Try that again with 99% renewable and it becomes much more reasonable with regards to over overcapacity. 1% non-renewable would be a very good outcome.

One can enable "dispatchable 1" which is simple cycle gas turbines, and limit the total CO2 emission so that's at most 1% of the generation. Doing that, and with no hydrogen, solar curtailment is reduced by more than half, to 8.1%.