Electricity Live

Great Britain’s electricity on Tuesday 23 September 2025

On Tuesday 23 September, demand averaged 29.6 GW. Renewables supplied 26%.

29.6GW AVERAGEWind4.62 GW15%Hydro0.50 GW2%Biomass3.27 GW10%Solar2.85 GW9%Gas11.90 GW38%Imports5.58 GW18%Nuclear2.51 GW8%29.6GW AVERAGE15%10%9%38%18%8%
Price
£91.71/MWh
Day average £91.71
Demand29.6GW
Generation 25.6Transfers 3.9
Fossil fuels38%
Renewables26%
Other36%
Carbon intensityModerate
181g/kWh
0Day average 181300
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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 Tuesday 23 September 2025, gas supplied 38% of Great Britain’s electricity and wind 15%. Demand peaked at 36.1 GW at 10:00. Carbon intensity averaged 181 g/kWh and the price £91.71/MWh. Wind generation peaked at 6.1 GW at 00:20. Solar generation peaked at 10.2 GW at 12:00. Carbon intensity was lowest at 12:30 (134 g/kWh) and highest at 18:30 (229 g/kWh). The wholesale price ranged from £73.42/MWh at 13:00 to £130.67/MWh at 07:30. Gas made 46% of the electricity generated in Great Britain, compared with 32% across 2025.

Charts

Generation, demand, price and carbon

Generation by sourceGW · daily average below
Solar 2.859.1%Wind 4.6214.8%Gas 11.9038.1%Hydro 0.501.6%Biomass 3.2710.5%Nuclear 2.518.0%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 29.6avgGeneration 25.6avgTransfers 3.9avg
The day in figurespeaks, averages, totals
Peak demand36.1GW · 10:00
Low 21.7 · 04:25Avg 29.60–40 GW
Made in Great Britain87%of demand
Generation 25.6Transfers 3.9 GW
Net imports89GWh
In
129 Out
40
Zero-carbon share41%of generation
Nuclear 10%Hydro 2%Wind 18%Solar 11%

Transfers · Tue 23 Sept

Interconnectors and storage

On Tuesday 23 September 2025, Great Britain imported 129 GWh and exported 40 GWh through its interconnectors. The most came from France (72 GWh), and the most exports went to Ireland (29 GWh).

All interconnectors

Tue 23 Sept
Imported
129GWh
Exported
40GWh
Net in
89GWh
Average net flow
3.73GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.00GWIdle

In 0.0 GWhOut 0.0 GWh

Denmark

Viking Link

Average0.17GWImporting

In 9.8 GWhOut 5.7 GWh

France

IFA · IFA2 · ElecLink

Average2.99GWImporting

In 71.7 GWhOut 0.0 GWh

Ireland

Moyle · East–West · Greenlink

Average1.20GWExporting

In 0.0 GWhOut 28.9 GWh

Netherlands

BritNed

Average0.38GWImporting

In 14.0 GWhOut 4.9 GWh

Norway

North Sea Link

Average1.40GWImporting

In 33.5 GWhOut 0.0 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.19GWGenerating

Generated 4.7 GWhPumped 0.2 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.