The Historian (other household member) and I have been preparing for this for a while (they grew up in Africa and are used to things like load sharing and I was a kid in the 70s with older parents who had been kids in WWII). Over the last few years this includes stores of candles, power banks, rechargeable solar lights, wind up/usb/solar radio, Kelly Kettle, wonderbag (works on the old haybox principle, you start a stew or whatever off on the stove, then put it in the box or wonderbag and the insulation does the rest), heavy window curtains, door curtains, enough fleeces, sleeping bags and wool blankets to sink a container ship, gloves, hats, socks, layering...we don't have central heating, just a small number of radiators and humidifiers we can move around as needed and an Energenie plug you can program with the price per kilowatt to get an idea of cost. We can't have solar panels due to the terms of our lease but we are now looking at portable solar panels and stand alone sockets and some of the newer batteries which look very promising if the governments of the world don't shut them down or otherwise suppress them. It also probably helps that I read and watch a lot of science fiction (and I do mean science fiction, not science fantasy).
Our ancestors didn't have all this here electricity and they survived....it's undoubtedly all going to come as something of a shock for many though, financial or social.
It does infuriate me that some of this could have been avoided if greedy governments and oligarchs had allowed more investment in alternative power sources earlier on. But as we don't have much trust for governments in this household and the current English government has shown time and time again how much they despise people not in their same social class we know our best bet is to be as prepared as we can be.