Elax Energy raises €30M to turn water heaters into grid batteries
What's the deal? French startup Elax EnergyDealroom has a profile for this one. Try Dealroom → has raised €30 million to scale its connected water-heater controls, which shift when electric tanks heat up to cut household bills and ease pressure on the grid. The round was backed by Crédit Mutuel ImpactDealroom has a profile for this one. Try Dealroom →, Fonds Révolution Environnementale et Solidaire, and NoriaDealroom has a profile for this one. Try Dealroom →.
What's the endgame? Elax installs a connected thermostat on existing water tanks in about 20 minutes, communicating over a mobile connection rather than home Wi-Fi. After observing usage habits, it adjusts heating cycles to avoid overheating and times consumption for when electricity is cheaper or more abundant.
The company says its system cuts a water heater's energy use by 20% to 25% — a figure covering hot-water production only, not the full electricity bill. It developed the measurement method with consultancy Carbone 4Dealroom has a profile for this one. Try Dealroom →.
Why now? France is moving some off-peak hours into the daytime, when solar output is higher, strengthening the case for smarter control than a fixed overnight schedule. The October flexibility pact also sets large-scale equipment-control targets for EDF and Octopus Energy.
A water tank holds a quality worth exploiting: it can heat long before the hot water is needed, storing it in an insulated reservoir. A 20:00 shower, in other words, does not require electricity at 20:00.
What could go wrong? Elax says it has already equipped nearly 100,000 social-housing units. The new money is meant to push beyond social landlords into private homes — an untested leap — and to convert potential grid benefits into reliable household savings.
The signal: The round is less an isolated climate-tech bet than a test of whether distributed devices can become grid flexibility at scale. As France promotes shifting consumption to cheaper, cleaner hours, the humble water heater is emerging as one of the cheapest batteries already installed in millions of homes.
Read more: frenchweb.fr
Image credit: Tony Webster
