I’ve generally just asked someone to show me an analysis where wind/solar can handle something like a cold snap or time when wind basically doesn’t happen for d

I’ve generally just asked someone to show me an analysis where wind/solar can handle something like a cold snap or time when wind basically doesn’t happen for days on end? Just go without power?There are currently so grid scale batteries that can go days without “good” conditions where your solar/wind are only performing at 20% rather than 60-70% ? If wind/solar is 80% of your mix you’re gonna have a bad time. Do you keep the old fossil fuel plants around “just in case”?who is going to pay for that?