A method of monitoring power usage includes 1) accessing power usage data for power distribution unit infeeds of a plurality of power distribution units; 2) accessing stored circuit descriptions describing interconnections of the power distribution unit infeeds to a number of power feed circuits; 3) transforming the plurality of power distribution units into a power usage monitor for monitoring power usage of the power feed circuits by aggregating at least some of the power usage data based on the interconnections of the power distribution unit infeeds to the number of power feed circuits; and 4) outputting representations of the aggregated power usage data.
