Smart Meter Mandate in 2026: What You Need to Know Now as a Solar Panel Owner
The 2026 smart meter mandate makes the smart metering system a key economic issue for operators of photovoltaic systems with a capacity of 7 kW or more: Anyone feeding power into the grid without a smart metering system will be permanently limited to feeding only 60% of their output into the grid—and will lose up to 40% of their potential feed-in. At the same time, the mandate paves the way for energy sharing starting in June 2026 and for dynamic rates.
The short answer
The 2026 smart meter requirement applies to new PV systems with a capacity of 7 kW or more, effective as of the Solar Peak Act’s entry into force on February 25, 2025. Without a smart metering system, feed-in is limited to 60% of the rated capacity (Section 9(2) of the EEG 2023).
Installation is free; the only costs are capped operating expenses of approximately 100 to 190 € per year. Only the smart metering system will provide access to energy sharing starting June 1, 2026, dynamic rates, and optimized direct marketing.
Starting in 2026, the smart meter requirement will become a significant economic issue for operators of photovoltaic systems with a capacity of 7 kW or more. This article is aimed at PV system operators, investors, and companies with their own systems, and explains what the 2026 smart meter requirement specifically entails—from the legal framework to all deadlines and costs, right through to the new revenue models. Since February 25, 2025, the Solar Peak Act has fundamentally changed the rules of the game for all new PV systems with a capacity of 7 kW or more: Anyone who does not have a smart metering system installed will be permanently limited to feeding only 60% of their output into the grid.
1. The Solar Peak Act: The Legal Basis for the Smart Meter Mandate
The law is officially titled “Act Amending Energy Industry Law to Prevent Temporary Surpluses in Electricity Generation.” The Bundestag passed it on January 31, 2025, and the Bundesrat approved it on February 14, 2025. Background: By the end of 2024, approximately 100 GW of PV capacity had been installed in Germany. On sunny afternoons, photovoltaic systems generate more electricity than the grid can absorb—with growing consequences for grid stability and feed-in tariff costs.
The political response to this: Decentralized generators must be made controllable. Instead of imposing a blanket cap on PV systems, an intelligent metering system with a control box should allow the grid operator to reduce feed-in in a targeted manner and in real time—only when necessary, and only to the extent necessary. Here’s what the law specifically stipulates for households, businesses, and investors:
- New PV systems of 7 kW or more: Requirement for the meter operator to install a smart meter
- New PV systems (2–100 kWp) without a smart metering system: Feed-in limit set at 60% of rated capacity
- New PV systems of 2 kWp or more: No EEG feed-in tariff when the electricity price on the exchange is negative
- Existing facilities in operation before February 25, 2025: full grandfathering, no retroactive changes
2. Who is required to install a smart meter? The 7-kW threshold in detail
Anyone who connects a photovoltaic system to the grid that exceeds this threshold must have a smart meter installed. The requirement under Section 29 of the MsbG applies to three consumer groups:
- Households and businesses with an annual consumption of more than 6,000 kWh (Section 29(1)(1) of the MsbG)—which corresponds roughly to a single-family home with a heat pump
- Operators of solar power systems with an installed capacity of 7 kWp or more (Section 29(1)(2) of the MsbG)
- Operators of controllable consumption devices such as heat pumps, wall boxes, or home storage systems with a capacity of 4.2 kW or more (Section 29(1)(3) of the MsbG in conjunction with Section 14a of the EnWG)
The requirement applies if even one of these criteria is met. This is particularly relevant for households: Anyone operating a heat pump and a PV system with a capacity of less than 7 kW is already subject to the requirement based on the heat pump alone. The old analog Ferraris meter or a simple digital electricity meter must then be replaced with a smart metering system.
| System size | Obligation? | Grid Connection Without iMSys | Annual Operating Costs (Capped) |
|---|---|---|---|
| ≤ 2 kWp (balcony power plant) | No – except | unlimited | – |
| > 2 to ≤ 7 kWp | Not mandatory, but a 60% limit | max. 60% | Approx. 30 €/year (optional) |
| > 7 to ≤ 15 kWp | Tax + Tax Box | max. 60% | about 100 €/year |
| > 15 to ≤ 25 kWp | Tax + Tax Box | max. 60% | approx. 160 €/year |
| > 25 to ≤ 100 kWp | Tax + Tax Box | max. 60% | approx. 190 €/year |
| > 100 kWp | Mandatory (rollout starting in 2028) | individual | Control Box + RLM Meter |
| Operating costs are capped by law under Section 30 of the MsbG (including the tax box). Source: Metering Point Operation Act (MsbG), as of August 2026. | |||
Important for landlords and property owners: Anyone who operates a building with a PV system exceeding 7 kW is directly affected. The cost of any necessary meter cabinet upgrades is borne by the property owner—not the tenant. The sooner the meter cabinet is checked for retrofit compatibility, the less it will cost.
Voluntary Installation: Even if you are not part of the mandatory group, you can still have a smart meter installed. Starting in January 2025, the meter operator must complete the installation within four months upon request. The incentive: access to dynamic electricity rates and Energy Sharing starting in June 2026.
3. What happens without a smart meter? An explanation of the 60% power reduction
Specific calculation example: A new 12-kWp system without a gateway may feed a maximum of 7.2 kW into the grid. On a summer day with 11 kW of production, 3.8 kW goes unused. With 1,000 full-load hours and a feed-in tariff of 7.70 ct/kWh, this results in a loss of revenue of about €293 per year—every year, as long as the smart metering system has not yet been installed.
The limit also applies to PV systems between 2 and 7 kWp, for which the previous 70% rule has been eliminated. Even without a legal requirement to install the system, you stand to lose up to 40% of potential feed-in revenue without the new metering system. The limit is automatically lifted as soon as the smart meter is installed and the grid operator has successfully completed an end-to-end test of remote controllability.
4. When do the rules take effect? Deadlines and the status of the smart meter rollout as of 2026
The rollout is underway, but many households are still waiting for installation—not so much because of legal loopholes as because of capacity constraints among metering point operators and a lack of compatible hardware. Anyone connecting a new system to the grid today must expect to start out with the 60% limit and switch to full feed-in only after installation is complete.
| Date | What Applies |
|---|---|
| February 25, 2025 | Solar Peak Act Takes Effect; All New Systems 7 kW and Above Are Affected |
| December 31, 2025 | Statutory 20% quota for mandatory monitoring stations (achieved: 23.3%) |
| February 2027 | End of the 24-month transition period for new systems with a capacity of 7 kW or more |
| January 1, 2029 | Mandatory retrofitting for existing systems over 7 kW; ensure controllability |
| End of 2030 | 95% of all mandatory metering points equipped with a smart meter gateway |
| 2032 | 100% rollout target for all households and solar power systems |
| Rollout rates pursuant to Section 45 of the MsbG. Deployment status: Federal Network Agency, Quarterly Report as of December 31, 2025 (pv magazine, December 29, 2025). | |
For operators of existing systems over 7 kW: no action is required—the metering point operator will contact you on its own initiative. It is legally required to provide written notice at least three months before the planned installation (Section 37 of the Metering Point Operators Act). Within this period, owners may choose a different metering point operator to compare costs.
5. Smart metering system, smart meter gateway, and control box: What’s behind them?
A smart metering system is more than just a digital electricity meter: it is the communication infrastructure that connects the PV system, the grid operator, the direct marketer, and the supplier in real time. Here are the three components in detail:
- Modern Metering System (mME) – the digital electricity meter. It replaces the analog Ferraris meter, records electricity generation and consumption every 15 minutes, and automatically transmits the data. When you view your consumption in 15-minute intervals, it’s much easier to identify energy-hungry appliances—such as washing machines, heat pumps, and wall boxes.
- Smart Meter Gateway (SMGW) – the BSI-certified communication unit. It connects to the meter using encrypted communication via three interfaces: LMN (meter connection), WAN (communication with the metering point operator, grid operator, and direct supplier), and HAN (local control, dynamic rates).
- Control box (control device) – enables the grid operator to remotely control power feed-in in real time. Only when the control box is activated is full power enabled and the 60% limit lifted.
For large-scale PV systems exceeding 100 kW, data loggers are also required for continuous monitoring. For systems exceeding 500 kW, certified EZA controllers in accordance with VDE-AR-N 4110 are also required. Solar Package I (May 2024) raised the previous EZA controller requirement from 135 kW to over 500 kW—PV systems below this threshold fall under the simplified VDE-AR-N 4105 standard. The key advantage: Intelligent metering systems (iMSys) form the basis for dynamic rates, direct marketing, and energy sharing—revenue streams that are not accessible without iMSys.
6. Negative electricity prices, declining feed-in tariffs, and the impact of smart meters
Current Feed-in Tariff (effective August 1, 2026)
As of August 1, 2026, the feed-in tariff rates have decreased by approximately 1% due to the semi-annual phase-out. According to the Federal Network Agency, the following feed-in tariff rates apply to systems commissioned between August 1, 2026, and January 31, 2027:
- up to 10 kWp, partial feed-in: 7.70 ct/kWh
- Up to 10 kWp, full feed-in: 12.22 ct/kWh
- 10–40 kWp, partial feed-in: 6.66 ct/kWh
- 40–100 kWp, partial feed-in: 5.44 ct/kWh
The next reduction is scheduled for February 1, 2027. The declining feed-in rates are shifting the focus: Self-consumption—especially for households with a heat pump or wallbox that consume more than 6,000 kWh annually—is becoming increasingly attractive compared to simply feeding electricity into the grid. Our article on the 2026 EEG feed-in tariff and the CfD reform analyzes what this means in the long term.
Negative electricity prices: A growing phenomenon in the electricity market
- 2023: 301 hours with a negative electricity price on the exchange
- 2024: 457 hours (+52% compared to 2023)
- 2025: 573 hours – a new record (+25% compared to 2024)
The more photovoltaic systems, heat pumps, and storage units are connected to the grid, the more frequently solar midday peaks occur, during which the price drops below zero. For new systems commissioned on or after February 25, 2025, the following applies during these hours: no EEG feed-in tariff. To compensate, these hours will be added to the end of the 20-year subsidy period. Our article on negative electricity prices and PV investors explains why this isn’t a problem for well-prepared investors.
Important limitation: This rule takes effect only after the PV system has been equipped with a smart meter and a new calendar year has begun. In the year the system is commissioned, the full feed-in tariff is still paid out. Those who operate a battery storage system can stop feeding electricity into the grid during hours with negative prices and charge the battery instead—more on this in the article on PV systems with battery storage and co-location.
7. Energy Sharing Starting in June 2026: The New Revenue Model for PV Operators
The law (Bundestag: November 13, 2025; effective: December 22, 2025) requires all distribution system operators to enable energy sharing within their balancing zones starting June 1, 2026. Starting June 1, 2028, this will be extended to directly adjacent balancing zones. Here’s what that means for operators, households, and investors:
- Instead of a feed-in tariff of 7–8 ct/kWh: Sell electricity directly to neighbors—typically 15–25 ct/kWh, freely negotiable
- Households without their own power generation benefit as consumers: it's cheaper than regular grid electricity
- Grid fees will continue to apply; the German model does not provide for separate subsidies
- All participants must have a smart meter installed—a simple digital meter without a gateway is not sufficient
Eligible participants include private individuals and households, SMEs (up to 250 employees / €50 million in revenue), municipalities, and legal entities governed by public law. Large energy companies are excluded. The administration of the program may be delegated to service providers such as municipal utilities or energy-sharing platforms—the costs of which should be factored into the profitability analysis.
8. Smart Meter Installation: Costs, Providers, and What Landlords Need to Know
| Performance | Metering System | Control Box | Total per year |
|---|---|---|---|
| > 7 to ≤ 15 kW | about 50 € | about 50 € | about 100 € |
| > 15 to ≤ 25 kW | approx. 110 € | about 50 € | approx. 160 € |
| > 25 to ≤ 100 kW | approx. 140 € | about 50 € | approx. 190 € |
| Price caps pursuant to Section 30 of the MsbG. Over 20 years: approximately €2,000 to €3,800. Source: Metering Point Operations Act (MsbG), as of August 2026. | |||
Over 20 years, these costs total between €2,000 and €3,800—a manageable expense compared to the loss of revenue resulting from the 60% reduction without a smart meter. There is no cap on the costs of modernizing a meter cabinet if it does not comply with current standards: typically €500 to €2,000, and in some cases up to €5,000. These costs are borne by the owner, not the tenant.
Changing Meter Service Providers: After receiving the installation notice, households and businesses have three months to switch to another provider. After that, switching becomes significantly more complicated. Landlords with PV systems exceeding 7 kW should have their meter cabinets inspected in a timely manner to ensure they can be retrofitted; they cannot prevent the installation of smart meters (Section 36 of the Meter Service Act (MsbG)).
Financial Benefit Under Section 14a of the Energy Industry Act (EnWG): Anyone who operates controllable consumption devices, such as heat pumps or wall boxes, receives a reduction in grid fees of €120 to €200 per year as compensation for allowing the grid operator to temporarily reduce the power output of these devices in the event of grid overload. In many cases, this fully offsets the annual operating costs of the smart meter.
Planning for Smart Meter Readiness—Right from the Start
Logic Energy designs, builds, and operates turnkey PV systems in which iMSys, the control box, and the meter cabinet are included in the planning from the very beginning—not as retrofits, but as standard features. The contractual partner for direct investments is mediplan Helm e.K., a partnership with personal liability of the owners.
9. What the smart meter mandate means in practice for PV investors
Those who fail to incorporate smart metering systems will permanently exclude themselves from a growing portion of their revenue potential. Three specific consequences:
- Ensure full power feed-in right from the start. A PV system with a smart meter feeds in 100% of its power, while one without feeds in only 60%. For a 750-kW system, this means that instead of 750 kW, only 450 kW is fed in continuously—a loss of up to 30% of the calculated annual yield, every year until the smart meter is installed.
- Plan for infrastructure from the very beginning. A compatible meter cabinet should be included in every project plan; operating costs of €100 to €190 per year should be factored into every cost-benefit analysis. A reputable project planner includes the metering system, control box, and meter cabinet in the plan as standard.
- Energy sharing and direct marketing as a source of additional revenue. Instead of a feed-in tariff of 7–8 ct/kWh, energy sharing can generate 15–25 ct/kWh—yet households, as customers, still pay less than they would on the regular electricity market.
Outlook: 2027 EEG Reform
The government draft of the EEG 2027, approved by the Federal Cabinet on July 29, 2026, calls for the elimination of the fixed feed-in tariff for new installations and a transition to two-sided differential contracts. The law has not yet entered into force. Anyone who wants to secure the proven subsidy system for 20 years has good reason to consider commissioning a plant in 2026—read more about this in our article on the 2026 feed-in tariff and the EEG 2027.
Frequently Asked Questions About the 2026 Smart Meter Mandate
As a solar panel owner, do I have to have the smart meter installed myself?
No. The installation is carried out by the responsible metering point operator, not the facility operator. The operator will contact you on its own initiative and notify you of the appointment in writing at least three months in advance (Section 37 of the Metering Point Operators Act [MsbG]). Use this notice to compare providers within the three-month period.
Does the 60% reduction also apply to my existing system?
No. Systems that went into operation before February 25, 2025, are fully protected under grandfathering provisions. The 60% feed-in limit under Section 9(2) of the EEG 2023 applies only to new installations between 2 and 100 kWp without a smart metering system. For existing installations over 7 kW, a retrofitting requirement will not take effect until January 1, 2029.
As a solar panel owner, how much does a smart meter cost me per year?
Installation is free; the only costs incurred are capped operating costs in accordance with Section 30 of the MsbG: approximately €100 per year for 7–15 kW, approximately €160 per year for 15–25 kW, and approximately €190 per year for 25–100 kW (each including the control box). Any meter cabinet modernization is not subject to the cap (typically €500 to €2,000).
What is the difference between a smart meter, a smart metering system, and a control box?
The modern metering system (mME) is a purely digital meter. When combined with a BSI-certified smart meter gateway, it forms an intelligent metering system (iMSys)—commonly referred to as a smart meter. The control box is an additional component that allows the grid operator to remotely control power feed-in; only with this component is the 60% limit eliminated.
When does an existing system over 7 kW need to be retrofitted?
For existing systems with a capacity of more than 7 kW, a retrofitting requirement will take effect on January 1, 2029: By that date, the system must be capable of being controlled via a smart metering system. You do not need to take any action yourself—the metering point operator will schedule the installation and give you three months’ notice.
Can I participate in Energy Sharing without a smart meter?
No. Energy Sharing under Section 42c of the Energy Act (EnWG) (effective June 1, 2026) requires a smart metering system, because all generation and consumption data must be measured to the nearest quarter-hour. A simple digital electricity meter without a smart meter gateway is not sufficient.
Does the smart meter requirement also apply to a 9-kWp system with a full-capacity storage unit?
Yes. The requirement is based on the installed rated capacity, not on the amount of electricity fed into the grid. A 9-kWp system exceeds the 7-kW threshold and is therefore subject to the smart meter requirement—regardless of whether it has an electricity storage system or how much electricity is fed into the grid.
Can I have a smart meter installed voluntarily, even if I’m not part of the group required to do so?
Yes. Starting in January 2025, the meter operator must install a meter requested on a voluntary basis within four months. The benefit: access to dynamic electricity rates and energy sharing starting in June 2026—sources of revenue that are not available without a smart metering system.
Conclusion
The 2026 smart meter mandate may sound like red tape—but in reality, it’s the technical key to the next generation of PV yields. Anyone planning a system that will use Energy Sharing starting in June 2026, respond flexibly to negative electricity prices, and remain competitive in the direct sales market needs a smart metering system—not in spite of the mandate, but precisely because of the opportunities it unlocks. Our guide to EEG feed-in tariffs for 2026 and the overview of photovoltaic investments for 2026 show how this fits into the current subsidy landscape.
Sources and Legal Basis
- Federal Network Agency – EEG Subsidies and Subsidy Rates (Feed-in Tariff, Period: August 1, 2026–January 31, 2027), accessed August 4, 2026
- Metering Point Operations Act (MsbG) – Sections 29, 30, 36, 37, 45 (Installation Requirement, Price Caps, Notice Period, Rollout Quotas)
- Section 42c of the Energy Industry Act (EnWG) – Shared Building Energy Supply / Energy Sharing
- Section 14a of the Energy Industry Act (EnWG) – Controllable Consumption Devices (Grid Fee Reduction)
- Section 9 of the EEG 2023 – Technical Specifications / 60% Feed-in Limit
- pv magazine Germany – “Solar Peak Act Published in the Federal Law Gazette,” February 24, 2025
- pv magazine Germany – “Smart Meter Rollout Reaches 20 Percent Mark for Mandatory Installations” (23.3% as of December 31, 2025), December 29, 2025
- Finanztip – Feed-in Tariff 2026: Amount, Trends, and Planned Reforms, as of August 2026
Edited by Logic Energy. Last updated: August 2026.
