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Sign upOctober 25, 2022
SNCF
Rennes
After raising €4 million this year, Stolect, a French startup founded in 2019, 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, this initiative aims to target industrial companies and isolated sites with innovative energy solutions.
SNCF, a key partner for Stolect, is hosting the project at the Technicentre Maintenance Bretagne in Cesson-Sévigné, near Rennes. This is where the startup will construct its first demonstrator between late 2022 and June 2023. The system, known as a Carnot battery, is based on the principle of thermal conversion: electricity is stored in the form of heat and, during the discharge phase, the heat is converted back into electricity, which is reinjected on-site or into the grid. The patented design comprises two chambers—each five meters in diameter and six meters high—circulated by air alone.
With a capacity of 1 MW / 5 MWh, the system incorporates 100 tons of refractory materials such as basalt and ceramics to store and release energy effectively. Tests, utilizing electricity drawn from the grid, are scheduled to begin in 2023. After six months of testing, STOLECT could then launch the marketing of its solutions in 2024 and change dimension with some twenty units deployed by 2026.
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.
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