I looked at the bills for the past 5 months I've been living in this poorly-insulated, ~1000 square foot 2-story townhouse, in the deep south, where air conditioning is essential. Four of those 5 months have been very hot, it's only recently got cold this last month (I used 680 kWh in November, peak was in September at 1380 kWh. I used an average of 1026 kWh/month, for a (projected) yearly total of about 12300 kWh/year. This is a monthly cost of $118, yearly $1416 at my rate of $0.115/kWh, not including base fees of about $15. The majority of this use is air conditioning, even set at high temperatures it runs almost constantly in the hot months, made more so by my computers, which make up the other bulk of the cost (about 400W constantly for the computers.) Also to be considered is hot water, which is probably a tenth, and refrigeration.
Executive summary: I could and should probably cut back some on my usage, but at the current rates, it's not really pressing enough for me to care, and the apartment is rented, so it's not like I can do anything about the inefficient air conditioning, poor insulation, or lack of afternoon shade in the summer.