To put that in perspective it's roughly $0.60 a day, $18 a month and $219 a year USD assuming a rate of $0.10 per kilowatt hour [1] plus an additional 853 BTU/hr cooling load on the AC system [2].
Rates in California would be double that or more, depending on which tier this put the user. For me, my old 8-cpu Xeon server cost me ~$50/month in electricity so I decommissioned it, however, this would also push me towards wanting to get solar panels for the house.
[1]: http://www.rapidtables.com/calc/electric/electricity-calcula...
[2]: http://rapidtables.com/convert/power/Watt_to_BTU.htm