Less than .1% to secure more than 500 billion of value. Bitcoin energy usage is primarily to secure the network, not for transaction "volume", but that's a common misconception for people who have yet to learn about bitcoin.
You're splitting hairs. If the energy is needed to stave away a 51% attack, that's the energy needed to support the single digit tps monstrosity you have. As for the 500 billion in value, I doubt if everyone liquidated their positions today it'd amount to a figure remotely close to that.