.. but we've already done that 5 to 25% increase. Without significant storage. Storage will be needed to get to 100%, but we've already displaced all the coal generation with renewables! (and, I admit, some gas)

Don't let the best be the enemy of the good. Keep expanding the renewables until 0-carbon moments are possible and curtailment starts to be a problem. Maybe 50%?

(or, in meme format: noooo, you can't just replace everything with renewables! haha wind turbine go brrr)