| Member state | France |
| Case study | Alfortville |
| Description | In response to oil price crisis and in solidarity with the national effort, in 1982 the idea of performing an operation of geothermal begins at Alfortville. The DH heats 5400 housings. Wells are dug down to 1.8 km to the Dogger’s aquifer. |
| Region>City>location | Ile de France |
| Owner | SMAG |
| Operator | DALKIA |
| Installed capacity ( MWth) |
60 GWh |
| Installed geothermal capacity | 13 MW |
| DH length (m) |
5800 m |
| Inhabitants connected | 5400 |
| Operating Temperature of the DH | 95°C |
| Temperature of the geothermal ressource (production – injection) |
72°C – 40 à 50 °C |
| Geothermal flow rate |
280 m3/h |
| Production of heating and/or cooling | Heating (98%) + Sanitary hot water (2%) |
| Dates of begining and end of construction | 1985 |
| Difficulties faced | *Long regulatory procedures * Difficulties to find adapted submersible pumps to realize well tests (deep aquifer) * Difficulties to drill in urban area with high population density: neighbourhood nuisances (noise) *Difficulties to work in urban area for the network construction * Lack of training and competencies on this type of equipment. |
| Comparison with fossil energies | -5% compared to gas price |
| Taxes | 5,50% |
Alfortville
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