Entrix to optimize Germany’s first PV-plus-battery ‘grey’ co-location project
Entrix has agreed to provide market optimization and AI-based trading services for a solar-plus-storage project developed by Suntec in Germany. The project combines a 5.8 MW solar plant and a 6.35 MW battery energy storage system (BESS) connected through a shared grid connection point.
The battery will operate as a “grey” storage asset, meaning it can charge from both the co-located solar plant and the electricity grid. According to Entrix, the configuration allows the solar installation to retain priority access to the grid connection, while the battery uses any remaining capacity.
Under the operating model, the battery will charge during periods of high solar generation and lower electricity prices, then discharge when renewable output falls and market prices increase. Entrix said the approach is designed to maximize use of the grid connection while providing additional system flexibility.
The project also includes a structured offtake arrangement with DB Energie, the energy subsidiary of Deutsche Bahn. Under a 10-year power storage agreement (PSA) based on Entrix’s FloorPlus model, DB Energie will secure day-ahead access to a defined portion of the battery’s flexibility in exchange for fixed capacity payments.
Entrix said the arrangement will provide Suntec with predictable revenues and support project financing. Any battery flexibility not called upon by DB Energie will be optimized and marketed by Entrix across relevant electricity markets.
Entrix CEO Steffen Schülzchen said combining fixed revenues with active market participation can improve the bankability of battery storage projects and help scale investment in flexibility assets needed to support renewable energy integration.
For Suntec, the project is intended to maximize the value of existing grid infrastructure. Managing Director Florian Golinski said the grey-storage configuration enables more efficient use of the grid connection while improving the overall economics of the combined solar and storage asset.
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