I would not trust the details from your utility company. Have a look at http://www.quora.com/What-is-the-average-energy-consumption-kilowatt-hours-per-household-in-the-U-S-and-in-Canada http://www.eia.gov/cneaf/electricity/esr/table5.html Based on these, the average for US/Residential is 920kWh/month with Maine and Cali being the lowest states at 521 and 587 kWh/month. Based on your electricity graph, it appears that your are averaging just under 500kWh/month. Based on that you are already winning.