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My view here is, it's practically impossible to see free electricity anywhere. Because any transmitted or distributed voltage is at a cost.
Even if you are using solar, you must procured a panel and battery to store power.
Hash rate is like a weapon's power in a war. So, relying entirely on the hash rate generated by solar panels, it's impossible to be a truly profitable Bitcoin miner, even if I were to join a pool. I've calculated this scenario with the most realistic ROI possible. In short: if mining this way (on a retail scale) made sense, everyone would be mining.