History · 2025

GB electricity in 2025

In 2025, Great Britain generated 289.2 TWh of electricity, at an average carbon intensity of 126.9 gCO₂/kWh, with wind supplying 29.7% of generation.

Generation: 289.2 TWh
Avg carbon: 126.9; gCO₂/kWh
Renewable share: 37.3%; wind + solar + hydro
Peak demand: 45.9 GW; 2025-01-09

Share of generation by fuel

Wind: 29.7%
Solar: 6.5%
Nuclear: 11.8%
Biomass: 6.9%
Hydro: 1.2%
Gas: 26.7%
Coal: 0.0%
Imports: 15.2%
Other: 1.6%
Low-carbon total: 56.0%

Yearly averages of NESO's half-hourly historic mix. Wind includes NESO's embedded estimate; "not tracked" means the national data didn't break that fuel out yet - not that none was generated.

Carbon extremes of 2025

Greenest half-hour: 22 gCO₂/kWh; 2025-05-29 09:00 UTC
Dirtiest half-hour: 295 gCO₂/kWh; 2025-01-22 07:00 UTC

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