Battery Energy Storage System Germany: SUNOTEC’s 441 MWh Project
September 1, 2026 — SUNOTEC has moved a major 100 MW / 441 MWh standalone battery energy storage system into construction in Stendal, Saxony-Anhalt. The project is set to rank among Germany’s largest battery storage systems when completed and marks a significant step in the company’s European expansion.
Project Overview: 100 MW / 441 MWh Standalone BESS
The standalone battery energy storage system will deliver 100 MW of power and 441 MWh of storage capacity. This equates to roughly four hours of full-power discharge, allowing the system to absorb surplus electricity and release it when demand rises.
The project reached Ready-to-Build status in the second quarter of 2026. SUNOTEC is acting as full-turnkey provider, covering engineering, procurement, construction, and long-term operations and maintenance.
Grid connection is secured through a new 110 kV substation currently under construction by WT Energiesysteme GmbH. This infrastructure will link the Stendal Batteriespeicher directly to the regional network operated by Avacon.
Why This Project Matters for Germany’s Energy Transition
Germany continues to add large volumes of wind and solar generation. Flexible resources are essential to keep the grid stable. A battery energy storage system Germany of this scale can store excess renewable power during high-production periods and supply it during evening peaks or low-wind stretches.
Saxony-Anhalt has emerged as a hotspot for utility-scale storage. Several major projects are under development or construction in the state, reflecting strong local grid capacity and political support for energy infrastructure. The Stendal installation adds meaningful capacity without claiming the absolute top rank among systems already in the pipeline.
Large-scale batteries help reduce curtailment of renewables, lower price volatility, and improve overall system resilience.
SUNOTEC’s European Track Record
SUNOTEC brings substantial experience to the German market. The company has already installed 6.1 GWh of battery energy storage capacity across Europe. That track record underpins its decision to expand further into Germany, where demand for flexible assets is rising quickly.
CEO Bernhard Suchland underlined the strategic importance of the move:
“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.”
Source: SUNOTEC
The SUNOTEC BESS approach combines proven engineering with long-term asset management, positioning the company as more than a pure construction contractor.
Official Launch Ceremony in Stendal
On 27 August 2026, SUNOTEC hosted an official project launch at the future storage site. Approximately 65 guests from politics, the energy sector, project partners, and the local community attended.
Key participants included:
- 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 from Avacon and WT Energiesysteme
- Senior executives from SUNOTEC and partner companies
Speakers highlighted the growing role of large-scale battery storage in supporting Germany’s energy system and the value of continued investment in Saxony-Anhalt. The ceremony closed with a symbolic project launch at the site.
Delivery Partners and Timeline
The Stendal project was developed under the SECURSUN joint venture between SUNOTEC and securenergy. As the project enters the construction phase, SUNOTEC leads delivery of the full storage infrastructure.
Key timeline points:
- Ready-to-Build achieved: Q2 2026
- Construction underway: August 2026
- Planned commissioning: Q1 2027
Next steps include completion of the 110 kV substation, installation of battery containers and power conversion systems, and progressive testing ahead of commercial operation.
Benefits of Large-Scale Battery Energy Storage Systems
Utility-scale batteries deliver clear system-level value:
- Store surplus renewable power when generation exceeds demand
- Provide rapid flexibility to balance the grid within seconds
- Enhance resilience against weather-driven variability in wind and solar output
- Support Germany’s renewable targets by enabling higher shares of clean energy without compromising security of supply
The 441 MWh BESS in Stendal will contribute to all of these functions once operational. As more such projects come online, the German power system gains the tools needed to manage an increasingly renewable-dominated generation mix.
Stay updated on Renewable Storage News for further developments on this and other major European battery projects.
I'm Amelia Bonner, an energy storage researcher and technical content writer focused on the technologies shaping the future of reliable, flexible, and sustainable energy systems. My work explores battery energy storage, grid-scale storage, renewable energy integration, battery technologies, and emerging energy storage solutions.
