The basis of the adapted CBEO process is the "switching point," the location along a building energy optimization curve when additional energy efficiency curve and the straight line of renewable energy generation.
The first step of the CBEO process is to set an economic performance benchmark for the optimization process, typically the return on investment (ROI) or net present value per kilowatt-hour (NPV/kWh) of the anticipated onsite renewable energy technology.
Compared to many common industry practices, the CBEO process accounts for dependencies between EEMs much more comprehensively.
It is helpful for project teams using the CBEO process to adopt high energy-efficiency goals.
The major drawback of the CBEO process is that it requires relatively sophisticated knowledge of building energy use patterns to achieve an accurate optimization.
These goals and commitments laid the groundwork for use of the CBEO process to cost-optimize the various efficiency options in comparison to photovoltaics.
The CBEO process produced performance targets that were adopted and helped select appropriate EEMs.
The CBEO process relies on production of both energy and cost information early in design: during concept and schematic design.