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STOLECT Carnot battery

A battery for the grid that stores electricity by heating refractory materials

July 2022
Gallery STOLECT Carnot battery 1
Gallery STOLECT Carnot battery 1


STOLECT Carnot battery offers a new electricity storage technology to support the development of renewable energies. Massive quantities of storage are needed on the electric grids in order to reduce the need for fossil backup production when renewables are not producing and to create 100% renewable systems in the future. STOLECT works thanks to the reversible conversion of electrical energy into thermal energy, using turbines and compressors that circulate air in a closed circuit. Energy, in the form of heat, is stored by heating readily available natural materials, such as basaltic rocks, or recycled ceramics. By offering a technology that is not dependent on critical materials, that can be installed anywhere and that is totally environmentally friendly, STOLECT has the potential to greatly reduce the environmental impact of electric systems in all geographical zones, in particular for small networks, in islands for example.

Label Date July 22, 2022
By Stolect
From France
Maturity stage Prototype testing 1:1 in the lab
Looking For New clients, Visibility, Funding, Partners, Network, Credibility

Implementation Stories

STOLECT Carnot battery by Stolect
Implemented by SNCF in Rennes (France) in 2022

After raising €4 million this year, the startup is preparing to build a full-scale demonstrator on an SNCF site near Rennes, supported by the Brittany region and approved by the SMILE project. STOLECT is targeting industrial companies and isolated sites. The 1 MW demonstrator, with a storage capacity of 5 MWh, should be operational in the second half of 2023. After six months of testing, STOLECT, which has been awarded the Solar Impulse label, could then launch the marketing of its solutions in 2024 and change dimension with some twenty units deployed by 2026.



The environmental benefits

  • The first system built have a power rating of 0,7 MW and a energy capacity of 3.5 MWh, other models, 10 times bigger in the next generation, could be developed quickly
  • 0% of critical materials used : the system only uses readily available, cheap and abundant materials
  • A single charging cycle of the system avoids the emission of more than 1 tonne of CO2 in the atmosphere when compared with diesel generators
  • Thanks to its conception, the expected lifespan is at least 30 years, which corresponds to more than 15 000 tonnes of CO2 avoided compared to the use of fossile fuels
  • This solution allows to build 100% renewable electric grids

The Financial benefits

  • 3 times cheaper than lithium batteries in the long term
  • 5 times cheaper than fossil fuel equivalent in the long term

Activity Region

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  • Headquarters
  • Activity

Company Profile


STOLECT is a start-up developing an innovative and efficient electricity storage technology based on thermal conversion

View company profile Solution website
Headquarters 92500 Rueil-Malmaison, France
Contact the Solution Provider Add to Favorites

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 Stolect 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.