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Because not everybody is using their A/C at 9p.m. Most office towers turn off their AC in overnight (or turn it down dramatically). Businesses are increasingly closed and using less power. The manufacturing plants that are working one shift have shut down for the day, and so on.
Home AC is just a small part of the equation, industrial AC is the bull in the China shop and its use decreases dramatically outside of normal business hours so shifting electrical needs outside of that window can help.
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