Energy Terminology

Below is a list of some of the Energy Terminology.

Base Load Analysis

A means of analysing the minimum amount of energy delivered or required over a given period of time at a steady rate. It generally refers to the energy load when the normal activity of the entity is not being carried out, e.g. in industry, outside of production hours. An energy data set is thus derived over a defined period of time to represent the behaviour of a particular load within a system, e.g. a building or process.

CUSUM (Cumulative sum)

A technique for analysing energy data that uses the difference between the base line (expected or standard consumption) and the actual consumption over the base line period of time.

Data Mining

A technique for extracting patterns from a large collection of data in order to derive previously unknown and potentially useful information.

Energy Audit

A systematic, independent and documented process for obtaining evidence on energy consumption, conservation and efficiency, and evaluating it objectively to determine the extent to which defined criteria are fulfilled.

Energy Intensity

The ratio of energy consumption to a measure of the activity carried out by an entity, e.g., production levels, total floor space, number of employees, financial turnover etc. Energy consumption related to production levels is also referred to as ‘specific consumption’.

Energy Mapping

This generally refers to a dis-aggregation of energy consumption (MWh/year) into its constituent end-uses. For example, mapping of electricity may consist of a disaggregation of electricity consumption into lighting, HVAC, compressed air etc.

Energy Requirement

The minimum amount of energy required to achieve a desired output. The concept relates to the issue of why a particular amount of energy is being used, and whether the output can be delivered in a different way that requires using less or no energy.

Life Cycle Costing

The total cost associated with the purchase and operation of a product, service or other item. Such costs will include energy and maintenance costs, but exclude costs associated with disposal. Life cycle costing is sometimes referred to as the "Total Cost of Ownership" (TCO).


A process intended to assess or determine the actual values and variations in energy usage, based on procedures of systematic, periodic or spot surveillance, inspection, sampling, measurement or other assessment methods, intended to provide information about energy usage.


A process of modifying energy data in order to deal with influencing factors. Depending on the activity, influencing factors could include, the number of machine hours for a product, product weight, external temperatures etc. Normalisation facilitates comparison, benchmarking etc.

Predictive Maintenance

Maintenance based on analysis of the condition of an item or facility that checks if it is operating as required, and if not, corrective action is taken.

Preventative Maintenance

Maintenance actions performed on the basis of a set time or run-time interval.

Regression Analysis

A technique for analysing energy data that analyses the association between one (dependent) variable and one or more other (independent) variables.