The project "SeWAGE PLANT H" is a joint project of Stadtentwässerung Hannover (SEH) together with the electrolysis plant manufacturer Aspens GmbH, the Institute for Electrical Energy Systems (IfES), the Institute for Urban Water Management and Waste Technology of Leibniz Universität Hannover (ISAH) and the Institute IWAR of Technische Universität Darmstadt. The central building block of the project is the sustainable hydrogen production with further use of all by-products (oxygen, heat) for sector coupling as well as the realization and implementation in existing plants.