Jimmy

Based in Levallois-Perret, France, and co-founded by Antoine Guyot (CEO) and Mathilde Grivet, in 2021, Jimmy, operates as a developer of thermal generators that helps the environment to decrease carbon releases. In March 2026, Jimmy raised EUR 40 million in growth capital funding led by Credit Mutuel Capital Prive, with participation from ADEME Investissement and Serena. The company designs and operates atomic thermal generators based on high-temperature nuclear micro-reactors (HTR) which create the desired heat and helps industries to produce carbon-free heat through its alternative solution. The company has developed a concrete box in which mini nuclear reactors creates carbon-free heat production, the produced heat is then transmitted to the primary and secondary circuit via an exchanger and then the heat is converted to coolant used by the industrial site including steam, thermal oil, hot air, etc.

, using a specific exchanger. This reactor is then installed by the company next to the customer's industrial site and since no CO2 is emitted, the firm makes it possible to considerably decarbonize the processes concerned. The company plans to utilize its March 2026 funding to complete reactor engineering work and prepare for its initial installation at the Cristanol industrial site.