The average carbon intensity for GB was 129 g/kWh in the week to 6 October.
Wind and gas dominated the mix
Wind provided 33.7% of the generation mix in the week to 6 October. Gas supplied 27.1% while nuclear contributed 13.1%. Biomass and imports accounted for 8.2% and 7.4% respectively. Solar and hydro provided 6.1% and 2.1%. Coal had a 0% share in the week to 6 October.
Wind share varied throughout the week
Wind share peaked at 68.7% at 01:00 on Wednesday 30 September. It fell to 7.4% at 09:00 on Tuesday 6 October.
Midday offered the lowest carbon intensity
The cleanest half-hour was 54 g/kWh at 11:00 on Sunday 4 October. The dirtiest half-hour was 231 g/kWh at 07:00 on Tuesday 6 October. Average carbon intensity for the hours of 12:00–13:00, 13:00–14:00 and 11:00–12:00 were 73.3 g/kWh, 74.6 g/kWh and 74.7 g/kWh. Evening hours were dirtier with averages of 174.6 g/kWh, 171.2 g/kWh and 166.7 g/kWh from 18:00 to 21:00.
Regional figures are a snapshot at the time of writing. Carbon intensity was 0 g/kWh in North Scotland and 0 g/kWh in South Scotland. Other regions ranged from 2 g/kWh in North East England to 376 g/kWh in South Wales.
Run high-energy appliances during the midday period to use lower carbon power.
This article was generated automatically on 6 October 2026 from public data. Figures cover the seven days to publication.