Look. All current coin transactions are handled by the miners. If this were not profitable, then all the mining capacities would be turned off. And if someone is engaged in mining, it means that it is profitable.
Earlier, equipment for mining paid off for less than a year, now this time has increased.
Mining will be profitable as long as the profit from it is more than 0. And such projects that can provide free or very cheap electricity immediately put their investors in a more profitable position in relation to other miners.
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Electricity is completely free of charge can not be. Only if the owners of the plant are in part in the share with the miners. Otherwise, it is more profitable for them to sell it to other campaigns.