Samsung SDI Partners with Tesvolt for Major Battery Storage Supply Agreement in Germany

Samsung SDI Signs Major Battery Storage Supply Agreement with Germany’s Tesvolt
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Samsung SDI has entered into a significant supply agreement to provide large-scale battery storage solutions to Tesvolt, a Germany-based specialist in the commercial and industrial (C&I) sector. This announcement was made on June 11, 2025, detailing the provision of two products from Samsung’s Battery Box (SBB) containerized 20-foot battery energy storage system (BESS) range.

Under this agreement, Samsung SDI will deliver its SBB 1.0 containerized battery storage units, which have a capacity of 1.92MW and 3.84MWh (2-hour duration), along with the SBB 1.5 units, offering 2.63MW and 5.26MWh (2-hour duration). Tesvolt will then integrate power conversion systems (PCS) and cybersecurity components to develop comprehensive solutions for their clients. Specific financial details and order volumes have not been disclosed.

Since its establishment in 2014, Tesvolt has primarily focused on the C&I market but is now expanding into utility-scale solutions, which could leverage Samsung SDI’s systems, as well as the residential sector. This collaboration builds upon a partnership that has existed since 2017, during which Samsung SDI has supplied lithium-ion (Li-ion) battery cells for Tesvolt’s branded BESS solutions.

Tesvolt is currently scaling up its production facility in Lutherstadt Wittenberg, Saxony-Anhalt, with plans to reach an annual capacity of 4GWh. The company recently announced its first grid-scale project, a 65MWh BESS in the Rhineland-Palatinate region of Germany, aimed at W Power and the local utility EWR, scheduled for summer 2024. Despite this expansion, Tesvolt remains committed to its C&I projects.

In March, Tesvolt launched a new subsidiary, Tesvolt Energy, which will engage in trading energy stored in C&I customers’ systems within the German power market, collaborating with companies such as enspired, Entrix, and The Mobility House. Sebastian Kratz, CEO of Tesvolt Energy, highlighted the significant potential for C&I storage systems in the German energy landscape.

In a recent announcement, Tesvolt provided insights into its partnership with Samsung SDI, specifically regarding the integration of cybersecurity features into the 5.26MWh SBB 1.5 solution, along with onsite project management platforms. Tesvolt’s CEO and co-founder, Daniel Hannemann, emphasized the importance of robust cybersecurity measures to protect larger battery systems from potential external threats, particularly in light of global political tensions. The company’s intelligent battery control system is designed to enhance cybersecurity.

The solution is tailored to meet the burgeoning demand in Germany’s utility-scale BESS market, complying with the country’s Critical Infrastructure Protection (KRITIS) legislation concerning IT infrastructure. Additionally, the data servers for system information are located within Germany.

Tesvolt’s offerings include comprehensive construction services, asset monitoring at the cell level, and maintenance support for utility customers. The SBB 1.5 system is designed for ancillary services and energy trading applications. One of the factors behind Tesvolt’s decision to partner with Samsung SDI is the implementation of Enhanced Direct Injection (EDI) technology, which enhances safety by injecting a cooling agent into battery modules if overheating is detected.

The SBB 1.5 comes with a warranty of up to 20 years, a flexible performance guarantee, a round-trip efficiency (RTE) exceeding 95%, and 97% availability. Dirk Kaisers, Samsung SDI’s energy storage system director, noted that simply providing a high-quality storage system is no longer sufficient; achieving profitability throughout the system’s lifespan requires minimizing downtime.

Unlike the rising trend among Chinese battery suppliers in the BESS industry to utilize lithium iron phosphate (LFP) cells, Samsung SDI employs nickel cobalt aluminum oxide (NCA) cells in its products. Samsung SDI is currently supplying SBB 1.0 units to Tesvolt until the end of this year, with deliveries of SBB 1.5 units set to commence in Q2 2026. In its Q1 2025 earnings call, Samsung SDI reported that it had secured orders for 90% of its planned production capacity for energy storage batteries this year.