Network extension to Semitan HQ and Bellier hospital in Nantes • Rueil-Malmaison is constructing a geothermal energy plant and a heating network • The Dijon Metropole has obtained the EcoRéseau heat label awarded by Amorce • Read more about the developments in sustainable heating and cooling in this month's news update from France
12% of the homes in the Metropole of Nantes is already connected to the heating network, which counts more than 37,000 housing equivalents over a network of 145km. It will now be extended to two more buldings, the HQ of Semitan and the Bellier hospital. The network is currently divided into five sections where the most essential part is the “Centre-Loire” Network. It includes a large boiler room that sends hot water (ca. 100◦C) into to the network to supply public facilities and condominiums. It also has a smaller boiler that only operates between October and the end of May.
The large boiler Malakoff is managed by Erena (subsidy of Engie) and produced heat with energy from the Praire de Mauved waste-to-energy plant (41%) and biomass that mainly consists of residues from logging and sawmills (43%). At periods of extreme high demand, boilers powered by natural gas are used as backup. The Metropole will continue to bet on their district heating network in the future, with the explosion of gas and electricity prices.
The drilling for the geothermal power plant on the GéoRueil site was completed already in October of 2021 which now is awaiting civil engineering works for the building before installing the equipment this summer. Commissioning is planned for the fall of 2022 with the plans to supply 12,000 housing equivalents by 2024. This is, however, not all as the city has also begun to construct a heating network since the beginning of 2022. The project is estimated to take three years, which involves a 26km long underground pipeline and connections to 130 delivery points. The works have already started and with help of the energy from the geothermal plant: inhabitants of the Centre-Ville, Mazurières and Gallieni districts will soon benefit from more than 65% of renewable energies for heating and domestic hot water.
The project requires an investment of 71 MEUR with support from Ademe (18.99 MEUR) and the Ile-the-France region (5.5 MEUR). Engie solutions is responsible for the works and have also set up a mediation system to ensure local presence, communication, and mediation in with local residents to ensure trust and transparency. Only the geothermal plant will hep the city save 21,000 tons of CO2 per year.
The urban heating network is 76% supplied by renewable and recuperated energies which allows their subscribers to benefit from a VAT at 5.5%. It affects a 65km long network with an equivalent to 32,000 homes who are able to reduce their energy bills. In terms of supply, the network is partially powered by 45,000 tons of local wood energy, as well as a waste-to-energy unit, where older gas-and oil powered boilers have been dismantled.
The network is operated by Dijon Energies, while some of their equipment as the Péjoces boiler room is commissioned and operated by Dalkia. Their regional director, as well as the Mayor of Dijon explains heating networks as essential in stabilizing heating tariffs and reducing the region’s carbon footprints, now and in the future. The network currently helps reduce 40,000 tons of CO2 per year.
Sweden is at the forefront of decentralised heat networks technology. Our aim for “Sustainable Heating & Cooling by Sweden” is to facilitate knowledge sharing between British, French and Swedish stakeholders and develop and encourage environmental and economic best practice.
To find out how we can help you and your organisation, please contact our London or Paris-based “SHC” teams. We can introduce you to leading consultants, suppliers of technology and services who will be pleased to share know-how of the development of sustainable heating & cooling solutions.