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This report provides an overview of the activities carried out to establish and strengthen a Pan-Euro-pean community of interoperability testing facilities within the int:net project. The work builds on previ-ous efforts to harmonise testing concepts and map existing infrastructures and focuses on creating a collaborative environment that promotes knowledge exchange and alignment of testing practices across Europe. The report describes the development of the int:net Community Platform, especially the focus group related to interoperability testing, which serves as a central hub for sharing resources, best practices, and event information. These structures have enabled active engagement among stakeholders, includ-ing research organisations, universities, industry representatives, and networks. The community now comprises around sixty members from across Europe, ensuring a diverse and balanced representation. Several outreach and capacity-building activities have supported this effort. These include online ses-sions such as Lunch Talks, interoperability testing events organised in cooperation with ENTSO-E, and the Vienna Summer School, which provided training and fostered cross-sector dialogue. The report also highlights collaborations with European projects such as ENERSHARE and OMEGA-X, as well as in-ternational initiatives including DERlab, NFDI4Energy, and the International Energy Agency programs. These interactions have strengthened alignment with emerging frameworks and opened opportunities for future joint testing campaigns. In addition to community-building measures, the report presents tools developed to support interopera-bility testing and knowledge sharing. These include a secure data-sharing environment for laboratories, a semantic compliance verification tool, a dedicated interoperability lab for validating data exchange across energy platforms, and an online guide designed to help newcomers understand interoperability concepts and testing approaches. Together, these tools aim to harmonise testing practices, improve reproducibility, and provide practical resources for validating interoperability in real-world use cases. The report concludes by emphasising the importance of sustaining and expanding the community be-yond the project’s lifetime. Future work should focus on refining the developed tools, strengthening links with European data space initiatives and international standardisation efforts, and leveraging platforms to support ongoing collaboration and knowledge exchange.