NOVELTY - The method comprises rising a temperature of cells (C1, C2) until an operating temperature of an electrolyzer is 700-900 degrees C, where the electrolyzer comprises the cells, the cells comprises cathodes (2a, 2b) and anodes (4a, 4b) separated by electrolytes (6a, 6b), the cells are separated by interconnection plates (8), each interconnection plate defines the cathode adjacent to a cathodic compartment and the anode adjacent to an anodic compartment, and the cathodes are made from a cermet containing nickel, and applying a potential difference of 0.65 V at boundaries of each cell.    USE - The method is useful for operating a hydrogen generating station (claimed).    ADVANTAGE - The method is capable of eliminating the need for injecting reducing gas thus avoiding deterioration of conduction properties and electrochemical properties of the anode.    DETAILED DESCRIPTION - The method comprises rising a temperature of cells (C1, C2) until an operating temperature of an electrolyzer is 700-900 degrees C, where the electrolyzer comprises the cells, the cells comprises cathodes (2a, 2b) and anodes (4a, 4b) separated by electrolytes (6a, 6b), the cells are separated by interconnection plates (8), each interconnection plate defines the cathode adjacent to a cathodic compartment and the anode adjacent to an anodic compartment, and the cathodes are made from a cermet containing nickel, and applying a potential difference of 0.65 V at boundaries of each cell. The cathodic compartments are fed with nitrogen and steam in the application step. The method further comprises: supplying steam to the cathodic compartments; applying a potential difference at the boundaries of the basic cells to cause an electrolysis of water; and collecting hydrogen produced with the cathodes and oxygen produced with the anodes. The supplying step and the causing electrolysis step are carried out simultaneously. A water steam output in the supplying step is increased compared to that of the application step. A current at the boundaries of the cells is measured at during the application step. The supplying step begins when the current measured at the boundaries of the cells is lower than a predetermined threshold value. An INDEPENDENT CLAIM is included for a station for producing hydrogen.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic sectional view of a high temperature electrolyzer.    Cathodes (2a, 2b)    Anodes (4a, 4b)    Electrolytes (6a, 6b)    Interconnection plates (8)    Cells. (C1, C2)