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Fusion, the nuclear reaction that powers the Sun and the stars, is a potential source of safe, non-carbon emitting and virtually limitless energy. Harnessing fusion's power is the goal of ITER, which has been designed as the key experimental step between today's fusion research machines and tomorrow's fusion power plants.


One million components, ten million parts ... the ITER Tokamak will be the largest and most powerful fusion device in the world. Designed to produce 500 MW of fusion power for 50 MW of input heating power (a power amplification ratio of 10), it will take its place in history as the first fusion device to create net energy.

Visualization courtesy of Jamison Daniel / Oak Ridge Leadership Computing Facility

35 countries, 35 years

ITER Members China, the European Union (through Euratom), India, Japan, Korea, Russia and the United States have entered into a 35-year collaboration to build and operate the ITER device. A two-decade research program is planned during which the Members will share in the experimental results and in any generated intellectual property.


ITER construction is underway now. On the ITER site, the ITER machine is taking shape as machine and plant components are delivered from factories on three continents. Approximately 2,500 workers are currently participating in on-site building, assembly and installation activities.

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