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HYFLEXPOWER: The world’s first integrated power-to-X-to-power hydrogen gas turbine demonstrator

A world’s first: Industrial-scale power-to-X-to-power demonstrator 

Through its Horizon 2020 framework program the European Commission supports highly innovative research and demonstration projects aiming at developing and creating innovative products and services and thus stimulating growth in Europe. For this, the European Commission is awarding grants in a competitive procedure in which HYFLEXPOWER was able to assert itself against a large number of competitors.
With this particular project, HYFLEXPOWER will demonstrate that renewable hydrogen can serve as a flexible means of storing energy which can then be used to power a high-power industrial turbine.  
Storing fluctuating renewable energy is one of the major challenges of the energy transition. In this context, the stakeholders involved in the HYFLEXPOWER project are developing new technologies which can be used across the whole power-to-X-to-power1 cycle. The installed demonstrator will be used to store excess renewable electricity in the form of green hydrogen. During periods of high demand this stored green hydrogen will then be used to generate electrical energy to be fed into the grid.

The purpose of HYFLEXPOWER is to prove that hydrogen can be produced and stored from renewable electricity and then added with up to 100 percent to the natural gas currently used with combined heat and power plants.

Engie Solutions has been entrusted with producing energy at the Smurfit Kappa site in Saillat-sur-Vienne, France. At the site, Engie Solutions operates a 12 MWe combined heat and power facility which produces steam for the manufacturing company's requirements. The conversion of an existing infrastructure has the advantage of significantly lower costs and minimized lead time compared to a greenfield site. The project will develop and demonstrate an advanced plant concept that will contribute to modernizing and improving the factory's existing power plant. 
During two demonstration campaigns, the facility will be powered by a mix of natural gas and hydrogen, ultimately aiming for up to 100 percent hydrogen operation. In this regard, the overall goal of the HYFLEXPOWER project is to test an entirely green hydrogen-based power supply for a completely carbon-free energy mix. This would save up to 65,000 tons of CO2 per year for a SGT-400 at baseload operation.

An exclusively European technology

The consortium selected following the call for proposals is made up exclusively of European companies and bodies. Each stakeholder's role is defined as follows:

  • Engie Solutions will build the hydrogen production and storage facility, including the natural gas/hydrogen mixing station prior to the turbine
  • Siemens Gas and Power will supply the electrolyser for hydrogen production and develop the hydrogen gas turbine
  • Centrax will upgrade the package for hydrogen operation and install the new turbine 
  • German Aerospace Center (DLR) together with the University College London, University of Duisburg-Essen and Lund University will support the hydrogen turbine technology development
  • National Technical University of Athens will perform economic, environmental and social assessments of the concept
  • Arttic will support the operational project management and the project’s communication activities.

The project's total budget is close to €15.2 million, of which €10.5 million will be contributed entirely by the European Union under the Horizon 2020 program.
Officially launched on 1 May 2020, the project will last 4 years and will be split into several phases:
  • May 2020: Contract finalization and start of engineering development.
  • 2021: Installation of the hydrogen production, storage and supply facility at pilot demonstration site.
  • 2022: Installation of the gas turbine for natural gas/hydrogen mixtures and initial demonstration of advanced pilot plant concept. 
  • 2023: Pilot demonstration with up to 100 percent hydrogen for carbon-free energy production from stored excess renewable energy.
This extremely promising technology is fully in line with Siemens, Engie Solutions and Centrax’ strategy of providing its clients with zero-carbon solutions. 

As part of a consortium, Siemens Energy will upgrade an existing SGT-400 industrial gas turbine to generate electricity and thermal energy with stored hydrogen and demonstrate an industrial-scale power-to-H2-to-power solution.

Siemens Gas and Power helping to increase level of decarbonization

Siemens Gas and Power is helping its customers achieve their decarbonization goals by building infrastructure for power-to-X-to-power1 and making a global contribution to cross-sector decarbonization. Siemens offers all core technologies for a long-term CO2-free energy supply, from power and heat generation, to power transmission and distribution, and efficient electrolysis for hydrogen production.
“Siemens Gas and Power wants to be the driving force behind the decarbonization of energy systems worldwide,” says Karim Amin, CEO of the Generation Division of Siemens Gas and Power. “Our goal is to make our gas turbines usable for 100 percent hydrogen. With that, our gas turbines can be the “technology of choice” for our customers to complement the intermittence of renewables and ensure a secure energy supply in the decarbonized world of the future,” Amin added. 

Engie Solutions, a stakeholder committed to hydrogen

As an energy for the future, green hydrogen has a major role to play in the energy transition. For Engie Solutions, the most abundant element in the universe is vital to decarbonizing industrial processes. 
Engie Solutions is certain that this energy will help speed up the transition of regions and manufacturing companies and is supporting the development of renewable hydrogen – it already has a number of projects, either in operation or forthcoming. 
"With the HYFLEXPOWER project, Engie Solutions is once again demonstrating its intent to support manufacturers and regions as they seek to optimize and green their energy use. Developing renewable hydrogen for industrial purposes is a perfect example. This demonstrator is the future,” says Pierre Hardouin, CEO of Engie Solutions for Industries. 

Centrax Ltd. developing Hydrogen ready solutions

Centrax sees Green Hydrogen as an important part of the path to a decarbonized energy system and welcomes the considerable investment being made by the Horizon 2020 program to assist the development of Hydrogen compatible combustion systems.
“Our goal is for our gas turbine combined heat and power systems to be ‘Hydrogen Ready’ to provide future proof power generation solutions for our Customers,” says Harry Trump, Director of Business Development for Centrax Ltd..

According to the ADEME (France's agency for environment and energy management), “Power to X” (or “P2X”) is the act of converting electricity into another energy vector. For the HYFLEXPOWER project, the “X” vector is hydrogen.

The project's partners: 

The project's partners
For further information on Siemens Gas and Power, please see
For further information on Power-to-X, please see
Siemens Gas and Power GmbH & Co. KG is the global energy business of the Siemens group, which has been working with its customers on solutions for the evolving demands of industry and society for more than 150 years. With planned stock listing, Siemens’ energy business will operate independently as Siemens Energy in the future. It will offer broad expertise across the entire energy value chain, along with a comprehensive portfolio for utilities, independent power producers, transmission system operators, the oil and gas industry, and other energy-intensive industries. With its products, solutions, systems, and services, Siemens Energy will address the extraction, processing, and transport of oil and gas as well as power and heat generation in central and distributed thermal power plants, and power transmission and technologies for the energy transformation, including storage and sector-coupling solutions. The majority stake in Siemens Gamesa Renewable Energy will round out its future-oriented portfolio. With its commitment to leading the way in decarbonization of the global energy system, Siemens Energy will be a partner of choice for companies, governments, and customers on their path to a more sustainable future. With around 90,000 employees worldwide, Siemens Energy will help shape the energy systems of today and tomorrow.
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ENGIE Solutions supports towns, industries and companies in the tertiary sector, providing them with solutions to the challenges posed by the energy transition in the form of turnkey and bespoke packages. ENGIE Solutions’ experts apply all their expertise in pursuit of three aims: optimising the use of energy and resources, greening energies and reinventing living and working environments. ENGIE Solutions guarantees its clients a single point of contact and a combination of complementary offerings that go beyond energy. The company is committed to achieving results and its 50,000 employees which operate throughout France (900 sites) have expertise in an extremely diverse number of areas, ranging from the design and operation of infrastructure & services, to funding, installation and maintenance.
ENGIE Solutions is part of the ENGIE Group, one of the world's leading low-carbon energy and services groups whose aim is to become the leader in the zero-carbon transition. Sales: €10 billion. To find out more, visit

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Centrax Gas Turbines specialises in the manufacture and service of gas turbine-powered generator sets ranging from 3MW to 15MW that use core engines from Siemens. The generator sets are used mainly for combined heat and power but also in base load, simple cycle and standby applications. It is a global company with a broad customer base throughout the world. Visit our website for more information

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Alfons Benzinger

Siemens Gas and Power GmbH & Co. KG

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Lise Forest

Engie Solutions

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Maureen Palfrey

Centrax Ltd.

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