Geothermal energy storage piles represent a notable alternative energy source for heating and cooling in buildings. This research work aims to investigate the thermal performance of energy storage with phase change material tubes embedded. The study was performed using numerical simulations on laboratory-scale energy piles, denoted as Design 1 (without phase change material) and Design 2 (with phase change material). The examination involved quantifying the thermal energy stored and extracted, furthermore studying the effect of embedded phase change material in the system. Various flow rates were applied to the systems to observe the effect on the energy stored and extracted. At all flow rates, Design 2 manifested a better performance in terms of energy stored at all flow rates employed, with an average improvement of 44% compared to Design 1. Therefore, the utilization of paraffin wax phase change materials within the storage pile emerges as a promising avenue to augment storage capacity and enhance heat exchange efficiency.