We are on tier 4 with PG&E so we pay $0.38/KwH which is insane. Our bill is about $560/mo with the heated snake room, and 2 enclosures outside of the room for QT. That also includes a 135g fish tank running an FX5, two 300w heaters, and a 50g sump with return pump, a 90g fish tank with 300w heater and 2 filters, and also a 20g baby red ear slider tank, AND two beardie enclosures with UV bulbs and heat lamps.
We just got a new HVAC unit and a gas clothes dryer, and that helped out a ton. Bill was over $1200/mo.
I like my Dubstep to go Wop Wop Wop Wop