Germany's Federal Ministry for Economic Affairs and Energy (BMWE) has released a draft amendment to the Renewable Energy Sources Act (EEG) slated to take effect on 1 January 2027, placing battery energy storage systems at the center of the country's next phase of energy transition. The reform shifts Germany's renewables support framework from fixed feed-in tariffs toward market-based mechanisms, while introducing new structural incentives for co-located and utility-scale storage - changes with broad implications for project economics, grid stability, and Europe's industrial supply chain.
Background
The EEG 2027 draft arrives as Germany's electricity system faces mounting pressure from two directions. The EU's state aid approval for Germany's current EEG 2023 framework expires on 31 December 2026, forcing a structural redesign of the subsidy regime. At the same time, the BESS pipeline has grown to a scale that strains the physical grid itself. Grid connection applications surged past 720 GW by 2025, of which only 78 GW hold confirmed connection commitments.
By September 2025, Germany's four transmission system operators (TSOs) had accumulated 211 GW of battery storage connection requests - five times the 41 GW the official grid development plan anticipated for 2037. Despite this pipeline pressure, the installed utility-scale base remains thin. Only approximately 2.5 GW of utility-scale BESS was connected to the German grid by end of 2025, according to industry estimates, against total installed battery capacity - including residential systems - of 17.9 GW / 27.2 GWh as of March 2026.
Reform Details
The EEG 2027 draft aims to make renewables expansion more planned, cost-efficient, grid-compatible, and market-oriented, moving away from long-standing subsidy models toward a more integrated system. In accordance with EU requirements, the current subsidy system based on bilateral contracts for difference (CfDs) is to be further developed and the fixed feed-in tariff for new installations abolished.1An industrial blueprint for batteries in Europe | T&E
A central storage-related mechanism is a new permanent cap on solar feed-in for smaller installations. The draft limits feed-in power to 50% of installed capacity, creating a strong incentive for operators to install battery storage - allowing them to capture solar generation during midday peaks and feed it into the grid during evenings when demand and electricity prices are higher.
For co-located BESS, the reform amends Section 19 EEG to optimize flexible usage options for battery storage projects. BESS operators will be able to choose between options including exclusive storage and feed-in of renewable electricity only, or a mixed-use differentiation model.
On grid access, Germany's four TSOs moved ahead of the EEG deadline. Effective 1 April 2026, the TSOs introduced a maturity-based procedure (the Reifegradverfahren) for allocating grid connection capacity to large-scale storage projects, replacing the previous "first come, first served" approach.
Industry associations have raised concerns about what the draft omits. Key instruments promised in the coalition agreement are absent, including regulations on physical direct supply, regional electricity supply models, a market framework for power purchase agreements, citizen energy, and energy sharing. Calls across sectors urge combining the EEG amendment with the planned grid package and grid fee reform, warning that without a coherent overall framework, financing costs risk rising.
The grid fee regime adds further complexity. Battery storage systems commissioned by 4 August 2029 qualify for a full 20-year network tariff exemption under current law, but the Federal Network Agency (BNetzA) has recently signaled that this exemption could be curtailed earlier than planned - potentially affecting assets already in operation - drawing strong criticism from industry representatives.
European Supply Chain Context
The EEG 2027's storage push intersects with a broader European industrial policy challenge. Even amid rising 2025 production output, import values into Europe climbed 17% year-on-year, with imports from China alone jumping 27%. Unit prices of Chinese batteries imported into the EU declined approximately 17% between December 2024 and August 2025, intensifying competitive pressure on European manufacturers.
At the EU level, the European Commission proposed the Industrial Accelerator Act in early March 2026, introducing strict "Made in EU" requirements for EV battery cells and key components to reduce dependence on external suppliers, particularly mainland China. The EU's Net-Zero Industry Act includes a non-legally binding objective of reaching EU battery manufacturing capacity of at least 550 GWh by 2030.
Outlook
In 2026, Germany will launch tenders for 10 GW of gas-fired capacity and 2 GW of "technology-neutral" capacity explicitly including BESS, with a full capacity market design targeted for 2027. If the current BESS deployment rate of 1 GW of additional capacity every six months continues, Germany could exceed 12 GW of installed grid-scale BESS capacity by 2030.
The EEG 2027 draft has yet to be approved by the government or debated in the Bundestag, and must also be re-notified at the EU level before the December 2026 deadline. Developers and investors face a compressed legislative timeline in which several interlocking frameworks - the EEG reform, the grid package, the capacity market design, and the post-2029 grid fee structure - must all be resolved in parallel.
