As technology of the future, Fusion Power could transform global electricity production by 2050 with the potential for abundant energy using a sustainable fuel source which does not impact the environment.

Fusion power is currently the subject of some of the most ambitions research and development (R&D) programmes in the world, resulting in numerous global experiments.

Faced with major development prospects, the teams at Assystem are actively contributing to international fusion power projects. Today, we are convinced that a future powered by fusion is within reach.

The key challenge for fusion power will be transitioning from the research stage to production, and in turn to commercialisation. The commercial success of fusion power would meet the increasing global energy demand while combatting CO2 emissions.

Fusion has the potential to provide the world with abundant, low-carbon energy. It will help mitigate climate change, it will provide careers for our children and grandchildren, it will make electricity and heat more affordable and, of course, it will be clean and sustainable.
Stéphane Aubarbier Assystem CEO


As a dedicated partner in the development of low-carbon technologies, Assystem is positioned as an engineering leader, committed to the development of fusion power for nearly 20 years.

Since 2005, we have provided engineering services for the ITER project, the world’s largest experimental fusion reactor. Initially in charge of project management assignments, we have since won two major engineering contracts as architect-engineer as part of the ENGAGE consortium and the Momentum joint venture which will manage the assembly of the ITER reactor components. Assystem’s teams are also working on the completion of a Divertor Remote Handling System (DRHS) for ITER to maintain the reactor.

In the United Kingdom, as the preferred supplier in the Engineering Design Services (EDS) framework contract for the United Kingdom Atomic Energy Authority (UKAEA), we are contributing to engineering work to support the STEP (Spherical Tokamak for Energy Production) programme. This project aims to prove the commercial viability of fusion power in the United Kingdom. Our teams are working with the UKAEA on fusion power research projects, including the design of electric power plants, robotics, modelling, equipment, and other specialised technical areas.

In 2021, in collaboration with the Institute of Mechanical Engineers, a report titled “Fusion Energy: A global effort, a UK opportunity”, was released, assessing the opportunities linked to the progress of fusion technologies in the UK and throughout the world.

Click here to read the report (in English only)


  • Project management
  • Engineering: studies and design
  • Field operation management: procurement, supply chain management and construction supervision
  • Testing/Commissioning
  • Industrial control systems
  • Compliance, quality, risk, and safety studies
  • Digital twins and simulation

Learn more about our EngineeringDigital and Project Management activities.

Our references in fusion

4D BIM for the holistic integration cell of the Tokamak complex

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Concept design for the STEP fusion tokamak

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Design and construction management for a cryogenic plant on ITER site

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