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Since the voltage is known and constant, you only need to measure the current and time.
bmcculla said:Russlk: i don't think you can make the assumption that the voltage is constant. I think you can only expect +-10%. My work is on the end of a long circuit and our voltage is all over the place.
stevez said:The meters that are normally used in residential applications where I live have a rotating element that has a light background with several black markings on the periphery of the element. It would seem that an optical means of counting the rotations could provide the information you need. The meter is owned by the utility so the sensor would have to look thru the glass enclosure. While this might be a bit of a challenge it certainly presents less of an electrocution risk and should correlate well with utility bills.