> Even in daytime, I think you need storage to get rid of those, right?

Suppose that solar generates only during the day and only when it's not cloudy, and it's cloudy e.g. 10% of the time. Then you're using natural gas at night, but those natural gas plants still exist during the day, so you can also use them on the 10% of days that are cloudy and you're still replacing 90% of the daytime demand.