As the world confronts the urgent need to combat climate change by reducing greenhouse gas emissions, Europe is at the forefront of an energy transition aimed at decreasing its reliance on fossil fuels. Hydrogen has emerged as a promising alternative that can be efficiently transported through gas networks over long distances, aligning with various societal, economic, ecological, and technological objectives. To support the extensive network required for hydrogen transportation, Gas Distribution System Operators (DSOs) and Transmission System Operators (TSOs) play a central role in repurposing existing pipelines and building new infrastructure across Europe. The H2FlowTrace initiative, launched in September 2024, focuses on addressing the challenge of accurately measuring hydrogen flow in gas networks. This project, funded by EURAMET and coordinated by Cesame-Exadebit, brings together 17 partners from 11 European nations to develop a metrological infrastructure that ensures traceability for pure hydrogen and hydrogen-enriched natural gas (HENG) flowmeters. By enhancing energy management benefits, the project aims to overcome the current deficiency in calibrating hydrogen flow within gas networks. The consortium's collaborative efforts involve National Metrology Institutes (NMIs), Designated Institutes (DIs), research institutes, industrial entities, and a university, leveraging diverse expertise in flow measurement. With a focus on establishing a verified metrological framework, the project targets a wide flow spectrum to enable calibrations of pure hydrogen and HENG flowmeters with traceability to SI-units. This advancement not only addresses the calibration challenge but also strengthens Europe's position in the hydrogen economy. H2FlowTrace sets ambitious goals, including creating a system for tracking hydrogen flow within gas networks, establishing a robust metrological infrastructure for different flow rates and pressures, designing traceability transfer skids, and conducting intercomparisons to ensure measurement equivalence across different standards. These objectives align with the larger mission of fostering accurate hydrogen flow measurements, securing the supply chain, and advancing Europe's transition towards a sustainable energy future.