Funded by French Environment and Energy Management Agency and jointly funded by Edf (French Electricity Company), this thesis consists to study role of future scenarios in hydrogen's valuation process. Main goal is to understand how supporters of this energy vector themseves organize, build common argumentations and retranscribe these elements within future scenario. Then, interest of this project is to analyze in what extend a scenario can have a performative power on public policies, and also on actors' beliefs and behaviors.With this in mind, we plan to study networks of the arguments used by actors. Finally, we would like to map of arguments actors use for advocating or limiting hydrogen's diffusion in different systems (energy, mobility ones) and associated applications (fuel cell vehicles, stationnary fuel cell...).

Key words : energy policies, hydrogen, fuel cell, France, Japan, economic sociology, actors coalition, networks analysis