NOVELTY - The geothermal wind system utilizes geothermal heat transfer to cause movement of air through one or more underground passages between two or more portals of vertically distant elevations. The air passed through the lower portal (2) is heated directly by geothermal temperature of the surrounding surface and is caused to rise a given vertical distance, obtaining high velocity of air by a stack effect. The heated air powers the turbines (5) linked to electrical generators prior to being expelled through the upper portal. The passage is used as a heat exchange tunnel (3).    USE - Geothermal wind system for power generation. Can be used for powering highways and electrical rails, as well as remote scientific or military posts, mining industries, industrial complexes and web servers, and can be used in third world countries having scarce water supply or starting new power systems.    ADVANTAGE - The venturi restriction can be designed to focus wind of higher or lower speeds into each turbine through the tunnel, maximizing performance. Since buoyancy and gravity create the driving force, the greater the elevation difference between portals, the more powerful the winds and greater the electrical power produced. The power produced using the geothermal wind system becomes more reliable, less polluting, and in the long run more inexpensive, since the system does not present pollution and carbon drawbacks of coal-fired plants and hazards of nuclear power plants. The geothermal wind system can also serve as a standby station to protect the grid when larger plants break down due to natural disaster or computer glitch or when peak demand threatens to overpower the plants.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method of power generation.    DESCRIPTION OF DRAWING(S) - The drawing shows the horizontal schematic view of a low temperature mode geothermal wind system.    Fauna protection plate (1)    Lower portal (2)    Heat exchange tunnel (3)    Turbines (5)    Cylindrical shaft (7)