Geophysical Method is one of the methods in the Geothermal field exploration stage to get subsurface image related to Geothermal systems. The MT (Magnetotelluric) survey is one of the important geophysics methods for mapping geothermal system models based on the distribution of resistivity values. The MT (Magnetotelluric) survey can also be used to determine reservoir peaks, delineate reservoir boundaries and determine target areas (sweet zones) properly. In Addition, if existing well data can be available, MT (Magnetotelluric) must also be bound or adjusted to the well data to get the best interpretation results. To confirm the final modeling of interpretation together with other geophysical methods, the Geological method and the Geochemical method are also needed. The wellbore data (from "successful" and "unsuccessful" drilling) contains very valuable subsurface information that can be used to confirm the processing data of MT (Magnetotelluric) resistivity values. Precise and accurate data processing of MT (Magnetotelluric) raw data can ensure the best quality of the final product to reduce the uncertainty of depicting subsurface resistivity. All stages of this activity will eventually be able to redefine the reservoir boundaries and can recommend the target drilling area. And then it can reduce the uncertainty or risk of drilling the next well.