​France’s battery fleet is continuing to scale and is on track to reach 1.46 GW this quarter. Growth is slower than in solar-heavy Germany. But capacity is rising, driven by a dense layer of distributed batteries and emerging flagship projects.

This article explores:

• Current capacity and durations shaping the fleet
• Where projects are being built, and which developers are leading
• How the buildout will evolve toward 2030

For any further information on this topic, reach out to the author - timothee@modoenergy.com

​Key takeaways

• France’s battery fleet is continuing to scale and is on track to reach 1.46 GW this quarter.
• Durations are increasing: from a 1.1-hour fleet average today to new builds around 1.7 to 2 hours.
• Two growth paths define the market: a handful of projects above 100 MW and a dense layer of distributed 1 MW sites.
• French developer NW dominates operational capacity, but a wide set of independent power producers are now committing to large portfolios.
• Looking to 2030, France could exceed 4.7 GW of installed capacity, with both high-voltage and low-voltage buildout playing structural roles.

​France’s battery operational fleet is growing and starting to shift to longer durations

At the end of Q3 2025, France had just over 1.32 GW of operational grid-scale batteries. By the end of Q4 2025, installed capacity is expected to reach 1.46 GW, with 265 MW commissioned over the year.

​So far, most of the build-out has targeted short-duration ancillary services, and the operational fleet still averages about 1.1 hours.

New projects are trending toward longer builds: recent additions average over 1.7 hours, and most new announcements are close to 2 hours.

​A few large assets and a dense, distributed layer

France’s buildout is being shaped by two distinct growth models.

• Large-scale projects are emerging. Harmony Energy’s 100 MW / 200 MWh battery is operational, and large builds are underway at Cernay (TAG Energy, 240 MW / 480 MWh) and Saleux (Kallista Energy, 120 MW / 240 MWh).
• Distributed low-voltage batteries are spreading quickly. NW has built more than 750 single-MW systems connected to the distribution grid. This allows faster commissioning and earlier access to ancillary service revenues.

​The ownership picture tells the same story.

At 950 MW of operational battery capacity, NW dominates the market. A handful of early grid-scale storage investors hold the remaining capacity.

At the same time, a growing mix of players is entering the utility-scale segment, including utilities such as Alpiq and Eni, as well as IPPs such as Harmony Energy, Q Energy, TAG Energy, and Acacia.

Looking to 2030: faster growth ahead​

​Projections to 2030 show the buildout speeding up. Connected battery capacity in France could reach about 5.3 GW by year-end 2030, supported by a growing pipeline across both high- and low-voltage connection points.

​Large utility-scale projects will continue to connect to the high-voltage network, but their growth will be constrained by grid connection limits and the hosting capacity defined in RTE’s connection map.

In parallel, low-voltage battery projects will continue to expand, as developers favour these connections for faster commissioning and quicker access to ancillary service revenues.