This question is focused on high quality solar panels (certified Tier 1) which are more and more mainstream. The 25 years warranty is becoming standard, and producers describe degradation in 25 years charts. What happens after 25 years? Is degradation expected to be constant for another decade or two, or is there some likeliness of speeding up and falling down from linear progress? Sure total panel failures can be expected too, and estimate of that can be included to make the picture more robust. Anyway, how do solar panels degrade after 25 years of warranty?