Mouchot et al. evaluated the first years of operation at two industrial geothermal plants in Soultzsous-Forêts and Rittershoffen, both located in the French part of the Upper Rhine Grabben. These plants were commissioned in 2016. At Soultz-sous-Forêts, geothermal water is coming at the wellhead at 150⁰C and 23 bar. In the Rittershoffen geothermal plant, brine is produced at 170⁰C and 25 bar from a production well at 2700 m depth. The geothermal brines at the two sites are highly saline (i.e., ≈100 g/L), consisting mainly of Na + , Ca +2 and Cl -elements with a GLR of above 1 Nm 3 /m 3 . Due to the high amount of dissolved CO2, the surface facilities at Soultz-sous-Forêts and Rittershoffen are operated at pressures of 23 and 25 bar, respectively, to avoid CO2 degassing, steam flashing, and corrosion issues.