The AgNes framework determination by the Bundesnetzagentur (BNetzA) is entering the next round. With the upcoming expert exchange, the design of grid fees for battery storage is further taking shape. For the storage market, for BESS projects, and for project financing, this is more than a regulatory topic — it directly influences business cases, valuations, and investment decisions.
What Is Emerging: Some Effects Are Already Priced In
Our market assessment: Some of the economic effects from the debate around grid fee exemption and future grid fee regulations for battery storage are already priced in. Many market participants have begun to factor regulatory uncertainty into model assumptions and return requirements.
At the same time, one point looms that could significantly intensify the dynamics: the discussed "quasi-retroactive effect."
"Quasi-Retroactive Effect": Risk for Planned and Developed Storage Projects
The discussed quasi-retroactive effect could lead to grid fee advantages being restricted or eliminated even for already planned or developed projects — even if these effects were already factored into the business case.
This shifts investment and valuation logic in the storage market. Not only new projects, but also ongoing developments are being reassessed because central assumptions about revenue and cost structures may change.
What We Hear in the Market: Valuation Logic Is Shifting
In conversations with investors and developers, we repeatedly hear three points:
- Grid fee exemption is not automatically assumed as a reliable assumption
- Expected returns react noticeably to regulatory uncertainty
- Blanket risk premiums are being discussed
This makes it decisive which BESS projects can economically absorb regulatory adjustments — without financing, valuation, or feasibility tipping over.
Our Preference: Flexible Grid Fees Instead of Blanket Charges
In our view, the reform should not result in blanket charges, but should consistently incentivize grid-serving behavior.
Time- and grid-condition-dependent grid fees address exactly this:
- They price actual grid bottlenecks instead of blanket grid usage
- They create a monetizable price signal
- They enable storage to actively avoid bottlenecks
This addresses a core point: Storage can act in a grid-serving manner — but this requires a price signal that makes system-serving behavior economically attractive.
Research: Dynamic Grid Fees and Redispatch
Studies (including Eco Stor / Neom) show that dynamic grid fees can reduce redispatch needs and lower grid expansion costs — while simultaneously providing tradeable revenue prospects for BESS operators.
Why This Matters: Renewable Energy Integration Needs Flexibility
Battery storage is one of the most effective instruments for integrating renewable energy. What has been missing is the economic incentive to act in a system-serving manner.
This is precisely where the opportunity of the AgNes reform lies: designing grid fees so that flexibility is rewarded — and not treated as a blanket cost block.
