Where did Britain's electricity actually come from this month?
Thirty days of generation data from across the GB transmission system, broken down by source.
A snapshot of how a decarbonising grid actually behaves — minute by minute, source by source.
Total generation
22.4TWh
over 30 days
Low-carbon share
71%
wind, nuclear, solar, hydro
Avg. carbon intensity
128gCO₂/kWh
range: 41–286
Peak gas hour
17:30
12 Apr, evening peak
Figure 01
A month of generation, by source
Daily share of electricity generation across the GB transmission system. Click any source in the legend to isolate it.
Hover the chart for the full daily breakdown.
Fetching live data
api.carbonintensity.org.uk
The signal in the noise
On three separate days in April, wind alone met more than 60% of demand. On three others, gas was forced above 40%.
The grid's job is to make those days look the same to the customer.
Figure 02
The carbon intensity curve
Half-hourly carbon intensity over the same 30-day window. The vertical bands mark the cleanest and dirtiest hours of the period.
Fetching live data
api.carbonintensity.org.uk
Figure 03
The 30-day average
Total share of generation by source across the period.
Fetching live data
api.carbonintensity.org.uk
Figure 04
When each source works hardest
Average output share by hour-of-day. Reveals the daily rhythm of the grid.