In this phase the aim is to understand and analyse the energy flows in a building, and understand its energy dynamics. During the energy assessment, the auditor looks for opportunities to reduce the amount of energy input into the building without negatively affecting the output(s). Beyond simply identifying the sources of energy use, an energy audit seeks to prioritize the energy uses according to the greatest to least cost effective opportunities for energy savings.
The process of conducting an energy audit can be very simple. First, the energy auditor will obtain the energy bills for a minimum of 1 year for the building. The current energy data is used to create a baseline and establish what the current energy costs are. Next the auditor conducts a room-by-room inspection of the building. During the room-by-room inspection, the auditor examines energy consuming items as well as areas that waste energy. With the new information obtained during the inspection, the auditor then calculates the current energy usage and proposed energy savings and documents the findings into a summary report.