Renewables will not cover your usage.
False. Multiple countries are already able to run on 100% renewables for prolonged periods of time. The bigger issue is what to do with excess power. Battery solutions can cover moments where renewables produce a bit less power.
It’s because we stopped building them. We have academic knowledge on how to do it but not the practical/technical know-how. A few countries do it because they’re doing a ton of reactors, but those don’t come cheap either.