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LEVEL 1 AUDIT A Level 1 audit, sometimes called overview, allows the overall energy consumption of the site to be evaluated, to determine whether energy use is reasonable or excessive. It provides initial benchmarks of the site so that the effect of energy measures can be tracked and evaluated. It may be in the form of desktop study; however the information given to, or gathered by, the auditor needs to be sufficient to enable the overall level of efficiency of the site to be determined. - NOTE: A Level 1 audit is expected to give an overview, which provides rough orders of savings and costs. Accuracy of figures would generally be within ±40%.
LEVEL 2 AUDIT The Level 2 audit identifies the sources of energy to a site, the amount of energy supplied, and what the energy is used for. It also identifies areas where savings may be made, recommends measures to be taken, and provides a statement of costs and potential savings. LEVEL 3 AUDIT The Level 3 audit provides a detailed analysis of energy usage, the savings that can be made, and the cost of achieving those savings. It may cover the whole site or may concentrate on an individual item, such as a single industrial process or one of the services. The auditor may often employ a specialist to carry out specific parts of an audit or may need to install local metering and logging. The report from a Level 3 audit often forms the justification for substantial investments by the owner or an energy performance contractor. Detailed economic analysis with appropriate level of accuracy is required. - NOTE: A Level 3 audit is expected to provide a firm estimate of savings and costs. Accuracy of figures would be within +10% for cost and -10% for benefits.
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