[en] This report first gives an overview of the energy system by presenting the determining factors of energy demand and of CO₂ emissions per sector (housing and office building, transport, industry, agriculture, forestry and biomass), by analysing energy systems and CO₂ emissions (energy sources, energy vectors, networks and storage, energy and CO₂ assessment for France), and by describing the guidelines of the scenarios proposed by ANCRE. The three main scenarios are characterized by a stronger sobriety, an electricity-based de-carbonation (with a variant based on nuclear and renewable energies), and diversified vectors. They are notably compared to a trend-based reference scenario. Results are discussed in terms of energy consumption (primary and final energy, consumption by the different sectors), of energy production and CO₂ emissions. Scenarios are assessed in terms of economic, environmental and societal, political and strategic criteria. Some consequences for research topics and funding are identified