The supermarket giants will face a new rival in discount petrol market when convenience store giant 7-Eleven enters the WA market for the first time.
Australian master franchise holder 7-Eleven Stores said fuel outlets would be among the 11 stores projected to open in the State over the coming year.
The playing field in petrol sales has been levelled somewhat this year by Coles and Woolworths agreeing with the competition regulator to cap discount dockets at 4 cents a litre.
7-Eleven Stores chief executive Warren Wilmot there were plans for as many as 75 stores to open over the next five years.
The company valued WA's convenience market at about $270 million.
"Economic and population growth in Western Australia, and boosted demand for convenience stores in the State, has helped make this expansion a reality," Mr Wilmot said.
7-Eleven Stores is a private company owned by the Wither/Barlow family.