Abstract A thermal energy foundation is an innovative combination of a foundation structure with thermal pipes that can absorb geothermal heat. This allows it to serve as an alternative source of electricity for the building above it. The goal of this technology is to help achieve sustainable infrastructure targets by minimizing the use of fossil fuels from a geotechnical perspective. This study aims to analyze the thermal effect on foundation deformation using the Finite Element Method approach. The modelling is done using PLAXIS software with element meshes to provide comprehensive deformation results. Additionally the model is used to vary the thermal parameters of the soil and the quality of the foundation concrete. The analysis results indicate that variations in thermal conductivity values lead to a 34.112% decrease in deformation due to reduced thermal conductivity while variations in the quality of concrete used in the foundation show a relatively small or insignificant effect on the deformation. Keywords Deformation geothermal energy foundation sustainable thermal