On December 18, Philippe Bouyssou, the Mayor of Ivry-sur-Seine, Pascal Savoldelli, the Chairman of Sadev 94 and Vice-Chair of the Departmental Council, and Frédéric Martin, Executive Vice-President of ENGIE Energie Services, showcased the geothermal drilling operations that began in October. This geothermal project will power the future district heating system for the Ivry Confluences Urban development zone, as well as 5,500 city center home equivalents.
The two boreholes that make up the Ivry-sur-Seine geothermal loop will be drilled to a depth of 1,600 meters between now and January 2016. They will tap into the Dogger aquifer that runs between Tours and Colmar - which contains water naturally heated to 66°C - to provide space heating and domestic hot water for the future Ivry Confluences Urban development zone and the city center. At between 1,500 and 2,000 meters below the surface, the Dogger aquifer is particularly well suited as a source of heat for the district heating networks of the Ile-de-France.
The Ivry-sur-Seine city authorities have two goals for this project: limiting the city's carbon footprint, and avoiding price fluctuations at the same time as containing the burden of energy costs on its budget and residents. Known as Géotelluence and with a total power rating of 70 MW - 10 MW of which will be contributed by the geothermal solution - the Ivry Confluences network will provide space heating and domestic hot water to the equivalent of 12,500 homes (7,000 in the Confluences development and 5,500 in the city center), thereby avoiding atmospheric emissions equivalent to 11,000 metric tons of CO2 every year.
Already connected to the two existing city center networks and the CPCU network (Compagnie Parisienne de Chauffage Urbain is owned jointly by the City of Paris and ENGIE), which already uses renewables and heat recovery techniques for half its energy input, the Ivry Confluences geothermal network will meet 67% of its energy demand from renewable sources.
Renewable and consistent, geothermal energy also offers the great benefit of extremely stable prices, and the fact that the majority of its energy input comes from renewable or recovered heat sources means that its users will also benefit from the reduced VAT rate of 5.5%.
Having established itself as the specialist in deep geothermal solutions, ENGIE Réseaux now provides 35% of all geothermal-originated heat in the Ile-de-France, and operates 10 geothermal heating networks serving the equivalent of 60,000 homes.
For the Géotelluence geothermal network, it is working alongside the Ivry-sur-Seine city authority on its sustainable city project and energy transition plans. Grégoire Wintrebert, District Heating Network Manager for the Eastern Ile-de-France at ENGIE Réseaux, believes that this project represents a new way of managing the resource: "Operators must move towards a more collaborative approach to managing the resource […]. We have completely left behind the days of profiting from high energy consumption. Our business model no longer consists of selling energy; it's all about delivering a service."