Hi, new member here, though long term lurker.

Here in London UK, power failures are quite rare though they cause total chaos as no one is prepared.

At my workplace I keep battery lanterns and flashlights with batteries for a few days.
Have a UPS in the office/workshop with a large external battery, this allows 24 hours mormal use of broadband router, pc, desk lamp and desk fan.

At home near London I am off grid anyway (large PV and battery system) so would hardly notice the difference!

Although power cuts are rare, the prospect of a long term one is very worrying, it would not directly affect me that much, the lack of food, drinking water, public transport, and communications would be the worry.