Electricity Live

Great Britain’s electricity on Wednesday 17 September 2025

On Wednesday 17 September, demand averaged 29.7 GW. Renewables supplied 55%.

29.7GW AVERAGEWind15.42 GW51%Hydro0.33 GW1%Biomass2.30 GW8%Solar0.93 GW3%Gas3.81 GW13%Imports5.02 GW17%Nuclear2.50 GW8%29.7GW AVERAGE51%8%13%17%8%
Price
£59.48/MWh
Day average £59.48
Demand29.7GW
Generation 25.3Transfers 4.5
Fossil fuels13%
Renewables55%
Other32%
Carbon intensityLow
74g/kWh
0Day average 74300
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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 Wednesday 17 September 2025, wind supplied 51% of Great Britain’s electricity and gas 13%. Demand peaked at 36.2 GW at 12:25. Carbon intensity averaged 74 g/kWh and the price £59.48/MWh. Wind generation peaked at 19.6 GW at 15:10. Solar generation peaked at 3.6 GW at 14:00. Carbon intensity was lowest at 14:30 (49 g/kWh) and highest at 07:00 (100 g/kWh). The wholesale price ranged from £21.49/MWh at 14:30 to £99.32/MWh at 08:00. Wind made 61% 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 0.933.1%Wind 15.4250.9%Gas 3.8112.6%Hydro 0.331.1%Biomass 2.307.6%Nuclear 2.508.2%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 29.7avgGeneration 25.3avgTransfers 4.5avg
The day in figurespeaks, averages, totals
Peak demand36.2GW · 12:25
Low 21.6 · 04:25Avg 29.70–40 GW
Made in Great Britain85%of demand
Generation 25.3Transfers 4.5 GW
Net imports110GWh
In
118 Out
8
Zero-carbon share76%of generation
Nuclear 10%Hydro 1%Wind 61%Solar 4%

Transfers · Wed 17 Sept

Interconnectors and storage

On Wednesday 17 September 2025, Great Britain imported 118 GWh and exported 8 GWh through its interconnectors. The most came from France (55 GWh), and the most exports went to Ireland (4 GWh).

All interconnectors

Wed 17 Sept
Imported
118GWh
Exported
8GWh
Net in
110GWh
Average net flow
4.57GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.01GWImporting

In 3.5 GWhOut 3.2 GWh

Denmark

Viking Link

Average0.91GWImporting

In 22.3 GWhOut 0.6 GWh

France

IFA · IFA2 · ElecLink

Average2.24GWImporting

In 54.6 GWhOut 0.8 GWh

Ireland

Moyle · East–West · Greenlink

Average0.14GWImporting

In 7.3 GWhOut 3.9 GWh

Netherlands

BritNed

Average0.00GWIdle

In 0.0 GWhOut 0.0 GWh

Norway

North Sea Link

Average1.27GWImporting

In 30.5 GWhOut 0.0 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.12GWPumping

Generated 2.2 GWhPumped 5.2 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.