Your units are funny. Using W-hr (energy) and then making it a rate by making it per year which gets you back to power. You could have just said, “the US consumes energy at a rate of 450 GW”.

There’s no need to introduce hrs and years to the mix. Watts describe precisely what you’re attempting to quantify.

https://www.google.com/search?hl=en&q=4+PW+hr%2Fyear+in+GW&o...