Doesn't have to be greater than winter usage to be problematic. All it takes is several unfortunate events occurring at the same time—the kind of curve ball father time likes to throw occasionally. Say, extra hot weather, little wind which leaves wind power lacking, a few gas power plants out for technical reasons or supply shortage and then throw in baseload nuclear power plants short on water.. Unlikely? Yes, but unlikely events occur all the time. And for something essential as electricity..such a risk should be taken seriously, not dismissed out of hand as a "non-problem"