Ignoramus5921 fired this volley in
news
I thought 460v was twice cheaper to use than 230v, because of twice
less current.

Ig, it makes the equipment smaller and lighter (if it's solely for 460V),
but watts are watts. Your power meter doesn't measure current (per se), it
totals watt-hours of energy. If current and voltage are in phase with one-
another, a given current at a particular voltage can be used to calculate
watts. Lightly loaded motors and other inductive loads tend to muddy that
by shifting the phases of voltage and current.

LLoyd