Germany's regulator plans to rule on 1 October on whether a subsidised home battery may charge from the grid
The household bought the battery and does not own the decision about when it runs, which is the distinction this publication exists to track. What has been standing in the way is not hardware, price or consumer appetite: it is an accounting rule about subsidy eligibility, and writing its replacement has occupied a national regulator for fourteen months. The flat-rate option is the one that decides the outcome, because nobody with a 10 kW roof will operate quarter-hourly apportionment formulae. If its standardised assumptions are set conservatively, as standardised assumptions usually are, Germany will have granted a right that almost nobody exercises.
The Bundesnetzagentur's page for its MiSpeL determination, for Marktintegration von Speichern und Ladepunkten, case number 618-25-02, states that the final text is currently planned for publication on 1 October 2026, with a workshop explaining it the following day. The agency's wording is conditional rather than committal: the determination "soll nach den aktuellen Planungen" appear on that date. [UNVERIFIED: that it is in fact published on 1 October 2026.]
The procedure has taken fourteen months. It opened on 31 July 2025 under section 85d of the EEG and section 62(2)(1) of the EnFG, both inserted by the law against temporary generation surpluses, which the agency's page names the Stromspitzengesetz and which German industry commentary more often calls the Solarspitzengesetz. [UNVERIFIED: the statute text was not read and the two names were not reconciled.] Drafts went out for consultation on 18 September 2025, an information workshop followed on 1 October 2025, submissions closed on 24 October 2025, and 52 responses arrived, among them E.ON, EnBW, the industry associations BDEW and bne, the storage manufacturers sonnen and ads-tec, and Volkswagen's charging arm Elli. A three-part working draft, a tenor plus two annexes, was published on 5 August 2026 so that the market could orient itself ahead of the final text.
What the determination replaces is an exclusivity rule that has kept subsidised German home storage effectively frozen in place. A battery sharing a grid connection with a subsidised renewable installation may store what that installation produced and very little else. The agency's own framing is that an operator today must pick between incompatible paths: take renewable electricity only and keep the EEG market premium, or charge from the grid and keep levy relief while forfeiting the premium on the installation. Charging points are excluded from intermediate storage altogether.
Two routes out are on offer, and they are not equivalent. The Abgrenzungsoption apportions eligible and ineligible volumes using formulae over quarter-hourly metered data. It is the precise route: it allows grid draw, grid feed-in and self-consumption to be optimised in parallel, with EEG support and levy exemption retained proportionally, and it requires metering infrastructure to match. The Pauschaloption is the flat-rate route, available to solar installations up to 30 kWp, which substitutes statutory assumptions and fixed boundaries for measurement; the agency says only minimal measurement effort is required under it. Under both routes charging points become eligible for support for the first time and are treated the same as storage, which is what opens the door to bidirectional use.
The fleet this reaches is not small. Figures from ISEA at RWTH Aachen, published through the Battery-Charts platform on 8 May 2026, put German installed battery storage at roughly 27.2 to 27.8 GWh across about 2.5 million systems at the end of March 2026. The domestic segment dominates by count rather than by capacity: of the 2.2 GWh added in the first quarter, about 1.04 GWh arrived as roughly 125,000 home systems, while 63 large-scale installations contributed about the same energy between them. [NEEDS DATA: how many of those systems sit inside the EEG support regime, and are therefore subject to the exclusivity rule at all.]
Why it matters. The household bought the battery and does not own the decision about when it runs. That is the distinction this publication exists to track, and here the thing standing in the way is not hardware, not price, and not consumer appetite. It is an accounting rule about subsidy eligibility, and writing its replacement has occupied a national regulator for fourteen months.
Within that, the flat-rate option is the one to watch, not the precise one. Nobody with a 10 kW roof is going to operate quarter-hourly apportionment formulae, or pay an intermediary enough to make it worth their while. If edge participation in Germany becomes real in practice rather than in principle, it will be because the 30 kWp simplification is both usable and worth using. If its standardised assumptions are set conservatively, as standardised assumptions generally are, the determination will have granted a right that almost nobody exercises. Both routes appear to be permissive rather than mandatory, which means the arithmetic inside Annex 2 decides the outcome, not the tenor. That is the document to read on 1 October, and it is the one least likely to be summarised accurately.
The charging-point provision deserves separate attention. Bringing Ladepunkte inside the support regime for the first time, on the same terms as storage, is the precondition for treating a parked car as grid-connected storage rather than as a load that happens to be plugged in. Until now the accounting has forbidden it outright: the agency's own description is that the use of charging points for intermediate storage is excluded entirely under the current rule.
What is still unknown.
Whether the flat-rate option leaves a typical household better off. [NEEDS DATA: realistic annual revenue for a 10 kWh home battery under the Pauschaloption.]
Whether existing installations qualify automatically or need new metering, contracts or registration. The agency's published material is prospective and says nothing about grandfathering or transitional provisions.
How far the final text moves from the 5 August 2026 working draft, and whether the 52 consultation responses were published.
What an owner does who takes the delineation option but whose meter cannot produce quarter-hourly data.
Sources.
Bundesnetzagentur, MiSpeL procedure page, case 618-25-02: https://www.bundesnetzagentur.de/DE/Fachthemen/ElektrizitaetundGas/ErneuerbareEnergien/EEG_Aufsicht/MiSpeL/start.html
Bundesnetzagentur, MiSpeL explanatory article: https://www.bundesnetzagentur.de/DE/Fachthemen/ElektrizitaetundGas/ErneuerbareEnergien/EEG_Aufsicht/MiSpeL/artikel.html
ISEA, RWTH Aachen via Battery-Charts, 8 May 2026, summarised by EMA Energiewelt on 13 May 2026: https://ema-energiewelt.de/wissen/batteriespeicher-rekord-q1-2026-grossspeicher-heimspeicher
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