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This report uses EnergyPlus simulations of each building in the 2003 Commercial Buildings Energy Consumption Survey (CBECS) to document methods of modeling the entire U.S. commercial buildings sector (EIA 2006). 

The FEDS system allows data input to range from minimal to extremely detailed. With minimal input, FEDS can be used as a top-down, first-pass energy systems analysis and energy resource acquisition decision software model for buildings and facilities. Providing FEDS with more detailed input allows the user to generate optimized building retrofits for an entire installation and provides detailed output for each retrofit in each building set.