Dry steam systems are based on conventional steam power plant technologies that have been adapted for geothermal applications. A simplified schematic diagram of a dry steam system is shown in Fig. 24-17. Dry steam systems typically exploit geothermal reservoirs containing dry, superheated steam at temperatures exceeding 392° F (200° C). Slightly superheated steam from the production wells operate a condensing steam turbine-generator. The condensate is used as makeup water for a mechanical draft cooling tower. Cooling water blowdown is then reinjected back into the
geothermal reservoir.