Abstract: An apparatus for producing superheated steam with solar energy is provided. The apparatus has a heat-transfer medium circuit with a heat transfer medium for absorbing the solar energy in the form of heat and a water/stream circuit with water and/or steam for forming the superheated steam. The water and/or the steam may flow in one direction in the water/steam circuit. For producing the superheated steam, the heat-transfer medium circuit and the water-steam circuit are thermally coupled to each other by a heat exchanger of a reheater. In the water/steam circuit, a water separator is arranged upstream of the heat exchanger in direction of flow for separating water and steam from each other, so that substantially only steam enters the heat exchanger. The heat exchanger and the water separator are arranged in a common reheating pressure vessel.