Estonia's Elcogen signs solid oxide MoU with China's Hygreen Energy: Baltic deeptech goes global
Tallinn-based Elcogen has signed an MoU with Beijing's Hygreen Energy to bring its solid oxide stacks into a Chinese electrolyser OEM's global portfolio, with MW-scale demonstrators targeted within two years. We look at what was actually signed, how an Estonian cell maker became an export story, and why Chinese integrators are now shopping for European core technology.
NEWS
PtXBaltic
11/6/20266 min read
A Chinese electrolyser manufacturer with more than 300 projects behind it has decided that the solid oxide stacks it wants to sell worldwide should come from a factory on the outskirts of Tallinn. That is the short version of the Memorandum of Understanding Elcogen and Hygreen Energy signed on 14 October 2026 and made public this week. The longer version is a useful marker of how far Baltic deeptech has travelled in a few years, and of a quiet reversal in who buys core hydrogen technology from whom.
What was signed, and what was not
Elcogen, headquartered in Tallinn with R&D in Estonia and Finland, makes the ceramic cells, stacks and modules at the heart of solid oxide electrolysers (SOEC) and solid oxide fuel cells (SOFC). Hygreen Energy, based in Beijing, sells complete alkaline, PEM and AEM electrolysis systems to developers and EPCs. Under the MoU, Hygreen intends to add SOEC and SOFC systems built around Elcogen stacks to that line-up, aimed at both the Chinese and wider international markets.
The technical plan is explicit: accelerate development and testing of both SOFC and SOEC systems, moving from laboratory scale towards MW-class demonstration units over the next two years. Alongside that, the two companies say they will assess "deeper commercial arrangements", naming localised manufacturing and product supply as the options on the table.
It is worth being precise about what this is. An MoU is a statement of intent, not a supply contract. No capacity figures, volumes or capital commitments have been published, and "localised manufacturing" is a topic to be assessed, not a decision. Baltic hydrogen ecosystem stakeholders should read it as a strong signal of direction, with the binding steps still ahead.
From 10 MW to 360 MW: how a Tallinn cell maker became exportable
The reason a company like Hygreen can even consider sourcing stacks from Estonia is that Elcogen has spent the last two years turning itself from a technology developer into a manufacturer. In September 2025 it opened ELCO I, a 14,000 m² plant near Tallinn that lifted its production capacity from roughly 10 MW to 360 MW a year. The build cost about €50 million, funded by shareholders including Baker Hughes and HD Hyundai, with a further €24.9 million from the EU Innovation Fund. Elcogen has described a pathway from there towards multi-gigawatt scale, and has said it intends to license the factory model to partners abroad while keeping control of the intellectual property.
The product side moved in step. In May 2026 Elcogen launched its second-generation elcoStack E3000 G2 platform, designed for mass manufacture and operating in both fuel cell and electrolysis modes. In SOEC mode the company quotes an electricity consumption of around 33 kWh per kilogram of hydrogen, which sits well below the figures typically cited for alkaline and PEM systems. That is the company's own number rather than an independently verified one, but it is the kind of number that gets a Chinese OEM's commercial team on a plane.
Put the factory and the product together and you have something the Baltic region has rarely had in the hydrogen space: a locally made core component that global system builders want to design around.
Four Asian deals in eight months
Hygreen is not Elcogen's first Chinese partner this year, and the sequence matters because it shows a repeatable commercial model rather than a one-off. In March 2026 Elcogen signed an MoU in Shanghai with Shanghai HyEnergy, a solid oxide system integrator spun out of the Chinese Academy of Sciences; by September the two had signed supply agreements for the first MW-level projects in China, and the HyEnergy executive team had visited Tallinn in between. In August, in Paris, Elcogen signed a non-exclusive MoU with Guangzhou Xinzhili Energy Technology, a company within the China Southern Power Grid group, to develop solid oxide products for the Chinese market and promote them globally. Earlier in the year it signed its first Indian MoU, with the EPC contractor JNK India, on waste-heat applications.
Hygreen is the fourth and, in portfolio terms, the most interesting: the other three are solid oxide specialists or power-sector players, while Hygreen is a mainstream electrolyser OEM adding a technology it does not currently make. The pattern in all four is the same. Elcogen supplies cells and stacks; the partner handles system integration, local engineering and market access. Elcogen's leadership has been open that this is the model it wants everywhere.
Why a Chinese OEM is shopping in Europe
The usual story about China and electrolysers is one of overcapacity and price pressure flowing outward. Hygreen's recent moves tell a different story about the stack layer. The company, which rebranded from Beijing SinoHy Energy in 2024 to pursue international markets, told Hydrogen Insight in May 2026 that it is refocusing overseas because its home market has become overcrowded. In 2024 it announced plans for a 5 GW alkaline electrolyser factory in Málaga as part of a stated €2 billion European expansion, a plan that, as far as we can tell from public sources, remains at the announcement stage. In July 2025 it agreed to build its PEM systems above 1 MW around Bosch's Hybrion stacks rather than its own.
Now it is doing the same for solid oxide with Elcogen. The logic is consistent: Hygreen's strength is system engineering, project delivery and a large installed base, and it would rather buy a proven European stack than spend years developing one. For an OEM trying to sell into European and other Western markets where local content, IP provenance and compliance standards increasingly matter, a European-made core component is also a commercial asset in its own right.
That flips a narrative Baltic hydrogen ecosystem stakeholders will recognise. The region has spent years discussing how to absorb cheap Chinese electrolysers into local projects. Here, the flow runs the other way: the Chinese integrator is the customer, and the Estonian factory is the supplier of the part that is hard to make.
The part that is hard to make
Solid oxide electrolysis runs at 700 to 850 °C and splits steam rather than liquid water. Because part of the energy input can come as heat, it needs materially less electricity per kilogram than low-temperature electrolysis, which is why it keeps surfacing in Power-to-X designs where waste heat is available: e-fuel synthesis, green ammonia and methanol, steel and refinery hydrogen. The catch has always been durability and manufacturing yield of the ceramic cells, and that is exactly the know-how that sits in a handful of companies globally. Elcogen is one of them, and ELCO I is one of the few places in Europe producing at industrial volume.
That is why the Hygreen MoU reads as more than a distribution deal. Hygreen is not licensing a brochure; it is building a product line around a component it cannot readily source at home. The two-year lab-to-MW roadmap is, in effect, Hygreen learning to integrate Elcogen stacks the way it learned to integrate Bosch's.
What it means for the Baltic hydrogen ecosystem
Baltic hydrogen conversations tend to run on import logic: where will the electrolysers come from, who will finance the project, which German offtaker will sign. Elcogen's year is a reminder that the region also has export-grade deeptech, and that deeptech is now being validated by customers in the world's largest electrolyser market. For Baltic project developers, a scaled stack supplier two hours up the road is also a practical advantage when SOEC-based e-fuel and ammonia concepts move from feasibility to FEED.
There is a second lesson in how Elcogen got here. The company stacked private strategic capital, an EU Innovation Fund grant and a national base in Estonia, then used that platform to sign partners in China, India and Korea rather than waiting for European demand to arrive. That is a model other Baltic hydrogen and PtX technology companies can study closely, including the compression, storage and system-integration players in the PtXBaltic project database.
What to take from it
The MoU is non-binding, and the numbers that would make it bankable have not been published. What is already real is the direction of travel: an Estonian manufacturer with 360 MW of solid oxide capacity has, within eight months, lined up a Chinese integrator, a China Southern Power Grid company, an Indian EPC and now a global electrolyser OEM, all of them designing around its stacks. For Baltic hydrogen ecosystem stakeholders the watch-list is simple. First MW-class demonstrator with Hygreen inside two years. Any move from "assessing" to signing on localised manufacturing. And whether Hygreen's SOEC line shows up in European tenders with Tallinn-made stacks inside it. If it does, the Baltic region will have gone from hydrogen technology importer to supplier of the hard part, which is a better place to be.