SUNOTEC advances 100 MW / 441 MWh project set to rank among Germany’s largest battery storage systems

Large-scale standalone BESS in Stendal, Saxony-Anhalt, moves into construction as SUNOTEC expands its energy storage activities across Europe.

Stendal, Germany, 31 August 2026 – SUNOTEC is advancing the delivery of a 100 MW / 441 MWh standalone battery energy storage system (BESS) in Stendal, Saxony-Anhalt. The storage project represents a significant addition to Germany’s rapidly expanding battery storage infrastructure and will rank among the country’s largest battery storage systems upon completion.

Following the project’s transition to Ready-to-Build status in the second quarter of 2026, SUNOTEC is leading its implementation as a full-turnkey provider, bringing together its engineering, installation and long-term operations and maintenance capabilities.

Commissioning is planned for Q1 2027.

Bringing large-scale storage expertise to Germany

The Stendal project marks another important step in SUNOTEC’s expansion of its battery storage activities across Europe.

Over recent years, the company has gained extensive experience deploying utility-scale battery storage infrastructure, with 6.1 GWh of BESS capacity installed across Europe. SUNOTEC is now applying this experience to other markets including Germany, where the accelerating integration of renewable generation is increasing demand for flexible energy infrastructure.

With 441 MWh of storage capacity, the Stendal project is designed to store electricity when supply is high and make it available again when required. Large-scale battery storage can thereby provide flexibility to the electricity system, support the integration of renewable generation and contribute to a more resilient energy infrastructure.

Bernhard Suchland, CEO of SUNOTEC, said:

“We have spent the past years building battery storage at a scale that would have seemed ambitious not long ago. Today, SUNOTEC has installed over 6 GWh across Europe. What we have learned there is simple: storage works, and Europe needs much more of it. Stendal is our opportunity to bring that experience to Germany as it represents exactly the kind of infrastructure that will become increasingly important as Europe builds an energy system with significantly more renewable generation. And for SUNOTEC, Stendal is only the beginning.”

Project milestone marked in Stendal

On 27 August, SUNOTEC marked the official project launch at the future battery storage site in Stendal, bringing together 65 guests from politics, the energy sector, project partners and the local community.

Among those attending were Thomas Wünsch, State Secretary at the Ministry of Science, Energy, Climate Protection and the Environment of Saxony-Anhalt; Bastian Sieler, Lord Mayor of the Hanseatic City of Stendal; representatives of Avacon and WT Energiesysteme; and senior representatives of SUNOTEC and other project partners.

During the ceremony, speakers highlighted the growing importance of large-scale battery storage for Germany’s energy system and the significance of continued investment in energy infrastructure in Saxony-Anhalt. The event concluded with a symbolic project launch at the future storage site.

From development to delivery

The Stendal project reached Ready-to-Build status within the SECURSUN framework, the joint venture between SUNOTEC and securenergy. As the project enters implementation, SUNOTEC is leading the delivery of the storage infrastructure.

WT Energiesysteme GmbH is constructing a new 110 kV substation at the site, providing the infrastructure needed to connect the battery storage system to the grid.

The project combines SUNOTEC’s experience in engineering and delivering large-scale renewable energy and storage infrastructure with its capabilities in the long-term management of integrated energy assets.

A German version of this press release is available.