What is an MPAN?
An MPAN is the number that identifies the specific electricity supply point for your home. To the expert eye, it contains some important information about your supply.
Your MPAN is separate to the account number or customer number that your energy supplier might give you. It’s not connected to your energy account, but to the actual energy supply at your property. This means it should always stay the same, even if you switch suppliers.
It’s sometimes also known as your “supply number”, or even as an “S number”. It usually starts with the letter S.
It’s a 21-digit number, which you should be able to see on your electricity bills. Within those 21 numbers are several smaller numbers that contain different pieces of information.

For example, your MPAN contains a 2-digit Distributor ID. These 2 numbers show which distribution system operator (a company that distributes energy to homes) your energy supply is connected to.