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Mining a block would require specifying who you bought your power from, and the price (negative!) paid - i.e., a pointer to the relevant transaction - in addition to the standard things done in mining.
Lots problems with this. Still, an amusing idea, and if it could be made to work would address two big problems simultaneously.
(Context for all this: a huge problem with renewables is that they can be difficult to turn on and turn off. Both California and Germany, which have large renewable components to power, often have to pay other regions to take power off their hands, lest it overwhelm the grid.)
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