Quest One, an electrolyzer manufacturer, is constructing a demonstration plant for its Modular Hydrogen Platform (MHP) PEM electrolyzer in Augsburg, Germany. This initiative aims to provide valuable insights into the construction, dimensions, and inner workings of large electrolyzers, which are often inaccessible at customers' sites. The project with MAN Energy Solutions targets the optimization of PEM electrolyzers to meet the rising demand for green hydrogen. The MHP, suitable for industrial-scale hydrogen production, is highlighted for its compatibility with renewable energy sources, high hydrogen quality, and scalability. Through the joint project, Quest One and MAN Energy Solutions seek to enhance system performance and operational parameters. The development is supported by the PEP.IN research project under the H2Giga hydrogen lighthouse project of the German Federal Ministry of Education and Research. The demonstration plant, scheduled for completion by 2026, will enable potential partners to observe the construction phases and visit the Augsburg site. With a focus on series production of PEM electrolyzers, the project aims to make green hydrogen more cost-effective and competitive in the market.