What this changes for your decision
The solar potential of Swiss roofs is revised from 50 GW to 65 GW thanks to the increased efficiency of the modules. This guide shows the elements to check in the quote and contract.
For your project, the item “roof potential” should be explained in terms of the building, consumption, grid connection and contract. Ask for the source, date and, for calculated values, the method used.
For your project: National theoretical potential does not replace a building assessment. Compare module dimensions and efficiency with usable area, shading and required clearances.
Three checks before signing
1. Exact references
Ask for models, technical data sheets, guarantees and service partner identified in Switzerland.
2. Comparable quotes
Compare identical power, site limits, connection and service level.
3. Supplier risk
Check references, qualifications, available parts and liability after commissioning.
References for “Potential” for your project
- BFH, Photovoltaic Barometer 2025: The solar potential of Swiss roofs is revised from 50 GW to 65 GW thanks to the increased efficiency of the modules.
Note the date of consultation and the scope of each source. National information does not replace or local rate or technical validation of your project.
Compare quotes on a solid basis
Ask for a reference variant and a conservative variant. Each must separate investment, self-consumption, injection, aid, schedule and responsibilities. You will see if the result holds with a less favorable hypothesis.
For the item “roof potential”, the quote should state the data to confirm before work starts, who will check it and how changes will be handled.
Your next step
Prepare utility bill, roof information, existing contracts and comparable quotes. Answer in writing to open questions, then compare net price, annual profit and contractual consequences.