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Entrix will commercialize a 6.35 MW battery storage system for Suntec, a developer of solar and energy systems. For the project, Entrix has also set up a structured offtake solution via a Power Storage Agreement (PSA) in collaboration with DB Energie.
The asset combines a 5.8 MWp photovoltaic system and a 6.35 MW battery storage system, sharing a single grid connection point. While the PV system primarily feeds into the grid, the battery storage system utilizes the remaining grid connection capacity. The two systems operate in a naturally complementary manner: the battery charges during periods of high PV generation and low prices, and exports energy to the grid during periods of lower generation and high prices. This allows the grid connection to be used efficiently while unlocking additional flexibility. The project is among the first in Germany to combine grey co-location with a structured offtake solution, demonstrating how battery storage systems can be profitably integrated into existing PV infrastructure.
Structured commercialization in the day-ahead market with DB Energie
A central component of the project is the collaboration with DB Energie, a wholly owned subsidiary of Deutsche Bahn. As part of the Entrix FloorPlus model, DB Energie contracts the project's day-ahead flexibility for ten years, providing Suntec with fixed payments for predefined capacities. Based on the PSA, DB Energie receives access to the project's flexibility on a day-ahead basis, in order to stabilize its own renewable portfolio. The operator receives a stable revenue stream that provides greater predictability and ultimately facilitates financing.
“Without the right commercialization, flexibility remains unused. Our approach combines predictable revenues with active market participation, thereby creating the foundation for the bankability of battery storage projects – a key prerequisite for scaling investment in flexibility and driving forward the integration of renewable energy.”
“For us, the efficient use of existing infrastructure is paramount. The grey co-location approach allows us to optimally utilize the grid connection point while simultaneously increasing the overall project’s economic viability through additional flexibility.”
“For us, this partnership is a key element in expanding and diversifying our PPA portfolio. Battery storage systems such as this one enable us to use green electricity from flexible and demand-oriented sources and support the integration of renewable energy into the energy system. In doing so, we are contributing to Deutsche Bahn’s journey toward climate neutrality by 2040.”