Vattenfall and Fluence Energy, Inc. have signed an agreement for the delivery of the planned battery storage facility in Brunsbüttel, along with long-term service support.

Award Marks Vattenfall's Largest Battery Project to Date

With an output of 254 MW and a storage capacity of over 1,000 MWh, the project is expected to be among the largest battery energy storage projects in Germany and represents Vattenfall's largest battery project to date.

The facility is planned to be built at the site of the Brunsbüttel nuclear power plant, which is currently being decommissioned. The project is scheduled to become operational by the end of 2028.

Turnkey Delivery Using Fluence's Gridstack Pro Platform

The 4-hour storage facility will utilize Fluence's Gridstack Pro 5000 platform, a large-scale battery storage solution that includes battery systems, power conversion equipment, and an energy management system designed to support grid resilience, renewable energy integration, and reliable system performance.

Fluence will deliver the project on a turnkey basis, covering engineering, procurement, construction, commissioning, and long-term service support. According to the announcement, this scope is intended to help ensure the facility operates at high performance throughout its entire lifetime.

Strategic Context: Germany's Leading Storage Market

Germany is currently the leading battery energy storage market in Europe, adding 6.6 GWh in 2025, according to SolarPower Europe.

Growth in the German battery storage market is being driven by the rapid expansion of wind and solar power, increasing electricity-price volatility, declining technology costs, and the ability of storage assets to combine revenues from energy trading and grid services.

Demand for utility-scale battery storage continues to grow across Germany and Europe. As wind and solar capacity expands, the need for flexible technologies capable of balancing supply and demand in real time is increasing, according to the announcement.

Executive Commentary

Claus Wattendrup, Head of Solar & Batteries at Vattenfall, said projects like the Brunsbüttel battery storage facility play an important role in strengthening the resilience of the energy system and enabling the continued integration of renewable power generation.

"Together with Fluence as our long-term partner, we are creating a flexible asset that can respond to changing electricity market needs for many years to come. The project will further strengthen our portfolio of flexibility solutions and support the transition away from fossil fuels," Wattendrup said.

Julian Jansen, VP & Managing Director of Fluence Germany, noted that the company's long-standing relationship with Vattenfall now spans eight projects across three European countries.

"Having delivered more than 20 battery energy storage projects in Germany, Fluence is proud to be a leader in scaling battery storage as critical energy infrastructure in the country," Jansen said.

Timeline and Grid Connection

Construction of the project is expected to begin in 2027. Commissioning of the battery storage facility and its grid connection to the 50 Hertz 380 kV transmission network is planned for the end of 2028.

The Brunsbüttel battery project is described as a key component of Vattenfall's flexibility strategy and will nearly double the company's existing battery storage capacity.

About the Companies

Vattenfall is a European energy company with approximately 21,000 employees that has supplied energy for more than 100 years and is committed to building a future where everyone can choose fossil-free ways to move, make, and live.

Fluence Energy, Inc. (Nasdaq: FLNC) is a global market leader delivering intelligent energy storage and optimization software for renewables and storage. The company has gigawatts of projects contracted, deployed, and under management across nearly 50 markets.

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