400-MW Battery Storage System Connected to the Transmission Grid

June 30, 2026

Source: E & M powernews

The British company Eku Energy plans to build a 400-MW battery storage facility with a capacity of 1,600 MWh in Lower Saxony. It would be one of the largest in Germany.

The “Dion” battery park is to be built in the Lower Saxony municipality of Lamspringe and connected directly to the transmission grid. Thanks to its grid-forming properties and black-start capability, it will help stabilize the grid and restore power supply following a widespread outage, according to a statement from Eku Energy. The project is in an advanced stage of development, with commissioning planned for late 2029, the statement said.

According to Eku Energy, the company acquired “Dion” from the German project developer Nion and signed a contract with Nion for its further development. Under the agreement, Nion will be responsible for implementation through financial close, while Eku Energy will take over strategic management in the areas of development, design, and technology. According to Eku Energy, the project is the first step in a long-term strategy for Germany. The company also plans to open an office in Germany.

“Our particular strength lies in combining technological expertise with solid marketing experience. In our multi-use projects, for example, we combine long-term power purchase agreements with participation in electricity exchanges,” explained Erin Lee, Chief Financial Officer of London-based Eku Energy. Expertise in contract structuring and storage technology ensures greater revenue stability and improved predictability for the projects.

Author: Günter Drewnitzky