The first barriers are in place and machinery has arrived on Avenue de l'Europe, marking the official launch of the SOGÉO heat network construction in Sèvres. Preparatory work, postponed by one month for organizational finalization, commenced on October 12, 2026. This network, powered by geothermal energy drawn from a depth of 1,500 meters, will eventually heat the equivalent of 4,170 Sèvres homes.
The construction is progressing in successive sections along Avenue de l'Europe, between number 25 and Place Gabriel-Péri. Each phase lasts one to four weeks. Phase 1, from October 12 to October 26, 2026, involves preparatory work and initial trenches. Phase 2, from October 26 to November 16, will cover the section between number 25 and Rue Pierre-Midrin. Phase 3, from November 16 to December 18, will extend from Rue Pierre-Midrin to the town hall roundabout.
This project aims to transform the heating methods for a large part of the town. The network will utilize 94% renewable energy, with 86% from geothermal sources, thereby reducing dependence on gas and fuel price fluctuations. Across the four involved municipalities, it will prevent the annual emission of 35,000 tons of CO2. Geothermal energy ensures continuous heat production, unlike solar or wind power.
The construction and operation of the network have been entrusted to SOGÉO (a subsidiary of Dalkia) by Sigeif (Public Service for Gas, Electricity, and Local Energy in Île-de-France), under a public service delegation that began in March 2026. Work takes place during daytime and weekdays, with diversions and traffic restrictions implemented. Access to buildings and emergency services remains guaranteed.
Ultimately, over 14 km of network will be deployed in Sèvres, serving the equivalent of 4,170 homes out of 11,100, as well as 89 buildings (68 residential buildings, 17 public buildings, and 4 tertiary buildings). In total, nearly 14,000 homes will be supplied across the four municipalities. The provisional commissioning of the geothermal energy is expected in 2030.
