Stargate Hydrogen has secured a €20.6 million EU Innovation Fund grant to expand its electrolyser manufacturing operation in Tallinn, increasing European production capacity across alkaline electrodes, pressurised stacks and complete hydrogen systems.
The Estonian manufacturer has signed the grant agreement with the European Climate, Infrastructure and Environment Executive Agency, with the additional factory capacity due to be introduced in phases. Once complete, the expansion is planned to provide annual production capacity of 250MW for electrodes, 150MW for pressurised alkaline stacks and 66MW for complete electrolyser systems.
Those figures represent different stages of the production chain rather than a single headline factory capacity. Electrodes feed stack manufacture, while complete electrolyser systems combine stacks with power electronics, controls, cooling, water treatment and other balance-of-plant equipment needed to turn electrical input into an operating industrial hydrogen installation.
Building capacity at all three levels gives Stargate greater control over how its core electrochemistry is translated into finished equipment. It also allows electrode and stack output to support customers or projects that do not necessarily purchase a complete Stargate system.
The company’s technology is based on alkaline electrolysis, but its manufacturing proposition centres on a ceramic-based catalyst intended to replace precious metals traditionally used in parts of the electrochemical process. Stargate argues that the approach can reduce exposure to imported critical raw materials while supporting industrial hydrogen production at larger scale.
That materials question matters because the economics of an electrolyser extend beyond nominal electrical efficiency. Catalyst cost, stack life, manufacturing yield, replacement intervals and maintenance all influence the capital and operating cost of hydrogen production, particularly where a project is expected to operate for many years.
The Innovation Fund project is also intended to support European supply-chain resilience. Electrolysers are treated as strategic clean technologies under EU industrial policy, yet manufacturers are expanding into a market in which many announced hydrogen projects have not yet reached final investment decision.
That creates an awkward timing problem. Equipment producers need enough manufacturing capacity to supply large projects when orders arrive, but building too far ahead of committed demand can leave expensive factories underused. Stargate’s phased approach gives it a route to add capacity progressively rather than assuming that every proposed European hydrogen project proceeds to schedule.
The company expects the expanded operation to serve large Power-to-X developments, including green ammonia, synthetic natural gas and sustainable aviation fuel. Those applications can require electrolyser installations measured in tens or hundreds of megawatts, making repeat stack production and factory testing more important than the bespoke engineering model associated with early demonstration projects.
Industrial-scale electrolysis also places greater pressure on quality control. Small deviations in electrode coating, stack assembly or sealing can become costly when multiplied across large numbers of repeat units. Higher throughput therefore has to be accompanied by manufacturing discipline if additional capacity is to reduce project risk rather than increase the volume of equipment requiring rework.
Stargate says the grant-supported project is expected to create around 150 direct high-value jobs and support additional activity across construction, logistics, maintenance and the wider supply chain. It also estimates that equipment produced through the programme could contribute to avoiding around three million tonnes of carbon dioxide equivalent during the first ten years, although that figure depends on the resulting electrolysers being deployed and operated in the applications assumed by the company.
The expansion follows earlier investment in Stargate’s Tallinn manufacturing base and comes after a Series A financing round that included Repsol and Estonia’s SmartCap. The company has supplied equipment to customers including Fortum, Utilitas, ABB and Rockfin and has delivered systems into several European and international markets.
Operational references will matter as manufacturing scales. A larger factory can produce more stacks, but industrial users will judge the technology on availability, degradation, maintenance requirements and the cost of hydrogen delivered over the working life of the plant.
That means factory expansion and field performance have to advance together. Data from operating systems can feed back into electrode design, stack assembly and test procedures, while production improvements should make replacement parts and additional modules easier to supply as the installed base grows.
The European hydrogen market remains exposed to electricity prices, grid constraints, financing costs and uncertainty over the premium customers will accept for low-carbon hydrogen. Those factors sit outside Stargate’s factory but will determine how heavily its expanded lines are used.
The €20.6 million grant therefore removes one constraint without settling the market. Stargate will have the ability to manufacture substantially more electrodes, stacks and systems in Tallinn; the next test is whether European industrial hydrogen projects convert that capacity into repeat orders and sustained factory utilisation.
