Abstract: The invention provides a method of automatically attributing energy and Renewable Energy Credits (RECs) to contractual and market obligations. The input of energy and RECs will automatically fit into existing data models, allowing immediate attribution upon upload. The invention will immediately calculate the energy balance of the input, accounting for such factors as resource generation, energy inputs, native load, station service, and obligations. Users can specify numerous energy and REC sources to be attributed simultaneously, such attribution happening according to either system or user-defined attribution policies. The invention allows users to manipulate the data to best facilitate use of their RECs, displaying REC positions over user-specified periods of time.