Geothermal energy uses the thermal energy of the ground to cover heating, cooling and hot water needs. Through appropriate systems, it allows heat to be exchanged with the subsoil and reduce the energy that other equipment must provide to air condition a building.
One of its main applications is the air conditioning of facilities that maintain thermal needs throughout the year, such as service buildings or equipment for continuous use. Its performance depends, among other aspects, on the geological characteristics of the location, the design of the facility and the demand it must meet.
In Spain, Veolia served more than 100 customers using this technology in 2025. The company figures in more than 800 tons of CO₂ emissions avoided annually thanks to this activity.