Much less? Bitcoin currently powers almost none of the world’s transactions, yet consumes all that energy.
The entire us consumes 75 twh in a year, the same as bitcoin’s global energy use.
Of that, the entire commercial sector is about 12 twh. That’s not just banks. That’s every company. Banks alone are surely far less. Maybe 2-3 twh? And the us is 15% of global gdp. So, global finance might consume about 14-32 twh.
Again, that is while doing all of global finance. Bitcoin powers a rounding error of transactions yet consumes 75 twh.
There’s just no comparison energy wise. My math could be off by several orders of magnitude and bitcoin would still consume more if it were actually powering the world’s transactions.