Alpine solar power plants are a huge deal right now, and cause a lot of discussions. They provide big benefits over solar on rooftops in the valley, because they are usually above the fogline and provide better efficiency during winter.
This is the first alpine solar power plant that's fully operational since August: https://www.axpo.com/ch/en/about-us/energy-knowledge.detail.... It's mounted on a dam and thus had less issues with permissions (as it's mounted on an already existing structure with existing power infrastructure).
Here's an English article about two big planned projects in Gondo and Grengiols: https://www.swissinfo.ch/eng/mountaintop-solar-farms-spark-t...