This work presents the mutual influence of nearby grounding structures on each other in terms of safety parameters. To epitomise mutual influence, primarily a mathematical model of the double circuit transmission line, cling to the tower, close by a substation is considered. The model estimates the ground fault current venting into the encompassing soil, in case of single‐phase to ground fault at the tower, when mutual resistive effects of both groundings are taken into account and when they are ignored. Neglecting these effects leads to a false estimation of safety parameters such as ground‐fault current and touch voltages, which are frequently used in grounding design. It may lead to unnecessary expenditures on the safety design of the grounding system. For verification purposes, the practical application of the model is exhibited. Also, an interactive model between substation grounding (grid model) and nearby tower grounding (rod model) is examined in terms of safety parameters. To further validate, an experimental set up is built for two nearby groundings. Experimental results obtained through it are compared with the results of the finite‐element method and analytical method and are found to be favourable. Touch, step, and ground potential distribution profiles with and without considering nearby grounding are also presented.