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Nuclear fusion represents a practically inexhaustible source of energy. Fusion power plants will provide enough electricity for all of humanity without negative effects on the environment for millions of years. The lecture explains the basics of the energy use of nuclear fusion and introduces the current state of development of fusion devices. Are fusion power plants with tokamaks, laser fusion power plants or other alternative concepts closer to realization? The lecture is given by Slavomír Entler from the Institute of Plasma Physics of the Academy of Sciences of the Czech Republic.