Quest One (former H-TEC SYSTEMS) is a global leader in the field of PEM electrolysis. The company develops and produces innovative electrolyzers and electrolysis stacks for the economical, efficient and reliable production of green hydrogen. Quest One's declared goal is to make a significant contribution to the fight against climate change with its own products. The company's mission is to avoid one percent of global greenhouse gas emissions by 2050 through the use of its electrolyzers.

Founded in 1997 under the name H-TEC Hydrogen Energy Systems as a scientific project, Quest One has been a subsidiary of MAN Energy Solutions since 2021. The company combines decades of experience in the field of electrolysis technology with the extensive know-how of its shareholders in the realization of large-scale projects and in heavy industry.

Quest One employs around 550 people at three locations: production and development of the electrolysis stacks are based in Hamburg, Germany, while the electrolyzers are produced at a site in Augsburg, Germany. The company has another location in the U.S. near Houston, Texas.

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