I'm in it and all we do is not use the dishwasher, washing machine, tumble dryer and electric oven for that hour. It does mean we change our dinner time (SWMBO doesn't like it - her late father insisted on sitting down at 6:00pm precisely for his meat and two veg).
It's not 17:00-18:30, it varies.
The website says I've saved £1.70 over a couple of sessions, the third and fourth haven't come up yet.
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