GRT-2 is the second well drilled within the framework of the geothermal project ECOGI at Rittershoffen. The drilling of the well started in March 2014 and ended in July 2014. GRT-2 is a deviated well of 3196 m in length that reaches 2708 m TVD GL (true vertical depth from ground level) within the fractured granite basement. No reservoir enhancement was necessary at GRT-2. Production and circulation tests were realized from July to October 2014. The GRT-2 well is currently used as production well. It produces hot water at a temperature of 170 °C and with production flow rate of 70 L/s. Location of the GRT-2 wellhead (in WGS84): Latitude: 48.8970814354199° Longitude: 7.93865503246575°

GNSS data are recorded near Rittershoffen at ECOG, RITT, STUN and HATN stations and are provided by the operator ECOGI (ECOG, RITT) and EOST (STUN, HATN). Data format is Rinex. The stations are described :https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/GNSS-Stations See : https://cdgp.u-strasbg.fr/Obsnef-Gnss/situation.php for stations location and data availability

GRT-1 is the first well drilled within the framework of the geothermal project ECOGI at Rittershoffen. The drilling of the well began at the end of September 2012. The well reached a final measured depth of 2580 m within the fractured granite basement at the end of December 2012. Hydraulic tests of the well were carried out from December 2012 to June 2013. The tests realized at GRT-1 allowed to increase its injectivity index by a factor five. The GRT-1 well is currently used as injection well. Location of the GRT-1 wellhead (in WGS84): Latitude: 48.8965633979049 Longitude: 7.93818621036716

The ECOGI powerplant (https://geothermie.es.fr/en/references/projet-ecogi) is a geothermal powerplant designed by ÉS-Géothermie and located at Rittershoffen in northern Alsace, 7 km southeast of Soultz-sous-Forêts. The geothermal plant of Rittershoffen is operating since mid-2016 and produces 24 MWth of thermal power, with a production temperature of 170 °C. The geothermal heat production is directly used by a biorefinery located at Benheim. Two wells ensure the production and reinjection of the geothermal fluid. The development of the deep geothermal field took place between 2012 and 2014. Several earthquakes occurred between 2012 and 2014 during the drilling of the two wells GRT-1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/RIT-GRT1) and GRT-2 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/RIT-GRT2) and some of the hydraulic tests realized on site. The induced seismicity was recorded by a permanent and a temporary seismic network.

Description of GNSS stations set up around geothermal sites in Alsace. One station must be commissioned by the operator and its data are public. See target station locations and data availability (https://cdgp.u-strasbg.fr/Obsnef-Gnss/situation.php).