The week on the grid
Each finished week in one place: how clean electricity was, what it traded for and how much renewable output was turned down.
From 21 September to 27 September 2026, renewables averaged 46% of electricity, carbon intensity averaged 136 gCO₂/kWh and wholesale prices went negative for 3 half hours. Generators were paid £11.7 million to switch off 328,607 MWh of renewable output. Figures as compiled at 08:30 GMT on 6 November 2026.
21 September to 27 September 2026
Renewable share
46%
28% lower than the week before
49% low carbon, including nuclear
Average carbon intensity
136gCO₂/kWh
57% higher than the week before
Lowest 47 at 14:30 on 27 Sep
Average wholesale price
14.67p/kWh
39% higher than the week before
Peaked at 23.68p at 18:00 on 22 Sep
Negative-price half hours
3
Lowest price -0.37p at 11:00 on 27 Sep
Renewables turned down
328,607MWh
39% lower than the week before
£11.7 million paid to switch off
Average generation mix
Each source's share, averaged across the week's half hours. Includes embedded solar and wind.
| Source | Average share |
|---|---|
| Gas | 27.0% |
| Wind | 26.5% |
| Nuclear | 13.3% |
| Imports | 11.4% |
| Biomass | 9.7% |
| Solar | 7.3% |
| Other | 2.7% |
| Hydro | 2.2% |
Other weeks
| Week | Renewable | Avg gCO₂/kWh | Negative-price half hours |
|---|---|---|---|
| 26 October to 1 November 2026 | 43% | 149 | 0 |
| 19 October to 25 October 2026 | 54% | 100 | 7 |
| 12 October to 18 October 2026 | 55% | 98 | 0 |
| 5 October to 11 October 2026 | 53% | 109 | 0 |
| 28 September to 4 October 2026 | 49% | 132 | 0 |
| 21 September to 27 September 2026 | 46% | 136 | 3 |
| 14 September to 20 September 2026 | 63% | 87 | 33 |
| 7 September to 13 September 2026 | 54% | 109 | 8 |
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