Collective drainage for optimal performance of groundwater heat pumps in dense area

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Location : Grenoble, Presqu’île

Project team :  Innovia, Ville de Grenoble

Progress / Due date : first buildings connected

Contacts : Nathalie Moyon

The project

Highly efficient energy buildings require innovative technologies. In this case, the selected technology: geothermal heat pumps could not be applied straight forward in this particular area of Grenoble.

The Eco-Cité district La Presqu’ile is a former industrial area that is now being transformed in a mixeddistrict with housing, facilities, university and research institutes like the well-known particle acceleratorof CEA.

The heat pumps for the newly built residential buildings extract heat for heating homes and domestic hot water from the ground water. Research showed that the outlet water of the heat pumps would influence each other’s performance negatively. This effect was significant as the area will be very densely built, allowing only limited space between the individual heat pumps. By making one geothermal borehole (inlet) per building and collecting all water rejected by the heat pump (outlet) in a dedicated drainage network into the Isere river.

The result

This innovative solution of a collective outlet water drainage network is a good solution for areas where groundwater heat pumps are being applied in high density.

The next step

So far, two buildings are connected and operated (5,622 m²) and three others are in a test stage (7,490 m²).

Interested to know more about this project? Read all about it here or contact one of the involved partners.

Articles :

In Grenoble’s Presqu’ile Ecodistrict, 800 dwellings will be heated and cooled with geothermal energy

Geothermal energy for the Peninsula: guided tour of an innovative drainage network


  • The Project

    A city operating entirely on clean energy. In theory, it's possible. But in real life? How to integrate new solutions in existing buildings, systems and people's lives? What are the technical, economic or social barriers? And how to overcome these? That's what we've learned by doing in 20 projects in Grenoble and Amsterdam.

  • Our Activities

  • Achieved Impacts

    • 20 innovations in Grenoble & Amsterdam
    • 35,000 tonnes CO2 saved per year
    • 76,000 m² renovated residential buildings
    • 10,000 dwellings connected to a Smart Grid