Proof of Stake (PoS) and Proof of Capacity (PoC) exist and are actually deployed for quite a while now. They don't consume lots of electricity and can be runned

Proof of Stake (PoS) and Proof of Capacity (PoC) exist and are actually deployed for quite a while now. They don't consume lots of electricity and can be runned on cheap hardware. I run 2 PoS wallets on one of my computers. It doesn't affect it much, though not all coins are equal (some consume more resources). It just have to stay on.