Energy audit is a technique used to establish pattern of energy use; identify how and where loses are occurring; and suggest appropriate economically viable engineering solutions to enhance energy efficiency in the system studied.
Instrumented and diagnostic energy audits (with aims ranging from identifying ways of conserving energy to evolution of a new blue print for the energy system) provide insight into the modes of better utilization of fossil resources and high-grade energy and exploration of renewable energy options.
The general methodology of instrumented & diagnostic energy audit consists of the following: