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Author: Kerstin Reisch

STOFF2 at GREENTECH FESTIVAL: With 14,000 visitors a complete success

On 16 and 17, The GREENTECH FESTIVAL took place at the Berlin exhibition grounds, where everything was about decarbonizing the economy. With an impressive 14,000 visitors, 200 exhibitors, and 350 speakers spread across 4 halls and 6 stages, the festival was a hotspot for innovation and sustainability. And in the middle of the story: STOFF2, present in the dynamic START-UP area.

A particular highlight was the visit of Dr. Franziska Brantner, Parliamentary State Secretary to the Federal Ministry of Economic Affairs and Climate Protection. She showed great interest in STOFF2’s innovative technology. 

“What is particularly new to this technology?” the Secretary of State asked. Sebastian Sipp, CEO of STOFF2, said: “The zinc intermediate step electrolysis allows energy storage and hydrogen production in one device. As a result, renewable energy can be stored if it is available in excess and inexpensive, which reduces the price for green hydrogen.

STOFF2’s participation in the GREENTECH FESTIVAL was a great success. The opportunity to present our innovative Zinc Zwischenschritt Electrolyzer (ZZE)to a wide and interested audience has shown us that the industry is ready for new technologies. We thank all visitors at our stand for their great interest and for their many valuable questions and suggestions. Thank you to everyone who contributed to making this event such an inspiring experience!

Implementation of §13k EnWG “Switchable loads” for the energy transition?

§13k in the EnWG was passed in the Bundestag in autumn 2023. This paragraph has the great potential to translate the economic benefits of sector coupling technologies into concrete investments. We are also committed to this. The core idea of the paragraph is to make otherwise curtailed renewable electricity usable for other sectors such as hydrogen.

With the current implementation proposal from the transmission system operators, only projects that will be built anyway will be able to tap into a small additional source of income. However, from our point of view no new projects are being constructed because of §13k. Therefore, the sector coupling technologies continue to remain far behind their potential. In our view, the proposed implementation contradicts the Bundestag’s intention in its decision last autumn, and we hope for a better implementation.

Here is our detailed positioning on the current debate.

EU Commissioner for Climate Protection Wopke Hoekstra visits STOFF2 – What a day!

“It’s very good to be back in Berlin,” says Wopke Hoekstra during his visit to the Urban Tech Republic | Berlin TXL last Friday. “What you are doing here is the future. I look forward to hearing about your experiences and what Europe can learn to provide the best possible support.” The overarching goal is clear: “We want to make Europe the first climate-neutral continent. “Fossil energies must finally become history,” said Hoekstra. “We work on that here every day,” confirmed Nora Oberlaender.

Our co-founder and advisory board member, Alexander Voigt presented the developments in HH2E’s large hydrogen projects in Lubmin and Tierbach. Christian Friebe explained how our innovative electrolyser will make green hydrogen significantly cheaper. Our first EU-funded field test in Alkmaar as part of the REFORMERS project also shows how our technology creates added value in a decentralised manner.

After a tour of the .GUT Am Flughafen 1 community, the EU Commissioner could directly experience our prototype and discuss it with our CTO, Andrew Zwinkels.

“Success depends on public and private collaboration.” This is the common conclusion after the exchange. We can only confirm this as a privately financed start-up with many tailwinds from public funding from BMBZ, BMWK and the EU. It also shows that, despite all the debates, the EU Commission is firmly behind the CO2 reduction targets. At the national level, politicians are now faced with translating the implementation of the RED3 targets to ramp up hydrogen into practice. Planning security is created primarily due to the stringent and binding EU policy. Particularly relevant for EU Commissioner Hökstra was Europe’s economic resilience and solid domestic industry in producing electrolysers and other climate protection technologies and infrastructure.

As a farewell, Hoekstra gave the .GUT Am Flughafen 1 community the following message: “There is only one group of people who are not enthusiastic about Germany: The Germans. I would encourage you to be proud of yourself!”

Thank you very much for the time you took for us and the Urban Tech Republic!

Launch Event – Innovations in the heart of Berlin

On March 21st we conducted a launch event in our office and workshop in the Urban Tech Republic in Berlin Tegel. Our new electrolyser with integrated storage function met with great interest of a total of 120 experts from all areas of the energy transition: project developers, energy suppliers, electricity and gas network operators, suppliers, and industry associations.

Dr. Severin Fischer, State Secretary in the Senate Department for Economic Affairs, Energy and Enterprises of the State of Berlin, warmly welcomed this diverse group of H2 enthusiasts. He particularly emphasised the need for innovation in the hydrogen sector and the advantages of Berlin as an innovative and high-tech location.

With this overview, Sara Sperling from Tegel Projekt GmbH impressively explained to all participants what a memorable place of transformation they celebrate the launch of our electrolyser. Something new is being built around the former Tegel Airport: a research and industrial park for urban technologies, the new residential area “Schumacher Quartier” and a landscape park.

Sebastian Sipp, Managing Director of STOFF2, then explained how our zinc intermediate-step electrolyser works in detail and how we will continue the path to market launch in 2026 with our partners and customers.

The challenges and opportunities of the energy transition in all sectors were discussed intensively in a panel discussion. Wolfram Axthelm from the German Renewable Energy Association (BEE) highlighted the central role in ramping up renewable energies. Renewable energies are the foundation for all further steps. Werner Diwald from the German Hydrogen Association (DWV) e.V. showed how the H2-projects and the H2-grid infrastructures must be planned and implemented in a coordinated approach. He also spoke about the high value of system-serving electrolysers. From Johannes Daum from the National Organization for Hydrogen and Fuel Cell Technology, NOW, the listeners learned a lot about the current uncertainty in the provision of public funding. This uncertainty can only be avoided if the ramp-up of hydrogen is organised independently of public funding by taxpayers. Quotas, i.e. legal obligations to use hydrogen instead of natural gas, can be an essential building block. According to Peter Müller-Baum, VDMA, stable framework conditions would allow Germany’s industry to create many high-quality, future-proof jobs and facilitate export opportunities.

The cozy part of the evening began, discussions continued, and new contacts were made with good food and drinks. At the same time, the participants were able to view our current prototype in small groups and get their own impression of the technology and his enthusiasm for the zinc intermediate electrolyser together with Andrew Zwinkels, founder, and technical director of STOFF2.

A big thank you to Nora Oberländer, Head of Business Development, for moderating the panel discussion, Katharina Krause for organizing the event, Timo Bovi for moderating and his many activities behind the scenes. It was a wonderful evening together, with lots of new impulses, a good exchange among H2 industry experts, and very tasty food in the Urban Tech Republic!

Position paper on the 37th BlmschV – An important step forward, open questions remain

Federal politicians are currently working on revising the 37th Federal Immission Control Act (BlmschGV). This amendment is expected to be passed in March 2024. This project sets several important steps for ramping up the hydrogen supply in Germany. But what exactly is it about?

A central point is the precise definition of green hydrogen. The 37th BlmschV implements the long-awaited EU Delegated Act from RED II national law and thereby describes how to implement the basic principles of “renewable energy”, “temporal correlation”, “geographical correlation” and “additionality” for our customers. Due to the integrated storage function of our ZZE technology, our electrolyser is particularly suitable for meeting these criteria today and in the future.

Another central point is recognising how green hydrogen can be counted towards meeting the transport sector’s greenhouse gas reduction quota. The transport sector must reduce its emissions yearly through a greenhouse gas reduction quota. With the reform of the 37th BlmschV, green hydrogen will be counted three times towards quota fulfilment, giving market development a big boost.The life cycle emissions must also be calculated to use green hydrogen in the transport sector. There is already another EU Delegated Act for this from RED II. These life cycle emissions include, for example, the transport of green hydrogen to the H2 filling station, which for safety reasons can only be done with diesel trucks, or the electricity consumption of the H2 filling station, e.g., in the compressors. We believe there is still a need for federal policymakers to take action. These details can significantly facilitate or hinder the ramp-up of the use of green H2 in mobility. More information can be found here (German only).

Project ZZE-GREEN-H2 started together with partners

Great things are happening in the Urban Tech Republic at the former Tegel Airport: All project partners met yesterday to kick off the ZZE-GREEN-H2 project. In addition to STOFF2, the Landshut University of Applied Sciences, the Technical University of Berlin, and the project sponsor Jülich joined in.

The project aims to further research and develop our zinc intermediate-step electrolysis technology regarding function, design parameters, industrial production, and scalability. Questions regarding cell, component and stack construction, scaling and the control of multiple stacks are worked on intensively together. The cell design will also be further developed based on previous work by the project partners. As a result, we aim to build a multi-stack test facility in the MWh range (concerning H2 storage capacity) and put it through its paces here in Tegel.

The project has a special meaning for STOFF2. We want to develop further the technological maturity level (TRL) of the zinc intermediate step electrolysis technology to TRL 7 and lay the foundation for series production. The STOFF2 project manager Stephan concludes from the day: “Many people involved in the project met in person for the first time today. We have planned the next steps together and already had many technical discussions. I’m looking forward to an intensive and successful project together!”

We thank the Federal Ministry for Economic Affairs and Climate Action for the financial support and look forward to working closely with our partners and the project sponsor.

RED3 – Clear framework from Brussels

Initiate the European transformation for green hydrogen with quotas

On October 18, 2023, the EU decided on the Renewable Energy Directive 3 (RED III), a framework for expanding and using renewable energies in all sectors. In addition to the goals for the expansion of renewable energies and renewable heat, the document also contains, among other things, uniform definitions and calculation methods for different renewable energies and measures to accelerate approval procedures. While the core goal is the rapid market uptake of renewable energies in all sectors, there are also limited interventions in biomass.

RED III also sets essential cornerstones for the ramp-up of renewable hydrogen. This includes, among other things, the basis for EU-wide trade in hydrogen via a proof of origin system. In addition, energy storage is classified as being of “overriding public interest” and can therefore be approved more quickly. RED III also announces that the EU Commission will review the agreed definition of green hydrogen in 2028 to enable a rapid ramp-up of green hydrogen.

Binding targets for individual sectors, which are intended to provide orientation and planning security for all actors along the value chain, are crucial for the ramp-up:

  • The industry should cover its hydrogen needs by 42% green hydrogen and its derivative products by 2030 at the latest and 60% by 2035. As a result, green hydrogen will replace grey hydrogen based on fossil fuels and reduce carbon emissions.
  • At least 29% renewable energy should be used in the transport sector by 2030. A sub-quota of at least 1% applies to green hydrogen and its derivative products.
  • Ships should use at least 1.2% green hydrogen or derivative products in 2030.
  • The use of hydrogen in backup power plants is explicitly welcomed.

RED III creates demand for at least 30 TWh of green hydrogen in Germany in 2030. This will support the implementation of the German National Hydrogen Strategy that targets 95 to 130 TWh hydrogen in 2030 (including blue hydrogen).

It is now up to the German federal government to translate the binding framework of RED III into national laws that enable investment decisions for the required and necessary ramp-up of green hydrogen. One approach is a GHG reduction quota mechanism, which has been used in the transport sector. With a mandatory, ever-increasing quota, users are obliged to reduce CO2 emissions and switch to renewable energies gradually. The users themselves bear the costs without any burden for the taxpayers. Such a mechanism ensures the green hydrogen ramp-up. It also leads to FIDs (final investment decisions i.e., binding investment decisions) being made quickly for H2 projects along the entire value chain – from renewable energies to H2 use.

STOFF2 can benefit from the national implementation of RED III like no other actor. Our “Zinc-Zwischenschritt Electrolyzer” with integrated storage function allows us to use green electricity when available and cheap and simultaneously provide green hydrogen to the gas network or directly to the H2 customer as required.

Important milestone for STOFF2: zinc intermediate step electrolysis becomes part of the EU-funded REFORMERS project 

  • STOFF2 is leading technology provider and part of a consortium of 28 companies, public and scientific organisations from ten European countries 
  • From November 2023, a hydrogen hub is designed and built in the Dutch region of Alkmaar to supply 3,000 households and 300 businesses with 100 per cent renewable energy 
  • A STOFF2 electrolyzer with an integrated energy storage capacity of 2 MWh will produce green hydrogen from end of 2025 
  • The innovative Zinc Zwischenschritt Electrolyzer (ZZE), charges power at times of high PV and wind feed-in and ensures a demand-orientated and cost-efficient supply of green hydrogen 
  • For the first time, a STOFF2 electrolyzer is being integrated into a wider energy system and can bring its specific advantages to bear under real conditions 

Berlin, 24 November 2023: STOFF2 is part of the REFORMERS project, which aims to create a so-called Renewable Energy Valley in the Boekelermeer industrial estate of the city of Alkmaar. REFORMERS stands for “Regional Ecosystems FOR Multiple-Energy Resilient Systems” and is a sub-project of the EU-wide Horizon Europe funding program. STOFF2 is part of a consortium of 28 partners including companies as well as public and scientific institutions from a total of ten European countries. REFORMERS is coordinated by the Free University of Brussels, started in November 2023 and has a total duration of five years. The project is funded by the European Union with a total of around 22.5 million euros. 

A total of twelve partner organisations are building several interconnected and interacting demonstration plants under the coordination of the New Energy Coalition (NEC). The aim is to build and operate a 100 per cent climate-neutral supply system from renewable energies that will provide a constant and secure supply to 3,000 households and 300 local businesses. The energy carrier, green hydrogen, plays a key role in ensuring security of supply with green energy that is available and affordable at all times: STOFF2’s ZZE technology will be part of a local “Hydrogen Hub” that connects producers and consumers of green hydrogen via dedicated pipelines, storage facilities and a “docking station”, thus making fossil fuels superfluous. The STOFF2 zinc intermediate step electrolyzer will have a hydrogen output capacity of 2 Megawatt-hours and is expected to be operational by the end of 2025. 

The high relevance of this project is also emphasised by the fact that the Alkmaar region, like more and more regions in Germany, is affected by electricity grid bottlenecks, meaning that wind and solar power often have to be curtailed. Some operators of wind farms and PV systems even have to pay penalties for the surplus electricity they generate. It therefore makes all the more sense that, as part of the REFORMERS project, the green hydrogen produced is supplied to fuel cell vehicles via the local hydrogen refueling station that is already in operation and can also be fed into the H2 pipeline network. 

Sebastian Sipp, Managing Director of STOFF2: “We are delighted that our technology has not only convinced our project partners, but also the decision-makers at EU level. This is an important milestone for us, as this is the first time we can demonstrate the advantages of our product in a concrete application under real market conditions. Especially in an electricity grid with a growing share of solar and wind energy generation, the Zinc Zwischenschritt Electrolyzer can produce green hydrogen safely, cost-effectively and in line with demand. Our entire team is looking forward to this exciting international project and the funding decision marks an important milestone towards the launch of our GIGAfactory.” 

In this context, our energy storage electrolyzer can fully utilise its specific advantages: It contributes to the production of green hydrogen which is temporally decoupled from the power charging phase, which has a positive effect on the load balance in the electricity grid. In addition, the integrated storage function of the ZZE helps to make the green hydrogen available to consumers in the “Hydrogen Hub” in line with demand, thereby keeping system costs low. At the same time, 4-6 hours of electricity consumption per day during the periods of most intensive solar and wind power generation are sufficient to produce enough hydrogen, which can then be used for 12-24 hours per day as required. 

Further information can be found at 

Background information 

STOFF2 GmbH, based in Berlin, is developing a new type of electrolyzer with an integrated energy storage function, the Zinc Intermediate Electrolyzer (ZZE), a highly innovative technology for securing a 100% supply of renewable energies beyond the electricity sector and for producing renewable hydrogen in Europe: safe, cost-effective and green. 

ZZE has the combined functionality of a battery and an electrolyzer and serves as a cost-effective energy storage system to decarbonise hard-to-deplete sectors with green hydrogen. Our ZZE charges electricity for four hours during the day when the sun is shining or the wind is blowing (and electricity prices are low) and produces safe, cheap and green hydrogen over a cycle of 12 to 24 hours, providing customers with a continuous supply of green hydrogen and enabling a carbon-neutral energy supply without carbon emissions. 

STOFF2 was founded in 2020 and has grown steadily since then. STOFF2 currently has 20 employees. 

Press contact: 

BRight Advisors for STOFF2: 
Timo Bovi 
Phone: +49 177 8860622 

“Use instead of curtailment” is becoming a legal principle

Sector coupling, and the use of green hydrogen are receiving an important boost – the STOFF2 technology is perfect for this 

On November 10, 2023, the German Bundestag decided to introduce paragraph 13k in the Energiewirtschaftsgesetz (EnWG). “Use instead of curtailment” becomes the requirement when it comes to renewable electricity that cannot be used due to a lack of sufficient grid capacity or low demand for electricity. What does “use instead of curtailment” mean specifically, and what positive effects does this principle have? 

In recent years, the costs of renewable electricity volumes, which are inevitably curtailed by grid operators, have risen massively. In 2022, costs totaling more than 10 billion euros were incurred for renewable energy curtailment and the so-called redispatch, which had to be covered by the federal budget. Redispatch is the name given to switching on coal or gas power plants, particularly in southern and western Germany, when there is a large supply of wind and solar power available which cannot be transported there due to a lack of sufficient grid capacity. The wind farms and PV systems are then switched off, even though there is sufficient demand for electricity, and their operators receive corresponding compensation for their outage. At the same time, electricity from gas and coal-fired power plants must also be compensated. The German Bundestag has now decided on a regulation that will stop the further increase in the costs of unused green electricity and at the same time enable an additional contribution to the ramp-up of the hydrogen economy and climate protection: The new paragraph 13k of the EnWG stipulates that from October 2024 curtailed renewable electricity can be used by highly flexible electricity consumers with a connected load of at least 500 kW through a newly established auction mechanism. Highly flexible and therefore network-friendly systems can absorb this otherwise curtailed energy and use it to convert it for example into green hydrogen. 

STOFF2 welcomes the new regulation decided by the Bundestag. The new paragraph 13k of the EnWG now ushers in a turning point in dealing with renewable electricity quantities that would otherwise be curtailed: instead of leaving them unused in an economically inefficient manner, they will accelerate sector coupling in the future. The use of renewable electricity in the form of green molecules is becoming an equivalent option. The green hydrogen economy will receive an important additional boost. This means that the amounts of electricity that were previously “thrown away” can now be used – for example in the form of green hydrogen from the Zink Zwischenschritt Elektrolyzer (ZZE) from STOFF2. The ZZE technology is technically and economically ideally suited for the use of electricity that would otherwise have to be curtailed: four to six hours of absorption of “curtailed current” enable continuous hydrogen release for up to 20 hours. In this way, a ZZE can generate and provide green hydrogen particularly cost-effectively and in line with demand. The new paragraph 13k enables our customers to use this quality even more intensively.

Our perspective on advocacy

Our innovative electrolysis technology, the Zinc Zwischenschritt Elektrolyzer (ZZE), can become a decisive building block for the rapid implementation of the political targets for CO2 reduction in all sectors. Together with other technologies, we enable the integration of high shares of fluctuating renewable energies and rapid decarbonisation, especially of all application areas whose direct electrification is complicated, cost-intensive or cannot be implemented quickly enough. At the same time, the right political framework is required so that our customers and partners invest in our systems and thus in the transformation of the energy supply.

As a company, we want to work with our customers to make the greatest possible contribution to the use of renewable energies in all sectors. That is why we consciously engage in regular exchanges with political actors. We are convinced that by transparently communicating our positions we can help shape the political discourse and contribute valuable information to support democratic decision-making processes.

We would like to contribute independently and together with other actors from science, industry and civil society to the process of political decision-making. Our advocacy focuses on three areas of action:

  1. rapid expansion of renewable energies in the form of renewable electricity, renewable gases such as hydrogen and green heat. 
  2. comprehensive removal of barriers to the expansion of renewable energies, hydrogen and sustainable grid infrastructures.
  3. increased and accelerated use of green hydrogen in all sectors that are not yet on a 1.5°C compatible decarbonisation path.

Our position papers and statements can be found here on the website under the filter “Policy”. Furthermore, we document our lobbying in the official register of the German Bundestag

If you would like to talk to us, please feel free to speak to Dr. Christian Friebe directly.