Hystar AS is a Norwegian clean‑technology company that develops and manufactures proton exchange membrane (PEM) water electrolysers for the production of green hydrogen. Headquartered near Oslo, the company focuses on electrolyser stacks and integrated systems for megawatt‑scale installations.
Hystar supplies equipment for industrial and energy applications, including chemical and fertilizer production, refining, e‑fuels, power‑to‑gas, and heavy‑transport fueling. It works with utilities and industrial partners on demonstration and commercial projects, with an emphasis on scalable manufacturing, quality control, and dependable performance for hydrogen supply.