Energy Use Intensity Proposed (EUIp) describes the energy use for a project based on modeled source energy. Being source-based, rather than site-based, it includes energy generation and transmission losses and is therefore a better prediction of the total energy footprint of your project than pEUI. EUIp equals the source kBtu per year divided by the project’s square footage.
[EUIp = source kBtu/sf-yr]
This is the reference data currently required by the International Green Construction Code.
Source: An Architect’s Guide to Integrating Energy Modeling in the Design Process. 2012. The American Institute of Architects.