When I think of the power cuts during the ‘70 Labour era it always takes me back to going around one particular supermarket with a candle attached to the handle of the supermarket trolley.I understand your point and spent my early years living outside London. I am sure we had electric train going into Waterloo (third rail, just checked on wiki and my part of the line was electrified in 37) but we were also sitting on millions of tons of coal to fuel the steam trains. Not forgetting 2 wars.
Just a thought, you like I enjoyed many nights of power cuts, st the time were we producing enough electricity to power the rail? Many houses were still using gas for lighting. As a total drift I was in a restaurant two months ago that still had gas lighting was was using it for that purpose.
At that time we only had a coal fire at home, so the lack of electricity didn’t affect the heating, and using a toasting fork to make toast on the living room fire was good fun.