Solar panels in winter: what really matters
Many people assume solar panels are useless in winter. The opposite is true: cold temperatures actually improve the efficiency of solar modules. PV cells work better physically at low temperatures than in heat.
In a Swiss winter, a well-oriented system typically produces 10–20% of its annual output. For an 8 kWp system, that is still 800–1,600 kWh over winter.
Winter share
10–20%
Efficiency in cold
+5%
December/January
200–400 kWh
Snow slides off
from 35°
Snow on the panels: a problem or a minor issue?
Snow on panels temporarily reduces output. But in practice: with a tilt angle of more than 35°, snow typically slides off by itself within 1–3 sunny days. The black module surface also heats up and melts the snow cover.
For flat roofs, we recommend mounting at 15–20° tilt to minimise snow accumulation and maximise winter production.
- Tilt from 35°: snow slides off naturally
- Black surface actively melts snow
- Flat roofs: 15–20° tilt recommended
- New bifacial modules use snow reflection
The 2026 winter power bonus: new subsidy for steep installations
From 2026, the Swiss federal government rewards solar installations with steep tilt angles (from 60°) and good winter production with a winter power bonus. South-facing walls and steep roof installations receive up to 20% more subsidy.
This bonus is especially relevant for alpine regions, where winter lasts longer and snow reflection boosts production further.
Steep installations from 60° tilt receive a 2026 winter power bonus of up to 20% additional EIV.
Annual production in Switzerland: summer vs winter
A typical 8 kWp system in Zurich produces around 900 kWh in June and around 180 kWh in December. The ratio is 5:1, but even the December contribution matters – every kWh saved avoids grid electricity at CHF 0.28–0.34/kWh.
- June (Zurich): ~900 kWh
- December (Zurich): ~180 kWh
- Ticino December: up to 280 kWh
- Grisons (altitude): up to 320 kWh thanks to snow reflection
Get solar working year-round – request a quote now
A modern solar system produces electricity 12 months a year. Get 3 free quotes now and benefit from the 2026 winter power bonus.
Request a free quoteFAQ
Does my solar system produce electricity in winter?+
Yes, definitely. Even in a Swiss winter, a well-oriented system produces 10–20% of its annual output. Cold temperatures actually improve cell efficiency.
Do I need to remove snow from my solar panels?+
Generally no. With a tilt angle over 35°, snow slides off by itself within 1–3 sunny days. The black module surface helps melt snow actively.
What is the 2026 winter power bonus?+
The Swiss government rewards steep installations (from 60° tilt) with a bonus on the EIV subsidy from 2026. These systems produce proportionally more in winter and receive up to 20% extra subsidy.
Is solar worth it in a snowy canton like Grisons?+
Yes, even more so. Snow reflects sunlight onto the panels (albedo effect) and increases yields. Grisons installations often produce more in winter than those on the Swiss Plateau.