Jargon buster

Our quick guide explains some of the acronyms and terms used in the energy industry.

Annual quantity: The annual quantity of gas consumed

Calorific value: A measure of the energy contained in gas. It represents the amount of heat released as the gas is burned.

Climate Change Levy: This is a levy (or tax) introduced by the Government on 1st April 2001 on the use of energy in industry, commerce and the public sector. 

DNO (Distribution Network Operator): A company that owns and maintains a network for transporting electicity. 

First (Primary) and Next (Secondary) rates: We work out some of our bills using two different price bands. These used to be called 'Primary' and 'Secondary' rates, now we call them 'First' and 'Next'. The threshold at which you switch from primary to secondary prices depends on your tariff. To work out how many units we charge at the Primary (First) unit price, we divide the threshold limit by 365 days and then multiply this by the number of days your bill covers. We charge everything you use after that at the Secondary (Next) rate.

kWh (kilowatt-hour): A kWh is the unit of energy used to measure electricity and gas bills. It shows how much energy is used over time.

MPAN (Meter Point Administration Number): The MPAN (Meter Point Administration Number) is your unique electricity reference number, and is used to identify your electricity supply.

MPR (Meter Point Reference): This is your unique gas Meter Point Reference number, and is used to identify your gas supply. Your MPR is on your gas bill, not on the meter itself.

MSN (Meter Serial Number): A number given to identify an actual meter.

OFGEM (Office of Gas & Electricity Markets): Regulator for gas & electricity businesses in Great Britain.

SSD: Supply start date.

Standing charge: A standing charge is a daily amount you pay for your gas and electricity. Standing charges are used to cover our costs, such as meter reading and maintenance and the cost of keeping you connected to the grid. The price per kWh is how much you pay for the energy you’ve used, we work this out by reading your meters.

What is a Tariff Information Label (TIL)? A Tariff Information Label (TIL) is your way of seeing at a glance how our energy products compare with other suppliers to make sure you get the best deal.

To find out more information about your tariff, please visit our new tariff search page.

When you use our TIL Search page you can compare tariffs with different benefits such as paperless billing. The results will also highlight the difference if you choose to pay by fixed monthly Direct Debit. If you pay a different way your tariff will say Other Payment Methods in the title.