Brief Study: Impact of Grid Operator-Imposed Operating Restrictions on Utility-Scale Battery Storage
- 9 hours ago
- 2 min read
[Led by BET, in collaboration with IAEW – commissioned by green flexibility]
19 November 2025
The rapid deployment of utility-scale battery storage is currently driving a sharp increase in grid connection requests — a clear sign of how quickly flexibility is expanding across the power system. For grid operators, this also creates the challenge of allocating grid capacity efficiently while gaining a better understanding of how battery storage systems affect the grid, both today and in the future. As practical experience in this area remains limited, new technical and operational questions are increasingly coming into focus.
To safeguard grid stability and integrate the growing number of battery storage projects in a structured way, many grid operators are introducing operating requirements as part of Flexible Connection Agreements (FCAs). These may include static or dynamic power limits, requirements for active power ramp rates, limits on marketable balancing power, or advance scheduling requirements. They go beyond existing technical grid connection requirements and influence both the commercial strategy of battery storage systems and how flexibility is provided across the power system — and therefore also how efficiently renewable energy can be integrated.
For green flexibility, the objective of this brief study is therefore clear: to give equal consideration to the perspectives of grid operators, energy traders and battery storage operators, and to establish a shared understanding of the underlying mechanisms. Only in this way can future instruments be developed that safeguard grid stability while preserving the economic value of flexibility for society as a whole.
“We want to be part of the solution. To achieve this, all market participants need to understand each other’s perspectives. That is why our approach is based on constructive dialogue, in which we jointly assess the impact of different instruments and develop the best solutions,” says Christina Hepp, Director Strategy at green flexibility. “With REGIOlink, we developed an initial concept at an early stage and have already implemented it operationally in the market.”
Analysis of Specific Cases Paints a Clear Picture
The quantitative analysis clearly shows that operating restrictions can reliably ensure grid neutrality. However, the way these restrictions are designed is a key factor in determining the extent to which they simultaneously affect flexibility, market liquidity and the economic viability of battery storage systems.
The comparison of individual restriction scenarios illustrates this particularly clearly:
Static power limits result in 5,840 restricted hours per year in the grid area under consideration, while dynamic restrictions achieve an almost identical grid-planning effect with just 240 hours.
The impact on commercialisation is correspondingly different: static operating envelopes reduce battery storage revenues by around 25%, while dynamic requirements reduce them by only around 1%.
An unrestricted battery storage system (10 MW/20 MWh) can provide around 15 GWh of balancing power. Operating restrictions significantly reduce this potential — only slightly in the case of dynamic requirements, but substantially with static and blanket limits, in some cases down to around 50% of the original dispatch potential.
“The energy transition can only succeed through dialogue — we invite all stakeholders to use these findings as a basis for further joint development.”
The full study and a brief summary are available here:
