1. A method, comprising: (i) collecting, at a predetermined sampling interval, data indicative of power consumption of at least one appliance of a plurality of appliances from at least one power meter, wherein a number of power meters of the at least one power meter is less than a number of outlets of a plurality of outlets coupled to the plurality of appliances; (ii) collecting, over a first time interval, data indicative of a time-stamped set of binary power states of a plurality of appliances, wherein a binary power state is an ON power state or an OFF power state; and (iii) estimating an energy consumption of at least one appliance of the plurality of appliances over the first time interval.