Wind and gas were almost level, at 23.7% and 23.6% of generation, with nuclear next at 15%. Zero-carbon sources (wind, solar, nuclear and hydro) made up 51%, and wind's share peaked at 61.8% at 04:00 on Thursday 6 August.
Wind supplied the most power, 24%
Average share of generation in August 2026. The tick marks a year earlier. No tick for hydro: the source has a gap for August 2025.
- Wind24%, 28% a year earlier
- Gas24%, 26% a year earlier
- Nuclear15%, 13% a year earlier
- Imports14%, 16% a year earlier
- Biomass9%, 9% a year earlier
- Solar11%, 10% a year earlier
- Hydro1%
Scale: 0 to 50%.
The cleanest day was Wednesday 5 August (65 g/kWh) and the dirtiest Monday 17 August (207 g/kWh). The cleanest single half-hour, 34 g/kWh, was at 11:30 on Thursday 6 August.
Intensity was below 100 g/kWh in 37% of half-hours, the same share as a year earlier.
The cleanest day was Wednesday 5 August, at 65 g/kWh
Every half hour, coloured by the Carbon Intensity API's national band.
Tap or point at a half hour to read it.
- Very low
- Low
- Moderate
- High
- Very high
Balancing the grid cost NESO £193 million. Of that, £173 million (89%) went on constraints, mostly paying generators to change output when power lines were full (£141 million), and 824 GWh of generation was turned down because the network could not carry it.
On Agile Octopus in London, the unit price averaged 25.1p/kWh and ranged from −4.2p to 68.6p. Prices were below zero in 29 half-hours, when customers were paid to use electricity.