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Green Hydrogen Certification | TÜV Rheinland

Green hydrogen certification.

TÜV Rheinland Standard H2.21: An independent verification for the documentation of carbon-neutral hydrogen.

The demand for green hydrogen in the industry is increasing worldwide. At TÜV Rheinland, we are providing active support for the development of hydrogen as an energy carrier of the future. We are now offering to the industry, market players and interested parties a new practice-oriented specification for the certification of green hydrogen: the TÜV Rheinland Standard H2.21 Carbon-Neutral Hydrogen.

It allows you as a manufacturer, distributor and user of carbon-neutral hydrogen to document its environmentally friendly production, whereby strengthening the confidence of your customers in your actions and securing an advantage over your competitors.

Key for demonstrating the carbon neutrality of hydrogen is the Product Carbon Footprint (PCF) within the hydrogen supply chain. In our TÜV Rheinland Standard H2.21, our experts have specified requirements that allow a certification of the PCF as less than or equal to zero. In addition, based on the "Carbon-Neutral Hydrogen” certification, by fulfilling other specific criteria, the following optional additional criteria can be certified as well: Green Hydrogen, Blue Hydrogen, Turquoise Hydrogen, RED II compliant Hydrogen. This enables our customers to verify several climate-friendly aspects with the same certification.

You can download the TÜV Rheinland standard H2.21 Carbon-Neutral Hydrogen here .

What is included in a certification and how is procedure?

Along the entire hydrogen supply chain, there are opportunities to keep CO2 levels low and to compensate for them. That's why our certification looks at the production process from the beginning all the way to your individual delivery point. Any and all

  • Production methods (e. g. electrolysis, steam reforming, chlor-alkali process, etc.),
  • Transport methods (e. g. gas networks/pipelines, hydrogen tanks, etc.)
  • Applications of hydrogen (e. g. powering mobility, low-CO2 production in the industry, generation of electricity and heat, etc.).

can be balanced and certified. It is also possible to certify only individual parts of the supply chain. Remaining CO2 loads can be neutralized through direct or indirect compensation measures. We coordinate your individual needs and requirements with you as part of a requirement analysis.

Regardless of the life cycle stage of the hydrogen (production, distribution, use) – with our certification for carbon-neutral hydrogen, you provide evidence that you, as the owner, are supplying the hydrogen to the recipient in a climate-neutral manner. Request a requirement analysis.

Benefit from our certification.

With the certification of a carbon-friendly production of hydrogen, you transparently and independently document that an energy supply with environmentally friendly products is possible. At the same time, you communicate your company's sustainability strategy to the outside world, whereby sending environmentally friendly signals and demonstrating your contribution to a sustainable energy supply. This not only provides you with a competitive edge, but also strengthens the trust of your customers and business partners.


pdf Bringing Clean Hydrogen to Life, Safely – a sustainable pathway for the energy transition 618 KB Download

Create transparency – with our test mark for carbon-neutral hydrogen.

test mark green hydrogen

Upon successful certification, we will present you with our personal certificate and with the right to use our test mark. The "key words" in our test mark document the test contents of the certification and make them transparent to everyone. Depending on the key components of the audit, we award the test mark with the following key words:

Carbon-Neutral Hydrogen and Periodic Surveillance: Upon successful certification and re-certification, certificate and test mark are issued with the key words "Carbon-Neutral Hydrogen" and "Regular Surveillance".

Green Hydrogen: If the carbon-neutral hydrogen is produced by electrolysis of water and if the electricity used for this electrolysis comes exclusively from renewable energies, the key word "Green Hydrogen" is awarded in addition.

Blue Hydrogen: If the CO2 produced during the production of the hydrogen is captured and stored (Carbon Capture and Storage/ CCS), the additional key word "Blue Hydrogen" is awarded.

Turquoise Hydrogen: If the hydrogen is produced by methane pyrolysis and if the resulting carbon can be permanently fixed, the keyword "Turquoise Hydrogen" is awarded in addition.

RED II Compliant Hydrogen: If, in addition to the specifications for carbon-neutral hydrogen, the additionally applicable criteria of the Renewable Energy Directive (Version II) are also met, the keyword "RED II Compliant Hydrogen" is awarded in addition.

What is the difference between "Green", "Blue" and “Turquoise” hydrogen?

On an industrial scale, hydrogen can be produced using various methods. Depending on the method of production and also on the handling of the resulting CO2 emissions, the hydrogen is assigned different colors. The "Hydrogen Color Theory" by the German Federal Ministry of Education and Research (BMBF) distinguishes between gray (conventional), green, blue and turquoise hydrogen.

Green hydrogen is produced by electrolysis of water. This process uses only electricity from renewable energy sources such as wind and solar energy. Regardless of the electrolysis technology used, the pure production of green hydrogen is CO2-free, because the electricity for the process comes exclusively from renewable sources. This production method is therefore climate-neutral.

Grey hydrogen is produced from fossil fuels, for example by steam reforming. This process releases CO2 into the atmosphere, contributing to the greenhouse effect. However, if the CO2 produced is captured and permanently stored (carbon capture and storage/ CCS), this is referred to as blue hydrogen. The CO2 produced this way is therefore not released into the atmosphere, and the hydrogen production is considered climate-neutral.

Turquoise hydrogen is hydrogen produced by thermally splitting methane (methane pyrolysis). Instead of CO2, solid carbon is produced in the process. For this process to be CO2-neutral, the heat supply of the high-temperature reactor must come from renewable energy sources and the resulting carbon must be permanently captured.

The role of Green Hydrogen in our energy system

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