Canstar has a page on ownership. Clicking through provides revenue for Canstar but you do not need to click, just scroll down to the table.
One bit to consider is that it is established that Australian companies will sell out to anyone if the price is right, so seeking an Australian provider could be a regular activity. Also note that ownership as a metric by itself does not equate to good prices or good service, so if and when you change be careful not to unintentionally do the equivalent of self-harm.
Thank you for the Canstar details, I shall follow that up. AlintaGas is possibly more significant for us in WA, as its origin was the WA state owned gas supply organisation, until sold in 2001, so I expect the vast majority of us in the West are still their customers, ie, Australian loyalty.
I find it strange that particularly over East, this fetish about Electricity and Gas price, whereas most household spend a far more on petrol for the many cars they have, and seldom talk about its price changes that seem far more significant. In WA we have the fantastic Fuelwatch system that no one over East seems to understand including Choice.
we included FuelWatch in our recent fuel price app comparison. Is there something in particular that you would have liked us to cover (apart from not being able to afford to travel to WA to test its accuracy) ? Do you feel it differs significantly from the other state/territory price databases, eg NSW FuelCheck, MyFuel NT ?
You asked about gas suppliers, presumably domestic. Yes, go local. Kleenheat is a pedigreed WA company owned by Wesfarmers, supplies natural gas and bottled LPG in WA and NT. Discounts for RAC members.