An MPAN (Meter Point Administration Number) is the number that identifies your electricity supply. It's sometimes referred to as a 'Supply Number' or 'S Number'. This unique meter code helps suppliers locate your home and is found on your old statements. This is a problem if you don't have an electricity bill to refer. In this case, your supplier or local distributor will be able to tell you what it is.
MPRNs (Meter Point Reference Number) are the equivalent reference for gas and will also be found on your gas bills. They have 6 to 8 digits and are sometimes also referred to as an 'M Number'. A supplier or local distributor will be able to tell you what your MPRN is if you are unable to find it.