According to a new report, 2021 residential energy storage system will still occupy the German battery energy storage market, but the deployment of grid scale energy storage system is facing new opportunities. According to the report entitled "Development and market review of battery energy storage systems in Germany (2022)", residential energy storage systems accounted for 93% of the 1357 megawatt battery energy storage systems deployed in Germany last year. The deployment of household energy storage systems was from 2013 to 2021. This paper was jointly written by the Aachen University of Technology and the power electronics and electric drive separation agency. Institute of Research (ISEA). The results of this study largely continue the trend pointed out in the survey report two years ago. The research report defines the domestic energy storage system (HSS) as a residential energy storage system less than 30 kWh, while Germany has deployed 145000 residential energy storage systems in 2021, with a total scale of 739 MW1268 MWh and 430000 residential energy storage systems in 2020. These data are roughly consistent with the research commissioned by the German Energy Storage Association (Bves). In contrast, Germany only deployed 27mw57mwh industrial energy storage system (ISS) of 30kwh~1mwh last year, while large-scale energy storage system (LSS) of 1mwh and above deployed only 36mw32mwh. Industrial energy storage system (ISS) and large-scale energy storage system (LSS) can be connected to the power grid, or battery energy storage system of commercial and industrial (C&I) clients.

Since 2013, the number of residential energy storage systems deployed in Germany has been increasing, as has the industrial energy storage system (ISS), despite its slow growth. On the other hand, since the record 88MWH Industrial Energy Storage System (ISS) was deployed in 2018, its deployment has dropped sharply, exceeding 10 times to 115MWh in 2021. The research report attributed the sharp decline of industrial energy storage system (ISS) to the saturation of frequency controlled reserve market (FCR), which mainly deployed utility scale energy storage systems from 2016 to 2019. Other problems in the German energy storage market include the dual charging of the energy storage system (that is, the energy storage system must be charged when charging and supplying power to the grid). According to an investigation by the German Energy Storage Association (Bves), the regulatory problem is actually the main problem of German energy storage asset operators. In an interview with industry media last year, the spokesman of the German Energy Storage Association (Bves) said, "The German government does not believe that energy storage system is the key factor in its energy transformation." Due to the growth of deployment of these barriers, in 2021, the household energy storage system (HSS) will account for 79% of the total energy storage capacity of 4406MWH battery energy storage systems in Germany, 17% of large energy storage systems (LSS), and the remaining 4% of industrial energy storage systems (ISS). However, the battery energy storage market in Germany is developing, allowing more grid scale energy storage systems to use renewable energy. The vast majority of domestic energy storage systems (HSS) and industrial energy storage systems (ISS) deployed in Germany last year are lithium-ion battery energy storage systems, while the 11 large-scale energy storage systems (LSS) deployed last year are all lithium-ion battery energy storage systems. Although LSS is the most diversified of the three systems after the diversification of energy storage technology deployment from 2017 to 2019, about one fifth use other technologies (mainly lead-acid battery, redox flow battery and thermal energy storage system)

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