The geothermal reservoirs underneath Paris are already providing low-energy heating to more than 250,000 homes and the Paris-Orly Airport. To responsibly manage this valuable resource, the Geothermal Institute of the University of Auckland, in collaboration with geothermal consulting company Geofluid, sought to improve its geotechnical understanding of the reservoirs. They used Leapfrog Geothermal to build a geological model that includes a numerical representation of the geothermal production in the area. The visualization gives all stakeholders an intuitive grasp of geothermal use, ensuring a sustainable zero-carbon heating source for much of the city.