This geothermal project, in Le Plessis-Robinson, meet the commitment of the OPDH92 (Office Departmental Public Housing) for renewable energy. It is a concrete response to the "States General of the sustainable city" that aims to develop eco-responsibility. The Plessis Robinson’s district heating is mainly powered thanks to geothermal energy. Two wells were dug at 1 k m depth, in an aquifer. This geothermal district heating supplies around 3 500 housing, i.e. about 217 000 m2. The network is around 10 km in total.