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[en] After an overview of some basic issues regarding energy (history, measurement units, world energy consumption, different types of energy, energy demand, energy resources, cost of energy imports), this report proposes an overview of the different new energies, of their means of production, and of their applications. It first addresses solar energies by distinguishing direct solar energy (thermal conversion, thermodynamic conversion, production of electric power with different types of plants, futuristic projects), and energies issued from phenomena resulting from solar activity (wind energy, sea energies, biomass). The second part addresses other sources of new energy by distinguishing those which will be soon exploited (geothermal energy, methane fermentation) or should be later exploited (thermonuclear fusion, hydrogen).