Marten, FrankFrankMartenHammermeister, IreneIreneHammermeisterSuljanovic, NerminNerminSuljanovicSouvent, AndrejAndrejSouventPetrovic, NejcNejcPetrovicStopar, RokRokStoparLambert, EricEricLambertBraun, MartinMartinBraun2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26958710.1049/oap-cired.2021.0216Communication tools and techniques between transmission grid operator (TSO) and distribution grid operator (DSO) must be able to deal with increasingly larger volumes of information and these tools should be based on existing smart grid ICT standards. In the EU-project TDX-ASSIST, an international consortium of grid operators and researchers is working on the design and development of new ICT tools which meet these future challenges. This paper describes findings from two of the project's demonstration sites. Some demonstrations employ a communication and connectivity service platform (ECCo SP) which enables the use of flexibility platforms. Others employ co-simulations to emulate data exchanges between TSO, DSO and the grid. In the further course of TDX-ASSIST, the demonstration results will be used to establish feedback to standardisation bodies such as IEC, CEN/CENELEC/ETSI CG-SEG and working groups focused on TSO-DSO information exchange.enjournal article