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Output over the last 7 days
About Sizewell B
Sizewell B is a nuclear power station near Leiston in Suffolk. It was commissioned in 1995. It has one pressurised water reactor (PWR) driving two turbine generators.
Its 1,287 MW of registered generating capacity is spread across 2 balancing mechanism units. Every half hour each unit tells the grid how much it will generate (its physical notification): that is the live figure above, and GridMonkey records it every half hour for the chart.
Nuclear stations run flat out for months at a time, so their output changes little from hour to hour, until a reactor stops for refuelling or repairs.
| Type | Nuclear |
|---|---|
| Registered capacity | 1,287 MW |
| Commissioned | 1995 (DUKES 5.11) |
| Area | Suffolk |
| Location | Near Leiston in Suffolk 52.215° N, 1.620° E |
| Owner or operator | EDF |
| Elexon lead party | EDF Energy Nuclear Generation |
| BM units | T_SIZB-1 657 MW, T_SIZB-2 630 MW |
| Size | 3rd largest of the 5 nuclear power stations on GridMonkey's list |
Other nuclear power stations
- Torness 1,352 MW, East Lothian
- Heysham 2 1,336 MW, Lancashire
- Hartlepool 1,240 MW, County Durham
- Heysham 1 1,195 MW, Lancashire
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Contains BMRS data © Elexon Limited copyright and database right 2026 (licence). Station names, areas and owners or operators come from GridMonkey's own table, matched to the units in Elexon's register; a station's output here is its physical notification, not metered generation. Year commissioned and location: Power stations in the United Kingdom (DUKES 5.11) (Department for Energy Security and Net Zero, May 2026). Contains public sector information licensed under the Open Government Licence v3.0.