That calculater is off, or com ed is cheaper here. My total bill averages $180. I have 8 iwaki pumps, 4 mags, a dozen powerheads, enough heaters to keep 500 gallons warm, 2-400w MH and a 250mh, plus a bunch of pc's. I'll see if I can find the equation my accountant gave me for my taxes. That might give a differant reading. Before we go that far though how much is a killawatt? I'm paying .08275. Have no idea if that is cheap or not.