https://peercoin.site/#energy
As much as I am a Peercoin fan, I consider this table a bit unfair, because Peercoin for now does not have the same utility/transaction volume/market cap like Bitcoin, and so it cannot be compared directly in my opinion.
But two simple indicators would solve that:
- hashrate / power consumption per million transactions/year.
- hashrate / power consumption per million USD of market cap. Here I can do the math myself:
--- Bitcoin: 7679050104 Ghps / 69079 MUSD: 111163.3 Ghps/MUSD
--- Peercoin: 1987556 Ghps / 34 MUSD: 58457.52 Ghps/MUSD
(that is roughly about half, I know that is less "advantage" that some want to see/show, but as far as I know the curve of hashrate growth that is to be expected is less steep because of the dynamic PoW reward that falls when hashrate/difficulty grow. )