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Understanding energy terminology for Gas

Understanding energy terminology for Gas

This glossary list for Gas has been developed for those who work within the public sector and we envisage this guide to be easily understood by any staff undertaking energy procurement within their role.

The list uses plain English to explain the specialist words and expressions that sometimes make energy terminology hard to understand.

Other energy terminology you may be interested to view:



Automatic Meter Read – These readings can be obtained from Smart Meters, providing customers with instant and accurate data

Annual Quantity - An estimate of future gas consumption, as calculated by the distribution network.


Climate Change Levy - A government charge on commercial electricity and gas designed to encourage lower consumption and reduce greenhouse gas emissions.

Correction Factor
The correction factor is used to convert gas units into kilowatt hours (kWh). It takes into account changes in the volume of the gas based on temperature and pressure. This makes sure all customers receive the same number of kWh for each cubic meter of gas that is supplied to them. This can be found on your bill

Carbon Reduction Commitment - The scheme designed to improve the energy efficiency credentials of large organisation.

Calorific Value - This is a scientific term used to describe the amount of heat generated per volume of gas that is burned away and can be found on your bill.


Department of Energy and Climate Change - A government department created in 2008. Its purpose is to work for secure, affordable and efficient energy.


Estimated Annual Consumption

Energy supplier
An energy supplier is the company which provides your property with gas and/or electricity.


IGT (Independent Gas Transfer) Network
This is an independent company who look after a gas supply network that is not connected to the National Grid..


kWh (kilowatt hour)
This is the unit of measurement for gas and electricity consumption. The number of kWh you have used within a given period will be shown on your bill, and you will be charged for each of these units.


Liquefied Natural Gas - Gas that has been cooled and condensed into a liquid - a process that makes it easier to transport and store.


Meter Point Reference Number - Your MPRN is the unique identifying number for the gas supply at your property and is a 10 digit number

Meter Serial Number - The unique number that identifies a meter which is usually displayed on the front of most meters


National Grid
The National Grid is the company responsible for our homes receiving energy. It’s responsible for the network of transmitters and pipes around the company.


Office of Gas and Electricity Markets - An organisation established to regulate and promote competition in a deregulated energy industry.


This is the HM Revenue and Customs form that enables users to claim exemption or discount on the Climate Change Levy.


Smart meter
These digital devices take automatic readings of your energy usage and send the readings electronically to your energy company.

Standing Charge
A fixed daily charge for the energy that is being supplied to your property regardless of your consumption.

A supplier is the company who provides your gas and/or electricity


Transco plc became National Grid plc in 2005, and were the company in charge of transporting energy throughout the UK. If your gas is not transported by IGT (Independent Gas Transfer), it’s carried by the National Grid – formerly Transco.

You may be interested in our Mains gas framework (192).

If you would like to speak to a member of the Energy team please contact them on 0116 294 4142 or email