It is nowadays becoming increasingly common for new onshore structures and electrification systems to be installed in close vicinity to existing underground pipelines already equipped with their own CP and earthing systems. The problem with sharing common right of way between different structures is that their different earthing and CP systems are likely to interfere with each other. The coupling may reduce the performance of the individual designs or lead to major problems such as stray currents or shielding effects. Numerical modelling of these types of scenarios allows identifying such problems in advance, gaining understanding on the nature of the interference, and evaluating possible mitigation strategies. In this work the impact of constructing a solar power station across a set of transmission pipelines is investigated. The pipelines are protected by an ICCP system. The solar array includes galvanized piles and copper earthing system. The territory is mainly composed of clays or muds with flat and slightly undulating shapes with average resistivities in the order of 900 O-cm. Simulation results are presented showing the status of the pipelines before and after the solar array is constructed, as well as the solar array considering that the pipeline does not exist. The results show that the solar array piles and earthing system have measurable effects on the CP potentials on the pipeline.