United Kingdom · 52.212, 1.619Sizewell
Sizewell, nuclear power plant in United Kingdom, operates one pressurized water reactor with 1,198 MW net installed capacity and has been in service since 1966.
Unit Sizewell B has been operating for 31 years, since 1995. Its 1,198 MW net are enough to supply about 3,770,000 households.
- Country
- United Kingdom
- Units
- 3
- Technology
- PWR · GCR
- Net capacity
- 1,198 MWe
- First grid connection
- 1966
- Operator
- EDF Energy · Magnox
- Owner
- EDF Energy Ltd · Nuclear Decommissioning Authority (United Kingdom)
- Status
- Operating
See also: alerts for this plant · every plant in United Kingdom · Vendor: British nuclear consortia (NPC, APC, EE/B&W/T, GEC, NNC) · every PWR reactor · how a PWR works · every GCR reactor · how a GCR works
Units
| Unit | Type | Model | Status | MWe | MWt | Construction start | Grid connection | Closure | Load factor |
|---|---|---|---|---|---|---|---|---|---|
| Sizewell B | Pressurized water (PWR) | SNUPPS | Operating | 1,198 | 3,425 | Jul 18, 1988 | Feb 14, 1995 | — | 84.5 % (2024) |
| Sizewell A1 | Gas-cooled (GCR / AGR) | Magnox | Shut down | 210 | 1,010 | Apr 1961 | Jan 1966 | Dec 2006 | — |
| Sizewell A2 | Gas-cooled (GCR / AGR) | Magnox | Shut down | 210 | 1,010 | Apr 1961 | Apr 1966 | Dec 2006 | — |
Data: IAEA PRIS · Global Energy Monitor · updated on Aug 1, 2026
Sizewell B, a 1,198 MWe PWR (SNUPPS), started construction in 1988, was connected to the grid in 1995 and is still operating, with a 84.5% load factor in 2024.
Sizewell A1, a 210 MWe GCR (Magnox), started construction in 1961 and operated from 1966 to 2006.
Sizewell A2, a 210 MWe GCR (Magnox), started construction in 1961 and operated from 1966 to 2006.
Operator: EDF Energy (Sizewell B) · Magnox (Sizewell A1, Sizewell A2).
Owner: EDF Energy Ltd (Sizewell B) · Nuclear Decommissioning Authority (United Kingdom) (Sizewell A1, Sizewell A2).