To be fair, if all the customers in a colo used the amount of bandwidth
they predicted they would at the rate they would, current facilities would
be out of capacity after a few dozen racks. Most customers can't predict
for squat, so when a real figure comes along it takes more work to make
sure its believable.
OK. Your estimate might be correct for some companies. With my company,
if a customer doesn't have a clue what they're going to draw, we monitor
them like a parole officer on steroids so there are no
misunderstandings. Power is just as easy if you understand how to measure
it. Get a new piece of equipment, measure its drain. "Profile" it if you
will.