France and Japan Build Giant Batteries for Cleaner Grids

Giant batteries are coming to France and Japan, and they could change how millions of people access clean energy.

French renewable energy company Neoen just announced two massive battery storage projects during a high-level economic forum in Tokyo. These aren't the batteries you put in your remote control. They're enormous systems designed to store renewable energy and keep power grids running smoothly.

The French project will tower over everything else in the country. Located in Vernou-la-Celle-sur-Seine near Paris, the 248-megawatt battery will store enough energy to power thousands of homes when solar panels go dark and wind turbines stop spinning. It's the first battery system in France powerful enough to connect directly to the national high-voltage transmission network.

Construction starts in summer 2026, with the system going live in 2028. The battery will help stabilize electricity in the greater Paris region by regulating voltage and frequency, keeping the lights on even when renewable sources fluctuate.

Meanwhile, Neoen is breaking new ground in Japan with the Ako Battery project. The 100-megawatt facility in Hyogo prefecture represents the company's first investment in the country. Construction begins within months, also targeting a 2028 launch date.

The Ripple Effect

These projects show how international collaboration is accelerating clean energy progress. The French battery uses equipment from Japanese manufacturer Nidec, assembled at a French factory near Saint-Étienne. It's the twelfth battery project the two companies have built together, creating jobs and expertise on both sides of the partnership.

Neoen already operates batteries across Australia, Germany, Finland, Italy, Sweden, and El Salvador. The company now has 2.8 gigawatts of battery storage either running or under construction worldwide. Their goal? Add another 10 gigawatts by 2030.

Battery storage solves one of renewable energy's biggest challenges: what to do when the sun isn't shining and the wind isn't blowing. These massive systems capture excess clean energy during peak production times and release it when demand spikes. That means less reliance on fossil fuel backup plants and more consistent access to renewable power.

France is already getting a taste of success with this approach. Neoen's first major French battery, the 92-megawatt Breizh Big Battery in Brittany, is nearly complete and about to start stabilizing that region's grid.

As countries race to meet climate goals, battery storage is becoming just as important as the solar panels and wind turbines themselves, helping clean energy work around the clock.