Cheapest gas plan in South Australia
As of 2026-11-08, the cheapest published gas plan in South Australia for a household using 20,000 MJ a year is Alinta Energy's HomeDeal Flow - Gas at an estimated $93 a month, on the AGN SA Metro gas network.
South Australia has 5 gas distribution zones in the regulator's listings and the price depends on the zone: the cheapest plan is $93 a month on AGN SA Metro and $103 on AGN Whyalla. Figures are OpenStream's estimates from the supply and usage rates each retailer publishes to the Australian Energy Regulator, at the stated annual usage, GST as published and conditional discounts excluded; they are not retailer quotes.
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Cheapest first
- AGN SA Metro gas zone (e.g. postcode 5000): cheapest Alinta Energy HomeDeal Flow - Gas at $93 a month; median $125; 72 plans from 9 retailers.
- AGN Mount Gambier gas zone (e.g. postcode 5000): cheapest Globird Energy FULLHOUSE Residential(AGN SA)-AGN SA at $103 a month; median $131; 42 plans from 4 retailers.
- AGN Port Pirie gas zone (e.g. postcode 5000): cheapest Globird Energy FULLHOUSE Residential(AGN SA)-AGN SA at $103 a month; median $131; 42 plans from 4 retailers.
- AGN Riverland/Murray Bridge gas zone (e.g. postcode 5000): cheapest Globird Energy FULLHOUSE Residential(AGN SA)-AGN SA at $103 a month; median $131; 42 plans from 4 retailers.
- AGN Whyalla gas zone (e.g. postcode 5000): cheapest Globird Energy FULLHOUSE Residential(AGN SA)-AGN SA at $103 a month; median $131; 42 plans from 4 retailers.
How to read this
Every figure is OpenStream's estimate, not a retailer quote: the supply and usage rates each retailer publishes to the Australian Energy Regulator (via Energy Made Easy), applied to the stated annual usage, GST as published, conditional discounts excluded. Prices vary by distribution network, not postcode, so the network page is the record; it links every plan to its regulator entry and keeps a nightly history. Demand-priced, variable-priced and solar-only plans are left out because they have no single honest figure. Errors are possible - check the cited sources. Full method: methodology. Machine-readable: this answer as JSON, MCP, llms.txt.
Related: Check your gas bill against every published plan · Cheapest electricity plan in South Australia · Electricity and gas for postcode 5000 (AGN SA Metro) · Electricity and gas for postcode 5000 (AGN Mount Gambier) · Electricity and gas for postcode 5000 (AGN Port Pirie) · Electricity and gas for postcode 5000 (AGN Riverland/Murray Bridge) · All answers
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