DEUS consortium is developping the largest cosmological Dark Matter simulations to date with realistic Dark Energy component, involving billions of particules, with highest spatial resolution for thebr largest set of simulated Universe. Our challenge is to reproduce withbr unprecedented details the cosmic structure formation process andbr answer to the fundamental questions: what can we learn on Dark Energy from Large Scale Structure Formation (LSS) ? and How LSSbr formation process is affected by the presence of Dark Energy ? and then to understand the nature of the Dark Energy.br www.deus-consortium.org, Contact: jean-michel.alimi@obspm.