While many sectors can decarbonize through direct electrification, heavy industries like steel, cement, heavy transport, and shipping face a tougher road. These sectors require high-temperature processes or dense energy carriers that electricity alone can’t provide. Green hydrogen, produced using renewable energy, offers a viable path forward. But its widespread adoption has been held back by cost. The key global challenge now is: how do we make green hydrogen affordable and scalable – especially when it’s needed most to decarbonize the industries that can’t go green without it?

In response to this challenge, Stiesdal Hydrogen has developed a 3.1 MW electrolyzer, designed for dynamic operation, capable of adjusting its hydrogen production based on fluctuating electricity prices. During periods of low spot prices, the electrolyzer efficiently converts surplus renewable electricity into green hydrogen. Furthermore, the full electrolyzer system consists of only four industrialized modules, which makes the supply chain stable, transport easy and installation fast. No buildings needed.

The 3.1 MW electrolyzer plays a key role in the groundbreaking biological Power-to-X plant in Glansager, Denmark – a DKK 100 million investment by energy company Andel and global biogas producer Nature Energy. At the plant, green hydrogen produced by three of Stiesdal’s electrolyzer units is combined with CO₂ from the biogas process in a biological methanation system. This reaction produces e-methane, significantly boosting biogas output while reducing carbon emissions.

The Glansager Power-to-X plant is more than a regional energy project—it’s a real-world demonstration of how cost-effective green hydrogen can become a scalable climate solution. By producing hydrogen when electricity prices are low, the plant shows how we can economically unlock hydrogen for critical uses across heavy industry, transport, and energy storage.

Green hydrogen from projects like this can directly support the decarbonization of sectors that can’t simply plug into the grid—like steel manufacturing, shipping, and aviation. It also helps stabilize power systems by turning excess renewable energy into a storable, dispatchable fuel. The project proves that with the right timing, technology, and partnerships, green hydrogen is not just possible – it’s practical and affordable.

Upon reaching full operational capacity, the Glansager plant is projected to increase Nature Energy’s green gas production by 12,000 cubic meters daily. By combining CO₂ with green hydrogen in a biological methanation process, the methane content of the biogas can be increased by up to 78%, significantly boosting the plant’s overall output. The integration of Stiesdal’s HydroGen Electrolyzer has demonstrated the feasibility of producing cost-effective green hydrogen by capitalizing on periods of low electricity prices.

This initiative not only showcases the potential of flexible hydrogen production in balancing the energy grid but also sets a precedent for future Power-to-X projects aiming to optimize the use of renewable energy surpluses.