Researchers at Finland’s LUT University have demonstrated a 1,000-volt alkaline electrolysis system, testing an approach that could reduce the infrastructure costs associated with producing green hydrogen. The laboratory achievement addresses a significant challenge for hydrogen developers: making renewable hydrogen production more economically competitive without compromising system efficiency.
The researchers achieved the higher voltage by connecting electrolyser stacks in series, an arrangement that allows electrical systems to operate at lower current for a given power level. According to LUT University, the demonstration may represent a world record for alkaline electrolysis, although the technology has not yet been validated at commercial scale.
The findings could have implications for hydrogen producers, power equipment manufacturers and industrial facilities evaluating hydrogen as an alternative to fossil fuels. Translating the laboratory results into measurable project savings, however, will require additional engineering and performance testing.
Rethinking the Electrical Costs of Hydrogen Production
Reducing the cost of green hydrogen typically involves improving electrolyser performance, lowering renewable electricity prices or increasing equipment utilization. LUT University’s research examines another component of production economics: the electrical infrastructure needed to power electrolysis systems.
Industrial alkaline electrolysers generally operate at voltages between 200 and 400 volts. By increasing the system voltage to 1,000 volts, researchers demonstrated how hydrogen facilities might reduce the current flowing through electrical equipment while maintaining comparable power capacity. Lower current can decrease electrical losses and potentially reduce the size and cost of certain system components.
Jero Ahola, professor of energy efficiency at LUT University, estimates that power supply infrastructure and power electronics represent approximately 25% of a hydrogen production facility’s initial investment. If those costs could be cut in half, overall plant capital expenditures could decline by an estimated 10% to 15%.
Those estimates represent potential savings rather than verified commercial outcomes. Actual reductions would depend on equipment configuration, plant capacity, operating conditions and the additional infrastructure needed to support higher-voltage operation.
The economics may be particularly relevant to hydrogen facilities powered by wind and solar generation. Variable electricity availability can limit annual operating hours, increasing the importance of controlling upfront capital costs. For developers evaluating projects with intermittent renewable power, reducing electrical infrastructure expenses could improve financial feasibility even without major changes to hydrogen production efficiency.
Equipment Compatibility and Scaling Challenges
The laboratory system incorporates power electronics provided by ABB and electrolyser stacks manufactured by Estonia-based Stargate Hydrogen. ABB also supports the research financially, bringing industrial equipment expertise into the development process.
To achieve 1,000 volts, LUT researchers connected nearly 500 electrolytic cells in series, with individual cells operating at approximately two volts. The configuration demonstrates how established electrical technologies could be adapted for hydrogen production, potentially reducing reliance on specialized power conversion equipment.
Similar high-voltage power electronics are already used in wind energy systems, solar installations and battery energy storage applications. Applying those technologies to hydrogen production could create opportunities for greater equipment standardization and integration across renewable energy infrastructure.
The configuration does, however, introduce technical challenges that must be resolved before widespread deployment. One concern involves stray electrical currents within the conductive electrolyte circulating through the system. These unintended current paths can increase energy losses, potentially offsetting some of the efficiency benefits associated with higher-voltage operation.
LUT’s next phase of research will examine methods for limiting stray currents and optimizing the relationship between operating voltage, system efficiency and equipment costs. Digital simulations and technical modeling will help researchers evaluate possible configurations for larger industrial installations.
Commercial performance will also depend on how hydrogen facilities operate. Electrolysers connected to steady power supplies may have different cost and efficiency requirements from installations that regularly adjust production in response to renewable electricity availability. Developers will need to assess whether potential savings in power electronics justify added system complexity and engineering requirements.
Although LUT has previously published research on high-voltage electrolysis, a peer-reviewed study specifically documenting the 1,000-volt demonstration has not yet been released. Larger-scale testing and independent evaluation will be necessary to establish long-term reliability and confirm the projected economic benefits.
For hydrogen developers facing persistent cost pressures, the work illustrates how electrical system design could influence project economics alongside electricity procurement and electrolyser technology. Whether high-voltage electrolysis becomes commercially practical will depend on achieving measurable capital savings while maintaining efficiency, operational reliability and safety at industrial scale.
