REGIOlink is our operating and connection concept for the regional, grid-supportive integration of large-scale battery storage systems. Battery storage is often criticized for reacting solely to national price signals without taking local grid conditions into account. This is precisely where REGIOlink comes in: We analyze the specific grid reality on site, model available flexibilities and, together with the grid operator, develop a coordinated operating strategy. A tailored Flexible Connection Agreement (FCA) is an integral part of this approach — ranging from highly dynamic to standardized models. REGIOlink demonstrates that battery storage can be operated economically — while actively contributing to grid stability at the same time.

REGIOlink creates the foundation for an economically viable and simultaneously grid-supportive storage operation. The objective is to integrate battery storage systems into each respective grid area not as an additional burden, but as a source of flexibility. For grid operators, this means: • Greater predictability • Transparent operating logic • Reduced integration uncertainty • Individually tailored connection solutions • REGIOlink connects market mechanisms with regional grid requirements.

REGIOlink is designed for distribution system operators and grid operators who aim to integrate battery storage in a structured, predictable and grid-supportive manner. The concept is flexibly scalable: • For larger, digitalized grid areas with dynamic interfaces • As well as for smaller grid areas using standardized FCA models REGIOlink is not an off-the-shelf product, but a partnership-based integration approach.

REGIOlink is built on four core components: Grid Analyses and Flexibility Calculations Analysis of historical feed-in and load data, identification of critical time windows, and modeling of realistic operating cases. Tailored FCA Models Development of an appropriate Flexible Connection Agreement — dynamic, partially dynamic, or standardized — aligned with grid structure and level of digitalization. Operational Experience from Live Operation Use of real operating data from existing projects to validate and continuously optimize the models. Scientific Foundation Studies, modeling and system-level analyses as the basis for well-founded decision-making. The result is a clearly defined, contractually and technically aligned framework for predictable and reliable storage integration.

Our REGIOlink FCA portfolio includes: REGIOlink Dynamic For digitalized grids with real-time or rule-based power control. REGIOlink Sun For PV-dominated grid areas characterized by typical midday surpluses. REGIOlink Wind For wind-driven grid structures with high volatility. REGIOlink Industry For industry-dominated grids with high baseload demand and load peaks. We have already successfully implemented several FCA agreements — including with AllgäuNetz, Lechwerke Verteilnetze and VWEW-energie — building on established technical and contractual structures.

The additional effort is minimal. We take responsibility for: • Modeling and calculations • Technical design • Contract structuring • Operational coordination The grid operator contributes their in-depth knowledge of the network and defines their requirements — we translate this into the appropriate connection and operating model.