Since the department plans to call the bids this year, the minister said he doubts if many potential bidders will join, given the low global demand of oil and low price of crude oil.
The minister believes it will be better to launch the bids once the global price of oil picks up, the source added.
The department had initially planned to announce the bid in April this year.
Thailand has not put petrol-related concessions up for bidding for the past 13 years.