Total number of Germany’s battery storage systems rises by third in 2025

A rapid increase in large-scale systems accelerated the growth of Germany's total battery storage capacity last year, pv magazine reported. A total of about 526,000 new batteries with a combined power output of almost 3.7 gigawatts (GW) and a storage capacity of around 7.3 gigawatt hours (GWh) were installed in 2025, according to data from the country’s grid agency BNetzA.

Because the average size of installed battery systems increased, capacity growth picked up even as new installations declined. In 2024, 561,000 new battery systems were installed, with overall power output amounting to 4.18 GW, and combined storage capacity to 6.16 GWh.

Including last year’s additions, Germany’s total battery storage capacity reached 25.5 GWh. The strong growth in 2025 means that Germany increased the total number of its battery storage systems by roughly a third to 2.2 million last year. Their collective power output rose to almost 16 GW.

Around 80 percent of Germany’s total battery capacity is represented by home systems connected to a solar PV system. But whereas the number of new home systems declined last year, installations of industrial-scale projects picked up significantly and is set to grow further: 460 projects with a storage capacity of more than one megawatt (MW) are currently in a planning stage, with a combined storage capacity of more than 10 GWh.

Large-scale batteries can help to use renewable energy more efficiently, and stabilise the grid at times of little solar or wind power output, thus reducing the need for grid expansion and backup power plants. But the systems could do much more to stabilise the power grid in Germany, an analysis by consultancy Neon found. The grid storage boom is driven mainly by rapidly dropping battery prices and the possibility of using them to profit from electricity price fluctuations. Germany's rapidly rising share of weather-dependent renewable energy makes the country a test bed for storage technologies.