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.
2019
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Second-by-second frequency data for the calendar year 2019.
| Name Sort descending | Published |
|---|---|
| April 2019 - Historic Frequency Data | 14 Feb 2020 |
| August 2019- Historic Frequency Data | 14 Feb 2020 |
| December 2019- Historic frequency Data | 14 Feb 2020 |
| February 2019 - Historic Frequency Data | 14 Feb 2020 |
| January 2019 - Historic Frequency Data | 14 Feb 2020 |
| July 2019- Historic Frequency Data | 14 Feb 2020 |
| June 2019- Historic Frequency Data | 14 Feb 2020 |
| March 2019 - Historic Frequency Data | 14 Feb 2020 |
| May 2019- Historic Frequency Data | 14 Feb 2020 |
| November 2019 - Historic Frequency Data | 14 Feb 2020 |
2018
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Second-by-second frequency data for the calendar year 2018.
| Name Sort descending | Published |
|---|---|
| April 2018 - Historic Frequency Data | 21 Jun 2018 |
| August 2018 - Historic Frequency Data | 15 Mar 2019 |
| December 2018 - Historic Frequency Data | 15 Mar 2019 |
| February 2018 - Historic Frequency Data | 21 Jun 2018 |
| January 2018 - Historic Frequency Data | 21 Jun 2018 |
| July 2018 - Historic Frequency Data | |
| June 2018 - Historic Frequency Data | 17 Sep 2018 |
| March 2018 - Historic Frequency Data | 21 Jun 2018 |
| May 2018 - Historic Frequency Data | 17 Sep 2018 |
| November 2018 - Historic Frequency Data | 15 Mar 2019 |
2017
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Second-by-second frequency data for the calendar year 2017.
| Name Sort descending | Published |
|---|---|
| August 2017 - Historic Frequency Data | 19 Jun 2018 |
| December 2017 - Historic Frequency Data | 19 Jun 2018 |
| February 2017 - Historic Frequency Data | 19 Jun 2018 |
| January 2017 - Historic Frequency Data | 19 Jun 2018 |
| July 2017 - Historic Frequency Data | 19 Jun 2018 |
| June 2017 - Historic Frequency Data | 19 Jun 2018 |
| March 2017 - Historic Frequency Data | 19 Jun 2018 |
| May 2017 - Historic Frequency Data | 19 Jun 2018 |
| November 2017 - Historic Frequency Data | 19 Jun 2018 |
| October 2017 - Historic Frequency Data | 19 Jun 2018 |
2016
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Second-by-second frequency data for the calendar year 2016.
| Name Sort descending | Published |
|---|---|
| April 2016 - Historic frequency data | 30 Jan 2018 |
| August 2016 - Historic frequency data | 30 Jan 2018 |
| December 2016 - Historic frequency data | 30 Jan 2018 |
| February 2016 - Historic frequency data | 30 Jan 2018 |
| January 2016 - Historic frequency data | 30 Jan 2018 |
| July 2016 - Historic frequency data | 30 Jan 2018 |
| June 2016 - Historic frequency data | 30 Jan 2018 |
| March 2016 - Historic frequency data | 30 Jan 2018 |
| May 2016 - Historic frequency data | 30 Jan 2018 |
| November 2016 - Historic frequency data | 30 Jan 2018 |
2015
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Second-by-second frequency data for the calendar year 2015.
| Name Sort descending | Published |
|---|---|
| April 2015 - Historic Frequency Data | 19 Jun 2018 |
| August 2015 - Historic Frequency Data | 19 Jun 2018 |
| December 2015 - Historic Frequency Data | 19 Jun 2018 |
| February 2015 - Historic Frequency Data | 19 Jun 2018 |
| January 2015 - Historic Frequency Data | 19 Jun 2018 |
| July 2015 - Historic Frequency Data | 19 Jun 2018 |
| June 2015 - Historic Frequency Data | 19 Jun 2018 |
| March 2015 - Historic Frequency Data | 19 Jun 2018 |
| May 2015 - Historic Frequency Data | 19 Jun 2018 |
| November 2015 - Historic Frequency Data | 19 Jun 2018 |
2014
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Second-by-second frequency data for the calendar year 2014.
| Name Sort descending | Published |
|---|---|
| April 2014 - Historic Frequency Data | 19 Jun 2018 |
| August 2014 - Historic Frequency Data | 19 Jun 2018 |
| December 2014 - Historic Frequency Data | 19 Jun 2018 |
| February 2014 - Historic Frequency Data | 19 Jun 2018 |
| January 2014 - Historic Frequency Data | 19 Jun 2018 |
| July 2014 - Historic Frequency Data | 19 Jun 2018 |
| June 2014 - Historic Frequency Data | 19 Jun 2018 |
| March 2014 - Historic Frequency Data | 19 Jun 2018 |
| May 2014 - Historic Frequency Data | 19 Jun 2018 |
| November 2014 - Historic Frequency Data | 19 Jun 2018 |
2019
Rich text
Second-by-second frequency data for the calendar year 2019.
| Name Sort descending | Published |
|---|---|
| April 2019 - Historic Frequency Data | 14 Feb 2020 |
| August 2019- Historic Frequency Data | 14 Feb 2020 |
| December 2019- Historic frequency Data | 14 Feb 2020 |
| February 2019 - Historic Frequency Data | 14 Feb 2020 |
| January 2019 - Historic Frequency Data | 14 Feb 2020 |
| July 2019- Historic Frequency Data | 14 Feb 2020 |
| June 2019- Historic Frequency Data | 14 Feb 2020 |
| March 2019 - Historic Frequency Data | 14 Feb 2020 |
| May 2019- Historic Frequency Data | 14 Feb 2020 |
| November 2019 - Historic Frequency Data | 14 Feb 2020 |
2018
Rich text
Second-by-second frequency data for the calendar year 2018.
| Name Sort descending | Published |
|---|---|
| April 2018 - Historic Frequency Data | 21 Jun 2018 |
| August 2018 - Historic Frequency Data | 15 Mar 2019 |
| December 2018 - Historic Frequency Data | 15 Mar 2019 |
| February 2018 - Historic Frequency Data | 21 Jun 2018 |
| January 2018 - Historic Frequency Data | 21 Jun 2018 |
| July 2018 - Historic Frequency Data | |
| June 2018 - Historic Frequency Data | 17 Sep 2018 |
| March 2018 - Historic Frequency Data | 21 Jun 2018 |
| May 2018 - Historic Frequency Data | 17 Sep 2018 |
| November 2018 - Historic Frequency Data | 15 Mar 2019 |
2017
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Second-by-second frequency data for the calendar year 2017.
| Name Sort descending | Published |
|---|---|
| August 2017 - Historic Frequency Data | 19 Jun 2018 |
| December 2017 - Historic Frequency Data | 19 Jun 2018 |
| February 2017 - Historic Frequency Data | 19 Jun 2018 |
| January 2017 - Historic Frequency Data | 19 Jun 2018 |
| July 2017 - Historic Frequency Data | 19 Jun 2018 |
| June 2017 - Historic Frequency Data | 19 Jun 2018 |
| March 2017 - Historic Frequency Data | 19 Jun 2018 |
| May 2017 - Historic Frequency Data | 19 Jun 2018 |
| November 2017 - Historic Frequency Data | 19 Jun 2018 |
| October 2017 - Historic Frequency Data | 19 Jun 2018 |
2016
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Second-by-second frequency data for the calendar year 2016.
| Name Sort descending | Published |
|---|---|
| April 2016 - Historic frequency data | 30 Jan 2018 |
| August 2016 - Historic frequency data | 30 Jan 2018 |
| December 2016 - Historic frequency data | 30 Jan 2018 |
| February 2016 - Historic frequency data | 30 Jan 2018 |
| January 2016 - Historic frequency data | 30 Jan 2018 |
| July 2016 - Historic frequency data | 30 Jan 2018 |
| June 2016 - Historic frequency data | 30 Jan 2018 |
| March 2016 - Historic frequency data | 30 Jan 2018 |
| May 2016 - Historic frequency data | 30 Jan 2018 |
| November 2016 - Historic frequency data | 30 Jan 2018 |
2015
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Second-by-second frequency data for the calendar year 2015.
| Name Sort descending | Published |
|---|---|
| April 2015 - Historic Frequency Data | 19 Jun 2018 |
| August 2015 - Historic Frequency Data | 19 Jun 2018 |
| December 2015 - Historic Frequency Data | 19 Jun 2018 |
| February 2015 - Historic Frequency Data | 19 Jun 2018 |
| January 2015 - Historic Frequency Data | 19 Jun 2018 |
| July 2015 - Historic Frequency Data | 19 Jun 2018 |
| June 2015 - Historic Frequency Data | 19 Jun 2018 |
| March 2015 - Historic Frequency Data | 19 Jun 2018 |
| May 2015 - Historic Frequency Data | 19 Jun 2018 |
| November 2015 - Historic Frequency Data | 19 Jun 2018 |
2014
Rich text
Second-by-second frequency data for the calendar year 2014.
| Name Sort descending | Published |
|---|---|
| April 2014 - Historic Frequency Data | 19 Jun 2018 |
| August 2014 - Historic Frequency Data | 19 Jun 2018 |
| December 2014 - Historic Frequency Data | 19 Jun 2018 |
| February 2014 - Historic Frequency Data | 19 Jun 2018 |
| January 2014 - Historic Frequency Data | 19 Jun 2018 |
| July 2014 - Historic Frequency Data | 19 Jun 2018 |
| June 2014 - Historic Frequency Data | 19 Jun 2018 |
| March 2014 - Historic Frequency Data | 19 Jun 2018 |
| May 2014 - Historic Frequency Data | 19 Jun 2018 |
| November 2014 - Historic Frequency Data | 19 Jun 2018 |