To get a score for a design project in Portfolio Manager (or Target Finder) you are required to enter estimated annual whole-building energy use. The estimated annual energy use should be derived using a whole-building energy simulation model. The model inputs must include all intended/predicted energy use from all fuel sources (electricity, natural gas, steam, chilled water, propane, etc.).
Any calculation process that yields these contributions is acceptable. Users often conduct building energy simulations using programs such as Trace, HAP, DOE-2, and eQuest to determine the building’s energy use, and then add calculated energy requirements of other systems, such as DHW, to obtain the final values.
For more information, please see the ENERGY STAR Tips for Effective Energy Analysis of Commercial Building Designs.