Elax Energy, a French innovator in climate technology, has secured significant funding of 30 million euros in a new round. The company's goal is to transform standard water heaters into a distributed energy storage network to stabilize the national power system.
Instead of creating a futuristic super-battery, Elax Energy focuses on modernizing existing household appliances. Adding smart thermostats to standard tanks allows millions of homes to become a distributed energy storage network.
The principle of operation relies on the high heat capacity of water. If a water heater heats water at noon, when the system is saturated with solar energy, that hot water will be available for a shower in the evening. Thus, the appliance stores cheap and surplus electricity in the form of heat.
Elax Energy technicians install a connected thermostat on an existing boiler in about twenty minutes, without the need for complex integration with home Wi-Fi. The device operates autonomously via its own mobile connection, learning the unique consumption habits of the household to know precisely when hot water is needed and when it is not.
The system prevents unnecessary overheating and precisely regulates heating cycles, synchronizing them with the cheapest and cleanest hours on the grid. These 30 million euros will be used to expand Elax Energy's operations. Previously, the company operated discreetly, equipping about 100,000 residential units in social housing complexes across France.
Although the company has proven the equipment's viability on a large scale, entering the private market presents a completely different challenge. With support from major investors such as Crédit Mutuel Impact, Fonds Révolution Environnementale et Solidaire, and Noria, Elax is preparing for large-scale expansion in the residential sector.
The company aims to implement this technology directly in private homes. The transition from institutional landlords to individual homeowners is a complex step for any startup, but the new capital gives them the opportunity to enter the market, deploy the product, and guarantee real savings for consumers.
Time is critical as France transforms its energy strategy, shifting billing hours away from peak demand directly into the middle of the day to absorb surplus solar energy. The standard 'heat with the heater at night' mode no longer makes sense. Furthermore, the recent October flexibility pact in the country has created significant pressure on giants like EDF and Octopus Energy to control equipment on a large scale, and Elax fits perfectly into this picture.
In partnership with the environmental consulting firm Carbone 4, the startup confirmed that its smart technology reduces water heater energy consumption by 20%–25%. When multiplied by millions of households, this creates a highly sensitive, flexible network asset capable of absorbing renewable energy exactly when the wind blows or the sun shines.
While grid flexibility may sound like corporate jargon, the ultimate goal is deeply personal. Since global energy grids struggle with balancing unpredictable green energy, costs usually fall on the consumer. Transforming ordinary appliances into elements of a smart grid changes the rules: you get direct savings on water heating without changing your showering habits. This is a climate action that benefits you, making this funding round one of the most interesting of the year.
