I've recently been hearing a lot about mining, consuming energy that either would not exist otherwise, or would be wasted. For example, places in Africa can build like a hydroelectric power station, but don't have the money to run lines far enough for all the energy from the power station to be used, so they give most of it to a crypto mine and let the residents use the rest. If the residents ever need more power, then the crypto mine can shut down temporarily or slack off on their usage in order to provide the residents with more power.