How a gas bill is priced

A gas plan in the regulators' feeds has a supply charge in cents per day and usage charges in cents per megajoule, usually in blocks: the first so many megajoules a day or a period at one rate, the next block at another. The estimate above is 365 days of supply plus 20,000 MJ passed through the plan's blocks, GST as published, conditional discounts excluded. Gas zones follow the distribution network, and in Victoria some networks price by sub-zone, which the plan names.

How much gas a household uses

The AER's benchmarks give gas in megajoules per season by state and household size. A two-person household in New South Wales: 16,945 MJ a year; A two-person household in Queensland: 6,262 MJ a year; A two-person household in Victoria: 50,462 MJ a year; A two-person household in South Australia: 14,669 MJ a year. A home with gas hot water and heating sits above a home with a cooktop only; the megajoules on your own bill are the figure to price on.

Comparing on your own bill

The bill check prices every published gas plan in your postcode's zone at the megajoules on your bill, alongside electricity: check your bill.

Questions this guide answers

What is the cheapest gas plan in New South Wales?

Origin Energy Origin Affinity Variable ePlus Ongoing - One Big Switch at an estimated $89 a month at 20,000 MJ a year in the AGN Adelong, Gundagai and Tumut zone, the cheapest of 23 priced plans, read 8 November 2026.

How is gas usage measured?

In megajoules (MJ). Plans charge a daily supply rate plus cents per megajoule in blocks, as published to the regulator.

How much gas does a two-person household use?

16,945 MJ a year in New South Wales, 6,262 MJ a year in Queensland, 50,462 MJ a year in Victoria, 14,669 MJ a year in South Australia (AER benchmark).