Sizewell A sits beside Sizewell B and the proposed Sizewell C, making the Suffolk coast one of the clearest examples of nuclear continuity across generations.
MagnoxSuffolkEnglandCommissioned 1966Closed 2006
Site imageDecommissioning
Sizewell A Power StationSizewell A on the Suffolk coast, included here as the historic Magnox station on the wider Sizewell site.
Image credit: N Chadwick / 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 Sizewell A, 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: 52.214, 1.622
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
Capacity420 MW
Commissioned1966
Closed2006
RegionSuffolk
NationEngland
OwnerNDA
OperatorNuclear Restoration Services
Why it matters
Magnox site
Closed in 2006
Part of the layered Sizewell site
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.
1966Commissioned
Entered service in an earlier generation of the UK nuclear programme.
2006Generation ended
The station stopped generating and entered post-operational work such as defuelling, care and maintenance, or site restoration.
2007Long 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. Sizewell A should therefore be read as part of a wider infrastructure system rather than as an isolated structure in the landscape.
Approx. coordinates: 52.214, 1.622
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.
