Just check your state.. almost all states have "residential, commercial, and industrial" rates. Industrial is usually the cheapest. In SC where i am the average is .11cents residential, .08 for commercial, and like .05ish for industrial.
Large miners are supra-industrial and will often have negotiated rates lower than this. Supposedly 5.57 cents in Texas, and mining numbers are lower.
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Not to mention they usually negotiate contracts to buy a certain amount of energy whether they use it or not. And then there are contracts to curtail usage to account for. It can get complicated af
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Texas has its own grid not subject to interstate commerce regulation
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