Basel-Stadt pays no contribution of its own per kWp for photovoltaics – the basic incentive is the federal one-off feed-in incentive (around CHF 360.– per kWp for roof-mounted systems). Anyone who renovates the roof or facade at the same time receives, via the «Aktion Solarkraftwerk Basel», an additional Fr. 50.– per m² of roof area plus Fr. 50.– per m² of module area (facade Fr. 70.– each). The planned solar obligation for existing roofs («Solar Offensive») is not yet in force. (As of: November 2026)
Key points in brief
- No cantonal contribution per kWp: for a pure PV system, the federal one-off feed-in incentive and the tax deduction count.
- The cantonal bonus depends on renovation: renovate roof or facade and cover it with PV at the same time, application before construction starts.
- Conditions: building built before 2000, contribution at most 40 percent of the investment, from Fr. 10’000.– incentive contribution a GEAK Plus or a building analysis is required.
- New buildings in Basel-Stadt must already generate part of their electricity themselves (§ 6 Energy Act).
- The Solar Offensive (obligation for existing roofs over 100 m², 15-year transition period) has been with the Grosser Rat since 2025 and is in committee deliberation.
What does the federal government pay in Basel-Stadt?
The basis is the same as in the whole of Switzerland: the one-off incentive (EIV) via Pronovo. For a roof-mounted system up to 30 kWp that is around CHF 360.– per kWp, for a roof-integrated system around CHF 400.– per kWp. For the typical 10 kWp system on a single-family home, that is around CHF 3’600.–. The application is submitted after commissioning; how to do this properly is shown in the Pronovo registration.
The canton's incentive brochure says it in one sentence: the canton supports solar thermal systems, the federal government supports photovoltaics. So anyone who simply wants to put a system on an intact roof should count on the EIV and tax deduction in Basel-Stadt – not on a cantonal contribution.
As of: July 2026 (EIV); the current Pronovo rates are authoritative.
Aktion Solarkraftwerk Basel: the bonus for renovation
It gets interesting as soon as renovation is happening anyway. The «Aktion Solarkraftwerk Basel» rewards the combination of roof or facade renovation with a photovoltaic system – per square metre, in addition to the other incentive contributions for the building envelope:
| Area | Contribution renovated area | Contribution module area |
|---|---|---|
| Roof, renovated and covered with PV | Fr. 50.– per m² | + Fr. 50.– per m² |
| Facade, renovated and covered with PV | Fr. 70.– per m² | + Fr. 70.– per m² |
Source: Förderbeiträge Energie Kanton Basel-Stadt (energy incentive contributions), June 2026 edition, and Aktion Solarkraftwerk Basel (bs.ch, updated 2 October 2026). The current conditions and the commitment in the individual case are authoritative.
The conditions are clear, but strict:
- Application before construction starts via the canton's online application portal, noted in the application for the roof or facade renovation.
- Built before 2000 – newer buildings are excluded.
- Cover the roof as fully as possible: 90 percent of the area with good or very good suitability according to the solar cadastre must be covered with modules. A small system in the middle of the roof is not enough.
- At most 40 percent of the investment costs are subsidised.
- From Fr. 10’000.– incentive contribution, a GEAK Plus or a building analysis is required.
- The programme runs as long as the budget approved by the cantonal government lasts.
A worked example for scale: anyone who renovates 120 m² of pitched roof and covers 90 m² of it with modules gets Fr. 6’000.– for the renovated area and Fr. 4’500.– for the module area – before checking against the 40 percent limit and in addition to the EIV. Why the time of renovation is the best time for a system: Roof renovation with photovoltaics.
What applies today – and what does the Solar Offensive plan?
In force today: New buildings in Basel-Stadt must generate part of their electricity themselves (§ 6 para. 1 Energy Act Basel-Stadt); type and extent are regulated by ordinance, the basis of calculation is the energy reference area. There is no obligation for existing private buildings, not even for a roof renovation – so far that applies only to cantonal buildings. What the obligations look like in other cantons: Solar obligation Switzerland.
Under deliberation: With the revised Solar Offensive, the cantonal government proposed to the Grosser Rat in June 2025 to equip existing buildings with a suitable roof area over 100 m² with photovoltaics within a transition period of 15 years. Facades would be excluded. Those who do not build would pay a replacement levy (10 annual instalments of Fr. 150.– each per missing kilowatt). In addition, the current PV ban in the historic village cores of Basel, Riehen and Bettingen is to be lifted. According to a letter from the cantonal government dated 27 May 2026, the bill is in committee deliberation – nothing has been decided.
For owners, this means: nobody has to retrofit today. But anyone who renovates the roof in the next few years is better off planning the system in now – then the renovation bonus applies, and any later obligation is already met.
Permit: notification or building application?
In the normal building zones and in the preservation zone, notification (Art. 18a Spatial Planning Act) to the Building and Hospitality Inspectorate (BGI) is sufficient for a sufficiently adapted roof system. A building permit is required in the protection zone, in the historic village cores and on cultural monuments; the heritage preservation office is involved there. Facade systems require a permit in zones 2, 2a and 3 and in the preservation zone. What a complete notification dossier looks like: Notification procedure for solar systems.
In the city of Basel in particular, it pays to look at the zoning plan early: large parts of the inner city and many neighbourhood streets lie in protection or preservation zones. We clarify this for your address before the quote.
Taxes and feed-in
For direct federal tax, the investment in a solar system on an existing building counts as property maintenance and is deductible from taxable income, minus incentive contributions received. How Basel-Stadt handles this in detail for cantonal tax is best determined with the tax administration's current guidance; the basics and worked examples are in the guide Deducting a solar system from tax.
The grid operator in Basel-Stadt is IWB. What IWB pays for exported solar power and how this differs from the federal reference market price is explained in the article Feed-in tariffs Basel and Bern. For economic viability, though, what counts most is the electricity you use yourself.
How to clarify your situation in 3 steps
1. Is a renovation planned? If so, plan PV in right away and submit the application for the Aktion Solarkraftwerk before construction starts. 2. Check the zone: normal zone or preservation zone (notification) – or protection zone, village core, monument (building application). 3. Keep to the sequence: cantonal application → notification or building application → registration with IWB → construction → commissioning → Pronovo application → deduction in the tax return.
With every ecoEn quote, clarifying the incentive situation at your location is part of it – including the applications.
For enquiries from the Basel region, we first clarify two things: the year of construction and the condition of the roof. If a roof renovation is due in the next few years anyway, the renovation bonus changes the calculation significantly – whereas if the system is put on a roof that has to be renewed in ten years, dismantling and re-mounting come later. The honest answer is therefore often: roof first, then the system – on the same scaffolding.
Frequently asked questions
Does the canton of Basel-Stadt support photovoltaics?
Not with a contribution per kWp – the basic incentive is the federal one-off feed-in incentive. A cantonal contribution is available through the «Aktion Solarkraftwerk Basel» when roof or facade is renovated at the same time: Fr. 50.– per m² of renovated roof area plus Fr. 50.– per m² of module area, and Fr. 70.– each for facades (as of: November 2026).
What conditions apply to the Aktion Solarkraftwerk?
Application before construction starts via the canton's online portal, building built before 2000, covering 90 percent of the well-suited roof area, at most 40 percent of the investment costs, and from Fr. 10’000.– incentive contribution a GEAK Plus or a building analysis. The programme runs as long as the budget lasts.
Is there a solar obligation for existing houses in Basel-Stadt?
No, not today. The cantonal government's Solar Offensive provides for an obligation for existing roofs over 100 m² with a 15-year transition period; the bill is in committee deliberation in the Grosser Rat (as of: May 2026). For new buildings, an obligation to generate their own electricity already applies today.
Do I need a building permit in Basel for a solar system?
In normal building zones and in the preservation zone, notification to the Building and Hospitality Inspectorate (BGI) is sufficient for an adapted roof system. In the protection zone, in historic village cores and on cultural monuments, a building permit is required.
Is battery storage subsidised in Basel-Stadt?
The canton's 2026 incentive brochure lists no contribution for battery storage, and the federal one-off incentive applies only to the PV system. The current incentive programme is authoritative; we check this as part of the quote.
Does ecoEn work in Basel-Stadt?
Yes, we also carry out projects in the Basel region – planning, installation and electrical connection with our own team, registration with IWB and the Pronovo application included. Our head office is in Zurich. Everything about the region: Solar system in the Basel region.
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Solar system in the Basel region: cost, incentives and process →
Sources: Canton of Basel-Stadt, Office for Environment and Energy (AUE) (Förderbeiträge Energie, June 2026 edition; Aktion Solarkraftwerk Basel, as of 2 October 2026); cantonal government of Basel-Stadt (Council proposal «Solaroffensive», June 2025; letter of 27 May 2026); Pronovo AG.
Last updated: 9 July 2026 · Author: ecoEn editorial team
