Threat of blackout - fact or fiction?

On 8 January 2021, Europe came within a hair's breadth of a potentially catastrophic blackout. Even though our technologies helped to save the day, what experts have been warning about for years has been on everyone's lips ever since - daily newspapers, magazines, TV channels and social media have been talking about the spectre of a blackout. Is it scaremongering or is there really something to it?