PARMENIDES addresses challenges in the energy system by providing interoperable solutions that harness the potential of Hybrid Energy Storage Systems.A key innovation is the PARMENIDES Energy Community Ontology streamlining energy community operations through optimized energy flows and local energy maximization.The project introduces an Energy Management System for Hybrid Energy Storage Systems, utilizing ontology as a knowledge base and for extended information inference.Diverse PARMENIDES use cases cover scenarios ranging from passive energy community participation to fully automated optimization.These use cases vary in automation levels, optimization features, and flexibility strategies.The developed Information and Communication Technology architecture ensures interoperability, reliability, and security.Components include a Grid Capacity System, Grid Monitoring Devices and Smart Meters, an Information and Configuration System as a central repository for knowledge and data and an Energy Management System.Specific instantiations of the architecture will be implemented in the Austrian and Swedish pilots.