Great Britain record holders within the stored dataset, not all-time records. Coverage varies by source and may contain gaps.
Highest electricity demand
51.74 GW
Available dataset since February 2016 · 26 Jan 2017, 17:30
Source: Elexon BMRS · ITSDO · Coverage: Great Britain · actual · Definition demand-outturn-v1
Records calculated up to 10 Oct 2026, 01:00 UK time. Gaps may exist in the available observations.
Highest low-carbon share
100.0%
Available dataset since January 2009 · 7 Jul 2026, 11:00
Source: NESO · Historic GB Generation Mix · Coverage: Great Britain · calculated · Definition historic-generation-v1
Records calculated up to 10 Oct 2026, 00:00 UK time. Gaps may exist in the available observations.
Highest renewable share
83.1%
Available dataset since January 2009 · 5 Oct 2025, 12:00
Source: NESO · Historic GB Generation Mix · Coverage: Great Britain · calculated · Definition historic-generation-v1
Records calculated up to 10 Oct 2026, 00:00 UK time. Gaps may exist in the available observations.
Highest estimated solar generation
16.29 GW
Available dataset since January 2009 · 23 Apr 2026, 13:00
Source: NESO · Historic GB Generation Mix · Coverage: Great Britain · actual or estimated · Definition historic-generation-v1
Records calculated up to 10 Oct 2026, 00:00 UK time. Gaps may exist in the available observations.
Highest wholesale electricity price
£1983.66/MWh
Available dataset since September 2016 · 9 Sept 2021, 18:30
Source: Elexon BMRS · Market Index Data · Coverage: Great Britain · actual · Definition market-index-volume-weighted-v1
Records calculated up to 10 Oct 2026, 01:30 UK time. Gaps may exist in the available observations.
Highest wind generation
23.88 GW
Available dataset since January 2009 · 25 Mar 2026, 13:30
Source: NESO · Historic GB Generation Mix · Coverage: Great Britain · actual or estimated · Definition historic-generation-v1
Records calculated up to 10 Oct 2026, 00:00 UK time. Gaps may exist in the available observations.
Largest negative grid-frequency deviation
-0.260 Hz
Available dataset since September 2026 · 9 Oct 2026, 18:50
Source: Elexon BMRS · FREQ · Coverage: Great Britain · instantaneous · Definition frequency-v1
Records calculated up to 10 Oct 2026, 02:51 UK time. Gaps may exist in the available observations.
Largest net electricity export
7.91 GW
Available dataset since December 2015 · 22 Aug 2024, 04:30
Source: Elexon BMRS · INTOUTHH · Coverage: Great Britain · actual · Definition signed-interconnector-v1
Records calculated up to 10 Oct 2026, 01:00 UK time. Gaps may exist in the available observations.
Largest net electricity import
9.23 GW
Available dataset since December 2015 · 23 Mar 2025, 09:00
Source: Elexon BMRS · INTOUTHH · Coverage: Great Britain · actual · Definition signed-interconnector-v1
Records calculated up to 10 Oct 2026, 01:00 UK time. Gaps may exist in the available observations.
Largest positive grid-frequency deviation
0.241 Hz
Available dataset since September 2026 · 26 Sept 2026, 11:54
Source: Elexon BMRS · FREQ · Coverage: Great Britain · instantaneous · Definition frequency-v1
Records calculated up to 10 Oct 2026, 02:51 UK time. Gaps may exist in the available observations.
Lowest carbon intensity
19 gCO₂/kWh
Available dataset since January 2009 · 15 Apr 2024, 14:30
Source: NESO · Historic GB Generation Mix · Coverage: Great Britain · actual or estimated · Definition historic-generation-v1
Records calculated up to 10 Oct 2026, 00:00 UK time. Gaps may exist in the available observations.
Lowest electricity demand
15.26 GW
Available dataset since February 2016 · 24 May 2026, 13:00
Source: Elexon BMRS · ITSDO · Coverage: Great Britain · actual · Definition demand-outturn-v1
Records calculated up to 10 Oct 2026, 01:00 UK time. Gaps may exist in the available observations.
Lowest wholesale electricity price
£-99.01/MWh
Available dataset since September 2016 · 6 Sept 2025, 13:30
Source: Elexon BMRS · Market Index Data · Coverage: Great Britain · actual · Definition market-index-volume-weighted-v1
Records calculated up to 10 Oct 2026, 01:30 UK time. Gaps may exist in the available observations.
Largest negative grid-frequency deviation: -0.254 Hz
Previous -0.253 Hz · 0.40% difference · Elexon BMRS · Great Britain
Largest negative grid-frequency deviation: -0.260 Hz
Previous -0.254 Hz · 2.36% difference · Elexon BMRS · Great Britain
Largest negative grid-frequency deviation: -0.253 Hz
Previous -0.245 Hz · 3.27% difference · Elexon BMRS · Great Britain
Largest net electricity import: 8.91 GW
Previous 8.72 GW · 2.09% difference · Elexon BMRS · Great Britain
Largest positive grid-frequency deviation: 0.241 Hz
Previous 0.235 Hz · 2.55% difference · Elexon BMRS · Great Britain
Largest positive grid-frequency deviation: 0.235 Hz
Previous 0.228 Hz · 3.07% difference · Elexon BMRS · Great Britain
Largest positive grid-frequency deviation: 0.228 Hz
Previous 0.226 Hz · 0.88% difference · Elexon BMRS · Great Britain
Largest positive grid-frequency deviation: 0.226 Hz
Previous 0.225 Hz · 0.44% difference · Elexon BMRS · Great Britain
Daily, monthly, annual and full-coverage extrema are updated from normalized observations in the project database. “All-time” is not used because source coverage differs by metric.