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Had it for decades here in the Netherlands. It actually is two separate meters with different rates for each. Most appliances have the ability to switch on when the low rate kicks in and that is a fairly common way of operating. For example, our dishwasher (which heats its own water) is set to come on when the rate is low....
I think if widespread use is there, it becomes a good way to balance the load and make the overall system more efficient.
D.
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