FAQ

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.

Municipal utilities can act as project partners, landowners, grid operators, or investors in battery storage projects. Depending on the model, long-term partnerships can be established that create shared regional value. https://www.youtube.com/watch?v=pSh94_natKQ

Large-scale battery storage systems open up new business models, strengthen regional energy infrastructure and support the integration of renewable energy. At the same time, they contribute to grid stability and enhance security of supply. In collaboration with green flexibility as developer and operator, expertise can be shared and complemented.

The collaboration begins with the joint identification of suitable sites and grid connection points. A project model is then developed and implemented, and the storage system is operated and commercialized on a long-term basis. Key components such as FCAs – i.e., agreed operating strategies with the grid operator – as well as additional contractual arrangements are covered based on the experience gained from our existing projects.

Yes. Depending on the project structure, various participation models are possible – ranging from joint project companies to customized partnership solutions. The goal is a long-term collaboration that is economically viable and beneficial for both parties. Batteriespeicher: Flexibler Anschluss statt starrer Grenzen(https://www.zfk.de/energie/strom/batteriespeicher-netzanschluss-fca-stromnetz-vwew-green-flexibility)

It depends on the respective cooperation model. Projects can either be fully developed and operated by green flexibility or implemented jointly with the municipal utility as a partner or investor.

Large-scale battery storage systems are designed for long-term operation, typically over 20 to 30 years. Accordingly, partnerships with municipal utilities are structured as long-term collaborations.

Battery storage projects vary from 10 to 250 MW in terms of power. The greater the storage capacity, the larger the project area must be. This can vary depending on the plot size and access route. A rough rule of thumb for project areas is around 100m² per MW (for 2h storage facilities). An example of this is a project in Immenstadt where approx. 15 MW are installed and operated on just under 1560 m² of land. The small space requirement compared to other renewable plants and the natural integration into the environment maximizes the contribution to the energy transition.

A battery storage system consists of battery containers, inverters and a compact transfer station. The battery modules or cells are located in 20-foot shipping containers. The ground is graveled, the site is fenced in and landscaped with hedges. https://static.wixstatic.com/media/bbda69_b3c4ea43979142dea10154b1bb77732c~mv2.png (Example project on medium voltage)

The building law requirements for battery storage systems can vary depending on the location and scope of the project, but in many cases they are considered privileged construction projects. This means that, under certain conditions, they may be erected outside of building areas designated in the land use plan. E.g. in (agricultural) outdoor areas. (in Germany) Why are battery storage systems privileged? Battery storage systems serve the public energy supply and make a significant contribution to stabilizing the electricity grid. As a result, they fulfill a function of overriding public interest and can be given privileged treatment under building law in a similar way to wind power or solar installations.

Function The main difference between storage systems and wind farms and PV systems is their function. While PV and wind power are aimed at generating electricity, storage systems ensure that the electricity can also be stored for later use so that no electricity is lost. Storage systems are therefore a necessary addition to the expansion of renewables. Necessity Instability in the electricity grids due to the expansion of renewables is creating a bottleneck in the energy transition. Decentralized large-scale storage systems provide the necessary flexibility! According to the Federal Network Agency: “For a clean, reliable and economical energy future, we need 20x more flexible power in the electricity grid.” Prof. Dr.-Ing. Christof Bauer, Professor of Energy Economics at TU Darmstadt in Plusminus, ARD, September 18, 2024: “There would have to be a situation where the installation of a fluctuating generation plant is coupled with the requirement to install storage, and intelligent storage at that.” Land consumption / impact With our storage systems, we not only provide flexibility, but can also reduce electricity costs for citizens. As a result, we have a 100 times greater impact on the energy transition than, for example, simply building a ground-mounted PV system.

OPPORTUNITIES FOR YOUR COMMUNITY TRANSPARENCY INSTEAD OF NON-TRANSPARENT CORPORATE CONSTRUCTS We establish a local company in the community, ensuring long-term, predictable business tax revenues. LONG-TERM VALUE CREATION INSTEAD OF SHORT-TERM PROFIT AND FALSE PROMISES Our values are based on trust, partnership and responsibility: we run our own long-term operations and stand for smooth partnerships at eye level on site. LONG-TERM PROJECT SECURITY INSTEAD OF RUINED BUILDINGS OR STRANDED ASSETS We operate for decades and remain responsible. We source directly from the market leader and can guarantee the best technology with the highest quality. ACTIVE COLLABORATION WITH LOCAL GRID OPERATOR à We are the first operator to work with local grid operators to actively support the regional grids.

“We have come to stay” - This means that green flexibility is not only a project developer, but also the long-term operator of the storage projects. We therefore do not sell storage facilities or projects. We take care of every step of the project, from planning and construction to the long-term operation of the storage facilities. For this reason, we also have high standards for our project and product quality.

Basically, it depends on the cell chemistry used, the design and the installed standards. Our battery storage systems have been tested by independent institutes and certified as safe. The cell chemistry used with iron phosphate technology is classified as safer. Various standards and regulations in the area of fire protection are met and exceeded. Thanks to the cell chemistry used and the sophisticated setup, fire and the spread of fire are largely prevented, so that the batteries merely “smoke out”. To this end, the battery containers are equipped with no-propagation technology, which effectively prevents the spread of fire to other cells in the unlikely event of a fire. In addition, our storage systems meet all relevant and listed EU and international standards.

Large scale battery storage are very environmentally friendly in their design and function. They emit neither odors nor pollutants and are also equipped with drip pans to prevent the leakage of water-polluting substances into the groundwater supply in the event of a fault. The battery storage facility will be integrated into the natural environment and planting with local hedges and trees is planned, especially at the edge of the area.

Proximity to the substation is important in order to be able to use the existing infrastructure for the grid connection and to avoid losses due to excessively long cables. In addition, substations are often installed at key nodes in the power grid and are therefore critical for the power supply. Installing a battery storage system at such a hub can ensure a constant power supply to the surrounding communities and protect against power shortages and outages

1. identify suitable substations and areas 2. contact the municipality and the landowners 3. obtain powers of attorney for the further planning steps from the landowners 4. submit a grid compatibility assessment (NVP) to the responsible grid operator 5. start the construction planning process (building law, building permit, etc.)

Ideally, sites should be located within a radius of around 1 km from transformer stations. Smaller projects can be successfully realized from an area of 800 m². Agricultural as well as commercial or industrial sites are suitable. Thanks to the privileged status, projects can be implemented on almost any type of land in agreement with the local authorities.