Efficiency is today a key topic when running simulations across HPC and AI supercomputers. It is then important to leverage efficiency for every component of the supercomputer, choosing the most appropriate technologies, integrating them efficiently but also increasing the efficiency of the applications on those systems. To do so, all along the lifetime of the Deucalion supercomputer, Fujitsu and its partners will support end-users and developers to be prepared for the Exascale era, including the possibility to port energy optimizer tools and access to european experts.