BNetzA amends EE grid-cost allocation methodology to refine estimation of renewable capacity in third-party downstream networks
ImplementationBNetzA's Beschlusskammer 8 adopted decision BK8-25-005-A on 2026-03-04, amending Tenorziffer 2 of the original 2024 EE-Netzkostenwälzung determination (BK8-24-001-A). The amendment replaces the prior approximation of installed EE (renewable) generation capacity in third-party, downstream network levels—previously based on time-non-simultaneous maximum back-feed load—with a new formula combining simultaneous maximum withdrawal load and simultaneous maximum back-feed load, subject to a floor (zero if back-feed is zero) and a ceiling (capped at the actual installed EE capacity per the Marktstammdatenregister register). The change takes effect 2027-01-01, replacing the prior rule as of 2026-12-31, and applies first to the 2027 wälzung reporting cycle (deadline 2026-10-15). BNetzA has scheduled an implementation workshop for 2026-08-27.
This methodological change affects how German distribution network operators calculate their 'Erneuerbare-Energien-Kennzahl' (EE-Kennzahl/EKZ), which determines eligibility for and the size of cost compensation for excess grid costs caused by renewable energy integration, ultimately passed through to end consumers via network tariffs. A more precise estimator changes which network operators cross the EKZ>2 threshold and how much cost socialization ('Wälzung') occurs between distribution networks and transmission system operators, directly impacting network tariff allocation across Germany's highly fragmented multi-level grid structure with many upstream/downstream operator relationships.
While not a traditional wholesale or balancing market design change, this decision reshapes a quasi-market cost-allocation mechanism embedded in German network regulation that redistributes renewable-integration costs among network operators and ultimately into retail electricity prices. The shift from a single approximate variable (asynchronous back-feed load) to a two-variable formula with a Marktstammdatenregister-based ceiling improves accuracy (reducing systematic underestimation for downstream renewables-heavy networks) but increases operational reporting burden on upstream network operators, particularly those with many (sometimes 100+) downstream third-party network connections. The consultation (Sept-Oct 2025) revealed near-universal stakeholder support for the methodological refinement itself, but flagged transparency concerns about underlying economic analysis and calls to align the cost-wälzung mechanism with the broader AgNes grid-fee reform process before the current legal basis (Section 29 EnWG determination) is set to lapse at end-2028. The staggered effective date (2027-01-01) and specific reporting deadline (2026-10-15) give operators a transition window, and the mandated 2028 evaluation signals this is an interim technical fix pending a more structural approach to renewable network cost allocation.
§29 Abs. 1 and 2 EnWG in conjunction with §21 Abs. 3 S.4 Nr. 3 h) and i), S.5 EnWG; original determination BK8-24-001-A of 28.08.2024; amendment BK8-25-005-A of 04.03.2026; related provisions under ARegV and StromNEV
Public online workshop on implementation of the amended EE-Netzkostenwälzung determination and first billing via the regulatory account · 27 Aug 2026