Grants for geothermal and hydroelectric power
In brief
A business developing a geothermal, air-source heat, sea-water thermal or hydroelectric project can access grants from ADEME, the Fonds Chaleur and several Regions. This page lists the schemes currently validated for this trade, with their funder and maximum amount where available.
This sector covers heat, cooling or electricity production from geothermal energy (shallow or deep), air-source heat, sea-water thermal energy, or hydroelectric power.
ADEME funds the entire process: a decision-support study, then investment in the installation, as well as the extension of heating networks.
The Fonds Chaleur (run locally by Regions and metropolitan areas such as Grenoble-Alpes) supplements this support, alongside regional grants dedicated to hydroelectric power (Bourgogne-Franche-Comté) or geothermal energy (Occitanie, PACA).
This page helps you identify relevant funding leads. However, it does not replace an individual check of your eligibility.
Run a personalised scan to identify the public grants and funding your company may be able to access.
What projects are covered?
The grants listed here fund the feasibility study and investment in a geothermal, air-source heat, sea-water thermal or hydroelectric installation, as well as the extension of associated heating or cooling networks.
What amount can you obtain?
The highest known amount reaches €45,000 for the Occitanie regional support for the development of geothermal installations; ADEME grants for studies and installations are calculated case by case.
How do you identify the funding suited to your project?
The number of schemes listed makes manual selection lengthy, and sometimes imprecise.
The Capital OS scan automatically cross-references these criteria with the full database of referenced public grants, to identify the ones that genuinely concern you:
- Your location
- The technology targeted (geothermal, air-source heat, sea-water thermal, hydroelectric)
- The stage of your project (study, investment)
Public grants for geothermal and hydroelectric power
Aide au développement des installations géothermiques
Région Occitanie
Up to €45,000
Closes on 31 Dec 2026
Études pour une installation hydroélectrique
ADEME
Closes on 31 Dec 2026
Étude d'aide à la décision pour les projets de géothermie de surface, d'aérothermie ou de thalassothermie
ADEME
Closes on 31 Dec 2026
Étude d'aide à la décision pour les projets de géothermie profonde
ADEME
Closes on 31 Dec 2026
Installations de production de chaleur à partir de géothermie profonde
ADEME
Closes on 31 Dec 2026
Installations de production de chaleur et de froid à partir de boucle d’eau tempérée géothermique
ADEME
Closes on 31 Dec 2026
Installations de production de chaleur et de froid renouvelable à partir de géothermie de surface, d’aérothermie ou de thalassothermie
ADEME
Closes on 31 Dec 2026
Extension et création de réseaux de chaleur ou de froid
ADEME
Closes on 31 Dec 2026
Aide aux travaux de géothermie/thalassothermie
Région Sud Provence-Alpes-Côte d'Azur
Aides aux études de faisabilité pour les projets de géothermie/thalassothermie
Région Sud Provence-Alpes-Côte d'Azur
Fonds Chaleur - Aide à l'installation de production de chaleur à partir de la géothermie de surface
Région Nouvelle-Aquitaine
Closes on 30 Jun 2027
Fonds Chaleur - Grenoble Alpes Métropole
Grenoble-Alpes Métropole
Soutien à l'hydroélectricité
Région Bourgogne-Franche-Comté
FEDER - Energies renouvelables
Région Guadeloupe, Union Européenne-FEDER
Closes on 31 Dec 2027
FEDER - Energies renouvelables (études)
Région Réunion, Union Européenne-FEDER
Closes on 31 Dec 2027
Human-validated links (AideTagLink, VALIDATED status only — unreviewed proposals are never shown here). Sorted by amount, highest first (then by internal identifier to break ties between the many identical titles).
Frequently asked questions about geothermal and hydroelectric grants
What public grants exist for a geothermal or hydroelectric project?
15 open schemes are listed for this trade on Capital OS, run by ADEME, the Fonds Chaleur and several Regions.
The full list is presented above on this page, with the funder and the maximum amount of each grant where known.
What is the difference between shallow and deep geothermal energy?
Shallow geothermal energy uses the heat from the first few metres of the subsurface (geothermal heat pumps), while deep geothermal energy draws on aquifers or rock formations located several hundred or thousand metres down.
ADEME funds decision-support studies and installations for both approaches, through separate schemes.
Is my project eligible for these grants?
It depends on each scheme: most require a prior feasibility study and a precise location within the relevant territory.
This page does not presume your project's eligibility; the personalized assessment checks it based on your actual criteria.
How do I apply for this type of grant?
The application is made directly with ADEME or the relevant Region.
A personalized assessment first identifies the schemes genuinely relevant to your project, before you start the process.
This sector may match yours
Check the grants suited to your company
This page lists the schemes associated with this sector. The personalised report applies your real criteria — industry, size, location, project — before drawing any conclusion on eligibility.
See the opportunities identified by the scan, then access your personalised report.