A low-carbon urban network solution for Issy-les-Moulineaux

The project ‘Issy Energies Vertes,’ developed by Veolia and the city of Issy-les-Moulineaux, will recover heat from wastewater for heating and cooling in buildings, a first in the Paris region.

Committed to an energy transition strategy since the adoption of the first French climate budget in 2021, the city of Issy-les-Moulineaux has embarked on an environmental quality strategy for the development of the Léon Blum "integrated development zone" (ZAC from "zone d'aménagement concerté" in French) around the future Issy RER train station of the Grand Paris Express.

Together with the local public company (SPL) Seine Ouest Aménagement and the constructors of the integrated development zone (Sefri-Cime, Aigo Promotion, OGIC and ICADE), the city chose Veolia to build and operate a heating and cooling network. The project will meet the energy needs of nearly 800 new housing units - 46% of which will be social housing - using a low-carbon solution.

The chosen solution will allow the production and distribution of heat mainly by heat recovery on the wastewater collector. A backup system that would harness the geothermal potential of the neighbourhood is also envisaged. It would aim to create an aquathermal doublet to capture heat from groundwater located about 30 meters below the municipality and extend the distribution perimeter to a total of 1270 homes.

This project has two advantages:

  • it is particularly environmentally friendly by reducing CO2 emissions by 80% compared to a 100% gas-powered solution, with a very low carbon score of 23 grams of CO2 per kWh;
  • it contributes to a more stable heat price over time since only one-third of it will depend on the price of electricity.

André Santini, Mayor of Issy-les-Moulineaux, considers that "this new innovative and virtuous project is part of our strategy to adapt the city to the consequences of climate change. After the use of geothermal energy at the Fort d'Issy and in the Issy Coeur de Ville eco-neighborhood and our hydrogen projects, the Issy Energies Vertes project demonstrates that we can act effectively to achieve carbon neutrality as quickly as possible."

Christophe Nebon, Managing Director of Veolia's energy business in France, said: "The city of Issy-les-Moulineaux, which has embarked on an ambitious low-carbon plan, was looking for a solution for urban networks to supply hot water and heating for the Léon Blum eco-district, using a minimum of 70% renewable energy. Our proposal consists of the valorisation of the city's wastewater associated with geothermal energy. With wastewater, we have a local energy source that is not yet widely used and is not subject to the volatility of other energy sources’ prices. This solution opens up vast prospects for meeting the carbon neutrality plan for cities by 2050 in a circular economy approach."


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