Electricity Live

Great Britain’s electricity on Sunday 21 September 2025

On Sunday 21 September, demand averaged 27.0 GW. Renewables supplied 56%.

27.0GW AVERAGEWind13.16 GW45%Hydro0.26 GW1%Biomass1.67 GW6%Solar3.06 GW10%Gas4.15 GW14%Imports4.44 GW15%Nuclear2.44 GW8%27.0GW AVERAGE45%10%14%15%8%
Price
£35.21/MWh
Day average £35.21
Demand27.0GW
Generation 24.7Transfers 2.2
Fossil fuels14%
Renewables56%
Other29%
Carbon intensityLow
76g/kWh
0Day average 76300
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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 Sunday 21 September 2025, wind supplied 45% of Great Britain’s electricity and gas 14%. Demand peaked at 32.5 GW at 16:55. Carbon intensity averaged 76 g/kWh and the price £35.21/MWh. Wind generation peaked at 18.2 GW at 00:15. Solar generation peaked at 10.5 GW at 12:30. Carbon intensity was lowest at 12:00 (43 g/kWh) and highest at 18:30 (123 g/kWh). The wholesale price ranged from −£12.12/MWh at 12:30 to £103.38/MWh at 20:00. The price was below zero for 4 hours. Wind made 53% 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 3.0610.5%Wind 13.1645.1%Gas 4.1514.2%Hydro 0.260.9%Biomass 1.675.7%Nuclear 2.448.4%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 27.0avgGeneration 24.7avgTransfers 2.2avg
The day in figurespeaks, averages, totals
Peak demand32.5GW · 16:55
Low 19.6 · 04:45Avg 27.00–40 GW
Made in Great Britain92%of demand
Generation 24.7Transfers 2.2 GW
Net imports63GWh
In
105 Out
42
Zero-carbon share76%of generation
Nuclear 10%Hydro 1%Wind 53%Solar 12%

Transfers · Sun 21 Sept

Interconnectors and storage

On Sunday 21 September 2025, Great Britain imported 105 GWh and exported 42 GWh through its interconnectors. The most came from France (46 GWh), and the most exports went to Ireland (31 GWh).

All interconnectors

Sun 21 Sept
Imported
105GWh
Exported
42GWh
Net in
63GWh
Average net flow
2.61GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.36GWImporting

In 13.5 GWhOut 4.8 GWh

Denmark

Viking Link

Average0.96GWImporting

In 23.2 GWhOut 0.2 GWh

France

IFA · IFA2 · ElecLink

Average1.84GWImporting

In 46.0 GWhOut 1.7 GWh

Ireland

Moyle · East–West · Greenlink

Average1.29GWExporting

In 0.0 GWhOut 30.9 GWh

Netherlands

BritNed

Average0.01GWImporting

In 0.4 GWhOut 0.2 GWh

Norway

North Sea Link

Average0.72GWImporting

In 22.0 GWhOut 4.7 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.38GWPumping

Generated 1.3 GWhPumped 10.5 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.