Oncor has been testing smart meters in part by monitoring several several homes with side-by-side smart meter/standard meter pairs. (See week four results from Killeen, Texas; week four results from Temple, Texas; week four results from the DFW area will be posted tomorrow, April 7, assuming Oncor sticks with their schedule.) So far it looks like the smart meters and standard meters are keeping it close, with most of the meters no more than 4 or 5 kwh’s apart after four weeks.
One pair of meters in the Temple test is reported at 12 kwh’s apart, a difference of about $1.60 on a monthly bill, but the older meter is the one with the higher reading.
What? You don’t trust Oncor? Well they are posting photos online each week from the side-by-side meters. (Which won’t convince any skeptics, but will serve to document the historical moment. Years from now some digital artist will be inspired to remix these images into a work of art.)