Assystem and DORIS announce new collaboration to support the development of low-carbon hydrogen

July 10, 2023

The two engineering companies are working together to develop the low-carbon hydrogen sector and offshore electrical networks.

Assystem, an international engineering, digital services and project management company, and DORIS, an international engineering, consulting and project management company specialising in the field of energy, have signed a collaboration agreement aimed at associating their respective expertise in the low-carbon hydrogen and offshore power grid sectors.

This agreement was formalised at the Résidence de France in Riyadh, Saudi Arabia, on July 8 in the presence of Agnès Pannier-Runacher, Minister for Energy Transition, and Ludovic Pouille, Ambassador of France to Saudi Arabia.

Developing sustainable energy solutions to meet current environmental challenges is more necessary than ever. While electrification is now a priority on a global scale, hydrogen has become a promising alternative to achieve the objectives of decarbonisation and reduction of greenhouse gas emissions. By combining their complementary skills, Assystem and DORIS wish to strengthen their contribution to this crucial energy transition around the world.

Assystem and DORIS have been in discussions since 2021 and have already obtained a first major contract in France for a low-carbon hydrogen plant project. The two companies have also worked together on the development of offshore electrical substations to connect wind farms in France.

These first collaborations made it possible to identify strong synergies between the two companies. By combining Assystem’s expertise in engineering, digital technology and the management of complex projects in the field of electricity with DORIS’ in-depth experience in process engineering and its unique knowledge of offshore, this enhanced collaboration will enable to offer innovative and tailor-made solutions to meet the specific needs of customers in these rapidly developing sectors. The two companies will pool their expertise to provide complete integrated engineering services from the design phases to the implementation of projects.

We are delighted to formalise this strategic partnership with DORIS,” said Thomas Branche, Executive Vice-President – France, Nuclear & Energy New Build. “We are at the dawn of considerable investment in the energy transition. By joining forces, we will be able to provide effective solutions in the fields of low-carbon hydrogen and offshore electricity networks, thus contributing to the acceleration of the energy transition and the fight against climate change.”

Christophe Sarri, CCO of DORIS said: “The partnership between DORIS and Assystem reflects the commitment of both companies to energy transition and innovation. Together, they will bring advanced technical expertise, strong project management and state-of-the-art digital solutions to address the development and challenges of low-carbon hydrogen and offshore power grids.”

Agnès Pannier-Runacher, French Minister for Energy Transition, said: “I welcome the signing of this partnership between these two French companies committed to decarbonization and low-carbon hydrogen. It is with this spirit of “Team France” that we must move forward together.”

This strategic partnership is perfectly in line with the visit of the Minister for Energy Transition, focused on decarbonisation in compliance with the objective of reducing greenhouse gas emissions set by the Paris Agreement on CIimate” added Ludovic Pouille, Ambassador of France to the Kingdom of Saudi Arabia. “It comes in an extremely favourable context for relations between France and Saudi Arabia, following the historic visit to France of HRH Crown Prince Mohammed Bin Salman. It will make it possible to better seize the opportunities offered in the Kingdom in the field of low-carbon hydrogen”.


Assystem, one of the world’s leading independent nuclear engineering companies, is committed to accelerating the energy transition. With more than 55 years of experience in highly regulated sectors with stringent safety and security constraints, the Group provides engineering services as well as digital solutions and services to optimise the performance of complex infrastructure assets throughout their life cycle.

In its 12 countries of operation, Assystem’s 6,500 experts are supporting energy transition. To achieve an affordable low carbon energy supply, Assystem is committed to the development of low carbon electricity (nuclear, renewables and electricity grids) and clean hydrogen. The Group is also helping drive the use of low carbon electricity in industrial sectors such as transportation. 

Assystem is currently ranked in the top three nuclear engineering companies in the world.

For more information please visit

Follow Assystem on Twitter: @Assystem @AssystemUK


DORIS is a leader in providing engineering, consulting and project management services for the energy industry. DORIS has nearly 60 years of experience in supporting customers around the world in sectors such as conventional energies and the reduction of their CO2 emissions, offshore wind, hydrogen and carbon capture and storage. DORIS provides its customers with reliable, environmentally friendly and innovative solutions.

DORIS offers a full range of services to support energy projects from their conceptual phases through to execution. Independent, DORIS works in close collaboration with its customers to understand their needs, develop solutions that meet their requirements and support them in the successful completion of their projects.

For more information, you can consult:


Jack Dobson-Smith
External Communications Specialist
+44 7879 115 255

Olivier Benyessaad
Vice President Business Development
+33 6 29 61 51 71



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