The late 1970s saw the use of geothermal resources located 2,000 metres under the Ile de France region. These low temperature geothermal resources were regulated from 1978 by a decree allowing their use, as in France the ground below the surface belongs to the State. To encourage this expansion, a Short Term Fund was set up prior to 1981 to cover the geological risks linked to the performance of deep drilling. In 1982, a Long Term Fund took place managed by the SAF Environment subsidiary of the

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... Caisse des Dépôts et Consignations, to cover the operating life of the geothermal installations for 15 years. These are the measures that made possible the installation of 500 MW of thermal power for a cumulative saving in 3 MTOE of fossil fuels over a 35-year period. This article is a synthesis of the study to summarize the 35 years of geothermal risk mitigation system in force from 1980 until now, executed for ADEME (The French Environmental and Energy Management Agency) in 2016.