alt Hacker NewsWe don’t need to invest an ever increasing amount in solar panels to transition because existing panels degrade slowly. Scale things out another 20 years and at current rates solar will have squeezed out just about everything else.
Sure, we can always move faster but hydro and wind limit how much solar we actually need. Batteries have cycle limits so even if wind is unreliable producing power at 2AM just to increase battery lifetimes makes sense.
20TW is roughly current world marketed energy consumption. But, on Earth, solar power plants have a capacity factor around 20%, so you need 100TW of solar panels to produce those 20TW. Moreover, we should expect human energy consumption to continue to grow, not suddenly become constant, especially since solar energy is so much cheaper than older sources of energy; 20 years from now we might need four times that much, depending on how AI works out. In that case you'd need to produce about 400TW÷20 years = 20TW/year.
According to the IEA, we currently have only about 1.5TW/year of manufacturing capacity: https://www.solarplaza.com/resource/13581/article-global-sol...
Hydropower is already scaled nearly to its limits, and wind energy is useful and important, but is dropping in cost much more slowly than solar, and it's tapping a much smaller resource.