Hystar AS, a leading provider of PEM electrolyzers, announced a strategic collaboration with McDermott to develop a comprehensive 100-megawatt (MW) green hydrogen plant design. The announcement was made on December 8, 2025, during the Hydrogen Technology World Expo in Hamburg.

Technology Partnership Details

Under the agreement, Hystar will provide its proprietary, high-efficiency and high-safety PEM electrolyzer technology. McDermott will leverage its extensive global expertise as an engineering, procurement and construction (EPC) provider for major energy infrastructure. The collaboration combines Hystar's electrolyzer technology with McDermott's proven hydrogen execution expertise to develop a full-facility reference design optimized for scalability, flexibility, safety, and cost efficiency.

The 100 MW reference plant will serve as a blueprint for future commercial hydrogen projects, enabling faster development and streamlined delivery for industries such as refineries, ammonia, steel, heavy transport, and synthetic fuels. The collaboration aims to offer customers an integrated, ready-to-deploy plant architecture that reduces technical risk, simplifies procurement, and shortens time to market.

McDermott's Engineering Expertise

McDermott brings more than a century of engineering excellence to the partnership, having delivered numerous large-scale hydrogen, ammonia, and low-carbon projects. The company's portfolio includes pre-FEED, FEED and EPC execution for blue and green hydrogen facilities, ammonia plants, hydrogen hubs, and modularized energy projects worldwide.

McDermott operates in over 30 countries with locally-focused and globally-integrated resources that include more than 30,000 employees, a diversified fleet of specialty marine construction vessels and fabrication facilities around the world. The company is described as a premier, fully-integrated provider of engineering and construction solutions to the energy industry.

Industry Impact and Market Applications

This collaboration marks a significant milestone in Hystar's mission to accelerate global deployment of its large-scale green hydrogen solution. The partnership strengthens Hystar's position as a leading technology provider and demonstrates its continued commitment to enabling the transition to cost-effective green hydrogen worldwide.

The reference design is intended to support various industrial applications requiring large-scale hydrogen production, including refineries, ammonia production, steel manufacturing, heavy transport, and synthetic fuel production. The standardized approach aims to streamline the development process for future commercial hydrogen projects across these sectors.

Executive Perspectives

Rob Shaul, McDermott's Senior Vice President of Low Carbon Solutions, stated that the collaboration reflects both companies' shared commitment to advancing the energy transition. “By combining McDermott's engineering and EPC expertise with Hystar's innovative PEM technology, we're creating a scalable solution to support future green hydrogen projects,” Shaul said.

Fredrik Mowill, Hystar CEO, emphasized the strategic value of the partnership, noting that working with McDermott ensures that Hystar's leading PEM technology can be scaled efficiently and deployed worldwide through a proven EPCI framework. Hystar is described as making highly efficient PEM electrolyzers for the large-scale production of green hydrogen, with its patented technology playing a key role in accelerating the energy transition by enabling cost-effective green hydrogen production.

McDermott's technology-driven approach is designed to responsibly harness and transform global energy resources into products needed worldwide, advancing the next generation of global energy infrastructure.

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