Walk Through and Detailed Energy Audit

Energy Audit is defined as “the verification, monitoring and analysis of use of energy including submission of technical report containing recommendations for improving energy efficiency with cost benefit analysis and an action plan to reduce energy consumption”.

We carry out energy audit to establish and quantify the cost of the various energy‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌ inputs and consumption flows within an organization over a given period. The primary objectives of energy audit are to identify and evaluate opportunities to reduce energy consumption per unit of product output and reduce operating costs through energy conservation and planning. Energy audit provides a “bench-mark" for managing energy in the organization and also provides the basis for planning a more effective use of energy throughout the organization. We carryout Preliminary Audit/walk through energy audit, Detailed Audit, Investment-Grade Energy Audit, Baseline Energy Audit.

Preliminary Energy Audit

The Preliminary Energy Audit focuses on the major energy suppliers and demands usually accounting for approximately 70% of total energy. It is essentially a preliminary data gathering and analysis effort. It uses only available data and is completed with limited diagnostic instruments. The PEA is conducted in a very short time frame i.e. 1-3 days during which the energy auditor relies on his experience together with all the relevant written, oral visual information that can lead to a quick diagnosis of the plant energy situation. The PEA focuses on the identification of obvious sources of energy wastage's. The typical out put of a PEA is a set of recommendations and immediate low cost action that can be taken up by the department head.


Preliminary energy audit is a relatively quick exercise to:


  • Establish energy consumption in the organization

  • Estimate the scope for saving

  • Identify the most likely (and the easiest areas for attention

  • Identify immediate (especially no-/low-cost) improvements/ savings

  • Set a 'reference point'

  • Identify areas for more detailed study/measurement

  • Preliminary energy audit uses existing, or easily obtained data 


Detailed Energy Audit

The detailed audit goes beyond quantitative estimates of costs and savings. It includes engineering recommendations and well-defined project, giving due priorities. Approximately 95% of all energy is accounted for during the detailed audit. The detailed energy audit is conducted after the preliminary energy audit. Sophisticated instrumentation including flow meter, flue gas analyzer and scanner are use of compute energy efficiency.

The information to be collected during the detailed audit includes:


  1. Energy consumption by type of energy, by department, by major items of process equipment, by end-use

  2. Material balance data (raw materials, intermediate and final products, recycled materials, use of scrap or waste products, production of by-products for re-use in other industries, etc.)

  3. Energy cost and tariff data

  4. Process and material flow diagrams

  5. Generation and distribution of site services (eg.compressed air, steam).

  6. Sources of energy supply (e.g. electricity from the grid or self-generation)

  7. Potential for fuel substitution, process modifications, and the use of co-generation systems (combined heat and power generation).

  8. Energy Management procedures and energy awareness training programs within the establishment.Existing baseline information and reports are useful to get consumption pattern, production cost and productivity levels in terms of product per raw material inputs. The audit team should collect the following baseline data:-

  • Technology, processes used and equipment details

  • Capacity utilization

  • Amount & type of input materials used

  • Water consumption-Fuel Consumption

  • Electrical energy consumption

  • Steam consumption

  • Other inputs such as compressed air, cooling water etc

  • Quantity & type of wastes generated-Percentage rejection / reprocessing-Efficiencies / yield