An energy audit is an inspection, survey and analysis of energy flows for energy conservation in a building, process or system. The purpose of conducting an energy audit is to reduce the amount of energy input into the system 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.
During the last several decades, the demand for commercial and industrial energy audits has increased substantially in efforts to lower increasingly expensive energy costs and to adjust to the growing trends toward a sustainable future.
The term energy audit is commonly used to describe a broad spectrum of energy studies ranging from a quick walk-through of a facility to identify major problem areas to a comprehensive analysis of the implications of alternative energy efficiency measures.