Electricity Live

Great Britain’s electricity on Monday 15 September 2025

On Monday 15 September, demand averaged 29.9 GW. Renewables supplied 69%.

29.9GW AVERAGEWind18.91 GW61%Hydro0.39 GW1%Biomass0.91 GW3%Solar2.27 GW7%Gas3.13 GW10%Imports3.00 GW10%Nuclear2.63 GW8%29.9GW AVERAGE61%7%10%10%8%
Price
£27.47/MWh
Day average £27.47
Demand29.9GW
Generation 28.3Transfers 1.7
Fossil fuels10%
Renewables69%
Other21%
Carbon intensityLow
54g/kWh
0Day average 54300
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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

Records set on this day

All records

Key moments

On Monday 15 September 2025, wind supplied 61% of Great Britain’s electricity and gas 10%. Demand peaked at 36.2 GW at 15:25. Carbon intensity averaged 54 g/kWh and the price £27.47/MWh. Wind generation peaked at 20.7 GW at 15:35. Solar generation peaked at 7.9 GW at 12:30. Carbon intensity was lowest at 12:00 (37 g/kWh) and highest at 06:30 (71 g/kWh). The wholesale price ranged from −£9.41/MWh at 05:00 to £95.42/MWh at 20:00. The price was below zero for 1.5 hours. Wind made 67% 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 2.277.3%Wind 18.9160.5%Gas 3.1310.0%Hydro 0.391.3%Biomass 0.912.9%Nuclear 2.638.4%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 29.9avgGeneration 28.3avgTransfers 1.7avg
The day in figurespeaks, averages, totals
Peak demand36.2GW · 15:25
Low 20.8 · 04:30Avg 29.90–40 GW
Made in Great Britain94%of demand
Generation 28.3Transfers 1.7 GW
Net imports46GWh
In
69 Out
23
Zero-carbon share86%of generation
Nuclear 9%Hydro 1%Wind 67%Solar 8%

Transfers · Mon 15 Sept

Interconnectors and storage

On Monday 15 September 2025, Great Britain imported 69 GWh and exported 23 GWh through its interconnectors. The most came from France (39 GWh), and the most exports went to Norway (9 GWh).

All interconnectors

Mon 15 Sept
Imported
69GWh
Exported
23GWh
Net in
46GWh
Average net flow
1.90GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.30GWImporting

In 9.9 GWhOut 2.7 GWh

Denmark

Viking Link

Average0.60GWImporting

In 15.6 GWhOut 1.2 GWh

France

IFA · IFA2 · ElecLink

Average1.52GWImporting

In 38.6 GWhOut 2.2 GWh

Ireland

Moyle · East–West · Greenlink

Average0.22GWExporting

In 0.7 GWhOut 6.1 GWh

Netherlands

BritNed

Average0.06GWExporting

In 0.1 GWhOut 1.4 GWh

Norway

North Sea Link

Average0.24GWExporting

In 3.7 GWhOut 9.4 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.24GWPumping

Generated 3.5 GWhPumped 9.2 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.