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Some of the industrial and heavy commercial sector already operates this way.
Some areas around North America are heading this path for all users.
It is called "Time of Use Metering."
In short, at night electricity on the grid is in surplus and sells cheap -- about 1/2 or less of daytime use. Some large office buildings freeze water into ice in their basement overnight -- when electricity is surplus and cheap -- and use the ice to cool the building during the day -- when electricity is expensive.
Sort of like how most Cell phone billing works, but Cell phones usually go to "free" overnight.
But tallrick is correct, on-site power generation takes care of this upfront.
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