j4 srl is an engineering company specialised in strategic modeling, mathematical modeling and optimization, operating models innovation, for industries and public bodies. Through its j4energy model, it develops and implement advanced simulation and optimization models for large-scale energy systems (such as municipalities, regions, States, industry). We provide analyses, solutions and investment plans to optimize the costs and emissions of energy systems, improve their efficiency and reduce their impact on the environment and on human health. We imagine and realize a fossil-free future: our mission is to support public and private decision makers in the energy transition towards a sustainable future..