Many property owners in French-speaking Switzerland still think solar grants amount to a single cantonal payment. In practice, in 2026, there are three layers: federal, cantonal, and tax. Together these can represent 35 to 45% of the gross installation price — provided you know where to look, and above all that you submit the applications in the right order.
This guide covers each canton in turn, without the usual vagueness. Exact figures evolve every year, sometimes every quarter. We give the 2026 ranges as we see them on our sites, specifying what is stable and what is not.
The federal one-time payment in 2026
This is the base layer, and it is the same throughout Switzerland. Managed by Pronovo, the one-time payment (French: RU — rétribution unique) is a federal grant paid once after commissioning. It consists of a fixed component and a variable component per kWp, which decreases with size to avoid incentivising oversizing.
For 2026, the approximate figures for a small installation (up to 30 kWp) are:
- Fixed component: around CHF 200 to CHF 400, depending on the output range.
- Variable component: around CHF 320 to CHF 380 per kWp.
On 8 kWp, that typically gives CHF 2,800 to CHF 3,400. On 15 kWp, the figure rises to CHF 5,000 to CHF 6,000. Beyond 30 kWp, the variable component decreases; above 100 kWp the scheme shifts to the large one-time payment, which follows its own rules.
The payment timeline in 2026 is around 6 to 12 months after commissioning. This seems long, but the mechanism is reliable: Pronovo very rarely loses an application, provided the file is complete. In 95% of cases the installer submits the application, and we always advise asking this question explicitly when getting a quotation: who submits, within what timeframe, and who receives the payment?
Canton of Vaud: stable programme and municipal stacking
Vaud has been one of the most active cantons on residential solar for several years. The cantonal programme pays in 2026 between CHF 100 and CHF 200 per kWp in practice, depending on the year's conditions.
The element that makes a difference in Vaud is the ability to stack municipal grants on top. Lausanne offers specific grants via its industrial services. Several communes in the Morges district (including Rolle, Nyon in the neighbouring district) have had local programmes. The Riviera and the Lavaux have at different periods added their own incentives.
Concretely, for a 10 kWp installation in the Canton of Vaud in 2026, you can aim for:
- Cantonal: CHF 1,000 to CHF 2,000
- Municipal (depending on location): CHF 0 to CHF 1,500
On some urban Vaud sites, we have seen the cantonal + municipal combined total exceed CHF 3,000. Conversely, some rural communes add nothing. This is why any estimate must be done at the level of the specific commune, not the canton.
Canton of Fribourg: a historic solar player
Fribourg was early to develop solar programmes and remains active in 2026. The Fribourg Energy Service (SdE) administers cantonal grants. Amounts generally fall in the same range as Vaud, sometimes slightly above for small installations.
Fribourg's distinctive features are twofold. First, some projects benefit from enhanced support through direct contact with the SdE, which simplifies the application. Second, several communes (Fribourg city, Bulle, communes in the Broye and Glâne) add local premiums, often for older buildings or in protected zones.
For listed buildings or those in a protected ISOS zone, Fribourg sometimes offers specific grants to offset aesthetic constraints (roof integration required, low-profile panels). This level of detail is rare elsewhere in French-speaking Switzerland.
Canton of Geneva: no stable cantonal grant, but active communes
This is the most difficult canton to summarise. At present, Geneva does not have a stable cantonal subsidy programme for residential PV comparable to Vaud or Fribourg. The federal one-time payment via Pronovo is of course still paid.
Several Geneva communes do, however, offer occasional or permanent grants. Carouge, Meyrin, Versoix, Onex, and Vernier have had programmes at different times. The commune's energy department or the Geneva industrial services (SIG) is the right point of contact.
Our recommendation for Geneva property owners: start with a simulation through SIG, which has historically offered structured support, then cross-reference with the commune. In some communes the combination can be very attractive. In others, you are left with the federal one-time payment alone — which shifts the payback calculation by 12 to 18 months.
Canton of Valais: selective grants with a focus on older buildings
Valais has maintained a cantonal programme in 2026, with a focus on older buildings, global energy renovation, and tourist areas (Verbier, Crans-Montana, Zermatt on the German-speaking side). Figures are in the same range as Vaud, sometimes slightly below for new builds, sometimes above for renovation.
The relevant angle in Valais is combining with the federal Building Programme if the installation is part of a broader renovation (insulation, boiler replacement, windows). A consolidated file is generally submitted that unlocks more than the sum of individual grants.
Canton of Neuchâtel: grants targeted around CECB
Neuchâtel takes a structured approach centred on the CECB. Several cantonal grants are conditional on first producing a CECB+ report and including the PV project in a measures plan. This is not a barrier: it is an opportunity for a genuine global energy assessment, which often surfaces other priorities (frequently loft insulation or replacement of an ageing oil boiler).
Amounts per kWp are in the regional average. The distinctive feature is the "package" effect: a file combining PV + heat pump + insulation can unlock a total of grants significantly higher than the sum of the individual grants.
Canton of Jura: occasional grants, to be checked each year
Jura has had periodic solar grants. In 2026, availability should be checked at the time of submission. When amounts are available, they are in line with the regional average, but the annual budget is limited and can be exhausted by mid-year. Our advice for Jura property owners: submit early, ideally before summer.
Tax deductions: the most profitable grant, and the least visible
All French-speaking cantons allow the energy investment to be deducted from taxable income, up to the net cost after grants. The general rule across Switzerland is that 100% of the unsubsidised net amount is deductible, over one or two tax years depending on the canton.
At a marginal rate of 27%, on an installation costing CHF 18,000 gross minus CHF 4,000 in grants = CHF 14,000 deductible, the tax saving is CHF 3,780. At a marginal rate of 35%, it rises to CHF 4,900. For high-income households, this is often the largest single component of the package — sometimes exceeding the combined cantonal grant and one-time payment.
The classic pitfall: forgetting to deduct in the correct tax year. The deduction is tied to the year of actual payment of invoices, not commissioning. When a project straddles two calendar years, it must be split or planned in advance with your accountant.
The order in which to apply for grants
Procedural errors cause grants to be forfeited more often than one might think. Three rules serve as safeguards:
- Submit the cantonal grant application before signing the contract. Several French-speaking cantons (Vaud, Fribourg, Neuchâtel) require the application to be submitted before making a commitment. Signing a quotation first and then applying for a grant afterwards can simply disqualify the file.
- Notify the grid operator. Before installation, the grid operator (Romande Energie, SIG, Groupe E, Sogis, Lausanne industrial services) must validate the connection.
- Pronovo one-time payment after commissioning. Once the installation is running, the application must be submitted within 12 months.
A good installer handles all three, including follow-up. If a quotation states "administrative procedures at the client's charge", that is rarely a good sign: files submitted by non-specialists are regularly returned for missing documents, sometimes with several months lost as a result.
What you can actually save in 2026 on a 10 kWp installation
A worked example: detached house in the Canton of Vaud, roof-mounted on tiles, 10 kWp, gross price CHF 22,500.
- Pronovo one-time payment: ~CHF 3,700
- Vaud cantonal grant: ~CHF 1,200
- Municipal grant (depending on location): CHF 0 to CHF 1,500
- Net after grants: CHF 16,100 to CHF 17,600
- Tax saving (marginal rate 27%): CHF 4,350 to CHF 4,750
- Effective net cost: CHF 11,350 to CHF 13,250
Compared with the gross price, the total assistance represents between 41% and 50% of the investment for a household in the cantonal average. For high-income households, the cumulative figure can exceed 55%. That is the difference between an investment that pays back in 11 years and one that pays back in 6–7 years.
The calculation to run before signing is this complete package — not just the gross price. A quotation that does not detail the one-time payment + cantonal + municipal + tax deduction is not a serious quotation: it is an order form.