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The world’s largest grid battery storage project  

Germany’s Kupferzell Grid Booster adds 250 MW per hour of storage capacity, stabilizing the transmission grid and advancing the energy transition. 

Client

Fluence Energy

Location

Kupferzell, Germany

Practices

Mechanical, Electrical and Plumbing (MEP)Construction

Markets

Electric and Gas Utilities

Priorities

Energy and Power

Connect with an expert

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Matt Goss PE, PMP, CEM, CEA, CDSM, LEED AP (BD+C)
Energy and Power Leader

Setting new standards in grid stability and sustainability 

CDM Smith is building the world’s largest grid battery storage system in Kupferzell, Germany. With 250 MW per hour output and spanning 34,000 m², the facility will cut transmission costs, optimize power line use, and stabilize the grid within milliseconds. Involved since planning, CDM Smith provides execution and construction services, supported by a 3D BIM model. Trial operation took place in 2025, reinforcing Germany’s leadership in sustainable power and resilient grid systems. 

Delivering largest grid battery capacity  

250 MW per hour output sets a global benchmark in storage, ensuring resilience and efficiency for Germany’s transmission grid. 

Applying advanced BIM modeling 

Digital 3D models enhance planning, execution, and refinement, ensuring accuracy and efficiency throughout the construction process. 

Meeting construction milestones

An early construction start got groundworks and general site development moving quickly, moving the project toward trial operation. 

Contributing to energy transition  

The project strengthens Germany’s sustainability goals, reducing reliance on traditional systems and supporting renewable integration. 

The Kupferzell Grid Booster demonstrates CDM Smith’s role in advancing Germany’s national energy transition. “We are very proud to be able to make such a significant contribution,” said Lukas Wallrabe, deputy head of business development in Germany. In 2023, the project received the prestigious ICPMA Sustainability Award, recognizing excellence and innovation in project management.  Together with Fluence Energy, the project team is setting new standards for grid stability, efficiency, and resilience, ensuring longterm benefits for Germany’s power system and its communities. 

Curious to learn more?

Connect with an expert to find out how we delivered this project.

Goss_Matt_2023.jpg

Matt Goss

Energy and Power Leader

The driving force behind CDM Smith’s energy and power team. Matt spearheads the strategic development and execution of high-impact projects in mechanical, electrical, plumbing, fire-protection and energy sectors. With a keen eye for innovation, he collab­o­rates with global colleagues to identify top-tier technical resources, craft cutting-edge project approaches and implement state-of-the-art digital and technology solutions.

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