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HYdrogen as a FLEXible energy storage for a fully renewable European POWER system

Project description

First demonstration of an integrated power-to-hydrogen-to-power plant

Generating renewable electricity is an important way to reduce CO2 emissions and tackle climate change. However, sources of renewable energy such as wind and solar suffer from supply and demand imbalances. Energy storage in the form of hydrogen could provide a remedy for this problem: excess renewable electricity is fed into an electrolyser to split water into oxygen and hydrogen. The green hydrogen is stored and subsequently used in gas turbines to produce electricity when needed, releasing the stored energy back to the grid. The EU-funded HYFLEXPOWER project will develop and operate the first fully integrated power-to-hydrogen-to-power industrial scale power plant, including an advanced dry-low emissions hydrogen gas turbine. The already installed SGT-400 gas turbine package will be upgraded with the ultimate goal to produce 12 MW electrical energy using fuel mixtures that contain up to 100 % hydrogen.


Clean, reliable and secure energy supply is a key requirement for the further development of the European economy. At the same time, the Paris Agreement and its aim to limit the global warming to well below 2°C call for a quick and significant reduction of CO2 emissions, including the energy sector. In the energy sector this can only be achieved by a significant increase of the share of renewable energy sources (RES). As the most abundant RES, wind and solar, are intermittent by nature, there is a need for energy storage technologies, to provide back-up power when wind and solar output are low and more generally for load levelling and grid stabilisation.
Chemical storage appears to be the most promising long-term energy storage technology. Among chemical storage technologies, hydrogen is expected to dominate as it can be produced by electrolysis of water using excess energy from RES, easily compressed and stored, and finally re-electrified using gas turbines.
The goal of HYFLEXPOWER is the first-ever demonstration (at TRL7) of a fully integrated power-to-H2-to-power industrial scale installation in a real-world power plant application. The project will update and enhance an existing power plant within an industrial facility in Saillat-sur-Vienne, France. It will include the integration of energy conversion (power-to-H2) in the demonstration plant using excess energy from RES and necessary storage capabilities. The Siemens SGT-400 gas turbine will be upgraded to operate with different natural gas / H2 fuel mixtures. A key objective is the operation at full load and production of 12 MW electrical energy with high-hydrogen fuel mixtures of at least 80% by volume H2 up to 100%. The tests will also demonstrate that EU emission limits for such installations can be not only met, but also reduced. Finally, the development of an economic assessment for this Power-to-H2-to-Power pilot plant demonstration will be conducted to show the economic benefits of this application.

Call for proposal


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Sub call



Net EU contribution
€ 3 926 369,63
Otto-hahn-ring 6
81739 Munchen

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Bayern Oberbayern München, Kreisfreie Stadt
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Other funding
€ 2 468 444,12

Participants (15)