http://www.guc.com/tips/operating_costs.html
I'm not sure how current the info. is, but the price for electricity is given at the bottom and (unless you have really new, efficient, appliances) I'd bet the electric consumption rates are pretty accurate. If you know your electric rates (should be on your bill) you can convert to be closer to the actual cost in your area. (If you need help on the conversion let me know . . . I'm a stay-at-home mom who spent her "former life" as a physics teacher
)