Since 1 June 2026, distribution network operators in Germany have been legally required to enable Energy Sharing over the public grid. The legal basis, a new provision called Section 42c EnWG, actually entered into force back on 22 December 2025. For the first time, Germany has a standalone legal framework for a model that, until recently, existed mostly in policy discussion.
At the same time, the property sector is still working through two established models, Mieterstrom (tenant electricity) and Gemeinschaftliche Gebäudeversorgung (GGV, collective building supply), whose potential remains largely untapped. Of roughly 1.9 million apartment buildings housing 14.3 million rental units, only around 9,000 buildings had a tenant electricity system installed as of April 2024, according to the German Economic Institute (IW Köln).
For owners, asset managers, and property administrators, energy sharing is no longer one model. It is now three distinct legal categories, each with different scope, economics, and operational requirements. Understanding which applies where is now a genuine competitive advantage over operators still working from outdated 2024 assumptions.
Key figures: Energy Sharing in Germany (as of June 2026)
- § 42c EnWG in force since 22 December 2025
- DSO obligation to enable Energy Sharing since 1 June 2026
- Expansion to adjacent balancing areas from 1 June 2028
- German smart meter penetration, end of 2025: 5.5% (Austria: 95%)
- Mieterstrom bonus, 2026: roughly 1.5–2.67 ct/kWh, declining
- 9,000 of 1.9 million apartment buildings have a Mieterstrom system (as of 2024)
What Does Energy Sharing Mean in Germany?
Energy Sharing has had its own standalone legal definition in Germany since 22 December 2025, under Section 42c EnWG. It refers specifically to the joint use of renewable electricity across the public distribution grid. This is legally distinct from Mieterstrom and Gemeinschaftliche Gebäudeversorgung (GGV), both of which operate without using any grid at all and remain limited to a single building or a tightly connected cluster. Distribution network operators have been obligated to enable Energy Sharing within their balancing area since 1 June 2026.
This distinction matters in practice but is frequently blurred in older coverage of the topic. Mieterstrom and GGV have existed for years and stay confined to one building or a small group of physically connected buildings. Energy Sharing under Section 42c goes further: electricity moves across the standard distribution grid, which means it can reach consumers outside the property boundary entirely, as long as they sit within the same network area.
The new provision transposes Article 15a of the revised EU Electricity Market Directive into German law. From 1 June 2028, the geographic scope expands further to include directly adjacent balancing areas within the same control zone.
What Is Mieterstrom and How Does It Work Today?
Mieterstrom supplies rooftop solar electricity directly from a multi-family building to the tenants living there, without routing it through the public grid. The landlord or a specialist provider earns the Mieterstrom bonus under Section 21(3) EEG, which in 2026 ranges from roughly 1.5 to 2.67 cents per kWh depending on system size and declines slightly every six months. Tenants pay no more than 90% of the local standard utility tariff and can switch providers at any time.
The economics rest on three sources: the Mieterstrom bonus itself, the standard feed-in tariff for any surplus electricity that isn't consumed on-site, and the margin between the discounted tenant price and what residents would otherwise pay a standard utility.
Voluntary tenant participation remains the central economic risk. A project modelled on 70% uptake that achieves only 40% can quickly become unviable. Metering complexity compounds this: without a working aggregate-meter setup or equivalent, billing cannot be carried out on a legally sound basis.
What Is GGV and How Does It Differ from Mieterstrom?
Gemeinschaftliche Gebäudeversorgung (GGV), under Section 42b EnWG, allows shared use of solar electricity within a building or across buildings in immediate spatial proximity, without requiring the owner to act as an electricity supplier. Each tenant keeps their own grid contract for residual demand. In exchange for this lighter regulatory burden, GGV projects do not qualify for the Mieterstrom bonus, which makes them simpler to run but typically less profitable.
GGV suits owners who want to pass on the benefit of on-site solar without taking on the full supply and billing obligations of Mieterstrom. It also tends to be the more workable option for mixed-use commercial buildings with varied tenant types.
The metering challenge is identical to Mieterstrom: every consumption point needs a smart meter capable of distinguishing self-generated from grid-supplied electricity. In existing buildings this infrastructure is often missing, and for smaller systems, retrofitting it can quickly exceed the threshold of what the project can economically justify.
What Does the New Section 42c EnWG Regulate for Energy Sharing?
Section 42c EnWG obligates distribution network operators to technically enable the joint use of renewable electricity over the public grid. Eligible participants include private end consumers, smaller businesses, municipal entities, and qualifying associations. At least two separate contracts are required: a standard supply contract for grid electricity, and a distinct sharing agreement that sets out clear rules for allocating the generated electricity among participants.
Unlike Mieterstrom, Energy Sharing under Section 42c currently carries no comparable financial incentive. Shared electricity is charged the same full network fees, levies, and taxes as standard grid consumption, which significantly weakens the economics compared with Mieterstrom or GGV.
The provision also requires a smart meter gateway capable of transmitting generation and consumption data in 15-minute intervals. Older Ferraris-type meters do not meet this requirement. This single infrastructure gap is the most significant practical bottleneck facing the new model.
Why Isn't Energy Sharing Economically Attractive Yet in 2026?
The decisive bottleneck for Energy Sharing in Germany is smart meter coverage: at the end of 2025, Germany's smart meter penetration stood at just 5.5%, compared with 95% in Austria, which has permitted energy sharing since 2021. Compounding this, Germany currently offers no dedicated financial incentive for shared electricity, unlike several other EU countries that reduce network fees or pay a sharing premium for it.
These two factors explain why organisations like Bündnis Bürgerenergie, while broadly welcoming the new framework, are realistic about its near-term limits. Without adjustments to network fees or a dedicated incentive structure, Energy Sharing in 2026 will likely remain most attractive to non-commercial, mission-driven projects: neighbourhood initiatives, citizen energy cooperatives, and municipal pilots.
For most owners of multi-family residential buildings, Mieterstrom and GGV remain the economically superior choice in 2026. Energy Sharing over the public grid is unlikely to become broadly relevant until the smart meter rollout accelerates meaningfully and the federal government adjusts the underlying economics, realistically not before 2027 at the earliest.
What Role Do Energy Communities and Citizen Energy Companies Play?
Energiegenossenschaften (energy cooperatives) are Germany's established legal structure for collectively organised generation projects. The EEG 2023 supports them through the Bürgerenergiegesellschaft designation, offering simplified access to tender processes and slightly higher market premiums, subject to ownership and membership thresholds. Most commercial property operators cannot apply this model directly, but it forms the regulatory foundation that Mieterstrom, GGV, and Energy Sharing all build on.
EU electricity market directives require member states to establish a legal framework for renewable and citizen energy communities. Germany meets this requirement through several parallel instruments rather than a single unified definition.
For asset managers, the practical takeaway is that cooperative models and the new Energy Sharing framework are converging on the same underlying infrastructure. Operators who invest in metering and billing systems now are positioned for either path.
Is Peer-to-Peer Energy Trading Currently Available in Germany?
Peer-to-peer (P2P) energy trading, where prosumers with surplus generation sell directly to nearby consumers via a digital platform, remains largely in the pilot stage in Germany. Research from RWTH Aachen indicates the economic case is positive under current tariff conditions, but the regulatory and metering barriers that prevent commercial deployment at scale are still in place.
Research by Karami and Madlener (Applied Energy, 2021) modelled optimal business cases for P2P platforms in the German context and found that falling feed-in tariffs combined with rising retail prices make local sharing economically attractive. The barriers, the researchers concluded, are regulatory rather than technical.
Section 42c EnWG creates, for the first time, a legal infrastructure that genuine P2P platforms could eventually build on. In the near term, it's more likely that platform providers will operate within the Energy Sharing or GGV framework, handling allocation and settlement, rather than enabling true bilateral trading between individual prosumers and consumers.
Mieterstrom vs GGV vs Energy Sharing: Key Differences
| Mieterstrom (§42a EnWG) | GGV (§42b EnWG) | Energy Sharing (§42c EnWG) | |
|---|---|---|---|
| Geographic scope | One building / cluster | Buildings in immediate spatial proximity | DSO balancing area, expanding in 2028 |
| Uses the public grid | No | No | Yes |
| Supplier obligation | Owner/provider supplies fully | No supplier obligation for owner | No supplier obligation for generator |
| Financial incentive | Mieterstrom bonus (1.5–2.67 ct/kWh) | None | None (as of 2026) |
| Network fees on shared power | Waived | Waived | Full fees, levies, and taxes apply |
| Legally available since | 2017 | 2023 (Solarpaket I) | 1 June 2026 |
| Best economic fit today | Single multi-family buildings | Mixed-tenant portfolios | Mission-driven / cooperative projects |
What Does This Mean for Your Real Estate Portfolio?
For German property owners and administrators, the updated legal landscape means three models now operate in parallel, at very different stages of maturity. Mieterstrom and GGV remain the economically viable choices for individual buildings and portfolios in 2026. Energy Sharing over the public grid establishes the legal foundation for the future, but with no financial incentive and a smart meter penetration rate of just 5.5%, it isn't yet workable at scale.
What unites all three models is dependence on reliable consumption and generation data. Without real-time visibility at the building and meter level, none of the three can be executed properly: Mieterstrom billing can't be legally sound, GGV allocation can't be calculated correctly, and future Energy Sharing projects can't be assessed for viability.
Portfolios that invest in metering infrastructure and digital management systems now will be better positioned once the economics of Energy Sharing improve in the coming years. Waiting for the incentive landscape to clarify means losing time that could be spent building the data infrastructure all three models ultimately require.
Sources
- FfE: Energy Sharing under § 42c EnWG: A legislative milestone, framework conditions and next steps, 2026
- GÖRG: An outlook on Energy Sharing under § 42c EnWG, effective 1 June 2026, 2026
- Baker Tilly: Energy Sharing — EnWG amendment creates new legal framework, 2026
- Deutsche Gesellschaft für Sonnenenergie (DGS): Energy Sharing Germany — sharing solar power from June 2026, 2026
- Bündnis Bürgerenergie: Energy Sharing market analysis, November 2025
- Bundesnetzagentur: EEG funding rates and Mieterstrom bonus, 2026
- German Economic Institute (IW Köln): Tenant Electricity Report, 2024
- Karami, N. & Madlener, R.: Business models for peer-to-peer energy trading in Germany, Applied Energy, 2021