I have an IPhone app for that (Reefcalc). Says $355 a year using $.082 a KW/h.(I added a 100W heater on for 6 hours 6 months of the year) That's not terrible at all.
In my townhouse my son had turned a baseboard heater on max downstairs in the landing, never felt it on, but sure felt the hit with the bill, was over $50 to have that thing on 24/7. Check around for weird stuff like that.
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