Abstract: An energy information system and sub-measurement board for use therewith allows an energy information service provider to measure energy usage at a customer location. The sub-measurement board is connected to an energy distribution panel located at the customer location and measures energy usage of individual circuits of the distribution panel. The sub-measurement board outputs a load profile of the energy usage and transmits the load profile to the energy information service provider via a wide area network (WAN). The load profile is processed by the energy service provider and posted on a server for access by the customer. The sub-measurement board is capable of receiving three three-phase voltages and nine single-phase currents. The voltages and currents are input into a microprocessor circuit which compares the currents one at a time to the voltages to match the current with the voltage of the same individual circuit of the distribution panel.