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Soultz-sous-Forêts: a leading pilot site for experimentation with EGS technology The GEIE-EMC operates an EGS (En- hanced Geothermal System)-type deep geothermal energy site, situated at Soultz-sous-Forêts/Kutzenhausenn in the Upper Rhine Plain. It is mana- ged by a consortium of Franco- German energy companies (ES, EDF, EnBW, Plazwerke, Steag and Bestec). The site comprises four geothermal wells at depths of between 3,600 and 5,000 m, which cut through frac- tured granite. The ORC-type power plant with a net output capacity of 1.5 MWe is powered by a geother- mal fluid (salt water – 100 g/L) at ~ 170 °C and ~ 40 L/s overall. The site benefits from scientific sup- por t (50 PhDs, 235 publications, 700 conferences and 400 technical reports) and a technical infrastruc- ture that allows for the performance of tests/experiments in the fields of surface facilities (production pumps, exchangers, sludge and corrosion prevention) and provides knowledge of sub-surface levels (reservoir mo- delling, plotting, etc.). www.geothermie-soultz.fr Soultz drilling rig – GEIE EMC. ELECTRICITY GENERATION BY EGS TECHNOLOGY Throughout the world, several projects are currently being carried out in order to develop geothermal power plants based on the “Enhanced Geo- thermal Systems” (EGS) technology, relying on the stimulation of hot, naturally fractured rocks. France pioneered this field with its scientific pilot project at Soultz-sous-Forêts. Cutting-edge technology Conventional geothermal operations are carried out on highly permeable reservoirs capable of providing high ouputs of geo- thermal fluid production. EGS-type tech- nologies seek to improve the hydraulic performances of environments that are fractured to varying extents (basement rock or sedimentar y rock in compact basins) and are not porous or permeable enough to be exploited using traditional methods. The extraction of heat from these forma- tions thus becomes possible provided that these environments are stimulated (hydraulically or chemically) in order to facilitate the circulation of the fluid and thermal exchanges. "Principle of EGS systems diagram of the Soultz-sous-Forêts power plant. – 1000 m – 2000 m – 3000 m – 4000 m – 5000 m Pumping of water at 200 °C Reinjection of cooled water Heat exchange Electricity generation Water circulation in fractures in hot rock © GEIE - EMC © GEIE - EMCPDF Image | GEOTHERMAL ENERGY District heating
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