The world’s largest tokamak project
ITER is an international scientific project in France, whose aim is to demonstrate the scientific and technological feasibility of fusion energy.
Reference section on an independent scientific project. ITER Platform is not ITER Organization; this information does not imply the platform’s or its clients’ participation in funding ITER.
34
Participating countries · as of 2026
7
Parties to the international agreement
150 million °C
Target plasma temperature
500 MW
Target fusion power · Q = 10
23,000 tonnes
Tokamak design mass
Cadarache
Location — southern France
500 MW — the project’s thermal reaction power, not electricity production and not financial return.
Key project milestones
- 2006
Signing of the agreement
Seven parties signed the international agreement to establish and jointly implement ITER.
- 2010
Start of construction
Construction of the scientific complex began in Cadarache, in southern France.
- 2020
Start of tokamak assembly
The assembly phase of the main components of the experimental facility began.
- 2034
Research operations (planned)
Target start of research operations under the updated baseline plan.
- 2039
Deuterium-tritium operations (planned)
Planned start of deuterium-tritium fuel operations. Planned dates may change.
Sources: ITER — about the project and schedule · ITER construction. The figures and plans belong to the scientific project, not to this platform.
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