Great importance is ascribed to the production of green hydrogen as a substitute for fossil resources in order to achieve the 2045 climate targets. However, around one third of the electrical energy used in hydrogen electrolysis using proton exchange membranes (PEM) is converted into waste heat. In addition, the oxygen produced during the electrolysis process remains mostly unused. In the IntegrH2ate project, Fraunhofer IEG and its project partner Linde GmbH are therefore investigating the utilization of the by-products from the hydrogen electrolysis process: heat and oxygen. The aim of the investigations is to increase the economic feasibility of the hydrogen production with PEM electrolysers. The IEG contributes to the project with its expertise in the fields of process engineering, thermodynamic converters and system integration of power plants. 4 million of the total funding of around 19 million euros will go to Fraunhofer IEG. The project is supported as part of the flagship project H2Giga by the German Federal Ministry of Research, Tecnology and Space (BMRTS). It will run for 45 months and is expected to end in September 2025.