ST40
tokamak United Kingdom
ST40 is a tokamak fusion device run by Tokamak Energy in United Kingdom. It is operating. Like every fusion device built so far, it has produced no net electricity.
What it has actually demonstrated
Reached 100 million °C plasma ion temperature in March 2022, in a compact spherical tokamak.
A privately built spherical tokamak that hit the temperature threshold for commercial fusion conditions in a machine far smaller than the national programmes.
Project
| Organisation | Tokamak Energy |
|---|---|
| Approach | tokamak |
| Confinement | magnetic |
| Country | United Kingdom |
| Status | Operating |
| First plasma | 2018 |
Targets
| Target date | none stated |
|---|---|
| Power target | none stated |
| Energy gain target | none stated |
| Net electricity | No. no fusion device has produced any |
Other tokamak projects
Fusion needs tritium, and the world's civilian stock comes mostly from CANDU fission reactors. See the fusion overview.
Sources
- World Nuclear Association, Nuclear Fusion Power · retrieved 2026-09-07