wow thats a big jump. Before I started my current grow my bill was around $90/month. Only $45 is actual usage though, the rest is taxes and fees. With the 400w hps,filter/fan,an osilating fan a tall stand up fan and two ac's going my bill only went up to $110/month with about $65 being for usage. I only run my lights at night though, I never run both my ac's at the same time and I switched all my bulbs in the house to cfl's. I also started using my stove/oven less, taking shorter showers and turning my computer off at night. Just tweak some things around your house, if your running your light 24/7 I would switch it to 18/6 and you will see that bill drop drastically.