The invention relates to a system, comprising a first device for producing ethyne by partially oxidizing at least one hydrocarbon, which first device produces a first product gas flow containing ethyne, a second device for electrothermally producing ethyne, which second device produces a second product gas flow containing ethyne, and a separating device for separating ethyne from a gas flow, to which separating device both the first product gas flow and the second product gas flow are fed. Said system can efficiently use excess electrical energy, in that the device for electrothermally producing ethyne is operated by means of excess electrical energy.