My ComEd bill averages about $175 a month -- this is including the summer months, and I have the A/C set at 75*, and 71* for sleeping; this is for me and not the fish.

Also included in this is an 1,000 watt power amp for my home stereo that is on at least 5 hours a day. Also, the girlfriend works from home, so power is being used all the time.
For tanks;
40 breeder 6*39 T5, 2 MP10's, skimmer, heater, fuge light and return pump
65 2*250 MH+2*96 PC, 2 MP10's, skimmer, heater, fuge light and return pump
75 2*250 MH+4*54 T5, 2 MP10's, skimmer, heater, fuge light and return pump
Should note that my town just approved a switch to a different electric co. and the rates are suppose to drop - 10-30%.