Germany could break the gigawatt hour barrier for the first time on a monthly basis. So far in March, approximately 45,000 new residential photovoltaic storage systems have been registered in the market master data register.
The Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE) manages Energy Charts, which present easily digestible data from the German Market Master Data Register. This is the official system that registers storage assets ranging from utility-scale battery installations to commercial and residential systems, including small balcony solar power plants and plug-in storage devices.
Energy Charts show that in March 2026 battery storage systems with a total capacity of 522.9 MW and 985.9 MWh added. New systems can be added to the Data Register several weeks after they are installed, so the figures will increase in the coming days and are therefore likely to exceed the full 1 GWh limit for the first time.
Regardless of the final figure, this is the highest monthly increase in battery storage capacity in Germany to date.
The “Battery graphs” from RWTH Aachen University also allow users to filter growth by segment, with most coming from the large and small side. The cumulative installed capacity of residential storage systems increased from 20.43 to 20.75 GWh compared to February. Commercial storage systems increased from 1.39 to 1.42 GWh, and large-scale storage systems from 4.46 to 5.06 GWh. With only 30 MWh of commercial energy, most of the work is being done by residential enthusiasm for money saving and energy security, and by large-scale plants backed by investors.
The image below shows the growth in connections – note: February 2026 was a slower month, likely due to severe winter weather conditions.
The installed capacity across all segments amounted to 27.23 GWh at the end of March. The total capacity of battery storage systems was 17.90 GW, according to the Battery Charts. By the end of March, more than 2.4 million battery storage systems had been registered in the market master data register. Most of these are residential photovoltaic storage systemsof which, according to the latest figures, approximately 45,000 were added in March alone. At least 30 new large-scale storage systems were also registered in March, bringing the total to 489.
Previously, regarding new solar power generation, the German Federal Network Agency published what it calls its expectations for systems in March. Solar power generation showed an increase of 1.4 GW, a significant increase compared to the previous month, with more than half of the newly installed capacity coming from ground-mounted systems.
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