Green hydrogen production

Green hydrogen (H₂) is a versatile energy carrier that can be applied to decarbonize a wide range of sectors. It can be used directly or in the form of its derivatives like e-Methanol, e-Ammonia, or e-Fuels to replace fossil fuels like coal or gas.
Only around 40% of global carbon dioxide (CO₂) emissions originate from power generation which can be decarbonized via electrification. The other 60% of CO₂ emissions originate from industry, mobility, buildings and others. These can be decarbonized via sector coupling, using green hydrogen and its derivatives to make renewable energy available to those sectors. This is why the production of sustainable hydrogen is so important for the energy transition.

Discover the new name of our electrolysis portfolio by watching the video!

Elyzer is designed for industrial-scale applications of renewable hydrogen in both industry and mobility sectors.

With our product, Elyzer P-300, we emphasize our innovative strength and commitment to scaling the hydrogen economy within the energy transition. The "P" denotes Proton Exchange Membrane technology.

Our proven solutions remain unchanged, supporting efficient production of green hydrogen.

With our new name, we strengthen our position as a leading provider in this important field and invite you to become part of the hydrogen revolution.

Generating green hydrogen efficiently from water and renewable energy requires high-end technology and innovative solutions — like our electrolyzer product family from Siemens Energy. Using Proton Exchange Membrane (PEM) electrolysis, our electrolyzer is ideally suited for harnessing volatile energy generated from wind and solar. Combining high efficiency and high power density, our PEM electrolyzers ensure gas products of superior quality. It is easy to operate and requires low maintenance. Using a modular design strategy that splits the electrolysis system into skids, we are able to optimize costs, reduce installation costs, and make the electrolysis system transportable.

Shows electrolyzer at Trailblazer project in Oberhausen

Carbon emission targets in the European Union and other industrialized countries will require massive scaling-up and acceleration of renewable hydrogen production and imports.

That’s why we have joined forces with Air Liquide to create a joint venture dedicated to the series production of industrial-scale renewable hydrogen electrolyzers. In 2023, we started production of electrolysis stacks at our multi-gigawatt electrolyzer facility in Berlin and will ramp up the production. The factory will supply stacks to Siemens Energy and Air Liquide for our broad range of customers and serve the rapidly growing market.

We can offer comprehensive services for your electrolyzer plant and energy assets along the entire hydrogen value chain. Our service agreements range from basic maintenance to premium service with state-of-the-art data analysis and can be customized to your needs.
Our combined package of maintenance, support and digital services can ensure reliable and economical operation. You can reduce your risks with our performance guarantees or enjoy total peace of mind with our operations and maintenance service program. Together, we will push your clean hydrogen production to the next level.

Overview of Siemens Energy's services for the production of green hydrogen

PEM electrolyzer plant in Normand’Hy, France, to produce hydrogen for industry and mobility

54 MW PEM electrolyzer project at BASF’s Ludwigshafen site for hydrogen production and CO2 emission reduction in chemical industry

Our 20 MW electrolyzer project in Oberhausen with two people in front of stacks

Our 6 MW electrolyzer plant in Austria for the production of hydrogen for the steel industry

In PEM water electrolysis, water is split into its molecules, oxygen and hydrogen. This requires a PEM membrane as well as an anode and a cathode

Our Proton Exchange Membrane (PEM), simply explained, splits water into its molecules hydrogen and oxygen using an electric current. The PEM membrane serves as barrier between the two electrodes and allows the protons to pass through while preventing the mixing of the gases, facilitating the separation and collection of the hydrogen and oxygen gases.

PEM water electrolysis is an important technology for the production of hydrogen as a clean and sustainable source, as it provides a way to generate hydrogen gas using renewable electricity and water, without producing greenhouse gas emissions.

With our extensive knowledge of industrial, mobility, and energy sectors, we’re able to provide dependable solutions for our customers in every aspect of green hydrogen production.

You will benefit from Siemens Energy’s decades of experience, global footprint, infrastructure, strong partnerships and manpower available, covering the full energy value chain from renewable power via transmission to hydrogen and Power-to-X production. Moreover, we can help you certify the source of green energy with CertaLink certification.

Are you ready for the green hydrogen economy? We are and we look forward to being your partner for sustainable hydrogen generation.

Our Haru Oni project represents our Power to X technology for a carbon-free world

Cover image of a white paper on the economic feasibility, key markets, and applications of e Ammonia in global Power to X strategies.

Our Kasso project in Denmark shows the advantages of e Methanol in the shipping industry

Integrated electrolyzer and heat pump system for efficient hydrogen and heat production from waste heat

Hybrid power solutions for decarbonizing independent energy supply and ensuring cost-effective, accessible power.

ESD focuses on cost-effective decarbonization for sustainable energy system transformation

Green hydrogen as a CO2-free energy carrier is essential for Power-to-X solutions and decarbonization efforts.

It is not inherently more dangerous than other fuel sources. Hydrogen is flammable and must be handled with care, just like other flammable fuels. To ignite, the hydrogen must be combined with an additional oxidizing agent (air, pure oxygen, chlorine, etc.) in a specific concentration and an ignition source (a spark). If, in a worst-case scenario, the hydrogen ignites, it burns upwards very quickly. It creates no dangerous heat radiation above the accident site, as petrol or kerosene do.

The facilities are designed to be permanently leak proof. Flange connections are designed especially for hydrogen and the number of detachable connections are minimized. Furthermore, in buildings a steady air exchange is ensured and the facilities are equipped with safety valves and pressure reliefs. Additionally explosion prevention zones are designated. In these zones, electrical and other equipment needs to be in accordance with 2014/34/EU (ATEX Directive).

Electrolysis processes can be categorized as follows: alkaline electrolysis with liquid alkaline electrolytes, acidic electrolysis with a solid polymer electrolyte (as PEM) and high temperature electrolysis with a solid oxide as electrolyte.

PEM electrolysis and alkaline electrolysis systems are available at an industrial scale. The solid oxide electrolysis technology is in an early development phase.

Hydrogen enables the long-term storage of large quantities of surplus renewable energy. It is allows new ways to use green electricity, i.e. by using hydrogen as substitute for natural gas by feeding it into existing pipelines, as fuel for fuel-cell vehicles or power plants, or as feedstock for the hydrogen processing industry. It opens the possibility to connect energy generation with the industry and mobility sectors, the so called “sector coupling”.

‘Green’ hydrogen is sourced by 100% renewable energy. That means that the needed energy to produce hydrogen by electrolysis has emitted zero emissions. Hydrogen produced from fossil fuels releasing emissions such as CO₂, may be referred to as ‘grey’ or ‘brown’ hydrogen. If the emitted carbon dioxide is captured, stored (carbon capture storage) and re-used, it is often called ‘blue’ hydrogen.

Green hydrogen production

Decarbonizing through green hydrogen

A new name for our electrolyzer family

Our electrolyzer portfolio: the optimum solution for large-scale sustainable hydrogen production

Scaling up the capacity of green hydrogen production

Your service partner for green hydrogen production and beyond

Our electrolyzer systems in the field

EWE | Clean Hydrogen Coastline | Germany

Air Liquide Normand'Hy | France

BASF | Hy4Chem-EI | Germany

Air Liquide Trailblazer | Germany

H2 Future | Germany

Understanding the process of PEM water electrolysis

Your partner for sustainable hydrogen production

Green solutions: white papers on green hydrogen

Power-to-X: on the way to a carbon-free world

Power-to-X: a closer look at e-Ammonia

e-Methanol: a universal green fuel

Related topics

FAQ – The most common questions on hydrogen

Green hydrogen production

Decarbonizing through green hydrogen

Our electrolyzer portfolio: the optimum solution for large-scale sustainable hydrogen production

Scaling up the capacity of green hydrogen production

Your service partner for green hydrogen production and beyond

Our electrolyzer systems in the field

EWE | Clean Hydrogen Coastline | Germany

Air Liquide Normand'Hy | France

BASF | Hy4Chem-EI | Germany

Air Liquide Trailblazer | Germany

H2 Future | Germany

Understanding the process of PEM water electrolysis

Your partner for sustainable hydrogen production

Green solutions: white papers on green hydrogen

Related topics

FAQ – The most common questions on hydrogen

What is hydrogen?

Is hydrogen a rare element?

At what temperature does hydrogen gas turn liquid?

What is the energy density of hydrogen compared to conventional fuels?

How can the energy stored in hydrogen be used?

Do we have enough experience in the production and use of hydrogen?

How can hydrogen be produced?

Which processes exist today for producing hydrogen?

How can hydrogen be stored?

Why is the compression or liquefaction of hydrogen needed?

What pressures are common in compressed gas storage?

How can hydrogen be transported?

Is hydrogen toxic or poisonous?

How dangerous is the use of hydrogen?

What is being done to prevent the formation of an explosive hydrogen-air mixture?

Is it true that hydrogen cannot be stored safely?

What are the dangers regarding a hydrogen gas leak?

How does electrolysis work?

What kind of electrolysis systems exist?

What does PEM stand for?

What are the differences between the electrolysis systems?

What are the benefits of PEM electrolysis systems?

How much water is needed for PEM electrolysis?

How much energy is necessary to produce 1kg of hydrogen with electrolysis?

In which sectors is hydrogen used in particular?

What possible industry applications exist for hydrogen today?

How much hydrogen is required to drive 100km with a medium sized car?

How long does it take to refuel a fuel cell electric vehicle?

What are the specific advantages of combining electricity from renewable energies and hydrogen?

Is hydrogen only a temporary solution?

What are the main components of the energy mix for hydrogen production?

What are the so called ‘green’, ‘grey/brown’ and ‘blue’ hydrogens?