The invention relates to a wind generator for generating power thanks to the force of the wind or a stream of water. The invention includes a rotor provided with 2, 3 or 4 semi-frustoconical twisted blades practically parallel to the rotation axis, which is horizontal. It is silent, starts with a low-speed wind and can operate in very strong winds. It requires a very short mast, thereby considerably reducing the visual impact on the countryside and the environmental disturbance. It may be intended for dwellings, individual houses, ships, caravans, but also for agricultural uses or any other applications requiring electric power or the like.