You missed a huge part of my comment: it would take 20 (not 15) years of global battery production to get the United States to have enough storage to reach 80%

You missed a huge part of my comment: it would take 20 (not 15) years of global battery production to get the United States to have enough storage to reach 80% renewables generation. As in, if we stopped manufacturing smart phones and electric vehicles and dedicated all batteries produced in the entire world, then it'd take 20 years to fulfill the storage required to reach 80% renewables for just the United States. We would still need to build storage for the rest of the world! And that still leaves us with 20% of our power coming from fossil fuels. To get to 0% we need 3 weeks of storage not 12 hours. Even if battery production increased tenfold, it'd take 80 years of global battery production to fulfill the storage demand to get only the United States to 100% renewables. And the US only makes up ~1/5th of the world's energy consumption. To get the entire world to 100% renewables it would take 4,000 years at current levels of battery production. Even if battery production increases tenfold, or one-hundredfold it would still take much longer than the 15 years it takes to set up a nuclear power plant. Like I said, if you're worried about how long it would take to decarbonize, stay well away from intermittent sources of power. Nuclear power plant construction has high latency, but you can build multiple plants at once: France took about 15 years to bring it's nuclear power generation from 10% to over 80%. Each individual plant took year to builds but in aggregate France built a nuclear plant every 100 days.