From costs to yields

Solar integrations are profitable investments. The reasons for this are, firstly, that the additional investments compared to conventional building envelopes represent a fraction of the total project costs. Secondly, solar building envelopes generate yields and amortise within a few years. In the period after that, they generate earnings and become profitable power plants. Two examples.

Example 1

Single-family home in Basel-City CH, Roof covering energetic roof renovation with LEVEL (10 kWp)

Costs for 60m2 roof area Tiled roof Solar roof
Construction site equipment (scaffolding, lifting equipment, etc.) 4'500 CHF 4'500 CHF
Insulation and sub-roof 10'500 CHF 10'500 CHF
Roofing material 2'400 CHF 13'600 CHF
Roofing labour 3'000 CHF 3'000 CHF
Electrical installation 0 CHF 5'400 CHF
Planning & project management 4'000 CHF 5'500 CHF
Subsidies - 3'000 CHF - 10'500 CHF
Tax benefit - 4'700 CHF - 7'100 CHF
Net investment 16'700 CHF 24'900 CHF
Net revenue over 40 years 0 CHF 60'000 CHF

Difference
Net investment: + 8'200 CHF
Net revenue over 40 years: + 60'000 CHF

Example 2

Office building in Basel-City CH, facade renovation with FAST (116 kWp)

Costs for 1'400m2 facade area (window share: 50%) Ceramic facade Solar facade
Construction site equipment (scaffolding, lifting equipment, etc.) 20'000 CHF 20'000 CHF
Curtain wall facade (insulated, installed, 700m2) 280'000 CHF 336'000 CHF
Windows (triple glazing, installed, 700m2) 238'000 CHF 238'000 CHF
Electrical installation 0 CHF 28'000 CHF
Planning & project management 30'000 CHF 38'000 CHF
Subsidies
Subsidy for energy-efficient facade renovation - 84'000 CHF - 84'000 CHF
PV subsidy: One-off remuneration - 0 CHF - 37'000 CHF
PV subsidy: «Inclination angle bonus» - 0 CHF - 29'000 CHF
Net investment 484'000 CHF 510'000 CHF
Net revenue over 40 years 0 CHF + 348'000 CHF

Difference
Net investment: + 26'000 CHF
Net revenue over 40 years: + 348'000 CHF

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