Half of the energy consumption of the European Union is comprised by heating and cooling, which are largely dependent on energy fossil fuels. In contrast, renewable energies only represent 18% of the heating and cooling production. This Thesis focuses on the integration of energy geostructures, namely tunnels, as renewable sources for heating and cooling applications. The research explores the concept of energy tunnels which are characterized by both thermal and structural behaviors and the harnessing of the ground temperature. In particular, the study addresses the thermal activation of tunnel linings, where heat exchanger pipes are embedded to capture geothermal energy in an efficient way.