Co-simulation is commonly used for the analysis of complex cyber-physical energy systems (CPES). Different domain-specific simulation tools and modeling approaches are used to simulate all or parts of the system. The co-simulation framework MOSAIK is a powerful tool to couple these simulation tools and models. This paper identifies the limitations of MOSAIK 2 for simulating systems that combine continuous and discrete behavior, and introduces the new version MOSAIK 3.0 with improved event capabilities to efficiently combine timestepped and discrete event simulation. Here it is explained how these extensions and new features of MOSAIK can be applied and implemented for extended co-simulation scenarios.

No abstract