...
On top of that, the chips get 3.2 watts per GH/s...3200w for the 1TH/s. Let's shoot for a normal-(ish) $0.15 per kWh price (which would probably be quite high for a datacenter), which would put the cost per month at $345, or $4147 a year.
Except, 480 GH/s minirig with 128 chips pulls 2000W from the wall. So 1TH/s would require 40A circuit.
And the electric bill for 1TH/s would be north of $5K/year