Electric power is a primary necessity that continues to increase in line with population growth and industrial development. One of the key components in the power system is the grounding system, which serves to protect electrical installations from disturbances such as lightning strikes. In high-voltage transmission systems like the 150 kV Overhead Transmission Line (SUTT), the effectiveness of the grounding system significantly influences the reliability of power distribution. This study aims to analyze and compare the resistance values of two grounding methods: Multi Rod Grounding (MRG) and Multi Direct Grounding (MDG), applied to 150 kV transmission towers at the Tambun Substation. The methods used include direct field measurements and theoretical calculations to obtain the resistance values of each grounding method, along with an analysis of the margin of error between measured and calculated results.The results of this research are expected to provide recommendations for a more effective grounding system to reduce lightning-related disturbances and enhance the reliability of the power transmission system.This study compares two grounding methods on 150 kV transmission towers, namely Multi Rod Grounding (MRG) and Multi Direct Grounding (MDG). Measurement results show that the MDG method provides lower and more stable resistance values, ranging from 0.17 Ω to 0.33 Ω. In contrast, the MRG method shows greater variation, with the highest resistance value reaching 5.28 Ω. All values remain below the maximum limit of 5 Ω as specified in Standard kemnaker PER.02/MEN/2015. However, the stability and efficiency of the MDG method in dissipating fault currents to the ground make it the more favorable option.