There was no such shortage if you only look at instantaneous figures and ignore the fact that a substantial proportion of the grid's generation capacity was in

There was no such shortage if you only look at instantaneous figures and ignore the fact that a substantial proportion of the grid's generation capacity was in the process of rapidly disappearing due to a predicable daily process called "sunset", as the article does. See my other comment. I suspect the person you're replying to might be right.