An energy audit is an inspection, survey and analysis of energy flows, for energy conservation in a building, process or system to reduce the amount of energy input into the system without negatively affecting the output(s). In commercial and industrial sites, an energy audit is the first step in identifying opportunities to reduce energy expense and carbon footprints.

As we are professional provider of lighting system so we focus on energy audit based on lighting systems consumption.

Energy Audit is based on below principle:The analysis of sites and utility data, including study of the installed equipment and analysis of energy bills;The survey of the real operating conditions;The understanding of the sitebehavior and of the interactions with weather, occupancy and operating schedules;The selection and the evaluation of energy conservation measures;The estimation of energy saving potential;The identification of client concerns and needs.Energy Audit performs in below levels:

Level 0 – Benchmarking: This first analysis consists in a preliminary analysis based on the analysis of the historic utility use and costs and the comparison of the performances of the buildings to those of similar buildings. This benchmarking of the studied installation allows determining if further analysis is required;

Level I – Walk-through audit: Preliminary analysis made to assess sites energy efficiency to identify not only simple and low-cost improvements but also a list of energy conservation measures to orient the future detailed audit. This inspection is based on visual verifications, study of installed equipment and operating data and detailed analysis of recorded energy consumption collected during the benchmarking phase;

Level II – Detailed/General energy audit: Based on the results of the pre-audit, this type of energy audit consists in energy use survey in order to provide a comprehensive analysis of the studied installation, a more detailed analysis of the facility, a breakdown of the energy use and a first quantitative evaluation of selected utilities to correct the defects or improve the existing installation. This level of analysis can involve advanced on-site measurements and sophisticatedcomputer based simulation tools to evaluate precisely the selected energy retrofits;

Level III – Investment-Grade Audit: In most corporate settings, upgrades to a facility's energy infrastructure must compete for capital funding with non-energy-related investments. Both energy and non-energy investments are rated on a single set of financial criteria that generally stress the expected return on investment. The projected operating savings from the implementation of energy projects must be developed such that they provide a high level of confidence. In fact, investors often demand guaranteed savings. The investment-grade audit expands on the detailed audit described above and relies on a complete engineering study in order to detail technical and economic issues necessary to justify the investment related to the transformations.