Electricity Live

Great Britain’s electricity on Wednesday 21 May 2025

On Wednesday 21 May, demand averaged 28.1 GW. Renewables supplied 34%.

28.1GW AVERAGEWind6.26 GW21%Hydro0.16 GW1%Biomass2.79 GW9%Solar3.52 GW12%Gas6.89 GW23%Imports4.58 GW16%Nuclear5.28 GW18%28.1GW AVERAGE21%9%12%23%16%18%
Price
£84.76/MWh
Day average £84.76
Demand28.1GW
Generation 24.9Transfers 3.2
Fossil fuels23%
Renewables34%
Other43%
Carbon intensityModerate
122g/kWh
0Day average 122300
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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 21 May 2025, gas supplied 23% of Great Britain’s electricity and wind 21%. Demand peaked at 33.9 GW at 13:30. Carbon intensity averaged 122 g/kWh and the price £84.76/MWh. Wind generation peaked at 9.0 GW at 17:35. Solar generation peaked at 10.9 GW at 14:00. Carbon intensity was lowest at 15:30 (68 g/kWh) and highest at 00:00 (162 g/kWh). The wholesale price ranged from £43.97/MWh at 15:30 to £109.44/MWh at 01:00. Gas made 28% 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 3.5212.0%Wind 6.2621.2%Gas 6.8923.4%Hydro 0.160.5%Biomass 2.799.5%Nuclear 5.2817.9%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 28.1avgGeneration 24.9avgTransfers 3.2avg
The day in figurespeaks, averages, totals
Peak demand33.9GW · 13:30
Low 21.1 · 04:00Avg 28.10–40 GW
Made in Great Britain89%of demand
Generation 24.9Transfers 3.2 GW
Net imports79GWh
In
109 Out
30
Zero-carbon share61%of generation
Nuclear 21%Hydro 1%Wind 25%Solar 14%

Transfers · Wed 21 May

Interconnectors and storage

On Wednesday 21 May 2025, Great Britain imported 109 GWh and exported 30 GWh through its interconnectors. The most came from France (56 GWh), and the most exports went to Ireland (20 GWh).

All interconnectors

Wed 21 May
Imported
109GWh
Exported
30GWh
Net in
79GWh
Average net flow
3.29GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.00GWIdle

In 7.1 GWhOut 7.0 GWh

Denmark

Viking Link

Average0.00GWIdle

In 0.0 GWhOut 0.0 GWh

France

IFA · IFA2 · ElecLink

Average2.35GWImporting

In 56.4 GWhOut 0.0 GWh

Ireland

Moyle · East–West · Greenlink

Average0.82GWExporting

In 0.0 GWhOut 19.7 GWh

Netherlands

BritNed

Average0.36GWImporting

In 12.4 GWhOut 3.7 GWh

Norway

North Sea Link

Average1.40GWImporting

In 33.5 GWhOut 0.0 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.06GWPumping

Generated 0.4 GWhPumped 1.8 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.