In town, the roof potential must be verified before any promise of production. Check the site data and official sources before signing.
Decision to make
In town, the roof potential must be verified before any promise of production. Adapt this decision to the building, your actual consumption and the project schedule.
For this project, start by identifying the grid operator, applicable tariff and site constraints. The quotation must specify the conditions affecting connection, metering or the value of surplus electricity.
Practical effects of the project
- In Geneva, the local calculation must cite SIG: feed-in tariff, meter, connection and possible aid change the net price.
- SIG publishes for 2026 a solar injection remuneration of 10.96 ct/kWh for installations up to 100 kWp.
- SIG also announces a 2026 solar premium equivalent to 25% of the federal PRU for certain new self-consumption installations up to 30 kWp.
- In the city, PPE, access to the roof, technical equipment and urban shading must be treated before performance.
- The quote must indicate whether a battery or terminal modifies self-consumption and therefore the value of the kWh produced.
These points help assess the topic ‘ Solar in Geneva City: SIG, roof and feed-in tariff ’ without turning a national average into a local promise. Every decisive figure needs its source, date and scope.
Specific controls
- Confirm site data with the relevant professionals and connection conditions with the grid operator.
- Show base price, options, connection, aid and exclusions separately.
- Compare a reference hypothesis with a conservative variant before signing.
The answers should appear in the quote or in a dated appendix. A verbal explanation is insufficient if it changes the price, expected output, financial support or a contractual obligation.
Compare quotes
- Tariffs: state the purchase price, surplus remuneration and fixed charges applicable to the site, with their source and date.
- Production: provide a monthly estimate with orientation, shading, losses and weather assumptions.
- Investment: separate material, installation, safety, scaffolding, connection, procedures and options.
- Aids: distinguish confirmed amount, estimate and deposit liability.
- Contract: specify guarantees, calendar, deposit, exclusions, maintenance and after-sales service.
In town, the roof potential must be verified before any promise of production. In the comparison table, keep one column for the stated value, one for the evidence provided, and one for the effect of a less favorable hypothesis.
Cautious scenario
Test the project with slightly lower production, an unconfirmed grant and less favourable surplus remuneration. This scenario shows whether the decision remains sound based on self-consumption, roof quality and a controlled installed cost.
The main references used are ElCom - Slight drop in electricity prices in 2026, Confederation - Sonnendach / solar potential of roofs, Energiefranken - Search for energy aid by municipality, SIG - Financial support and remuneration for solar injection 2026. They frame the method, but the local amounts and contractual conditions must be rechecked at the time the offer is signed.
Risks to be managed
The quote must indicate whether a battery or terminal modifies self-consumption and therefore the value of the kWh produced. Ask who assumes this risk, what proof will be provided and how a change is handled after ordering.
A more expensive solution should meet a specific need in your project. Ask for a documented benefit and a separate price for each option.
Next step
Gather the address, annual consumption, future electricity uses and building documents. Then check the grid operator's conditions, available grants and site constraints; request quotations covering the same scope.
In town, the roof potential must be verified before any promise of production. You can then decide with a documented net price, clear responsibilities and assumptions that each company can explain line by line.
Points to check
- Tariffs: Compare the tariff for your address with the Swiss ElCom median for 2026, keeping local prices separate from the national benchmark.
- Grants: Check the programme, eligibility, documents and deadlines with Pronovo, the canton or municipality. Include only confirmed contributions in your budget.
- Roof potential: Sonnendach is presented as a public pre-diagnosis, to be validated by a technical visit.
- ROI: the method separates self-consumption, injection, installed price, taxation and payment schedule.
- In Geneva, the local calculation must cite SIG: feed-in tariff, meter, connection and possible aid change the net price.
- SIG publishes for 2026 a solar injection remuneration of 10.96 ct/kWh for installations up to 100 kWp.