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.

Workshop with 10 employees

Location: Lausanne

Orientation: west

System: NICER roof-integrated system

Module type: glass-film, with frame

Colour: deep black

Surface: 300 m2

Power: 52.8 kWp

Annual yield: 51'000 kWh

Gross investment incl. VAT:
CHF 108'000

Substitution conventional roof:
CHF 23'000

Net investment: CHF 85'000

One-off grant1: CHF 19'552

Return2: 6.2%

Break even: 15 years

Profit over lifespan:
CHF 111'000

Office building with 20 employees

Location: Zurich

Orientation: east

System: FAST facade system

Module type: glass-glass, frameless

Colour: slate grey

Surface: 500 m2

Power: 75.0 kWp

Annual yield: 40'000 kWh

Gross investment incl. VAT:
CHF 371'000

Substitution glass facade:
CHF 297'000

Net investment: CHF 74'000

One-off grant1: CHF 27'100

Return2: 11.5%

Break even: 8 years

Profit over lifespan:
CHF 231'000

1 One-off grant
The one-off grant is a subsidy model for solar systems by the Swiss federal government. It covers around a third of the investment. Additional contributions from the buildings programme for energy-efficient renovation are not yet included.

2 Rate of return
Yields and returns are project-specific and depend on factors such as irradiance values, project design and development of electricity prices. They take into account inflation, capital costs, discounting, tax benefits and reinvestments. Customized profitability studies can be provided upon request.