reached at a depth of 100 m was 122◦C . In 2004,the area Y2 was again drilled to a depth of 56 m to extract the hot fluid. Its temperature at that depth is around 94◦C . The hot water is currently used for spas and drying agricultural products. In the initial assessments of the MaeChan region concluded that the shallow fluids are not hot enough to generate electricity and drilling to depths of 1 km in the granite was not cost-effective. To assess the sizeof the reservoir without costly drilling, a magnetotelluric (MT)survey was conducted. The MT surveys are widely used in the past decades in geothermal exploration to reveal hydrothermal systems beneath the surface and to help define the drilling locations for the production wells This is because of its major advantage as it is the only method that can directly sense a geothermal reservoir from its electrical resistivityfrom the surface down to depths of several kilometers