Identifying device state changes using power data and network data

A system for determining states of devices in a building includes an electrical main, an electrical panel that distributes power to the devices, a power meter that measures power consumed by the devices from the electrical main, and a first sensor configured to measure an electrical property of the electrical main. The system further includes a computer configured to determine a state of a first device in the building by processing a first power event in a power monitoring signal, obtained from the first sensor, to generate a score for each of a plurality of power models, and to select the state of the first device using the scores. The computer is further configured to receive a first network packet transmitted by a second device in the building; determine that the first network packet was sent by the second device; and select the state of the second device.