In June 2022, Britain's electricity averaged 183 gCO₂/kWh, in the moderate band (140–219 g). That is about the same as May 2022 (183 g), and 7% dirtier than June 2021 (171 g). Gas made 42.7% of the electricity generated, wind 22.3%, nuclear 19.5% and solar 6.5%; low-carbon sources together made 54.4%. The cleanest half hour was 50 g at 14:00 on Sunday 26 June, and the dirtiest 288 g at 04:00 on Thursday 30 June. The cleanest day was Saturday 11 June (82 g on average); the windiest was Sunday 26 June (49.0% wind).
Carbon intensity, day by day
Day by day, as a table
| Day | gCO₂/kWh | Low-carbon | Wind | Solar | Gas | Half hours |
|---|---|---|---|---|---|---|
| Wed 1 Jun | 252 | 37.3% | 4.2% | 6.4% | 60.5% | 48 |
| Thu 2 Jun | 243 | 39.8% | 4.5% | 8.0% | 59.7% | 48 |
| Fri 3 Jun | 194 | 52.3% | 19.6% | 6.7% | 47.6% | 48 |
| Sat 4 Jun | 145 | 64.7% | 30.6% | 6.8% | 32.9% | 48 |
| Sun 5 Jun | 165 | 60.0% | 25.4% | 4.7% | 38.6% | 48 |
| Mon 6 Jun | 201 | 49.2% | 15.0% | 3.8% | 46.5% | 48 |
| Tue 7 Jun | 227 | 44.4% | 8.8% | 5.9% | 53.8% | 48 |
| Wed 8 Jun | 190 | 52.9% | 19.4% | 6.2% | 45.5% | 48 |
| Thu 9 Jun | 177 | 56.0% | 26.1% | 4.5% | 42.8% | 48 |
| Fri 10 Jun | 115 | 70.9% | 40.3% | 7.5% | 27.4% | 48 |
| Sat 11 Jun | 82 | 79.5% | 45.4% | 7.8% | 18.4% | 48 |
| Sun 12 Jun | 96 | 75.4% | 38.4% | 8.3% | 20.1% | 48 |
| Mon 13 Jun | 171 | 56.9% | 23.1% | 6.5% | 39.2% | 48 |
| Tue 14 Jun | 215 | 45.8% | 9.6% | 8.2% | 51.0% | 48 |
| Wed 15 Jun | 226 | 45.4% | 8.4% | 8.7% | 52.2% | 48 |
| Thu 16 Jun | 219 | 43.5% | 9.0% | 7.6% | 51.2% | 48 |
| Fri 17 Jun | 134 | 66.4% | 34.1% | 7.5% | 30.4% | 48 |
| Sat 18 Jun | 164 | 58.0% | 29.3% | 3.7% | 38.0% | 48 |
| Sun 19 Jun | 130 | 65.2% | 32.7% | 5.8% | 29.6% | 48 |
| Mon 20 Jun | 204 | 49.4% | 16.4% | 8.7% | 46.8% | 48 |
| Tue 21 Jun | 242 | 39.4% | 6.3% | 8.2% | 56.0% | 48 |
| Wed 22 Jun | 234 | 42.6% | 10.3% | 8.2% | 54.3% | 48 |
| Thu 23 Jun | 245 | 40.4% | 10.5% | 5.5% | 54.1% | 48 |
| Fri 24 Jun | 213 | 45.9% | 17.2% | 4.2% | 51.7% | 48 |
| Sat 25 Jun | 93 | 75.9% | 45.6% | 7.6% | 22.3% | 48 |
| Sun 26 Jun | 90 | 77.6% | 49.0% | 7.7% | 21.3% | 48 |
| Mon 27 Jun | 192 | 51.9% | 24.6% | 6.3% | 46.7% | 48 |
| Tue 28 Jun | 162 | 59.3% | 35.5% | 4.8% | 39.5% | 48 |
| Wed 29 Jun | 207 | 49.3% | 21.6% | 5.0% | 47.7% | 48 |
| Thu 30 Jun | 260 | 36.6% | 6.7% | 5.5% | 56.4% | 48 |
What powered the grid
Each fuel's average share of the electricity generated in Great Britain in June 2022, with June 2021 beneath it for comparison. Imports count as one source, as NESO counts them.
Hours in each carbon band
- Very low (under 70 g): 20 hours, 3%
- Low (70–139 g): 154 hours, 21%
- Moderate (140–219 g): 320 hours, 44%
- High (220–299 g): 228 hours, 32%
Records in June 2022
- Cleanest half hour
- 50 g 14:00 on Sunday 26 June
- Dirtiest half hour
- 288 g 04:00 on Thursday 30 June
- Most wind
- 58.0% 04:00 on Saturday 25 June
- Most solar
- 23.8% 13:00 on Monday 20 June
- Most low-carbon
- 87.9% 14:00 on Sunday 26 June
- Least gas
- 9.4% 14:30 on Sunday 12 June
- Cleanest day
- 82 g Saturday 11 June
- Dirtiest day
- 260 g Thursday 30 June
- Windiest day
- 49.0% wind Sunday 26 June
- Sunniest day
- 8.7% solar Wednesday 15 June
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 25 October 2026.