The canton of Aargau combines dense residential areas, commercial zones and agriculture. For photovoltaics in 2026, the combination of Pronovo, municipal programmes, the cantonal PV bonus for renovations and tax deduction is particularly relevant. This page explains which points in the canton of Aargau should be checked before ordering, starting construction and comparing quotes.
Key points at a glance
For subsidies in the canton of Aargau, these points matter most in 2026:
- Pronovo is the national basis for standard photovoltaic systems.
- The Canton of Aargau sets PV-related accents mainly through advice and bonus contributions for building envelope renovations with PV.
- Municipal programmes are important: Aarau, for example, offers its own PV contributions.
- For tax purposes, energy-related investments in existing buildings and the deduction of subsidies must be examined.
- AEW, IBB, Eniwa and local utilities may have different feed-in tariffs paid by the grid operator, HKN models or self-consumption offers.
The specific subsidy always depends on address, system, building condition, grid operator, and deadlines of the respective program.
- As of 11.07.2026
Federal subsidy 2026 at a glance
For photovoltaic systems, there are one-off payments nationwide via Pronovo. The key instruments are:
- KLEIV - One-off payment for systems with less than 100 kW capacity.
- GREIV - One-off payment for systems of 100 kW or more.
- HEIV - high one-off payment for systems without self-consumption from 2 kW to 149.99 kW.
- Auctions and other instruments - for larger systems without self-consumption, auctions, the sliding market premium or other subsidy instruments may apply depending on the project.
- Additional bonuses - depending on the system, winter electricity, tilt angle, or parking area bonuses may be relevant.
Deadlines are not the same for all instruments. The KLEIV is generally applied for after commissioning. For GREIV, HEIV, auctions as well as cantonal or municipal programmes, other deadlines may apply; they should be checked before ordering or starting construction.
Cantonal subsidies in the canton of Aargau
For standard photovoltaic systems, the national Pronovo subsidy is primarily relevant in the canton of Aargau. In addition, the canton lists PV-related subsidy points: These include consulting services for self-generated electricity and bonus contributions when a roof or facade renovation is combined with photovoltaics.
The distinction is important: This is not a blanket cantonal stand-alone subsidy for every photovoltaic system. Anyone who is already renovating the roof, facade or building envelope should check the PV bonus early on, as technical requirements, scope of renovation and application deadlines are decisive.
Municipal additional contributions may also be relevant. The city of Aarau, for example, lists its own contributions for photovoltaic systems, integrated systems and facade systems. Other municipalities and energy suppliers are to be checked on a location-specific basis via Energiefranken, the municipality and the grid operator.
Municipal and energy supplier subsidies
In Aargau, AEW Energie, IBB, Eniwa and local utilities are relevant, among others. Feed-in tariffs paid by the grid operator, certificates of origin and any solar power models vary by grid area. Therefore, the quote should always be reconciled with the responsible grid operator.
Tax notes in the canton of Aargau
The Aargau tax documents treat energy-saving and environmentally beneficial investments in existing buildings as generally deductible, provided the conditions are met. Subsidies such as Pronovo or municipal grants reduce the deductible costs. For new builds, replacement new builds and value-adding components, the distinction from capital expenditure must be checked separately. There is no uniform Swiss 10 kWp tax exemption threshold; feed-in remuneration and self-consumption must be declared according to cantonal practice or clarified with the tax office.
Important: Feed-in remuneration, self-consumption and subsidies are treated differently depending on cantonal tax practice. Therefore, larger systems, new builds and special cases should be clarified in advance with the tax office or fiduciary.
Feed-in remuneration and feed-in tariffs in the canton of Aargau
Feed-in tariffs paid by the grid operator are not uniform across cantons; the specific grid operator is decisive. From 2026 onwards, if no agreement is reached between the grid operator and the system operator, the quarterly reference market price calculated by the federal government applies. Minimum remuneration rates exist for photovoltaic systems under 150 kW; for systems up to 30 kW, this rate is 6 Rp./kWh. Certificates of origin, local green electricity models and specific grid operator tariffs must be checked separately. Details on the page Feed-in Remuneration Switzerland.
Economically, self-consumption remains central. For apartment buildings, sites, and mixed-use buildings, ZEV, vZEV, and from 2026 local electricity communities (LEG) should be considered. A LEG is not an automatic return guarantee, but a new option that must fit the project technically, legally, and economically.
Permits and insurance in the canton of Aargau
Many well-adapted rooftop systems are subject to notification rather than permit requirements. However, in the canton of Aargau, stricter regulations may apply for protected objects, core zones, facade installations, freestanding systems, or agricultural zones. The AGV should be involved in roof renovations and value-increasing PV installations to ensure that the insurance sum and coverage match the system.
In the canton of Aargau, the Aargauische Gebäudeversicherung AGV is relevant for building insurance. Owners should clarify whether the PV system, a roof renovation, and any battery storage are correctly included in the insured sum and coverage.
Who benefits most from photovoltaics in the canton of Aargau?
Typical situations can be categorised for this canton as follows:
| Situation | Assessment |
|---|---|
| Single-family home with a good roof | Often worth checking, EIV + tax deduction have a strong effect |
| Heat pump present or planned | Self-consumption particularly valuable |
| E-car present or planned | Charging times matter, EMS is worthwhile |
| Apartment building / condominium ownership | Check ZEV, vZEV and LEG from 2026 onwards |
| Commercial / Agriculture | Daily consumption often matches well with solar production |
| Small or shaded roof | Get an exact calculation |
What remains decisive is how well roof area, self-consumption, subsidies, and feed-in tariff paid by the grid operator work together.
Checklist before the quote
Before requesting a quote, this information should be available so that the subsidy and cost-effectiveness can be checked properly:
- Address, municipality and grid area determine
- Check roof area, orientation, pitch and shading
- Calculate system size in kWp and expected annual/winter yield
- Check Pronovo instrument: KLEIV, GREIV, HEIV or for large systems auction/GMP
- Aargau: Check PV bonus during renovation, consulting offers and municipal contributions
- Check subsidy deadlines for each programme: KLEIV usually after commissioning, local programmes often earlier
- Tax deduction: separate existing building, new build/replacement new build and subsidy contributions
- Check the feed-in tariff paid by the grid operator, HKN and any possible green electricity models with the grid operator
- Realistically calculate self-consumption, battery storage, heat pump, electric car, ZEV/vZEV and LEG
- Clarify permit, protected objects, building insurance and any private additional coverage
With this information, the specialist installer can assess subsidy, self-consumption and technical design significantly more robustly.
solar-guide.ch recommends: First check in the canton of Aargau whether the system runs only via Pronovo as standard PV or whether a roof/facade renovation triggers a cantonal PV bonus. Afterwards, the municipality, grid operator and tax deduction should be considered together.
Conclusion
In the canton of Aargau in 2026, the combination is decisive: Pronovo for standard PV, cantonal PV-related contributions during renovation, municipal programmes, feed-in tariff paid by the grid operator and tax deduction. Application deadlines vary depending on the programme.
Via solar-guide.ch, you can have your request forwarded to a maximum of 3 suitable specialist installers. Subsidy, tax, and grid conditions should be checked directly with Pronovo, the canton, the municipality, and the grid operator before placing the final order.
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Frequently asked questions and answers
What subsidies for solar systems are available in the canton of Aargau in 2026?
Nationally, the one-off payment via Pronovo (KLEIV/GREIV/HEIV) and from 2026 the winter electricity bonus for larger systems. Cantonal programmes focus on building renovation, heating replacement and consulting – specific contributions should be checked based on location.
Are there cantonal contributions in addition to the Pronovo subsidy?
This depends on the current programme. The main contribution for standard PV usually comes via the one-off payment; cantonal and municipal additional contributions are possible in specific cases. Overview: Energiefranken.
Is battery storage subsidised in the canton of Aargau?
There is no comprehensive federal or cantonal subsidy for battery storage in 2026. Individual municipalities or energy suppliers may provide contributions – check via Energiefranken.
Are there municipal contributions for photovoltaics?
In some municipalities yes, with very different rates. Amounts and deadlines change; overview on Energiefranken.
Can I deduct a solar system for tax purposes?
For existing buildings, generally yes, as property maintenance. Subsidies received are deducted from the deductible amount. The cantonal tax office provides binding information.
Who helps with the subsidy application?
Your specialist installer usually handles the application to Pronovo on your behalf. Cantonal and municipal applications should be submitted by you or your installer in good time – before construction begins.
