[en] The author reports a study which aims at being a contribution to prospective thoughts on electricity and on its role in the French energy landscape. For example, the hydrogen production capacity can be deliberately in surplus to produce hydrogen which will consumed outside of the electric power sector, or, reciprocally, an electric power consumption can be replaced by another easily stored form of energy during a period of tension. Thus, the author first addresses and discusses displacements of consumption and the definitive cut-off, while also considering a variant comprising hybrid heating. He analyses the configuration of the power production and storage fleet by addressing the following issues: production of synthetic gas to store electricity, means of production, grid stability, balance between power supply and consumption. He addresses the expenses and valorisation of possibilities of excess production: costs and expenses of production and of storage, valorisation of possibilities of excess production, case of definitive cut-off, economic assessment of an electric power production fleet with 50 pc of nuclear, production of hydrogen and methane for a use outside of electric power. He reports the study of another set of hypotheses with few or no wind or photovoltaic, and the study of a variant with only 15 GW of nuclear.