This is where stationary storage (via batteries) makes a lot more sense. In Australia, the same problem exists, but they have an giant ozone hole so even more UV hits the surface. Tesla deployed what (at the time) was the biggest battery storage project in the world. They built a 100MW/129MWh battery setup with their Powerpacks. In another part of Australia, they're deploying a "virtual power plant" by equipping up to 50,000 homes with individual home battery backups via Tesla's Powerwall product. The grid operator will be able to tap into each of these batteries to redirect power to the grid or shift load off of the grid whenever they see necessary. This is resulting in massively improved prices for electricity in South Australia where they had a lot of rolling blackouts (due to the heat) last summer.

The newly released Tesla Megapack https://www.tesla.com/megapack seems like a slam dunk for this sort of thing. You store that crazy amount of sunshine that is excess in batteries and use them that evening or the following morning. The economics of this approach are becoming more and more realistic due to better technology and better manufacturing.