In November 2024, Britain's electricity averaged 171 gCO₂/kWh, in the moderate band (140–219 g). That is 24% dirtier than October 2024 (138 g), and 6% dirtier than November 2023 (161 g). Gas made 38.0% of the electricity generated, wind 27.4%, nuclear 13.0% and imports 11.4%; low-carbon sources together made 50.6%. The cleanest half hour was 52 g at 05:30 on Sunday 24 November, and the dirtiest 275 g at 20:30 on Tuesday 26 November. Sunday 24 November was both the cleanest day (68 g on average) and the windiest (62.4% wind).
Carbon intensity, day by day
Day by day, as a table
| Day | gCO₂/kWh | Low-carbon | Wind | Solar | Gas | Half hours |
|---|---|---|---|---|---|---|
| Fri 1 Nov | 189 | 42.3% | 17.9% | 1.1% | 41.3% | 48 |
| Sat 2 Nov | 191 | 42.1% | 16.2% | 0.9% | 41.8% | 48 |
| Sun 3 Nov | 216 | 34.5% | 7.8% | 0.7% | 47.0% | 48 |
| Mon 4 Nov | 242 | 31.3% | 6.3% | 0.7% | 56.2% | 48 |
| Tue 5 Nov | 257 | 30.7% | 5.3% | 0.8% | 58.7% | 48 |
| Wed 6 Nov | 237 | 38.8% | 10.3% | 1.4% | 47.5% | 48 |
| Thu 7 Nov | 197 | 47.6% | 22.4% | 0.5% | 45.4% | 48 |
| Fri 8 Nov | 216 | 39.8% | 14.5% | 0.5% | 49.9% | 48 |
| Sat 9 Nov | 223 | 34.3% | 7.6% | 0.5% | 50.9% | 48 |
| Sun 10 Nov | 177 | 46.6% | 19.7% | 1.0% | 39.9% | 48 |
| Mon 11 Nov | 149 | 53.9% | 30.2% | 2.4% | 33.2% | 48 |
| Tue 12 Nov | 180 | 46.3% | 22.5% | 2.0% | 40.9% | 48 |
| Wed 13 Nov | 211 | 41.1% | 15.0% | 2.3% | 49.5% | 48 |
| Thu 14 Nov | 200 | 43.6% | 16.1% | 1.8% | 45.9% | 48 |
| Fri 15 Nov | 174 | 52.9% | 28.5% | 1.4% | 40.4% | 48 |
| Sat 16 Nov | 98 | 69.4% | 44.7% | 1.0% | 18.6% | 48 |
| Sun 17 Nov | 103 | 66.1% | 39.1% | 1.9% | 19.5% | 48 |
| Mon 18 Nov | 189 | 43.4% | 18.5% | 1.0% | 41.6% | 48 |
| Tue 19 Nov | 140 | 56.0% | 35.4% | 0.6% | 29.7% | 48 |
| Wed 20 Nov | 131 | 59.7% | 40.2% | 2.3% | 29.5% | 48 |
| Thu 21 Nov | 163 | 52.2% | 31.9% | 1.6% | 38.4% | 48 |
| Fri 22 Nov | 160 | 55.6% | 31.3% | 2.3% | 36.0% | 48 |
| Sat 23 Nov | 87 | 74.8% | 53.3% | 0.2% | 15.3% | 48 |
| Sun 24 Nov | 68 | 81.3% | 62.4% | 0.7% | 13.5% | 48 |
| Mon 25 Nov | 91 | 75.0% | 54.7% | 2.1% | 18.9% | 48 |
| Tue 26 Nov | 195 | 45.2% | 23.8% | 2.6% | 43.0% | 48 |
| Wed 27 Nov | 208 | 41.0% | 22.4% | 1.0% | 46.9% | 48 |
| Thu 28 Nov | 213 | 40.5% | 22.8% | 1.9% | 48.5% | 48 |
| Fri 29 Nov | 126 | 64.3% | 48.3% | 1.6% | 27.8% | 48 |
| Sat 30 Nov | 112 | 67.7% | 51.6% | 0.9% | 23.3% | 48 |
What powered the grid
Each fuel's average share of the electricity generated in Great Britain in November 2024, with November 2023 beneath it for comparison. Imports count as one source, as NESO counts them.
Hours in each carbon band
- Very low (under 70 g): 46 hours, 6%
- Low (70–139 g): 181 hours, 25%
- Moderate (140–219 g): 312 hours, 43%
- High (220–299 g): 182 hours, 25%
Records in November 2024
- Cleanest half hour
- 52 g 05:30 on Sunday 24 November
- Dirtiest half hour
- 275 g 20:30 on Tuesday 26 November
- Most wind
- 70.1% 05:30 on Sunday 24 November
- Most solar
- 13.2% 11:30 on Tuesday 26 November
- Most low-carbon
- 88.6% 05:30 on Sunday 24 November
- Least gas
- 8.2% 04:30 on Saturday 23 November
- Cleanest day
- 68 g Sunday 24 November
- Dirtiest day
- 257 g Tuesday 5 November
- Windiest day
- 62.4% wind Sunday 24 November
- Sunniest day
- 2.6% solar Tuesday 26 November
About these figures
GridMonkey records NESO's carbon intensity and generation mix for Great Britain every half hour: the actual figure where NESO has published one, otherwise its forecast. They are added up by UK calendar day and month. Percentages are shares of the electricity generated, imports included, so the fuels add up to 100%. Low-carbon means wind, solar, nuclear, biomass and hydro. The carbon bands are GridMonkey's: very low under 70 g, low 70–139 g, moderate 140–219 g, high 220–299 g and very high 300 g or more, per kWh. Northern Ireland has its own grid and isn't included.
To see the grid now, open GridMonkey. For the wind farms that ran hardest this week, see the wind farm league table.
Data: NESO Carbon Intensity API (carbonintensity.org.uk), licensed under CC BY 4.0, recorded and summarised by GridMonkey. Figures as of 21 October 2026.