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Thermal waters, public baths in Budapest. Paris basin: an operating model for low-energy geothermal power The Paris Basin has the special characte- ristic of offering a strong link between the geothermal resources and the demand for heating, as numerous conurbations are situated directly above continuous aqui- fers. Out of the approximately 200,000 dwelling equivalents in France heated by geothermal heating networks, approxi- mately 170,000 are situated in the Paris region. This sedimentary basin has five large aqui- fers, including the Dogger which has the largest number of low-energy geothermal operations in the world, with 36 opera- tions currently recorded, which are used for collective heating applications. Putting this into context, a typical operation in the Paris region allows for the heating of approximately 4,000 to 5,000 homes. The Dogger covers an area of over 150,000 km2 with the temperature measured directly below the Paris region var ying between 56 °C and 85 °C according to the depth of the reservoir (between 1,600 and 1,800 m). The district heating networks supplied by the Dogger geothermal resource, which Paris-Orly airport is heated by geothermal energy ADP / CFG Services Since the end of 2010, the Southern and Western terminals of Paris-Orly airport have been partly heated by geothermal energy. One-third of the heat supplied is indeed of geothermal origin and originates from a borehole doublet that collects naturally hot (74 °C) water at a depth of 1,750 metres in the Dogger. Aéroports de Paris invested 12.7 million euros in this installation, for which ADEME and the Île-de-France region provided subsidies amounting to 30% of the total invest- ment cost.The Aéroports de Paris’ technical teams supervised this project, supported by the external skills of CFG Services for subsoil operations (studies, drilling and implementation of the dual geothermal system). In addition to offering major savings in gas consumption, geothermal energy will also prevent Aéroports de Paris from emit- ting 9,000 tonnes of CO2 per year into the atmosphere. Extension of the Sucy-en-Brie heat distribution network – Cofely GDF Suez Sucy-en-Brie is a perfect example of the mastery acquired by Cofely GDF Suez in the field of renewable energies. It shows that it is possible to develop the use of geothermal resources while guaranteeing their sustainability and increasing the number of benefi- ciaries via an extension of the heating distribution network. By drilling a new production well and converting the two existing wells into reinjection wells, Cofely GDF Suez has created the first geothermal “triplet” in the Île-de-France region.The works, rounded off by the extension of the heating distribution network (from 3 to 4 km), have increased the power of the new production plant (from 7 to 11 MW) and the number of dwelling equivalents supplied (from 2,350 to 2,900). are mainly exploited by private companies such as Dalkia, Cofely, IDEX Energie and Coriance a2a, but also by local public- private ventures (sociétés d’économie mixte – SEM), have been operated for nearly thirty years and have thus been fully amortised, with their average availability rate still approaching 95%. The oldest of these installations is situated at Melun l’Almont. Commissioned in 1969, it is still operating today. French know-how in the field of geothermal energy 8/ 9 Geothermal extractor Geothermal energy plant in Melun. © Laurent Mignaux – METL - MEDDE © Laurent Mignaux – METL - MEDDEPDF Image | GEOTHERMAL ENERGY District heating
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