It may be interesting to know what people pay for Electricity in various parts of the US.

In order to make comparisons we would need some guidlines:

1) Total Horse Power of your Equipment
2) Line Voltage (220 or 480)
3) Number of Hours of operation per month

Equipment efficiency varies a great deal, as well as power company rates.
But it may be interesting to see these costs relative to your location.
You Electrical guys, let me know what I am missing...