Solar calculator · free
Solar calculator Stäfa: What can your roof do?
Enter your address in Stäfa, check the roof faces, answer a few short questions. The calculator uses the electricity price of Energie und Wasser, Gemeindewerke Stäfa and shows size, yield, cost, subsidies and payback for your building.
- Federal roof dataArea, pitch and solar irradiation of every roof face (sonnendach.ch).
- Electricity price of your municipalityElCom tariff 2026 instead of the Swiss average.
- Checked by a project managerOn request a free site visit and a binding quote within 72 hours.
Prefer to call? 044 980 08 80
718 kWp built. From single-family homes to a 150 kWp commercial roof.
- Member of
smart-me Partner 2025
Next step
Have the figures checked on site, free of charge.
Zarko Mitrovic will call you within one working day. During the visit we check the roof, electrical system and consumption. Afterwards you receive a binding quote within 72 hours.
Zarko MitrovicSolar project manager
Prefer to talk straight away?
044 980 08 80
Solar calculator Stäfa
What a solar system brings in Stäfa
Worked out with the 2026 household tariff of Energie und Wasser, Gemeindewerke Stäfa: 29.6 ct./kWh incl. VAT, 3.5 ct. above the median in the Canton of Zurich.
| Household | Consumption per year | System | Price after subsidy and tax deduction | Saving in year 1 | Payback |
|---|---|---|---|---|---|
| 4 persons | 4,500 kWh | 6.8 kWp | CHF 11,400–15,500 | CHF 750–780 | 15–22 years |
| 4 persons with heat pump | 9,500 kWh | 14.3 kWp | CHF 19,900–26,300 | CHF 1,730–1,770 | 12–16 years |
| 4 persons with heat pump and electric car | 12,000 kWh | 15.8 kWp | CHF 21,400–28,500 | CHF 2,160–2,210 | 10–14 years |
Assumptions: roof with room for about 16 kWp, 1,000 kWh per kWp and year, feed-in at 8 ct./kWh, one-off payment from Pronovo (CHF 360/kWp), tax deduction at a marginal rate of 25 %. Prices including installation and VAT. Heat pump +5,000 kWh, electric car +2,500 kWh a year.
Solar power in Stäfa in figures
- Electricity price 202629.6 ct./kWhHousehold (H4) incl. VAT, Energie und Wasser, Gemeindewerke Stäfa
- Median in the Canton of Zurich26.1 ct./kWhHousehold (H4) incl. VAT, 159 municipalities
- Solar potential of the roofs64.7 GWha year on the suitable roofs (SFOE)
- Used today11.9 %8.6 MWp of solar installed
Sources: ElCom, tariffs 2026; Swiss Federal Office of Energy SFOE, solar potential of Swiss municipalities; Energie Reporter (SwissEnergy, CC BY 4.0).
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Frequently asked questions
Questions about the solar calculator
Is the site visit really free?
Yes. The visit and the quote cost you nothing and commit you to nothing. You only decide once you hold the binding quote in your hands.
What does a solar system cost in Stäfa?
For a single-family house of 4 persons the calculator proposes about 6.8 kWp. That costs CHF 17,700–23,200 including installation and VAT. After the one-off payment and the tax deduction, CHF 11,400–15,500 remain. For your roof, the solar calculator above works it out with your address.
Is a solar system worth it in Stäfa?
With the electricity price of Energie und Wasser, Gemeindewerke Stäfa (29.6 ct./kWh incl. VAT) this system saves CHF 750–780 in the first year and has paid for itself after 15–22 years. With a heat pump and an electric car it is CHF 2,160–2,210 and 10–14 years, because you use more of the solar power yourself.
Is there a cantonal subsidy for photovoltaics in the Canton of Zurich?
The Canton of Zurich does not directly subsidise photovoltaic systems. You receive the federal one-off payment, and some communes and cities have their own programmes. We apply for all contributions that apply to your system.
Can I deduct a solar system from my taxes in the Canton of Zurich?
For existing buildings, the system is deductible as an investment in renewable energy. The condition is that it is installed at least one year after the new build. How much that amounts to in your tax return is something the tax office or your tax adviser can tell you.
How accurate is the solar calculator?
It gives guide values, not a quote. It uses the federal roof data (sonnendach.ch), the electricity price of your municipality (ElCom 2026) and the one-off payment from Pronovo. What it cannot see: roof condition, shade from trees, electrical system, access. That is why we check these during a free site visit and send you a binding quote within 72 hours.
Where does the roof data come from?
From the Swiss Federal Office of Energy (sonnendach.ch). It records area, pitch, orientation and solar irradiation of every roof face of every building in Switzerland. The aerial image is from swisstopo. We count about 70 % of the area as panel area; the rest is needed for edges, gaps and roof windows.
Which subsidies are included?
The federal one-off payment (Pronovo): CHF 360 per kWp for systems below 30 kWp, proportionally less above. Plus the tax deduction for existing private buildings, calculated with a marginal tax rate of 25 %. Cantonal and municipal grants are not included; we check them during the site visit.
Is a battery worth it?
A battery raises self-consumption but costs more. Whether it pays depends on the feed-in tariff and your consumption. That is why the calculator shows both options side by side.
Why do you need my contact details?
We send you the results by e-mail, and a project manager looks at the figures. We do not pass on your details. We are not a referral portal; we plan and build the systems ourselves.
Which regions do you cover?
All of German-speaking Switzerland. We build most often in the cantons of Zurich, St. Gallen, Schwyz and Aargau. Our locations are in Zumikon ZH and Lachen SZ.