If you have recently moved into your home, you may be having difficulties in knowing who supplies your premises with energy.

Gas - THis service is provided by Xoserve Ltd.
If your gas is supplied through the national gas network, The thing that identifies your gas supply is the meter point number, you can find this out and also who supplies your home by phoning the national Meter Number Helpline on 0870 608 1524.
If you need to identify the gas network to which you are connected contact the Gas Network Identity Line: 0870 1600229.
Electricity
This is more complicated because there are 14 distribution network licences for elctricity distribution / generatation, but there are many more suppliers of electricity.
In addition there are as at March 2010 also six licenced Independent Distribution Network Operators, who tend to provide extensions to the existing licenced networks. An application is currently being considered from UK Utilities (Electricity) Ltd.

To find out who supplies you however, you must contact the distributor for your area, who should be able to tell you your Mpan number and who currently charges for the elctricity for your home. The Mpan number comprises of two lines of numbers beginning with a capital "S" the generators' identity is denoted by the first two digits of the second line of that number.
The table below should help you find the correct information:-

Supply Area                                                                                                                            Distributor Identifier          Contact Number

Even if you do not know how much energy you use we can still help you find a good deal. At Step 2 we ask for your consumption details. If you select "No details handy" key questions are then asked about your domestic circumstances which can enable an estimate to be made of to the best plan for your household.