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
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
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%

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