Sizewell

Leiston, Suffolk

Technical specifications, photos, nearby jobs, satellite map, and per diem rates for Sizewell.

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Reactor Data

Reactor Units

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Every power reactor at this site as listed in the IAEA Power Reactor Information System (PRIS): reactor type and model, net electrical capacity, grid connection and commercial operation dates, and current status.
3 units: 1 operational, 2 permanent shutdown. Net capacity in service: 1,198 MWe.
Unit Type Model Net MWe Construction Grid Commercial Op Shutdown Status
Sizewell A-1 GCR MAGNOX 210 1961-04-01 1966-01-21 1966-03-25 2006-12-31 Permanent Shutdown
Sizewell A-2 GCR MAGNOX 210 1961-04-01 1966-04-09 1966-09-15 2006-12-31 Permanent Shutdown
Sizewell B PWR SNUPPS 1,198 1988-07-18 1995-02-14 1995-09-22 Operational
Capacity, milestones and suppliers
Unit Design MWe Gross MWe Thermal MWt First Criticality Reactor Supplier Turbine Supplier Notes
Sizewell A-1 290 245 1,010 1965-06-01 THE ENGLISH ELECTRIC CO., LTD / BABCOCK & WILCOX CO. / TAYLOR WOODROW CONSTRUCTION, LTD. THE ENGLISH ELECTRIC CO., LTD.
Sizewell A-2 290 245 1,010 1965-12-01 THE ENGLISH ELECTRIC CO., LTD / BABCOCK & WILCOX CO. / TAYLOR WOODROW CONSTRUCTION, LTD. THE ENGLISH ELECTRIC CO., LTD.
Sizewell B 1,188 1,250 3,425 1995-01-31 PWR POWER PROJECTS, Ltd. GENERAL ELECTRIC COMPANY (UK)
Lifetime performance, through 2025
Unit Electricity Supplied Load Factor Energy Availability Operating Factor
Sizewell A-1 56.8 TWh 74.7% 74.8% 84.3%
Sizewell A-2 53.4 TWh 71.3% 71.5% 80.9%
Sizewell B 243.6 TWh 83.7% 84.3% 86.4%
Operator: MAGNOX, LTD; EDF Energy
Owner: Nuclear Decommissioning Authority; EDF Energy
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-19.

Working Here

Per Diem Rates FY 2026

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Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from the U.S. State Department foreign per diem tables for FY 2026.
$252
Lodging/Night
$108
M&IE/Day
$360
Total/Day
United Kingdom: rate for locations the State Department does not list separately
U.S. Department of State foreign per diem, for U.S. government and contractor travel.

Photos

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Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.

Facility Map

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Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.

52.2153, 1.62203

Location & Contact

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Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Address:
Leiston, Suffolk IP16 4UE, United Kingdom
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Plant Facts

About This Site

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Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Sizewell nuclear power station.

Sizewell is a nuclear power station site near the village of Sizewell, close to Leiston in Suffolk, England, on the North Sea coast. It has two stations, Sizewell A and Sizewell B.

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Sizewell A had two Magnox reactors, built by British Nuclear Design and Construction, a consortium of English Electric, Babcock & Wilcox and Taylor Woodrow. Construction began on 1 April 1961, and both units entered service in 1966. They were permanently shut down on 31 December 2006. Sizewell B has a single pressurized water reactor. A public inquiry into its design ran from 1982 to 1985, construction began in the late 1980s, and it was first synchronized with the national grid on 14 February 1995.