What this changes for your decision
At the end of 2024, Switzerland had 8,17 GW of installed photovoltaics and around 10,4% of annual demand covered by solar. This guide shows the elements to check in the quote and contract.
For your project, the item “forgotten surfaces” 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: Also assess suitable carports, outbuildings, parking areas and walls. Check structure, access, cables, permits and generation use for each surface.
Three checks before signing
1. Feasibility
Check structure, roof condition, fire, access, connection and authorizations before ordering.
2. Perimeter
Distinguish between house, facade, large installation and special surface, because the procedures differ.
3. Decision date
Have rules, aids and technical proofs confirmed just before signing.
References for “Surfaces” for your project
- Swissolar, Marche Solaire 2024: At the end of 2024, Switzerland had 8,17 GW of installed photovoltaics and around 10,4% of annual demand covered by solar.
- OFEN, promotion of photovoltaic installations: The OFEN describes the single remuneration, the calls for tenders, the 30% or 60% support and the floating market bonus.
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 “forgotten surfaces”, 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.