Electricity Live

Great Britain’s electricity on Tuesday 21 September 2021

On Tuesday 21 September, demand averaged 29.9 GW. Renewables supplied 22%.

29.9GW AVERAGEWind4.76 GW16%Hydro0.11 GW0%Biomass1.64 GW5%Solar1.89 GW6%Gas13.85 GW46%Coal0.76 GW2%Imports2.39 GW8%Nuclear4.92 GW16%29.9GW AVERAGE16%46%8%16%
Price
£151.45/MWh
Day average £151.45
Demand29.9GW
Generation 27.9Transfers 2.0
Fossil fuels46%
Renewables22%
Other30%
Carbon intensityHigh
230g/kWh
0Day average 230300
Save as image
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 21 September 2021, gas supplied 46% of Great Britain’s electricity and nuclear 16%. Demand peaked at 36.0 GW at 16:55. Carbon intensity averaged 230 g/kWh and the price £151.45/MWh. Wind generation peaked at 7.1 GW at 23:50. Solar generation peaked at 6.5 GW at 12:30. Carbon intensity was lowest at 23:30 (167 g/kWh) and highest at 07:00 (274 g/kWh). The wholesale price ranged from £111.82/MWh at 02:00 to £236.61/MWh at 07:30. Gas made 50% of the electricity generated in Great Britain, compared with 42% across 2021.

Charts

Generation, demand, price and carbon

Generation by sourceGW · daily average below
Solar 1.896.2%Wind 4.7615.7%Gas 13.8545.7%Hydro 0.110.4%Biomass 1.645.4%Nuclear 4.9216.2%Coal 0.762.5%
Price£/MWh
Carbon intensitygCO₂/kWh
Demand and generationGW
Demand 29.9avgGeneration 27.9avgTransfers 2.0avg
The day in figurespeaks, averages, totals
Peak demand36.0GW · 16:55
Low 20.7 · 04:00Avg 29.90–40 GW
Made in Great Britain93%of demand
Generation 27.9Transfers 2.0 GW
Net imports47GWh
In
52 Out
5
Zero-carbon share42%of generation
Nuclear 18%Hydro 0%Wind 17%Solar 7%

Transfers · Tue 21 Sept

Interconnectors and storage

On Tuesday 21 September 2021, Great Britain imported 52 GWh and exported 5 GWh through its interconnectors. The most came from France (25 GWh), and the most exports went to Ireland (5 GWh).

All interconnectors

Tue 21 Sept
Imported
52GWh
Exported
5GWh
Net in
47GWh
Average net flow
1.97GW in

Into Great BritainOut of Great Britain

Belgium

Nemo Link

Average0.17GWImporting

In 4.1 GWhOut 0.0 GWh

Denmark

Viking Link

Average0.00GWIdle

In 0.0 GWhOut 0.0 GWh

France

IFA · IFA2 · ElecLink

Average1.03GWImporting

In 24.7 GWhOut 0.0 GWh

Ireland

Moyle · East–West · Greenlink

Average0.18GWExporting

In 0.5 GWhOut 4.8 GWh

Netherlands

BritNed

Average0.94GWImporting

In 22.6 GWhOut 0.0 GWh

Norway

North Sea Link

Average0.00GWIdle

In 0.1 GWhOut 0.1 GWh

Pumped storage

Dinorwig · Cruachan · Ffestiniog · Foyers

Average0.04GWGenerating

Generated 5.3 GWhPumped 4.4 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.