Energy Audits are basically two types. First one is Walk-through/preliminary energy audit and the second one is Detailed audit. Walk-through/preliminary Energy Audit is a process used to establish an overall picture of the potential of energy savings through visual inspection of the premise including air conditioning system, lighting, metering, building automation, building maintenance and other factors affecting energy consumption of the building. References to the records of equipment ratings, technical catalogues, operation and maintenance (O&M) manuals that are readily available will be very helpful to quickly determine whether equipment or systems are operating efficiently. Calculation, usually simple in nature, should be done to quantify the savings achievable from implementation of the identified ECMs.

The walk-through/preliminary energy audit usually is carried out in one or two days by either REEM alone or with a team, depending on the size, complexity of the building and the scope of the audit. Usually, simple instruments such as a clamp amp meter, thermometer, hygrometer (humidity meter) and lux meter will serve the purpose.

Detailed Energy Audit involves in-depth investigations into how the energy is currently being consumed, current performance of the existing systems and identification of various potential ECMs. It also gives the estimated cost and simple payback periods for all recommended ECMs.

The detailed energy audit involves the following four (4) main processes:

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