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> it is still profitable

> I do not pay for power

I guess you don't run your own solar farm so I assume someone else is paying that for you without knowing.

To play devils advocate, I indeed have solar panels at home (7kW). I use my graphic cards only when it is sunny. However I don't mine ETH but instead contribute to Folding@Home.

That's still power you could either use to charge batteries or sell back to the grid

Nominally, yes, but the actual economical value of doing so is most likely an order of magnitude below what buying the power would cost (sun shining and grid needing more power is only loosely correlated, and batteries take significant time to pay off). Subsidies have a large impact here though.

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