A meter, comprising: a processor; a memory, in communication with the processor; a metrology unit, in communication with the processor, to provide voltage measurements over time; wherein the memory is configured with instructions, which when executed by the processor cause the meter to perform actions comprising: generating a first time-series of voltage-changes based at least in part on the voltage measurements over time from the metrology unit, wherein the first time-series of voltage-changes is associated with a defined time period and has a number of intervals based at least in part on a number of loads turned on or turned off during the defined time period, wherein a voltage change caused by a change in electrical load triggers an end of one interval and a start of another interval; obtaining a second time-series of voltage-changes from a second meter comprising a second metrology unit and receiving coordinates of the second meter from the second meter; determining a distance between the meter and the second meter using the coordinates; calculating a correlation between the first time-series of voltage-changes and the second time-series of voltage-changes, wherein calculating the correlation comprises: determining that the metrology unit and the second metrology unit are within a threshold distance of one another; and responsive to determining that the metrology unit and the second metrology unit are within the threshold distance, performing the calculation; comparing the calculated correlation to a first threshold to determine whether the meter and the second meter are connected to a common transformer; and comparing the calculated correlation to a second threshold to determine whether the meter and the second meter are connected to the common transformer through common wiring, wherein the second threshold is higher than the first threshold. a processor; a memory, in communication with the processor; a metrology unit, in communication with the processor, to provide voltage measurements over time; wherein the memory is configured with instructions, which when executed by the processor cause the meter to perform actions comprising: generating a first time-series of voltage-changes based at least in part on the voltage measurements over time from the metrology unit, wherein the first time-series of voltage-changes is associated with a defined time period and has a number of intervals based at least in part on a number of loads turned on or turned off during the defined time period, wherein a voltage change caused by a change in electrical load triggers an end of one interval and a start of another interval; obtaining a second time-series of voltage-changes from a second meter comprising a second metrology unit and receiving coordinates of the second meter from the second meter; determining a distance between the meter and the second meter using the coordinates; calculating a correlation between the first time-series of voltage-changes and the second time-series of voltage-changes, wherein calculating the correlation comprises: determining that the metrology unit and the second metrology unit are within a threshold distance of one another; and responsive to determining that the metrology unit and the second metrology unit are within the threshold distance, performing the calculation; comparing the calculated correlation to a first threshold to determine whether the meter and the second meter are connected to a common transformer; and comparing the calculated correlation to a second threshold to determine whether the meter and the second meter are connected to the common transformer through common wiring, wherein the second threshold is higher than the first threshold. generating a first time-series of voltage-changes based at least in part on the voltage measurements over time from the metrology unit, wherein the first time-series of voltage-changes is associated with a defined time period and has a number of intervals based at least in part on a number of loads turned on or turned off during the defined time period, wherein a voltage change caused by a change in electrical load triggers an end of one interval and a start of another interval; obtaining a second time-series of voltage-changes from a second meter comprising a second metrology unit and receiving coordinates of the second meter from the second meter; determining a distance between the meter and the second meter using the coordinates; calculating a correlation between the first time-series of voltage-changes and the second time-series of voltage-changes, wherein calculating the correlation comprises: determining that the metrology unit and the second metrology unit are within a threshold distance of one another; and responsive to determining that the metrology unit and the second metrology unit are within the threshold distance, performing the calculation; determining that the metrology unit and the second metrology unit are within a threshold distance of one another; and responsive to determining that the metrology unit and the second metrology unit are within the threshold distance, performing the calculation; comparing the calculated correlation to a first threshold to determine whether the meter and the second meter are connected to a common transformer; and comparing the calculated correlation to a second threshold to determine whether the meter and the second meter are connected to the common transformer through common wiring, wherein the second threshold is higher than the first threshold.