Click on the icons to explore the hydrogen value chain and our Silyzer 300

Industry Use Case

About 90 percent of the more than 600 billion cubic meters of hydrogen produced annually worldwide is used by industry. Hydrogen is an essential feedstock in industry that serves as fuel, additive, or reduction agent. Hydrogen is primarily used as a basis for the synthesis of ammonia and other fertilizers such as urea, and for the synthesis of methanol, various polymers, and resins. Other major consumers in today’s hydrogen industry include refineries and the metalworking industry, as well as the semiconductor, glass, and food and beverage industries.

Did you know that 7% of global CO2 emissions are emitted by steel production? With the H2Future-Project, we and our partners are performing pioneering work to reduce this.



The principle of electrolysis is that water is split into its components hydrogen and oxygen by means of electric current. In contrast to conventional production methods, electrolysis offers a more environmentally friendly technology for producing CO2-neutral hydrogen. Here you can distinguish between different electrolysis systems. Hydrogen Solutions has its core competences in the field of PEM electrolysis. PEM is the abbreviation for proton exchange membrane, which is a crucial part of the electrolysis cell of the PEM electrolyzer.The membrane separates the anode, where the oxygen is collected, and the cathode, where the hydrogen gas is generated. This results in advantages in terms of power density and service life, but it also guarantees high gas purity, dynamic availabilty and efficiency.

SILYZER Plant - More Information
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SILYZER 300 - More Information


Transforms power from high or medium voltage to electrolyzer voltage.


Converts alternating (AC) into direct current (DC).

PEM Elektrolyzer

The Siemens SILYZER 300 produces hydrogen (and oxygen) by splitting demineralized water using DC power.

Cooling System

Dissipates heat from the PEM modules via the external coolant.

Feed Water Treatment

Produces demineralized water for the electrolysis process.

Control System

The Siemens SIMATIC control system enables full control of the entire electrolysis plant.

Gas Cleaning and Drying

Dries the hydrogen product gas and removes remaining oxygen molecules.


Compresses the hydrogen product gas to the pressure required by the customer.


Stores the hydrogen for further utilization.

Transport and Distribution

The hydrogen can either be connected to an H2 pipeline, could be directly fed into the natural gas grid or transported via trailer.



The next paradigm of PEM electrolysis

Module Array with 24 modules

PEM Cell

Splits demineralized water into hydrogen and oxygen, using Siemens manufactured PEM cells.

PEM Module

A full Module Array consists of 24 PEM modules each consisting of several PEM cells.

Gas Separator

Separates liquid and gas phase and recycles the water into the demin water loop.

H2/O2 Piping

Routes demineralized water and gases through the PEM module array, using natural circulation - no additional pumps needed.

Heat Exchanger

Cools the demineralized water back to the required PEM module input temperature.

Gas Cooler

Cools down the hydrogen before transfering it to product gas management.

Cell Voltage Monitoring

Enables measuring of the voltage of each PEM electrolysis cell.

17.5 MW
per full Module Array
(24 modules)
75 %
System efficiency
(higher heating value)
340 kg
hydrogen per hour per full Module Array
(24 modules)
Rotate product
Rotate product

Renewable Energy

Greenhouse gases include carbon dioxide (CO2) and methane (CH4). Emissions of these gases are generated primarily when fossil fuels such as coal, oil and natural gas are burned. The goal of the Paris Climate Agreement is to set ambitious climate targets for every nation - a decarbonisation of the global economy. In order to meet the demands, the steady expansion of renewable energies as well as the integration into existing infrastructure of the industry, energy and mobility sector is necessary. But what happens to the excess wind and solar energy? Hydrogen enables large amounts of it to be stored long-term. We generate "green" hydrogen from renewable energy sources via PEM electrolysis and thus make an important contribution to the worldwide energy transition. Did you know that we can also offer a holistic value chain for Power-to-Gas?


Power Transmission

Various factors will dominate the electricity transmission market over the next few years. An important trend is the steadily growing share of renewable energies in the energy mix. In addition, the expansion of the network infrastructure and the closer coupling of the networks with each other will play an important role. To maintain a stable system and avoid grid fluctuations it is necessary to compensate for the integration of fluctuating renewable energy. Electrolysis is especially useful here because of its ability to regulate output in real time. In addition to electrolysis, we are solution providers in the field of energy management. Whether transformers, rectifiers, or an intelligent network solution, Siemens is able to offer a holistic solution.


Mobility Use Case

The electrification of mobility is one of the greatest challenges in global decarbonization. Hydrogen can help to decarbonize this in two ways. Fuel cell vehicles can use hydrogen directly. Instead of CO2 and NOx, they only emit water vapor. Together with battery-powered vehicles, they not only reduce emissions from local urban traffic but also from interurban traffic and light- and heavy­duty transport, because these vehicles have a significantly higher range than that of exclusively battery-powered vehicles – plus it only takes a few minutes to refuel.
To strengthen our sustainable portfolio, Siemens develops innovative fuel cell solutions for mobility hand in hand with our partners.

The second way hydrogen can help is through the synthesis of hydrocarbons from sustainable hydrogen and carbon from agriculture and forestry. In this way, even large ships, heavy-duty vehicles or plains, requiring liquid fuels, can be decarbonized.


Energy Use Case

Only a small percentage of hydrogen is currently used in the energy sector, even though hydrogen is considered one of the most promising technologies in the large­scale integration of renewable energy. The more electricity is generated from fluctuating renewable sources such as sun and wind and the less reliance there is on conventional power utilities, the more important it is that energy systems change. Ultimately, renewably generated power must also be available at times when sun and wind are scarce. This requires storing energy, often even over extended periods of time. Hydrogen plays a key role as an energy source and storage medium. One example of a suitable infrastructure would be gas grids with their tremendous storage potential.

"Island solutions" can also be implemented using a hydrogen infrastructure. The highly dynamic behavior of a PEM electrolysis system is particularly suitable for direct connection to renewable power sources. Load peaks can thus be countered in the island grid and the energy can be fed back into gas turbines or fuel cells as needed.
Siemens also offers solutions for re-electrification of hydrogen within the gas turbine portfolio.