Gillner, MarkusMarkusGillnerWestphal, JanJanWestphalWiegel, BélaBélaWiegelSteffen, TomTomSteffenUrbansky, JulianJulianUrbanskyHagemeier, AnneAnneHagemeierRuppert, StefanieStefanieRuppertHeyer, AnnikaAnnikaHeyerBenthin, JörnJörnBenthinHanke, Tim JonasTim JonasHankeBrunnemann, JohannesJohannesBrunnemannBecker, ChristianChristianBeckerSpeerforck, ArneArneSpeerforck2025-11-282025-11-282025-10-2416th International Modelica & FMI Conference 2025https://hdl.handle.net/11420/59271The TransiEnt Library is an open-source Modelica Libraryoriginally developed at the Hamburg University ofTechnology. It is a flexible framework for modelling andanalysing the dynamic behaviour of coupled energy systemsunder current and future scenarios. With the addition ofthree new members to the TransiEnt Library consortium,namely Fraunhofer UMSICHT, Gas- und Wärme-InstitutEssen~e.V. and XRG Simulation GmbH, the TransiEnt Libraryhas expanded its portfolio of models and methods forinvestigating the challenges in energy systems. Buildingupon the previous status report, this article presents thelatest developments in the TransiEnt library, highlithingits extended capabilities to model and simulate large,complex energy systems. The recent developments include theautomatic generation of aggregated models at district andregionals levels, as well as the modelling of medium- andlow-voltage electrical distribution networks. In addition,new concepts for the representation of large-scale heatingnetworks have been developed and are presented alongsideillustrative use cases.enDistrict Heating NetworkLarge-scale SimulationModelicaSector couplingTechnology::620: EngineeringConference Paper10.3384/ecp218989Conference Paper