Abstract: The system for converting energy from flowing media with a rotor, in particular with an H-Darrieus rotor, comprising rotor blades made of a fibre-reinforced plastic profile manufactured in an injection moulding process, whereby the fibres of the plastic profile are carbon fibres and/or where the plastic is a thermoplastic material. The rotor blades of H-Darrieus rotor are connected to a shaft by means of radial struts and/or by means of diagonal struts and rotor blade connection components are arranged between the respective rotor blade and the radial struts and/or diagonal struts as a connection. Das rotor blade connection component comprises an enclosing element around at least part of the profile of the rotor blade and a corresponding connection element for the respective radial strut and/or diagonal strut.