The provided article text does not actually contain the story about the power grid — it consists only of the Daily Mail's website navigation, headline menu and a list of unrelated stories (covering topics such as a Berlin Pride parade incident, UK tax policy, and celebrity news). No paragraphs describing the claims about the national power grid being "out of control" or "on the brink of collapse" were included in the supplied text.

As a result, I cannot accurately summarise the actual content, quotes from insiders, or details behind the blackout warning referenced in the headline, since that material was not present in what was extracted. A reliable summary would require the full body text of the article itself.