Trawsfynydd is unusual within the British fleet because of its inland lake setting inside a mountainous Welsh landscape.
MagnoxGwyneddWalesCommissioned 1965Closed 1991
Site imageDecommissioning
Trawsfynydd Power StationTrawsfynydd in its upland setting in Gwynedd, one of the most distinctive nuclear landscapes in the UK.
Image credit: Phil Brandon Hunter / Wikimedia Commons · CC BY-SA 2.0
MagnoxTechnical views
Early UK gas-cooled nuclear arrangement showing the reactor, heat exchangers, steam cycle and cooling system.
Indicative coastal layout showing the reactor island, turbine hall, intake and outfall structures, switchyard and supporting site systems.
Indicative station-form view showing the principal structures and site massing associated with this station type.
Station map context
OpenStreetMap view showing the actual atlas coordinate for Trawsfynydd, with a wider local view and a closer site-focused view.
Wider location
This view places the station in its surrounding district, coast or industrial corridor.
Approx. coordinate used: 52.929, -3.936
Closer site view
This tighter map makes the specific site position much clearer for the station record.
Marker placed on the stored station coordinate in the atlas dataset.
Reference snapshot
StatusDecommissioning
FuelNuclear
TechnologyMagnox
Capacity390 MW
Commissioned1965
Closed1991
RegionGwynedd
NationWales
OwnerNDA
OperatorNuclear Restoration Services
Why it matters
Inland Magnox station
Highly distinctive landscape setting
Closed in 1991
This summary focuses on the key facts that explain the station’s role in the wider UK generation system.
Station timeline
These timeline entries highlight the main milestones for the site, including commissioning, major changes, closure and current status where relevant.
1965Commissioned
Entered service in an earlier generation of the UK nuclear programme.
1991Generation ended
The station stopped generating and entered post-operational work such as defuelling, care and maintenance, or site restoration.
1992Long afterlife
Nuclear sites remain active long after closure because the clean-up cycle is measured in decades rather than months.
Reading the landscape
Power-station siting reflects engineering requirements, fuel and water logistics, grid access, industrial geography and the planning frameworks of the period in which the site was developed. Trawsfynydd should therefore be read as part of a wider infrastructure system rather than as an isolated structure in the landscape.
Approx. coordinates: 52.929, -3.936
Source notes
Operational fleet context uses EDF’s January 2026 fleet update. Magnox and legacy clean-up context uses NDA / Nuclear Restoration Services site portfolios.
Capacities and years in this historical reference layer are simplified reference figures and should be checked against primary records where exact regulatory or reporting precision is required.
Gallery notes
These notes highlight the main structures, layout characteristics and historic changes associated with the station. They are intended as a concise interpretive layer alongside the reference data, timeline and technical diagrams.
Reactor typology
Magnox, AGR, PWR and EPR each imply different buildings, containment forms, fuel systems and visual signatures.
Landscape logic
Coastal siting often reflected cooling-water needs, grid access and strategic planning rather than scenic coincidence.
After generation
Unlike fossil stations, nuclear sites usually remain highly active long after electricity generation has ceased.
This record can be expanded further with licensed site plans, archival photography, demolition or redevelopment updates, fuller unit-level timelines and linked planning or environmental documentation.
