Electricity Live

Great Britain’s electricity on Saturday 20 September 2025

On Saturday 20 September, demand averaged 26.8 GW. Renewables supplied 39%.

26.8GW AVERAGEWind9.58 GW34%Hydro0.37 GW1%Biomass2.90 GW10%Solar0.92 GW3%Gas6.78 GW24%Imports4.94 GW18%Nuclear2.51 GW9%26.8GW AVERAGE34%10%24%18%9%
Price
£68.86/MWh
Day average £68.86
Demand26.8GW
Generation 23.1Transfers 3.8
Fossil fuels24%
Renewables39%
Other37%
Carbon intensityModerate
120g/kWh
0Day average 120300
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Recorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hourRecorded half-hour

Key moments

On Saturday 20 September 2025, wind supplied 34% of Great Britain’s electricity and gas 24%. Demand peaked at 32.1 GW at 12:30. Carbon intensity averaged 120 g/kWh and the price £68.86/MWh. Wind generation peaked at 18.1 GW at 21:50. Solar generation peaked at 4.4 GW at 12:30. Carbon intensity was lowest at 23:00 (72 g/kWh) and highest at 08:00 (172 g/kWh). The wholesale price ranged from £6.28/MWh at 21:30 to £104.29/MWh at 10:00. Wind made 42% of the electricity generated in Great Britain, compared with 35% across 2025.

Charts

Generation, demand, price and carbon

Generation by sourceGW · daily average below
Solar 0.923.3%Wind 9.5834.2%Gas 6.7824.2%Hydro 0.371.3%Biomass 2.9010.3%Nuclear 2.519.0%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 26.8avgGeneration 23.1avgTransfers 3.8avg
The day in figurespeaks, averages, totals
Peak demand32.1GW · 12:30
Low 21.1 · 04:15Avg 26.80–40 GW
Made in Great Britain86%of demand
Generation 23.1Transfers 3.8 GW
Net imports87GWh
In
114 Out
27
Zero-carbon share58%of generation
Nuclear 11%Hydro 2%Wind 42%Solar 4%

Transfers · Sat 20 Sept

Interconnectors and storage

On Saturday 20 September 2025, Great Britain imported 114 GWh and exported 27 GWh through its interconnectors. The most came from France (52 GWh), and the most exports went to Ireland (19 GWh).

All interconnectors

Sat 20 Sept
Imported
114GWh
Exported
27GWh
Net in
87GWh
Average net flow
3.63GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.54GWImporting

In 13.9 GWhOut 0.9 GWh

Denmark

Viking Link

Average0.39GWImporting

In 16.1 GWhOut 6.7 GWh

France

IFA · IFA2 · ElecLink

Average2.16GWImporting

In 52.4 GWhOut 0.4 GWh

Ireland

Moyle · East–West · Greenlink

Average0.79GWExporting

In 0.0 GWhOut 18.9 GWh

Netherlands

BritNed

Average0.00GWIdle

In 0.0 GWhOut 0.0 GWh

Norway

North Sea Link

Average1.31GWImporting

In 31.4 GWhOut 0.0 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.15GWGenerating

Generated 4.7 GWhPumped 1.0 GWh

All cards share one scale, so you can compare their heights. Each country can have more than one cable.

Download the 5-minute data for this day: CSV · JSON. See what the figures mean.