That is a LOT of energy. But, there's no way to tell without more info. What do you have that is normally turned on? If your place is lit up like a stadium, the a/c unit is old and inefficient, you have an old refrigerator and maybe a couple of freezers, or there's some heating appliance on while you're trying to a/c the place, maybe. Do you have a elecric plug-in car? Does someone have something plugged into your external receptacles?
One certain way to verify someone is not stealing power from your meter is to turn your main breaker off, then look at the meter to see if it is still moving. If it is, call the police and the electrical company!