It will almost certainly be less than bitcoin. What bitcoin is trying to fix is decentralized trust and uses Proof-of-Work for that. So, you're wasting energy

It will almost certainly be less than bitcoin. What bitcoin is trying to fix is decentralized trust and uses Proof-of-Work for that. So, you're wasting energy to solve some cryptographic puzzle to proof that you did some work. Traditional banking does not need that, it uses social networks to establish trust.