At least how I understand it, for POW coins like bitcoin and ethereum miners maintain the blockchains and nearly 100% of the work done is essentially busy work to show proof of work. In contrast, Hive is run by nodes which do nothing but maintain the block chain. No busy work, just useful work. All the transactions done on Bitcoin could probably be done on Hive for the power it take to run a single home, where as Bitcoin mining alone is estimated to use as much enough as not so small countries. https://www.marketwatch.com/story/after-recent-price-spike-the-energy-to-produce-bitcoin-could-power-a-country-of-more-than-200-million-people-11609244670
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