All gas meters have a meter number that matches the meter number on your bill. 

Victorian gas meter numbers usually have four numbers and two letters e.g. 1234AB.

If your meter has digits or dials that are red they can be ignored. They are used for testing or to represent decimal places. If your gas meter is a metric or odometer meter (one with digits instead of dials), read all the digits on the display from left to right including any leading zeros.

The National Meter Identifier (NMI) is a unique number assigned to every connection to the national electricity network. This number helps to identify your supply address, the meters and meter types at your connected address, and ensures that you're billed for the correct amount of energy. So, if you're planning to switch energy retailers, having your NMI handy will make the transition smoother.

If you live in Victoria, Queensland, or South Australia, your gas meter number is called the Meter Identification Reference Number (MIRN). This number can be found on page two of your gas bill or on your gas meter itself. Similarly, if you live in New South Wales, your gas meter number is called the Delivery Point Identifier (DPI), which can also be found on page two of your gas bill.

Why do these meter identification numbers matter? Well, for one, they ensure that you're billed accurately for the energy you use. They also help energy companies monitor energy consumption patterns, which can lead to more efficient energy use and cost savings. Sometimes when you're querying your energy provider or trying to make a change to your connection, you may need quote your meter identification number.

In summary, understanding your energy meter identification numbers is crucial for accurate billing and energy usage tracking. So, if you're not sure what your NMI, MIRN, or DPI is, check your energy bill or gas meter, and make sure to keep these numbers handy for future reference.