United Kingdom · 54.418, -3.492Calder Hall
Calder Hall, nuclear power plant in United Kingdom, operated 5 gas-cooled reactors between 1956 and 2003 and is now shut down.
It is United Kingdom's oldest nuclear plant, operating since 1956.
- Country
- United Kingdom
- Units
- 5
- Technology
- GCR
- Net capacity
- —
- First grid connection
- 1956
- Operator
- Sellafield · United Kingdom Atomic Energy Authority
- Owner
- Nuclear Decommissioning Authority (United Kingdom) · United Kingdom Atomic Energy Authority
- Status
- Shut down
See also: alerts for this plant · every plant in United Kingdom · Vendor: UK Atomic Energy Authority · every GCR reactor · how a GCR works
Units
| Unit | Type | Model | Status | MWe | MWt | Construction start | Grid connection | Closure | Load factor |
|---|---|---|---|---|---|---|---|---|---|
| Calder Hall 1 | Gas-cooled (GCR / AGR) | Magnox | Shut down | 50 | 268 | Aug 1953 | Aug 1956 | Mar 2003 | — |
| Calder Hall 2 | Gas-cooled (GCR / AGR) | Magnox | Shut down | 50 | 268 | Aug 1953 | Feb 1957 | Mar 2003 | — |
| Calder Hall 3 | Gas-cooled (GCR / AGR) | Magnox | Shut down | 50 | 268 | Aug 1955 | Mar 1958 | Mar 2003 | — |
| Calder Hall 4 | Gas-cooled (GCR / AGR) | Magnox | Shut down | 50 | 268 | Aug 1955 | Apr 1959 | Mar 2003 | — |
| Windscale AGR | Gas-cooled (GCR / AGR) | AGR | Shut down | 24 | 120 | Nov 1958 | Feb 1963 | Apr 1981 | — |
Data: IAEA PRIS · Global Energy Monitor · Wikipedia · updated on Sep 17, 2026
Calder Hall 1, a 50 MWe GCR (Magnox), started construction in 1953 and operated from 1956 to 2003.
Calder Hall 2, a 50 MWe GCR (Magnox), started construction in 1953 and operated from 1957 to 2003.
Calder Hall 3, a 50 MWe GCR (Magnox), started construction in 1955 and operated from 1958 to 2003.
Calder Hall 4, a 50 MWe GCR (Magnox), started construction in 1955 and operated from 1959 to 2003.
Windscale AGR, a 24 MWe GCR (AGR), started construction in 1958 and operated from 1963 to 1981.
Operator: Sellafield (Calder Hall 1, Calder Hall 2, Calder Hall 3, Calder Hall 4) · United Kingdom Atomic Energy Authority (Windscale AGR).
Owner: Nuclear Decommissioning Authority (United Kingdom) (Calder Hall 1, Calder Hall 2, Calder Hall 3, Calder Hall 4).