TagEnergy and Banque des Territoires Join Forces to Boost Battery Storage in France

TagEnergy and Banque des Territoires have signed a strategic three-year investment partnership to accelerate the development of battery energy storage projects across France. The collaboration begins with the country’s largest stationary battery project to date — a 240 MW / 480 MWh system in Cernay-lès-Reims, Marne, where Banque des Territoires has acquired a 49% stake.

This partnership addresses the urgent need for energy storage infrastructure to support France’s transition to a decarbonized grid. Battery storage is critical for balancing intermittent renewable generation, reducing reliance on fossil fuel-based peak power, and strengthening grid reliability.

As part of its growth strategy, TagEnergy is rapidly expanding its solar and storage portfolio. The Cernay-lès-Reims project exemplifies this scale-up, offering nearly five times the capacity of any current operational battery system in France. Once operational in late 2025, the project is expected to cover 20% of residential electricity demand in the Marne region.

Banque des Territoires, which has been active in the battery sector since 2021, views energy storage as a cornerstone of the new low-carbon energy mix. This partnership aligns with its broader strategic mission to support France’s ecological transformation and enhance national energy sovereignty.

Under the agreement, Banque des Territoires will fund up to 49% of the capital needed for future projects, with TagEnergy retaining majority ownership.

Franck Woitiez, CEO of TagEnergy, said:

“This alliance with Banque des Territoires marks a major step in our national expansion. Together, we’re creating flexible, innovative solutions to power a cleaner, more resilient energy future for France.”

François Wohrer, Investment Director at Banque des Territoires, added:

“Storage is essential to the future of renewables. We are proud to back TagEnergy in delivering what will become France’s largest stationary storage system.”