Trawsfynydd nuclear power plant — United Kingdom

Trawsfynydd nuclear power plant is a retired nuclear power station in Gwynedd, United Kingdom. Its current lifecycle status is “Retired” — so it is not yet, or no longer, generating at full output. It ranks #88 of 2,860 United Kingdom power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 12.4% of United Kingdom's electricity; the national grid averages 217 gCO₂/kWh (64.4% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id GEM_nuc_trawsfynydd_unite.

Data provenance

Source of the capacity and fuel values:

capacity: GEM Global Nuclear Power Tracker September 2025 unit-status sum (retired); fuel: GEM GNPT

In context: how this plant compares

At 470 MW, Trawsfynydd nuclear power plant is below the median nuclear plant in United Kingdom (965 MW). Technically it is described as gas-cooled reactor. Its lifecycle status is Retired; it no longer generates electricity. Nuclear plants split uranium to raise steam with no direct CO₂; they run as steady baseload with very high capacity factors and the longest operating lifetimes of any thermal plant.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

How it compares & nearby plants

The #18 largest nuclear power plant of 25 in United Kingdom by capacity.

United Kingdom has 25 nuclear power plants in this dataset, together about 27,683 MW of capacity.

Nearby power plants

• Maentwrog · Hydro · 30 MW · Wales
• Ffestiniog · Hydro · 384 MW · Wales
• Llyn Celyn · Hydro · 4.5 MW · Wales
• Dinorwig · Hydro · 1,800 MW · Wales
• Dinorwig · Hydro · 1,728 MW · Wales
• Hafoty Ucha '2' and '3' Wind Turbine · Wind · 2.6 MW · Wales

Location

Coordinates 52.9252, -3.9474 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions