Add a new rate zone over a certain kwh

This kind of capability is referred to as “Tiered Billing”. There’s already a Wish List item for it here:

You should “Like” the original request to get your vote in.

BTW - I think the number of tiered rate plans in the US are beginning to wane. Many utilities are trying to replace them with TOU rate plans that better reflect the cost structures for their energy sources.

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