Incentives for solar systems Aargau 2026: what's really available

What does the federal government pay – regardless of canton and municipality?

As everywhere, the base in Aargau is the one-off feed-in incentive (EIV) via Pronovo, currently around CHF 360 per kWp for systems up to 30 kWp. For the typical 10 kWp system on a single-family home, that's around CHF 3,600. The EIV is neither budget-limited nor location-dependent – anyone who meets the requirements and submits the application cleanly receives it.

As of July 2026; Pronovo's current rates apply.

Does the Canton of Aargau subsidise photovoltaics directly?

No. The cantonal incentive programme supports energy consultations, renovation of the building envelope, wood heating, heat pumps, connections to heating networks – and thermal solar collectors for hot water. Photovoltaics does not appear on the list. At first glance this seems contradictory, but it follows the nationwide division of labour: the federal government pays the base PV incentive via the EIV, and cantons deploy their funds where the federal government doesn't subsidise.

There is, however, an important exception – and it's often overlooked: anyone who renovates the roof at the same time does receive money from the canton that's tied to the solar system. More on that in the next section.

A quirk of the Aargau programme worth noting: in areas with heating networks, heat pumps are only subsidised in exceptional cases – relevant if you want to combine a solar system and heating replacement. For the heating part, the application runs via the canton's building programme portal.

As of: July 2026, Canton of Aargau incentive programme; the current cantonal regulations are decisive.

Combining roof renovation and a solar system: here the canton does pay after all

The bonus doesn't sit in the PV chapter but with the building envelope. Anyone who has thermal insulation subsidised and installs a photovoltaic system at the same time receives a surcharge per square metre – and it's substantial:

Canton of Aargau incentive programme, 05/2026 edition (summary and brochure, ag.ch); as of: September 2026. The current incentive conditions and the individual approval are decisive.

The difference between on-roof and in-roof is not a detail here: for the roof-integrated solution, the canton pays more than triple the bonus – because it replaces the roof skin rather than just sitting on it. If the roof needs to come off anyway, this noticeably shifts the calculation between the two construction methods: In-roof or on-roof? · In-roof solar system

The conditions that applications fail on:

• The incentive application must be submitted before construction starts – anyone who builds first loses the contribution entirely.
• Eligible are buildings with a building permit year before 2000, and only components that were already heated in their original state.
• The U-value improvement must be at least 0.07 W/(m²·K).
• From CHF 10,000 of incentive contribution per application, a GEAK Plus is mandatory (the canton pays CHF 1,000 towards it for single- and two-family homes).
• Contributions under CHF 2,000 are not paid out.

Who does this – roof and solar system in one process?

This is exactly where the problem lies in practice: roofers, electricians and solar installers often work one after another instead of together, and the incentive application falls between the cracks. What makes sense is a single planning process in which insulation thickness, substructure, module array and application deadlines are set together – before the first hand touches the roof.

We plan and install the solar part in eastern Aargau from Zurich and coordinate it with your roofer; we submit the incentive application for the system. For the insulation part, the application runs via the canton's building programme portal. What needs to be considered technically when roof and system interact: Roof renovation and photovoltaics.

Which municipalities pay extra?

At the municipal level things look friendlier – but less transparent. A number of Aargau municipalities and regional utilities run their own programmes for photovoltaics, some also for battery storage. We deliberately avoid a table of franc amounts here: programmes get adjusted, paused or exhausted mid-year, and nothing goes out of date faster than such a list.

The reliable route: enter your postcode on energiefranken.ch – the platform shows, up to date, all programmes from municipality, canton and utility for your address. Two quirks of municipal programmes also apply in Aargau: they are budget-limited (an empty annual pot means no contribution, however eligible the application), and they almost always require the application before construction starts.

Taxes in Aargau: the deduction plus the new net principle

For tax purposes, Aargau is a solid location for solar owners – for two reasons.

First, the classic investment deduction: investments in renewable energy on existing buildings can be deducted from taxable income. What this brings depends on your marginal tax rate; for middle and higher incomes, the effect in many cases exceeds any municipal top-up contribution. For new construction, on the other hand, the system counts as construction costs – no deduction. Basics and examples: Tax deduction for solar systems.

Second, the net principle, new since 1 January 2026: income from electricity feed-in is generally taxable income. Until now, gross income was the basis; now, the cost of your own electricity purchases may be deducted from feed-in income. So only what remains net is taxed – for most single-family-home systems this means little to nothing. An unspectacular administrative decision with a noticeable effect.

As of: July 2026; the current guidance and practice of the Cantonal Tax Office Aargau are decisive.

Planning a solar system in Aargau: cost guideline and next steps

Anyone who has clarified the incentive question usually wants to know right away what the system costs and who builds it. As a guideline, a turnkey solar system for a single-family home costs CHF 2,100–2,700 per kWp (as of: July 2026; larger systems are lower per kWp). For feed-in, in AEW's grid you have the choice in 2026 between the fixed price of 8.2 Rp./kWh including the guarantee of origin and the quarterly averaged reference market price – details in the AEW tariff guide. We plan and install in eastern Aargau from Zurich, with short distances for site visits and service; a documented reference is in Schneisingen (36.45 kWp, see projects). Cost table, grid operator tariffs and process for the canton: Solar system Aargau – and for your municipality: Baden, Wettingen, Brugg, Lenzburg.

How to clarify your situation in 3 steps

1. Enter your postcode on energiefranken.ch – shows all active programmes for your address. 2. Check conditions and budget status – in particular: application before construction starts? Pot still funded? 3. Follow the order: municipal application (if any) → registration with the grid operator → construction → commissioning → Pronovo application → deduction in your next tax return.

Or skip the research: with every ecoEn quote, clarifying the complete incentive situation at your location is standard – including taking over the applications.

Sources: Canton of Aargau (Energy Incentive Programme, as of May 2026), energiefranken.ch, Pronovo AG, Cantonal Tax Office Aargau.

Last updated: 9 July 2026 · Author: ecoEn editorial team