The invention relates to an electrolysis plant having: a plurality of electrolysis cells which are electrically connected in series and are arranged consecutively at least in part in a stacking direction, wherein the series arrangement can be electrically coupled to an electrical power source; a cell supply unit for supplying the electrolysis cells with at least one process fluid for normal operation; and supply lines which are connected to the cell supply unit and to opposite ends of the consecutively arranged electrolysis cells. A material of the supply lines includes metal, and at least one of the supply lines includes an electrical insulating portion having a control electrode which protrudes at least partially into the interior of the electrical insulating portion. The control electrode has a catalyst material and is electrically contacted to a metal pipe section of the supply line at the anode end thereof.