Due to their strong dependence on fossil hydrocarbons, more than 80 % of the EU’s greenhouse gas emissions are related to the energy, transport and process industry sectors.

Whether as fuel or as feedstock green hydrogen has the potential as a substitute for fossil hydrocarbons and to reduce CO2 emissions at the same time. Therefore, the production and use of green hydrogen supports the EU’s roadmap for a low-carbon economy by enabling the future scenarios of decarbonised energy and feedstock supply as well as decarbonised mobility.

Whereas GrInHy’s vision is the production of green hydrogen based on electricity from renewable energy sources, e.g. wind or solar energy, the project emphasizes on the successful implementation of a reversible high-temperature electrolyzer in a relevant industrial environment meeting the quality criteria of an integrated iron and steel works. The potential of green hydrogen will be covered by the simulation of fluctuating electricity supply and project-accompanying Life Cycle Assessment (LCA).

There are already national and institutional standards on green hydrogen in place that are dealing with the definition of green hydrogen. Those standards mostly differ in their particular system boundaries and qualification levels. One example is the TÜV SÜD Standard CMS 70 „Generation of green hydrogen (GreenHydrogen)“. However, the use of waste heat to overcome part of the energy need to split water in hydrogen and oxygen has not been evaluated. Part of the project will be a suggestion for a supplementation to existing standards.

As long as there is no EU wide standard, green hydrogen – in the context of the GrInHy project – will be defined as follows:

Green hydrogen is hydrogen produced from renewable energy sources as defined in the Renewable Energy Directive (2009/28/EC, Article 2) and/or waste heat via an electrolysis process.