Consistent definitions help – for an optimized grid connection process

In particular, the term grid-supportive is being heavily overused. Our goal is not so much to discuss terminology, but rather to focus on concepts and solutions.

Battery storage systems are considered an essential element of the energy transition – and rightly so. But the reality is more complex: The current boom in grid connection applications shows that, while storage systems are on trend, new challenges are emerging. One example: At the beginning of 2025, transmission system operator Amprion had received over 230 connection requests totaling 75 GW – by March, industry platform PV Magazine estimated a nationwide volume of 340 GW. Many of these projects will never be realized but still block valuable grid and workforce capacity. What’s lacking are clear criteria for what makes a storage system “good” in terms of the grid – and clear definitions of terminology.

“Grid-supportive” – a term without a compass

The term "grid-supportive" is omnipresent. But what does it actually mean? In practice, it is used frequently, but a consistent definition is missing. Terms like grid-neutral, grid-compatible, system-supportive, or market-driven are often used vaguely or even synonymously. This leads to misunderstandings and complicates the development of clear requirements for battery storage systems.

What is needed: a shared understanding of these terms – and clear distinctions for when a storage system supports the grid, when it simply does not harm it, and when it potentially contributes to grid stress.

Together with the FfE, we have scientifically examined these definitions. As part of the white paper “Grid-Compatible Expansion of Large-Scale Battery Storage – Practical Approaches from the Field”, key terms such as grid-compatible, grid-supportive, and grid-neutral have been scientifically analyzed, structured, and clearly differentiated. Numerous interviews with grid operators were conducted.

Based on these findings, we have developed a practice-oriented concept for grid operators to optimize regional storage operation and reduce the effort required on the part of grid operators. We are taking it one step further and actively seeking concepts and solutions!

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