The alkaline water electrolysis stacks from Thyssenkrupp Nucera AG & Co. KGaA - modular megawatt blocks for green hydrogen plants

Reviewed: ad hoc news Bestseller & Flagship desk. Edited and checked on 2026-06-23, 00:33. Details in the imprint.

The alkaline water electrolysis stacks from Thyssenkrupp Nucera AG & Co. KGaA sit inside bright white containers, humming quietly while thin hydrogen bubbles stream past the electrodes. For engineers on site, these steel-framed modules feel less like lab gear and more like heavy-duty industrial engines for green molecules.

Built for multi?megawatt plants

Each alkaline water electrolysis stack is designed as a standardized module that plant builders can combine into systems from around 20 megawatts up to 700 megawatts and beyond, depending on project needs. According to the company, these stacks draw on decades of chlor-alkali experience that Thyssenkrupp has transferred into large-scale hydrogen projects. The official product overview for hydrogen electrolysis describes alkaline modules tailored for industrial demand.

In practice, that means thick flanges, robust piping interfaces and frames that can be lifted by standard plant cranes without babying the equipment. Project engineers like Nucera chief technology officer Dr. Christoph Noeres emphasize that customers want predictable, repeatable building blocks rather than bespoke one-offs for every project.

Efficiency and durability focus

The alkaline water electrolysis stacks are specified to reach electrical efficiencies typically in the mid-60-percent range based on the lower heating value of hydrogen, depending on operating conditions and system integration. The company highlights long cell lifetimes and stable performance curves as key selling points for developers planning 20-year project horizons. This aligns with descriptions in a capital markets day presentation on large-scale alkaline electrolysis.

Inside the stack, operators see a tidy sandwich of electrodes and diaphragms held between thick end plates, with process gas channels routed to the plant pipe racks. During commissioning, the warm, slightly caustic electrolyte smell in the container reminds technicians that, despite the clean energy label, this is still hard industrial chemistry.

Where the stacks show up

The alkaline water electrolysis stacks form the heart of several high-profile hydrogen projects, including reference plants in Europe and the Middle East where multi-hundred megawatt installations are planned. Nucera positions the technology particularly for ammonia, steel and refinery applications that need large, steady hydrogen volumes. Industry coverage of these projects in outlets such as Reuters reports on Thyssenkrupp Nucera's project pipeline has underlined the focus on big industrial clients.

In steelmaking, that means the stacks feed direct-reduced iron plants that are swapping natural gas for green hydrogen. In refineries, they replace grey hydrogen units step by step, allowing operators to trim scope 1 emissions without redesigning entire process trains.

Standard modules, tailored projects

On paper, the alkaline water electrolysis stacks are standardized products, but no two plants look the same when project manager Julia Krause walks customers through a layout. The same 20-megawatt building block can sit in a coastal ammonia export terminal or on a windy plain next to a gigawatt-scale wind farm.

The modular cube approach is meant to keep engineering hours under control while still allowing project-specific cooling, power electronics and gas treatment to be adapted. For developers, that reduces the risk that a small design decision at stack level triggers long delays further down the engineering chain.

What operators have to manage

For operators, the alkaline water electrolysis stacks do not run on autopilot. They need careful electrolyte management, water treatment and gas purity monitoring to keep efficiency consistent over years. Service teams train plant staff to watch key process values and react before deviations hurt performance.

During a site visit, the subtle vibration of pumps and the soft hiss of gas lines remind visitors that the neat block on the 3D drawing is a living chemical plant in reality. The stacks reward disciplined operation with long running hours, but punishment for sloppy maintenance can be harsh in the form of increased downtime.

Green hydrogen economics in mind

Because the alkaline water electrolysis stacks typically account for a significant share of capex in a green hydrogen project, Nucera spends time on cost curves and learning effects when talking to investors. Higher factory output and design refinements are supposed to push module costs down over time.

At the same time, project developers are watching how fast the company can ramp production to meet tender deadlines. CEO Dr. Werner Ponikwar regularly underlines that disciplined project execution and reliable delivery of stack modules are as important as flashy efficiency numbers on slides.

Context and share reference

Thyssenkrupp Nucera, headquartered in Dortmund, markets its alkaline water electrolysis stacks globally as a centerpiece of large-scale green hydrogen infrastructure and has built a project pipeline that spans several continents. ThyssenKrupp Nucera shares (ISIN DE000NCA0001) trade in Frankfurt, giving investors direct exposure to this electrolysis hardware business.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.