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Multidrains geothermal wells

Multi-Drain geothermal well for decarbonising district heating networks

October 2021
Gallery Multidrains geothermal wells 1
Gallery Multidrains geothermal wells 1


Heating in buildings is at the core of energy consumption. Thus decarbonise energy sources is crucial to reduce associated emissions. Geothermal district heating is defined as the use of geothermal sources to supply heat to a group of buildings through a distribution network. The main benefits of geothermal sources are provision of local, and flexible renewable energy. Even though there are plenty of geothermal sedimentary reservoirs to use, there is sometimes heterogeneities of geological properties that limited productivity. The goal is then to optimise the draining area and thus to increase the overall energy extracted from the ground. This multidrains technology steps up the efficiency of a geothermal solution.

Label Date October 25, 2021
From France
Maturity stage Small scale commercialization
Looking For Network, New clients, Visibility, Credibility

Implementation Stories

Multidrains geothermal wells by ENGIE
Implemented by City of Velizy-Villacoublay (France) in Velizy-Villacoublay (France) in 2021

The City of Velizy-Villacoublay in the Paris Basin wanted to use geothermal energy for its 19 km district heating networks – that were previously powered by gas and two cogeneration units – to cover more than 60% of the heat demand. They signed a 28-year contract with Engie for heat supply and upgraded the network to reach acceptable temperature and pressure levels for geothermal energy requirements. In 2022, Engie’s geothermal power plant of 18,2 MW was commissioned.


Expected savings of 22,439 t of co2 / year compared to a gas solution while heating 12,000 homes


The environmental benefits

  • Around 80% more efficient compared to a conventional solution
  • Saving 640,000 tons of CO2 over 30 years exploitation period compared to a fossil energy solution

The Financial benefits

  • Considering +20% of drilling costs, the productivity is increased drastically
  • Only 2 innovative wells drilled instead of 4 conventional wells needed to reach the flowrates expected to cover network needs, means around €8 million saved for a project
  • Use geothermal source means stable heat price over time

Activity Region

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  • Headquarters
  • Activity

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator ENGIE has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.