Short answer
What you need to know first.
Helps owners in Canton Zug to realistically assess the key economic drivers of a PV system, from self-consumption and current WWZ tariffs to ZEV models, LEG and the Pronovo one-time payment.
Important
Economic promises such as "pays back in X years" are not robust without knowing roof situation, self-consumption profile, current network tariffs and subsidy rates. Since January 2026, compensation at WWZ is based on market-based quarterly prices, projections still using earlier fixed tariffs overstate the feed-in share. Tariff levels, subsidy conditions and programme rules can change annually. The current values can be accessed directly at WWZ (wwz.ch) and Pronovo (pronovo.ch).
Decision points
What determines the right path.
Self-consumption is the biggest economic lever: solar electricity used directly at the point of generation reduces expensive grid purchases. With the WWZ feed-in tariff reduced since July 2025 and market-based compensation from 2026, self-consumption has become even more important than in previous years.
Battery storage increases self-consumption but does not automatically improve economics: a battery shifts surplus power from day to evening, it makes sense when the gain from higher self-consumption offsets the added cost within a realistic timeframe. Tariffs, consumption profile and system costs must align for this to work.
ZEV models are particularly widespread in Canton Zug: owners of multi-family buildings or multi-building areas can use a self-consumption association (ZEV) to distribute solar electricity internally across multiple units, structurally increasing the self-consumption share. Since 2025, the virtual ZEV (vZEV) across plot boundaries is also possible.
Local electricity community (LEG) since January 2026: people in the same grid area and municipality can share locally generated solar electricity via the public grid and benefit from a legally anchored grid fee discount. In Canton Zug, where ZEV models are already well established, the LEG can be a useful complementary model for larger neighbourhoods or commercial areas.
Pronovo one-time payment as a reliable upfront contribution: the one-time payment (KLEIV for systems under 100 kW) is applied for at Pronovo after commissioning and materially reduces the initial investment. It is federally uniform and not specific to Zug, but belongs in every economic assessment, together with the tax deduction for investment costs as property maintenance.
Roof situation, system design and consumption profile determine actual yield: orientation, pitch, shading and available roof area all matter. What counts is not maximum kWp, but a system that produces during actual consumption periods, thereby structurally supporting self-consumption.
Sequence
How the project stays cleanly managed.
- 1
Analyse the self-consumption profilewhen and how much electricity is consumed? Heat pumps, wallboxes or other controllable high-load devices significantly increase self-consumption when they can be timed to match the system's production periods.
- 2
Include current WWZ tariffsthe WWZ feed-in tariff has been 8.5 cents per kWh since July 2025; from 2026 market-based compensation with minimum tariffs for small systems applies. These values are the basis for the feed-in calculation, and should always be verified against the current tariffs on wwz.ch, as they can change.
- 3
Check ZEV or LEG potentialfor properties with multiple units or near other PV systems, it is worth checking whether a ZEV, vZEV or since 2026 an LEG would be economically advantageous. In Canton Zug this is particularly worth considering given the high ZEV density.
- 4
Match system size and storage to the consumption profilethe goal is not maximum roof coverage but alignment with actual consumption periods. With pronounced evening consumption a battery can make sense, with high daytime consumption often not.
- 5
Include Pronovo one-time payment and tax deduction in the calculation: the one-time payment reduces the net investment and should be factored in together with the property maintenance deduction. The Swissolar economic calculator enables a first robust estimate using your own project data.
Checklist
Questions to settle before the quote.
- Self-consumption vs. feed-in: why the market-price shift from 2026 changes the economics
- ZEV, vZEV and LEG in Canton Zug: which model makes sense when?
- Tax deduction and Pronovo: how upfront contributions materially change the net investment
FAQ
Common questions on this topic.
Sources
Official sources & references.
The responsible authorities are decisive. Always verify binding details – amounts, deadlines and conditions – for your specific property against the current status of the respective authority.