Many newer cryptocurrencies use Proof of Stake vs. Proof of Work. PoS is much more efficient than PoW. https://ethereum.stackexchange.com/questions/118/whats-t

Many newer cryptocurrencies use Proof of Stake vs. Proof of Work. PoS is much more efficient than PoW. https://ethereum.stackexchange.com/questions/118/whats-the-difference-between-proof-of-stake-and-proof-of-work/141#141 https://ethereum.stackexchange.com/questions/118/whats-the-d... So if electricity is the only reason to combat Bitcoin, many other cryptocurrencies should be fine.