Frequently Asked Questions


Energy management means systematic attention to energy with the objective of continually improving the energy performance of your organization and maintaining these achieved improvements. It ensures that your organization continually passes through the cycle of making policy (including evaluation of objectives), planning actions, implementing actions and checking results, reviewing progress and updating policy and objectives, as required.

Energy management systems and standards provide a proven tools and best-practice methodology to integrate energy efficiency in industry corporate culture and daily management. Energy management system (EnMS) standards can drive and provide the framework needed for the organizational and individual behavioural change that is required to effecting sustainable and continual improving energy efficiency in industry; the behavioural change needed to go beyond the technology, equipment and stand-alone project approach to energy efficiency that is currently mainstreamed in industry as well as in the service market.

Energy use in industry is much more related to operational practices than in the commercial and residential sectors. An industrial facility may change production volumes or schedules and/or the type of product manufactured many times during the useful life of the factory. The energy-using systems designed to support these production patterns may be relatively energy ef?cient under the initial production design conditions but become typically signi?cantly less so as production patterns change.
The presence of energy-ef?cient components in industrial systems, while are important, provides no assurance that energy savings will be attained if the system of which the components are part is not properly designed and operated. Energy ef?cient components may bring about efficiency gains in the range of 2 to 5 per cent, but systems optimization measures can attain average ef?ciency gains of 20 to 30 per cent with a payback period of less than two years.

UNIDO Energy Management System (EnMS) uses 6 keys concept as:

  • Commitment (Roles and Responsibilities)
  • Significant Energy Users (SEUs)
  • Energy Performance Indicators (EnPIs)
  • Opportunities List
  • Operational Control
  • Review

Energy Baseline is reference point for measuring energy performance improvements. At the simplest level the baseline could be the total amount of electricity and other fuels used in the year ending before EnMS is implemented. Energy Baseline is the initial energy performance against which you will measure future performance. Typically, Energy Baseline is the energy performance from the previous year and current year performance is regularly compared against it.

The overall purpose of the energy management system is to improve energy performance and to continually improve this performance. One simple EnPI is the annualised view of energy usage of plant/organization. Depending on your measurement and metering capabilities you could have a daily annualised trend (i.e. each day add together the previous 365 days of usage) of each significant use, e.g. total electricity, boiler fuel, compressed air electricity, refrigeration electricity, etc. Another example is a simple ratio of consumed energy to produce a unit output, i.e kWh/ton and it may lead to mis interpretation due to not taking account for driver or variable for energy variation. The best method for EnPI uses regression analysis of energy usage against its driver(s). It establishes relationship between energy consumptions and appropriate driving factors.

Significant Energy Usage (SEUs) are where most of the organizations’ energy is being used. It may be Processes, systems, equipment with high potential to improve in plant and focus attention should be exercised on them.

In order to identify your significant energy users (SEUs), you need to know how much energy each process or system uses. In an ideal world you will have energy submeters fitted to all large energy users and can then simply use these meters to quantify the consumption of each use. In reality, few or none of your uses will be sub-metered. In that case you need a way of estimating their consumption. You need to carry out this activity for each energy source, i.e. electricity and each fuel type. In some cases, it may be more appreciated to think in terms of processes or systems rather than pieces of equipment.

To improve your energy performance, it is necessary to understand how and why you currently consume energy, and to identify where opportunities to improve exist. The energy review helps you to establish consumption of each of your energy sources, consumption trends, energy performance, and to identify opportunities to improve performance.

In setting objectives, you consider what you have learned about your energy use, its drivers and the potential opportunities you have identified during the earlier steps of planning. Objectives tend to be long term and less specific than targets. An example of an objective might be to improve the efficiency of your steam system by 10 percent over the next three years. Targets should support the achievement of objectives, i.e. each objective will probably have a number of targets associated with it. Target must be specific, measurable, achievable, relevant and timed.

For understanding and evaluating any industrial utility system, the key to cost-effectiveness is to take a “Systems Approach”. For a Systems Approach, the user needs to consider the whole steam system rather than investigate just a single component.

Steam System Optimization (SSO) approach are:

  • Establish current system conditions, operating parameters, and system energy use
  • Investigate how the total system presently operates
  • Identify potential areas where system operation can be improved
  • Analyse the impacts of potential improvements to the plant system
  • Implement system improvements that meet plant operational and financial criteria
  • Continue to monitor overall system performance

Actions or designs that result in closely matching the capability of a compressed air system with the real needs of the enterprise process in the most energy efficient manner possible. Compressed Air System Optimization (CASO) includes:

  • Understand compressed air point of use as it supports critical plant production functions
  • Correct existing poor performing applications and those that upset system operation
  • Eliminate wasteful practices, leaks, artificial demand, and inappropriate use
  • Create and maintain an energy balance between supply and demand