From ESS News
By the end of the first half of 2025, Germany’s official registry of energy installations recorded nearly two million battery storage systems in operation. This figure, now unofficially but safely surpassed into July , includes a gross power capacity of 14.535 gigawatts (GW) and a usable storage capacity of nearly 22.1 gigawatt-hours (GWh).
Photovoltaic home storage systems constitute the majority of these installations, with 1.967 million small battery storage units (up to 20 kilowatts) accounting for 11.5 GW of gross power and almost 18.3 GWh of usable capacity.
The medium segment, comprising commercial storage systems between 20 kilowatts and 1000 kilowatts, includes 14,827 facilities totaling 663 megawatts (MW) of power and over 900 megawatt-hours (MWh) of capacity. Additionally, 323 large battery storage systems contribute approximately 2.35 GW of power and nearly 2.9 GWh of storage capacity.
During the first six months of 2025, over 250,000 new battery storage systems began operation in Germany, adding nearly 2 GW of power and 3.55 GWh of capacity. Of this new capacity, large battery storage systems contributed 509.5 MW of power and 690 MWh of capacity across 73 new facilities.
Small photovoltaic home storage units made up the bulk of new additions, with 251,948 systems providing 1.34 GW and almost 2.7 GWh. In the medium segment, 2,418 new systems added 117.7 MW of power and 160 MWh of capacity.
Notably, Eco Stor commissioned a large battery storage facility with 103.5 MW of power and 238 MWh of capacity in the first half of the year, representing about one-third of the newly added large battery storage capacity during that period.
The expansion of battery storage is driven by increasing demand, highlighted by 389 hours of negative wholesale electricity prices in the first half of the year. Germany has also significantly expanded its solar power generation, with approximately 107.4 GW of photovoltaic capacity installed and over 7 GW added in the first six months of 2025.
Future
The expansion appears to show no signs of slowing. The registry shows 19,720 systems in planning with a planned output of just under 4.7 GW and a capacity of just over 9.4 GWh.
Being planned are:
- 18,653 small storage systems up to 20 kW with 126.7 MW output and 515.6 MWh capacity;
- 627 commercial storage systems at 97.9 MW / 171.6 MWh;
- And, 440 large-scale storage systems, with just under 4.35 GW / 8.72 GWh.
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