.

Name
January 2017 - Historic Frequency Data
February 2017 - Historic Frequency Data
March 2017 - Historic Frequency Data
April 2017 - Historic Frequency Data
May 2017 - Historic Frequency Data
June 2017 - Historic Frequency Data
July 2017 - Historic Frequency Data
August 2017 - Historic Frequency Data
September 2017 - Historic Frequency Data
October 2017 - Historic Frequency Data
November 2017 - Historic Frequency Data
December 2017 - Historic Frequency Data

Second-by-second frequency data for the calendar year 2016.

Name
January 2016 - Historic frequency data
February 2016 - Historic frequency data
March 2016 - Historic frequency data
April 2016 - Historic frequency data
May 2016 - Historic frequency data
June 2016 - Historic frequency data
July 2016 - Historic frequency data
August 2016 - Historic frequency data
September 2016 - Historic frequency data
October 2016 - Historic frequency data
November 2016 - Historic frequency data
December 2016 - Historic frequency data

Second-by-second frequency data for the calendar year 2015.

Name
January 2015 - Historic Frequency Data
February 2015 - Historic Frequency Data
March 2015 - Historic Frequency Data
April 2015 - Historic Frequency Data
May 2015 - Historic Frequency Data
June 2015 - Historic Frequency Data
July 2015 - Historic Frequency Data
August 2015 - Historic Frequency Data
September 2015 - Historic Frequency Data
October 2015 - Historic Frequency Data
November 2015 - Historic Frequency Data
December 2015 - Historic Frequency Data

Second-by-second frequency data for the calendar year 2014.

Name
January 2014 - Historic Frequency Data
February 2014 - Historic Frequency Data
March 2014 - Historic Frequency Data
April 2014 - Historic Frequency Data
May 2014 - Historic Frequency Data
June 2014 - Historic Frequency Data
July 2014 - Historic Frequency Data
August 2014 - Historic Frequency Data
September 2014 - Historic Frequency Data
October 2014 - Historic Frequency Data
November 2014 - Historic Frequency Data
December 2014 - Historic Frequency Data