Regional service
Flat-Roof Photovoltaics Wallis – Loads, Roof Protection and Mounting
Flat roofs in Canton Wallis offer large PV potential – provided mounting angles, wind loads and maintenance access are aligned before installation. Exactly this planning step decides yield, roof protection and later maintenance.
Clarify before quoting
In Canton Wallis, flat roofs on commercial buildings and multi-family homes represent the largest untapped solar area. Valais relies heavily on solar energy and has integrated MuKEn 2014 into its cantonal energy law. The canton positions itself as the "battery of Switzerland" – the combination of hydropower and solar electricity is to enable year-round renewable supply.
Flat-roof photovoltaics in Wallis requires technically coordinated planning: wind load verification per SIA 261, roof membrane protection and SUVA-compliant fall protection are fixed components of every Vigorek project. The choice between east-west and south orientation is calculated individually based on available roof area, self-consumption profile and ballast requirements.
Prefer to contact us directly? Send your property address, annual electricity consumption (if known) and preferred timing. Roof photos or existing plans help with the initial assessment.
Project profile
Location
Wallis
Service focus
Flat-Roof Photovoltaics
Regional fit
Wallis
Context
How this service works in Wallis in practice.
Wallis comes with its own framework conditions – from incentives and tax treatment to technical requirements. From those, a cleanly managed project flow for your property takes shape.
Service focus
What matters most for flat roofs
Flat-roof PV demands more than module rows on paper: wind load verification per SIA 261, roof membrane protection and SUVA-compliant fall protection are part of every Vigorek project scope. For multi-family buildings, commercial properties and industrial halls in Switzerland.
- Mounting concept based on wind zone, snow load and roof-edge clearance – ballasted or penetrating, with a traceable wind load verification per SIA 261.
- East-west or south layout matched to available roof area, self-consumption profile and ballast requirements – with realistic yield ranges rather than averages.
- Protection concept for the roof membrane (separation fleece), maintenance walkways (min. 20 cm foot clearance) and SUVA-compliant fall protection with guardrails from 1 m height.
- Structurally coordinated planning: PV dead loads, snow and wind loads per SIA 261, and existing roof structures – verified as a requirement, not an option.
Regional framework
Why this canton shifts the priorities
Valais: the solar superlatives. ~2,000 sun hours (sunniest canton). Alpine radiation at 2,000m = up to 300 kWh/m²/year (comparable to southern Spain!). Gondosolar: 1,500 solar trees, 18 million kWh/year, 55% winter share. Vineyard agri-PV as innovation.
- In Canton Wallis, load distribution, wind uplift and roof-skin protection must be resolved before ordering materials.
- Flat roofs require a different mounting concept than pitched roofs – standard solutions often lead to change orders.
- Maintenance paths and accessibility determine the long-term operating costs of the system.
Project logic
How structure and roof membrane are planned together
The order records these steps, responsibilities and required documents. Outstanding assessments belong in the schedule before work begins.
- Roof inspection assessing statics, roof skin and existing installations.
- Mounting geometry aligned with wind zone, tilt angle and usage concept.
- Protection concept for roof skin, walkways and future maintenance access.
Regional context
Flat-Roof Photovoltaics in Wallis: what matters here
In Canton Wallis, cantonal rules, the responsible grid operator and local permit procedures shape how a project is planned and delivered. The points below show what really matters before quoting, installation and handover.
- Regional starting point
- In Canton Wallis, incentives, grid operators and permit procedures change the priorities for this service.
- Service core
- Flat-roof PV is not a standard grid: wind load, ballast, roof membrane protection, walkways and later access define the design.
- Grid & registration
- For Canton Wallis, grid operators such as EnBAG, EW Obergoms, metering concept and commissioning are aligned early.
- Decision reason
- In Canton Wallis, load distribution, wind uplift and roof-skin protection must be resolved before ordering materials.
- Execution
- Roof inspection assessing statics, roof skin and existing installations.
- Economic frame
- Feed-in tariff and self-consumption are matched to the property; in the canton, EnBAG 2026, unter 80 kVA: 14.00 Rp./kWh Sommer / 6.5 Rp./kWh Winter, exkl. MWST; zusätzlich 1.5 Rp./kWh HKN bei Übertragung. Andere Walliser Netzgebiete: Tarif beim zuständigen VNB prüfen. is one relevant reference point.
Cantonal framework
Which cantonal framework shapes the project in Wallis.
The technical service stays the same, but the project frame changes with the canton. That is exactly where incentives, tax treatment and MuKEn requirements become strategically relevant.
Local context
Wallis sets the economic pace for this service.
Valais has the highest solar irradiation in Switzerland – Sion counts over 2,100 sunshine hours per year. Alpine systems like those on the Muttsee dam wall or at Gornergrat demonstrate the enormous potential for winter electricity production in the Valais Alps.
Tax and subsidy logic
In Valais, solar systems are fully tax-deductible as energy-saving investments. The high solar irradiation ensures short payback periods of often only 8–10 years – the tax deduction further accelerates this. Solar obligation for new buildings: under federal Art. 45a EnG, new buildings with a chargeable floor area over 300 m² must install a solar system (photovoltaic or solar-thermal) on the roof or façade (for permits filed from 1.1.2023); the cantons set the exceptions and the specific minimum area. In the canton of Valais the area of the solar panels or thermal collectors must cover at least 40% of the chargeable building area (cantonal energy ordinance, formerly Art. 28a VREN, kEnV since 1.1.2025). In addition, the cantonal energy law (kEnG, in force since 1.1.2025) introduces a self-generation obligation for new buildings: at least 20 W/m² of energy reference area, with no power above 30 kW being required. Mainly thermal subsidies at cantonal level.
Permits and energy law
Solar obligation: federal law (Art. 45a EnG) requires a solar system on the roof or façade of new buildings with a chargeable floor area over 300 m² (for permits filed from 1.1.2023) — the cantons set the specific minimum area; in Valais at least 40% of the chargeable building area (cantonal energy ordinance, formerly Art. 28a VREN, kEnV since 1.1.2025). In addition, a cantonal self-generation obligation applies since 1.1.2025 (at least 20 W/m² of energy reference area, no requirement above 30 kW). Gondosolar and large alpine systems: Solarexpress procedure. Vineyard agri-PV: flexible regulations. Normal notification procedure for standard systems. Valais relies heavily on solar energy and has integrated MuKEn 2014 into its cantonal energy law. The canton positions itself as the "battery of Switzerland" – the combination of hydropower and solar electricity is to enable year-round renewable supply.
Market signal and location
Valais: the solar superlatives. ~2,000 sun hours (sunniest canton). Alpine radiation at 2,000m = up to 300 kWh/m²/year (comparable to southern Spain!). Gondosolar: 1,500 solar trees, 18 million kWh/year, 55% winter share. Vineyard agri-PV as innovation. Valais offers special subsidies and simplified approval procedures for alpine solar systems. Besides the Pronovo one-time payment, the canton subsidizes storage solutions and large projects. The Service for Energy and Hydropower (DEWK) provides comprehensive consulting.
Sun hours/year
~2'000h SONNIGSTER Kanton der Schweiz!
Further reading
Service and location details
Whether you want to go deeper into the service, explore the location context or compare projects in nearby regions – here is where you continue.
Service
Flat-roof PV – service overview
Mounting, roof protection and project logic for flat roofs at a glance.
Location
Canton Wallis – overview
Regional incentives, grid operators and framework conditions in Canton Wallis.
Service
PV installation
The right entry point for general mounting questions.
Hub
Location overview
More regions and locations at a glance.
Guide
PV solar obligation in Valais
Classify 20 W/m², the 30 kW cap, 500 m² roofs and roof-renovation exemptions under the cantonal Energy Act and Ordinance.
Guide
PV feed-in payment in Valais
Separate EnBAG summer and winter rates, HKNs, TOP-40 and federal minimum payments for the 2026 profitability calculation.
Nearby regions
The same service in other regions
Vigorek delivers this service in neighbouring cantons and municipalities too. Depending on location, subsidies and conditions can vary – a comparison is worthwhile.