The new unit is built on the same modular, outdoor-installed pressurized alkaline platform that has been in commercial operation since 2023. Its deployment record includes European Energy’s Måde PtX facility in Denmark, where Stiesdal Hydrogen’s fifth unit went from site delivery to first hydrogen in 16 days.

Designed for dynamic operation, the electrolyzer is stated to support fast ramp rates and frequent starts and stops without affecting lifetime or performance. Technical specifications include 1,275 Nm³/h net pure H₂ production, 99.5% hydrogen purity, delivery pressure from ambient to 35 bar, a 15–100% operating range, system power consumption of 4.8–5.1 kWh/Nm³, ramp-up and ramp-down rates of 2% and 50% power per second, a 60,000-hour or 7-year stack lifetime at 100% CF, and a footprint of 22 m² per MW.

The higher output is achieved by doubling the current density on Stiesdal Hydrogen’s proprietary electrode and stack design. The company said it has tested the durability and long-term effect of the higher current density in in-house laboratories and short-stack testing facilities, with positive results. It also said per-MW operation and maintenance costs are reduced by approximately 50% compared with the 3.1 MW platform.

The stated system CAPEX below €500/kW for a 6.5 MW electrolyzer includes the MV transformer. The company said specific pricing depends on its standard terms and conditions, including delivery schedule, volume, and warranty period duration.

Esben Baltzer Nielsen, Director of Sales and Business Development at Stiesdal Hydrogen, said: “We’ve doubled the production on roughly the same footprint, reducing LCOH through increased power on our existing technology. This means fewer units to install, simpler balance of plant, and a faster route from decision to first hydrogen. With this boost we halve the price per MW compared to the current European market average.”

Nielsen added: “The new 6.5 MW unit is particularly attractive for projects that operate dynamically to capture low power prices. Here, the CAPEX advantage becomes particularly pronounced. Our technology platform is designed for fast ramp rates and frequent start and stops without affecting the lifetime or performance.”

Source:  Hydrogentechworld