Are you interested in which canton in Switzerland boasts the most clean energy sources? You can work with a dataset on renewable power plants from the Open Power System Data platform. It lists the power sources currently operating in each canton, grouped into bioenergy, hydro, solar or wind, along with a few more attributes.
If you want some ideas how this type of data can be visualized, here’s an article where a somewhat similar dataset was used.
Data: Swiss Clean Energy Sources
geoJSON file: Swiss Cantons