Gas bill analyser
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The comparison
Compare gas suppliers in Perth
Western Australia has a deregulated gas market, so gas suppliers (also called retailers or providers) compete for your business. Electricity in the SWIS is Synergy-only, but gas is contestable. Enter your usage to find the cheapest plan for your home, or take the figures off your last bill with the gas bill analyser.
Updated September 2026 from the recorded retailer dataset.
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The rates
What Perth households pay per unit of gas
Every WA gas plan is built from two numbers: a fixed supply charge you pay each day whether you burn gas or not, and a usage rate for each megajoule you do burn. Both are quoted including GST.
Supply charge
Compiling per day
Charged whether an appliance runs or not, which works out to a set amount a year before you burn a single megajoule.
Usage rate
Compiling per megajoule
The rate charged for each megajoule you burn.
Retailers often quote gas in units rather than megajoules. One unit is 3.6 MJ, so divide a cents-per-unit rate by 3.6 before setting it against the range above. Your bill carries both the daily supply charge and the usage rate.
Ranges cover the plans in the comparison above, recorded from published retailer pricing or marked as estimates where a rate has not been independently verified, and updated September 2026.
The market
Gas suppliers and providers in Perth
Every WA gas supplier delivers through the same network, so plans are directly comparable: what differ are the rates, charges, and discounts each one sets.
One sentence deserves its own paragraph: a percentage discount means nothing until you know what it's a percentage of. A big discount off high base rates routinely costs more than a small discount off low ones. This is not an accident of marketing — which is why the comparison above ranks plans by estimated annual cost at your usage, never by headline discount.
WA gas deregulation
- WA residential gas was deregulated in 2013, giving you the freedom to choose your retailer.
- All retailers use the same ATCO gas distribution network, so supply reliability is the same regardless of retailer.
- Switching is free and takes about 20 business days with no interruption to your gas supply.
How to find the cheapest plan for your usage
- High usage? Look for the lowest usage rate (c/MJ) even if the supply charge is higher.
- Low usage? A lower supply charge matters more since it is a larger share of your bill.
- Pay-on-time discounts can save 8-15% but only if you consistently pay before the due date.
- Compare on annual usage, not last month's. Perth gas bills are seasonal — a plan compared on a summer bill can rank differently over a full winter of heating.
- There is no single "cheapest gas in Perth" — tiered rates mean the cheapest supplier for a two-person flat and a six-person house with gas heating can be different companies. There's a cheapest at your usage.
Can you get electricity and gas from one WA retailer?
Not as a choice you can shop. Residential electricity on the main WA grid, the SWIS, comes from Synergy and only Synergy, so there is no second electricity retailer to bundle a gas plan with. A dual-fuel comparison here would be comparing one option against itself.
What a WA household can choose is the gas retailer above, the Synergy tariff the home sits on, and whether solar covers part of the electricity. Those three move the bill; a bundle discount is not on the table.
Common questions
Gas suppliers in Perth: common questions
The questions Perth households ask most about choosing a gas supplier, answered from the recorded plan set above rather than any single retailer's marketing.
Who are the gas suppliers in Perth?
Perth's networked gas market has several licensed retailers competing for residential customers, including Alinta, Kleenheat, AGL and Origin. The comparison above ranks every plan whose rates we can independently verify; where a retailer's rates are still unverified estimates, we withhold them rather than rank them as fact. Every retailer delivers through the same ATCO distribution network, so supply reliability is identical no matter which you pick, what differs is the usage rate, daily supply charge and discount terms each sets.
Can you choose your own gas provider in Perth?
Yes. WA residential gas is deregulated, so any home connected to the ATCO network can choose its gas retailer and switch for free, with no interruption to supply. Electricity works differently: on the main WA grid, the SWIS, Synergy is the only residential retailer, so gas is the one energy bill a Perth household can actually shop.
Who has the cheapest gas in Perth?
There is no single cheapest supplier. Because most plans put a tiered per-megajoule usage rate on top of a fixed daily supply charge, the cheapest plan for a low-use flat and the cheapest for a high-use home with gas ducted heating can be different retailers. The comparison above ranks every plan by estimated annual cost at your usage, which is the only figure that answers this for your household rather than in general.
How much does gas supply cost in Perth?
Every WA gas plan is built from two numbers: a fixed daily supply charge you pay whether you burn gas or not, and a usage rate for each megajoule you do. The rates section above shows the current range of both across the plans in the comparison; enter your annual usage to see the estimated yearly total for each supplier side by side.
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Information on this page is current as of September 2026 and is provided for general guidance only. We record rates from published retailer pricing and mark estimates where a rate has not been independently verified. There is no automatic feed, and rates can move before we recheck them. Please verify details with your retailer before making decisions.