Sion • Valais

Solar panels: Sion, Valais Plan your project 2026

Your solar project: Sion. Specify access, lifting equipment and protection of the work area. Include maintenance, insurance and foreseeable replacements in lifetime cost. Specify the work assigned to subcontractors and who is responsible for each task. Distinguish avoided purchase costs from the tariff paid for exported surplus.

Verify the grid operatorCompare detailed quotesScenario: 8 kWp

Roof potential

To assess

Purchase — calculation hypothesis

CHF 0.260/kWh

Net cost — model

CHF 16'960

Payback — model

10-13 years

The 8 kWp scenario above uses the cantonal model assumptions: indicative output, 40 % self-consumption, hypothetical purchase and export tariffs, installed costs of CHF 2 200 to 2 800/kWp and assumed Pronovo support of CHF 360 to 400/kWp. It is not a local quote. Recalculate using your roof, hourly demand, contracts and confirmed grants; include fees, losses and replacements.

Your roof: Sion

Adapt the project to the building’s use, whether a house, apartment building or business premises. Include future vehicle charging or heating changes in the consumption scenario.

In all cases, the useful surface area is almost always less than the gross surface area announced. Skylights, chimneys, setbacks, shading and future maintenance needs must be integrated before talking about final power.

Simulate generation and available surplus before choosing a battery. Keep the simulation assumptions so results can be compared after commissioning.

Exposure and access: Sion

Request a survey of nearby shading and the horizon, with monthly generation estimates. Compare options for your building using the same weather data and loss assumptions.

Assess shifting compatible loads to solar hours before adding storage. Record amounts, deadlines and revision terms in the offer.

Full cost and grants: Sion

The displayed scenario uses an indicative installed cost for 8 kWp. A quote must specify equipment, roofing and electrical work, connection, inspections and fees before deducting confirmed grants.

Programmes depend on the municipality and available funds. Obtain written confirmation of amounts, timing, limits and combined support for your address before including them in the budget.

Specify access, lifting equipment and protection of the work area. Confirm voltages, currents and module compatibility with the selected inverter.

Output must be assessed for the actual roof, its orientation, shading and condition. Tariffs depend on the grid, product and contract; a cantonal average does not replace your bill.

Building procedures: Sion

Reserve space and access for inspections and future replacements. Identify the service contact and stated response times after commissioning.

A serious estimate specifies who prepares the announcement, who manages the connection, who follows the administrative back and forth and how any comments are absorbed into the planning.

In Valais, residential photovoltaics first go through Pronovo; Any municipal aid or other energy measures must be confirmed before signature.

Show chimneys, roof windows and other obstacles on the installation layout. Request a schedule that accounts for weather, access and team availability.

Compare installers: Sion

When comparing installers, check the stated production assumptions. Then check the written allocation of responsibilities. These details matter more than the advertised price alone.

The quality gaps are quickly seen in the annexes: level of technical inspection, self-consumption assumptions, electrical diagram, service after commissioning and clarity of service limits.

Before choosing an installer, ask who attends the site after a fault, the travel charges and stated response time. A registered office address does not establish service availability for your building.

Define included and excluded work during the technical survey. Confirm the supporting structure, anchor points and mounting design.

Places cited on this page — confirm service coverage

Sion

Frequently asked questions: Sion

Prepare these questions about the roof, costs, storage and procedures before comparing offers.

What should I check during the roof survey?

Use the building’s hourly consumption to size the project. Request a schedule that accounts for weather, access and team availability.

How should I compare self-consumption and exports?

Compare avoided purchase costs and surplus export prices with your hourly demand. Self-consumption reduces purchases when generation is used on site; the choice also depends on full cost and losses.

How should I assess adding a battery?

First compare an option without storage for the same demand. Request plans, equipment references and service boundaries before accepting a price. Include the constraints identified during the survey in the quotation.

Which procedures should I confirm for this building?

The procedure depends on the plot, building and integration. Present the plan to the municipality to confirm notification or permit requirements and any protection constraints before ordering.

What should I request from installers?

When comparing installers, check a detailed comparison of each quotation item. Then check the safety measures appropriate for the roof. These details matter more than the advertised price alone.

Guides to nearby towns

Savièse Grimisuat Conthey Vétroz Ayent

Prepare your solar project: Sion

Compare detailed offers, check the construction method and lock in the right order between roofing, quotes and procedures.

Get serious offers Read the quote guide