There's lots of guessing going on that's not worth taking any notice of. Few people today remember or have ever known what happened in the 1970s when we had a very successful cuts program.Peak lopping is not the same as usage reduction.
I keep seeing claims that three hour cuts will reduce absolute usage. Not just time shift it.
Plus, if solar is producing, we actually want a demand peak, just earlier. (Probably either side of noon.) If wind is producing, we actually want a demand peak round about its maximum - though that could be brief or last for many hours.
I can easily shift things like my washing machine usage to whatever time helps. Also, at least some cooking which I can often reduce to a little bit of reheating at dinner time. But they do have to let me know!
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I'm sure we we won't be having 3 hour cuts, that's too long and creates wastage as you've remarked.
The 1970s pattern was three 2 hour cuts in each 24 hours in a revolving program something like this:
Day one for a zone:
Cuts at midnight, 8am and 4pm.
Day 2:
Cuts at 2am, 10am, 6pm.
Day 3:
Cuts at 4am, 12noon, 8pm.
Then back to day one repeating, basically losing 2 hours of current every 8 hours. This gave everyone a fair share of the most inconvenient and most convenient cut times. And it did the trick, got us through the crisis.
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