Solar injection limited to 70% in 2026: what this really changes

The short answer for an owner

The sentence “a solar installation will only be able to inject 70%” is too short to make a decision. It mixes three subjects that must remain separate: the maximum power sent to the network, the total energy produced during a year and the electricity that your house consumes directly. If your panels produce 10 kW at midday, a 70% limitation may mean that the power exported to the grid is capped at around 7 kW in the relevant scenario. This does not mean that your home can only use 7 kW, nor does it mean that 30% of annual energy is automatically lost.

For a buyer, the real question is therefore not “does the rule destroy profitability?” ". The useful question is: to what extent does my installation exceed the demand of the building at the time when production is highest, how does the inverter apply the setpoint, and what annual energy actually remains unused? A house that consumes 3 kW in the middle of the day, heats its water with a surplus and recharges a vehicle can lose very little energy. A large south-facing roof on a house that is empty during the week may be more susceptible to capping.

The rule must also be read in its connecting context. The Association of Swiss Electric Companies describes a new national injection limit from 2026, with injected power being able to be limited to 70% of the nominal power in the targeted cases. The concrete implementation depends on the connection, the distribution network operator and the measuring device. Always ask for written confirmation from the DSO before signing a quote.

Why is this topic appearing now

Swiss photovoltaics have grown rapidly. Many small installations produce simultaneously in good weather, while residential demand is often lower at midday than at the end of the day. The network must absorb these peaks, maintain voltage within authorized limits and invest in transformers, lines, measurement systems and automation. The injection limit responds to this physical constraint, not to an installer’s commercial promise.

Two opposing reactions must be avoided. The first is to say that a limit of 70% makes any project useless. This is false as soon as a significant part of production is self-consumed. The second consists of considering that the limit changes nothing because the panels produce less than their nominal power. This may also be wrong for a large installation on a well-oriented roof, especially during the central hours of a clear day.

The correct analysis is done with an hourly curve or, ideally, fifteen minute intervals. A monthly average does not show the peaks. An annual estimate does not show how many kWh are in the two or three hours where the inverter would be limited. The quote should therefore specify the DC power of the modules, the AC power of the inverter, the injection setpoint, the limitation system and the method used to estimate losses.

This development arrives at the same time as other changes: gradual deployment of smart meters, more differentiated network prices in certain cases and new logic of remuneration for electricity injected from 2027. Households should not try to sum everything up to a single purchase price. A solar installation is a system that produces, consumes, measures, possibly stores and exchanges with the network.

What 70% means: three different powers

The nominal power of the panels

The power listed on the modules is peak power measured under laboratory conditions. A 12 kWp roof does not provide 12 kW all day. Temperature, orientation, tilt, shading, snow, dirt and electrical losses reduce actual power. The word kWp describes the installed capacity; it does not describe the production at each moment.

The power of the inverter

The inverter transforms the direct current from the modules into alternating current usable by the house and the network. Its AC power may be lower than the peak power of the panels. This sizing choice may be rational, but it should not be confused with a regulatory limitation. If the inverter is 8 kVA, it will not be able to supply more than its operating limit, although the modules could produce more for a few minutes.

Exported power

The exported power is what remains after the instantaneous consumption of the building and the possible charging of a battery or another controlled device. With 10 kW produced, 2 kW consumed in the house and 1 kW sent to a battery, the theoretical export is 7 kW. A limit on injection applies to this latter value, not to all gross production. This is why self-consumption is the first lever to calculate before buying a battery.

The measuring point must be clear. Some systems limit the export to the main counter; others use measurement at the connection point and inverter control. The quote should specify where the current meter is located, who provides the data, what happens if communication is lost, and how the system is tested during commissioning.

A simple example with a 10 kWp installation

Let's imagine a 10 kWp installation, a 10 kVA inverter and an export setpoint at 70% of the nominal reference power. To simplify, let's take a very high production hour. The panels provide 9 kW, the house consumes 1,5 kW and the hot water is not yet activated. Without limit, around 7,5 kW could go to the network. With an export limit of 7 kW, approximately 0,5 kW of production must be absorbed by another use, reduced by the inverter or not produced.

The next hour, the house starts a 2,5 kW heat pump. The same production of 9 kW leaves only 6,5 kW to export. The limit then does not create any additional losses, because local consumption absorbs part of the peak. If the battery charges at 2 kW, the export drops to 4,5 kW. In this second scenario, a steering system may be worth more than a much larger but poorly synchronized battery.

Over the course of a year, the periods actually affected may be short. A roof with an east or west slope spreads production more widely over the day. Modules on several sections often reduce the midday peak, even if the gross annual production is comparable. A south-facing roof sometimes maximizes annual production but increases peak hours. The orientation is not good or bad in itself: it modifies the shape of the curve and therefore the value of each kWh.

Request a simulation with and without limitation. It must display at least gross production, direct self-consumption, battery charge, exported energy and peaked energy. If the document only provides an annual production figure, you cannot verify the effect of the rule.

Four house profiles, four different results

House occupied during the day

A family that works partially from home, uses an electric water heater, and runs the washing machine or dishwasher during production can consume much of the surplus. Control should not transform the house into a factory: it is enough to move certain flexible consumptions towards solar hours. The benefit is twofold, because the kWh produced avoids a purchase at the local rate and the injection limit becomes less restrictive.

Empty house from Monday to Friday

Midday production is exported more. A battery can shift some of that energy to the evening, but its size should be based on evening consumption and not the desire to absorb every exceptional peak. A ten or fifteen kWh system is not automatically better than a smaller system. The correct sizing compares the kWh actually displaced, the charge and discharge losses, the lifespan and the total cost.

House with electric vehicle

A vehicle can be an excellent consumer of surplus electricity if its schedule and charging capacity match solar hours. However, you should not assume that a car is always available. If it leaves at 7 h and returns at 18 h, it does not absorb the midday peak. A smart charging station that adjusts charging when the car is present may be useful, but the quote must state whether it measures the surplus at the meter or merely follows a fixed schedule.

House with heat pump

A heat pump often consumes more in winter, when photovoltaics produce less. It can still offer flexibility for domestic hot water or light thermal recharging of the building. This strategy must respect comfort needs and the manufacturer's recommendations. Forcing the pump to run at each thinning can increase wear without improving the bill.

Levers to valorize the surplus

Shift consumption

The first lever is almost always the least expensive: setting the water heater, washing machine, dishwasher, ventilation or vehicle charging to operate when the surplus exists. You must ask the supplier if the function is integrated into the inverter, smart meter, terminal or home automation system. A promise of “intelligent management” must be translated into observable behavior: what metric triggers the device, with what delay, and what happens if the Internet goes down?

Store in a battery

The battery shifts part of the solar energy from the middle of the day to the evening or night. It does not eliminate losses and does not guarantee positive profitability in all profiles. It can also provide a backup in the event of an outage if the system is designed to do so, but a grid-connected battery is not automatically a backup power supply. Ask if backup mode exists, what loads are covered, and what additional components are needed.

Prepare the transition to more variable remuneration

Swissolar describes a new remuneration model which must apply from 2027, with a more direct link between solar injection and the hourly market, as well as a minimum remuneration for small installations under certain conditions. The detail applicable to your project will depend on the DSO and the framework in force. This reinforces the interest of being able to consume or store part of the surplus when the injection price is low, but this is not a sufficient reason to buy a battery without simulation.

Share locally

An own consumption group, a virtual group or a local electricity community can modify the value of a kWh by having it consumed by a neighbor instead of exporting it on a large scale. Feasibility depends on the network topology, participants, meter, contracts and the chosen model. For a detached house, this lever is not always immediately available. For a PPE or a neighborhood, it deserves a separate study.

Should an existing installation be modified?

An installation already in service is not automatically obsolete. Start by checking the inverter, the connection power, the presence of a bidirectional meter, the possibility of receiving an export instruction and the commissioning documentation. A software update can sometimes be enough; in other cases, it is necessary to add a current meter, change the inverter or review the electrical panel.

Don't replace an inverter just because an article talks about 70%. The replacement must respond to a verifiable constraint: incompatibility with the limitation device, excessive power compared to the connection, end of warranty, absence of control or need for battery. Request two offers: a minimum compliance offer and a complete modernization offer. Compare the added value, not just the price of the equipment.

The DSO may also have specific requirements for power modification, battery or limited injection. The response from an installer does not replace confirmation from the DSO. Keep the connection request, the single-line diagram, the inverter settings, the test reports and the written exchanges.

How to recalculate profitability

The injection limit makes an annual model too simplistic. Your calculation should distinguish at least five flows: photovoltaic production, direct consumption, energy stored then returned, export actually injected and peaked energy. Add in conversion losses and, if you're comparing a battery, its possible replacement cost or guaranteed capacity.

For direct consumption, use the purchase price that applies to your address and not a national average. ElCom publishes a Swiss median for 2026, but the amounts remain different depending on the supplier and the municipality. For injection, use the DSO price, its formula and its validity period. Do not automatically put the full purchase price in the “value of the kWh injected” column: the export is paid for separately and may change.

A prudent scenario assumes modest self-consumption, active limitation during peaks and conservative injection remuneration. A central scenario uses a documented load curve and realistic control. A favorable scenario may include an electric vehicle present during the day or an attractive local rate, but it must be presented as a hypothesis. If the return on investment is only positive in the favorable scenario, the project deserves a discussion before signing.

The most useful result is not a number of months. It is an annual value range, accompanied by the assumptions that cause it to vary. This approach allows you to decide whether piloting, a different orientation, lower inverter power or a battery really improves the project.

Questions to ask in a quote

A solid quote simply answers these questions. A quote that only promises “zero loss thanks to artificial intelligence” does not provide the information necessary for a secure purchase.

The checklist before signing

Start by asking for your consumption history, ideally by month and, if available, by quarter of an hour. Note which uses can move and which cannot. Gather the connection power, the name of the DSO, the invoices, the heat pump or terminal projects and the roof constraints.

Then compare two simulations with the same roof: one without battery and one with battery; one with unrestricted export and one with the applicable deposit. Check if the difference comes from kWh actually capped or from a price assumption. A battery should not be credited with the value of a kWh that has already been consumed directly.

Finally, include in the contract the guaranteed power, the limitation system, the responsibility for reporting to the DSO, the commissioning schedule, the availability of data and the processing of a regulatory change. The goal is not to predict every future event, but to know who does what and what costs are included.

Decide with a real operating scenario

A useful simulation doesn't stop at the sunniest day. Ask for an example of a clear day, a variable day and a winter day. In each example, look at production, consumption, battery charge, export and capping. This reading reveals whether the limitation affects a few minutes, several hours or only a power that has already been consumed by the house.

Then observe the behavior for the first few weeks. A hot water control may work on paper but be blocked by a temperature setting. A terminal may be available at midday in the simulation while the vehicle is absent. A battery can reserve backup capacity that is not available for shaving. The owner must receive the priority rules and be able to request a correction.

The contract must also process the data. Request proprietary access to production, purchase, export and battery curves, as well as an export that remains available without the installer's account. In the event of a change of software, router or service provider, you must be able to prove the power exported and the setting applied. An invisible limitation is difficult to control.

Don't oversize a battery just to absorb a few spikes. Compare the cost of each kWh actually displaced with the cost of non-injected energy. If an inverter reduction or different orientation avoids shaving with less equipment, this variant deserves a place in the quote. The most expensive solution is not the most compliant by definition.

For a PPE, add a collective decision. Reduced exported power can modify the sharing between housing, common areas and battery. Owners need to know if the limitation is common, who pays the monitoring meter and who responds to the DSO. In a shared model, an assumption taken for an apartment must not be applied to the entire building without a common curve.

Finally, keep a decision sheet with the assumptions made, the tariffs used, the power accepted and the date of confirmation of the DSO. Rules and prices may change. This trace makes it possible to recalculate the project without starting from a sales argument or an approximate memory.

Conclusion: the rule changes the calculation, not the interest of each roof

The 70% injection limitation transforms a solar installation into an energy management project. It rewards offers which measure the real curve, distinguish self-consumption from export and explain losses instead of hiding the rule behind flattering annual production. It can reduce the value of some large, very south-facing roofs, but it does not automatically remove the value of a residential installation.

To decide, first check the GRD, then request a simulation at short intervals, and finally compare the levers in order: direct consumption, control, possible local sharing, battery and injection. The best solution is not necessarily the one that injects the most. It’s one that remains understandable, measurable and profitable with assumptions that you can actually hold.