Tesvolt and Wemag Cooperate in the Battery Storage Sector

Wittenberg/Schwerin, 11 June 2018 – Utility company WEMAG is launching the Germany-wide distribution of Tesvolt commercial storage systems. Tesvolt, the storage system experts from Wittenberg, beat competitors to be chosen as WEMAG’s supplier for large commercial storage systems. These systems make it possible to store the electricity produced by, for example, solar or wind power installations on farms, factories or car showrooms at an average cost of just 9 euro cents per kilowatt hour (kWh).

“Cooperating with Tesvolt will allow us to offer our commercial customers very attractive energy storage solutions. The storage systems enable novel supply concepts, particularly for customers already producing their own renewable energy,” explains Michael Hillmann, WEMAG AG’s Sales Director. “The technical solutions and the quality of Tesvolt’s products, as well as their corporate philosophy, were compelling reasons to choose them as our partner.”

Suitable for all storage applications

“Everyone at Tesvolt is delighted to have found such a strong distribution partner in WEMAG. We won’t just be delivering storage systems, we will also be involved in WEMAG’s consulting services,” says Sven Huntemann, Area Manager Central/Eastern Germany at Tesvolt. “One of the reasons why WEMAG chose us was the fact that our storage systems provide a technical solution for every application — they’re always the right fit.”

The smallest Tesvolt storage system has a capacity of 10 kWh, the largest 1 MWh. Different-sized Tesvolt systems can be combined to suit applications with a storage demand of up to 100 MWh. “Our systems have a high charging speed of 1 C, which is very important for many customers. If, for example, the air conditioning fails in a stable, the animals’ lives depend on the storage system supplying the required energy quickly,” says Huntemann.

Thanks to their intelligent battery management system, Tesvolt storage systems can be expanded even years later. “Other storage systems on the market don’t offer this option; expansions are generally only possible within the first year, after which the age difference between the old and new battery cells starts causing problems,” explains Huntemann.

Efficient storage systems with a long service life

Tesvolt storage systems have a service life of up to 30 years, which is the equivalent of around 8,000 complete charge cycles with a depth of discharge (DoD) of 100 percent. At 92 percent, Tesvolt storage systems achieve one of the highest whole-system efficiency ratings found on the market. The systems are produced at the company’s facility in Lutherstadt Wittenberg.

Tesvolt will be presenting its battery storage systems at Intersolar Europe in Munich from 20–22 June 2018. Tesvolt booth: Hall B1, booth 550


The Schwerin-based company WEMAG AG is a green energy provider working across Germany, with regional roots in Mecklenburg-Vorpommern and Brandenburg, where it is also a power grid operator. Together with WEMAG Netz GmbH, the company is responsible for around 15,000 km of power lines, ranging from house connections to overhead transmission lines. The utility company supplies both private and commercial customers with electricity, gas and grid services.

WEMAG AG’s activities are shaped by its regional ties and by the principles of environmental protection and sustainability. Under the brand name wemio, WEMAG supplies green power from renewable sources to households and special-rate customers in industry and agriculture. Environmentally friendly gas products were added to its portfolio in 2011. WEMAG AG invests heavily in renewable energies, provides energy efficiency consulting and offers the general public the opportunity to become shareholders via Norddeutsche Energiegemeinschaft eG. Since January 2010, WEMAG AG has been majority-owned by the local authorities within its supply region.


WEMAG press contact
Dr Diana Kuhrau
Press officer of the WEMAG Group
Tel. +49 385 755-2289
Mobile +49 170 921-2289


TESVOLT specializes in commercial and industrial battery storage systems. The innovative company from Wittenberg produces lithium storage systems with prismatic battery cells from Samsung SDI, based on nickel manganese cobalt oxide. TESVOLT storage systems are always a good match, for high or low voltage, on- or off-grid. They can be used with any regenerative energy source or with combined heat and power units or fuel cells.
TESVOLT produces its commercial storage system solutions in series in Wittenberg, Germany, at Europe’s first gigafactory for battery storage systems, and delivers them all over the world. The company has already completed over 2,200 storage projects worldwide.

TESVOLT has won accolades including the German Entrepreneur Award for Rising Stars. The company also received The smarter E Award in the Outstanding Projects category as well as the international Alliance for Rural Electrification (ARE) Award for a project supplying off-grid energy to an avocado farm in southwest Australia.

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